WO2022044234A1 - 中継方法、及び中継装置 - Google Patents
中継方法、及び中継装置 Download PDFInfo
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- WO2022044234A1 WO2022044234A1 PCT/JP2020/032486 JP2020032486W WO2022044234A1 WO 2022044234 A1 WO2022044234 A1 WO 2022044234A1 JP 2020032486 W JP2020032486 W JP 2020032486W WO 2022044234 A1 WO2022044234 A1 WO 2022044234A1
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- 238000004891 communication Methods 0.000 claims abstract description 83
- 230000005540 biological transmission Effects 0.000 description 102
- 238000011144 upstream manufacturing Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
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- 238000005516 engineering process Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 241001522296 Erithacus rubecula Species 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Definitions
- This disclosure relates to a relay method and a relay device.
- EDCA Enhanced Distributed Chanel Access
- HCCA Hybrid Coordination Foundation (HCF) Control Chain Access
- EDCA EDCA
- packets are classified into four ACs (access categories), stored in each transmission queue, and packets are transmitted according to their respective priorities. Then, before transmitting the data, it waits for a period of AIFS (Arbitration Inter Frame Spacing) and CW (contention window), and if the radio wave is not detected, the data is transmitted.
- AIFS Aribitration Inter Frame Spacing
- CW contention window
- Priority control is realized by setting parameters related to AIFS and the contention window in each transmission queue (see, for example, Non-Patent Document 1).
- HCCA is a central control type technology that allocates transmission time from the AP to each terminal.
- the AP and the terminal exchange transmission conditions and assign a transmission opportunity to each terminal (see, for example, Non-Patent Document 2).
- HCCA lacks versatility because all APs and terminals need to support HCCA.
- the purpose of this disclosure is to provide a technique for performing appropriate communication control.
- a relay device that relays communication between each terminal accommodated by wireless communication and an external device
- FIG. 1 is a diagram illustrating an example of a configuration of a communication system 1 according to an embodiment.
- the communication system 1 has an AP (access point) 10, one or more STAs (stations, terminals) 20, a control device 30, and a transmission control device 40.
- the number of each device is not limited to the example of FIG.
- the AP10, the control device 30, and the transmission control device 40 are connected by, for example, a LAN (Local Area Network) and a network such as the Internet.
- the AP10 and the STA20 are connected by wireless communication such as a wireless LAN.
- AP10 is an access point (base station) that accommodates one or more STA20s.
- the STA 20 is a terminal that connects wireless communication with the AP10 and connects to a LAN, the Internet, or the like via the AP10.
- the control device 30 may be a server located on the cloud or a network.
- the control device 30 is not essential.
- the transmission control device 40 is, for example, a device that provides a channel quiet function that controls transmission in the upstream direction (communication from the STA 20 to the Internet or the like).
- the transmission control device 40 is not essential.
- FIG. 2 is a diagram showing an example of the functional configuration of the AP 10 and the control device 30 according to the embodiment.
- the AP 10 has a transmission / reception unit 11, an STA information collection unit 12, a control device command reception unit 13, and a terminal transmission time control unit 14.
- Each of these parts may be realized by the cooperation of one or more programs installed in the AP10 and hardware such as the CPU of the AP10.
- the transmission / reception unit 11 communicates with an external device.
- the STA information collecting unit 12 acquires information on the communication quality (for example, delay, throughput, etc.) of the STA 20 and the application being used.
- the STA information collecting unit 12 may acquire various information from the STA 20 by polling or the like, for example.
- the control device command receiving unit 13 receives various commands from the control device 30.
- the terminal transmission time control unit 14 sets (determines) the transmittable time or the ratio of time for each terminal. Further, the terminal transmission time control unit 14 changes the transmittable time or the ratio of time for each terminal according to the usage rate of the transmission queue of each terminal. Further, the terminal transmission time control unit 14 changes the transmittable time for each terminal based on the information acquired by the STA information collection unit 12.
- control device 30 includes a transmission / reception unit 31, an STA / AP information collection unit 32, an AP setting unit 33, and a terminal transmission time control unit 34.
- Each of these parts may be realized by the cooperation of one or more programs installed in the control device 30 and hardware such as a CPU of the control device 30.
- the transmission / reception unit 31 communicates with an external device.
