WO2013125070A1 - 無線通信システム、発信元無線通信装置、宛先無線通信装置および無線通信方法 - Google Patents
無線通信システム、発信元無線通信装置、宛先無線通信装置および無線通信方法 Download PDFInfo
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- WO2013125070A1 WO2013125070A1 PCT/JP2012/069459 JP2012069459W WO2013125070A1 WO 2013125070 A1 WO2013125070 A1 WO 2013125070A1 JP 2012069459 W JP2012069459 W JP 2012069459W WO 2013125070 A1 WO2013125070 A1 WO 2013125070A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
- H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a wireless communication system that intermittently transmits and receives wireless frames.
- WiMedia UWB Ultra Wide Band
- ZigBee registered trademark
- IEEE 802.15.4 in order to reduce the power consumption of the wireless communication device, it is intermittent.
- An intermittent operation of transmitting or receiving a radio frame is performed.
- a beacon period is determined in a predetermined superframe period, and the wireless communication apparatuses exchange beacon signals within the beacon period and confirm the interconnection relationship between the wireless communication apparatuses.
- transmission or reception of radio frames is intermittently repeated based on a certain period.
- a connection management method for establishing a connection relationship between wireless communication devices by exchanging beacon signals and a wireless communication for establishing a connection relationship There is disclosed a method for exchanging information regarding a predetermined pause period with an apparatus and pausing its own operation until a predetermined pause time elapses from a predetermined time.
- each wireless communication device periodically and intermittently transmits its ID, and each wireless communication device has an ID.
- a method of performing an operation of waiting for reception of a radio frame for a certain period of time immediately after transmission of a radio frame, and a radio communication apparatus waiting for transmission of a radio frame wait for reception of an ID from a destination radio communication apparatus and receive an ID
- a method is disclosed in which when a wireless frame is transmitted immediately after reception, the destination wireless communication apparatus can receive the wireless frame during reception standby immediately after the ID.
- the restriction is that the total transmission time per hour is 360 seconds or less.
- the beacon or the ID cannot be temporarily transmitted due to the restriction on the total transmission time of the radio frames per unit time. Therefore, a wireless communication device that cannot transmit a beacon or ID, and a wireless communication device that is waiting for transmission or reception of a wireless frame are wireless until a wireless communication device that cannot transmit a beacon or ID transmits again. There is a problem in that power must be consumed unnecessarily because the frame transmission or reception standby state must be continued.
- the present invention has been made in view of the above, and in a wireless communication device waiting for transmission or reception of a wireless frame, when the communication partner wireless communication device cannot transmit an ID, the standby state
- An object of the present invention is to obtain a wireless communication system capable of stopping the communication.
- the present invention provides a wireless communication system including a transmission source wireless communication device that transmits data and a destination wireless communication device that receives the data,
- the original wireless communication device includes a transmission time total summation means for summing transmission times per unit time of a wireless frame transmitted from the device itself, and a wireless device number frame for periodically and intermittently informing the wireless device number of the device itself.
- a transmission time estimation integration means for estimating and integrating the transmission time per unit time in the future, a wireless result from the own apparatus using the integration result of the transmission time total integration means and the integration result of the transmission time estimation integration means The sum total limit excess estimated time exceeding the sum total time limit of the transmission time per unit time defined by the frame transmission time, and the sum total limit excess estimation
- a transmission limit time estimation means for estimating at least one of a total sum less than estimated time that is less than the sum limit time after the time, and a sum limit excess excess estimated time and a less than total sum limit estimate by the sum limit exceeded excess estimated time
- Source transmission control means for notifying the destination wireless communication apparatus including a time or at least one of the time, and the destination wireless communication apparatus, the destination wireless communication apparatus, the sum limit excess estimated time and the sum limit less than estimated time, Or, using at least one of the reception control means for determining whether or not to stop reception of the radio frame from the source wireless communication device, and the total sum limit excess estimated time and the sum total limit less than estimated time, or at least one
- the wireless communication system is capable of stopping a standby state when a wireless communication device that is a communication partner cannot transmit an ID in a wireless communication device that is waiting to transmit or receive a wireless frame. Play.
- FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to the first embodiment.
- FIG. 2 is a diagram illustrating a configuration example of the wireless communication apparatus according to the first embodiment.
- FIG. 3 is a diagram illustrating a format of a radio frame used in the radio communication apparatus.
- FIG. 4 is a timing chart showing how radio frames are transmitted and received in a conventional radio communication system.
- FIG. 5 is a timing chart showing how radio frames are transmitted and received in a conventional radio communication system.
- FIG. 6 is a sequence diagram illustrating a state in which radio frames are transmitted and received intermittently in the radio communication system according to the first embodiment.
- FIG. 7 is a sequence diagram illustrating a state in which radio frames are intermittently transmitted and received in the radio communication system according to the second embodiment.
- FIG. 8 is a sequence diagram illustrating a state where radio frames are intermittently transmitted and received in the radio communication system according to the third embodiment.
- FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to the present embodiment.
- the wireless communication system includes a transmission source wireless communication device 1 that transmits data and a destination wireless communication device 2 that receives data from the transmission source wireless communication device 1. Radio frames are transmitted and received between the source wireless communication device 1 and the destination wireless communication device 2.
- the data transmitting side is the source wireless communication device 1 and the data receiving side is the destination wireless communication device 2, but the source wireless communication device 1 and the destination wireless communication device 2 are wireless with the same configuration.
- a communication device may be used. Therefore, data can be transmitted from the destination wireless communication device 2 to the transmission source wireless communication device 1.
- each of the source wireless communication device 1 and the destination wireless communication device 2 is one will be described, this is an example, and a plurality of devices can be connected.
- FIG. 2 is a diagram illustrating a configuration example of the wireless communication apparatus according to the present embodiment.
