Method and apparatus for retrieving transmit opportunity control in reverse direction grant
Abstract
A transmission opportunity control recovery method, TXOP, in a reverse address grant, RDG, comprising: obtaining, through a reverse address responder, RD responder, a TXOP control granted by a reverse address initiator, RD Initiator ; when the RD responder enables a multiple input mode, multi-user multi-output, MU-MIMO, and the RD responder sends, at the same time, a frame to a plurality of stations in the TXOP period, including said plurality of stations the RD Initiator , requiring only that the RD Initiator send a block acknowledgment to enable the RD Initiator to recover the TXOP control.

Term
5.5 yearsto projected expiry
Projected expiry 21 March 2032, counted from filing; an application has no term until it is granted.
- Priority
- Filed
- Published
- Today
- Projected expiry
3 claims: 2 independent, 1 dependent
- 1ES 2 586 774 T3 REIVINDICACIONES 1. Un método de recuperación de control de oportunidad de transmisión, TXOP, en una concesión de dirección inversa, RDG, que comprende:obtener, mediante un respondedor de dirección inversa, Respondedor RD, un control TXOP concedido por un iniciador de dirección inversa, Iniciador RD;cuando el Respondedor RD habilita un modo de entradas múltiples, salidas múltiples de multiusuario, MU-MIMO, y el Respondedor Rd envía, al mismo tiempo, una trama a una pluralidad de estaciones en el periodo TXOP, incluyendo dicha pluralidad de estaciones el Iniciador RD, requiriendo solamente que el Iniciador RD envíe un acuse de recibo de bloque para habilitar al Iniciador RD para recuperar el control TXOP.
- 2El método para recuperación del control TXOP en una RDG según la reivindicación 1, que comprende, además:cuando el Iniciador RD no es capaz de demodular correctamente la trama, la recuperación, por el Iniciador RD, del control TXOP después de un espacio entre tramas de función de coordinación de puntos, PIFS.
- 3Un respondedor de dirección inversa, Respondedor RD, en donde el Respondedor RD está configurado para:obtener un control de oportunidad de transmisión, TXOP, concedido por un iniciador de dirección inversa, Iniciador RD;cuando el Respondedor RD habilita un modo de entradas múltiples, salidas múltiples de multiusuario, MU-MIMO, y cuando el Respondedor RD envía, al mismo tiempo, una trama a una pluralidad de estaciones dentro del periodo TXOP, comprendiendo dicha pluralidad de estaciones el Iniciador RD, exigir que solamente el Iniciador RD envíe un acuse de recibo de bloque para habilitar al Iniciador RD para recuperar el control TXOP.
Independent claims3
123 paragraphs in 14 sections, as filed
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DESCRIPTION
Method and device for recovering the right to control the transmission opportunity in a reverse concession
FIELD OF THE INVENTION
The present invention relates to the field of communication technologies and in particular, to a method and an apparatus for recovering the control of transmission opportunity in a reverse direction grant
BACKGROUND OF THE INVENTION
A Basic Service Set (BSS) is a basic element of a Wireless Local Area Networks (WLAN). A BSS network is made up of stations (STA, Station) that have some association within a specific coverage area. One association operational scenario is for stations to communicate directly with each other in an ad hoc network, which is called an Independent Basic Service Set (IBSS). Another common operating scenario is that in a BBS network, only one central station to specially manage a BSS set is called an access point (AP, Access Point), while other stations that are not in an AP access point are they are called terminals, or they are called non-AP stations STAs. The AP and non-AP STAs are collectively called STAs. The AP and non-AP STA stations need not be distinguished in the STA station description. In the same BSS network, due to factors such as distance and transmission power, a station STA is unable to detect another station STA that is far away from it. The two STAs are nodes hidden from each other.
In the 802.11e protocol, a Transmit Opportunity (TXOP) is introduced. A TXOP is a linked time interval during which a station can transmit a frame in a specific communication category. The station obtains a TXOP opportunity through contention. Once the TXOP opportunity is obtained, the station can transmit a frame in a specific communication category within TXOP. The frame can be specifically a data frame, a control frame or a management frame.
When a certain STA station obtains a TXOP opportunity through contention, the STA station is called a TXOP holder. A technology that within the TXOP opportunity, when the TXOP holder does not transmit data by himself, the TXOP holder temporarily transfers control of TXOP to another STA station, and the other STA station is enabled to send data to the TXOP holder in what is called a Reverse Direction Grant (RDG). In the RDG, the TXOP holder is called a Reverse Direction Initiator (RD Initiator) and the STA station that temporarily gains control of TXOP granted by the RD Initiator is called a reverse direction responder (RD Responder, Reverse Direction Reply).
To specifically utilize a spectral resource and improve a transmission rate, a multi-input, multi-user multi-output TXOP sharing mode (MU-MIMO) is defined for downlink data from an access point AP. In this mode of TXOP sharing of MU-MIMO technology, multiple types of services can share a TXOP, in order to perform simultaneous transmission of frames of multiple types of services in a MU-MIMO mode, thereby greatly saves spectral resources.
In a traditional RDG, when an RD Responder sends a last frame to an Initiator RD, or requires an Initiator RD to send a block acknowledgment for the frame, the Responder RD automatically forwards control of TXOP back to the Initiator RD.
If the Initiator RD correctly demodulates the last frame sent by the Responder RD, the Initiator RD immediately regains control of TXOP. When the Responder RD sends a Block Ack Request (BAR), the Initiator RD forwards a Block Acknowledgment (BA, Block Ack) to the Responder RD. When Initiator Rd cannot properly demodulate a block acknowledgment frame, Initiator RD regains control of TXOP using a Point Coordination Function Inter-Frame Space (PIFS). The recovery of TXOP control using the PIFS space means that when the RD Initiator is not able to properly demodulate a frame, and has no knowledge of whether the frame is a last frame and whether the block acknowledgment is needed the frame , within a PIFS space, the RD Initiator intercepts a state of a channel (busy or idle). If the channel is in an idle state within the PIFS space, the RD Initiator regains control of TXOP.