- the STA / AP information collecting unit 32 acquires information such as a delay in communication in the STA 20 and information on the application being used.
- the STA / AP information collecting unit 32 may acquire various information from the STA 20 by polling or the like, for example.
- the AP setting unit 33 transmits various commands to the AP 10.
- the terminal transmission time control unit 34 sets (determines) the transmittable time or the ratio of time for each terminal. Further, the terminal transmission time control unit 34 changes the transmittable time or the ratio of time for each terminal according to the usage rate of the transmission queue of each terminal. Further, the terminal transmission time control unit 34 changes the transmittable time or the ratio of time for each terminal based on the information acquired by the STA / AP information collection unit 32.
- FIG. 3 is a flowchart illustrating an example of processing of AP10 according to the embodiment.
- 4A and 4B are diagrams illustrating an example of controlling the time for AP10 according to the embodiment to transmit a packet to each STA 20 by using a delay queue.
- 5A, 5B, and 5C are diagrams illustrating an example of controlling the time for AP10 according to the embodiment to transmit a packet to each STA 20 by scheduling.
- FIG. 6 is a diagram illustrating an example of the time that each STA 20 according to the embodiment can transmit.
- FIG. 7 is a diagram showing the format of the Quiet element defined by IEEE 802.11h.
- FIG. 8 is a diagram illustrating an example of setting a transmission time according to the usage rate of the queue for the terminal according to the embodiment.
- FIG. 9 is a diagram illustrating an example of dynamically changing the transmittable time of each STA 20 according to the usage rate of the queue for each terminal according to the embodiment.
- FIG. 10 is a diagram illustrating an example of dynamically changing the transmittable time of each STA 20 according to the situation regarding the communication quality in the STA 20 according to the embodiment.
- each terminal 1 to 4 may be set by, for example, each terminal 1 to 4 transmitting a predetermined command to the AP10. Further, the priority of each terminal 1 to 4 may be determined by the terminal transmission time control unit 14 based on the information acquired from the terminals 1 to 4 by the STA information collecting unit 12, for example.
- step S1 the terminal transmission time control unit 14 of the AP 10 sets the terminal control parameter which is a parameter related to the communication of the STA 20.
- the terminal transmission time control unit 14 may determine a parameter related to wireless communication from AP10 to each STA 20 (downstream direction) and a parameter related to wireless communication from each STA 20 to AP10 (upstream direction).
- the terminal 1 having the highest priority is set as a time zone in which transmission is possible during the entire period of the cycle T.
- the time zone from the beginning of the cycle T to the time length P is regarded as a time zone in which transmission is not possible, and after the time length P has elapsed from the beginning in the cycle T, transmission is performed. Is considered to be a possible time zone.
- the time length during which the time length S is added to the time length P from the beginning of the cycle T is regarded as a time zone in which transmission is not possible, and the cycle is set. After the time length obtained by adding the time length S to the time length P has elapsed from the beginning of T, the time zone in which transmission is possible is set.
- the terminal transmission time control unit 14 may store each packet addressed to each STA 20 received from the network or the like in a queue for each STA 20 in the AP 10. Then, the terminal transmission time control unit 14 may set a time during which each packet stored in the queue for each STA 20 can be transmitted to each STA 20 (hereinafter, also appropriately referred to as a “first time”).
- the terminal transmission time control unit 14 may set a time during which each packet stored in the queue can be transmitted to each STA 20 by using a delay queue.
- each packet addressed to each terminal 1 to 4 is stored in a queue for each terminal, then moved to a delay queue for each terminal, and transmitted from a transmission queue (send queue). It is shown.
- the terminal transmission time control unit 14 may set a delay according to the priority as shown in FIG. 4B. In this case, the terminal transmission time control unit 14 may first determine the period T for moving each packet from the queue for each terminal to the delay queue for each terminal. The value of the period T may be set in AP10 in advance.
- the terminal transmission time control unit 14 moves each packet from the queue for each terminal to the delay queue for each terminal, the terminal transmission time control unit 14 turns the delay on and off according to the priority of each terminal 1 to 4. You may switch. In the example of FIG. 4B, the delay is turned off (no delay) in the entire period of the cycle T for the terminal 1 having the highest priority. As a result, the packet addressed to the terminal 1 having the highest priority is moved to the delay queue and transmitted without delay.
