Power save method, access point device, and station device

[0001] The invention relates to wireless communication technology, in particular to a power saving method, an access point device (abbreviated AP) and a station device (abbreviated STA).

Background of the Invention [0002] In a multi-input communication system - multiple outputs (abbreviated MIMO), with transmission capabilities (abbreviated as TXOP) not all devices in the basic services set (abbreviated as BSS) have to receive data. Accordingly, in the wireless communication system, a power saving method is adopted to enable that the STA device that does not receive any data in the current TXOP goes into a dormant state. The STA device in snooze mode turns off its own receiver, thus limiting energy consumption.

[0003] In general, a method of saving energy for a wireless communication system is that: the AP device sends the target operation identifier to the STA device and indicates the absence of TXOP power save (abbreviated the absence of the TXOP PS). The operation objective identifier is used to indicate at least one STA device that must perform the operation. The lack of TXOP power save indication may be yes or no, wherein, if the no TXOP power save indication is no, it indicates that the STA device including the BSS may realize the power save operation in the current TXOP; if the indication of no TXOP power saving is yes, it indicates that the STA device is forbidden to perform energy saving operations in the current TXOP. An effective period indicated by the TXOP power save indication is the current TXOP, so if the STA device enters the snooze state, the STA device maintains the snooze state to the end of the given TXOP, and when that TXOP ends, the STA device is restored to the awake state. In the energy saving method of current communication standards, the absence of the TXOP TX of all frames of the same TXOP is set to the same value, and the STA device with the snooze function performs the evaluation only on the basis of the lack of the TXOP TXOP first frame. In particular, in a TXOP, after receiving the first frame, the STA device with the function of entering the snooze state judges whether power save is allowed to be performed in this TXOP based on the absence of the TXOP PS of the first frame. If it is not allowed, the referenced STA device maintains the wake-up state for the entire TXOP. If this is allowed, the device quoted evaluates whether to enter the snooze state based on the snooze state in all frames, from the first to the last frame of that TXOP.

US 2005/018624 discloses a QSTA with energy saving notifying an access point (AP) so that it works in an automatic delivery mode

- 2 energy savings (APSD), and negotiates with the AP a periodic recovery schedule and the planned start-up time. Wakeup times are synchronized with the 802.11 synchronization function (TSF). AP automatically sends frames to QSTA when it determines that QSTA is in the awake state, otherwise the frames are buffered. The AP uses a combination of the cyclic polling + access method + EDCF, in which at the beginning of each waking period, the AP sends cyclic polling to QTSA, and cyclic polling has a flag that indicates to QTSA whether the AP has buffered downlink frames for QSTA. In addition, the intermediary ARP server in the AP maintains IP / MAC bindings for the associated clients so that when the AP receives the proxy ARP request for the client, the AP may respond to the client.

[0004] It is well known that STA with the function of entering the doze state refers to that the STA supports the function of entering the doze state and the function is in the on state. STA supporting the function of entering the snooze state can activate this function in a period of time, and disable this function in a different time period; that is, the STA may have the function of snoozing over a period of time; and not have the function of going into a napping state for another period of time. Corresponding signaling in the prior art enables the STA to report to the AP about whether the STA currently has the function of entering the doze state. An existing energy saving method has been adopted, and when the indication of the lack of TXOP power saving carried over the first TXOP frame is no, it indicates that all STA devices in the BSS, that are not included in the frame operation identifier can go into a snooze state; in this case, in general, all STA devices in the BSS with the function of entering the doze state make an assessment based on the nap condition, and if the nap condition is met, the STA devices go into a dormant state. Hence, in the case of MIMO MIMO mode (abbreviated as MU-MIMO), the existing energy saving method applies only if the operation target identifier in the first TXOP frame includes all STA devices with the TXOP snooze related function, and in the In case of single user MIMO mode (abbreviated SU-MIMO), the method applies only to the case,

Summary of the Invention [0005] Embodiments of the invention provide a power saving method, an AP device and an STA device that are used to solve the disadvantages of the prior art, by extending the scope of energy saving and increasing the effect of energy saving.

[0006] An embodiment of the invention provides a method for energy saving, which includes:

- sending, via the access point device, AP, current transmission frames, TXOPs, to the station device, STA, so that when the TXOP power save indication of the current frame is allowed to save energy, the STA device determines whether to switch to the snooze state based on the result of the snooze condition evaluation, each frame including the TXOP frame energy saving indication and the TXOP power save indication value of many frames may change only once in the same TXOP;

one bit in a very high throughput signal A1, VHT-SIG-A1 (very high throughput signal), the field of each frame is an indication of TXOP power saving frame.

[0007] An embodiment of the invention provides a method for energy saving, which includes:

receiving, by the station device, STA, frames of the current transmission capability, TXOP, from the access point device, AP; and when the TXOP power save indication of the current frame is allowing power saving, determining by the STA device whether to switch to the snooze state based on the snooze condition evaluation result, each frame including the TXOP frame power save indication and the TXOP frame power saving indication value it can only change once in the same TXOP; one bit in the very high bandwidth signal A1, VHT-SIG-A1, the field of each frame is an indication of TXOP power saving frame.

[0008] An embodiment of the invention also provides an AP device that includes:

a set-up module configured to transmit an energy saving indication, TXOP, frame, where the TXOP indication of the power save indication of multiple frames may change only once in the same TXOP; and a sending module, configured to send frames for the current TXOP to the station device, STA, so that when the TXOP power save indication of the current frame is allowed to save energy, the STA determines whether to snooze in response to the snooze condition evaluation result. , each frame including a TXOP frame energy saving indication; one bit in the very high bandwidth signal A1, VHT-SIG-A1, the field of each frame is an indication of TXOP power saving frame.

[0009] An embodiment of the invention also provides an STA device wherein the STA device is a STA device with a snooze feature and includes:

an acquisition module configured to obtain multiple frames of the current transmission capability, TXOP, from the access point device, AP, each frame including a TXOP frame power save indication, and the frame TXOP power save value may change only once in the same TXOP; and a control module configured to: when the TXOP power save indication of the current frame is allowed to save energy, it determines whether to switch to the snooze state based on the evaluation of the snooze condition result;

- 4 one bit in the very high bandwidth signal A1, VHT-SIG-A1, the field of each frame is an indication of TXOP power saving frame.

[0010] An embodiment of the invention also provides a method for saving energy, comprising:

respectively obtaining, by the apparatus of the STA station, the current frame and the pre-set frame of the TXOP transmission possibility, wherein the current frame includes a further STA indication and a TXOP power save indication, and the pre-set frame includes an operation indicator;

when the TXOP power save indication of the current frame is allowed, the operation target indicator of the pre-set frame does not include an indication for that STA device and the next STA indication of the current frame is such that no STA identifier is added again later, passing through the STA device, in a napping state in which STA is STA with the function of entering a napping state;

and the STA device is an STA device with the function of entering the doze state.

[0011] An embodiment of the invention also provides an STA device in which the STA device is a STA device with the function of entering a doze state and which comprises:

an acquisition module configured to respectively obtain the current frame and a preset current frame of the TXOP transmission capacity, in which the current frame includes the indication of the next STA and the TXOP power save indication, and the pre-set frame includes the operation target identifier;

the control module configured to, when the TXOP power save indication of the current frame is allowed, the operation target identifier of the previously set frame does not include an indication for that STA device and the next STA indication of the current frame is such that no STA identifier is added again later, controlling the STA device for entering the doze state wherein the STA device is a STA device with the function of entering the doze state.

[0012] The method of saving energy includes:

setting the power save indication of the current data frame in which the energy saving indication is used to indicate that the STA receiving the current data frame is capable of allowing it to enter the power save state;

sending the current data frame in the current TXOP transmission capacity, such that the STA receiving the current data frame determines whether to snooze based on the snooze condition evaluation result, and the power save indication in at least one data frame sent before the current data frame and sent in the TXOP it is used to indicate that STA has been forbidden to realize energy saving in which the STA device is an STA device with the function of entering the state of a nap.

[0013] The access point device, with the function of entering the doze state, includes:

- a setting unit configured to set the power save indication of the current data frame in which the energy saving indication is used to indicate that the STA receiving the current data frame is capable of allowing it to enter a power save state;

a sending unit configured to send the current data frame at the current TXOP transmission opportunity, such that the STA receiving the current data frame determines whether to switch to the snooze state based on the snooze condition evaluation result in which the setting entity sets the current frame such that the energy saving indication included in at least one data frame sent before the current data frame and sent in a TXOP, it is used to indicate the prohibition of switching to a power save state.

[0014] From the technical solutions it may be known that, according to an embodiment of the invention, the TXOP power save indications of different frames in the same TXOP may be different, and only if both conditions that no STA station identifier is added again and energy saving is allowed in the current TXOP are met, then the TXPO energy save indication of the frame or the next frame indicates the allowed energy saving; only when the current TXOP power save indication indicates that energy saving is allowed, the STA evaluates the snooze condition, and determines whether to snooze on the basis of the evaluation result. Alternatively, the AP device sends another STA indication to the STA device, and when the TXOP power save indication allows, the next indication of the STA is that that no identifier of the STA station is added again later and the operation target identifier of the frame previously set does not include the identifier of that STA device, the STA device goes into a snooze state. Hence, the method does not require the operation identifier in the first TXOP frame to include all STA devices associated with the TXOP, thus extending the scope of the energy saving method and improving the efficiency of energy saving.

Brief description of the drawing [0015]

Fig. 1 is a flow diagram of a power saving mode according to the embodiment of the invention;

Fig. 2 is a flow diagram of the energy saving method according to the embodiment 2 of the invention;

Fig. 3 is a flow diagram of a power saving mode according to an embodiment of the invention;

Fig. 4 is a diagram of a sequence of operations of a power saving method according to the embodiment of the invention;

Fig. 5 is a schematic structural diagram of an AP apparatus according to an embodiment of the invention;

Fig. 6 is a schematic structural diagram of an STA device according to an embodiment of the invention;

Fig. 7 is a flow diagram of a method of saving energy according to an embodiment of the invention;

Fig. 8 is a flow diagram of a method for saving energy according to an embodiment of the invention;

Fig. 9 is a flow diagram of an energy saving method according to an embodiment of the invention;

Fig. 10 is a flow diagram of an energy saving method according to an embodiment of the invention; and

Fig. 11 is a flow diagram of a method for saving energy according to an embodiment of the invention;

DETAILED DESCRIPTION OF EMBODIMENTS [0016] When an indication of a lack of a TXOP PS indicates that power saving permission is taking place, the snooze condition used to assess whether to switch into a dormant state may include any of the three conditions or any combination thereof, and when one of the conditions is met , it is judged that the nap condition is met, in which case the STA device goes into a dormant state; when all of at least one of the conditions included in the nap condition are unfulfilled, the snooze condition is judged unfulfilled, in which case the STA device maintains the awake state.

[0017] It should also be noted that when the indication of the absence of the TXOP PS indicates that energy saving is allowed, the snooze condition used to assess whether to snooze may include any of the three conditions or any combination thereof, and when one of the conditions is met , it is judged that the nap condition is met, in which case the STA device with the function of entering the state of the nap goes into the state of napping; when all of the at least one condition included in the nap condition are unfulfilled, the snooze condition is judged unfulfilled, in which case the STA device with the snooze function maintains the awake state; if the STA device does not support the ability to go into a snooze state, the device always maintains the state of arousal, and the above snooze condition need not be evaluated. For the sake of simplifying the description of the STA in the following description, the "STA device goes into a dormant state" refers to STA with the function of entering the doze state; that is, "the STA device goes into a napping state" definitively illustrates that STA is STA with the function of switching to a napping state.

[0018] In particular in the MU-MIMO mode, the three conditions especially include the following content. Condition 1: when the operation target identifier of the previously set frame does not contain an indication for the STA device that has received the previously set frame, the STA device enters the snooze state. Condition 2: when the operation target identifier of the pre-set frame contains indications for the STA device and the indication of the stream multiplexing number corresponding to the STA is 0, the STA device goes into the doze state. Condition 3: when the operation target identifier of the previously set frame contains an indication for the STA device and the STA receives more data frames whose data bit indications are 0, the STA device enters the snooze state. In SU-7 MIMO mode, three conditions especially include the following content. Condition 1: when the partial identifier of the association (abbreviated AID) indicated in the operation purpose identifier of the previously set frame is different from the partial AID of the STU that has received the previously set frame, the STA device enters the snooze state. Condition 2: when the partial AID indicated in the operation target identifier of the previously set frame is the same as the partial AID of the STA device, but the current frame is not sent to the STA, the STA device enters the snooze state. Condition 3: when the operation target identifier of the previously set frame includes an indication for the STA device and the STA device receives more data frames whose data bit indications are 0, the STA device enters the doze state. which has picked up the previously set frame, the STA device goes into a snooze state. Condition 2: when the partial AID indicated in the operation target identifier of the previously set frame is the same as the partial AID of the STA device, but the current frame is not sent to the STA, the STA device enters the snooze state. Condition 3: when the operation target identifier of the previously set frame includes an indication for the STA device and the STA device receives more data frames whose data bit indications are 0, the STA device enters the doze state. which has picked up the previously set frame, the STA device goes into a snooze state. Condition 2: when the partial AID indicated in the operation target identifier of the previously set frame is the same as the partial AID of the STA device, but the current frame is not sent to the STA, the STA device enters the snooze state. Condition 3: when the operation target identifier of the previously set frame includes an indication for the STA device and the STA device receives more data frames whose data bit indications are 0, the STA device enters the doze state. the STA device goes into a dormant state. Condition 3: when the operation target identifier of the previously set frame includes an indication for the STA device and the STA device receives more data frames whose data bit indications are 0, the STA device enters the doze state. the STA device goes into a dormant state. Condition 3: when the operation target identifier of the previously set frame includes an indication for the STA device and the STA device receives more data frames whose data bit indications are 0, the STA device enters the doze state.

[0019] If an existing energy saving method is adopted, the lack of the TXOP PS of each frame in the same TXOP is completely the same. In the MU-MIMO mode, when the absence of the TXOP PS indication of the first frame indicates that energy saving is allowed, and if the STA device not included in the first frame is associated in the operation target indicator of the next TXOP frame, and because the STA device has snoozed after receiving the first frame, there can be no answer to the indication of the next frame. However, in the SU-MIMO mode, when the absence of the TXOP PS indication of the first frame indicates that energy saving is allowed, and if the STA indicated in the next TXOP frame is different from the STA device indicated by the first frame, and because the STA device indicated in the next frame took a nap after receiving the first frame,

[0020] With reference to the above drawback, an embodiment of the invention proposes a power saving method, and in the same TXOP, different indicators lack of TXOP PS can be set for different frames; especially on the basis of whether the communication system in which the AP is located allows saving energy in the current TXOP, and whether the STA station identifier is added again in the next TXOP frame, the AP sets the absence of the TXOP PS of each frame, and the STA assesses whether to go in snooze state on the basis of the lack of TXOP TX. Detailed information is provided below in Embodiment 1 to Embodiment 6.

[0021] It should be noted that in the following embodiments of the invention, the STA is STA with the function of entering the doze state; and in embodiments of the invention, the STA device is a STA device with the function of entering the doze state. However, as described above, the STA device without the snooze function will always remain awake, does not have to judge whether it can go into a dormancy state and accordingly does not have to take the method according to the invention to improve the efficiency of the snooze to save energy.

[0022] Furthermore, based on the description of the above technology background, it can be known that:

STA, being an STA with the function of entering the state of a nap, includes: STA is STA with the function of entering the state of a snooze and maintaining the state of a snooze until the end of the current TXOP; and

- the STA device, which is an STA device with the function of entering the doze state, comprises: the STA device is an STA device with the function of entering the state of the snooze and maintaining the state of the snooze until the end of the current TXOP.

[0023] That is, when the STA device decides to enter the Doze state, the STA device goes into the Doze state and maintains the Doze state until the current TXOP ends. In the following embodiments, the STA device entering the Doze state is of significance.

[0024] Fig. 1 is a flow diagram of the energy saving method according to the embodiment 1 of the invention. In the embodiment 1 of the invention, the operation of the AP device is taken as an example to illustrate a method for saving energy. As shown in Figure 1, the method includes the following procedure.

[0025] Step 101: Based on whether energy saving is allowed in the current TXOP, and whether the STA identifier is re-added the operation target identifier of the next frame for each frame for the current TXOP, the AP sets a TXOP power limit indication for each frame.

[0026] Step 102: The AP device sends to the STA device one or more frames for the current TXOP, so that when the TXOP power save indication of the current frame indicates that power saving is allowed, the STA device determines whether to switch to the snooze state based on the result evaluation. the condition of naps.

[0027] In this step, each frame includes: a frame operation objective identifier and a TXOP frame power save indication.