- the wireless communication apparatus includes an antenna 10, a wireless transmission / reception unit 20, a baseband unit 30, and an access control unit 40.
- the antenna 10 outputs an RF signal received from another wireless communication device to the wireless transmission / reception unit 20 and transmits the RF signal input from the wireless transmission / reception unit 20 to the other wireless communication device.
- the radio transmission / reception unit 20 down-converts the RF reception signal input from the antenna 10 into an IF signal, and outputs the digitally converted baseband reception signal to the baseband unit 30. Also, the baseband transmission signal input from the baseband unit 30 is converted into an analog signal, up-converted from an IF signal to an RF signal, and output to the antenna 10 as an RF transmission signal.
- the baseband unit 30 includes a transmission signal processing unit 31 and a reception signal processing unit 32.
- the baseband unit 30 performs digital radio signal processing.
- the reception signal processing unit 32 performs demodulation processing and error correction decoding processing by performing digital signal processing on the baseband reception signal input from the wireless transmission / reception unit 20, and transmits the received wireless frame ( DATA) is output.
- the transmission signal processing unit 31 performs error correction processing on the transmission radio frame (DATA) input from the access control unit 40, performs modulation processing, and transmits the baseband transmission signal to the radio transmission / reception unit 20. Output.
- the access control unit 40 includes a transmission control unit 41, a reception control unit 42, a transmission time total summation unit 43, a transmission time estimation integration unit 44, a transmission limit time estimation unit 45, and a transmission source transmission limit time estimation unit 46. And a transmission stop time calculation unit 47.
- transmission data from a network unit or application unit (not shown) is processed and output to the baseband unit 30, so the transmission control unit 41 adds header information and an error detection code to the transmission data.
- the reception control unit 42 analyzes the received radio frame (DATA) received from the baseband unit 30 from the header information and the error detection code, extracts the received data, and outputs it to a network unit or application unit (not shown).
- the transmission control unit 41 determines whether an error has occurred on the radio line depending on whether or not the data acknowledgment frame (DACK) for the transmission radio frame (DATA) transmitted by the reception control unit 42 has been received from the destination radio communication apparatus 2. It is determined whether or not it has occurred, and retransmission control is performed to perform retransmission processing of a transmission radio frame (DATA). Further, the transmission control unit 41 generates a radio number frame (ID) for notifying the peripheral radio communication device of the radio number of its own device, and outputs it to the baseband unit 30 periodically and intermittently.
- ID radio number frame
- the transmission control unit 41 does not immediately output the transmission radio frame (DATA) to the baseband unit 30 when generating a transmission radio frame (DATA).
- the transmission control unit 41 When the transmission control unit 41 generates a transmission wireless frame (DATA), the transmission control unit 41 notifies the reception control unit 42 that the ID is received from the destination wireless communication device 2 in its own device, and then transmits data to the destination wireless communication device 2.
- a request frame (SREQ) is generated and output to the baseband unit 30.
- the transmission control unit 41 is notified by the reception control unit 42 that the transmission request acknowledgment frame (RACK) has been received from the destination wireless communication device 2 after the SREQ is output, the transmission control unit 41 waits for output.
- the frame (DATA) is output to the baseband unit 30.
- the transmission control unit 41 is notified by the reception control unit 42 that the own device has received the SREQ from the source wireless communication device 1.
- Whether or not RACK is transmitted to the source wireless communication device 1 is determined based on the connection relationship information between the own device and the source wireless communication device 1 from a network unit (not shown) or the like and is in a connection relationship Outputs RACK to the baseband unit 30.
- the transmission control unit 41 when the transmission control unit 41 is notified by the reception control unit 42 that the DATA from the transmission source wireless communication device 1 has been normally received, the transmission control unit 41 outputs the DACK addressed to the transmission source wireless communication device 1 to the baseband unit 30. To do.
- the transmission control unit 41 outputs the transmission byte length to the transmission time total summation unit 43 every time all transmission frames such as a transmission radio frame and a retransmission radio frame are transmitted. Further, the transmission control unit 41 outputs the transmission byte length and the transmission cycle of the radio number frame (ID) transmitted periodically and intermittently to the transmission time estimation integration unit 44.
- the transmission time summation unit 43 transmits the transmission time on the radio section of the transmission radio frame and the retransmission radio frame, the transmission byte length for each radio frame notified from the transmission control unit 41, a predetermined physical header size length, The sum of the transmission times per unit time that is always up-to-date, calculated from the transmission speed, etc. is integrated, and the integration result is periodically output to the transmission time limit estimation unit 45.
- the transmission time estimation integration unit 44 is an ID to be transmitted in the future based on the transmission byte length, transmission cycle, predetermined physical header size length, transmission speed, and the like of the ID notified from the transmission control unit 41. , The sum of the transmission times of the wireless section of the ID per unit time in the future is integrated, and the integration result is periodically output to the transmission limit time estimation unit 45.
- the transmission time estimation integration unit 44 periodically estimates the transmission result for the transmission limit time. It is not necessary to output to the unit 45, and it is only necessary to notify once immediately after the own apparatus is activated.
- the transmission time limit estimation unit 45 includes the latest total transmission time per unit time notified from the transmission time total integration unit 43 and the ID of the future unit time notified from the transmission time estimation integration unit 44.
- the transmission stop time calculation unit 47 calculates a time (transmission stop time) for stopping transmission of its own radio frame based on the estimated total transmission time limit excess time and the estimated transmission time less than the total transmission time limit.
- the transmission stop time can be obtained from the difference between the estimated time less than the total transmission time limit and the estimated time exceeding the total transmission time limit. Then, the transmission stop time calculating unit 47 notifies the transmission control unit 41 of the transmission stop time (transmission time total limit excess estimated time) and the transmission stop time at which the transmission of the radio frame is stopped in the own device.