On the basis of traditional RDG, when the RD Responder is an access point AP that supports MUMIMO system, the access point AP can use MU-MIMo technology to improve the transmission rate. By way of example, in a specific operational scenario, the existing stations are an access point AP, a station STA1, and a station STA2. Station STA1 and station STA2 are nodes hidden from each other, Initiator RD is station STA1, and Responder RD is access point AP. When the AP enables MU-MIMO technology, it simultaneously sends a frame to station STA1 and station STA2 and requires station STA2 to send an acknowledgment in due time, if station STA1 is not able to correctly demodulate the frame, station STA1
ES 2 586 774 T3 regains control of TXOP using a PIFS space and then continues to send another frame to the access point AP. However, in this case, the station STA2 sends an acknowledgment BA to the access point AP in accordance with a request from the AP. That is, at the same point in time, station STA1 sends another frame to the AP and station STA2 sends a BA to the AP, resulting in an operational conflict.
The document entitled "ACK protocol and return procedure for MU-MIMO", by Simone Merlin, introduces a frame exchange after MU PPDU, in accordance with the fact that AP receives 3 BAs (Block Ack) from stations STA1 , STA2 and STA3 during the same TXOP opportunity, respectively.
SUMMARY OF THE INVENTION
Embodiments of the present invention disclose a method and apparatus for regaining control of transmission timing, TXOP, in a reverse direction grant, so that an operational conflict occurs between a case where an Initiator RD continues to send another frame to a Responder RD after recovery of control from TXOP and a case where a terminal other than Initiator rD can be prevented from sending an acknowledgment of block receipt to Responder RD, as disclosed in the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
To illustrate the technical solutions in the embodiments of the present invention more clearly, the accompanying drawings required to describe the embodiments are concisely described below. Obviously, the accompanying drawings in the following description merely illustrate some embodiments of the present invention and those of ordinary skill in this art can derive still other drawings from these accompanying drawings.
Figure 1 is a flow chart of a method for regaining control of a transmission opportunity in a reverse direction grant in accordance with an embodiment of the present invention;
Figure 2 is a schematic diagram of frame interaction between an Initiator RD and a Responder RD in accordance with an embodiment of the present invention;
Figure 3 is a flow chart of a method for regaining control of a transmission opportunity in a reverse direction grant in accordance with another embodiment of the present invention;
Figure 4 is a schematic diagram of a reverse direction initiator in accordance with one embodiment of the present invention; Y
Figure 5 is a schematic diagram of a reverse direction initiator in accordance with another embodiment of the present invention.
DETAILED DESCRIPTION OF THE FORMS OF REALIZATION
The embodiments of the present invention provide a method and apparatus for regaining control of a transmission opportunity in a reverse direction grant, so that a conflict occurs between a case where an Initiator RD continues to send. another frame to a Responder RD after recovery of TXOP control and a case where a terminal other than the Initiator RD can be prevented from sending a block acknowledgment to the Responder RD.
In order to make the objectives, operating characteristics and advantages of the present invention more clear and understandable, the technical solutions in the embodiments of the present invention are described, clearly and completely, below, with reference to the accompanying drawings at embodiments of the present invention. Obviously, the embodiments to be described are only a part and not all of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments derived by skilled in this art will fall within the scope of protection of the present invention.
An embodiment of the present invention provides a method for recovery of TXOP control in RDG, wherein the method includes:
when an Initiator RD is unable to correctly demodulate a frame sent by a Responder RD, the recovery, by the Initiator RD, of control of TXOP using a PIFS space if it is impossible for the Responder RD to allow a MU-MIMO mode, and the recovery, by the Initiator RD, of the control of TXOP using a duration if it is possible for the Responder RD to allow MU-MIMO mode, where the duration is greater than the PIFS space.
In this embodiment of the present invention, when the Initiator RD is unable to correctly demodulate the frame sent by the Responder RD, the Initiator RD regains control of the TXOP opportunity using a
ES 2 586 774 T3 duration if it is possible for the RD Responder to allow MU-MIMO mode, where the duration is greater than that of the PIFS space. Since the Initiator RD regains control of TXOP using a duration that is greater than that of the PIFS space, that is, within the duration that is longer than that of PIFS, a terminal other than the Initiator RD sends an acknowledgment of receipt of block to the RD responder, and then the RD responder continues to send a frame. In this case, the Initiator RD can intercept that a channel is in a busy state and does not regain control of TXOP, thereby avoiding an operational conflict between a case where the Initiator RD continues to send another frame to the Responder RD after the recovery of TXOP control and a case where the terminal other than the Initiator RD sends a block acknowledgment to the Responder RD. If it is impossible for the RD responder to enable the MUMIMO mode, it is impossible for the RD responder to simultaneously send a frame to the RD Initiator and to the terminal other than the RD Initiator. Therefore, a conflict between a case where the Initiator RD continues to send another frame to the Responder RD after the recovery of control from TXOP and a case where the terminal other than the Initiator RD sends a block acknowledgment to the Responder RD does not take place.
For details of the method for recovering control of TXOP in RDG disclosed in this embodiment of the present invention, reference is made to Figure 1. The method for recovering control of TXOP in RDG disclosed in this embodiment of the present invention includes:
101. When an Initiator RD is unable to correctly demodulate a frame sent by a Responder RD, the Initiator RD determines whether or not it is possible for the Responder RD to enable a MU-MIMO mode. If it is impossible for the RD Responder to enable MU-MIMO mode, 102 is operationally started for execution and if it is possible for the RD Responder to enable MU-MIMO mode, it is operationally started 103 for execution.
In this embodiment of the present invention, in an operational scenario where the Initiator RD is not able to correctly demodulate the frame sent by the Responder RD, the Initiator RD determines whether or not it is possible for the Responder RD to enable the MU-MIMO mode. It should be noted that there are multiple implementation ways for the RD Initiator in order to determine whether or not it is possible for the RD Responder to enable MU-MIMO mode. The multiple modes of implementation are described in detail below.
A1. The RD Initiator will determine if the RD Initiator supports MU-MIMO mode. If the RD Initiator does not support MUMIMO mode, it is impossible for the RD Responder to enable MU-MIMO mode.
A frame is transmitted between the Responder RD and the Initiator RD. If the RD Initiator does not support MU-MIMO mode, it is impossible for the RD Responder to enable MU-MIMO mode.
A2. The RD Initiator determines whether or not the RD Initiator belongs to any group that is used to enable MU-MIMO mode. If the RD Initiator does not belong to any group that is used to enable MU-MIMO mode, it is impossible for the RD Responder to enable MU-MIMO mode.
A frame is transmitted between the Initiator RD and the Responder RD. If the RD Initiator does not belong to any group (Group) that is used to enable MU-MIMO mode, it is impossible for the RD Responder to enable MUMIMO mode.