[0028] Based on the above technical solution, a specific method for step 101 is provided. In the same TXOP, the TXOP power save indication for each frame is appropriately set by the AP based on whether energy saving is allowed at the current TXOP, and whether the station identifier The STA is added again in the operation target identifier of the next frame for each frame for the current TXOP. In particular, the AP may take two ways to judge whether the STA identifier is added again in the operation target identifier of the next frame for each frame for the current TXOP. The first method is that: it is judged whether the operation target IDs of the current frame and frame in front of the current frame indicate the STA device for which it is required to transfer data in all frames after the current frame in the current TXOP, and if so, indicates that the new STA device is not indicated in each of the following frames for the current frame, the condition that no identifier of the STA station is added again later is met; otherwise, the condition that no STA identifier is added again later is unfulfilled. The second method is: it is assessed if the operation target identifier of the current frame indicates an STA device for which data is required to be transferred in all frames on the current frame in the current TXOP, and if so, indicates that the new STA device is not indicated in each of the following frames for the current frame, condition. that no identifier of the STA station is added again later is met; otherwise, the condition that no identifier of the STA station is added again that a new STA device is not indicated in each of the following frames for the current frame, the condition that no identifier of the STA station is added again later is satisfied; otherwise, the condition that no STA identifier is added again later is unfulfilled. The second method is: it is assessed if the operation target identifier of the current frame indicates an STA device for which data is required to be transferred in all frames on the current frame in the current TXOP, and if so, indicates that the new STA device is not indicated in each of the following frames for the current frame, condition. that no identifier of the STA station is added again later is met; otherwise, the condition that no identifier of the STA station is added again that a new STA device is not indicated in each of the following frames for the current frame, the condition that no identifier of the STA station is added again later is satisfied; otherwise, the condition that no STA identifier is added again later is unfulfilled. The second method is: it is assessed if the operation target identifier of the current frame indicates an STA device for which data is required to be transferred in all frames on the current frame in the current TXOP, and if so, indicates that the new STA device is not indicated in each of the following frames for the current frame, condition. that no identifier of the STA station is added again later is met; otherwise, the condition that no identifier of the STA station is added again that no identifier of the STA station is added again later is met; otherwise, the condition that no STA identifier is added again later is unfulfilled. The second method is: it is assessed if the operation target identifier of the current frame indicates an STA device for which data is required to be transferred in all frames on the current frame in the current TXOP, and if so, indicates that the new STA device is not indicated in each of the following frames for the current frame, condition. that no identifier of the STA station is added again later is met; otherwise, the condition that no identifier of the STA station is added again that no identifier of the STA station is added again later is met; otherwise, the condition that no STA identifier is added again later is unfulfilled. The second method is: it is assessed if the operation target identifier of the current frame indicates an STA device for which data is required to be transferred in all frames on the current frame in the current TXOP, and if so, indicates that the new STA device is not indicated in each of the following frames for the current frame, condition. that no identifier of the STA station is added again later is met; otherwise, the condition that no identifier of the STA station is added again The second method is: it is assessed if the operation target identifier of the current frame indicates an STA device for which data is required to be transferred in all frames on the current frame in the current TXOP, and if so, indicates that the new STA device is not indicated in each of the following frames for the current frame, condition. that no identifier of the STA station is added again later is met; otherwise, the condition that no identifier of the STA station is added again The second method is: it is assessed if the operation target identifier of the current frame indicates an STA device for which data is required to be transferred in all frames on the current frame in the current TXOP, and if so, indicates that the new STA device is not indicated in each of the following frames for the current frame, condition. that no identifier of the STA station is added again later is met; otherwise, the condition that no identifier of the STA station is added again that no identifier of the STA station is added again later is met; otherwise, the condition that no identifier of the STA station is added again that no identifier of the STA station is added again later is met; otherwise, the condition that no identifier of the STA station is added again

- 9 are later unfulfilled. Each of the above methods was adopted to assess if the STA station identifier is added again later, and the way the TXOP power save indication is set is that: when no STA station identifier is added again later and energy saving is allowed in the current TXOP, the energy saving indication The TXOP of the current frame for the current TXOP can be set to the allowed energy saving; or the TXOP power save indication of the current frame for the current TXOP may also be set to forbidden power save, and the TXOP power save indication of any frame after the current frame is set to the allowed power save. When the STA station ID is added again later, the TXOP power save indication of the current frame can be set to forbidden energy saving, i.e. no energy saving is allowed in the current TXOP, as long as the STA station ID is added again later, the TXOP power save indication of the current frame can be set forbidden energy saving; and when energy saving is not allowed in the current TXOP, regardless of whether the STA station identifier is added again later, the TXOP power save indication of the current frame can be set to forbidden energy saving. the TXOP power save indication of the current frame can be set to forbidden energy saving; and when energy saving is not allowed in the current TXOP, regardless of whether the STA station identifier is added again later, the TXOP power save indication of the current frame can be set to forbidden energy saving. the TXOP power save indication of the current frame can be set to forbidden energy saving; and when energy saving is not allowed in the current TXOP, regardless of whether the STA station identifier is added again later, the TXOP power save indication of the current frame can be set to forbidden energy saving.

[0029] In the embodiment 1 of the invention, the AP may adopt different settings for the TXOP power save indications of different frames in the same TXOP, i.e. it is possible to set some frames in the TXOP to the allowed energy saving, and the STA device may switch to a snooze state frames; and the remaining frames in the same TXOP to forbid saving energy, and the device can maintain the state of awakening in frames. Only when both conditions that no STA station identifier is added again and energy saving is allowed are met, the STA device sets the TXOP power save indication of the frame or frame to the allowed power saving frame, so that the STA device determines whether to evaluate snooze condition based on the TXOP power save indication. Because various TXOP power save indications are set for different frames, and if the operation frame identifier of the first frame does not include all STA devices associated with the TXOP, the AP device may set the TXOP power save indication of the first frame to forbidden energy saving, and until target identifiers the operation of multiple frames from the first frame to the current frame is included in all STA devices associated with the TXOP, the TXOP power save indication of the current frame is set to allow power saving and hence the method still applies in case that the operation target identifier in the first TXOP frame does not contain all STA devices associated with the TXOP, thus extending the scope of energy saving applications. In addition, in the case

- 10 TXOP power save indicates that energy saving is allowed, each STA device evaluates whether to switch to a snooze state based on the nap condition, thereby increasing the energy saving effect.

[0030] It should be noted that the above STA re-added later refers to STA with the function of entering the Doze state; a case where the invention must be avoided is that: if the STA with the snooze function goes into the snooze state in the current frame, the STA can not receive the data to be sent to the STA in the next frame for the current frame in the TXOP, which results in decreased communication performance . Accordingly, an embodiment of the invention must indicate whether the identifier of the STA station with the function of entering the doze state is added again later (i.e., in another frame for the current frame in the TXOP) in the current frame, making sure that the STA with the function of changing snooze state and re-added later does not go into the snooze state in the current frame based on the indication, and in this way it can receive data for sending to STA in the current frame. However, whether the STA with the snooze function is added again later does not affect the above case, which the invention must avoid and therefore the embodiment of the invention need not indicate whether the STA station ID with the function of entering the doze state is added again later in the current frame, and this does not affect the setting of each bit relating to whether the identifier of the STA is added again later in the above description and the description of the invention below.

[0031] In step 102, the AP device sends to the STA device one or more frames for the current TXOP, so that when the TXOP power save indication of the current frame indicates that power saving is allowed, the STA device determines whether to switch to the snooze state based on the evaluation result of snooze condition. It is easily understood that, here, determining whether to enter a napping state can be a determination of whether one is able to enter the state of napping in the embodiment.

[0032] It is easily understood that as described in step 102, if the TXOP power save indication of the current frame indicates that energy saving is allowed, the STA device determines the transition to a snooze state based on the evaluation of the snooze result and in an embodiment the STA device it can go into a snooze state in the current frame; in another embodiment, the STA device may not snooze in the current frame, but it enters the doze state to reach the current number of frames.

[0033] In addition, as described above, when the STA device decides to go into the Doze state, the STA device goes into the Doze state and maintains the Doze state until the current TXOP ends. In the following embodiments, the STA device entering the Doze state is relevant.

[0034] Fig. 2 is a flow diagram of an energy saving method according to the embodiment 2 of the invention. In the embodiment of the invention, the operation process

- 11 STA devices were taken as an example to illustrate how to save energy. As shown in FIG. 2, the method includes the following procedure.

[0035] Step 201: The STA device obtains a current frame for the current TXOP in which the current frame includes an energy saving indication set by the AP based on whether power saving is allowed at the current TXOP and whether the STA identifier is added again in the identifier the operation of the next frame.

[0036] In this step, the TXOP power save indication for each frame obtained by the STA device is appropriately set by the AP based on whether energy saving is allowed at the current TXOP, and whether the STA station identifier is added again in the operation target of the next frame for frames for the current TXOP. In particular, the AP may adopt two methods to assess whether the STA identifier is added again in the operation target identifier of the next frame for each frame for the current TXOP. The first method is: it is judged whether the operation target ID of the current frame and the frame operation target identifier in front of the current frame indicate the STA device for which data is requested in all frames after the current frame in the current TXOP, and if so, indicates that a new STA device is not indicated in each of the subsequent frames for the current frame, and the condition that no identifier of the STA station is added again later is satisfied; otherwise, the condition that no STA identifier is added again later is unfulfilled. The second method is: it is judged whether the operation target identifier of the current frame indicates the STA device for which data is required to be transferred in all frames on the current frame in the current TXOP, and if so, indicates that the new STA device is not indicated in each subsequent frame for the current frame, and the condition that no identifier of the STA station is added again later is satisfied; otherwise, the condition that no STA identifier is added again later is unfulfilled. Any of the above methods have been adopted to assess whether the STA station identifier is added again later, and the method for setting the TXOP power save indication is such that: when no identifier is added again later and energy saving is allowed in the current TXOP, the TXOP power save indication the current frame for the current TXOP can be set to allow power saving; or the TXOP power save indication of the current frame for the current TXOP can also be set to prohibit power save, and the TXOP power save indication of any frame after the current frame is set to allow power saving. When the STA station identifier is added again later, the TXOP power save indication of the current frame can be set to prohibit energy saving, this is regardless of whether power saving is allowed in the current TXOP, as long as the STA station identifier is added again later, the TXOP power save indication of the current frame can be set to prohibit energy saving; and when energy saving is forbidden in the current TXOP, regardless of whether the STA station identifier is added again later, the TXOP power save indication of the current frame may be set to forbid energy saving.

[0037] Step 202: when the TXOP power save indication of the current frame indicates that energy saving is allowed, the STA device determines whether to switch to a snooze state based on the snooze condition evaluation result. [0038] Based on the above technical solution, furthermore, the TXOP power save indication of the current frame is forbidden to save power, the STA device uses the next frame as the current frame and returns to step 201.

In an embodiment of the invention, the TXOP power saving indications of different frames in the same TXOP may be different, and only if both conditions that no STA station identifier is added again and energy saving is allowed are met, then the energy saving indication The TXOP of the frame or frame for the frame indicates the permission to save power; only when the TXOP power save indication of the current frame indicates that energy saving is allowed, the STA evaluates the snooze condition and determines whether to snooze on the basis of the evaluation result. Because different TXOP power save indications are set for different frames, and if the evaluation identifier of the first frame operation does not include all STA devices associated with the TXOP, the TXOP power save indication of the first frame may be set to prohibit power save, and until the target identifiers of the multiple frame operations from the first frame to the current frame of all STA devices associated with the TXOP, the TXOP power save indication of the current frame is set to permit power saving, and thus the method still applies to the case where the operation object identifier in the first TXOP frame does not include all STA devices associated with the TXOP, thus extending the scope of the power saving application. In addition, in the case where the operation object identifier in the first TXOP frame does not include all STA devices associated with the TXOP, energy conservation can not at all be performed in the TXOP using the existing energy saving method,

[0040] Fig. 3 is a flow diagram of an energy saving method according to the embodiment 3 of the invention. In the embodiment 3 of the invention, the operation of the AP device in combination with the STA device was taken as an example to illustrate a method for saving energy. In the embodiment 3 of the invention, for the TXOP power save indication, an indication of no TXOP power save is taken as an example, and when no STA device ID is re-added in the current TXOP, and energy saving is allowed in the current TXOP, an example is taken as an example that the AP can set the non-TXOP power save indication to not in the current frame. In embodiment 3, the method includes the following procedure.

[0041] Step 301: The AP device sends to the STA device one or more frames for the current TXOP. Each frame contains: the frame operation objective identifier and the TXOP frame power save indication, and the no TXOP power save indication for each frame is appropriately set by the AP based on whether the STA station ID is added again in the operation target of the next frame for each frame for the current TXOP.

[0042] In this step, the TXOP includes one or more frames, and the AP device provides in each frame to the STA device a TXOP power save indication of the current frame, and provides an identifier of the STA device corresponding to the operation indicated by the current frame. The AP carries the no TXOP power save indication and target operation identifier in the preamble sequence of each frame and sends a preamble sequence to the STA device. Especially in the very high bandwidth A1 signal field (abbreviated as VHT-SIG-A1) of the preamble sequences of each frame, one bit can be adopted to indicate no TXOP power save, and more than one bit can be taken to indicate the operation objective identifier. For example, for the purpose ID of the operation, at least one bit in the VHT-SIG-A1 field may be adopted to indicate the operation objective identifier corresponding to the frame. If no TXOP power save is indicated, the B22 bit of the VHT-SIG-A1 field can be accepted to indicate no TXOP power save, and the bit is called the TXOP TX non-TX bit. If the bit lacking the TXOP TX is 0, it indicates that the no TXOP power save indication is no, and the STA of this BSS may perform a power save operation, i.e. the STA may switch between the awake state and the snooze state. If the bit is lacking, the TXOP is 1, it indicates that the TXOP power save indication is yes, and the STA of this BSS is forbidden to perform energy saving operations, i.e. the STA can maintain the awake state. bit B22 of the VHT-SIG-A1 field can be adopted to indicate no TXOP power save, and the bit is called the TXOP PS non-TX bit. If the bit lacking the TXOP TX is 0, it indicates that the no TXOP power save indication is no, and the STA of this BSS may perform a power save operation, i.e. the STA may switch between the awake state and the snooze state. If the bit is lacking, the TXOP is 1, it indicates that the TXOP power save indication is yes, and the STA of this BSS is forbidden to perform energy saving operations, i.e. the STA can maintain the awake state. bit B22 of the VHT-SIG-A1 field can be adopted to indicate no TXOP power save, and the bit is called the TXOP PS non-TX bit. If the bit lacking the TXOP TX is 0, it indicates that the no TXOP power save indication is no, and the STA of this BSS may perform a power save operation, i.e. the STA may switch between the awake state and the snooze state. If the bit is lacking, the TXOP is 1, it indicates that the TXOP power save indication is yes, and the STA of this BSS is forbidden to perform energy saving operations, i.e. the STA can maintain the awake state. that is, the STA can switch between the state of awakening and the state of nap. If the bit is lacking, the TXOP is 1, it indicates that the TXOP power save indication is yes, and the STA of this BSS is forbidden to perform energy saving operations, i.e. the STA can maintain the awake state. that is, the STA can switch between the state of awakening and the state of nap. If the bit is lacking, the TXOP is 1, it indicates that the TXOP power save indication is yes, and the STA of this BSS is forbidden to perform energy saving operations, i.e. the STA can maintain the awake state.

[0043] When the bit is set to lack the TXOP PS of each frame, the AP not only performs the setting based on whether power saving is allowed in the current TXOP, but also needs to perform setting based on whether the STA station identifier is added again in the next frame for current frame in TXOP. In particular, if no identifier of the STA is re-added in the next frame and energy saving is allowed in the current TXOP, the AP may set the bit lacking the TXOP TX of the current frame to 0 indicating that the STA is allowed to realize energy saving, or can set bit lack of the TXOP current frame per 1, indicating that STA is forbidden to realize energy saving. If no identifier of the STA station is added again in the next frame, and energy saving is not allowed in the current TXOP, AP sets the bit lacking the TXOP TX of the current frame to 1, indicating that STA has no permission to implement power saving. If the identifier of the STA is added again in the next frame, the AP sets the bit lacking the TXOP TX of the current frame to 1, indicating that the STA is not allowed to realize the power save in the current TXOP. In particular, the AP device may adopt two methods recorded in embodiment 1 of the invention and embodiment 2 of the invention to judge whether the identifier of the STA is added again in the operation target identifier of the next frame for each frame for the current TXOP. In the embodiment 3 of the invention, only the adoption of the second method is taken as If the identifier of the STA is added again in the next frame, the AP sets the bit lacking the TXOP TX of the current frame to 1, indicating that the STA is not allowed to realize the power save in the current TXOP. In particular, the AP device may adopt two methods recorded in embodiment 1 of the invention and embodiment 2 of the invention to judge whether the identifier of the STA is added again in the operation target identifier of the next frame for each frame for the current TXOP. In the embodiment 3 of the invention, only the adoption of the second method is taken as If the identifier of the STA is added again in the next frame, the AP sets the bit lacking the TXOP TX of the current frame to 1, indicating that the STA is not allowed to realize the power save in the current TXOP. In particular, the AP device may adopt two methods recorded in embodiment 1 of the invention and embodiment 2 of the invention to judge whether the identifier of the STA is added again in the operation target identifier of the next frame for each frame for the current TXOP. In the embodiment 3 of the invention, only the adoption of the second method is taken as the AP device may adopt two methods recorded in embodiment 1 of the invention and embodiment 2 of the invention to judge whether the identifier of the STA is added again in the operation target identifier of the next frame for each frame for the current TXOP. In the embodiment 3 of the invention, only the adoption of the second method is taken as the AP device may adopt two methods recorded in embodiment 1 of the invention and embodiment 2 of the invention to judge whether the identifier of the STA is added again in the operation target identifier of the next frame for each frame for the current TXOP. In the embodiment 3 of the invention, only the adoption of the second method is taken as

- example for illustration. Especially if in the current frame and all frames on the current TXOP frame the AP device transmits data to only the same STA device, or the AP device transmits data to only several users in the same MU-MIMO group, the AP evaluates that no identifier the STA station is not added again later, and therefore the lack of the TXOP TX can be used to indicate whether the STA can go into a snooze state, that is, you can set the lack of the TXOP PS = 0, or you can set the lack of the TXOP PS = 1. W otherwise, the device may set the bit lacking the TXOP TX to 1, indicating that the STA device may not be in a snooze state, i.e. if the frames on the current frame in the TXOP device must send data to an STA device other than several STA devices, which is indicated by the operation target identifier of the current frame, the AP may indicate that the STA device can not enter the doze state. The specific case that in frames on a TXOP frame is an AP device transmits data to an STA device other than several STA devices that are indicated by the operation target identifier of the current frame includes: in SU-MIMO mode, the AP device transmits data to an STA device other than an STA device that is indicated by the operation target identifier of the current frame; in the MU-MIMO mode, the AP transmits data to an STA device other than a set of multiple STA devices that are indicated by the operation target identifier of the current frame. that in frames over the current TXOP frame, the AP device transmits data to the STA device other than several STA devices that are indicated by the operation target identifier of the current frame includes: in SU-MIMO mode, the AP device transmits data to an STA device other than the STA device, which is indicated by the operation target's ID of the current frame; in the MU-MIMO mode, the AP transmits data to an STA device other than a set of multiple STA devices that are indicated by the operation target identifier of the current frame. that in frames over the current TXOP frame, the AP device transmits data to the STA device other than several STA devices that are indicated by the operation target identifier of the current frame includes: in SU-MIMO mode, the AP device transmits data to an STA device other than the STA device, which is indicated by the operation target's ID of the current frame; in the MU-MIMO mode, the AP transmits data to an STA device other than a set of multiple STA devices that are indicated by the operation target identifier of the current frame.

