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WO2024189769A1 - Système de communication sans fil et procédé de communication sans fil - Google Patents

Système de communication sans fil et procédé de communication sans fil Download PDF

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Publication number
WO2024189769A1
WO2024189769A1 PCT/JP2023/009817 JP2023009817W WO2024189769A1 WO 2024189769 A1 WO2024189769 A1 WO 2024189769A1 JP 2023009817 W JP2023009817 W JP 2023009817W WO 2024189769 A1 WO2024189769 A1 WO 2024189769A1
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WO
WIPO (PCT)
Prior art keywords
twt
wireless terminal
access point
management device
type wireless
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2023/009817
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English (en)
Japanese (ja)
Inventor
一成 間瀬
亜弥子 岩城
誉人 桐原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to PCT/JP2023/009817 priority Critical patent/WO2024189769A1/fr
Publication of WO2024189769A1 publication Critical patent/WO2024189769A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • 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 wireless LAN connection technology.
  • wireless LAN which, unlike carrier wireless such as 5G, is a wireless communication system that can be used without a license.
  • 5G carrier wireless
  • TWT Target Wake Time
  • STAs wireless terminals
  • IoT power saving
  • R-TWT Restricted-TWT
  • AP Access Point
  • N-TWT Non-TWT
  • R-TWT is used in cases where delay requirements are strict.
  • R-TWT type wireless terminals, TWT type wireless terminals, and non-TWT type wireless terminals belong to a common frequency band and wireless channel (Shared Medium), it is expected that the quiet signal will prevent TWT type wireless terminals and non-TWT type wireless terminals from interrupting, and ensure preferential access rights for R-TWT type wireless terminals.
  • the R-TWT wireless terminal will not be able to initiate a connection. This causes a delay in the communication of the R-TWT wireless terminal.
  • security cameras high priority
  • various IoT devices equipment installed with a lower priority than security cameras, such as temperature sensors
  • general users lowest priority
  • security cameras high priority
  • various IoT devices equipment installed with a lower priority than security cameras, such as temperature sensors
  • general users lowest priority
  • the present disclosure aims to ensure communication timing for R-TWT type wireless terminals in a wireless LAN system in which R-TWT type wireless terminals, TWT type wireless terminals, and non-TWT type wireless terminals can belong to a common wireless channel.
  • a management device when a non-TWT wireless terminal requests connection to an access point, a management device receives packet information from the non-TWT wireless terminal and schedule information for the R-TWT wireless terminal from the access point, and creates schedule information for the non-TWT wireless terminal, and the non-TWT wireless terminal initiates a connection with the access point based on that schedule information.
  • the present disclosure provides: An access point that performs schedule management for the R-TWT type wireless terminal and the TWT type wireless terminal; a non-TWT type wireless terminal connected to the access point via a shared wireless medium; a management device connected to the access point and the non-TWT type wireless terminal via a connection path different from the wireless medium; Equipped with When the non-TWT wireless terminal issues a connection request to the access point, the non-TWT wireless terminal notifies the management device of packet information; When a connection request is received from the non-TWT wireless terminal, the access point notifies the management device of schedule information of the R-TWT wireless terminal; The management device calculates a transmission timing of the non-TWT type wireless terminal based on packet information received from the non-TWT type wireless terminal and schedule information of the R-TWT type wireless terminal received from the access point, and notifies the non-TWT type wireless terminal of the calculated transmission timing as schedule information of the non-TWT type wireless terminal;
  • the present disclosure relates to When receiving a connection request from the non-TWT wireless terminal, the access point notifies the non-TWT wireless terminal of an authentication request; In response to the authentication request, the non-TWT wireless terminal notifies the management device in which authentication information is registered in advance of its own authentication information; The management device checks whether the authentication information from the non-TWT wireless terminal has been registered in advance; After receiving confirmation of the registration of the authentication information from the management device, the non-TWT type wireless terminal notifies the management device of the packet information in response to a request from the management device; The access point is characterized in that after receiving confirmation of registration of the authentication information of the management device, the access point notifies the management device of schedule information of the R-TWT type wireless terminal in response to a request from the management device.
  • the present disclosure relates to
  • the access point notifies the management device of schedule information of the TWT type wireless terminal together with schedule information of the R-TWT type wireless terminal;
  • the management device is characterized in that it calculates the transmission timing of the non-TWT type wireless terminal based on packet information received from the non-TWT type wireless terminal, and schedule information of the R-TWT type wireless terminal and schedule information of the TWT type wireless terminal received from the access point.