A3. The Initiator RD determines whether the Responder RD supports MU-MIMO mode. If the RD Responder does not support MU-MIMO mode, it is impossible for the RD Responder to enable MU-MIMO mode.
Before a frame is transmitted between the Initiator RD and the Responder RD, the Initiator RD is able to acquire the information whether the Responder RD supports MU-MIMO mode. If the RD Responder does not support MU-MIMO mode, it is impossible for the RD Responder to enable MU-MIMO mode.
It should be noted that, application parameter the three previous ways of implementation, A1, A2 and A3 if at least one of the three results of the determination is "no", the RD Initiator may determine that it is impossible for the RD Respondent to enable MU-MIMO mode and 102 are operatively started for execution. The above implementations A1, A2 and A3 are all optional determination methods and any of them can be selected in this regard. Alternatively, those skilled in the art can use other determination methods. The determination methods disclosed herein are for illustrative purposes only and not as a limitation.
Conversely, when Initiator RD belongs to at least one group that is used to enable MU-MIMO mode, Initiator RD may consider it possible for Responder Rd to enable MU-MIMO mode and 103 is operationally started for its execution. Of course, other ways of implementation can also be used to determine that it is possible for the RD Responder to enable MU-MIMO mode. The ways of implementation described herein are for illustrative purposes only and not as a limitation.
102. If it is impossible for the RD Responder to enable MU-MIMO mode, the RD Initiator regains control of the TXOP using a PIFS space.
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In this embodiment of the present invention, if it is impossible for the Responder RD to enable the MUMIMO mode, the Responder RD is able to send a frame to only the Initiator RD, but is unable to send a frame to a station STA other than the one. Initiator RD, and may also not require the STA station other than Initiator RD to send a block acknowledgment. In this case, the Initiator RD regains control of TXOP using the PIFS space and then continues to send another frame to the Responder RD. Therefore, an operational conflict does not occur between a case where the Initiator RD continues to send another frame to the Responder RD after recovery of control from TXOP and a case where the terminal other than the Initiator RD sends a block acknowledgment. Respondent RD.
In this embodiment of the present invention, the recovery of TXOP control using the PIFS space means that when the Initiator RD is unable to correctly demodulate a frame, and has no knowledge of whether the frame is a last frame and whether it is needs a block acknowledgment for the frame, within a PIFS space, the Initiator RD intercepts a state of a channel (busy or idle). If the channel is in an idle state within the PIFS space, the RD Initiator regains control of TXOP. A PIFS space is a short interframe space plus a time interval.
In a BSS network, only one central station for the particularized management of BSS is called an access point (AP, Access Point), while other stations other than an AP access point are called terminals, or are called STAs. not from AP. AP stations and non-AP stations STAs are collectively referred to as STAs. Access point AP and non-AP stations STAs need not be distinguished in the description of the STA station.
For an independent BSS network, a data transmission object directly one station STA is another station STA. For a BSS network that has an AP access point, a direct data transmission object of a non-AP station STA is another non-AP station STA or AP. However, in a BSS network, a direct data transmission object of an access point AP may be a plurality of non-AP stations STAs. Therefore, when an access point AP obtains control of TXOP, within a control period of control of TXOP, a data transmission object directly from the access point AP can be a plurality of non-operating stations STAs. AP. When the access point AP serves as a Responder Rd but it is impossible for the Responder RD to enable MU-MIMO mode, the Initiator RD regains control of TXOP using a PIFS space and therefore no conflict occurs between a case in where the Initiator RD continues to send another frame to Responder rD after recovery of control from TXOP and a case where the terminal other than Initiator RD sends a block coupling to Responder RD.
103. If it is possible for the RD Responder to enable MU-MIMO mode, the RD Initiator regains control of TXOP using a duration that is greater than the PIFS space.
In this embodiment of the present invention, it may be known through the determination at 101 that when it is possible for the RD Responder to enable MU-MIMO mode, the RD Initiator regains control of TXOP using a duration that is longer than the PIFS space.
In this embodiment of the present invention, the recovery of TXOP control using a duration that is longer than the PIFS space, means that when the Initiator RD is not able to correctly demodulate a frame and has no knowledge of whether the frame it is a last frame and if a block acknowledgment is needed for the frame, within a duration that is longer than the PIFS space, the RD Initiator intercepts a state of a channel (busy or idle). If the channel is in an idle state within the duration that is greater than the PIFS space, the RD Initiator regains control of TXOP.
It should be noted that in this embodiment of the present invention, in practical application, the duration that is longer than the PIFS space can be implemented in multiple embodiments. The multiple ways of implementation are described in detail below.
One way of putting it into practice is that the duration that is longer than the PIFS space can be expressed as the following expression (1):
Duration that is longer than the space PIFS = 2 * SIFS + aSlotTime + Max (BA Time), where the SIFS is a short interframe space, the aSlotTime is an interval, and the Max (BA Time) is a maximum duration for send a block acknowledgment frame. The maximum duration for sending a block acknowledgment frame is a duration required for modulation of the block acknowledgment frame at a minimum bit rate and the separate sending of the block acknowledgment frame using a minimum unit frequency band.
It can be obtained from the expression (1) that within the duration that is longer than the PIFS space, and is described in the expression (1), if a terminal other than the Initiator RD sends a block acknowledgment to the Responder RD, the Initiator RD is capable of interception on a channel that is in a busy state and does not regain control of TXOP, thereby avoiding a conflict between a case where the Initiator RD continues to send another frame to the
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Responder RD after recovery of control from TXOP and a case where the terminal other than Initiator RD sends a block acknowledgment to Responder RD.
Another way of implementation is that a block acknowledgment frame sent by a station STA other than the Initiator RD is a compressed block acknowledgment frame (Compressed BA), the duration that is longer than the PIFS space can be expressed as the following expression (2):
Duration that is longer than the space PIFS = 2 * SIFS + aSlotTime + Max (Compressed BA Time), where the SIFS is a shorter space between frames, the aSlotTime is an interval and the Max (Compressed BA Time) is a maximum duration to send a compressed block acknowledgment frame. The maximum duration for sending a compressed block acknowledgment frame is a duration for modulating the block acknowledging frame at a minimum bit rate and separately sending the block acknowledging frame using a minimum unit frequency band.
It can be obtained from expression (2) that within the duration that is longer than the PIFS space and described in expression (2), if a terminal other than the Initiator RD sends a block acknowledgment to the Responder RD , the Initiator RD is capable of interception on a channel in which the channel is in a busy state, and does not regain control of TXOP, thereby avoiding an operational conflict between a case where the Initiator RD continues to send another frame to the Responder RD after the recovery of TXOP control and a case where the terminal other than the Initiator RD sends a block acknowledgment to the Respondent RD.
