Method for transition of wireless communication system to power-saving mode, and method for restarting the wireless communication system

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to power saving in a TDMA (Time Division Multiple Access) wireless communication system, and particularly to a power saving mode transition method and a restart method of the wireless communication system.

【0002】

[Conventional technology]

In the conventional TDMA wireless communication system, the base station constantly transmits and receives continuously. Further, as a method for reducing the power consumption of the mobile station, for example, as described in Japanese Patent Application Laid-Open No. 7-22998, the mobile station does not continuously receive the broadcast information from the base station, but at super frame intervals. Methods such as intermittent reception have been proposed.

【0003】

FIG. 9 is a configuration diagram showing a configuration of a conventional TDMA wireless communication system. In the figure, 1 is a base station and 2 is a mobile station. The base station 1 continuously transmits control information to the mobile station 2 at all times using the downlink control channel. Further, in order to receive a call request from the mobile station 2, the base station 1 is always in a continuous reception state. The mobile station 2 performs a reception operation only at least at the timing when the call signal from the base station 1, that is, the paging is transmitted, and is kept in the non-reception state at other times. Therefore, by performing such intermittent reception, the mobile station 2 is trying to reduce the power consumption of the receiver portion.

【0004】

FIG. 10 shows an example of a frame configuration of a downlink control channel for explaining the intermittent reception of the mobile station 2 described above. Base station 1 uses the control channel to transmit control information frame by frame. The control information includes broadcast information BCCH, paging PCH, and various other information. The configuration of this downlink control channel is such that the control slots transmitted for each frame are arranged in order, and one control information is configured by the super frame. Mobile station 2 only needs to be able to receive at least the paging PCH, and when it is in a power saving state, it turns on the power of the receiver at the beginning of the super frame to start the reception operation, and turns off the power at the end of the paging PCH. A power control method is used to return to the power saving state again.

【0005】

[Problems to be Solved by the Invention]

The power saving mode transition method of the conventional TDMA wireless communication system is configured as described above, but the base station 1 is placed in the continuous transmission / reception state. This is a natural condition in a private system such as a mobile phone. However, in public business systems and disaster prevention administration systems, the line usage rate drops depending on the time of day, so it is not necessary to keep the system operating in a steady state at all times. In addition, since base stations and relay stations transmit with high power, it is inefficient to perform continuous transmission at all times. In particular, when using a battery in the event of a disaster or the like, there are problems such as sudden consumption of the battery.

【0006】

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a power saving mode transition method and a restart method of a wireless communication system capable of saving energy in the entire system.

【0007】

[Means to solve problems]

In the power saving mode transition method of the wireless communication system according to the present invention, in a TDMA wireless communication system composed of a base station and a plurality of terminal stations, the base station transmits a power saving mode transition instruction to a plurality of terminal stations. , The terminal station that received this power saving mode transition instruction sends its own station status and transition instruction confirmation to the base station, and then shifts to the intermittent reception operation, and the base station that receives the terminal station's own station status and transition instruction confirmation notifies The continuous transmission of information is switched to the intermittent transmission operation that coincides with the timing of the intermittent reception operation of the terminal station, and the system shifts to the intermittent reception operation.

【0008】

In the power saving mode transition method of the wireless communication system according to the present invention, a parameter that allows the terminal station to recognize that it is in the power saving mode is included in the notification information intermittently transmitted from the base station and transmitted, and the terminal station transmits the notification information. It is possible to shift to the intermittent reception operation in the power saving mode even after receiving the power.

【0009】

The method for restarting the wireless communication system according to the present invention is a TDMA wireless communication system composed of a base station and a plurality of terminal stations, in which the base station transmits a power saving mode transition instruction to the plurality of terminal stations. After the terminal station that received the power saving mode transition instruction sends its own station status and transition instruction confirmation to the base station, it shifts to the intermittent reception operation, and the base station that receives the terminal station's own station status and transition instruction confirmation receives the notification information. The continuous transmission is switched to the intermittent transmission operation that matches the timing of the intermittent reception operation of the terminal station, and the system shifts to the intermittent transmission / reception operation to form a power saving mode, and the base station restarts the system for a plurality of terminal stations in a predetermined period. The instruction is transmitted at the timing of the intermittent reception operation of the terminal station to return to the continuous transmission / reception operation, and the terminal station receives the system restart instruction at the time of the intermittent reception operation and returns to the continuous reception operation.