- the delay is turned on during the period T from the beginning to the time length P, and the delay is turned off after the time length P has elapsed from the beginning in the period T. Has been made. Further, for the terminal 3 and the terminal 4 having a non-priority priority, the delay is turned on during the time length obtained by adding the time length S to the time length P from the beginning of the cycle T, and the delay is turned on in the cycle T. After the time length obtained by adding the time length S to the time length P has elapsed from the beginning, the delay is turned off. Thereby, the transmission time of the packet in the downlink direction can be controlled according to the priority of each STA 20.
- the terminal transmission time control unit 14 may control the time during which each packet stored in the queue can be transmitted to each STA 20 by using scheduling.
- FIG. 5A shows that each packet addressed to each terminal 1 to 4 is stored in a queue for each terminal and then transmitted from a transmission queue (send queue) by a predetermined scheduling.
- the terminal transmission time control unit 14 may set the scheduling of priority control according to the priority as shown in FIG. 5B. In this case, the terminal transmission time control unit 14 may first determine the cycle T for moving each packet from the queue for each terminal to the transmission queue. The value of the period T may be set in AP10 in advance.
- the terminal transmission time control unit 14 moves each packet from the queue for each terminal to the transmission queue by scheduling according to the priority of each terminal 1 to 4.
- the scheduling 511 of the priority control according to the priority shown in FIG. 5B is used from the beginning of the period T to the time length P.
- the round robin regardless of the priority shown in FIG. 5B and the priority control according to the priority are combined.
- Scheduled 513 has been used.
- the round robin schedule 512 shown in FIG. 5B is used regardless of the priority.
- the terminal transmission time control unit 14 may set the second time corresponding to the first time to each STA 20 as the time during which packets can be transmitted from each STA 20 by wireless communication. Thereby, for example, it is possible to reduce the time when the communication in the upstream direction is performed and the time when the communication is performed in the downstream direction coincide with each other.
- the terminal transmission time control unit 14 first synchronizes with the above-mentioned downlink communication, sets the same period T as the downlink cycle T, and then sets the downlink communication.
- a predetermined offset may be added to the start time of the cycle T in the upstream communication.
- the terminal transmission time control unit 14 adds an offset of half the time (T / 2) of the period T, for example, to start the period T in the downward direction and the start time of the period T in the upward direction. And may be offset by half a cycle.
- each terminal 1 to 4 sends a packet to AP10 by wireless communication according to the priority of each terminal 1 to 4 and the transmission time in the downlink direction to each terminal 1 to 4.
- the transmittable time may be set respectively.
- the transmittable time may be set in the uplink direction according to the priority of each STA 20 as shown in FIG. 6 described above.
- the transmittable time may be set in the uplink direction according to the priority of each STA 20 as shown in FIG. 6 described above.
- the packet from the terminal 1 having the highest priority is transmitted without any time constraint.
- transmission is prohibited during the period T from the beginning to the time length P, and transmission is possible after the time length P has elapsed from the beginning in the period T. ing.
- transmission is prohibited during the time length obtained by adding the time length S to the time length P from the beginning of the period T, and the beginning in the period T. After the time length obtained by adding the time length S to the time length P has elapsed, transmission is possible. Thereby, the transmission time of the packet in the upstream direction can be controlled according to the priority of each STA 20.
- the terminal transmission time control unit 14 uses, for example, a Quiet election defined in IEEE 802.11h (see “7.3.2.23 Quiet election” section of Non-Patent Document 3) for each STA 20.
- the transmittable time of each STA 20 may be set.
- IEEE 802.11h is a standard defined for coexistence control of 5 GHz band wireless LAN in Europe.
- FIG. 7 shows the format of the Quiet element defined in IEEE 802.11h.
- the Quiet election is data for providing a part of the DFS (Dynamic Frequency Selection) function defined by IEEE 802.11h.
- DFS Dynamic Frequency Selection
- each STA 20 detects radar radio waves and stops transmission at the time of detection in order to avoid adverse effects on the C-band radar used for meteorological observation.
- Quiet elements are used to define the interval at which transmission does not occur on the current channel. This interval can be used by each STA 20 to make channel measurements without interference from other STAs housed in the AP10.