- the transmission control unit 41 uses its own radio frame as at least one frame of ID, SREQ, RACK, DATA, and DACK.
- the transmission stop frame and the transmission stop time are added to generate a transmission radio frame and output it to the baseband unit 30.
- the reception control unit 42 extracts the transmission stop time and the transmission stop time of the radio frame in the source radio communication device 1 attached to the ID, SREQ, RACK, DATA, or DACK reception radio frame, and transmits the source Output to the time limit estimation unit 46.
- the transmission source transmission time limit estimation unit 46 transmits the transmission time for each transmission source wireless communication device 1 based on the transmission stop time and the transmission stop time of the wireless frame for each transmission source wireless communication device 1 notified from the reception control unit 42.
- the total limit exceeding time and the transmission time less than the total limit are calculated.
- the time less than the total transmission time limit can be obtained as the time after the transmission stop time has elapsed since the transmission stop time.
- the total transmission time limit exceeded time is the notified transmission stop time.
- the transmission source transmission time limit estimation unit 46 outputs each to the transmission stop time calculation unit 47.
- the transmission stop time calculation unit 47 calculates the transmission stop time for each source wireless communication device 1 based on the total transmission time limit exceeded time and the transmission time less than the total time limit for each transmission source wireless communication device 1. Further, the transmission control unit 41 and the reception control unit 42 are notified of the transmission stop time and the transmission stop time of the radio frame for each transmission source wireless communication device 1 using the sum limit excess time as the transmission stop time.
- the transmission control unit 41 transmits the radio frame to the source radio communication device 1 based on the radio frame transmission stop time and the transmission stop time for each source radio communication device 1 notified from the transmission stop time calculation unit 47. It is determined whether or not to stop.
- the reception control unit 42 Based on the transmission stop time and the transmission stop time of the radio frame for each source radio communication device 1 notified from the transmission stop time calculation unit 47, the reception control unit 42 receives the radio frame to the source radio communication device 1. It is determined whether or not to stop.
- FIG. 3 is a diagram illustrating a format of a radio frame used in the radio communication apparatus.
- the radio frame includes a header, data, and an error detection code.
- the header is common to each radio frame, and includes a sequence number, a destination radio communication device number, a network number, a source radio communication device number, radio frame transmission stop information, and a radio frame type.
- the radio frame is identified by the radio frame type. Data is not used in SREQ, RACK, and DACK.
- the radio frame type is ID, the radio number is stored in the data.
- the radio frame type is DATA
- the radio frame transmission stop information stores a radio frame transmission stop time and a transmission stop time given by the transmission control unit 41 of the radio communication apparatus.
- FIG. 4 is a timing chart showing how radio frames are transmitted and received in a conventional radio communication system. A case where DATA transmission from the source wireless communication apparatus to the destination wireless communication apparatus can be performed will be described.
- the source wireless communication device and the destination wireless communication device repeat the wireless device activation state and the sleep state at each intermittent cycle.
- the transmission source wireless communication device and the destination wireless communication device start the wireless device and transmit an ID to inquire the peripheral wireless communication device whether there is a frame addressed to the device itself (step S101).
- the source wireless communication device and the destination wireless communication device are in a reception waiting state for receiving a SREQ addressed to their own device immediately after transmitting the ID (step S102).
- the sleep mode is entered again.
- the source wireless communication device where the transmission data is generated immediately stops the intermittent operation, that is, sleep is stopped, the wireless device is started, and the wireless device activation state is continued until the ID transmitted from the destination wireless communication device is received. (Step S103).
- the source wireless communication device receives the ID from the destination wireless communication device (step S104), and the destination wireless communication device SREQ is transmitted (step S105).
- the destination wireless communication device When the destination wireless communication device receives the SREQ from the transmission source wireless communication device 1 (step S106), the destination wireless communication device transmits RACK to the transmission source wireless communication device (step S107).
- the source wireless communication device When the source wireless communication device receives RACK from the destination wireless communication device (step S108), the source wireless communication device transitions to a link established state between the source wireless communication device and the destination wireless communication device. Then, the transmission source wireless communication device transmits DATA to the destination wireless communication device (step S109).
- the destination wireless communication device When the destination wireless communication device normally receives DATA from the transmission source wireless communication device (step S110), the destination wireless communication device transmits DACK to the transmission source wireless communication device (step S111).
- the destination wireless communication device transitions to the intermittent operation again after the link duration timer expires (step S112).
- FIG. 5 is a timing chart showing how radio frames are transmitted and received in a conventional radio communication system. The operation when the destination wireless communication apparatus cannot transmit the ID due to the transmission time limitation and the source wireless communication apparatus cannot receive the ID from the destination wireless communication apparatus and continues the wireless device activation state is shown. Steps S101 to S103 are the same as those in FIG.
- the destination wireless communication apparatus recognizes that the transmission time limit is exceeded at the time of transmitting the previous ID, and cannot transmit the ID (step 201). Therefore, the destination wireless communication device will be in a reception state or a sleep state thereafter.
- the transmission source wireless communication device Since the source wireless communication device cannot receive the ID from the destination wireless communication device, it continues the continuous reception state until the data transmission waiting timer expires. Then, the transmission source wireless communication device discards the generated transmission data that has been waiting for transmission after the timer expires, and enters a sleep state (step S202).
- the destination wireless communication device resumes the transmission of the ID to the transmission source wireless communication device after canceling the transmission time restriction (step S203).
- the wireless communication device of the communication partner continues the continuous reception state until the DATA transmission waiting timer expires. It will be. Therefore, useless power is consumed.
- FIG. 6 is a sequence diagram showing a state in which radio frames are transmitted and received intermittently in the radio communication system according to the present embodiment.