【0010】

The method for restarting the wireless communication system according to the present invention is a TDMA wireless communication system composed of a base station and a plurality of terminal stations, in which the base station transmits a power saving mode transition instruction to the plurality of terminal stations. After the terminal station that received the power saving mode transition instruction sends its own station status and transition instruction confirmation to the base station, it shifts to the intermittent reception operation, and the base station that receives the terminal station's own station status and transition instruction confirmation receives the notification information. The continuous transmission is switched to the intermittent transmission operation that matches the timing of the intermittent reception operation of the terminal station, and the operation shifts to the intermittent transmission / reception operation to form the power saving mode. A system restart request for making a call is sent to the base station at the timing of, and the base station that receives this system restart request instructs all terminal stations during intermittent reception operation to restart the system. Is transmitted within a predetermined period and at the timing of the intermittent reception operation of the terminal station to return to the continuous transmission / reception operation, and the terminal station receiving the system restart instruction returns to the continuous reception operation.

【0011】

The power saving mode transition method of the wireless communication system according to the present invention is a TDMA wireless communication system composed of a master station, a relay station and a plurality of slave stations, in which the master station saves power to the relay station and the plurality of slave stations. The mode transition instruction is transmitted, and the slave station that receives this power saving mode transition instruction transmits its own station status and the transition instruction confirmation to the relay station to move to the intermittent reception operation, and the relay station receives the slave station's own station status. After sending the transition instruction confirmation to the master station, the transmission operation is stopped and the operation shifts to the intermittent reception operation, and the master station receives the slave station's own station status and the transition instruction confirmation, stops the transmission of the broadcast information, and stops the slave station. The operation shifts to the intermittent reception operation that matches the intermittent reception operation.

【0012】

The method for restarting the wireless communication system according to the present invention is a TDMA wireless communication system composed of a master station, a relay station and a plurality of slave stations, in which the master station shifts to a power saving mode for the relay station and the plurality of slave stations. The slave station that sends the instruction and receives this power saving mode transition instruction sends its own station status and transition instruction confirmation to the relay station and shifts to the intermittent reception operation, and the relay station receives the slave station's own station status and transition. After sending the instruction confirmation to the master station, the transmission operation is stopped and the operation shifts to the intermittent reception operation, and the master station receives the own station status of the slave station and the transition instruction confirmation and stops the transmission of the broadcast information to interrupt the slave station. The power saving mode is formed by shifting to the intermittent reception operation that matches the reception operation, and the master station sends a system restart request to the relay station at the timing of the intermittent reception operation of the relay station, and sends a system restart request. The received relay station sends a system restart instruction to the master station and all slave stations at the timing of the intermittent reception operation of the master station and slave stations, returns to the continuous transmission / reception operation, and receives the system restart instruction. The master station returns to the continuous transmission / reception operation, and the slave station that receives the system restart instruction returns to the continuous reception operation.

【0013】

The method for restarting the wireless communication system according to the present invention is a TDMA wireless communication system composed of a master station, a relay station and a plurality of slave stations, in which the master station shifts to a power saving mode for the relay station and the plurality of slave stations. The slave station that sends the instruction and receives this power saving mode transition instruction sends its own station status and transition instruction confirmation to the relay station and shifts to the intermittent reception operation, and the relay station receives the slave station's own station status and transition. After sending the instruction confirmation to the master station, the transmission operation is stopped and the operation shifts to the intermittent reception operation, and the master station receives the own station status of the slave station and the transition instruction confirmation and stops the transmission of the broadcast information to interrupt the slave station. The power saving mode is formed by shifting to the intermittent reception operation that matches the reception operation, and one of the multiple slave stations sends a system restart request for calling to the relay station in the intermittent reception operation of the relay station. The relay station that sends the system restart request at the same timing and receives the system restart request sends the system restart instruction to the master station and all slave stations that are receiving intermittent reception in accordance with the timing of the intermittent reception operation of the master station and slave stations. The master station that received the system restart instruction returns to the continuous transmission / reception operation, and the slave station that receives the system restart support returns to the continuous reception operation.

【0014】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described. Embodiment 1. FIG. 1 shows a configuration of a wireless communication system according to a first embodiment of the present invention, and is a power saving mode transition method in a mobile TDMA wireless communication system composed of a base station and a plurality of mobile stations. And how to restart the system.