- the terminal transmission time control unit 14 sets a cycle T and a transmittable time in the cycle T in each AP 10 by transmitting a command specifying the values of "Quiet Duration" and "Quiet Offset" 701 to each AP 10. You may.
- the terminal transmission time control unit 14 determines whether or not to perform dynamic control (step S2).
- the terminal transmission time control unit 14 may determine that dynamic control is performed when the communication status of the specific STA 20 satisfies a predetermined condition.
- step S2 If it is determined that dynamic control is not performed (NO in step S2), the process ends.
- step S2 When it is determined to execute dynamic control (YES in step S2), the terminal control parameter is changed (step S3), and the process proceeds to step S2.
- the terminal transmission time control unit 14 changes the parameters related to the downlink and downlink wireless communication of the specific STA 20 and the other STA 20 according to the situation regarding the communication of one or more specific STA 20s.
- the situation regarding the communication of the specific STA20 includes, for example, the usage rate of the queue for the specific STA20 (the queue for the terminals of FIGS. 4A and 5A), and the situation regarding the communication quality in one or more specific STA20s.
- Information to be shown may be included.
- the information indicating the status of the communication quality in the STA 20 may include, for example, the communication quality in the STA 20 and the information indicating the application used in the STA 20.
- the terminal transmission time control unit 14 determines the time during which each packet stored in the queue for the specific STA 20 can be transmitted to the specific STA 20. It may be increased. Thereby, for example, when the downlink communication of the specific STA 20 is busy, the busyness is reduced by increasing the time during which the downlink communication of the specific STA 20 is possible (elimination of the busy). Can be promoted).
- the terminal transmission time control unit 14 sets the value of the ratio of the time length P and the period T in FIG. 4B to 10. It is shown that it should be set to%.
- FIG. 9 shows an example in which the terminal transmission time control unit 14 monitors the usage rate of the queue for each terminal and controls scheduling.
- the terminal transmission time control unit 14 transmits, for example, a command for reducing the transmission possible time in the upstream direction to the specific STA 20 when the usage rate of the queue for the specific STA 20 is equal to or higher than the threshold value. You may. Thereby, for example, when the downlink communication of the specific STA 20 is busy, the downlink communication and the uplink of the specific STA 20 are reduced in order to reduce the time during which the uplink communication of the specific STA 20 is possible. Since collision with directional communication can be reduced, the busyness can be reduced.
- the terminal transmission time control unit 14 can transmit each packet stored in the queue for another STA 20 to the other STA 20. And may send a command to the other STA 20 to reduce the transmittable time in the upstream direction.
- a collision collision between the downlink communication of the specific STA 20 and the downlink communication and the uplink communication of another STA 20.
- the terminal transmission time control unit 14 determines the time during which each packet stored in the queue for the specific STA 20 can be transmitted to the specific STA 20. It may be increased.
- the terminal transmission time control unit 14 has, for example, when the delay of the downlink communication of the specific STA 20 is equal to or greater than the threshold value and when the downlink throughput is equal to or less than the threshold value, the downlink communication of the specific STA 20 is performed. It may be determined that the quality is equal to or less than the threshold value.
- the communication quality of the specific STA 20 is low (poor)
- the communication quality can be improved by increasing the time during which the downlink communication of the specific STA 20 is possible.
- the terminal transmission time control unit 14 transmits, for example, a command for reducing the transmission possible time in the upstream direction to the specific STA 20 when the communication quality in the downlink direction of the specific STA 20 is equal to or less than the threshold value. You may. As a result, for example, in order to reduce the time during which the specific STA 20 can communicate in the uplink direction, it is possible to reduce the collision between the downlink communication and the uplink communication of the specific STA 20. The quality can be improved.
- the terminal transmission time control unit 14 can transmit each packet stored in the queue for another STA 20 to the other STA 20, for example, when the communication quality in the downlink direction of the specific STA 20 is equal to or less than the threshold value. And may send a command to the other STA 20 to reduce the time available for transmission in the upstream direction. Thereby, for example, the collision between the downlink communication of the specific STA 20 and the downlink communication and the uplink communication of another STA 20 can be reduced, so that the busy can be reduced.