[0044] In the MU-MIMO mode, the operation objective identifier is the group identity (abbreviated Group ID). Before this energy saving method is executed, the group ID is defined by signaling and set on the STA device. In particular, in the MU-MIMO mode, at least one MU-MIMO group is included in which the MU-MIMO group contains more than one STA device, typically four STA devices, each of the above at least one MU-MIMO group being identified by means of the MU-MIMO group. Group ID. Before performing this energy saving method, the AP device sends the above group ID definition to each STA device via appropriate signaling; upon receipt of the above definition, each STA device stores a portion appropriate to itself in the above definition, such that when this energy saving method is performed, the AP device sends the operation objective identifier to the STA device, i.e. the group ID; after receiving the group ID, the STA device may know if the STA device belongs to the MU-MIMO group identified by the group ID based on the definition of the group ID stored in the STA device; if the STA device belongs to the MU-MIMO group indicated by the group ID, it indicates that the operation object identifier contains an indication for that STA device, and if the STA device does not belong to the MU-MIMO group indicated by the group ID, indicates that the operation target identifier does not contain an indication for this STA device. In SU-MIMO mode, the operation objective identifier is a partial association identifier (abbreviated AID) of the STA corresponding to the frame, or the operation objective identifier is part of the AID STA corresponding to the frame, which is also referred to as the partial AID. A specific implementation method is that in SU-MIMO mode, AID creates 12 bits, and that the target operation identifier is 9 lower of the 12 bits of the AID. If the AID or partial AID is the same as the AID or partial AID of this STA device, it indicates that the operation object identifier contains an indication for that STA device and if the AID or partial AID

- 15 is different from the AID or partial Aid of the STA device, indicates that the operation object identifier does not include an indication for that STA device.

[0045] Step 302: The STA device obtains the current frame for the current TXOP in which the current frame comprises the TXOP power save indication frame and the frame operation objective identifier.

[0046] In this step, the STA device obtains the no TXOP power save indication and the operation target ID of the current frame from the frame sequence preamble from the AP device.

[0047] Step 303: The STA device judges whether the no TXOP power save indication of the current frame is yes or no, if it is not, step 304 is performed; if it is so, the STA device maintains the awake state and the STA device uses the next frame as the new current frame and returns to step 302.

[0048] At this stage, the STA device assesses whether the TXOP power save is quoted as one bit used for determining the indication is yes or no, and if the bit is no, indicates that the two conditions are met simultaneously, that is: TXOP power save is allowed and no identifier of the STA station is added again later, energy saving can be realized and the procedure is continued for the next step 304; if the bit is yes, it indicates that one of the conditions is not met, or none of the conditions is met and the STA device maintains the awake state.

[0049] Step 304: In each frame from the current frame to the last frame for the current TXOP, the STA device judges whether the first snooze condition is satisfied, and if it is, the STA device goes into the Doze state; if not, the STA device maintains the awake state.

[0050] In this step, it is not required that the doWn conditions in the existing communication protocol be modified according to the first doze condition, Which allows more convenient to modernize and modify the existing communication device.

[0051] In particular, in the MU-MIMO mode, the first doze condition may comprise any of the following three conditions or any combination thereof, and when one of the conditions is satisfied, i.e. judging that the first doze condition is satisfied, the STA device enters the snooze state ; when all of at least one condition included in the first doze condition is not satisfied, the STA device maintains the awake state. Three conditions may especially include the following content. Condition 1: when the operation target identifier of the current frame does not contain an indication for this STA device, the STA device goes into a snooze state. Condition 2: when the target operation identifier of the current frame contains an indication for this STA device and the indication of the spatial multiplexing stream number corresponding to that STA is 0, the STA device goes into a dormant state. Condition 3: when the operation target identifier of the current frame contains an indication for this STA device, and the STA receives more data frames whose data bit indications are 0, the device goes into a snooze state.

[0052] In this step, in the SU-MIMO mode, the first doze condition may comprise one of the following three conditions or any combination thereof, and when one of the conditions is satisfied, that is, judging that the first doze condition is satisfied, the device STA goes into a state of nap; when all of at least one condition contained in the first nap condition are unfulfilled, assessing that the first conditionsnooze is unfulfilled, the STA device maintains the awake state. Three conditions, in particular, may include the following content. Condition 1: when the partial AID indicated in the operation objective identifier of the current frame is different from the partial AID of this STA device, the STA device goes into a dormant state. Condition 2: when the partial AID indicated in the operation objective identifier of the current frame is the same as the partial AID of this STA device, but the current frame is not sent to this STA, the STA device goes into the Doze state. In particular, the STA device can judge whether the current frame is sent to this STA device in a number of ways, the specific implementation of the method being that the STA device judges whether the MAC identifier of the current frame matches the MAC identifier of that STA device, and if so, this current frame is sent to this STA device; if not, the current frame is not sent to this STA device. Condition 3: when the operation target identifier of the current frame contains an indication for this STA device, and STA receives more data frames whose data bit indicators are 0, the STA device enters the snooze state.

[0053] When step 304 is performed, in each frame from the current frame to the last frame for the current TXOP, the evaluation process of the exemplary implementation method is as follows.

[0054] The first step: the STA device judges whether the operation target identifier of the current frame includes an indication for that STA device, and if so, a second step is performed; if not, the STA device goes into a dormant state.

[0055] The second step: in the MU-MIMO mode, it is judged whether the indication of the spatial multiplexing stream corresponding to that STA is 0, or whether the STA receives more data frames whose data bit indications are 0, and if so, the STA device goes into a nap; if not, the STA device maintains the awake state. In SU-MIMO mode, it is judged whether the current frame is sent to this STA device, or whether the STA receives more data frames whose data bit indications are 0, and if the current frame is not sent to this STA device or the STA device receives more data frames whose data bit indicia is 0, the STA device goes into a snooze state; and if the current frame is sent to this STA device and this STA device receives more data frames,

[0056] In the embodiment 3 of the invention, the indications of the lack of TXOPs of different frames in the same TXOP may be different, and only when energy saving is allowed and no identifier of the STA is added again in the next TXOP frame, the indication of the absence of the TXIOP PS of the frame may indicate permission to save energy, and STA determines whether to evaluate the first nap condition as indicated by the lack of the TXOP PS of the current frame. Because different indications are missing, no TXOPs are set for different frames, and if the operation target identifier of the first frame does not contain all of the STA devices

- TXOP related ones, the absence of the TXOP PS indication of the first frame may be set to forbid saving power. It is assumed that the first method of evaluating whether the STA station identifier is added again is adopted, and only when the operation targets of many frames from the first frame to the current frame have covered all STA devices associated with the TXOP, the absence indication of the TXOP PS of the current frame can be set for saving energy; it is assumed that a second method of evaluating whether the STA identifier is added is added, and only when the operation target identifier of the current frame has covered all STA devices associated with all frames on the current frame in the TXOP, the indication of the absence of the TXOP PS of the current frame may be set to permit energy saving; hence the method still applies if the operation object identifier in the first TXOP frame does not include all STA devices associated with the TXOP, thus extending the scope of the energy saving application. Furthermore, in the case that the operation object identifier in the first TXOP frame does not include all STA devices associated with the TXOP, energy saving can not be realized at all in the TXOP using the existing energy saving method, and if the energy saving method of the inventive embodiment 3 is adopted, an indication of the absence of the TXOP PS of the first frame is forbidding energy saving, the STA device does not enter the doze state after receiving the first frame and until the frame is received in which the indicator is missing, the TXOP PS is allowed to save energy, the STA device assesses

[0057] Fig. 4 is a flow diagram of an energy saving method according to Embodiment 4 of the invention. In embodiment 4 of the invention, the operation of the AP device including the STA device is taken as an example to illustrate the energy saving method. In the embodiment 4 of the invention, the snooze conditions include a first doze condition and a second doze condition. Based on the technology according to the technical solution recorded in embodiment 3 of the invention, when the indication of the absence of the TXOP PS of the current frame is forbidding energy saving, a step has been added to evaluate the STA device for the second snooze condition and record the result of the evaluation; when the indication of the absence of the TXOP PS of the current frame is allowing the saving of energy, a step has been added to determine whether to switch to the snooze state based on the recorded snooze result.

[0058] Step 401: The AP device sends to the STA device one or more frames for the current TXOP. Each frame contains: the frame operation target identifier and the TXOP frame power save indication, and the TXOP power save indication for each frame is appropriately set by the AP based on whether the STA station ID is added again in the operation target of the next frame for each frame for the current frame TXOP.

[0059] This step is the same as step 301 in embodiment 3 of the invention and is not repeated here.

[0060] Step 402: The STA device obtains the current frame for the current TXOP in which the current frame comprises the TXOP power save indication frame and the frame operation objective identifier.

[0061] This step is the same as step 302 of embodiment 3 of the invention and is not repeated here.

[0062] Step 403: The STA device judges whether the TXOP power save indication of the current frame is yes or no, and if it is not, step 404 is executed; if it is so, step 406 is performed.

[0063] Step 404: The STA device assesses whether the recorded evaluation result is satisfied or not met, and if it is satisfied, the STA device goes into the Doze state; if it is not met, step 405 is performed.

[0064] Step 405: In each frame from the current frame to the last frame for the current TXOP, the STA device judges whether the first doze condition is met, and if it is, the STA device goes into a snooze state; if it is not, the STA device maintains the awake state.

[0065] This step is the same as step 304 of embodiment 3 of the invention and is not repeated here.

[0066] Step 406: The STA device maintains the state of arousal, judges whether the second nap condition is met, writes the result of the evaluation, uses the next frame as the new current frame, and returns to step 402.

[0067] In this step, especially in the MU-MIMO mode, the second doze condition may comprise a combination of one or both of the following two conditions. When one of the conditions is met, it is judged that the second snooze condition is met, the STA device records the result of the assessment as: satisfied. When no condition in the second nap condition is met, the second nap condition is judged unfulfilled and the STA device records the evaluation result as: unfulfilled. Two conditions in particular may include the following content. Condition 1: the operation target identifier of the current frame contains an indication for this STA device and the indication of the spatial multiplexing number corresponding to that STA is 0. Condition 2: the operation target identifier of the current frame contains an indication for that STA device and the STA receives more data frames .

[0068] In this step, in the SU-MIMO mode, the second doze condition may comprise a combination of one or both of the following two conditions. When one of the conditions is met, it is judging that the second snooze condition is met, the STA device writes the result of the assessment as: satisfied. When none of the conditions included in the second snooze condition are met, the second snooze condition is judged unfulfilled, the STA device writes the evaluation result as: unfulfilled. Two conditions may especially include the following content. Condition 1: the partial AID indicated in the operation purpose identifier of the current frame is the same as the partial AID of this STA device, but the current AID

- 19 frame is not sent to this STA device. In particular, the STA device can in many ways judge whether the current frame is sent to this STA device, a specific implementation method is that the STA device judges whether the MAC identifier of the current frame coincides with the MAC identifier of that STA device, and if so , the current frame is sent to this STA device; if not, the current frame is not sent to this STA device. Condition 2: the operation target identifier of the current frame contains an indication for this STA device, and this STA device receives more data frames whose data bit indicia is 0.

[0069] In embodiment 4 of the invention, the indication of the absence of TXOPs of different frames in the same TXOP may be different, but only when energy saving is allowed and no identifier of the STA is added again in the next TXOP frame, the absence of the frame TXOP PS indicates permission energy saving. Based on the indication, the absence of the TXOP PS of the current frame when the absence of the current frame PSOP indication is forbidding energy saving, the STA first evaluates the second snooze condition and saves the evaluation result and then evaluates the absence of the next frame PS PS indication; in another procedure, when receiving a frame in which the indication of the absence of the TXOP PS is to save energy, the STA device first determines whether to switch to a snooze state based on the recorded result of the evaluation of the second snooze condition and when the result of the evaluation is not met, the STA device then evaluates the first snooze condition for multiple frames from the current frame to the last frame, thus determining whether to snooze. The method still applies to the case that the operation object identifier in the first TXOP frame does not include all STA devices associated with the TXOP, and thus not only extends the scope of energy saving, but also increases the power saving effect. In addition, by judging the second snooze condition before and recording the result, if the indication of the absence of the TXOP PS is forbidding energy saving, when the result is that the second condition is met, upon receipt of the frame in which the indication of the absence of the TXOP PS is to save energy, the STA device may immediately enter the state of naps, and it is not required to evaluate the first nap condition, such that the STA device can quickly enter the dormancy state, so that it even more saves the evaluation time for the snooze state, thereby increasing the effect of energy saving. In particular, there may be an STA device that satisfies the second doze condition in at least one of the frames, where the absence of the TXOP PS is forbidden to save energy, but does not satisfy the second nap in each frame where the indication of the absence of the TXOP PS is allowing energy saving, and if the technical solutions embodied in other embodiments are adopted, the STA device is unable to enter a dormant state, whereas if the technical solution embodied in embodiment 4 of the invention is adopted, the STA device can go into a dormant state,

[0070] Furthermore, in the embodiment 3 of the invention and embodiment 4 of the invention, the TXOP power save indication is only a specific way of implementing a TXOP power save indication, and technicians in the art may understand from the prior art that the indication of the TXOP power save may be

Also accepted for determining a TXOP power save indication when the indication of TXOP power save saving is yes, it indicates that power conservation in the current TXOP is allowed; and when the indication of the TXOP power save allowed is no, it means that power conservation in the current TXOP is forbidden.

[0071] Furthermore, in the embodiment 1 of the invention to embodiment 4 of the invention, when setting the TXOP power save indication, the AP may more restrict the number of times when the TXOP power save indication value is changed and / or the form of the TXOP power save indication value is changed.

[0072] Because in the same TXOP, based on whether energy saving is allowed in the current TXOP and whether the STA identifier is added again in the next TXOP frame, the AP sets the TXOP power save indication for each frame and the display value TXOP power saving can change many times; for example, energy saving is allowed in the first frame and the STA station identifier is added again later, the TXOP power save indication of the first frame is forbidding energy saving, as an example the absence of the TXOP TX is taken as an example; in the second frame energy saving is allowed and no identifier of the STA station is added again later, the indication of the TXOP power save of the second frame is to save power, as an example, the absence of the TXOP TX is taken as 0; in the third frame, energy saving is not allowed and no STA identifier is added again later, the TXOP power save indication of the third frame is forbidden to save energy, no TXOP TX indication is taken as an example, and the remaining can be deduced by analogy. Based on the above technical solution, and to reduce the complexity of processing procedures of the AP device and STA device when the TXOP power save indication is set, the number of times the TXOP power save value is changed in the TXOP can be predetermined, and the AP device can also respectively set the TXOP power save indication for each frame based on a pre-set number of times, when the TXOP power save indication is changed. For example, a predetermined number of times when the display value is changed two or three times, and an exemplary embodiment is that a predetermined number of times when the TXOP power save indication value is changed is one, that is, the power save indication in the same TXOP. The TXOP can only change once. In the following example, based on whether energy saving is allowed in the current TXOP and whether the STA station ID is added again in the next TXOP frame, the third frame should be set to no PS TXOP = 1, but a pre-set number of times when the TXOP power save indication value is changed one, and in the second frame the TXOP power save indication has changed relative to the first frame,

[0073] Based on the above technical solution, the form of changing the value of the TXOP power save indication in one TXOP can be further set earlier,

- 21 a the AP sets the TXOP power save indication for each frame based on the previously set form of changing the TXOP power save indication value. For example, if you previously set the form of changing the TXOP power save indication value in one TXOP, you will: change from the display forbidden to save energy to the indication, save energy. In this way, in the same TXOP, only the TXOP power save indication is allowed to change from showing the forbidden energy saving to the indication of the allowed energy saving, i.e. if the TXOP power save indication of the previous frame for the current frame is forbidding energy saving, the TXOP current power save indication the frames can be set to the allowed energy saving, and if the TXOP power save indication of the previous frame for the current frame indicates the power save permission, the TXOP power save indication of the current frame can not be set to prohibit power save. Taking an indication of the lack of a TXOP PS as an example, its value can be changed only from 1 to 0, and when, based on whether energy saving is allowed in the current TXOP and whether the STA identifier is added again in the operation target of the next frame for each frame for the current TXOP, it is judged that the power saving permission indication should be changed to the power saving prohibition display, the AP device does not change the TXOP power save indication setting, i.e. the TXOP power save indication is still maintained as an energy saving permission indication.