In this embodiment of the present invention, when the Initiator RD is not able to correctly demodulate the frame sent by the Responder RD, the Initiator RD regains control of TXOp using a duration if it is possible for the Responder RD to enable MU mode. -MIMO, where the duration is longer than the PIFS space. Since the Initiator RD regains control of TXOP using a duration that is longer than the PIFS space, that is, within the duration that is longer than the PIFS, a terminal other than the Initiator rD sends an acknowledgment of receipt of block to the RD responder and then the RD responder continues to send a frame. In this case, the RD Initiator can intercept that a channel is in a busy state and does not regain control of TXOP, thereby avoiding an operational conflict between a case where the RD Initiator continues to send another frame to the Responder RD after recovery of control from TXOP and a case where the terminal other than Initiator RD sends a block acknowledgment to Responder RD. If it is impossible for the Responder RD to enable MU-MIMO mode, it is impossible for the Responder RD to simultaneously send a frame to the Initiator RD and to the terminal other than the Initiator RD. Therefore, there is no conflict between a case where the Initiator RD continues to send another frame to the Responder RD after recovery of control from TXOP and a case where the terminal other than the Initiator RD sends a block acknowledgment. Respondent RD.
A method for regaining control of transmission opportunity in a reverse direction grant disclosed in an embodiment of the present invention is described below using a detailed application scenario. As illustrated in Figure 2, in a BSS network, an access point AP, a station STA1, a station STA2 and a station STA3 exist in this regard. Station STA1 first gains control of TXOP by contention, and station STA1 becomes a TXOP holder. Station STA1 sends frame 1 and frame 2 to access point AP. When the TXOP holder does not transmit data himself, the TXOP holder temporarily transfers control of TXOP to the AP access point to allow the AP to send data to the TXOP holder. That is, station STA1 is an Initiator RD and access point AP is a Responder RD.
As illustrated in Figure 2, within a TXOP opportunity, after sending frame 1 to the access point AP, the station STA1 requires the access point AP to send an acknowledgment. Access point AP sends block acknowledgment BA1 to station STA1 and then station STA1 sends frame 2 to AP and temporarily transfers control of TXOP to access point Ap. Within a RDG MU-MIMO transmission duration, the access point AP sends a frame 5 to station STA1. Since the access point AP enables a MUMIMO mode, the AP simultaneously sends frame 5 to station STA2 and frame 3 to station STA3 and requires station STA2 to send an acknowledgment. Therefore, the station STA2 sends a BA2 to the access point AP. In this case, demodulation of station STA1 in frame 5 is not possible, that is, station STA1 is not capable of correctly demodulating frame 5. In accordance with the method disclosed in this embodiment of the present invention, when the station STA1 serving as the Initiator RD is not able to correctly demodulate a frame sent by the Responder RD, the Initiator RD determines whether it is possible to The Responder RD (that is, the Access Point AP) enable MU-MIMO mode. If it is possible for the RD Responder to enable MU-MIMO mode, the RD Initiator regains control of TXOP using a duration that is longer than a PIFS space. In an embodiment illustrated in Figure 2, when the RD Initiator intercepts a busy / idle state of a channel within the duration that is longer than the PIFS space, and finds that the channel is in the busy state ( channel is in busy state because station STA2 sends BA2 to point AP). Therefore, station STA1 does not regain control of TXOP.
After receiving the BA2 sent by the station STA2, the access point AP sends a BAR1 to the station STA3, to request the station STA3 to send an acknowledgment. Therefore, station STA3 sends a BA3 to station
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STA1 in compliance with a requirement of the access point AP. Next, the access point AP continues to send a frame 8 to the station STA1 and simultaneously sends a frame 7 to the station STA2 and a frame 6 to the station STA3. After sending all three frames, the access point AP completes sending frames. In this case, the AP sends a bAR2 to station STA1 to request station STA1 to send an acknowledgment. However, when station STA1 is unable to properly demodulate BAR2, in accordance with the method disclosed in this embodiment of the present invention, Initiator RD regains control of TXOP using PIFS space if it is impossible to the RD Responder will enable MU-MIMO mode. That is, if station STA1 intercepts within the PIFS space that the channel is always in the idle state, station STA1 can regain control of TXOP. In accordance with the method disclosed in this embodiment of the present invention, if it is possible for the RD Responder to enable MU-MIMO mode, the RD Initiator regains control of TXOP using a duration that is longer than a space. PIFS. That is, if station STA1 performs an intercept within a duration that is longer than a PIFS slot in the sense that the channel is always in the idle state, station STA1 can regain control of TXOP and then continue to send a frame 9 to the AP.
Another method for recovery of TXOP control in RDG disclosed in an embodiment of the present invention is described below and includes.
when an Initiator RD is unable to properly demodulate a very high performance A1 signaling in a frame sent by a Responder RD, recovery, by the Initiator RD, of control of TXOP using a PIFS space if it is impossible for the Responder RD to enable the MU-MIMO mode, and the recovery, by the Initiator rD, of the TXOp control using a duration if it is possible for the Responder rD to enable the MU-MIMO mode, where the duration is longer than the PIFS space;
when the Initiator RD correctly demodulates the very high performance A1 signaling in the frame sent by the Responder RD but is not able to properly demodulate the entire frame, the Initiator RD recovery of TXOP control using the PIFS space if the frame is a single user frame and a Partial AID value in the very high performance A1 signaling is the same as the RD Initiator Partial AID value;
when the Initiator RD correctly demodulates the very high performance A1 signaling in the frame sent by the Responder RD, but is not able to properly demodulate the entire frame, the Initiator RD recovery of the TXOP control using a duration if the frame is a multi-user frame, where the duration is longer than the PIFS space; and when the Initiator RD correctly demodulates the very high performance A1 signaling in the frame sent by the Responder RD, but is not able to correctly demodulate the entire frame, the Initiator RD recovers the TXOP control using a duration if the frame is a single user frame and the value of the Partial AID in the very high performance A1 signaling is different from the value of the Partial AID of the Initiator RD, where the duration is longer than the PIFS space.