  • the present disclosure relates to the schedule information of the non-TWT type wireless terminal notified by the management device includes a transmission prohibition period during which a connection to the access point cannot be initiated;
  • the non-TWT wireless terminal starts a connection with the access point outside the transmission inhibition period based on schedule information of the non-TWT wireless terminal from the management device.
  • the present disclosure relates to
  • the schedule information of the non-TWT type wireless terminal notified by the management device includes a transmission enabled period during which a connection to the access point can be started,
  • the non-TWT wireless terminal starts a connection with the access point during the transmission enabled period based on schedule information of the non-TWT wireless terminal from the management device.
  • the present disclosure provides: An access point that performs schedule management for the R-TWT type wireless terminal and the TWT type wireless terminal; a non-TWT type wireless terminal connected to the access point via a shared wireless medium; a management device connected to the access point and a non-TWT type wireless terminal via a connection path different from the wireless medium; A wireless communication method implemented by When the non-TWT wireless terminal issues a connection request to the access point, the non-TWT wireless terminal notifies the management device of packet information; When a connection request is received from a non-TWT type wireless terminal, the access point notifies the management device of schedule information of the R-TWT type wireless terminal; The management device calculates a transmission timing of the non-TWT type wireless terminal based on packet information received from the non-TWT type wireless terminal and schedule information of the R-TWT type wireless terminal received from the access point, and notifies the non-TWT type wireless terminal of the calculated transmission timing as schedule information of the non-TWT type wireless terminal
  • the device of the present disclosure for example, a management device or an access point, can also be realized by a computer and a program, and the program can be recorded on a recording medium or provided through a network.
  • the program of the present disclosure is a program for causing a computer to realize each function of the device of the present disclosure, and is a program for causing a computer to execute each procedure of the method executed by the device of the present disclosure.
  • the present disclosure can ensure communication timing for R-TWT type wireless terminals in a wireless LAN system in which R-TWT type wireless terminals, TWT type wireless terminals, and non-TWT type wireless terminals can belong to a common wireless channel.
  • 1 is a configuration example of a wireless LAN system according to the present disclosure.
  • 2 is an example of a functional block of each device.
  • 1 is an overall flowchart.
  • 13 is an example of a terminal registration flow.
  • 13 is an example of a terminal registration flow.
  • 13 is an example of a terminal authentication flow.
  • 13 is an example of a terminal authentication flow.
  • 13 is an example of a terminal deletion flow.
  • 13 is an example of a terminal deletion flow.
  • 13 is an example of a scheduling flow for a non-TWT member.
  • 13 is an example of a scheduling flow for a non-TWT member.
  • 13 is an example of a calculation flow.
  • 13 is an example of a calculation flow.
  • 1 is an example of a normal communication flow.
  • 1 is an example of a normal communication flow.
  • 13 is an example of a scheduling flow for an R-TWT member and a TWT member.
  • 13 is an example of a scheduling flow for an
  • the wireless LAN system of this embodiment is a wireless communication system in which a plurality of wireless terminals (abbreviated as STA (Station)) 91 are wirelessly connected to an access point (abbreviated as AP (Access Point)) 92.
  • the plurality of STAs 91 are wirelessly connected to the AP 92 via a shared wireless medium (Shared Medium) 94.
  • a CF (Control Function) 93 functioning as a management device is connected to a STA 91N (non-TWT member 91N) and the AP 92 via a connection path (dashed line in Fig. 1) different from the Shared Medium 94.
  • STA91 refers to a child device in the wireless LAN system.
  • STA91 includes R-TWT members 91R, TWT members 91T, and non-TWT members 91N.
  • R-TWT members 91R represent a child device that belongs to Restricted-Target Wake Time.
  • TWT members 91T represent a child device that belongs to Target Wake Time.
  • Non-TWT members 91N represent a child device that does not belong to either Restricted-Target Wake Time or Target Wake Time.
  • Non-TWT members 91N cannot understand the quit signal sent from AP92.
  • AP92 is the parent device in the wireless LAN system. AP92 manages the schedules of R-TWT member 91R and TWT member 91T.
  • Shared Medium 94 represents a shared wireless medium (same frequency band, same channel) connecting AP 92 and each STA 91. Communication between STA 91, including non-TWT member 91N, and AP 92 is carried out via Shared Medium 94.