[0074] Furthermore, based on the above technical solution, the current frame in the procedure can be further extended. Particularly, in step 302 and step 402, in addition to obtaining the current frame for the current TXOP, the STA device may also obtain more than one frame from the first frame to the current frame for the current TXOP, and more than one frame contains corresponding frame operation objective identifiers. When the first doze condition is evaluated in step 304 and the second doze condition is evaluated in step 406, all conditions evaluated based on the operation purpose identifier of the current frame are extended to conditions evaluated based on the identifiers for the operations above, more than one frame.

[0075] Fig. 5 is a schematic structural diagram of an AP apparatus according to an embodiment of the invention. As shown in Fig. 5, the apparatus AP comprises at least: a setup module 51 and a sending module 52. The specific operating process of the AP according to the embodiment of the invention may refer to the above technical solutions included in the embodiment 1 of the invention to the embodiment 4 of the invention.

[0076] The setup module 51 is configured to, based on whether the energy saving in the current TXOP and whether the STA station identifier is added again in the operation target identifier of the next frame for each frame in the current TXOP, set the TXOP power save display for each frame.

[0077] The sending module 52 is configured to send to the STA device at least one frame for the current TXOP, such that when the TXOP power save indicator is displayed;

- the current frame indicates that energy saving is allowed, the STA device determines whether to switch to the snooze state based on the snooze condition evaluation result.

[0078] Based on the above technical solutions, the setup module 51 is configured to, if energy saving is allowed in the current TXOP and no identifier of the STA is added again in the operation target of the next frame for the current frame for the current TXOP, setting the TXOP power save indication current frame for allowing energy saving or forbidding energy saving; if power save is not allowed in the current TXOP, set the TXOP power save indication of the current frame to prohibit saving energy; and if the identifier of the STA is added again in the operation target identifier of the next frame for the current frame for the current TXOP, setting the TXOP power save indication of the current power saving backup frame.

[0079] Based on the above technical solutions, the setup module 51 is configured to, if energy saving is allowed in the current TXOP and no identifier of the STA is added again in the operation target identifier of the next frame for the current frame for the current TXOP, setting the energy saving display A frame's TXOP at a predetermined position after the current frame to allow the saving of energy or to forbid saving energy; if power save is not allowed in the current TXOP, set the TXOP power save indication of the current power saving backup frame; and if the identifier of the STA is added again in the operation target identifier of the next frame for the current frame for the current TXOP,

[0080] On the basis of the above technical solutions, the set-up module 51 is configured to, if the operation view target frame identifier and the frame operation objective identifier in front of the current frame indicate the STA device for which it is required to transfer data in all frames after the current frame in the current TXOP, specifies that no identifier of the STA station is added again in the operation target identifier of the next frame after the current frame for the current TXOP. Or, the setup module 51 is configured to, if the operation target identifier of the current frame indicates an STA device for which it is required to transfer data in all data frames after the current frame in the current TXOP,

[0081] Based on the above technical solutions, the setup module 51 is also configured to, based on a predetermined number of times, when the TXOP power save indication value is changed in one TXOP, set the TXOP power save for each frame. And / or the setup module 51 is also configured to, based on the previously set form of changing the TXOP power save indication value in one TXOP, setting the TXOP power save display for each frame.

[0082] Based on the above technical solutions, the setup module 51 is configured to, based on a pre-set number of times, when the TXOP power save indication value is changed in one TXOP of one, TXOP power save setting for each frame. And / or the set-up module 51 is configured to, based on a previously set form, to change the TXOP power save indication value in the TXOP such that the TXOP power save indication of the previous frame for the current frame is forbidding power save, and a TXOP power save indication of the current indication frame, that energy saving is allowed, setting the TXOP power save indication, respectively, for each frame.

[0083] In an embodiment of the invention, only when both conditions that no identifier of the STA is added again and that energy saving is allowed are met, the AP setter module sets the TXOP power save indication of the frame or frame for the saving permission energy, such that the STA device determines whether the nap condition is evaluated based on the TXOP power save indication. Hence, in the event that the operation object identifier in the first TXOP frame does not include all STA devices associated with the TXOP, energy saving can still be performed, thereby extending the scope of the energy saving application and increasing the power saving effect.

[0084] Fig. 6 is a schematic structural diagram of an STA device according to an embodiment of the invention. As shown in Fig. 6, the STA device at least comprises: an acquisition module 61 and a control module 62. The specific operating process of the STA device according to the embodiment 6 of the invention may refer to the above technical solutions included in the embodiment 1 of the invention to the embodiment 4 of the invention.

[0085] The acquisition module 61 is configured to obtain the current frame for the current TXOP in which the current frame contains a TXOP power save indication set by the AP based on whether power saving is allowed at the current TXOP and whether the STA station identifier is again added in the operation target identifier of the next frame.

[0086] The control module 62 is configured to, when the TXOP power save indication of the current frame indicates that power saving is allowed, to control the STA device to determine whether to switch to the snooze state based on the snooze condition evaluation result.

[0087] Based on the above technical solutions, the control module 62 is also configured to, when the TXOP power save indication of the current frame is forbidding energy saving, controlling the STA device to maintain the awake state and controlling the acquisition module 61 to obtain the current frame for the current TXOP by using next frame as the current frame.

[0088] Based on the above technical solutions, the control module 62 is configured to, when the TXOP power save indication of the current frame indicates that power saving is allowed, judging whether the first doze condition is satisfied in each frame from the current frame to the last frame for the current TXOP, and if so, control the STA device for the snooze state; and if not, control the STA device to maintain the state of arousal. The first snoot condition includes that: the operation target identifier of the current frame does not include an indication for that STA device, or the operation target identifier of the current frame includes an indication for that STA device and an indication of the stream spatial multiplexing number for that STA is 0,

[0089] Based on the above technical solutions, the control module 62 is also configured to, when the TXOP power save indication of the current frame is forbidding energy saving, assessing whether the second snooze condition is met and recording the evaluation result. The second snoot condition includes: the job operation frame identifier of the current frame includes an indication for that STA device and that the spatial multiplexing stream number indication for this STA is 0, or the operation action frame identifier of the current frame includes an indication for that STA device and the STA receives more frames data whose data bit indices are 0. Or the second snooze condition indicates that: the partial AID indicated in the operation target of the current frame is the same as the partial AID of that STA device and the current frame is not sent to this STA,

[0090] Based on the above technical solutions, the control module 62 is also configured to, when the TXOP power save indication of the current frame indicates that power saving is allowed, judging whether the recorded result of the second nap condition assessment is satisfied or not met, and if the evaluation result is satisfied, controlling the STA device for the snooze state; if the result of the assessment is not met, assess whether the first nap condition is met.

In the embodiment of the invention, only when both conditions such that no STA identifier is added again and energy saving is allowed, the TXOP frame power save indications obtained by the STA obtaining module or the next frame for the frame indicate the saving permission energy; only when the TXOP power save indication of the current frame indicates that power saving is allowed, the STA device control module evaluates the snooze condition and determines

- 25 whether to enter the nap state based on the result of the nap condition evaluation. In this way, in the case where the operation object identifier in the first TXOP frame does not include all STA devices associated with the TXOP, the method can still realize energy saving, thereby extending the scope of the energy saving application and increasing the power saving effect.

[0092] In another embodiment of the invention, with respect to the disadvantage of the prior art, an embodiment of the invention suggests a method for energy saving, without changing the display setting method, lack of a TXOP PS for all frames in the same TXOP that is the same in the prior art, and on the basis of this description, by indicating whether the STA identifier is added again later in the TXOP frames, the scope of the energy saving method is extended. The details are set out in the following in the embodiment 7 to embodiment 11.

[0093] Fig. 7 is a flow diagram of an energy saving method according to the embodiment of the invention. As shown in Figure 7, the method includes the following procedure.

[0094] Step 701: The STA device obtains respectively a current frame and a preset transmission current transmission frame (abbreviated as TXOP) in which the current frame contains a consecutive STA indication and a TXOP power save indication and the pre-set frame includes the operation target identifier.

[0095] Step 702: When the TXOP power save indication of the current frame is allowed, the operation target identifier of the previously set frame does not include an indication for that STA device, and the next STA indication of the current frame is that the ST station identifier is added again later, this device STA goes into a state of nap.

[0096] Based on the above technical solutions, step 702 also includes: when the TXOP power save indication of the current frame is allowed, the operation target identifier of the pre-set frame does not include an indication for that STA device, and the subsequent STA indication of the current frame is that the STA station identifier is added again later, the STA device maintains the awake state.

[0097] In the embodiment 7 of the invention, the STA performs an evaluation based on three conditions, which are the TXOP power save indication, the next STA indication and the range covered by the operation objective indicator, and when the TXOP power save indication is enable, the next STA indication is that no identifier of the STA is added again later and the operation object identifier of the current frame does not include the identifier of that STA device, the STA device goes into the doze state. Thus, the method still applies to the case that the operation object identifier in the first TXOP frame does not include all STA devices associated with the TXOP, thereby extending the scope of the power saving application. Also,

According to the embodiment 7 of the invention, the STA device does not enter the doze state after receiving the first frame, and to receive the frame in which another indication of STA is that no identifier of the STA is added again later, the STA device begins to transition snooze, thus increasing the effect of energy saving.

[0098] Fig. 8 is a flow diagram of an energy saving method according to the embodiment of the invention. In particular, in the embodiment 8 of the invention, a further indication of STA is that no identifier of the STA is added again later (called no more STA indication), and if the indication is that no identifier of the STA station is added again later, yes, this indicates that no identifier of the STA station is added again later; if the indication that no identifier of the STA station is added again is no, it indicates that the identifier of the STA station is added again later. In the embodiment 8 of the invention, the TXOP power save indication is an indication of no TXOP power save, i.e. no TXOP PS indication, and when the absence of TXOP power save indication is yes, it indicates that power save is forbidden in the current TXOP; when the TXOP power save indication is no, it indicates that power saving is allowed in the current TXOP.

[0099] Furthermore, in the embodiment 8 of the invention, an indication that no identifier of the STA station is added again later and the no TXOP power save indication is indicated respectively by accepting bit 1. As shown in Figure 8, the method includes the following procedure.

[0100] Step 801: The AP device in each frame for the current TXOP sends an indication to the STA device that no identifier of the STA is added again later, the no TXOP power save indication, and the operation object identifier.

[0101] At this stage, the AP device directly provides the STA device with an indication that no identifier of the STA is added again later is yes or no and whether the no TXOP power save indication is yes or no, and the STA device identifier corresponding to the operation indicated by the STA. this frame. The TXOP includes one or more frames and the AP carries an indication that no identifier of the STA is re-added later, the TXOP power save indication and target operation identifier in the sequence preamble of each frame, and sends the preamble sequence to the STA device. Especially in the very high bandwidth A1 signal field (abbreviated as VHT-SIG-A1) of the preamble sequences of each frame, one bit is adopted to indicate no TXOP power save, and more than one bit was assumed to indicate the target identifier of the operation. For example, a reserved (abbreviated RSVD) VHT-SIG-A1 field bit is adapted to indicate that no STA identifier is added again later, and the bit is called the no more STA bit; when no more STA bit is 1, indicates that the indication that no new STA identifier is added later is yes, all STA devices associated with the current TXOP have been identified in the operation target IDs of the current frame and frames in front of the current frame, and no new ones

- the STA device is not indicated in each of the following frames for the current frame; when no more STA bit is 0, it indicates that the indication that no STA identifier is added again later is not, not all STA devices associated with the current TXOP are indicated in the operation target IDs of the current frame and frames before the current frame, and new the STA device is indicated in each of the following frames for the current frame. If no TXOP power save is indicated, the B22 bit of the VHTSIG-A1 field can be accepted for the no TXOP power save indication and the bit is called the TXOP TX shortage bit; if the bit is lacking, the TXOP is 0, it indicates that the TXOP power save indication is not, STA for this BSS can perform the energy saving operation, that is, the STA can be switched between the awake state and the snooze state; if the bit does not have the TXOP TX, it indicates that the TXOP power save indication is yes, the STA of this BSS is forbidden to carry out the power save operation. For the operation objective identifier, at least one bit in the VHT-SIG-A1 field can be used to indicate the operation objective identifier corresponding to the frame.

[0102] In the MU-MIMO mode, the operation object identifier is the group identity (abbreviated group ID). Before doing this energy saving method, the group ID is defined as a reserve by signaling and is set on the STA device. In particular, in the MU-MIMO mode, at least one MU-MIMO group is included in which each MU-MIMO group contains more than one STA device, typically four STA devices, and each of the above at least one MU-MIMO group is identified by the group ID. Before performing this energy saving method, the AP device sends the above group ID definition to each STA device via appropriate signaling; upon receipt of the above definition, each STA device writes a part corresponding to itself in the above definition so that when this energy saving method is performed, the AP device sends the operation operation identifier to the STA device, i.e. the group ID; after receiving the group ID, the STA device may know if the SAT device belongs to the MU-MIMO group indicated by the group ID based on the definition of the group ID stored in the STA device; if the STA device belongs to the MU-MIMO group indicated by the group ID, it indicates that the operation object identifier contains an indication for that STA device, and if the STA device does not belong to the MU-MIMO group indicated by the group ID, indicates that the operation target ID is not contains indications for this STA device. In SUMIMO mode, the operation objective identifier is a partial association identifier (abbreviated AID), the STA corresponding to the frame, or the operation objective identifier is the AID STA part corresponding to the frame, which is also referred to as the partial AID. A specific implementation method is that in SU-MIMO mode, AID creates 12 bits and the target operation identifier is 9 lower of the 12 bits of AID. If the AID or partial AID is the same as the AID of this STA device, it indicates that the operation object identifier contains an indication for that STA device, and if the AID or partial AID is different from the AID or partial AID of that STA device, indicates that the target identifier the operation does not contain an indication for this STA device.

[0103] Step 802: the STA device respectively acquires the current frame and the pre-set frame for the current TXOP, in which the current frame includes an indication that none

- 28 STA station identifier is not added again later and no TXOP power save indication, and the previously set frame contains the operation target identifier.

[0104] In this step, the STA device derives from the preamble of the frame sequence from the AP device the indication of the current frame that no identifier of the STA is added again later, the no TXOP power save indication of the current frame and the operation target identifier of the current frame. The pre-set frame may adopt two specific implementation methods, and in a first embodiment the pre-set frame is the current frame of the current TXOP; in the second embodiment, the pre-set frame is at least one frame from the first frame to the current frame for the current TXOP.

[0105] Step 803: The STA device judges whether the no TXOP power save indication of the current frame is yes or no, and if it is, the STA device maintains the awake state; if it is not, step 804 is executed.

[0106] In this step, if the no TXOP power save indication is yes, it indicates that the AP device prohibits the STA device from saving energy in the current TXOP, and therefore the STA device must maintain the wake up state. If the no TXOP power save indication is no, it indicates that the AP device allows the STA to realize power save in the current TXOP and the procedure proceeds to perform the next step 804.

[0107] Step 804: The STA device judges whether the first doze condition is met, and if so, the STA device goes into the Doze state; if not, the STA device maintains the awake state.

[0108] In this step, in the MU-MIMO mode, the first doze condition may comprise any of the following three conditions, or any combination thereof, and when one of the conditions is met, i.e. judging that the first doze condition is satisfied, the STA device goes into a nap; when all of the at least one condition included in the first snooze condition are unmet, judging that the first nap condition is unfulfilled, the STA device maintains the awake state. Three conditions may specifically include the following content. Condition 1: when the operation target identifier of the previously set frame does not include an indication for this STA device, and an indication of the current frame that no identifier of the STA station is added again later, the STA device goes into the doze state. Condition 2: when the target identifier of the previously set frame includes an indication for this STA device and the indication corresponding to the number of the spatial multiplexing flux is 0, the STA device goes into the doze state. Condition 3: when the operation target identifier of the previously set frame contains an indication for this STA device and the STA receives more data frames in which the data bits are 0, the STA device enters the snooze state.

[0109] In this step, in the SU-MIMO mode, the first doze condition may comprise a combination of one or more of the following three conditions, and when one of the conditions is met, i.e. judging that the first doze condition is satisfied, the STA device goes into nap status; when all of at least one condition included

- 29 in the first condition naps are unfulfilled, judging that the first nap condition is unfulfilled, the STA device maintains the awake state. Three conditions may especially include the following content. Condition 1: when the partial AID indicated by the operation target identifier of the previously set frame is different from the partial AID of this STA device and the indication of the current frame that no identifier of the STA is added again later is yes, the STA device goes into the doze state. Condition 2: when the partial AID indicated by the operation target identifier of the previously set frame is the same as the partial AID of this STA device, and the indication of the current frame that the STA station ID is added again later is yes, but the current frame is not sent to STA, the STA device goes into a dormant state. In particular, the STA device can in many ways judge whether the current frame is sent to this STA device, in which the specific method is that the STA device assesses whether the medium access control identifier (MAC is short) of the current frame coincides with that MAC identifier STA devices, and if so, the current frame is sent to this STA device; if not, the current frame is not sent to this STA device. Condition 3: when the operation target identifier of the previously set frame contains an indication for that STA device and the STA receives more data frames whose data bit indications are 0, the STA device enters the snooze state. whether the medium access control identifier (MAC is short) of the current frame coincides with the MAC identifier of that STA device, and if so, the current frame is sent to that STA device; if not, the current frame is not sent to this STA device. Condition 3: when the operation target identifier of the previously set frame contains an indication for that STA device and the STA receives more data frames whose data bit indications are 0, the STA device enters the snooze state. whether the medium access control identifier (MAC is short) of the current frame coincides with the MAC identifier of that STA device, and if so, the current frame is sent to that STA device; if not, the current frame is not sent to this STA device. Condition 3: when the operation target identifier of the previously set frame contains an indication for that STA device and the STA receives more data frames whose data bit indications are 0, the STA device enters the snooze state.