【0015】

In the figure, 1 is a base station and 2 is a mobile station (terminal station). 11 indicates a downlink control channel from base station 1 to each mobile station 2, and 21 indicates an uplink control channel from mobile station 2 to base station 1. During steady operation, the base station 1 uses the downlink control channel 11 to continuously transmit the broadcast information CCH to the mobile station 2 on a frame-by-frame basis. The mobile station 2 uses the uplink control channel 21 to transmit a call request signal, that is, a transmission radio status report, to the base station 1.

【0016】

First, FIG. 2 shows a connection sequence at the time of transition to the power saving mode, thereby explaining the operation of transitioning to the power saving mode. In the figure, a power saving mode transition instruction is transmitted from the base station 1 which has been in a steady state for continuous transmission / reception to the mobile station 2 by using the downlink control channel 11. Upon receiving this power saving mode transition instruction, the mobile station 2 immediately transmits its own station status and transition instruction confirmation to the base station 1, shifts to the power saving mode, switches to the intermittent reception operation, and intermittently from the base station 1. Start a CCH search to receive the transmitted broadcast information CCH. Here, the base station 1 continues to transmit the power saving mode transition instruction so that the transition instruction confirmation from each mobile station 2 can be received, but even if all the transition instruction confirmations from the mobile station 2 cannot be received, the base station 1 itself When the predetermined period has passed due to the timeout by the station timer, the mode shifts to the power saving mode.

【0017】

The base station 1 intermittently transmits the broadcast information CCH on the downlink control channel 11 in the power saving mode. As a result, the base station 1 does not need to continuously transmit with a large amount of power, so that the power consumption can be significantly reduced and the battery drive efficiency in an emergency can be improved.

【0018】

Further, the base station 1 in the power saving mode performs intermittent reception for the UW1 search that accepts the system restart request UW1 from the mobile station 2. This system restart request UW1 is transmitted to request the base station 1 to return the entire system to the steady state when the mobile station 2 wants to resume communication, and is continuously composed of a specific pattern. It is a signal. In the conventional base station, continuous reception is performed on the assumption that the call is always received, but in the first embodiment, continuous reception is not necessary because the entire system is intentionally put into a power saving state. By performing intermittent reception in this way in addition to the above-mentioned intermittent transmission, it is possible to further reduce the power consumption of the base station 1.

【0019】

On the other hand, the mobile station 2 only performs intermittent reception, that is, CCH search in accordance with the intermittent transmission timing of the broadcast information CCH of the base station 1, and stops the reception operation at other times to save power consumption. Here, the broadcast information CCH intermittently transmitted from the base station 1 includes a parameter for the mobile station 2 to recognize that the system is in the power saving mode. Therefore, if some mobile stations 2 cannot receive the power saving mode transition instruction due to inconvenience in the reception state or the power is turned off when the system enters the power saving mode, this notification is given later. By receiving the information CCH, it operates to shift to the power saving mode.

【0020】

Figure 3 shows the connection sequence of the operation in which the entire system returns from the power saving mode to the steady state at the request of the mobile station 2. In the figure, in order for any one of the mobile stations 2 to perform communication, the system restart request UW1 is first transmitted to the base station 1 at the timing of the intermittent reception operation of the base station 1. When the base station 1 receives the system restart request UW1, it uses the downlink control channel 11 to send a system restart instruction to all mobile stations 2 at the timing of the CCH search. Each mobile station 2 returns to the steady state of continuous reception as soon as it receives the system restart instruction. If there is a mobile station 2 that cannot receive the system restart instruction due to a line failure or the like, it returns to the steady state due to a timeout by its own timer. The broadcast information of the base station that has returned to the steady state includes a parameter for notifying that the base station is in the steady state. Next, the base station 1 stops transmitting the system restart instruction when the timer of its own station times out, and returns to the steady state of continuous transmission / reception. After that, the base station 1 starts continuous transmission of the broadcast information CCH, and the mobile station 2 that first sent the system restart request UW1 transmits a call request signal, that is, a transmission radio status report, and resumes communication.