In another embodiment of the present invention, when an Initiator RD is unable to properly demodulate a very high throughput A1 signaling in a frame sent by a Responder RD, the Initiator RD regains control of TXOP using a duration if possible. for the RD Responder enable MU-MIMO mode, where the duration is longer than a PIFS space. Since the Initiator RD regains control of TXOP using a duration that is longer than a PIFS space, that is, within the duration that is longer than a PIFS space, a terminal other than the Initiator RD sends an acknowledgment of block to Responder RD, and then Responder RD continues to send a frame. In this case, the Initiator RD can intercept that a channel is in a busy state and does not regain control of TXOP, thereby avoiding an operational conflict between a case where the Initiator rD continues to send another frame to the Responder RD afterwards. of the recovery of TXOP control and a case where the terminal other than the Initiator rD sends a block acknowledgment to the Responder RD. When the Initiator RD successfully demodulates the very high performance A1 signaling, in the frame sent by the Responder RD, but is not able to properly demodulate the entire frame, the Initiator RD regains control of TXOP using the PIFS space if the frame it is a single user frame and a value of a Partial AID in the frame is the same as a value of a Partial AID of the Initiator RD. Since the frame sent by the Responder RD to the Initiator RD is a single user frame, that is, the frame is sent only by the Responder RD to the Initiator RD, it is impossible for the Responder RD to simultaneously send a frame to the Initiator RD and to the terminal other than RD Initiator. Therefore, an operational conflict does not occur between a case where the Initiator RD continues to send another frame to the Responder RD after recovery of control from TXOP and a case where the terminal other than the Initiator RD sends a block acknowledgment. Respondent RD. When the RD Initiator satisfies one of the following conditions, the RD Initiator regains control of TXOP using a duration that is longer than a PIFS space. The preset conditions are: the frame is a multi-user frame and the value of Partial AID in very high performance A1 signaling is different from the value of Partial AID of RD Initiator. Since the Initiator RD regains control of TXOP using a duration that is longer than a PIFS space, that is, within the duration that is longer than a PIFS space, a terminal other than the Initiator RD sends an acknowledgment of receipt of block to the RD responder and then the RD responder continues to send a frame. In this case, the Initiator RD can intercept that a channel is in a busy state and does not regain control of TXOP, thereby avoiding an operational conflict between a case where the Initiator RD continues to send another frame to the Responder RD afterwards. of the
ES 2 586 774 T3 recovery of TXOP control and a case where the terminal other than the Initiator RD sends a block acknowledgment to the Responder RD.
For details of the method for recovery of TXOP control in an RDG disclosed in this embodiment of the present invention, reference is made to Figure 3, where the method includes:
301. An Initiator RD demodulates a very high performance A1 signaling in a frame sent by a Responder RD. If the Initiator RD is unable to properly demodulate the very high performance A1 signaling, it is operationally started 302 for execution; and if the Initiator RD correctly demodulates the very high performance A1 signaling but is not able to correctly demodulate the entire frame, it is operationally started 304 for execution.
In this embodiment of the present invention, the RD Initiator demodulates the very high performance A1 signaling in the frame, where the very high performance A1 signaling (Very high Throughput Signal field-A1, VHSIG-A1) includes an identifier Group Identifier (Group ID) and a Partial Association Identifier (Partial AID).
302. When the Initiator RD is unable to properly demodulate the very high performance A1 signaling in the frame sent by the Responder RD, the Initiator RD determines whether it is possible for the Responder RD to enable MU-MIMO mode. If it is impossible for the RD Responder to enable MU-MIMO mode, 303 is operationally started for execution; and if it is possible for the RD Responder to enable the MU-MIMO mode, it is operatively started 306 for execution.
In this embodiment of the present invention, in an operational scenario where the Initiator RD is unable to correctly demodulate the very high throughput A1 signaling in the frame sent by the Responder RD, the Initiator RD determines whether it is possible for the Responder RD enable MU-MIMO mode. It should be noted that there are multiple implementation ways for the RD Initiator to determine whether or not it is possible for the RD Responder to enable MU-MIMO mode. The multiple ways of implementation are described in detail below.
B1. The RD Initiator determines whether the RD Initiator supports MU-MIMO mode. If the RD Initiator does not support MUMIMO mode, it is impossible for the RD Responder to enable MU-MIMO mode.
A frame is transmitted between the Initiator RD and the Responder RD. If the Initiator RD does not support MU-MIMO mode, it is impossible for the Responder RD to enable MU-MIMO mode.
B2. The RD Initiator determines whether the RD Initiator belongs to any group that is used to enable MUMIMO mode. If the RD Initiator does not belong to any group that is used to enable MU-MIMO mode, it is impossible for the RD Responder to enable MU-MIMO mode.
A frame is transmitted between the Initiator RD and the Responder RD. If the RD Initiator does not belong to any group (Group) that is used to enable MU-MIMO mode, it is impossible for the RD Responder to enable MUMIMO mode.
B3. The Initiator RD determines if the Responder RD supports MU-MIMO mode. If the RD Responder does not support MU-MIMO mode, it is impossible for the RD Responder to enable MU-MIMO mode.
Before a frame is transmitted between the Initiator RD and the Responder RD, the Initiator RD is able to acquire information as to whether the Responder RD supports MU-MIMO mode. If the RD Responder does not support MU-MIMO mode, it is impossible for the RD Responder to enable MU-MIMO mode.
It should be noted that, for the above three implementation ways B1, B2 and B3, if at least one of three determination results is "no", the RD Initiator may determine that it is impossible for the RD responder to enable MU mode. -MIMO and 302 is operatively started for its execution. The above implementation ways B1, B2 and B3 are all optional determination methods and any of them can be selected. Alternatively, those skilled in the art can use other determination methods. The determination methods, in this description, are for illustrative purposes only and not as a limitation.
Conversely, when the RD Initiator belongs to at least one group that is used to enable MU-MIMO mode, the RD Initiator may consider it possible for the RD Responder to enable MU-MIMO mode and is operationally started 303 for its execution. Of course, other ways of implementation can also be used to determine that it is possible for the RD Responder to enable MU-MIMO mode. The modes of implementation, in this description, are for illustrative purposes only and not as a limitation.
303. The RD Initiator regains control of TXOP using a PIFS space.
ES 2 586 774 T3
In this embodiment of the present invention, if it is impossible for the Responder RD to enable the MUMIMO mode, the Responder RD is able to send a frame only to the Initiator RD, but is unable to send a frame to a station STA other than the Initiator. RD and cannot require the STA station other than the RD Initiator to send a block acknowledgment. In this case, Initiator rD regains control of TXOP using PIFS space and then continues to send another frame to Responder RD. Therefore, there is no conflict between a case where the Initiator RD continues to send another frame to the Responder RD after recovery of control from TXOP and a case where the terminal other than the Initiator RD sends a block acknowledgment. Respondent RD.