- the terminal transmission time control unit 14 transfers each packet stored in the queue for the specific STA 20 to the specific STA 20.
- the transmittable time may be increased.
- the predetermined application may include, for example, an application for making a voice call, an application for making a video conference, and the like, which require low communication delay and the like.
- the terminal transmission time control unit 14 sets the time during which transmission is possible in the upstream direction to the specific STA 20. You may send a command to increase.
- the communication quality in the downlink direction and the uplink direction of the specific STA 20 can be improved.
- the terminal transmission time control unit 14 stores each packet stored in the queue for another STA 20 in the other STA 20.
- a command may be sent to the other STA 20 to reduce the transmittable time in the upward direction while reducing the transmittable time.
- the collision between the communication of the specific STA 20 and the communication of another STA 20 can be reduced, so that the communication quality of the specific STA 20 can be improved.
- the terminal transmission time control unit 14 acquires information indicating the status related to the communication quality, such as the communication quality in the STA 20 and the information indicating the application currently operating (using) in the STA 20, and performs scheduling. An example of control is shown.
- the terminal transmission time control unit 14 may set different transmittable time zones for each STA 20 having the same priority. Further, when a plurality of STAs 20 having the same priority exist, the terminal transmission time control unit 14 may set the same transmittable time zone for each STA 20 having the same priority.
- the terminal transmission time control unit 14 may set a different transmittable time zone for each STA 20 having the highest priority, for example. Further, the terminal transmission time control unit 14 sets the same transmittable time zone for each STA 20 having priority, for example, so that each STA 20 communicates within the transmittable time zone. You may do it.
- the terminal transmission time control unit 14 of the AP 10 determines and sets the terminal control parameters.
- the terminal transmission time control unit 34 of the control device 30 may determine the terminal control parameter.
- the AP setting unit 33 of the control device 30 may transmit the terminal control parameter determined by the terminal transmission time control unit 34 to the control device command receiving unit 13 of the AP 10.
- the terminal transmission time control unit 14 of the AP 10 may make settings based on the terminal control parameters received by the control device command reception unit 13.
- the transmission control device 40 may be configured to make settings for each STA 20.
- each functional block in AP10 shown in FIG. 1 may be realized by dedicated hardware (LSI, etc.), or on a general-purpose computer equipped with a processor (CPU, DSP, etc.) and memory, and on the computer. It may be realized by running software.
- LSI dedicated hardware
- CPU central processing unit
- DSP digital signal processor
- FIG. 11 shows a configuration example of the AP10 when the AP10 is realized by using a computer and software.
- the AP 10 has a processor 101, a memory 102, an auxiliary storage device 103, and an input / output device 104, and has a configuration in which these are connected by a bus.
- a program that realizes processing of AP10 is stored in the auxiliary storage device 103 (computer-readable recording medium).
- the program is read into the memory 102, and the processor 101 reads the program from the memory 102 and executes it.
- the processor 101 executes the processing of the terminal transmission time control unit 14 and the like by the program.
- the "computer-readable recording medium” may include, for example, a flexible disk, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, a hard disk built in a computer system, or the like. Further, the "computer-readable recording medium” dynamically holds the program for a short period of time, like a communication line when the program is transmitted via a network such as the Internet or a communication line such as a telephone line. It may include a program that holds a program for a certain period of time, such as a volatile memory inside a computer system that is a server or a client in that case.