【0021】

Figure 4 shows the connection sequence of the operation in which the entire system returns from the power saving mode to the steady state according to the instruction of the base station 1. In the figure, the base station 1 transmits a system restart instruction to all mobile stations 2 at the time of intermittent transmission, and each mobile station 2 receives this system restart instruction by CCH search and returns in the same manner as described above. I do. That is, each mobile station 2 returns to the steady state of continuous reception as soon as it receives the system restart instruction. Next, the base station 1 stops transmitting the system restart instruction when the timer of its own station times out, and returns to the steady state of continuous transmission / reception. After that, the base station 1 starts continuous transmission of the broadcast information CCH and is in a state of resuming communication.

【0022】

As described above, according to the first embodiment, since the base station 1 stops the transmission other than intermittently transmitting the notification information CCH in the power saving mode, continuous transmission of a large amount of power becomes unnecessary and is consumed. The effect of significantly reducing power consumption and increasing battery drive efficiency in an emergency can be obtained. Further, even in the reception operation in the power saving mode, the base station 1 stops the reception operation other than the intermittent reception operation for receiving the system restart request UW1, so that the effect of further power saving can be obtained. Be done. On the other hand, the mobile station 2 also has an effect of saving power by not performing a transmission / reception operation other than an intermittent reception operation in which the timing is adjusted for the intermittent transmission of the broadcast information CCH. Therefore, the effect of enabling a great reduction in power can be obtained in the entire wireless communication system including the base station 1 and the mobile station 2. Further, according to the first embodiment, the system can be restarted without any inconvenience in order to return from the power saving mode regardless of whether the system is instructed by the base station 1 or requested by an arbitrary mobile station 2. The effect of providing the optimum restart method for power saving of the entire wireless communication system can be obtained. Furthermore, when the system enters the power saving mode, the notification information CCH intermittently transmitted from the base station 1 includes a parameter that can recognize that the system is in the power saving mode. Even if there is a mobile station 2 that could not be received, it is possible to switch to the power saving mode from the time when the notification information CCH is received, which has the effect of making the power saving operation more reliable.

【0023】

Embodiment 2. FIG. 5 shows the wireless communication system according to the second embodiment of the present invention, and is a fixed system TDMA wireless communication composed of a master station, a relay station, and a plurality of slave stations or door-to-door receivers. The power saving mode transition method in the system and the system restart method will be described.

【0024】

In the figure, 3 is a master station, 4 is a relay station, and 5 is a slave station. 31 is the downlink control channel from the master station 3 to the relay station 4, 41 is the downlink control channel from the relay station 4 to the slave station 5, 42 is the uplink control channel from the relay station 4 to the master station 3, and 51 is the slave station 5. The uplink control channel from to relay station 4 is shown. During regular operation, the master station 3 transmits the broadcast information CCH to all the slave stations 5 using the downlink control channels 31 and 41 via the relay station 4. Further, the slave station 5 uses the uplink control channels 51 and 42 via the relay station 4 to transmit a call request signal, that is, a transmission radio status report to the master station 3.

【0025】

FIG. 6 shows the connection sequence at the time of transition to the power saving mode, thereby explaining the power saving mode transition operation. In the figure, the master station 3 operating in the steady state transmits a power saving mode transition instruction to the relay station 4 and the slave station 5 using the downlink control channels 31 and 41. Upon receiving this power saving mode transition instruction, the slave station 5 transmits its own station status and transition instruction confirmation to the master station 3 via the relay station 4, and shifts to the power saving mode. The relay station 4 shifts to the power saving mode after transmitting the transition instruction confirmation from each slave station 5 to the master station 3. Further, even if the relay station 4 cannot receive the transition instruction from all the slave stations 5, after transmitting the own station status and the transition instruction confirmation to the master station 3, the relay station 4 saves power by the timer timeout of the own station. Move to mode. The master station 3 continues to transmit the power saving mode transition instruction until it receives the transition instruction confirmation from the relay station 4, and after receiving the transition instruction confirmation from the relay station 4, shifts to the power saving mode.

【0026】

The master station 3 stops transmitting the broadcast information CCH in the power saving mode. In addition, the system shifts to the intermittent reception operation in order to perform a UW2 search for receiving the system restart instruction UW2 from the relay station 4. Here, the system restart instruction UW2 is transmitted to the master station 3 and the slave station (door-to-door receiver) 5 in order to return the entire system to the steady state, and is a continuous signal composed of a specific pattern.