304. Whether or not the Initiator RD correctly demodulates the very high performance A1 signaling and the Initiator RD determines, in accordance with the group identifier in the very high performance A1 signaling, whether or not the frame is a single user frame. If the frame is a single user frame, it is operatively started 305 for execution; and if the frame is not a single user frame, it is operatively started 306 for execution.
In a very high performance A1 signaling, (VHT-SIG-A1, Very High Throughput-Signal-A1) in a physical layer, a Group ID field is used to identify MU-MIMO and a field of Partial Association Identifier (Partial AID) is used to identify an ID identifier of a target STA station of the data. When a value of the Group ID field is a value that varies from 2 to 62, it indicates that the data packet is a multi-user data packet (Multiple-User) and when the value of the Group ID field is 0 or 63, it indicates that the data packet is a Single User (SU) data packet. If a value of the Partial AID field in the data packet matches that of a Partial AID of a station STA, this indicates that the data packet SU is a data packet of the STA station.
In this embodiment of the present invention, the Initiator RD determines, in accordance with the group identifier in the very high performance A1 signaling, whether or not the frame is a single user frame, which can be specifically: determining whether a value of a Group ID is 0 or 63. If the value of the Group ID is 0 or 63, the frame is a single user frame. If the value of the Group ID is neither 0 nor 63, the frame is not a single-user frame but a multi-user frame.
305. If the frame is a single user frame, the Initiator RD determines whether a value of a Partial AID in the frame is the same as a value of a Partial AID of the Initiator RD. If the value of Partial AID in the frame is the same as the value of Partial AID of Initiator RD, 302 is operationally started for execution. If the value of the Partial AID in the frame is different from the Partial AID value of the Initiator RD, it is operatively started 306 for execution.
306. The RD Initiator regains control of TXOP using a duration that is longer than a PIFS space.
It should be noted that 306 in the embodiment illustrated in Figure 3 is similar to 103 illustrated in Figure 1, therefore it is not detailed here again.
It should be noted that in this embodiment of the present invention, in practical application, the duration that is longer than a PIFS space can be implemented in multiple embodiments. The multiple embodiments are described in detail below.
One embodiment is that, within the duration that is longer than a PIFS space and is described in expression (1), if a terminal other than the Initiator RD sends a block acknowledgment to the Responder RD, the Initiator RD is able to intercept on a channel that the channel is in a busy state, and does not regain control of TXOP, thereby avoiding an operational conflict between a case where the Initiator Rd continues to send another frame to the Responder RD after the recovery of TXOP control and a case where the terminal other than the Initiator RD sends a block acknowledgment to the Respondent RD.
Another way of putting it into practice is that, within the duration that is longer than a PIFS space and is described in expression (2), if a terminal other than the Initiator RD sends a block acknowledgment to the Responder RD, the Initiator RD is able to intercept on a channel that the channel is in an idle state, and does not regain control of TXOP, thus avoiding an operational conflict between a case where the Initiator RD continues to send another frame to the Responder RD after the recovery of control of TXOP and a case where the terminal other than the Initiator RD sends a block acknowledgment to the Respondent RD.
In this embodiment of the present invention, when the Initiator RD is unable to properly demodulate the very high performance signaling in the frame sent by the Responder RD, the Initiator RD regains control of TXOP using a duration if possible to the RD Responder enable MU-MIMO mode, where the duration is longer than the PIFS space. Since the Initiator RD regains control of TXOP using a duration that is longer than a PIFS space, that is, within the duration that is longer than a PIFS space, a terminal other than the Initiator RD sends an acknowledgment of receipt of block to the RD responder and then the RD responder continues to send a frame. In this case, the Initiator RD can intercept that a channel is in a busy state, and does not regain control of TXOP, thereby preventing an operational conflict from occurring between a case where the Initiator Rd continues to send another frame to the Responder rD after recovery of control from TXOP and a case where the terminal other than Initiator rD sends a block acknowledgment to Responder RD. When the
ES 2 586 774 T3
Initiator RD correctly demodulates the very high performance A1 signaling in the frame sent by the Responder RD but is not able to properly demodulate the frame completely, the Initiator RD regains control of TXOP using the PIFS space if the frame is a frame of unique user and the Partial AID value in the frame is the same as the RD Initiator Partial AID value. Since the frame sent by the Responder RD to the Initiator RD is a single user frame, that is, the frame is sent only by the Responder RD to the Initiator RD, it is impossible for the Responder RD to simultaneously send a frame to the Initiator RD and the terminal other than RD Initiator. Therefore, there is no operational conflict between a case where the Initiator RD continues to send another frame to the Responder RD after the recovery of control of TXOP and a case where the terminal other than the Initiator RD sends an acknowledgment of receipt. block to responder RD. When the RD Initiator satisfies one of the following conditions, the RD Initiator regains control of TXOP using a duration that is longer than a PIFS space. The following conditions are: the frame is not a single user frame; and the value of Partial AID in very high performance A1 signaling is different from the value of Partial AID of Initiator RD. Since Initiator RD regains control of TXOP using a duration that is longer than a PIFS space, that is, within the duration that is longer than a PIFS space, a terminal other than Initiator RD sends an acknowledgment of block to the RD responder and then the RD responder continues to send a frame. In this case, the Initiator RD can intercept that a channel is in a busy state, and does not regain control of TXOP, thereby avoiding an operational conflict between a case where the Initiator RD continues to send another frame to the Responder RD. after recovery of TXOP control and a case where the terminal other than the Initiator RD sends a block acknowledgment to the Responder RD.
Another method for regaining control of a transmission opportunity in a reverse direction grant disclosed in an embodiment of the present invention is described below and includes:
when an RD responder enables a MU-MIMO mode, and the RD responder simultaneously sends a frame to a plurality of stations including an RD Initiator, requiring only that the RD Initiator send a block acknowledgment, so that the RD Initiator be able to regain control of TXOP.
In a practical application, the method may further include: when the Initiator RD is not able to correctly demodulate the frame sent by the Responder RD, the recovery, by the Initiator RD, of the control of TXOP using the PIFS space.
