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WO2024150305A1 - Système de radiocommunication sans fil - Google Patents

Système de radiocommunication sans fil Download PDF

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Publication number
WO2024150305A1
WO2024150305A1 PCT/JP2023/000405 JP2023000405W WO2024150305A1 WO 2024150305 A1 WO2024150305 A1 WO 2024150305A1 JP 2023000405 W JP2023000405 W JP 2023000405W WO 2024150305 A1 WO2024150305 A1 WO 2024150305A1
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WO
WIPO (PCT)
Prior art keywords
controller
unit
terminal
base station
scheduler
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.)
Ceased
Application number
PCT/JP2023/000405
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English (en)
Japanese (ja)
Inventor
裕希 坂上
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/JP2023/000405 priority Critical patent/WO2024150305A1/fr
Priority to JP2024569886A priority patent/JPWO2024150305A1/ja
Publication of WO2024150305A1 publication Critical patent/WO2024150305A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS

Definitions

  • the end-to-end network can be divided into wireless and wired sections.
  • EDCA Enhanced Distributed Channel Access
  • IEEE802.11 an existing technology
  • the present disclosure aims to enable at least one of a terminal or an access point to detect an abnormality in a controller and perform scheduling of the terminal and access point on behalf of the controller.
  • the method of the present disclosure is a method executed by a terminal device of the present disclosure, determining that an abnormality has occurred in the controller device when a predetermined waiting time has elapsed since the notification unit notified the amount of data; When it is determined that the controller device has an abnormality, the controller function unit is activated.
  • the program of the present disclosure is a program for causing a computer to realize each function of the terminal device or base station device of the present disclosure, and is a program for causing a computer to execute each procedure of the method executed by the terminal device or base station device of the present disclosure.
  • At least one of the terminal and the access point can detect an abnormality in the controller and perform scheduling of the terminal and the access point on behalf of the controller.
  • the present disclosure can prevent communication interruptions without making the controller redundant, even when an abnormality occurs in the controller.
  • the terminal 91, access point 92, and controller 93 of the present disclosure function as the terminal device, base station device, and controller device of the present disclosure, respectively. These devices can also be realized by a computer and a program, and the program can be recorded on a recording medium or provided via a network.
  • the controller 93 there is only one controller 93. Therefore, if an abnormality occurs in the controller 93, quality control on a service and application basis becomes impossible. Therefore, in the present disclosure, at least one of the terminal 91 and the access point 92 operates as the controller 93.
  • terminal 91#1 to 91#N are provided.
  • Terminal 91#1 has L flow unit buffer units 15#1 to 15#L
  • terminal 91#N has M flow unit buffer units 15#1 to 15#M (not shown).
  • the application 14 is a functional unit that executes any application provided in the terminal 91 .
  • the main signal transmitting/receiving unit 17 transmits and receives data used by the application 14 .
  • the per-flow buffer unit 15 accumulates data transmitted and received by the applications for each application.
  • the data accumulated in the per-flow buffer unit 15 is temporarily collected in the main signal buffer unit 16 and transmitted from the main signal transmission/reception unit 17.
  • the data received by the main signal transmission/reception unit 17 is temporarily stored in the main signal buffer unit 16 and distributed to the per-flow buffer unit 15 according to the application.
  • the control signal transmitting/receiving unit 11 of the terminal 91 transmits and receives control signals to and from the controller 93 and the access point 92.
  • the control signal includes a scheduler transmitted by the controller 93.
  • the scheduler determines the transmission start time at which the terminal 91 and the access point 92 transmit packets.
  • the scheduler may include other allocation information such as a transmission duration and a frequency channel.
  • the notification unit 12 of the terminal 91 transmits the amount of data stored in the per-flow buffer unit 15 on a control signal, and notifies the controller 93 via the control signal transmission/reception unit 11. As a result, the amount of data to be transmitted is notified for each application. In this embodiment, the amount of data may be expressed by the amount of packets used when transmitting data.
  • the scheduler unit 13 of the terminal 91 schedules the main signal according to the scheduler received from the controller 93 .
  • the per-flow buffer unit 25 of the access point 92 accumulates data transmitted and received by the terminal 91 for each terminal 91 .