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Abstract
Description
無線通信により収容する各端末と外部装置との通信を中継する中継装置が、
前記各端末へ送信する各パケットをキューに格納し、前記各パケットを前記各端末に送信する時間を第1時間に設定する第1設定処理と、
前記第1時間に応じた第2時間を、前記各端末から前記無線通信によりパケットを送信可能な時間として前記各端末に設定する第2設定処理と、
を実行する中継方法が提供される。
図1を参照し、実施形態に係る通信システム1の構成の一例について説明する。図1は、実施形態に係る通信システム1の構成の一例について説明する図である。図1の例では、通信システム1は、AP(アクセスポイント)10、1以上のSTA(ステーション、端末)20、制御装置30、及び送信制御装置40を有している。なお、各装置の数は、図1の例に限定されない。
図2を参照し、実施形態に係るAP10及び制御装置30の機能構成について説明する。図2は、実施形態に係るAP10及び制御装置30の機能構成の一例を示す図である。
図2の例では、実施形態に係るAP10は、送受信部11、STA情報収集部12、制御装置命令受信部13、及び端末送信時間制御部14を有する。これら各部は、AP10にインストールされた1以上のプログラムと、AP10のCPU等のハードウェアとの協働により実現されてもよい。
図2の例では、実施形態に係る制御装置30は、送受信部31、STA・AP情報収集部32、AP設定部33、及び端末送信時間制御部34を有する。これら各部は、制御装置30にインストールされた1以上のプログラムと、制御装置30のCPU等のハードウェアとの協働により実現されてもよい。
図3から図10を参照し、実施形態に係るAP10の処理の一例について説明する。図3は、実施形態に係るAP10の処理の一例について説明するフローチャートである。図4A及び図4Bは、実施形態に係るAP10が遅延キューを用いて各STA20にパケットを送信する時間を制御する例について説明する図である。図5A、図5B、及び図5Cは、実施形態に係るAP10がスケジューリングにより各STA20にパケットを送信する時間を制御する例について説明する図である。図6は、実施形態に係る各STA20が送信可能な時間の例について説明する図である。図7は、IEEE 802.11hで規定されるQuiet elementのフォーマットを示す図である。図8は、実施形態に係る端末用のキューの使用率に応じた送信時間を設定の例について説明する図である。図9は、実施形態に係る各端末用のキューの使用率に応じて、各STA20が送信可能な時間を動的に変更する例について説明する図である。図10は、実施形態に係るSTA20における通信品質に関する状況に応じて、各STA20が送信可能な時間を動的に変更する例について説明する図である。
端末送信時間制御部14は、ネットワーク等から受信した各STA20宛ての各パケットを、AP10における各STA20用のキューに格納してもよい。そして、端末送信時間制御部14は、各STA20用のキューに格納した各パケットを各STA20に送信可能な時間(以下で、適宜「第1時間」とも称する。)をそれぞれ設定してもよい。
端末送信時間制御部14は、図4A、及び図4Bに示すように、遅延キューを用いて、キューに格納した各パケットを各STA20に送信可能な時間を設定してもよい。図4Aには、各端末1~4宛ての各パケットが、各端末用のキューにそれぞれ格納された後、各端末用の遅延キューに移動され、送信キュー(send queue)から送信されることが示されている。
端末送信時間制御部14は、図5A、図5B、及び図5Cに示すように、スケジューリングを用いて、キューに格納した各パケットを各STA20に送信可能な時間を制御してもよい。図5Aには、各端末1~4宛ての各パケットが、各端末用のキューにそれぞれ格納された後、所定のスケジューリングにより送信キュー(send queue)から送信されることが示されている。
端末送信時間制御部14は、第1時間に応じた第2時間を、各STA20から無線通信によりパケットを送信可能な時間として各STA20に設定してもよい。これにより、例えば、上り方向の通信が行われる時間と、下り方向の通信が行われる時間とが一致することを低減できる。
端末送信時間制御部14は、例えば、特定のSTA20用のキューの使用率が閾値以上である場合に、当該特定のSTA20用のキューに格納した各パケットを当該特定のSTA20に送信可能な時間を増加させてもよい。これにより、例えば、当該特定のSTA20の下り方向の通信がビジーである場合に、当該特定のSTA20の下り方向の通信が可能な時間を増加させることにより、当該ビジーを低減(当該ビジーの解消を促進)できる。
端末送信時間制御部14は、例えば、特定のSTA20の下り方向の通信品質が閾値以下である場合に、当該特定のSTA20用のキューに格納した各パケットを当該特定のSTA20に送信可能な時間を増加させてもよい。なお、端末送信時間制御部14は、例えば、特定のSTA20の下り方向の通信の遅延が閾値以上である場合、及び下り方向のスループットが閾値以下である場合に、特定のSTA20の下り方向の通信品質が閾値以下であると判定してもよい。