  • CF93 calculates the transmission timing of non-TWT member 91N based on the packet information of non-TWT member 91N received from non-TWT member 91N and the schedule information of R-TWT member 91R (and TWT member 91T as necessary) received from AP92, notifies non-TWT member 91N as the schedule information of non-TWT member 91N, and ensures the communication timing of R-TWT member 91R (and TWT member 91T as necessary).
  • the functional blocks of each device are shown in Fig. 2.
  • the AP 92 includes a wireless LAN communication IF 25 and a control communication IF 21
  • the CF 93 includes a control communication IF 1_31 and a control communication IF 2_32
  • the R-TWT member 91R and the TWT member 91T include a wireless LAN communication IF 11
  • the non-TWT member 91N includes a wireless LAN communication IF 11 and a control communication IF 12.
  • the wireless LAN communication IF11 of the R-TWT member 91R, TWT member 91T, and non-TWT member 91N are connected to the wireless LAN communication IF25 of the AP92, and serve as an interface for normal communication such as Internet connection.
  • the control communication IF12 of the non-TWT member 91N is connected to the control communication IF2_32 of the CF93, and serves as an interface for control of the non-TWT member 91N.
  • the control communication IF21 of the AP92 is connected to the control communication IF1_31 of the CF93, and serves as an interface for control of the non-TWT member 91N.
  • the external communication IF22 of the AP92 is connected to the Internet.
  • the external communication IF36 of the CF93 is connected to an external network to register and delete authentication information of the non-TWT member 91N.
  • the AP92 is equipped with a schedule management unit 23 and a signal processing unit 24.
  • the schedule management unit 23 has the function of managing, calculating, and notifying the schedules of R-TWT member 91R and TWT member 91T. In addition, in response to a request from CF93, it notifies the schedule information of R-TWT member 91R and TWT member 91T that it holds.
  • the signal processing unit 24 has the basic communication functions that wireless LANs inherently have. It mainly processes user traffic, and also processes control signals.
  • the R-TWT member 91R, TWT member 91T, and non-TWT member 91N are equipped with a signal processing unit 13.
  • the signal processing unit 13 has basic communication functions that wireless LANs inherently have. It mainly processes user traffic, and also processes control signals.
  • the non-TWT member 91N is equipped with a communication control unit 14 in addition to the above. If the notification from the schedule notification unit 35 includes a transmission prohibited period during which a connection cannot be started, the communication control unit 14 starts a connection via the wireless LAN communication IF 11 outside of the transmission prohibited period. If the notification includes a transmission possible period during which a connection can be started, the connection is started via the wireless LAN communication IF 11 during the transmission possible period.
  • the CF93 includes an information management unit 33, a schedule calculation unit 34, and a schedule notification unit 35.
  • the information management unit 33 has the functions of inquiring about and storing the schedule information of the R-TWT member 91R (and also the schedule information of the TWT member 91T as necessary), the schedule information of the non-TWT member 91N, the authentication information of the non-TWT member 91N, and the packet information of the non-TWT member 91N.
  • the information management unit 33 transmits and receives schedule information of the R-TWT member 91R (and schedule information of the TWT member 91T as necessary) and authentication information of the non-TWT member 91N to and from the AP 92 via the control communication IF1_31.
  • the information management unit 33 also transmits and receives schedule information of the non-TWT member 91N, authentication information of the non-TWT member 91N, and packet information of the non-TWT member 91N to and from the non-TWT member 91N via the control communication IF2_32.
  • the schedule calculation unit 34 receives schedule information of the R-TWT member 91R (and schedule information of the TWT member 91T as necessary) and packet information of the non-TWT member 91N from the information management unit 33, and calculates the transmission timing of the non-TWT member 91N. It also notifies the information management unit 33 and the schedule notification unit 35 of the calculated transmission timing of the non-TWT member 91N as the schedule information of the non-TWT member 91N.
  • the schedule notification unit 35 notifies the non-TWT member 91N of the schedule information of the non-TWT member 91N from the schedule calculation unit 34.
  • FIG. 3 A flowchart of the entire wireless communication method executed by this system is shown in Figure 3.
  • processes connected by solid lines indicate processes that are executed immediately after the previous process is completed.
  • Processes connected by dashed lines indicate processes that are related but have different triggers.
  • Processes connected by loops indicate processes that are periodically repeated.