【0027】

The relay station 4 stops transmission in the power saving mode. In addition, the system shifts to the intermittent reception operation in order to perform a UW1 search for accepting the system restart request UW1 from the slave station 5 or the master station 3. This system restart request UW1 requests the relay station 4 to return the entire system to the steady state in order for the slave station 5 or the master station 3 to resume communication, and is a continuous system composed of a specific pattern. It is a signal.

【0028】

In the power saving mode, the slave station 5 shifts to an intermittent reception operation in order to perform a UW2 search for receiving the system restart instruction UW2 from the relay station 4. Further, if the notification information CCH from the master station 3 is not received for a certain period of time, the slave station 5 operates so as to shift to the power saving mode due to the timer timeout of the own station.

【0029】

Figure 7 shows the connection sequence of the operation in which the entire system returns from the power saving mode to the steady state at the request of the slave station. In the figure, in order for any of the slave stations 5 to perform communication, the system restart request UW1 is first transmitted to the relay station 4 at the timing of the intermittent reception operation of the relay station 4. When the relay station 4 receives the system restart request UW1, it transmits the system restart instruction UW2 to the master station 3 and all the slave stations 5 in accordance with these intermittent reception operations, that is, the timing of the UW2 search. Upon receiving the system restart instruction UW2, the master station 3 immediately returns to the steady state and starts continuous transmission of the broadcast information CCH. Further, the slave station 5 returns to the steady state immediately after receiving the system restart instruction UW2, and continuously receives the notification information CCH. The relay station 4 stops the transmission of the system restart instruction UW2 due to the timer timeout of its own station, returns to the steady state, relays the notification information CCH from the master station 3, and transmits it to the slave station 5. After that, the slave station 5 that first transmits the system restart request UW1 transmits a call request signal, that is, a transmission radio status report, and resumes communication.

【0030】

Figure 8 shows the connection sequence of the operation in which the entire system returns from the power saving mode to the steady state according to the instruction of the master station. In the figure, the master station 3 transmits the system restart request UW1 to the relay station 4 at the timing of the UW1 search of the relay station 4. After receiving this system restart request UW1, the relay station 4 performs the same operation as described above. That is, the system restart instruction UW2 is transmitted to the master station 3 and all the slave stations 5 at the timing of intermittent reception. Upon receiving the system restart instruction UW2, the master station 3 immediately returns to the steady state and starts continuous transmission of the broadcast information CCH. Upon receiving the system restart instruction UW2, the slave station 5 returns to the steady state and continuously receives the notification information CCH. The relay station 4 stops the transmission of the system restart instruction UW2 by the timer of its own station, returns to the steady state, relays the notification information CCH from the master station 3, and continuously transmits the notification information CCH to the slave station 5.

【0031】

According to the second embodiment, since the master station 3 stops the transmission in the power saving mode, the continuous transmission of a large amount of power becomes unnecessary, the power consumption is significantly reduced, and the battery drive efficiency in an emergency is improved. The effect that can be obtained is obtained. Further, even in the reception in the power saving mode, the master station 3 stops the reception operation other than the intermittent reception operation for receiving the system restart instruction UW2 from the relay station 4, so that the power saving is further improved. The effect that can be achieved can be obtained. On the other hand, the relay station 4 has an effect of saving power by not performing a transmission / reception operation other than an intermittent reception operation for receiving the system restart request UW1 issued from the master station 3 and the slave station 5. Further, the slave station 5 has an effect of stopping the transmission / reception operation other than the intermittent reception operation for receiving the system restart instruction UW2 from the relay station 4 to save power. Therefore, it is possible to obtain an effect that enables a great reduction in power consumption in the entire wireless communication system including the master station 3, the relay station 4, and the slave station 5. Further, according to the second embodiment, the relay station 5 is included in both the case where the system is requested by the master station 3 and the case where the system is requested by the arbitrary slave station 5 in order to return from the power saving mode. Since the restart can be performed without any inconvenience, the effect of providing the optimum restart method for power saving of the entire wireless communication system can be obtained.