In this embodiment of the present invention, when the Responder RD enables MU-MIMO mode and simultaneously sends a frame to a plurality of stations including the Initiator RD, only the Initiator RD is required to send a block acknowledgment. , so that the Initiator RD is capable of regaining control of TXOP. The RD Responder only requires the RD Initiator to send a block acknowledgment. Since the Responder RD cannot request a station STA other than the Initiator RD to send a block acknowledgment. Therefore, there is no operational conflict between a case where the Initiator RD continues to send another frame to the Responder RD after the recovery of control of TXOP and a case where the terminal other than the Initiator RD sends an acknowledgment of receipt. block to responder RD.
In the above embodiments, the method for recovering transmission timing control in a reverse direction grant disclosed in embodiments of the present invention is described. A reverse direction type RD Initiator disclosed in an embodiment of the present invention is described below.
As illustrated in Figure 4, one embodiment of the present invention provides a reverse direction RD Initiator 400 that includes:
a first control recovery unit 401, configured for, when an Initiator RD is not able to correctly demodulate a frame sent by a Responder RD, the recovery of control from TXOP using a PIFS space if it is impossible for the Responder RD to enable the mode MU-MIMO;
a second control recovery unit 402, configured to, when the RD Initiator is not able to correctly demodulate the frame sent by the RD responder, regain control of the TXOP using a duration if it is possible for the RD responder to enable MU-mode. MIMO, where the duration is longer than the PIFS space.
For the first control recovery unit 401, in practical application, one practical way is that the first control recovery unit 401 is specifically configured to:
regain control of TXOP using the PIFS space when the Initiator RD is not able to correctly demodulate the frame sent by the Responder RD and the Initiator RD does not support MU-MIMO mode;
or
ES 2 586 774 T3 regain control of TXOP using PIFS space when RD Initiator is not able to properly demodulate the frame sent by RD Responder and RD Initiator does not belong to whatever group is used to enable MU-MIMO mode ;
or regain control of TXOP using the PIFS space when the Initiator RD is not able to correctly demodulate the frame sent by the Responder RD and the Responder RD does not support MU-MIMO mode.
For the second control recovery unit 402, in practical application, one practical way is that the second control recovery unit 402 is specifically configured to:
regain control of TXOP using a duration when the Initiator RD is unable to properly demodulate the frame sent by the Responder RD and the Initiator RD belongs to at least one group that is used to enable MU-MIMO mode, where the duration is longer than the PIFS space.
It should be noted that a content such as information exchange and an execution process between modules / units of the apparatus is based on the same concept as the embodiments of the method of the present invention. The technical effects are the same as those of the embodiments of the method of the present invention. For more details, reference may be made to the description of the embodiment of the method illustrated in Figure 1 in the present invention, which is not detailed here again.
In this embodiment of the present invention, if it is possible for the RD responder to enable the MUMIMO mode, the second control recovery unit 402 regains control of TXOP using a duration that is longer than a PIFS space. Since Initiator RD regains control of TXOP using a duration that is longer than a PIFS space, within the duration that is longer than a PIFS space, a terminal other than Initiator rD sends a block acknowledgment to Responder RD and then the responder RD continues to send a frame. In this case, the Initiator RD can intercept that a channel is in a busy state, and not regain control of TXOP, thereby avoiding an operational conflict between a case where the Initiator RD continues to send another frame to the Responder RD. after recovery of TXOP control and a case where the terminal other than the Initiator RD sends a block acknowledgment to the Responder RD. If it is impossible for the Responder RD to enable MU-MIMO mode, it is possible for the Responder RD to simultaneously send a frame to the Initiator RD and to the terminal other than the Initiator RD. Therefore, there is no conflict between a case where the Initiator RD continues to send another frame to the Responder RD after recovery of control from TXOP and a case where the terminal other than the Initiator RD sends a block acknowledgment. Respondent RD.
As illustrated in Figure 5, one embodiment of the present invention provides another reverse direction initiator 500, including:
a first control recovery unit 501, configured so that, when an Initiator RD is not able to properly demodulate a very high performance A1 signaling in a frame sent by a Responder RD, regain control of TXOP using a PIFS space if impossible for the RD responder enable the MUMIMO mode;
a second control recovery unit 502, configured to, when the Initiator RD is unable to properly demodulate a very high performance A1 signaling in a frame sent by the Responder RD, regain control of TXOP using a duration if possible to the RD Responder enable MU-MIMO mode, where the duration is longer than the PIFS space;
a third control recovery unit 503, configured for, when the Initiator RD correctly demodulates the very high performance A1 signaling in the frame sent by the Responder RD, but is not able to fully demodulate the frame, regain control of TXOP using the PIFS space if the frame is a single unit user frame and a value of a Partial AID in the very high performance A1 signaling is the same as a value of a Partial AID of the Initiator RD;
a fourth control recovery unit 504, configured to, when the Initiator RD correctly demodulates the very high performance A1 signaling in the frame sent by the Responder RD but is not able to correctly demodulate the frame completely, regain control of TXOP using a duration if the frame is a multi-user frame, where the duration is longer than the PIFS space; and a fifth control recovery unit 505, configured to, when the Initiator RD correctly demodulates the very high performance A1 signaling in the frame sent by the Responder RD but is not able to correctly demodulate the frame completely, regain control of TXOP using a duration if the frame is a single user frame and the value of the Partial AID in the very high performance A1 signaling is different from the value of the Partial AID of the RD Initiator, where the duration is longer than the PIFS space.
ES 2 586 774 T3
For the first control recovery unit 501, in practical application, one practical way is that the first control recovery unit 501 is specifically configured to:
regain control of TXOP using the PIFS space when the Initiator RD is not able to correctly demodulate the frame sent by the Responder RD and the Initiator RD does not support MU-MIMO mode;
or regain control of TXOP using the PIFS space when the Initiator RD is not able to correctly demodulate the frame sent by the Responder RD and the Initiator RD does not belong to whatever group is used to enable MU-MIMO mode;
or regain control of TXOP using the PIFS space when the Initiator RD is not able to correctly demodulate the frame sent by the Responder RD and the Responder RD does not support MU-MIMO mode.
For the second control recovery unit 502, in practical application, one practical way is that the second control recovery unit 502 is specifically configured to:
regain control of TXOP using a duration when the Initiator RD is unable to properly demodulate the frame sent by the Responder RD and the Initiator RD belongs to at least one group that is used to enable MU-MIMO mode, where the duration is longer than the PIFS space.
It should be noted that the contents such as information exchange and an execution process between modules / units of the apparatus are based on the same concept as the embodiments of the method of the present invention. The technical effects are the same as those of the embodiment of the method of the present invention. For further details, reference may be made to the description of the embodiments of the method illustrated in Figure 3 in the present invention, which is not detailed here again.