[0110] When step 804 is performed, the evaluation process according to an exemplary embodiment is as follows.

[0111] First step: The STA device judges whether the operation target identifier of the pre-set frame includes an indication for that STA device, and if so, a second step is performed; if not, the third stage is performed. In the first step, for the above two specific modes of implementing a pre-set frame, if the previously set frame is the current current frame of the TXOP, in a first step, it is judged whether the operation-frame identifier of the current frame includes an indication for that STA device; if the frame has previously been set from the first frame to the current frame for the current TXOP, the first step judges whether the operation target identifiers of the multiple frames from the first frame to the current frame include an indication for that STA device.

[0112] The second step: In the MU-MIMO mode, it is judged whether the spatial multiplexing stream number corresponding to that STA is 0, or whether the STA receives more data frames whose data bit indications are 0, and if so, the STA device goes into a nap; if not, the STA device maintains the awake state. In SU-MIMO mode, it is judged whether the current frame is sent to the STA device, or whether the STA receives more data frames whose data bit indications are 0, and if the current frame is not sent to that STA device or device STA receives more data frames whose data bit indicia is 0, the STA device goes into a snooze state; and if the current frame is sent to this STA device and this STA device receives more data frames, where the data bits are indicated by 1, the STA device maintains the awake state. In the second step, when the operation target identifier of the pre-set frame contains an indication for this STA device, the second condition

- 30 snooze in the existing energy saving method is adopted to assess whether the STA device goes into a dormant state. The determined rating for the second nap condition is the same as in the existing energy saving method, and is not repeated here.

[0113] Third step: The STA device judges whether for the current frame an indication that no identifier of the STA is added later is yes or no, and if it is so, the STA device goes into a dormant state; if it is not, the STA device maintains the awake state. In the third step, if the indication of the current frame that no STA identifier is re-added later is no, demonstrates that the re-added STA may occur in the next frame, and therefore to the current frame, the STA device still not included in the target ID the operation may still be used in the operation of the next frame, and therefore the STA device must maintain the awake state. If the indication of the current frame that no identifier of the STA station is added again later, then

[0114] In an embodiment of the invention, the AP device in each frame for the current TXOP sends an indication to the STA device that no identifier of the STA is added again later, the TXOP power save indication and target operation identifier; the STA device immediately obtains an indication of no TXOP power save from the AP and first assesses if power saving is allowed based on the TXOP power save indication, and then judges whether to enter the snooze state based on the operation objective identifier and indicating that no STA identifier it is not added again later sequentially when energy saving is allowed. For this reason, the method does not require that the operation object identifier in the first TXOP frame includes all STA devices associated with the TXOP,

[0115] Fig. 9 is a flow diagram of an energy saving method according to the embodiment of the invention. In an embodiment of the invention, the next indication of STA is to indicate that no identifier of the STA is added again later, and the TXOP power save indication is an indication of no TXOP power save is still taken as an example.

[0116] Furthermore, in an embodiment of the invention, to save signaling resources, the bit to indicate indication of no TXOP power save is no longer used, and the parties of communication may specify in advance that the no TXOP power save indication is no, i.e. energy saving it is by default allowed in the current TXOP, so that the bit is not required to be accepted for the execution of the indication, thereby saving bit signaling overhead. In particular, the method may adopt a method for determining a communication standard, it may be determined that in the communication standard the indication of no TXOP power save is no, or the indication indication information is missing

- 31 TXOP power savings are not related to the communication standard, i.e. they are equivalent to the standard permitting the saving of energy in the current TXOP by default. However, an indication that no identifier of the STA station is added again later still assumes the bit to implement the indication. As shown in Figure 9, the method includes the following procedure.

[0117] Step 901: the AP device in each frame for the current TXOP sends an indication to the STA device that no identifier of the STA station is added again later, and the operation object identifier.

[0118] In this step, a specific method in which the AP device in each frame for the current TXOP sends an indication to the STA device that no identifier of the STA is re-added later and the operation object identifier is the same as the method recorded in step 801 of the example. of the invention, and is not repeated here.

[0119] Step 902: The STA device respectively acquires the current frame and frame previously set for the current TXOP in which the current frame includes an indication that no identifier of the STA is added again later and the no TXOP power save indication and the previously set frame contains the identifier order of operation.

[0120] In this step, the STA device, based on the TXOP power save previously set, obtains that the no TXOP power save indication is no. The specific method in which the STA device obtains an indication of the current frame for the current TXOP that no identifier of the STA is re-added later and the operation target identifier of the pre-set frame is the same as the method recorded in step 802 of the embodiment 8 and is not here repeated.

[0121] Since this is equivalent to the fact that the communication parties have determined that the no TXOP power save indication is no, the STA does not need to evaluate the TXOP power save indication and the process can directly perform the following step 903.

[0122] Step 903: The STA device judges whether the first doze condition is met, and if so, the STA device goes into the Doze state; if not, the STA device maintains the awake state.

[0123] The specific method of this step is the same as the method recorded in step 904 in the embodiment 8 of the invention, and is not repeated here.

[0124] In an embodiment of the invention, through the method defined by the communication protocol, the parties of prior communication have determined that the no TXOP power save indication is no, i.e. the power saving in the current TXOP is allowed by default, so signaling overhead is saved and omitted there may be a step in which the STA device judges whether the no TXOP power save indication of the current frame is yes or no, thereby increasing the efficiency of the energy saving method more and increasing the energy saving effect.

[0125] In the embodiment 8 of the invention and embodiment 9 of the invention, an indication that no identifier of the STA is added again later and the no TXOP power save indication are only a specific way of implementing the corresponding STA indication and the TXOP power save indication respectively; technicians in the field may understand from the prior art that the indication that the identifier of the STA is added again later can also be taken to denote a further indication of STA; and when the indication that the identifier of the STA is added again later is yes, it indicates that the identifier of the STA is added again later; if the indication that the STA station identifier is added again later is no, it indicates that no identifier of the STA station is added again later. By means of the same symbol, the TXOP power save permission indication may also be accepted to indicate a TXOP power save indication when the indication of the TXOP power save permission is yes, it means that power save is allowed in the current TXOP; when the indication of the TXOP power save permission is no, it means that power saving is forbidden in the current TXOP.

[0126] Fig. 10 is a flow diagram of an energy saving method according to an embodiment of the invention. In an embodiment of the invention another indication of STA is to indicate that no identifier of the STA is re-added later, and the TXOP power save indication is an indication of the TXOP power save permission. Furthermore, in the embodiment of the invention, a bit is adopted for indicating at once that no identifier of the STA is added again later and the TXOP power save enable indication, thus saving the bit and saving signaling overhead. As shown in FIG. 10, the method includes the following procedure.

[0127] Step 1001: The AP device sends an indication to the STA device in each frame in the current TXOP that no identifier of the STA is added again later, the TXOP power save permission indication and the operation object identifier.

[0128] In this step, the specific method in which the AP device sends to the STA device the operation object identifier is the same as the method recorded in step 801 of the embodiment 8 of the invention. However, the AP device sends an indication to the STA device that no STA station identifier is re-added late and the TXOP power save enable indication taking the same bit. Especially an indication that no STA identifier is added again later and the TXOP power save enable indication includes a total of 1 bit, and when no STA station identifier is added again later and energy conservation is allowed in the current TXOP, the bit is yes, designated generally using the value 1; in any other case the bit is not, generally denoted by the value 0, for example: when the station identifier STA is added again later, regardless of whether power saving is allowed in the current TXOP, the bit is not; or when energy saving is forbidden in the current TXOP, regardless of whether the STA station ID is added again later, the bit is not.

[0129] Step 1002: The STA device derives the current frame and the pre-set frame for the current TXOP respectively, in which the current frame includes an indication that no STA identifier is added again later and the TXOP power save permission display and the previously set frame contains the ID of the operation objective.

[0130] Step 1003: The STA device judges whether the TXOP power save permission indication of the current frame being yes and an indication that no identifier of the STA station is being re-added later being met, and if so, step 1004 is performed; if not, the STA device maintains the awake state.

In this step, the STA device judges whether the above-mentioned 1 bit used to simultaneously indicate an indication that no identifier of the STA is added again later and the TXOP save power indication is yes or no, and if the bit is yes, it indicates that the indication of the TXOP power saving permission of the current frame being yes, and the indication that no identifier of the STA is added again later that are so fulfilled at the same time, energy saving may be realized and the procedure proceeds to the next step 1004; if the bit is not, it indicates that one of the conditions is unfulfilled, or none of the conditions is satisfied, and the STA device maintains the awake state.

[0132] Step 1004: the STA device judges whether the second doze condition is satisfied, and if it is, the STA device goes into the Doze state; if not, the STA device maintains the awake state.

[0133] In this step, the second doze condition may include two doze conditions in the prior art, i.e. it is not required to modify the snooze conditions in existing communication protocols, which allows more convenient to modernize and modify an existing communication device.

[0134] In particular, in the MU-MIMO mode, the second doze condition may comprise any of the following three conditions or any combination thereof, and when one of the conditions is satisfied, i.e. judging that the second doze condition is satisfied, the STA device goes into state snooze; when all of the at least one condition included in the second snooze condition are unsatisfied, judging that the second nap condition is unfulfilled, the STA device maintains the awake state. Three conditions may especially include the following content. Condition 1: when the operation target identifier of the previously set frame does not contain an indication for this STA device, the STA device enters the snooze state. Condition 2: when the operation target identifier of the previously set frame includes an indication for that STA device and an indication of the spatial multiplexing stream number, the corresponding STA is 0, the STA device goes into the Doze state. Condition 3: when the operation target identifier of the previously set frame contains an indication for this STA device and the STA receives more data frames in which the data bits are 0, the STA device enters the snooze state.

[0135] In this step, in the SU-MIMO mode, the second doze condition may comprise any of the following three conditions or any combination thereof, and when one of the conditions is

- 34 met, that is, judging that the second nap condition is met, the STA device goes into a nap state; when all of the at least one condition included in the second snooze condition are unsatisfied, judging that the second nap condition is unfulfilled, the STA device maintains the awake state. Three conditions may especially include the following content. Condition 1: when the partial AID indicated in the operation target identifier of the pre-set frame is different from the partial AID of this STA device, the STA device goes into the Doze state. Condition 2: when the partial AID indicated in the operation objective identifier of the current frame is the same as the partial AID of that STA device, but the current frame is not sent to this STA, the STA device goes into the Doze state. In particular, the STA device can evaluate in many ways, whether the current frame is sent to the STA device in which the specific implementation method is that the STA device judges whether the MAC identifier of the current frame overlaps the MAC identifier of that STA device and if so, the current frame is sent to that STA device; if not, the current frame is not sent to this STA device. Condition 3: when the operation target identifier of the pre-set frame contains an indication for that STA device, and STA receives more data frames whose data bit indicia is 0, the STA device goes into the doze state. if not, the current frame is not sent to this STA device. Condition 3: when the operation target identifier of the pre-set frame contains an indication for that STA device, and STA receives more data frames whose data bit indicia is 0, the STA device goes into the doze state. if not, the current frame is not sent to this STA device. Condition 3: when the operation target identifier of the pre-set frame contains an indication for that STA device, and STA receives more data frames whose data bit indicia is 0, the STA device goes into the doze state.

[0136] When step 1004 is performed, the evaluation process of the exemplary embodiment is as follows.

[0137] The first step: The STA device judges whether the operation target identifier of the pre-set frame includes an indication for that STA device, and if so, a second step is performed; if not, the STA device goes into a dormant state.

[0138] The second step: In the MU-MIMO mode, it is judged whether the indication of the spatial multiplexing number corresponding to that STA is 0, or whether the STA receives more data frames whose data bit indicia is 0, and if so, the STA device passes in a napping state; if not, the STA device maintains the awake state. In SU-MIMO mode, it is judged if the current frame is sent to this STA device, or it is judged whether the STA receives more data frames whose data bit indicia is 0, and if the current frame is not sent to that STA device or this STA device receives more data frames, which are indicated by the data bits 0, the STA device enters the snooze state; and if the current frame is sent to this STA device and this STA device receives more data frames,ą 1, the STA device maintains the awake state.

[0139] In an embodiment of the invention, 1 bit was adopted to simultaneously indicate the indication that no identifier of the STA is added again later and the TXOP power save enable indication, thereby saving an additional 1 signaling overhead.

[0140] Based on the above technical solutions recorded in the embodiment 7 of the invention to the embodiment 10 of the invention, in addition, the energy-saving method also includes the following step: the STA device sets the included

- 35 ID. The included identifier is used to indicate whether the STA device identifier is included in the operation target identifier of the pre-set frame, and the contained identifier is initially set to not. In particular, the STA device may accept a bit of the contained identifier, and during the initial set-up, the bit value is 0, as long as the operation object identifier includes the STA device identifier, the bit value corresponding to the included STA device ID is set to 1, and after receiving the next frame, the bit value is still maintained as 1. In the above three embodiments, the step of setting the included identifier for the STA device can be appropriately performed before or at the same time as the above step 701, step 801, step 901 and step 1002. After the STA device has the operation purpose identifier of the pre-set frame, the STA device judges whether the current included identifier is yes or no and if it is yes, the contained identifier is maintained as such; if it is not, it is assessed whether the operation object's current operation identifier contains the identifier of that STA device, and if so, the contained identifier is set to yes; otherwise, the contained identifier is maintained as no. At step 702, step 804, step 903, and step 1004, a specific method of evaluating whether the operation target identifier of the pre-set frame includes the identifier of the STA device includes: judging whether the included identifier is yes or no, where if the identifier included is yes, means this, that the identifier of this STA device is included in the operation target identifier of the previously set frame, and if the identifier included is no, it means that the identifier of that STA device is not included in the operation target identifier of the previously set frame. The method of setting the included identifier has been adopted, so that the step of assessing whether the operation target identifier of the pre-set frame contains the identifier of the STA device is simple, convenient and easy, thus increasing the efficiency of the evaluation processing.

[0141] Based on the above technical solutions recorded in the embodiment 7 of the invention to the embodiment of the invention, also, the energy saving method further comprises that: the STA device obtains information about the period of the current TXOP. In the above three embodiments, the step in which the STA device obtains information about the current TXOP period may suitably be performed before or at the same time as the above step 701, step 801, step 901, and step 1002. In step 702, step 804, step 903 and step 1004, after the STA device goes into a dormant state, and when the period of the current TXOP ends, the STA device goes into the awake state, thus ensuring that when the next TXOP arrives,

[0142] Fig. 11 is a flow diagram of an energy saving method according to the embodiment of the invention. The device in this embodiment may be STA in MIMO wireless communication. When the AP device device sends data or information to the STA device, the method of the above embodiment of the method is used. In a practical application, the parties to MIMO communication may be AP and STA, so that in various communications cases, the device may

- 36 be properly used as AP or STA. As shown in Fig. 11, the STA 110 device at least comprises: acquisition module 111 and control module 112, and may also include an identifier module 113.

[0143] The acquirer unit 111 is configured to obtain a respective current frame and a pre-set frame for the current TXOP, wherein the current frame includes a successive STA and a TXOP save indication, and the pre-set frame contains the operation object's identifier; the acquiring module 111 sends to the control module 112 a further STA indication of the current frame for the current TXOP, a TXOP power save indication of the current frame and a frame operation identifier of the previously set frame.

The control module 112 is configured to, based on the next STA indication of the current current frame TXOP, the TXOP power save indication of the current frame and the operation target identifier of the pre-set frame from the acquire module 111, control the STA device, and control the STA device to transition to the snooze state when the TXOP power save indication of the current frame is allowed, the operation target identifier of the current frame does not include an indication for that STA device, and the subsequent STA indication of the current frame is such that no STA identifier has been added again later.

[0145] Based on the above technical solutions, the control module 112 is also configured to control the STA device to maintain the awake state when the TXOP power save indication of the current frame is allowed, the operation target identifier of the previously set frame does not include an indication for that STA device, and subsequent the indication of the STA of the current frame is such that the identifier of the STA station is added again later.

[0146] Based on the above technical solutions, in particular, the acquiring module 111 may especially adopt any of the three methods below to obtain a further STA indication and a TXOP power save indication. In the first method, the acquisition module 111 is configured to obtain 1 information bit denoting successive STA indication and 1 information bit indicating the TXOP power save indication. Or, in the second method, the acquirer 111 is configured to obtain, based on the communication standard, 1 information bit indicating a consecutive STA indication and obtaining that the TXOP power save indication is a permit. Or, in a third method, the acquisition module 111 is configured to obtain 1 information bit denoting successive STA indication and a TXOP power save indication,

[0147] On the basis of the above technical solutions, in particular, the acquiring module 111 may especially adopt any of the following three methods to obtain the operation purpose identifier. In the first method, the acquirer 111 is

- configured to obtain the operation target ID of the current frame for the current TXOP. Or, in the second method, the acquirer 111 is configured to obtain the operation target identifier of the at least one frame from the first frame to the current frame for the current TXOP.

[0148] Based on the above technical solutions, the STA device may also include an identifier module 113. The identifier module 113 is configured to store and update the included identifier of the STA device. In particular, the acquirer 111 obtains the operation target identifier of the pre-set frame for the current TXOP and outputs the operation target identifier to the identifier module 113, the identifier module 113 is configured to judge whether the current included identifier is yes or no and if the current included identifier is yes, included the identifier is maintained as such; if it is not, it is assessed whether the operation object's current operation identifier contains the identifier of that STA device, and if so, the contained identifier is set to yes; otherwise, the contained identifier is maintained as no. Accordingly, the control module 112 is configured to judge whether the identifier stored in the identifier module 113 is yes or no, and if the identifier is yes, determining that the operation target identifier of the previously set frame includes an indication for that STA device, and if the identifier is not , specifying that the operation target identifier of the pre-set frame does not include an indication for that STA device.