【0032】

[Effect of the invention]

As described above, according to the present invention, in the TDMA wireless communication system composed of a base station and a plurality of terminal stations, the base station transmits a power saving mode transition instruction to the plurality of terminal stations, and the power saving is performed. After the terminal station that received the mode transition instruction sends its own station status and transition instruction confirmation to the base station, it shifts to the intermittent reception operation, and the base station that receives the terminal station's own station status and transition instruction confirmation continuously transmits the broadcast information. Is configured to switch to the intermittent transmission operation that matches the timing of the intermittent reception operation of the terminal station and to shift to the intermittent reception operation. Therefore, the base station stops transmission except for intermittent transmission of notification information in the power saving mode. It eliminates the need for continuous transmission of high power, and has the effect of stopping the reception operation other than the intermittent reception operation to accept the system restart request to save power and improve the battery drive efficiency in an emergency. .. Further, the terminal station also has an effect of saving power by not performing a reception operation other than an intermittent reception operation in which the timing is adjusted for the intermittent transmission of the broadcast information from the base station. Therefore, there is an effect of enabling a great reduction in power consumption in the entire wireless communication system including the base station and the terminal station.

【0033】

According to the present invention, a parameter that allows the terminal station to recognize that it is in the power saving mode is included in the notification information intermittently transmitted from the base station and transmitted, and even when the terminal station receives the notification information, the power saving mode is set. Since it is configured to shift to the intermittent reception operation, even if there is a terminal station that could not receive the power saving mode transition instruction, it is possible to switch to the power saving mode from the time when the notification information is received after that, and the power saving mode can be performed. It has the effect of making the operation of the transition to more reliable.

【0034】

According to the present invention, in a TDMA wireless communication system composed of a base station and a plurality of terminal stations, the base station transmits a power saving mode transition instruction to the plurality of terminal stations and receives the power saving mode transition instruction. After the terminal station sends its own station status and transition instruction confirmation to the base station, it shifts to the intermittent reception operation, and the base station that receives the terminal station's own station status and transition instruction confirmation intermittently transmits the broadcast information. The base station switches to the intermittent transmission operation that matches the timing of the reception operation, shifts to the intermittent transmission / reception operation to form a power saving mode, and the base station intermittently receives a system restart instruction to a plurality of terminal stations during a predetermined period. The system is configured so that it transmits at the timing of the operation and returns to the continuous transmission / reception operation, and the terminal station receives the system restart instruction at the time of the intermittent reception operation and returns to the continuous reception operation. Can be restarted to recover from the power saving mode, and has the effect of providing the optimum restarting method for power saving of the entire wireless communication system.

【0035】

According to the present invention, in a TDMA wireless communication system composed of a base station and a plurality of terminal stations, the base station transmits a power saving mode transition instruction to the plurality of terminal stations and receives the power saving mode transition instruction. After the terminal station sends its own station status and transition instruction confirmation to the base station, it shifts to the intermittent reception operation, and the base station that receives the terminal station's own station status and transition instruction confirmation intermittently transmits the broadcast information. The power saving mode is formed by switching to the intermittent transmission operation that matches the timing of the reception operation and shifting to the intermittent transmission / reception operation, and any one of the plurality of terminal stations makes a call according to the timing of the intermittent reception operation of the base station. The system restart request for is sent to the base station, and the base station that received this system restart request gives the system restart instruction to all the terminal stations during the intermittent reception operation within the specified period. The system is configured so that it transmits at the timing of the intermittent reception operation of the terminal station and returns to the continuous reception operation, and the terminal station that receives the system restart instruction returns to the continuous transmission / reception operation. Can be restarted to recover from the power saving mode, and has the effect of providing the optimum restarting method for power saving of the entire wireless communication system.

【0036】

According to the present invention, in a TDMA wireless communication system composed of a master station, a relay station and a plurality of slave stations, the master station transmits a power saving mode transition instruction to the relay station and the plurality of slave stations, and this saving is performed. The slave station that receives the power mode transition instruction sends the own station status and transition instruction confirmation to the relay station and shifts to the intermittent reception operation, and the relay station sends the own station status and transition instruction confirmation of the slave station received to the master station. After that, the transmission operation is stopped and the operation shifts to the intermittent reception operation, and the master station receives the own station status of the slave station and the relay station and the transition instruction confirmation, stops the transmission of the broadcast information, and matches the intermittent reception operation of the slave station. Since it is configured to shift to the intermittent reception operation, the master station stops the transmission operation in the power saving mode to eliminate the need for continuous transmission of high power, and intermittent reception for receiving the system restart instruction from the relay station. In addition to the operation, the reception operation can be stopped, the power consumption can be significantly reduced, and the battery drive efficiency in an emergency can be improved. Further, the relay station has an effect of saving power by not performing a transmission / reception operation other than an intermittent reception operation for receiving a system restart request issued from a master station and a slave station. Further, the slave station has an effect of stopping the reception operation other than the intermittent reception operation for receiving the system restart instruction from the relay station to save power. Therefore, there is an effect that a great power reduction is possible in the entire wireless communication system including the master station, the relay station and the slave station.