  • a main signal transmitting/receiving unit 27 of an access point 92 transmits and receives data to and from a terminal 91.
  • the data received by the main signal transmitting/receiving unit 27 is temporarily stored in a main signal buffer unit 26 and then distributed to a per-flow buffer unit 25 corresponding to the terminal 91.
  • the data stored in the per-flow buffer unit 25 is temporarily collected in a main signal buffer unit 26 and then transmitted from the main signal transmitting/receiving unit 27.
  • the main signal transmitting/receiving unit 24 of the access point 92 transmits and receives data to and from an upper network device 94.
  • the data received by the main signal transmitting/receiving unit 24 is distributed to a per-flow buffer unit 25 corresponding to the terminal 91.
  • the control signal transmitting/receiving unit 21 of the access point 92 transmits and receives control signals to and from the terminal 91 and the controller 93 .
  • the notification unit 22 of the access point 92 transmits the amount of packets stored in the per-flow buffer unit 25 on a control signal, and notifies the controller 93 via the control signal transmission/reception unit 21. In this way, the amount of data to be transmitted to each terminal 91 is notified.
  • the scheduler unit 23 of the access point 92 schedules the main signal according to the scheduler received from the controller 93 .
  • the control signal transmitting/receiving unit 31 transmits and receives control signals to and from the terminal 91 and the access point 92. For example, the control signal transmitting/receiving unit 31 receives the amount of data transmitted from the terminal 91 and the access point 92. The control signal transmitting/receiving unit 31 also transmits a scheduler generated by the scheduling unit 33 to the terminal 91 and the access point 92. The database unit 32 stores the amount of packets in the per-flow buffer unit 15. As a result, the amount of data that the terminal 91 plans to transmit is stored for each application.
  • the scheduling unit 33 performs scheduling based on the packet volume stored in the database unit 32. For example, the scheduling unit 33 assigns the transmission start time for transmitting packets with a packet volume of B11 to the terminal 91#1. This generates a scheduler that determines the transmission start times for the terminal 91 and the access point 92 to transmit packets.
  • the database unit 32 manages node numbers, buffer numbers, and packet amounts.
  • the node number is any identification information that is given in advance to the terminal 91 and the access point 92, and may include a code or the like without being limited to a number.
  • the buffer number is identification information for the per-flow buffer units 15 and 25 .
  • the amount of packets is equivalent to the amount of data stored in the per-flow buffer units 15 and 25 .
  • the terminal 91#1 is equipped in advance with a controller function unit 18.
  • the controller function unit 18 includes a controller notification unit 81, a database unit 82, and a scheduling unit 83.
  • the database unit 82 manages information similar to that of the database unit 32 provided in the controller 93.
  • the database unit 82 synchronizes with the database unit 32 by periodically acquiring information stored in the database unit 32 from the controller 93.
  • the scheduling unit 83 has the same functions as the scheduling unit 33.
  • the scheduling unit 83 may be configured to provide functions exactly equivalent to those of the controller 93.
  • the scheduling unit 83 may omit part of the calculation processing of the scheduling unit 33. This can reduce the load on the calculation processing of the terminal 91#1.
  • the transmission control performed by the controller 93 according to the amount of packets stored in each of the flow unit buffer units 15 and 25 is switched to fair control that provides equal opportunities for transmission to all of the flow unit buffer units 15 and 25. This not only simplifies the algorithm but also reduces the load on the database unit 82 due to the process of recording the amount of accumulated packets, since it is possible to ignore the amount of packets stored in each of the flow unit buffer units 15 and 25 and simply allocate transmission time in order by simple division.
  • the scheduler unit 13 determines that the controller 93 has stopped functioning and notifies the controller notification unit 81 of this.
  • the controller notification unit 81 of terminal 91#1 generates a packet indicating that it has become the controller, and notifies the other terminals 91 and access point 92 of the packet via broadcast communication from the main signal transmission/reception unit 17.
  • the destination of the packet generated by the controller notification unit 81 is not limited to broadcast (global transmission). For example, a dedicated time slot may be set in advance and that slot may be used.
  • a dedicated time slot may be set in advance and that slot may be used.
  • the packet generated by the controller notification unit 81 may be notified using the control signal NW.