- the transmission time limit estimation unit 45 is based on the integration results of the transmission time total integration unit 43 and the transmission time estimation integration unit 44 during transmission of transmission radio frames to the destination wireless communication device 2.
- the transmission time total limit excess estimated time and the transmission time less than the total limit estimation time are calculated (step S301).
- step S302 ID, SREQ, and RACK are transmitted and received between the source wireless communication device 1 and the destination wireless communication device 2 (step S302), and DATA can be transmitted from the source wireless communication device 1 to the destination wireless communication device 2.
- the transmission stop time calculation unit 47 and the transmission control unit 41 exceed the transmission time limit from the calculated time (the total transmission time limit excess estimated time), and perform periodic intermittent transmission (ID It is possible to grasp that transmission is not possible. Therefore, in the transmission source wireless communication device 1, before the transmission time limit is exceeded (before the total limit excess estimated time), transmission is stopped from the transmission control unit 41 to the destination wireless communication device 2 as wireless frame transmission stop information. DATA including information on time and transmission stop time is transmitted (step S303).
- the destination wireless communication device 2 When the destination wireless communication device 2 acquires the transmission stop time and the transmission stop time of the wireless frame from the transmission source wireless communication device 1, the destination wireless communication device 2 transmits DACK from the transmission control unit 41 to the transmission source wireless communication device 1.
- the link continuation with the source wireless communication device 1 is stopped without waiting for the expiration of the link duration timer, and IDs are continuously received from the source wireless communication device 1 for transmission of transmission data addressed to the source wireless communication device 1.
- the operation is stopped until the radio frame restart time (step S304).
- the resume time is the time after the transmission stop time has elapsed from the transmission stop time.
- the destination wireless communication device 2 can avoid waiting for continuous reception of wireless frames from the source wireless communication device 1 and can reduce power consumption.
- the reception control unit 42 restarts the reception operation after the elapse of the transmission stop time after the restart time, that is, the reception operation is stopped.
- the destination wireless communication device 2 acquires transmission data from a network unit (not shown) or the like
- the destination wireless communication device 2 receives the ID from the transmission source wireless communication device 1 that has resumed transmission of the ID, so that it can communicate with the transmission source wireless communication device 1.
- Transmission / reception of SREQ, RACK, DATA, and DACK is performed (step S305).
- the transmission direction of each radio frame is opposite to the direction in which the transmission source radio communication apparatus 1 transmits DATA.
- FIG. 6 shows how radio frame transmission stop information is stored in DATA, but this is an example, and if the same effect is exhibited, at least one of ID, SREQ, RACK, DATA, or DACK is shown. What is necessary is just to store in a radio
- each wireless communication device transmits per unit time.
- the source wireless communication device 1 estimated that the transmission time per unit time exceeds the specified transmission time is transmitted in advance to the destination wireless communication device 2 of the communication partner due to the excess.
- the wireless communication device 1 that is the communication partner cannot transmit the wireless frame, and is in a standby state for receiving and transmitting the wireless frame. Decided to stop.
- the destination wireless communication device 2 that recognizes in advance that the transmission source wireless communication device 1 as a communication partner cannot transmit a wireless frame stops the standby state, avoids a useless active state, and reduces power consumption. be able to.
- the source wireless communication device 1 calculates the transmission stop time based on the transmission time total limit exceeded time and the transmission time less than the total time limit, and transmits the radio frame transmission stop time and transmission stop to the destination wireless communication device 2.
- the present invention is not limited to this.
- the source wireless communication device 1 may notify the destination wireless communication device 2 of two pieces of time information: a transmission time total limit exceeded time and a transmission time less than the total time limit.
- the destination wireless communication device 2 can stop the reception and transmission standby state of the wireless frame for a period defined based on the notified two pieces of time information. In this case, the source wireless communication device 1 and the destination wireless communication device 2 can reduce the processing for calculating the transmission stop time.
- the source wireless communication device 1 has notified the destination wireless communication device 2 of two pieces of information, that is, the transmission stop time (total transmission time limit exceeded time) and the transmission stop time, but only one piece of information is notified. It is also possible. For example, when only the information on the transmission stop time is notified, the destination wireless communication device 2 can stop the standby state at the transmission stop time and return to the standby state after a period of normal intermittent operation. In addition, when only the transmission stop time is notified, the destination wireless communication device 2 can stop the immediate standby state and return to the standby state after the transmission stop time has elapsed. In either case, the effect as described above (reduction in power consumption) cannot be obtained, but the power consumption can be reduced as compared with the conventional case.
- Embodiment 2 FIG. In the present embodiment, a case where transmission wireless data and ID cannot be transmitted from the source wireless communication device 1 will be described. A different part from Embodiment 1 is demonstrated.
- FIG. 7 is a sequence diagram showing a state in which radio frames are intermittently transmitted and received in the radio communication system of the present embodiment.
- the transmission source wireless communication device 1 acquires transmission data from a network unit (not shown), etc., and after receiving the ID from the destination wireless communication device 2, performs transmission / reception of SREQ and RACK with the destination wireless communication device 2, DATA is transmitted to the destination wireless communication apparatus 2.
- the source wireless communication device 1 transmits DACK to the source wireless communication device 1 in response to the received DATA. Then, the transmission and reception of DATA and DACK are repeated between the source wireless communication device 1 and the destination wireless communication device 2 (step S401).
- the transmission time limit estimation unit 45 is based on the integration results of the transmission time total integration unit 43 and the transmission time estimation integration unit 44 during transmission of transmission radio frames to the destination wireless communication device 2.
- the transmission time total limit exceeded estimated time and the transmission time less than the total limit estimated time are calculated (step S402).