  • the wireless LAN system of this embodiment executes a terminal registration flow S1, a terminal authentication flow S2, a terminal deletion flow S3, a non-TWT member 91N scheduling flow S4, normal communication S5, and a scheduling flow S6 for the R-TWT member 91R and the TWT member 91T.
  • FIG. 4 shows details of a terminal registration flow S1 when a terminal registration request is received from an external device connectable to the external communication IF of the CF 93
  • FIG. 5 shows the detailed flow with functional blocks of each device.
  • S11 in FIG. 4 and FIG. 5 An external device that can be connected to the external communication IF 36 of the CF 93 requests the CF 93 to register authentication information (for example, a MAC address) of the non-TWT member 91N.
  • the information management unit 33 of the CF 93 receives, registers, and stores the authentication information of the non-TWT member 91N via the external communication IF 36. Also, the information management unit 33 notifies the external device via the external communication IF 36 of the completion of the registration.
  • FIG. 6 shows the details of the terminal authentication flow S2 when a connection request is made from the non-TWT member 91N to the AP 92
  • FIG. 7 shows the detailed flow in functional blocks of each device.
  • (1) S21 in FIG. 6 and FIG. 7 The signal processing unit 13 of the non-TWT 91N sends a connection request to the AP 92 via the wireless LAN communication IF 11.
  • the signal processing unit 24 of the AP 92 receives a connection request from the non-TWT member 91N via the wireless LAN communication IF 25, and in response thereto, sends an authentication request via the wireless LAN communication IF 25 to the non-TWT member 91N.
  • the information management unit 33 of the CF 93 checks whether the authentication information of the non-TWT member 91N received via the control communication IF2_32 is registered in the information management unit 33. (5) S25 in FIG. If the confirmation in S24 shows that the member is not registered, the information management unit 33 of the CF 93 transmits a failure of authentication to the non-TWT member 91N via the control communication IF2_32. (6) S26 in FIG. The signal processing unit 13 of the non-TWT member 91N receives the authentication failure from the CF 93 via the control communication IF 12, and the process is completed. If the terminal authentication fails, the terminal registration flow must be repeated from S1.
  • This type of terminal authentication flow can prevent unauthorized wireless terminals from connecting to the AP.
  • FIG. 10 shows details of the scheduling flow S4 of the non-TWT member 91N executed after the terminal authentication in the terminal authentication flow S2 is successful
  • FIG. 11 shows the detailed flow shown in functional blocks of each device.
  • (1) S41 in FIG. 10 and FIG. 11 The information management unit 33 of the CF 93 requests the schedule information of the R-TWT member 91R to the AP 92 via the control communication IF1_31, and also requests the packet information of the non-TWT member 91N to the non-TWT member 91N via the control communication IF2_32.
  • the schedule management unit 23 of the AP 92 Based on a request from the CF 93, the schedule management unit 23 of the AP 92 notifies the CF 93 of the schedule information of the R-TWT member 91R via the control communication IF 21. If the schedule management unit 23 determines that the transmission timing of the non-TWT member 91N should be calculated taking into account the schedule of the TWT member 91T, it also notifies the schedule information of the TWT member 91T. (3) S46 in FIG. 10 and FIG. 11 The signal processing unit 13 of the non-TWT member 91N notifies its own packet information to the CF 93 via the control communication IF 12 based on a request received from the CF 93 via the wireless LAN communication IF 11 .
  • the schedule calculation unit 34 calculates the transmission timing of the non-TWT member 91N taking this schedule information into consideration.
  • the schedule calculation unit 34 notifies the information management unit 33 and the schedule notification unit 35 of the calculation result as the schedule information of the non-TWT member 91N.
  • This schedule information may include the transmission prohibited period of the non-TWT member 91N or may include the transmission permitted period.
  • the information management unit 33 of the CF 93 stores the results of calculation by the schedule calculation unit 34 as schedule information of the non-TWT member 91N.
  • the schedule notification unit 35 of the CF 93 notifies the non-TWT member 91N of the result of calculation by the schedule calculation unit 34 as schedule information of the non-TWT member 91N via the control communication IF2_32.
  • the communication control unit 14 of the non-TWT member 91N controls the signal processing unit 13 based on its own schedule information received from the schedule notification unit 35 via the control communication IF 12. If the received schedule information of the non-TWT member 91N includes a transmission prohibited period of the non-TWT member 91N, the communication control unit 14 stops the connection during the transmission prohibited period. If the received schedule information of the non-TWT member 91N includes a transmission permitted period of the non-TWT member 91N, the communication control unit 14 starts the connection during the transmission permitted period.