In this embodiment of the present invention, when the Initiator RD is unable to properly demodulate the very high performance A1 signaling in the frame sent by the Responder RD, the Initiator RD regains control of TXOP using a duration if possible. for RD Responder enable MU-MIMO mode, where duration is longer than PIFS space. Since the Initiator RD regains control of TXOP using a duration that is longer than a PIFS space, that is, within the duration that is longer than a PIFS space, a terminal other than the Initiator RD sends an acknowledgment of receipt of block to the RD responder and then the RD responder continues to send a frame. In this case, the Initiator RD can intercept that a channel is in a busy state and does not regain control of TXOP, thereby avoiding an operational conflict between a case where the Initiator RD continues to send another frame to the Responder RD afterwards. of the recovery of TXOP control and a case where the terminal other than the Initiator RD sends a block acknowledgment to the Responder RD. When the Initiator RD successfully demodulates the very high performance A1 signaling in the frame sent by the Responder RD but is not able to fully demodulate the frame, the Initiator RD regains control of the TXOP using the PIFS space if the frame is a single user frame and the Partial AID value in the frame is the same as the RD Initiator Partial AID value. Since the frame sent by the Responder RD to the Initiator RD is a single user frame, that is, the frame is sent only by the Responder RD to the Initiator RD, it is impossible for the Responder RD to simultaneously send a frame to the Initiator RD and the terminal other than RD Initiator. Therefore, there is no operational conflict between a case where the Initiator RD continues to send another frame to the Responder RD after the recovery of control of TXOP and a case where the terminal other than the Initiator RD sends an acknowledgment of receipt. block to responder RD. When the RD Initiator satisfies one of the following conditions, the RD Initiator regains control of TXOP using a duration that is longer than a PIFS space. The following conditions are: the frame is a multi-user frame; and the value of Partial AID in very high performance A1 signaling is different from the value of Partial AID of Initiator RD. Since the Initiator RD regains control of TXOP using a duration that is longer than a PIFS space, that is, within the duration that is longer than a PIFS space, a terminal other than the Initiator RD sends an acknowledgment of receipt of block to the RD responder and then the RD responder continues to send a frame. In this case, the Initiator RD can intercept that a channel is in a busy state, and does not regain control of TXOP, thereby avoiding an operational conflict between a case where the Initiator RD continues to send another frame to the Responder RD. after recovery of TXOP control and a case where the terminal other than the Initiator RD sends a block acknowledgment to the Responder RD.
A reverse direction responder RD disclosed in an embodiment of the present invention is described below. An RD Responder is configured so that, when the RD Responder enables a MUMIMO mode, and simultaneously sends a frame to a plurality of stations including an RD Initiator, it only requires the RD Initiator to send a block acknowledgment, so that Initiator RD is able to regain control of TXOP.
ES 2 586 774 T3
In this case, when the Initiator RD is unable to correctly demodulate a frame sent by the Responder RD, the Initiator RD regains control of TXOP using a PIFS space.
In this embodiment of the present invention, when the Responder RD enables MU-MIMO mode, and simultaneously sends a frame to a plurality of stations including the Initiator RD, only the Initiator RD is required to send an acknowledgment of receipt. block, so that Initiator RD is capable of regaining control of TXOP. Since the Responder RD only requires the Initiator RD to send a block acknowledgment and cannot require a station STA other than the Initiator RD to send a block acknowledgment. Therefore, there is no conflict between a case where the Initiator RD continues to send another frame to the Responder RD after recovery of control from TXOP and a case where the terminal other than the Initiator RD sends a block acknowledgment. Respondent RD.
Those of ordinary skill in this art can understand that all or part of the steps of the methods in the embodiments can be implemented by means of a computer program that provides instructions to relevant hardware. The program can be stored on a computer-readable storage medium. The storage medium can be a read-only memory, a magnetic disk or an optical disk, and the like.
The method and apparatus for recovering transmission timing control in a reverse direction grant disclosed in the present invention were described in detail above. Variations to the specific embodiment and scope of application can be made by those of ordinary skill in this art in accordance with the ideas of embodiments of the present invention. In conclusion, the content of this specification should not be construed as a limitation to the present invention, which is defined by the scope of protection of the appended claims.
Contents14
3 sheets
Sheet 1 Sheet 2 Sheet 3
21 members in 7 offices
Priority claims3
| Document | Office | Kind | Date |
|---|---|---|---|
| 201110276060 | China | A | |
| 201110276060 | China | – | |
| 2012072698 | China | W |
Members21
| Document | Office | Kind | |
|---|---|---|---|
| WO2013037201A1 | World Intellectual Property Organization (WIPO) | A1 | |
| CN103002592A | China | A | |
| US2013083781A1 | United States of America | A1 | |
| US2013100909A1 | United States of America | A1 | |
| EP2595439A1 | European Patent Office (EPO) | A1 | |
| KR20130052559A | Republic of Korea | A | |
| EP2595439A4 | European Patent Office (EPO) | A4 | |
| KR20140043479A | Republic of Korea | A | |
| KR101405581B1 | Republic of Korea | B1 | |
| KR101405657B1 | Republic of Korea | B1 | |
| CN103002592B | China | B | |
| US9185692B2 | United States of America | B2 | |
| US2015351124A1 | United States of America | A1 | |
| CN105208670A | China | A | |
| EP2595439B1 | European Patent Office (EPO) | B1 | |
| PT2595439T | Portugal | T | |
| ES2586774T3This record | Spain | T3 | |
| EP3136805A1 | European Patent Office (EPO) | A1 | |
| US9907089B2 | United States of America | B2 | |
| EP3136805B1 | European Patent Office (EPO) | B1 | |
| CN105208670B | China | B |
Numbers
- Publication
- 2586774
- Application
- 12770407
Titles2
- Spanish
- Método y dispositivo de recuperación del derecho de control de la oportunidad de transmisión en una concesión inversa
- English
- Method and device for recovering the right to control the transmission opportunity in a reverse concession
Classification
- CPC, 11
- H04W74/0816
- H04B7/0452
- H04W72/23
- H04B7/0613
- H04L1/1685
- H04L1/1614
- H04L2001/0092
- H04W84/12
- H04W72/20
- H04W72/0446
- H04W74/0833
- IPC, 7
- H04W72 04
- H04L1 16
- H04W74 08
- H04B7 04
- H04L5 00
- H04W84 12
- H04L1 00