- the transmission stop time calculation unit 47 and the transmission control unit 41 exceed the transmission time limit from the calculated time, and periodic intermittent transmission (ID transmission) becomes impossible. It can be understood that continuous transmission of transmission data becomes impossible. Therefore, in the transmission source wireless communication device 1, before the transmission time limit is exceeded (before the total limit excess estimated time), transmission is stopped from the transmission control unit 41 to the destination wireless communication device 2 as wireless frame transmission stop information. DATA including the time and transmission stop time information is transmitted. Further, in the transmission source wireless communication apparatus 1, the transmission control unit 41 discards the staying transmission data that cannot be transmitted by the total limit excess estimated time based on the staying transmission data amount (step S403). . Then, the source wireless communication device 1 immediately stops the transmission of DATA.
- the destination wireless communication device 2 When the destination wireless communication device 2 acquires the transmission stop time and the transmission stop time of the wireless frame from the transmission source wireless communication device 1, the destination wireless communication device 2 transmits DACK from the transmission control unit 41 to the transmission source wireless communication device 1.
- the link continuation with the source wireless communication device 1 is stopped without waiting for the expiration of the link duration timer, and IDs are continuously received from the source wireless communication device 1 for transmission of transmission data addressed to the source wireless communication device 1.
- the operation is stopped until the radio frame restart time (step S304). Subsequent operations are the same as those in the first embodiment.
- the destination wireless communication device 2 can reduce power consumption by avoiding unnecessary waiting for continuous reception.
- the transmission source wireless communication apparatus 1 can immediately reduce transmission of transmission data, thereby reducing power consumed by wasting a wireless frame.
- the destination wireless communication device 2 stops the standby state.
- the source wireless communication device 1 discards the staying transmission data that cannot be transmitted before the estimated total limit excess time, and immediately stops the transmission of DATA.
- it is possible to reduce power consumption by avoiding a wasteful standby state in the destination wireless communication device 2 and it is also possible to reduce power consumption by avoiding wasteful radio frame transmission in the source wireless communication device 1.
- Embodiment 3 FIG. In the present embodiment, a case will be described in which transmission wireless data is transmitted from destination wireless communication apparatus 2 after transmission wireless data is transmitted from transmission source wireless communication apparatus 1. A different part from Embodiment 1, 2 is demonstrated.
- FIG. 8 is a sequence diagram showing a state in which radio frames are transmitted and received intermittently in the radio communication system according to the present embodiment.
- the transmission time limit estimation unit 45 is based on the integration results of the transmission time total integration unit 43 and the transmission time estimation integration unit 44 during transmission of transmission radio frames to the destination wireless communication device 2.
- the transmission time total limit excess estimated time and the transmission time less than the total limit estimation time are calculated (step S301).
- the transmission stop time calculation unit 47 and the transmission control unit 41 can grasp that the transmission time limit is exceeded from the calculated time and periodic intermittent transmission (ID transmission) cannot be performed. Therefore, in the transmission source wireless communication device 1, before the transmission time limit is exceeded (before the total limit excess estimated time), transmission is stopped from the transmission control unit 41 to the destination wireless communication device 2 as wireless frame transmission stop information. An ID including information on time and transmission stop time is transmitted (step S501).
- the destination wireless communication device 2 When the destination wireless communication device 2 obtains the transmission stop time and the transmission stop time of the radio frame from the transmission source wireless communication device 1, the destination wireless communication device 2 completes the transmission of DATA from the own device by the wireless frame transmission stop time of the transmission source wireless communication device 1. Determine if you can. If it is determined that the transmission of the DATA can be completed by the time when the wireless frame transmission is stopped, the destination wireless communication device 2 transmits an SREQ in order to continue the wireless frame transmission / reception operation for the DATA transmission addressed to the source wireless communication device 1 (Step S502).
- the destination wireless communication device 2 receives RACK from the transmission source wireless communication device 1 and then transmits DATA to the transmission source wireless communication device 1 and receives DACK for DATA transmitted from the transmission source wireless communication device 1 (step S503).
- the source wireless communication device 1 transmits to the destination wireless communication device 2 including the information of the transmission stop time and the transmission stop time updated from the previous ID transmission even at the next ID transmission (step S504). .
- the destination wireless communication device 2 acquires the transmission stop time and the transmission stop time of the wireless frame from the transmission source wireless communication device 1 in the same manner as in step S502, To determine whether the transmission of DATA can be completed. When it is determined that the transmission of DATA cannot be completed by the transmission stop time of the wireless frame, the destination wireless communication device 2 stops link continuation with the source wireless communication device 1 without waiting for the link duration timer to expire, The continuous ID reception operation for transmission of transmission data addressed to the source wireless communication device 1 is stopped until the radio frame restart time (step S505). Subsequent operations are the same as those in the first and second embodiments.
- the destination wireless communication device 2 determines whether or not the transmission of DATA can be completed by the transmission stop time of the wireless frame. If the data cannot be completed, the radio frame receiving operation from the transmission source radio communication device 1 is stopped. Thereby, in addition to the effects of the first embodiment, the destination wireless communication apparatus 2 can avoid a situation in which the transmission / reception operation of the radio frame is stopped more than necessary to deteriorate the DATA transmission efficiency.
- the radio communication system according to the present invention is useful for a system that transmits and receives radio frames, and is particularly suitable when radio frames are transmitted and received intermittently.