端末送信時間制御部14は、例えば、特定のSTA20で現在動作(使用)しているアプリケーションが所定のアプリケーションである場合に、当該特定のSTA20用のキューに格納した各パケットを当該特定のSTA20に送信可能な時間を増加させてもよい。なお、当該所定のアプリケーションには、例えば、音声通話を行うアプリケーション、及びビデオ会議を行うアプリケーション等の、通信の低遅延等が要求されるアプリケーションが含まれてもよい。また、端末送信時間制御部14は、例えば、特定のSTA20で現在動作(使用)しているアプリケーションが当該所定のアプリケーションである場合に、当該特定のSTA20に対し、上り方向の送信可能な時間を増加させるコマンドを送信してもよい。これらにより、例えば、当該特定のSTA20で所定のアプリケーションが利用されている場合に、当該特定のSTA20の下り方向及び上り方向の通信品質を向上できる。
優先度が同一のSTA20が複数存在する場合、端末送信時間制御部14は、優先度が同一の各STA20に対して、当該各STA20で異なる送信可能時間帯を設定してもよい。また、優先度が同一のSTA20が複数存在する場合、端末送信時間制御部14は、優先度が同一の各STA20に対して、同一の送信可能時間帯を設定してもよい。
上述した例では、AP10の端末送信時間制御部14にて端末制御パラメータを決定して設定する例について説明した。これに代えて、制御装置30の端末送信時間制御部34にて端末制御パラメータを決定してもよい。そして、制御装置30のAP設定部33は、端末送信時間制御部34により決定された端末制御パラメータをAP10の制御装置命令受信部13に送信してもよい。そして、AP10の端末送信時間制御部14は、制御装置命令受信部13により受信された端末制御パラメータに基づく設定を行うようにしてもよい。
図1に示すAP10における各機能ブロックの機能を専用のハードウェア(LSI等)で実現してもよいし、プロセッサ(CPU、DSP等)とメモリとを備える汎用的なコンピュータと、当該コンピュータ上で動作するソフトウェアで実現してもよい。
10 AP
11 送受信部
12 STA情報収集部
13 制御装置命令受信部
14 端末送信時間制御部
20 STA
30 制御装置
31 送受信部
32 AP情報収集部
33 AP設定部
34 端末送信時間制御部
40 送信制御装置
Claims (5)
- 無線通信により収容する各端末と外部装置との通信を中継する中継装置が、
前記各端末へ送信する各パケットをキューに格納し、前記各パケットを前記各端末に送信する時間を第1時間に設定する第1設定処理と、
前記第1時間に応じた第2時間を、前記各端末から前記無線通信によりパケットを送信可能な時間として前記各端末に設定する第2設定処理と、
を実行する中継方法。 - 前記第2設定処理では、
IEEE 802.11hで規定されるQuiet elementを用いて前記各端末に設定する、
請求項1に記載の中継方法。 - 前記第2設定処理では、
第1優先度の第1端末と、前記第1優先度よりも低い第2優先度の第2端末とに対し、前記無線通信によりパケットを送信可能な時間の周期を同一に設定し、
前記周期における前記第1端末が前記無線通信によりパケットを送信可能な時間長を第1時間長に設定し、
前記周期における前記第2端末が前記無線通信によりパケットを送信可能な時間長を前記第1時間長よりも短い第2時間長に設定する、
請求項1または2に記載の中継方法。 - 前記第2設定処理では、
前記キューの使用率、前記第1端末における通信品質、及び前記第1端末で使用しているアプリケーションを示す情報の少なくとも一つに基づいて、前記第1時間長を変更する、
請求項3に記載の中継方法。 - 無線通信により収容する各端末と外部装置との通信を中継する送受信部と、
前記各端末へ送信する各パケットをキューに格納し、前記各パケットを前記各端末に送信する時間を第1時間に設定する第1設定処理と、
前記第1時間に応じた第2時間を、前記各端末から前記無線通信によりパケットを送信可能な時間として前記各端末に設定する第2設定処理と、
を実行する制御部と、
を有する中継装置。
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US20110305216A1 (en) * | 2009-02-18 | 2011-12-15 | Lg Electronics Inc. | Method of controlling channel access |
JP2012195971A (ja) * | 2012-07-10 | 2012-10-11 | Toshiba Corp | 無線通信装置、端末、通信制御方法及び通信プログラム |
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US20110305216A1 (en) * | 2009-02-18 | 2011-12-15 | Lg Electronics Inc. | Method of controlling channel access |
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