  • the schedule calculation unit 34 of the CF 93 calculates the transmission timing of the non-TWT member 91N using the schedule information of the R-TWT member 91R (and the schedule information of the TWT member 91T as necessary) managed by the AP 92 and the packet information of the non-TWT member 91N (whether or not the packet can be divided and the minimum unit of the packet).
  • the calculation flow executed by the schedule calculation unit 34 is shown in Figures 12 and 13. In Figure 13, the schedule information of the R-TWT member 91R and the TWT member 91T is taken into consideration. (1) S71 in FIG. The time of one cycle of the schedule (the number of time slots in one cycle) is confirmed. (2) S72 of FIG.
  • This calculation flow allows non-TWT members 91N to efficiently connect to the AP.
  • Fig. 15 shows an example of communication in the down direction (from the network side to the non-TWT member 91N) to the non-TWT member 91N.
  • the signal processing unit 24 of the AP 92 receives the signal from the external IF 22, processes it, and transmits the signal via the wireless LAN communication IF 25 to the non-TWT member 91N.
  • the signal processing unit 13 of the non-TWT member 91N receives and processes the signal from the AP 92 via the wireless LAN communication IF 11.
  • downstream communication Although only downstream communication is shown here, upstream communication also exists. In this case, the flow is symmetrical to downstream communication. Note that non-TWT members 91N cannot communicate unless the authentication flow is completed.
  • the schedule management unit 23 of the AP 92 calculates the communication timing and the quit signal timing (collectively referred to as schedule information) of each of the R-TWT member 91R and the TWT member 91T.
  • the schedule management unit 23 notifies the R-TWT member 91R or the TWT member 91T of the calculation result via the wireless LAN communication IF 25.
  • (2) S62 in FIG. 16 and FIG. 17 The signal processing unit 13 of the R-TWT member 91R or the TWT member 91T receives its own schedule information from the AP 92 via the wireless LAN communication IF 11, and communicates according to the schedule.
  • the wireless communication system and method disclosed herein can be applied to the information and communications industry.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente divulgation concerne un système de communication sans fil comprenant un point d'accès pour effectuer une gestion de planification pour un terminal sans fil de type R-TWT et un terminal sans fil de type TWT, un terminal sans fil de type non TWT connecté au point d'accès par l'intermédiaire d'un support sans fil partagé, et un dispositif de gestion connecté au point d'accès et au terminal sans fil de type non TWT par l'intermédiaire d'un trajet de connexion différent du support sans fil. Le terminal sans fil de type non TWT notifie au dispositif de gestion des informations de paquet lors de la demande de connexion au point d'accès. Le point d'accès notifie au dispositif de gestion des informations de planification concernant le terminal sans fil de type R-TWT lorsqu'il existe une demande de connexion provenant du terminal sans fil de type non TWT. Le dispositif de gestion calcule une synchronisation de transmission du terminal sans fil de type non TWT sur la base des informations de paquet reçues du terminal sans fil de type non TWT et des informations de planification concernant le terminal sans fil de type R-TWT reçu en provenance du point d'accès, et rapporte la synchronisation de transmission au terminal sans fil non TWT en tant qu'informations de planification concernant le terminal sans fil de type non TWT. Le terminal sans fil de type non TWT initie une connexion au point d'accès sur la base des informations de planification concernant le terminal sans fil de type non TWT reçu en provenance du dispositif de gestion.
PCT/JP2023/009817 2023-03-14 2023-03-14 Système de communication sans fil et procédé de communication sans fil Pending WO2024189769A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015512578A (ja) * 2012-03-23 2015-04-27 エルジー エレクトロニクス インコーポレイティド 無線ｌａｎシステムにおいてチャネルアクセス方法及び装置
JP2018186342A (ja) * 2017-04-24 2018-11-22 キヤノン株式会社 通信装置、制御方法、及びプログラム

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015512578A (ja) * 2012-03-23 2015-04-27 エルジー エレクトロニクス インコーポレイティド 無線ｌａｎシステムにおいてチャネルアクセス方法及び装置
JP2018186342A (ja) * 2017-04-24 2018-11-22 キヤノン株式会社 通信装置、制御方法、及びプログラム

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