【0037】

According to the present invention, in a TDMA wireless communication system composed of a master station, a relay station and a plurality of slave stations, the master station transmits a power saving mode transition instruction to the relay station and the plurality of slave stations, and this saving is performed. The slave station that received the power mode transition instruction sends its own station status and transition instruction confirmation to the relay station and shifts to the intermittent reception operation, and the relay station sends the slave station's own station status and transition instruction confirmation received to the master station. After that, the transmission operation is stopped and the operation shifts to the intermittent reception operation, and the master station receives the own station status of the slave station and the relay station and the transition instruction confirmation, stops the transmission of the broadcast information, and matches the intermittent reception operation of the slave station. The relay station receives the system restart request after the master station sends a system restart request to the relay station at the timing of the relay station's intermittent reception operation. Sends a system restart instruction to the master station and all slave stations at the timing of the intermittent reception operation of the master station and slave stations, returns to the continuous transmission / reception operation, and the master station that receives the system restart instruction continuously Since the slave station that received the system restart instruction is configured to return to the continuous reception operation after returning to the transmission / reception operation, the system can be restarted without any inconvenience at the request of the master station in order to return from the power saving mode. It has the effect of being able to provide the optimum restart method for power saving of the entire communication system.

【0038】

According to the present invention, in a TDMA wireless communication system composed of a master station, a relay station and a plurality of slave stations, the master station transmits a power saving mode transition instruction to the relay station and the plurality of slave stations, and this saving is performed. The slave station that received the power mode transition instruction sends the own station status and transition instruction confirmation to the relay station and shifts to the intermittent reception operation, and the relay station sends the own station status and transition instruction confirmation of the slave station received to the master station. After that, the transmission operation is stopped and the operation shifts to the intermittent reception operation, and the master station receives the own station status of the slave station and the relay station and the transition instruction confirmation, stops the transmission of the broadcast information, and matches the intermittent reception operation of the slave station. The power saving mode is formed by moving to the intermittent reception operation, and one of the plurality of slave stations sends a system restart request for calling to the relay station according to the timing of the intermittent reception operation of the relay station. The relay station that received this system restart request sends a system restart instruction to the master station and all slave stations that are receiving intermittent reception at the timing of the intermittent reception operation of the master station and slave stations. The system returns from the power saving mode because the master station that received the system restart instruction returns to the continuous transmission / reception operation and the slave station that receives the system restart instruction returns to the continuous reception operation. Therefore, it is possible to restart the wireless communication system without any inconvenience in response to a request from an arbitrary slave station, and there is an effect that the optimum restart method can be provided as a result of power saving of the entire wireless communication system.

[Simple explanation of drawings]

[Figure 1]

It is a block diagram which shows the wireless communication system which concerns on Embodiment 1 of this invention.

[Figure 2]

It is explanatory drawing which shows the connection sequence at the time of transition to a power saving mode in Embodiment 1. FIG.

[Fig. 3]

It is explanatory drawing which shows the connection sequence at the time of system restart in Embodiment 1. FIG.

[Fig. 4]

It is explanatory drawing which shows the connection sequence at the time of system restart in Embodiment 1. FIG.

[Fig. 5]

It is a block diagram which shows the wireless communication system in Embodiment 2 of this invention.

[Fig. 6]

It is explanatory drawing which shows the connection sequence at the time of transition to a power saving mode in Embodiment 2. FIG.

[Fig. 7]

It is explanatory drawing which shows the connection sequence at the time of system restart in Embodiment 2. FIG.

[Fig. 8]

It is explanatory drawing which shows the connection sequence at the time of system restart in Embodiment 2. FIG.

[Fig. 9]

It is a block diagram which shows the conventional TDMA wireless communication system.

[Fig. 10]

It is explanatory drawing which shows the control channel of the conventional TDMA wireless communication system.

[Explanation of symbols]

1 base station, 2 mobile station (terminal station), 3 master station, 4 relay station, 5 slave station, 11,31,41 downlink control channel, 21,42,51 uplink control channel.