[0149] Based on the above technical solutions, the acquisition module 111 is also configured to obtain information about the period of the current TXOP and sending period information to the control module 112. Accordingly, the control module 112 is also configured to control the STA device based on information about the current TXOP period. from the acquisition module 111, and in particular when the period of the current TXOP ends, the control module 112 controls the STA device for the transition to the awake state.

[0150] A specific method of operating the above modules of the STA device according to embodiment 11 may be implemented by adopting the energy saving method included in the embodiment 7 of the invention to the embodiment of the invention, and the technical solution not specified in the embodiment 11 may be implemented with reference to that which is recorded in the embodiment of the invention to the embodiment of the invention.

[0151] In embodiment 11 of the invention, the STA device obtains another STA indication and controls the STA device to enter the Doze state when the TXOP power save indication is enable, the next STA indication is that no STA identifier is added again later and the operation target identifier of the previously set frame does not contain the identifier of this STA device. Hence, if an energy saving method is adopted, the operation object identifier in the first TXOP frame is not required to include all STA devices associated with the TXOP, thus extending the scope of the energy saving method and increasing the power saving effect.

[0152] It should be noted that for the embodiment of the method, for the simplicity of the explanation, embodiments of the method have been described as a combination of a series of activities, but those skilled in the art should know that the invention is not limited to the sequence of operations, as some of the steps may, according to the invention, be implemented in a different order or simultaneously. Secondly, those skilled in the art should also be aware that all embodiments described herein are within the scope of the exemplary embodiments and that related activities and modules are not necessarily required by the invention.

[0153] A method for saving energy can be obtained by integrating the above embodiments, which includes the following steps.

[0154] S1101: Set the power save indication of the current data frame in which the power save indication is used to indicate that the STA receiving the current data frame is capable of allowing it to enter the power save state.

[0155] S1102: Send the current data frame in the current TXOP transmission capacity, such that the STA receiving the current data frame determines whether to switch to the snooze state based on the score evaluation for the snooze condition and the power save indication contained in the at least one data frame sent before the current data frame and sent in the TXOP is used to indicate that the STA is forbidden to realize energy saving.

[0156] In fact, the STA device is an STA device with the function of entering the doze state.

[0157] A specific method of setting the energy indication may include the following steps: if the power save indication of the previous frame for the current frame indicates that power saving is allowed, the power save indication of the current frame is set directly to the power save permission; or if the energy saving indication of the previous frame for the current frame is forbidding energy saving, it is judged whether the power save indication of the current frame is set to allow power saving based on whether the current TXOP allows energy saving and if the power saving permission is satisfied, the energy saving indication of the current frame is set to permit energy saving.

[0158] In addition, judging whether the power save indication of the current frame is set to allow power save based on whether the current TXOP allows energy saving, and if power saving is allowed, setting the power save indication of the current frame to permit power saving includes the following steps .

[0159] Based on whether energy saving is allowed in the TXOP, and whether the STA station identifier is added again in the operation target identifier of the next frame for the current data frame, it is judged whether the current energy save indication is set to permit power saving, and if power saving is allowed in the TXOP and no identifier of the STA is added again in the operation target identifier of the next frame for the current data frame, the power save indication of the current frame is set to permit power saving.

[0160] As an embodiment, if the energy saving indication in at least one data frame that is sent before the current data frame and is sent in the TXOP is 1, it indicates that the STA is forbidden to perform energy saving; if the energy saving indication of the current frame is 0, it indicates that the STA receiving the data frame is capable of allowing it to enter the power save state.

[0161] The energy saving indications in all data frames before the current data frame that are sent in the current TXOP transmission capability indicate that the STA is forbidden to realize energy saving, and power save indications in all subsequent data frames for the current data frame that are sent in the current TXOP indicate that STA can be allowed to go into a power save state.

[0162] In the above embodiments, the descriptions of the embodiments have different stresses. For parts not described in detail in a certain embodiment, references may be made to the corresponding descriptions in other embodiments.

[0163] It will be common to those skilled in the art that all or part of the steps of the method according to the embodiment may be implemented by a program instructing the respective equipment. The program can be saved on a computer readable data medium. When the program is executed, the steps of the method according to the embodiment are implemented. The storage medium may be any medium capable of storing the program code, such as read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk.

[0164] Also provided is an access point device that has the function of entering the doze state and includes:

a setting unit configured to set the power save indication of the current data frame in which the energy saving indication is used to indicate that the STA receiving the current data frame is capable of allowing it to enter the power save state; and a sending unit configured to send the current data frame in the current TXOP transmission capacity, such that the STA receiving the current data frame determines whether to switch to the snooze stand based on the evaluation result for the snoot condition in which the setting unit sets the current frame such that the save indication The energy contained in at least one data frame sent before the current data frame and sent in the TXOP is used to indicate the power saving forbidding.

[0165] The apparatus may end the processes of the method of the above steps S1101 to S1102, and may perform the functions of steps S1101 to S1102.

[0166] For example, the alignment unit, when setting the power save indication of the current data frame, directly sets the power save indication of the current frame to allow power save if the energy save indication of the previous frame for the current frame indicates that power save is allowed; or

- 40 if the energy saving indication of the previous frame for the current frame is forbidding energy saving, evaluates whether the power save indication of the current frame is set to allow power saving based on whether the current TXOP allows energy saving, and if the current TXOP allows saving energy, sets the power save indication of the current frame to permit saving energy.

[0167] Furthermore, the setting unit is configured to set the power save indication to 1 to indicate that the STA is forbidden to realize energy saving; and setting the energy saving display to 0 to indicate that the STA receiving the data frame allows energy saving.

[0168] In the SU-MIMO mode, the operation object identifier is the association identifier (abbreviated AID) of the STA binding identifiers corresponding to the frame and may be the identifier associated with the STA corresponding to the frame, and if it is the STA association identifier, only this STA is indicated; for example, the identifier of the STA association may be the MAC (medium access control) identifier of that STA, and the MAC identifier is also generally referred to as the MAC address.

[0169] Likewise, in the MU-MIMO mode, as described above, the operation operation identifier may be group ID, but is not limited to implementing the group ID adoption and may be any or multiple identifiers indicating several STAs; for example, in the MU-MIMO mode, the operation object identifier may also be implemented by using several MAC addresses associated respectively with several STAs, i.e. the operation objective identifier may also be several MAC addresses associated with several STAs, respectively.

[0170] In the embodiment 1 of the invention to embodiment 4 of the invention, when setting the TXOP power save indication, the AP may also limit the number of times the TXOP power save indication value changes and / or change the form of the TXOP power save indication.

[0171] Embodiment 12 is provided.

[0172] Step 1201: The AP device sends one or more frames for the current TXOP to the STA device. Each frame contains a frame operation objective identifier and a TXOP frame power save indication, and a TXOP power save save for each frame is set by the AP based on whether the STA station ID is added again in the operation target of the next frame for each frame in the current frame TXOP. Since the TXOP power save indication can only change once, the TXOP power save indication can only change from forbidding power save to allow energy saving if the TXOP power save indication is changed once and the TXOP power save indication is assumed to change in the K-th frame, the method of implementation is such that:

- 41 in all frames between the K-th frame and the last frame in the current TXOP, including the K-th frame and the last frame, i.e. in the frame (i.e. the K-th frame) in which the TXOP power save indication is changed and all frames of the current TXOP by frame (i.e., K-th frame), the AP device sets the TXOP power save indication value to indicate the TXOP power save permission, i.e. to 0.

[0173] Step 1202: The STA device obtains the current frame for the current TXOP in which the current frame contains the no TXOP power save indication of the frame and the target operation frame identifier.

[0174] Step 1203: The STA device judges whether the no TXOP power save indication of the current frame is yes or no, and if it is not, step 1204 is executed; if it is so, the STA device maintains the awake state and the STA device uses the next frame as the new current frame, and returns to step 1202.

[0175] Step S1204: In each frame from the current frame to the last frame for the current TXOP, the STA device judges whether the first doze condition is met, and if it is, the STA device goes into the Doze state; if not, the STA device maintains the awake state. In this step, the snooze conditions existing in the communication protocol based on the first doze condition are not required, thus making modifying and changing the existing communication device more convenient.

[0176] As described in embodiment 4, in the MU-MIMO mode, the second doze condition may comprise a combination of one or both conditions, and in SU-MIMO mode, the second doze condition may include a combination of one or both conditions. The implementation of embodiment 1 of embodiment 4 may be such that: in the MU-MIMO mode, the second snooze condition comprises at least one of the two conditions, and in the SU-MIMO mode, the second snooze condition comprises at least one of the two conditions, i.e. in MU-MIMO mode and in SU-MIMO mode, the second snooze condition is that: the operation target ID of the current frame contains an indication for that STA device and this STA receives more data frames whose data bits are 0, which is equivalent to the second the snooze condition is that the STA device takes more data frames, whose data bit indications are 0, and which are sent to this STA, and responds to the data frame with the appropriate ACK. Implementation of embodiment 2 of embodiment 4 may be such that: in the MU-MIMO mode, the second doze condition includes two conditions, and in the SU-MIMO mode, the second doze condition includes the last of two conditions, which is equivalent to the second doze condition adopted in the implementation 1 of the above embodiment 4, the first condition in the MU-MIMO mode is added such that the second doze condition in the MU-MIMO mode and the SU-MIMO mode can comprehensively mean that the following: condition 1 and condition 2 are included.

[0177] Condition 1: the group identity (i.e., group ID) of the current frame includes an indication for this STA device and an indication of the stream multiplexing number corresponding to that STA is 0.

[0178] Condition 2: The operation target identifier of the current frame includes an indication for this STA device, and STA receives more data frames whose data bit indication is 0, which is equivalent to the STA device receiving more data frames that are the data bit indication is 0, which is sent to this STA device, and responds to the data frame with the appropriate ACK.

[0179] A more detailed method of implementing the energy saving method of the above embodiment 12 is as follows and is recorded as an embodiment 13.

[0180] Step 1301: The AP device sends one or more frames for the current TXOP to the STA device. Each frame contains: the frame operation objective identifier and the TXOP frame power save indication and no TXOP power save indication for each frame is set by the AP based on whether the STA station ID is added again in the operation target of the next frame for each frame for the current frame TXOP. When the TXOP power save indication is changed once and the TXOP power saving indication is assumed to change in the K-th frame, the embodiment is such that: in all frames between the first frame and the K-1 frame of the current TXOP, in this first frame and the K-1th frame, i.e. in all frames of the current TXOP in front of the frame (i.e. the K-th frame), where the TXOP power save indication is changing, the AP device sets the TXOP power save indication value to the power saving prohibit indication, i.e. to 1; in all frames between the K-th frame and the last frame for the current TXOP, including the K-th frame and the last frame, it is in the frame (that is the K-th frame), where the indication of the lack of TXOP power saving changes and in all frames the current TXOP by frame (i.e., K-th frame), the AP device sets the TXOP power save indication value to indicate the power-saving permission, i.e. at 0.

[0181] In the same TXOP, the TXOP power save indication for each frame is set by the AP based on whether power saving is allowed at the current TXOP, and whether the STA with the snooze feature is added again in the operation target ID of the next frame for the frame. In particular, the AP may adopt the above second method of assessing whether the STA with the snooze function is added again in the operation target identifier of the next frame for each frame for the current TXOP, i.e. it is judged whether the operation target of the current frame indicates the STA device with the function going into a snooze state, for which it is required to transfer data in all frames after the current frame in the current TXOP, and if so, he indicates that no data is sent to the new STA device in each subsequent frame for the current frame, the condition that no identifier of the STA station is added again later is satisfied in the current frame; otherwise, the condition that no STA identifier is added again later is not met in the current frame. It can be easily seen that the above condition that no STA identifier is added again later is satisfied in the current frame, which is equivalent to: in the current TXOP, in each subsequent frame for the current frame, an STA device with a state transition function that no STA station identifier is added again later is unfulfilled in the current frame. It can be easily seen that the above condition that no STA identifier is added again later is satisfied in the current frame, which is equivalent to: in the current TXOP, in each subsequent frame for the current frame, an STA device with a state transition function that no STA station identifier is added again later is unfulfilled in the current frame. It can be easily seen that the above condition that no STA identifier is added again later is satisfied in the current frame, which is equivalent to: in the current TXOP, in each subsequent frame for the current frame, an STA device with a state transition function

- 43 snooze to which the AP transmits data may be one of several STA devices that are indicated by the operation target identifier of the current frame.

In this embodiment, the method for setting the TXOP power save indication is exhaustively described as follows: if the TXOP power save indication of the previous frame for the current frame is set to allow power save, the TXOP power save indication of the current frame can be set to allow power save ; if the TXOP power save indication of the previous frame for the current frame is set to prohibit power save, the TXOP power save indication of the current frame can be set to allow power save or to prohibit energy saving. When the TXOP power save indication of the current frame can be set to allow power saving or forbid save power, only when energy saving is allowed in the current TXOP and no STA is added again later both are satisfied, the TXOP power save indication of the current frame for the current TXOP can be set to allow power saving. If power conservation is not allowed in the current TXOP, the TXOP power save indication of the current frame for the current TXOP can be set to forbid power save.

[0183] Step 1302: The STA device obtains the current frame for the current TXOP in which the current frame contains the no TXOP power save indication and the target operation frame identifier.

[0184] Step 1303: The STA device judges whether the no TXOP power save indication of the current frame is yes or no, if it is not, step 1304 is performed; if it is so, the STA device maintains the wake-up state and accordingly it is not required to judge whether the nap condition is satisfied and the STA device uses the next frame as the new current frame, and returns to step 1302.

[0185] Step 1304: In each frame from the current frame to the last frame for the current TXOP, i.e. in the frame in which the no TXOP power save indication in the current TXOP is no, the STA device judges whether the third doze condition is met, and if yes, the STA device can go into a napping state; if not, the STA device maintains the awake state. Several STAs after receiving a data frame sent to them in each frame in which the TXOP power save indication value is a TXOP power save prohibition indication evaluates whether the third snooze condition is met, and if so, the STA device goes into a snooze state; if not, the STA device maintains the awake state. The third condition may include any of the following four conditions, or any combination thereof, and when one of the conditions is met, that is, judges that the third nap condition is met, the STA device can go into a napping state; when all of at least one condition contained in the third nap condition is not met, judging that the third nap condition is not met, the STA device maintains the awake state. Four conditions may especially include the following content.

[0186] Condition 1: The group identity (i.e., group ID) of the current frame does not include an indication for this STA device.

[0187] Condition 2: The partial AID indicated in the operation target identifier of the current frame is different from the partial AID of this device, or the current frame is not sent to this STA.

[0188] Condition 3: The group identity (i.e., group ID) of the current frame includes an indication for this STA device and an indication of the stream number for spatial multiplexing corresponding to this STA is 0.

[0189] Condition 4: This STA device receives more data frames whose data bit indicia is 0 that is sent to that STA device and responds to the data frame of the corresponding ACK.

[0190] The method for saving energy according to the above embodiment 13 can be further optimized, such that embodiment 14 is maintained.

[0191] Step 1401: The AP device sends one or more frames for the current TXOP to the STA device. Each frame contains: the frame operation objective identifier and the TXOP frame power save indication and no TXOP power save indication for each frame is set by the AP based on whether the STA station ID is added again in the operation target of the next frame for each frame for the current frame TXOP. When the TXOP power save indication is changed once and the TXOP power saving indication is assumed to change in the K-th frame, the embodiment is such that: in all frames between the first frame and the K-1 frame of the current TXOP, in this first frame and the K-1th frame, i.e. in all frames of the current TXOP in front of the frame (i.e. the K-th frame), where the TXOP power save indication is changing, the AP device sets the TXOP power save indication value to the power saving prohibit indication, i.e. to 1; in all frames between the K-th frame and the last frame for the current TXOP, including the K-th frame and the last frame, it is in the frame (that is the K-th frame), where the indication of the lack of TXOP power saving changes and in all frames the current TXOP by frame (i.e., K-th frame), the AP device sets the TXOP power save indication value to indicate the power-saving permission, i.e. at 0.

[0192] In the same TXOP, the TXOP power save indication for each frame is set by the AP based on whether power saving is allowed at the current TXOP, the above restrictions and and ii, and whether the STA with the function of entering the Doze state is again added in the operation target ID of the next frame for the frame. The method in which the AP judges whether the STA with the snooze function is added again in the operation target identifier of the next frame for each frame for the current TXOP includes: evaluating if several STA devices that are indicated by the operation target identifier of the current frame and several STA devices to which AP once transmits data in each frame before the current frame include an STA device with the function of entering the state of a nap,

- a frame in the current TXOP, and if so, indicates that no data is sent to the new STA device in each subsequent frame for the current frame, the condition that no identifier of the STA is added again later is satisfied in the current frame; otherwise, the condition that no new STA identifier is added again later is not met in the current frame. It can be easily seen that the above condition that no STA identifier is added again later is satisfied in the current frame, which is equivalent to: in the current TXOP, in each subsequent frame for the current frame, an STA device with a state transition function the snooze to which the AP transmits data may be one of several STA devices that are indicated by the operation target identifier of the current frame,

[0193] In this embodiment, the method for setting the TXOP power save indication is exhaustively described as follows: based on the above restrictions i and ii, if the TXOP power save indication of the previous frame for the current frame is set to enable power save, the TXOP power save indication of the current the frame can be set to permit energy saving; if the TXOP power save indication of the previous frame for the current frame is set to prohibit power save, the TXOP power save indication of the current frame can be set to allow power save or to prohibit energy saving. When based on the above restrictions i and ii, the TXOP power save indication of the current frame can be set to allow power save or power save, only if power save is allowed in the current TXOP and no STA is added again later both are satisfied, the TXOP power save indication of the current frame for the current TXOP can be set to allow energy saving. If power conservation is not allowed in the current TXOP, the TXOP power save indication of the current frame for the current TXOP can be set to forbid power save.