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Abstract
Description
図1は、本実施の形態の無線通信システムの構成例を示す図である。無線通信システムは、データを送信する発信元無線通信装置1と、発信元無線通信装置1からのデータを受信する宛先無線通信装置2と、から構成される。発信元無線通信装置1と宛先無線通信装置2との間で無線フレームの送受信が行われる。説明の便宜上、データの送信側を発信元無線通信装置1、データの受信側を宛先無線通信装置2としているが、発信元無線通信装置1および宛先無線通信装置2は同一の構成を備えた無線通信装置でよい。そのため、宛先無線通信装置2から発信元無線通信装置1へデータを送信することも可能である。また、発信元無線通信装置1および宛先無線通信装置2がそれぞれ1つの場合について説明するが、一例であり、それぞれ複数台接続することも可能である。
本実施の形態では、発信元無線通信装置1から送信無線データおよびIDが送信できない場合について説明する。実施の形態1と異なる部分について説明する。
本実施の形態では、発信元無線通信装置1から送信無線データを送信後に宛先無線通信装置2から送信無線データを送信する場合について説明する。実施の形態1、2と異なる部分について説明する。
2 宛先無線通信装置
10 アンテナ
20 無線送受信部
30 ベースバンド部
31 送信信号処理部
32 受信信号処理部
40 アクセス制御部
41 送信制御部
42 受信制御部
43 送信時間総和積算部
44 送信時間推定積算部
45 送信制限時刻推定部
46 発信元送信制限時刻推定部
47 送信停止時間算出部
Claims (17)
- データを送信する発信元無線通信装置および前記データを受信する宛先無線通信装置から構成される無線通信システムであって、
前記発信元無線通信装置は、
自装置から送信する無線フレームの単位時間あたりの送信時間を積算する送信時間総和積算手段と、
自装置の無線機番号を周期的および間欠的に報知する無線機番号フレームの将来における前記単位時間あたりの送信時間を推定して積算する送信時間推定積算手段と、
前記送信時間総和積算手段の積算結果および前記送信時間推定積算手段の積算結果を用いて、自装置からの無線フレームの送信時間が規定された前記単位時間あたりの送信時間の総和制限時間を超過する総和制限超過推定時刻、および前記総和制限超過推定時刻の後に前記総和制限時間未満となる総和制限未満推定時刻、または少なくとも一方を推定する送信制限時刻推定手段と、
前記総和制限超過推定時刻までに、前記総和制限超過推定時刻および前記総和制限未満推定時刻、または少なくとも一方を無線フレームに含めて前記宛先無線通信装置へ通知する発信元送信制御手段と、
を備え、
前記宛先無線通信装置は、
前記総和制限超過推定時刻および前記総和制限未満推定時刻、または少なくとも一方を用いて、前記発信元無線通信装置からの無線フレームの受信を停止するか否かを判定する受信制御手段と、
前記総和制限超過推定時刻および前記総和制限未満推定時刻、または少なくとも一方を用いて、前記発信元無線通信装置に対する無線フレームの送信を停止するか否かを判定する宛先送信制御手段と、
を備えることを特徴とする無線通信システム。 - 前記宛先無線通信装置において、前記発信元無線通信装置から前記総和制限未満推定時刻の通知を受けていた場合、
前記受信制御手段は、当該総和制限未満推定時刻を用いて、前記発信元無線通信装置からの無線フレームの受信を再開するか否かを判定し、
前記宛先送信制御手段は、当該総和制限未満推定時刻を用いて、前記発信元無線通信装置に対する無線フレームの送信を再開するか否かを判定する、
ことを特徴とする請求項1に記載の無線通信システム。 - データを送信する発信元無線通信装置および前記データを受信する宛先無線通信装置から構成される無線通信システムであって、
前記発信元無線通信装置は、
自装置から送信する無線フレームの単位時間あたりの送信時間を積算する送信時間総和積算手段と、
自装置の無線機番号を周期的および間欠的に報知する無線機番号フレームの将来における前記単位時間あたりの送信時間を推定して積算する送信時間推定積算手段と、
前記送信時間総和積算手段の積算結果および前記送信時間推定積算手段の積算結果を用いて、自装置からの無線フレームの送信時間が規定された前記単位時間あたりの送信時間の総和制限時間を超過する総和制限超過推定時刻、および前記総和制限超過推定時刻の後に前記総和制限時間未満となる総和制限未満推定時刻を推定する送信制限時刻推定手段と、
前記総和制限超過推定時刻および前記総和制限未満推定時刻を用いて、無線フレームの送信を停止する期間である送信停止時間を算出する送信停止時間算出手段と、
前記総和制限超過推定時刻までに、前記総和制限超過推定時刻および前記送信停止時間、または少なくとも一方を無線フレームに含めて前記宛先無線通信装置へ通知する発信元送信制御手段と、
を備え、
前記宛先無線通信装置は、
前記総和制限超過推定時刻および前記送信停止時間、または少なくとも一方を用いて、前記発信元無線通信装置からの無線フレームの受信を停止するか否かを判定する受信制御手段と、
前記総和制限超過推定時刻および前記送信停止時間、または少なくとも一方を用いて、前記発信元無線通信装置に対する無線フレームの送信を停止するか否かを判定する宛先送信制御手段と、
を備えることを特徴とする無線通信システム。 - 前記宛先無線通信装置において、前記発信元無線通信装置から前記送信停止時間の通知を受けていた場合、
前記受信制御手段は、当該送信停止時間を用いて、前記発信元無線通信装置からの無線フレームの受信を再開するか否かを判定し、
前記宛先送信制御手段は、当該送信停止時間を用いて、前記発信元無線通信装置に対する無線フレームの送信を再開するか否かを判定する、
ことを特徴とする請求項3に記載の無線通信システム。 - 前記発信元送信制御手段は、前記総和制限超過推定時刻までに送信できない滞留データがある場合、当該滞留データを破棄する、
ことを特徴とする請求項1~4のいずれか1つに記載の無線通信システム。 - データを受信する宛先無線通信装置とともに無線通信システムを構成する前記データを送信する発信元無線通信装置であって、
自装置から送信する無線フレームの単位時間あたりの送信時間を積算する送信時間総和積算手段と、
自装置の無線機番号を周期的および間欠的に報知する無線機番号フレームの将来における前記単位時間あたりの送信時間を推定して積算する送信時間推定積算手段と、
前記送信時間総和積算手段の積算結果および前記送信時間推定積算手段の積算結果を用いて、自装置からの無線フレームの送信時間が規定された前記単位時間あたりの送信時間の総和制限時間を超過する総和制限超過推定時刻、および前記総和制限超過推定時刻の後に前記総和制限時間未満となる総和制限未満推定時刻、または少なくとも一方を推定する送信制限時刻推定手段と、
前記総和制限超過推定時刻までに、前記総和制限超過推定時刻および前記総和制限未満推定時刻、または少なくとも一方を無線フレームに含めて前記宛先無線通信装置へ通知する発信元送信制御手段と、
を備えることを特徴とする発信元無線通信装置。 - データを受信する宛先無線通信装置とともに無線通信システムを構成する前記データを送信する発信元無線通信装置であって、
自装置から送信する無線フレームの単位時間あたりの送信時間を積算する送信時間総和積算手段と、
自装置の無線機番号を周期的および間欠的に報知する無線機番号フレームの将来における前記単位時間あたりの送信時間を推定して積算する送信時間推定積算手段と、
前記送信時間総和積算手段の積算結果および前記送信時間推定積算手段の積算結果を用いて、自装置からの無線フレームの送信時間が規定された前記単位時間あたりの送信時間の総和制限時間を超過する総和制限超過推定時刻、および前記総和制限超過推定時刻の後に前記総和制限時間未満となる総和制限未満推定時刻を推定する送信制限時刻推定手段と、
前記総和制限超過推定時刻および前記総和制限未満推定時刻を用いて、無線フレームの送信を停止する期間である送信停止時間を算出する送信停止時間算出手段と、
前記総和制限超過推定時刻までに、前記総和制限超過推定時刻および前記送信停止時間、または少なくとも一方を無線フレームに含めて前記宛先無線通信装置へ通知する発信元送信制御手段と、
を備えることを特徴とする発信元無線通信装置。 - 前記発信元送信制御手段は、前記総和制限超過推定時刻までに送信できない滞留データがある場合、当該滞留データを破棄する、
ことを特徴とする請求項6または7に記載の発信元無線通信装置。 - データを送信する発信元無線通信装置とともに無線通信システムを構成する前記データを受信する宛先無線通信装置であって、
前記発信元無線通信装置から、無線フレームの送信時間が規定された前記単位時間あたりの送信時間の総和制限時間を超過する総和制限超過推定時刻、および前記総和制限超過推定時刻の後に前記総和制限時間未満となる総和制限未満推定時刻、または少なくとも一方を通知された場合に、
前記総和制限超過推定時刻および前記総和制限未満推定時刻、または少なくとも一方を用いて、前記発信元無線通信装置からの無線フレームの受信を停止するか否かを判定する受信制御手段と、
前記総和制限超過推定時刻および前記総和制限未満推定時刻、または少なくとも一方を用いて、前記発信元無線通信装置に対する無線フレームの送信を停止するか否かを判定する宛先送信制御手段と、
を備えることを特徴とする宛先無線通信装置。 - 前記発信元無線通信装置から前記総和制限未満推定時刻の通知を受けていた場合、
前記受信制御手段は、当該総和制限未満推定時刻を用いて、前記発信元無線通信装置からの無線フレームの受信を再開するか否かを判定し、
前記宛先送信制御手段は、当該総和制限未満推定時刻を用いて、前記発信元無線通信装置に対する無線フレームの送信を再開するか否かを判定する、
ことを特徴とする請求項9に記載の宛先無線通信装置。 - データを送信する発信元無線通信装置とともに無線通信システムを構成する前記データを受信する宛先無線通信装置であって、
前記発信元無線通信装置から、無線フレームの送信時間が規定された前記単位時間あたりの送信時間の総和制限時間を超過する総和制限超過推定時刻、および無線フレームの送信を停止する期間である送信停止時間、または少なくとも一方を通知された場合に、
前記総和制限超過推定時刻および前記送信停止時間、または少なくとも一方を用いて、前記発信元無線通信装置からの無線フレームの受信を停止するか否かを判定する受信制御手段と、
前記総和制限超過推定時刻および前記送信停止時間、または少なくとも一方を用いて、前記発信元無線通信装置に対する無線フレームの送信を停止するか否かを判定する送信制御手段と、
を備えることを特徴とする宛先無線通信装置。 - 前記発信元無線通信装置から前記送信停止時間の通知を受けていた場合、
前記受信制御手段は、当該送信停止時間を用いて、前記発信元無線通信装置からの無線フレームの受信を再開するか否かを判定し、
前記宛先送信制御手段は、当該送信停止時間を用いて、前記発信元無線通信装置に対する無線フレームの送信を再開するか否かを判定する、
ことを特徴とする請求項11に記載の宛先無線通信装置。 - データを送信する発信元無線通信装置および前記データを受信する宛先無線通信装置から構成される無線通信システムにおける無線通信方法であって、
前記発信元無線通信装置が、自装置から送信する無線フレームの単位時間あたりの送信時間を積算する送信時間総和積算ステップと、
前記発信元無線通信装置が、自装置の無線機番号を周期的および間欠的に報知する無線機番号フレームの将来における前記単位時間あたりの送信時間を推定して積算する送信時間推定積算ステップと、
前記発信元無線通信装置が、前記送信時間総和積算ステップにおける積算結果および前記送信時間推定積算ステップにおける積算結果を用いて、自装置からの無線フレームの送信時間が規定された前記単位時間あたりの送信時間の総和制限時間を超過する総和制限超過推定時刻、および前記総和制限超過推定時刻の後に前記総和制限時間未満となる総和制限未満推定時刻、または少なくとも一方を推定する送信制限時刻推定ステップと、
前記発信元無線通信装置が、前記総和制限超過推定時刻までに、前記総和制限超過推定時刻および前記総和制限未満推定時刻、または少なくとも一方を無線フレームに含めて前記宛先無線通信装置へ通知する通知ステップと、
前記宛先無線通信装置が、前記総和制限超過推定時刻および前記総和制限未満推定時刻、または少なくとも一方を用いて、前記発信元無線通信装置からの無線フレームの受信を停止するか否かを判定する受信制御ステップと、
前記宛先無線通信装置が、前記総和制限超過推定時刻および前記総和制限未満推定時刻、または少なくとも一方を用いて、前記発信元無線通信装置に対する無線フレームの送信を停止するか否かを判定する送信制御ステップと、
を含むことを特徴とする無線通信方法。 - さらに、