[0194] Step 1402: The STA device obtains the current frame for the current TXOP in which the current frame contains the no TXOP power save indication and the target operation frame identifier.

[0195] Step 1403: The STA device judges whether the no TXOP power save indication of the current frame is yes or no, if it is not, step 1404 is performed; if it is so, the STA device maintains the wake-up state and it is not required to judge whether the nap condition is satisfied and the STA device uses the next frame as the new current frame, and returns to step 1402. In addition, the STA also performs the following operations: evaluation, whether the AP transmits the data to itself in the current frame, i.e. assessing whether the AP is sending a data frame whose MAC address (also referred to as a MAC identifier) ​​of the receiving side is the same as the MAC address of that STA device to that STA device in the current frame, and if so, the STA device saves this state, i.e. it records the state that the data frame sent to itself is once received in the frame,

- 46 display value lack of TXOP energy saving is an indication of forbidding energy saving.

[0196] Step 1404: In each frame from the current frame to the last frame for the current TXOP, i.e. in the frame in which the no TXOP power save indication in the current TXOP is no, several devices once receiving a data frame sent to them in each frame, in which the TXOP energy saving indication value is an energy saving prohibition indication, judge whether the fourth snooze condition is met, and if so, the STA device may go into a dormant state; if not, the STA device maintains the awake state. However, other STA devices instead of several STA devices that once receive a data frame sent to each other in each frame in which the indication value of the lack of TXOP power save is an indication of the power saving prohibition, i.e. STA devices that never receive a data frame sent to them in each data frame in which the TXOP power save indication value is an energy saving prohibition indication, judge whether the third nap condition is met, and if present, the STA device goes into a snooze state; if not, the STA device maintains the awake state. The fourth of the snooze conditions, i.e. the last condition of the four conditions included in the third nap condition, is that: the STA device receives more data frames whose data bit indicia is 0 that is sent to that STA device and responds to the data frame appropriate ACK. the STA device goes into a dormant state; if not, the STA device maintains the awake state. The fourth of the snooze conditions, i.e. the last condition of the four conditions included in the third nap condition, is that: the STA device receives more data frames whose data bit indicia is 0 that is sent to that STA device and responds to the data frame appropriate ACK. the STA device goes into a dormant state; if not, the STA device maintains the awake state. The fourth of the snooze conditions, i.e. the last condition of the four conditions included in the third nap condition, is that: the STA device receives more data frames whose data bit indicia is 0 that is sent to that STA device and responds to the data frame appropriate ACK.

[0197] In step 1404, several STA devices once receiving a data frame sent to them in each frame in which the TXOP power save indication value is an indication of power saving prohibition adopt the fourth snooze condition.

[0198] In embodiment 14, step 1404 can only be modified to provide another embodiment of the invention, i.e. the fourth doze condition in step 1404 is converted into a fifth doze condition, i.e. several STA devices once receiving a data frame sent to them in each frame in which the TXOP power save indication value is an energy saving prohibition indication, evaluates whether the fifth doze condition is met, and if it is, the STA device goes into a dormant state; if it is not, the STA device maintains the awake state. However, the fifth doze condition may include any of the following two conditions, or any combination thereof, and when one of the conditions is met, i.e. judging that the fifth doze condition is satisfied, the STA device may enter the doze state; when all of the at least one condition included in the fifth condition of naps are unfulfilled, judging that the fifth condition of the nap is unfulfilled, the STA device maintains the awake state. However, two conditions, i.e. the last two conditions of the four conditions included in the third doze condition, are: condition 1: the identity of the group (i.e. group ID) of the current frame includes an indication for this STA device and the indication of the spatial multiplexing number corresponding to that STA is 0 ; and condition 2: this STA receives more data frames whose data bit indications are 0 that are sent to this STA device, and responds to the data frame of the corresponding ACK. However, two conditions, i.e. the last two conditions of the four conditions included in the third doze condition, are: condition 1: the identity of the group (i.e. group ID) of the current frame includes an indication for this STA device and the indication of the spatial multiplexing number corresponding to that STA is 0 ; and condition 2: this STA receives more data frames whose data bit indications are 0 that are sent to this STA device, and responds to the data frame of the corresponding ACK. However, two conditions, i.e. the last two conditions of the four conditions included in the third doze condition, are: condition 1: the identity of the group (i.e. group ID) of the current frame includes an indication for this STA device and the indication of the spatial multiplexing number corresponding to that STA is 0 ; and condition 2: this STA receives more data frames whose data bit indications are 0 that are sent to this STA device, and responds to the data frame of the corresponding ACK.

[0199] In embodiments of the present application document, if the STA device judges that the STA device can switch to a snooze state based on the nap condition, the STA device maintains the snooze state to the end of the TXOP. When the TXOP starts, the NAV (network allocation vector) is carried in at least one frame sent by the AP, the NAV indicates a time period and during this time period all STAs without the TXOP control right are not able to actively initiate data transmission; in this way, the NAV sets the duration of the TXOP, and in practice, when the TXOP starts, the duration of the TXOP set by the AP may change in the TXOP, and may be implemented by the frame transmitting the new NAV and sent by the AP; the TXOP end time indicated by the new NAV is different from the TXOP end time previously set by the NAV sent by the AP.

[0200] In the embodiments of this application document, the following step 1501 may be added for each STA device to avoid that the STA occupies a wireless channel upon switching to the awake state interfering with the communication performed by other users.

[0201] Step 1501: Any STA device snoozing the end of this TXOP, after the snooze state has ended and the wake-up state is not able to use the transmission medium (to access the medium), i.e. it is unable to occupy the wireless channel to send information to at least one of the following three conditions. Condition 1. The STA device receives the frame and the frame sets its own NAV.

[0202] Condition 2. The STA device correctly decodes the L-SIG field (i.e., the Non-HT Signal field, also called the Legacy Signal field) contained in the frame and the frame supports the mechanism

L-SIG TXOP protection (this is the L-SIG TXOP protection). Condition 3. By performing a CCA (clean channel evaluation, i.e. a channel not using the condition evaluation), the STA device determines that in a given time period the T15 channel, i.e., the transmission medium, is in the idle state. T15 is the value of the length of the period of time, for example it may be

0.5 milliseconds or 0.9 milliseconds; CCA is an existing technology, i.e. an STA device obtains access to power received on a channel, and when this power is less than a given value, it is considered that the channel is in an idle state.

[0203] Another embodiment may further be for condition 2 of the above step 1501, wherein the STA correctly decodes the L-SIG field included in the frame; and when the frame does not support the L-SIG TXOP protection mechanism, and only after the end of the period of time protected by the L-SIG field, and when the given time period T2 has expired, the STA device may use the transmission medium; however, when the frame supports the L-SIG TXOP protection mechanism, and at the end of the period of time protected by the L-SIG field, the STA device may use the transmission medium. The fact that an STA device can use a transmission medium does not mean that the STA device definitely uses a transmission medium. When the STA device can use a transmission medium, in general the STA device must compete for the right to the transmission medium, and only after obtaining the right to use the medium

- 48 transmission in competition, the STA device uses the transmission medium; many embodiments may occur for a given period of time T15b, and for example T15b is equal to the length of the ACK frame plus the length of two SIFS times (short gaps between frames), or is equal to the length of the ACK frame plus the SIFS length plus the PIFS length (distances between PFC frames).

[0204] From the above step 1501, it can be seen that after the snooze state and wakeup state, if the STA device snooze the end of this TXOP can immediately receive the frame and the frame sets its own NAV, the STA device can use the transmission medium very fast.

[0205] For this reason, the following steps can be added for the AP device and the AP device sends a frame after the TXOP end to allow the STA device to switch to the waking state for the NAV setting, and the specified method is as follows.

[0206] Step 1601: After this TXOP has completed and the time T16 interval has elapsed, the AP device sends a frame to each STA device, and the frame carries NAV. The time interval T6 has several possible implementation methods, which, for example, can be SIFS or PIFS; the NAV value carried over the frame has several possible implementation methods, which, for example, may be zero or protection only until the frame ends; the frame has several possible modes of implementation, which e.g. may be the CF_End frame in the prior art, and the NAV value carried by the CF_End frame is a value of zero; the moment occurring after the end of this TXOP and the passing of the time interval T16 is the moment which is after the time the TXOP ends, and the time interval between the moment and the time when the TXOP ends is T16.

[0207] Step 1602: After the snooze state and wakeup state, each STA device snooze the end of this TXOP receives the frame sent by the AP device after the TXOP has finished and after the time T16 passes, and the frame sets its own NAV, which is in accordance with condition 1 in step 1501; accordingly, after the frame is finished, the transmission medium can be used. Especially when the frame sent by the AP device in step 1601 is the CF_End frame, each STA understands the received CF_End frame as a NAV reset, i.e. when the above CF_End frame ends, each STA device resets its own NAV clock to zero.

[0208] In the above steps 1601 and 1602, the CF_End frame can only be accepted for execution, and the SIFS can be specified for use at the T16 time interval, and the corresponding steps are as follows:

Step 1701: After completing this TXOP and passing the SIFS time interval, the AP sends the CF_End frame to each STA device and the NAV value carried in the CF_End frame is zero.

[0209] Step 1702: After the snooze state and wakeup state, each STA device snooze until the end of this TXOP receives the CF_End frame sent by the AP after finishing this TXOP and then passes the SIFS time interval and the received CF_End frame is understood as a NAV reset, that is at the moment

- the end of the CF_End frame, each STA device resets its own NAV clock to zero; the transmission medium may be used appropriately.

[0210] In the above embodiments, after entering the Doze state, the STA device maintains the Doze state until the end of this TXOP. However, embodiments of the invention are not limited to the above embodiments; for example, if the STA device judges that the STA device can transition to the snooze state based on the nap condition, the STA device maintains the snooze state until the end of this TXOP; in the meantime, during the period of time the STA device maintains the snooze state, at several points determined in advance, the STA device wakes up and maintains the waking state over a period of time, and then again goes into the doze state; or if the STA device judges that the STA device can enter the doze state based on the nap condition, the STA device maintains the snooze state until the end of this TXOP.

[0211] A further embodiment as provided in the following description is provided and recorded as embodiment 18.

[0212] Step 1801: At the current TXOP, each STA device judges whether the STA device can enter the doze state. If the STA device judges that the STA device can enter the Doze state, the STA device maintains the Doze state until before the time the TXOP ends, and is switched to the awake state at this time. The time interval between the moment when the STA device ends the snooze state and is switched into the awake state and the moment when this TXOP ends is equal to the value determined in advance by the parties involved in communication, or is in the range determined in advance by the parties involved in the communication. After switching to the snooze state, the STA device receives the frame sent by the AP, then updates its own NAV setting based on the NAV carried in the frame sent by the AP,

[0213] In the time interval between when the STA ends the snooze state and is switched into the wake up state in step 1801 and the end time of that TXOP, or in the time range after the STA ends the snooze state and is switched into the wake-up state in step 1801 and the time interval T18, or in the time range before the TXOP time ends and the AP device sends one or more frames to several STA devices, the frame carries the NAV for the time indication when the TXOP ends, or the L-SIG field of the frame moves the indication the time provided for the STA device to update its own NAV setting, or the frame carries at least one bit used to indicate if the time at which this TXOP ends is the same as the end time of that TXOP set by the AP at the beginning of the TXOP. The distance T18 of this stage has many possible ways of realizing it,

[0214] In the above embodiment 18, also at least one frame sent over a time range by an AP device to STA devices may satisfy at least one of the four following features: at least one frame sent over a time range by the AP to several devices STA is not sent by the beam forming method; NAV carried in at least one frame sent in the time range by the AP to several STA devices is not sent by the beam forming method; in at least one frame sent in the time range by the AP device to several STA devices, the L-SIG field of the frame is not sent by the beamforming method; in at least one frame sent over a period of time by the AP device to several STA devices, at least one bit carried by the frame to indicate if time,

[0215] Below are examples of a method and apparatus for energy saving.

[0216] Example 1: A method of energy saving comprising:

setting the power save indication of the current data frame in which the power saving setting is used to indicate that the STA receiving the current data frame may be allowed to enter the power save state; and sending the current data frame in the current TXOP transmission capacity, such that the STA receiving the current data frame determines whether to snooze based on the evaluation result for the snooze condition and the power save indication contained in at least one data frame sent before the current data frame sent. in TXOP it is used to indicate power saving forbidding, wherein STA is an STA device with the function of entering the state of a snooze.

[0217] Example 2: The method of example 1, wherein setting the power save indication of the current data frame includes:

if the indication of the previous frame for the current frame indicates that energy saving is allowed, set the current frame energy save indication to allow energy saving.

[0218] Example 3: The method of example 1, wherein setting the power save indication of the current data frame includes:

if the indication of the previous frame for the current frame indicates that power saving is forbidden, evaluating whether the current power save indication is set to allow power save based on whether the current TXOP allows power save, and if the current TXOP allows saving energy, setting energy saving current frame indication for allowing energy saving.

[0219] Example 4: The method of example 3, wherein judging whether the power save indication of the current frame is set to allow power save based on whether the current TXOP allows power save, and if the current TXOP

- 51 allows for saving energy, setting the energy saving display of the current frame to permit energy saving includes:

based on whether power saving is allowed in the TXOP, and whether the STA identifier is added again in the operation target identifier of the next frame for the current data frame, judging whether the current energy frame indication is set to allow power save, and if the power saving is allowed in the TXOP and no identifier of the STA station has been added again in the operation target identifier of the next frame for the current frame, setting the power save indication of the current frame to permit saving energy.

[0220] Example 5: A method according to any one of Examples 1 to 4 comprising: if the energy saving indication in at least one data frame sent before the current data frame and sent in the TXOP is 1, indicating that the STA is forbidden to realize energy saving; if the energy saving indication of the current frame is 0, indicating that the STA receiving the data frame may be allowed to enter the power saving state.

[0221] Example 6: A method according to any one of Examples 1 to 5, wherein the energy saving indications in all data frames before the current data frame sent in the current TXOP transmission capacity indicate that the STA is forbidden to realize energy saving, and energy saving indication in all subsequent data frames for the current data frame that are sent in the current TXOP indicate that the STA is capable of allowing it to go into a power save state.

[0222] Example 7: An access point device with a snooze feature, including:

a setting unit configured to set the power save indication of the current data frame in which the energy saving indication is used to indicate that the STA receiving the current data frame is capable of allowing it to enter the power save state;

a sending unit configured to send the current data frame at the current TXOP transmission opportunity, such that the STA receiving the current data frame determines whether to switch to the snooze stand based on the evaluation result for the snooze condition, the setting unit setting the current frame so that the energy saving indication contained in at least one data frame sent before the current data frame and sent in a TXOP is used to indicate the prohibition of power saving.

[0223] Example 8: An access point device according to example 7, wherein when the setting unit sets the power save indication of the current data frame, if the energy saving indication of the previous frame for the current frame indicates that power saving is allowed, the power save indication of the current frame is directly set to permit energy saving; or

- 52 if the energy saving indication of the previous frame for the current frame is forbidding energy saving, it is judged whether the energy saving current frame indication is set to allow energy saving based on whether the current TXOP allows energy saving and if the current TXOP allows saving energy, the energy saving indication of the current frame is set to permit energy saving.

[0224] Example 9: An access point device according to example 7 or 8, wherein the setting unit is configured to set the power save indication to 1 to indicate a power saving prohibition; and setting the energy saving display to 0 to indicate the energy saving permission.

[0225] Example 10: a method of energy saving, comprising:

based on whether energy saving is allowed in the current TXOP transmission capacity, and whether the STA station identifier is added again in the operation target identifier of the next frame for each frame for the current TXOP, respectively setting the TXOP power save indication for each frame, where STA is STA with the function of entering the state of a nap;

sending at least one frame for the current TXOP to the STA device such that when the TXOP power save indication of the current frame indicates that power saving is allowed, the STA device determines whether to switch to the snooze state based on the evaluation result for the snooze condition, and the STA device is a device STA with the function of entering the state of a nap.

[0226] Example 11: The method of example 10, wherein the STA being STA with the function of entering the doze state comprises: STA is STA with the function of entering the doze state and maintaining the state of the snooze until the current TXOP ends; and the device being an STA device with the function of entering the doze state comprises: the STA device is a device with the function of entering the state of a snooze and maintaining the state of the snooze until the end of the current TXOP.

[0227] Example 12: A method according to example 11, wherein based on whether an energy saving is allowed in the current TXOP and whether the STA station identifier is added again in the operation target identifier of the next frame for each frame in the current TXOP, the corresponding saving display setting TXOP power for each frame includes:

if power saving is allowed in the current TXOP and no identifier of the STA is added again in the operation target identifier of the next frame for the current frame for the current TXOP, setting the TXOP power save indication of the current frame to allow power saving or forbidding energy saving; if power save is not allowed in the current TXOP, set the TXOP power save indication of the current frame to forbid save power; and

- 53 if STA is added again in the operation target identifier of the next frame for the current frame for the current TXOP, set the TXOP power save indication of the current frame to forbid save power.

[0228] Example 13: The method of example 12, wherein, based on whether energy saving is allowed in the current TXOP and whether the STA station identifier is added again in the operation target identifier of the next frame for each current frame of the current TXOP, the display is set accordingly TXOP power saving for each frame includes:

if energy saving is allowed in the current TXOP and no identifier of the STA station is added again in the operation target ID of the next frame for the current frame for the current TXOP, setting the TXOP frame power save indication in the preset position after the current frame to allow saving power or forbidding saving energy;

if power save is not allowed in the current TXOP, set the TXOP power save indication of the current frame to forbid save power; and if the identifier of the STA is added again in the operation target identifier of the next frame for the current frame for the current TXOP, setting the TXOP power save indication of the current power saving backup frame.