前記宛先無線通信装置が、前記発信元無線通信装置から前記総和制限未満推定時刻の通知を受けていた場合、当該総和制限未満推定時刻を用いて、前記発信元無線通信装置からの無線フレームの受信を再開するか否かを判定する受信再開制御ステップと、
前記宛先無線通信装置が、前記発信元無線通信装置から前記総和制限未満推定時刻の通知を受けていた場合、当該総和制限未満推定時刻を用いて、前記発信元無線通信装置に対する無線フレームの送信を再開するか否かを判定する送信再開制御ステップと、
を含むことを特徴とする請求項13に記載の無線通信方法。 - データを送信する発信元無線通信装置および前記データを受信する宛先無線通信装置から構成される無線通信システムにおける無線通信方法であって、
前記発信元無線通信装置が、自装置から送信する無線フレームの単位時間あたりの送信時間を積算する送信時間総和積算ステップと、
前記発信元無線通信装置が、自装置の無線機番号を周期的および間欠的に報知する無線機番号フレームの将来における前記単位時間あたりの送信時間を推定して積算する送信時間推定積算ステップと、
前記発信元無線通信装置が、前記送信時間総和積算ステップにおける積算結果および前記送信時間推定積算ステップにおける積算結果を用いて、自装置からの無線フレームの送信時間が規定された前記単位時間あたりの送信時間の総和制限時間を超過する総和制限超過推定時刻、および前記総和制限超過推定時刻の後に前記総和制限時間未満となる総和制限未満推定時刻を推定する送信制限時刻推定ステップと、
前記総和制限超過推定時刻および前記総和制限未満推定時刻を用いて、無線フレームの送信を停止する期間である送信停止時間を算出する送信停止時間算出ステップと、
前記総和制限超過推定時刻までに、前記総和制限超過推定時刻および前記送信停止時間、または少なくとも一方を無線フレームに含めて前記宛先無線通信装置へ通知する通知ステップと、
前記宛先無線通信装置が、前記総和制限超過推定時刻および前記送信停止時間、または少なくとも一方を用いて、前記発信元無線通信装置からの無線フレームの受信を停止するか否かを判定する受信制御ステップと、
前記宛先無線通信装置が、前記総和制限超過推定時刻および前記送信停止時間、または少なくとも一方を用いて、前記発信元無線通信装置に対する無線フレームの送信を停止するか否かを判定する送信制御ステップと、
を含むことを特徴とする無線通信方法。 - さらに、
前記宛先無線通信装置が、前記発信元無線通信装置から前記送信停止時間の通知を受けていた場合、当該送信停止時間を用いて、前記発信元無線通信装置からの無線フレームの受信を再開するか否かを判定する受信再開制御ステップと、
前記宛先無線通信装置が、前記発信元無線通信装置から前記送信停止時間の通知を受けていた場合、当該送信停止時間を用いて、前記発信元無線通信装置に対する無線フレームの送信を再開するか否かを判定する送信再開制御ステップと、
を含むことを特徴とする請求項15に記載の無線通信方法。 - さらに、
前記発信元無線通信装置が、前記総和制限超過推定時刻までに送信できない滞留データがある場合、当該滞留データを破棄するデータ破棄ステップ、
を含むことを特徴とする請求項13~16のいずれか1つに記載の無線通信方法。
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US14/379,388 US9642085B2 (en) | 2012-02-24 | 2012-07-31 | Radio communication system, transmission-source radio communication apparatus, destination radio communication apparatus, and radio communication method |
JP2014500854A JP5836474B2 (ja) | 2012-02-24 | 2012-07-31 | 無線通信システム、発信元無線通信装置、宛先無線通信装置および無線通信方法 |
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TW102100669A TWI465140B (zh) | 2012-02-24 | 2013-01-09 | Wireless communication system, signal transmission source wireless communication device, wireless communication device and wireless communication method |
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JP2020162071A (ja) * | 2019-03-28 | 2020-10-01 | 富士電機株式会社 | 無線通信装置、無線通信システム、及び無線通信方法 |
JP2021022755A (ja) * | 2019-07-24 | 2021-02-18 | サイレックス・テクノロジー株式会社 | 無線アクセスポイント、無線通信端末、無線通信方法、及びプログラム |
JP7386441B2 (ja) | 2020-02-13 | 2023-11-27 | パナソニックIpマネジメント株式会社 | 無線通信装置、無線通信方法及び無線通信システム |
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DE112012005933B4 (de) | 2019-05-09 |
CN104137629B (zh) | 2018-01-30 |
JP5836474B2 (ja) | 2015-12-24 |
JPWO2013125070A1 (ja) | 2015-07-30 |
KR101643070B1 (ko) | 2016-07-26 |
TWI465140B (zh) | 2014-12-11 |
KR20140125883A (ko) | 2014-10-29 |
CN104137629A (zh) | 2014-11-05 |
US20150055530A1 (en) | 2015-02-26 |
TW201345292A (zh) | 2013-11-01 |
DE112012005933T5 (de) | 2014-12-18 |
US9642085B2 (en) | 2017-05-02 |
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