[0229] Example 14: A method according to example 12 or 13, wherein no STA being added again in the operation target identifier of the next frame for the current frame for the current TXOP includes:

the operation target identifier of the current frame and the operation target identifier of the frame in front of the current frame indicate the STA device for which it is required to transfer data in all frames after the current frame in the current TXOP;

or the operation target identifier of the current frame includes an STA device required to transfer data in all frames after the current frame in the current TXOP.

[0230] Example 15: The method of example 14, wherein, based on whether energy saving is allowed in the current TXOP and whether the STA station identifier is added again in the operation target identifier of the next frame for each current frame of the current TXOP, the corresponding display setting TXOP power saving for each frame includes:

based on a predetermined number of times, when the TXOP power save indication value is changed in one TXOP, appropriate TXOP power save setting for each frame;

or, based on the previously set form of changing the TXOP power save indication value in one TXOP, the appropriate TXOP power save indication setting for each frame.

[0231] Example 16: The method of example 15, wherein

- 54 pre-set number of times when the TXOP power save indication value is changed in one TXOP is once;

or the pre-set form of changing the TXOP power save indication value in one TXOP is such that: the TXOP power save indication of the previous frame for the current frame is forbidding power save, and the TXOP power save indication for the current frame is allowing power save.

[0232] Example 17: A method for saving energy, comprising:

obtaining the current frame for the current TXOP, the current frame containing the TXOP power save indication set by the AP based on whether power saving is allowed at the current TXOP and whether the STA identifier is added again in the operation target ID of the next frame, and STA there is STA with the function of entering the state of napping; and when the TXOP power save indication of the current frame is a power saving permission, the STA determines whether to switch to the snooze state based on the evaluation results for the snooze condition, the STA device being a STA device with a snooze function.

[0233] Example 18. The method of example 17, wherein the STA being STA with the function of entering the doze state comprises: STA is STA with the function of entering the doze state and maintaining the state of the snooze until the current TXOP ends; and the STA device being an STA device with the function of entering the doze state comprises: the STA device is an STA device with the function of entering the state of a snooze and keeping the snooze state until the end of the current TXOP.

[0234] Example 19: The method of example 17, also comprising:

when the TXOP power save indication of the current frame is forbidding power save, the STA device maintains the awake state, uses the next frame as the current frame, and returns to the current frame acquisition stage for the current TXOP.

[0235] Example 20: The method of example 19, wherein determining by the STA device whether to transition to a nap state based on the evaluation result for a nap condition includes:

in each frame from the current frame to the last frame for the current TXOP, evaluating by the STA device whether the first doze condition is satisfied, and if so, passing through the STA device into the Doze state; if not, the STA device maintains a wakeup state, wherein the first snooze condition comprises that the operation frame identifier of the current frame does not include an indication for that STA device, or the operation object identifier includes an indication for that STA device and an indication of the spatial multiplexing stream number corresponding to the STA is 0, or the operation target identifier of the current frame includes an indication for that STA device and this STA receives more data frames whose data bit indicia is 0;

- either the first snooze condition comprises that: the partial AID indicated in the operation target identifier of the current frame is different from the partial AID of that STA device, or the partial AID indicated in the operation objective of the current frame is the same as the partial AID of that STA device and the current frame is not sending the STA to this, either the operation target identifier of the current frame contains an indication for that STA device and this STA receives more frames whose data bit indications are 0.

[0236] Example 21: The method of example 20, wherein when the TXOP power save indication of the current frame is forbidding power save, the next is used as the current frame, and before returning to the current frame acquisition step for the current TXOP, the method also includes:

the STA device judges whether the second nap condition is satisfied and the evaluation result is recorded, the second nap condition comprising: either the operation target identifier of the current frame includes an indication for that STA device and this STA receives more data frames whose data bit indicia is 0;

or the second snooze condition comprises: the partial AID indicated in the operation target identifier of the current frame is the same as the partial AID of that STA device, and the current frame is not sent to this STA, or the operation target frame identifier contains an indication for that device STA and this STA receives more data frames for which the data bits are 0.

[0237] Example 22: The method of example 21, wherein before the STA device judges whether the first nap condition is met, the method also includes:

assessing, by the STA device, whether the recorded result of the evaluation of the second nap condition is satisfied or not met, and if the result of the evaluation is satisfied, the STA device goes into the Doze state; if the result of the evaluation is not met, performing the step that the STA device judges whether the first nap condition is met.

[0238] Example 23: An access point device, including:

a setup module configured to, based on whether power saving is allowed in the current TXOP transmission capacity, and whether the STA is added again in the operation target of the next frame for each frame for the current TXOP, the corresponding TXOP power save setting for each frame , wherein STA is STA with the function of entering the state of a nap; and a send module configured to send to the STA device at least one frame for the current TXOP, so that when the TXOP power save indication of the current frame is allowing to save power, the STA device determines whether to go into the state

- snooze based on the result of the evaluation for the nap condition, the STA device being the STA device with the function of entering the doze state.

[0239] Example 24: A device according to example 23, wherein the STA being STA with the function of entering the doze state comprises: STA is STA with the function of entering the doze state and maintaining the state of the snooze until the current TXOP ends; the STA device being an STA device with the function of entering the doze state comprises: the STA device is an STA device with the function of entering the state of a snooze and maintaining the state of the snooze until the end of the current TXOP.

[0240] Example 25: The device of example 23, wherein the setup module is configured to, if energy saving is allowed in the current TXOP and no identifier of the STA is added again in the operation target of the next frame for the current frame for the current TXOP, set the TXOP power save indication of the current frame for allowing energy saving or forbidding energy saving; if power saving is allowed in the current TXOP, set the TXOP power save indication of the current power save backup frame; and if the identifier of the STA is added again in the operation target identifier of the next frame for the current frame for the current TXOP, setting the TXOP power save indication of the current power saving backup frame.

[0241] Example 26: The device of example 23, wherein the setup module is configured to, if energy saving is allowed in the current TXOP and no identifier of the STA is added again in the operation target of the next frame for the current frame for the current TXOP, set the TXOP power save indication of the frame in the previously set position after the current frame to allow saving energy or forbidding energy saving; if power save is not allowed in the current TXOP, set the TXOP power save indication of the current power saving backup frame; and if the identifier of the STA is added again in the operation target identifier of the next frame for the current frame for the current TXOP,

[0242] Example 27: A device according to example 25 or 26, wherein the set-up module is configured to, if the operation view target of the current frame and the operation target identifier of the frame in front of the current frame indicate the STA device for which it is required to transfer data in all frames after the current one a frame in the current TXOP, determining that no identifier of the STA is added again in the operation target identifier of the next frame for the current frame for the current TXOP;

or the setup module is configured until, if the operation target identifier of the current frame includes an STA device for which it is required to transfer data in all frames after the current frame in the current TXOP, specify that no identifier of the STA is added again in the operation target of the next frame for current frame for the current TXOP.

[0243] Example 28: An apparatus according to example 27, in which the set-up module is also configured to, based on a pre-set number of changes of the TXOP power save indication value in one TXOP, the TXOP power save indications for each frame respectively set;

or the setup module is also configured to, based on the previously set form of changing the TXOP power save indication value, respectively set the TXOP power save indication for each frame.

[0244] Example 29: A device according to example 28, in which the set-up module is configured to, based on a preset number of changes of the TXOP power save indication value in one TXOP of one, a TXOP power save indication setting for each frame, respectively;

or the setup module is configured to, based on the previously set form of changing the TXOP power save indication value in one TXOP such that the TXOP power save indication of the previous frame is forbidding power save, and the TXOP power save indication of the current frame is allowing power save, display setting, respectively TXOP power saving for each frame.

[0245] Example 30: An STA device device in which the STA device device is an STA device having the function of entering the Doze state and includes:

an acquisition module configured to obtain the current frame of the current TXOP transmission capabilities, the current frame including the TXOP power save indication set by the AP device based on whether power saving is allowed at the current TXOP, and whether the STA station ID is added again the target operation identifier of the next frame, and STA is the STA with the function of entering the doze state;

an audit module configured to, when the TXOP power save indication of the current frame is allowing power save, controlling the STA device to determine whether to switch to the snooze state based on the evaluation result for the snooze condition.

[0246] Example 31: A device according to example 30, wherein the STA being STA with the function of entering the doze state comprises: STA is STA with the function of entering the doze state and maintaining the state of the snooze until the current TXOP ends; and the STA device being an STA device with the function of entering the doze state comprises: the STA device is a STA device with the function of entering the state of a snooze and maintaining the state of the snooze until the end of the current TXOP.

[0247] Example 32: The device of example 30, wherein the control module is also configured to, when the TXOP power save indication of the current frame is forbidding power save, controlling the STA device to maintain the wake up state, and controlling the obtain module to obtain the current frame for the current frame TXOP by using the next frame as the current frame.

[0248] Example 33: Device according to example 30 or 32, wherein

- the control module 58 is configured to, when the TXOP power save indication of the current frame is allowing to save energy, judging whether the first snooze condition is satisfied in each frame from the current frame to the last frame for the current TXOP, and if so, controlling the STA device for the transition in nap status; if not, controlling the STA device to maintain the awake state, the first snooze condition comprising: the job operation target identifier of the current frame does not include an indication for that STA device, or the operation target identifier of the current frame includes an indication for that STA device and an indication of the stream number spatial multiplexing, corresponding to this STA is 0,

or the first snooze condition comprises: the partial AID indicated in the operation target identifier of the current frame is different from the partial AID of that STA device, or the partial AID included in the operation frame's operation target identifier is the same as the partial AID of that STA device and the current frame no STA is sent to this, either the operation target identifier of the current frame contains an indication for that STA device and this STA receives more data frames in which the data bit indicia is 0.

[0249] Example 34: A device according to example 33, wherein the control module is also configured to, when the TXOP power save indication of the current frame is forbidding energy saving, judging whether the second doze condition is met and recording the evaluation result;

the second snooze condition comprises that: the operation target identifier of the current frame includes an indication for that STA and an indication of the spatial multiplexing number corresponding to that STA is 0, or the operation target identifier of the current frame includes an indication for that STA device and the STA receives more data frames whose data bit indications are 0;

or the second snooze condition comprises that the partial AID indicated in the operation target identifier of the current frame is the same as the partial AID of that STA device and the current frame is not sent to that STA, or the operation target identifier of the current frame includes an indication for that STA device and this STA receives more data frames in which the data bits are 0.

[0250] Example 35: An apparatus according to example 34, wherein the control module is also configured to, when the TXOP power save indication of the current frame is allowing to save energy, judging whether the recorded result of the second nap condition is satisfied or not met, and if the evaluation result is satisfied, controlling the STA device for the snooze state; if the result of the assessment is not met, an assessment of whether the first nap condition is met.

[0251] Example 36: A method for saving energy, comprising:

respectively, obtaining by the device of the STA station the current frame and the pre-set frame of the current TXOP transmission capabilities, the current frame

- 59 shows the indication of the next STA terminal and the TXOP power save indication, and the pre-set frame contains the operation target identifier; when the TXOP power save indication of the current frame is allowed, the operation target identifier of the previously set frame does not include an indication for that STA device, and the next STA indication of the current frame is such that no STA is added again later, which causes the STA device to go through the state of napping, wherein STA is STA with the function of entering the state of a nap; and the STA device is an STA device with the function of entering the doze state.

[0252] Example 37: The method of example 36, wherein the STA being STA with the function of entering the doze state comprises: STA is STA with the function of entering the doze state and maintaining the state of the snooze until the current TXOP ends; and the STA device being an STA device with the function of entering the doze state comprises: the STA device is a STA device with the function of entering the state of a snooze and maintaining the state of the snooze until the end of the current TXOP.

[0253] Example 38: The method of example 36 also comprising:

when the TXOP power save indication of the current frame is allowed, the operation target identifier of the previously set frame does not include an indication for that STA device and the next STA indication of the current frame is such that the STA station identifier is added again later, which causes the STA device to wake up .

[0254] Example 39. The method according to example 36 or 38, wherein the further STA indication comprises 1 bit, and when the next STA indication is that no identifier of the STA station is added again later, the bit is the first value, and when the next indication STA is that the STA station identifier is added again later, the bit is the second value; and the TXOP power save indication includes 1 bit, and when the TXOP power save indication is enable, the bit is the first value, and when the TXOP power save indication is forbidden, the bit is the second value;

or the next STA indication comprises 1 bit, and when the next STA indication is that no identifier of the STA station is added again later, the bit is the first value, and when the next indication of STA is that the STA station identifier is added again later, the bit is is the second value, and obtaining a TXOP power save indication includes: obtaining an indication of a TXOP power save permission;

or the next STA indication contains a total of 1 bit, and when the next indication of STA is that no identifier of the STA is added again later, and that the TXOP power save indication is enable, the bit is the first value, and when the next STA indication is this, that the STA station identifier is added again later or when the TXOP power save indication is forbidden, the bit is the second value.

[0255] Example 40: A method according to example 39, wherein the predefined frame comprises:

- 60 current frame for the current TXOP;

or one or more frames from the first frame to the current frame for the current TXOP. [0256] Example 41: The method of example 40, wherein the method also includes: setting, by the STA device, the identifier contained; after obtaining the operation target identifier of the current frame, the method also includes: evaluating, by the STA device, whether the current identifier is included yes or no, and if the current identifier is included yes, keeping the current identifier as yes; if the current included identifier is no, judging whether the operation target identifier of the current frame contains the identifier of that STA device, and if so, setting the included identifier to yes; otherwise, keeping the identifier included as not;

the method also includes: judging whether the identifier is yes or no, and if the identifier is yes, determining by the STA device that the operation target identifier of the pre-set frame contains indications for that STA device, and if the identifier is not, the device determines STA that the operation target identifier of the previously set frame does not contain an indication for this STA device.

[0257] Example 42: The method of example 41, the method further comprising: obtaining by the STA device information on the current TXOP period;

after entering the doze state, the method also includes: when the period of the current TXOP ends, moving through the STA device to the awake state.

[0258] Example 43: A STA device device in which the STA device is an STA device with the function of entering the Doze state and includes:

an acquisition module configured to respectively obtain the current frame and a preset current frame of the TXOP transmission capacity, in which the current frame includes the indication of the next STA and the TXOP power save indication, and the pre-set frame includes the operation target identifier;

the control module configured to, when the TXOP power save indication of the current frame is allowed, the operation target identifier of the previously set frame does not include an indication for that STA device and the next STA indication of the current frame is such that no STA identifier is added again later, controlling the STA device to enter a Doze state in which the STA is STA with the function of entering the Doze state.

[0259] Example 44: The device of example 43, wherein the STA being STA with the function of entering the Doze state comprises: STA is STA with the function of entering the Doze state and maintaining the Doze state until the current TXOP ends; and the STA device being an STA device with the function of entering the doze state comprises: the STA device is a STA device with the function of entering the state of a snooze and maintaining the state of the snooze until the end of the current TXOP.

[0260] Example 45: Device according to example 43, in which

The control module is also configured to, when the TXOP power save indication of the current frame is allowed, the operation target identifier of the previously set frame does not include an indication for that STA device and the subsequent STA indication of the current frame is such that the STA station identifier is added again later, controlling the STA device to maintain the state of arousal.

[0261] Example 46: An apparatus according to example 43 or 45, wherein the obtainment module is configured to obtain 1 information bit denoting successive STA indication, wherein if the next STA indication is that no identifier of the STA station is added again later, bit is the first value, and when the next indication of STA is that the identifier of the STA is added again later, the bit is the second value; and the obtaining module is configured to obtain 1 information bit indicating a TXOP power save indication, wherein when the power save indication is enable, the bit is the first value, and when the power save indication is forbidden, the bit is the second value;

or the obtaining module is configured to obtain 1 information bit denoting the subsequent STA indication, wherein when the next STA indication is that no identifier of the STA station is added again later, the bit is the first value, and when the next indication of STA is that the identifier the STA station is added again later, the bit is the second value; and obtaining an indication of TXOP power saving being not;

or the acquisition module is configured to obtain 1 information bit denoting successive STA indication and TXOP power save indication, wherein when the next STA indication is that no identifier of the STA station is added again later and the power save indication is enable, the bit is the first value and when the next STA indication is that the STA station identifier is added again later or the TXOP power save indication is forbidden, the bit is the second value.

[0262] Example 47: A device according to example 46, in which the obtainment module is configured to obtain the operation target identifier of the current frame for the current TXOP;

or the obtaining module is configured to obtain the operation target identifier of the at least one frame from the first frame to the current frame for the current TXOP.

[0263] Example 48: An apparatus according to example 47, also comprising: an identifier module configured to store and update the included identifier of the STA device, the identifier module being configured to judge whether the current included identifier is yes or no; and if the current included identifier is yes, keep the included identifier as yes; if the current identifier is not included, judging whether the operation target identifier of the current frame contains the identifier of that STA device, and if so, setting the included identifier to yes; otherwise, keeping the included identifier as not;

- the control module is configured to judge whether the included identifier is yes or no, and if the included identifier is yes, determining that the operation target identifier of the current frame contains an indication for that STA device, and if the identifier is not included, specifying that the identifier the operation of the current frame does not contain an indication for this STA device.

[0264] Example 49: An apparatus according to example 48, wherein the obtainment module is also configured to obtain information about the duration of the current TXOP; and the control module is also configured to, when the duration of the current TXOP ends, controlling the STA device for the transition to the awake state.