  • FIG. 4 shows an example of a sequence according to this embodiment.
  • the terminal 91#1 when the application 14 transmits a packet (S111-1), the terminal 91#1 distributes the packet to the per-flow buffer units 15#1 to 15#L (S112-1), and the notification unit 12 notifies the controller 93 of the amount of packets stored in the per-flow buffer units 15#1 to 15#L (S113-1). The same applies to the other terminals 91 (S111-N to S113-N).
  • the controller function of the controller 93 is stopped during steps S111 to S113 and steps S211 to S213 (S311).
  • the scheduler unit 13 since the scheduler unit 13 does not receive the scheduler even after waiting for T wait #1, it is determined that the controller 93 is not functioning and notifies the controller notification unit 81 (S114). This starts up the controller function unit 18 of the terminal 91#1.
  • the controller notification unit 81 notifies the other terminals 91 and the access point 92 via the main signal transmission/reception unit 17 of a packet notifying that it has become the controller (S115).
  • terminal 91#1 When terminal 91#1 notifies the controller notification unit 81, it changes the destination of notifications from notification unit 12 to its own controller function unit 18 (S116-1).
  • terminal 91#N and access point 92 When terminal 91#N and access point 92 receive a packet from terminal 91#1 notifying them that they have become the controller, they change the destination of notifications from notification units 12 and 22 to terminal 91#1 (S116-N and S216).
  • the terminal 91#1 records the packet amounts of the respective per-flow buffer units 15 and 25 notified by the respective terminals 91 and the access point 92 in the database unit 82 (S118).
  • the terminal 91#1 determines the transmission start time and transmission duration of the packets stored in each of the per-flow buffer units 15 and 25 in the scheduling unit 83 based on the records in the database unit 82 (S119).
  • a scheduler is generated in the controller function unit 18.
  • the terminal 91#1 notifies each access point 92 and the terminal 91 of the scheduler generated by the scheduling unit 83 (S120).
  • Second Embodiment 6 shows an example embodiment of a wireless communication system according to the present disclosure.
  • the terminal 91 includes the controller function unit 18, but the access point 92 may include the controller function unit 28.
  • the controller function unit 28 includes a controller notification unit 81, a database unit 82, and a scheduling unit 83, as in the first embodiment.
  • the access point 92 determines that there is an abnormality in the controller 93. Then, when it is determined that there is an abnormality in the controller 93, the access point 92 activates the controller function unit 28 provided in the access point 92.
  • the access point 92 Since the access point 92 does not move frequently, by providing the access point 92 with a controller function unit 18, it is possible to operate with a single controller function unit 81 until the controller 93 is restored. This makes it easier to manage the wireless network 85 until the controller 93 is restored. Since the access point 92 handles a larger number of flows than each terminal 91 and is often a high-performance machine, the controller function unit 28 can take over the functions of the controller 93 even if the controller 93 has advanced functions.
  • terminals 91#1 and 91#2 are equipped with a controller function unit 18 in addition to the controller 93.
  • a priority is set.
  • terminal 91#1 has a higher priority than terminal 91#2.
  • the controller 93 periodically notifies the terminals 91 and access points 92 that have other redundant controller functions of the settings of its own controller. The settings are notified to terminals 91#1 and #2 by the controller 93 at regular intervals.
  • the settings notified from the controller 93 include a waiting time Twait according to the priority.
  • the settings include a waiting time Twait #1 for the terminal 91#1 and a waiting time Twait #2 for the terminal 91#2.
  • the waiting time Twait #1 is shorter than the waiting time Twait #2. Therefore, the highest priority terminal 91#1 waits for Twait #1 before notifying.
  • the second highest priority terminal 91#2 waits for Twait #2, which is set longer than Twait #1, before notifying. Thereafter, even if there are N terminals, each terminal waits for Twait #N before notifying.
  • the controller 93 stops functioning, the Twait #1 of the terminal 91#1 with higher priority is smaller than the Twait #2 of the terminal 91#2, so it determines first that the controller 93 is not functioning and notifies each terminal 91 and the access point 92 that terminal 91#1 has become the controller. Each terminal 91 and the access point 92 recognizes terminal 91#1 as the controller and changes the notification destination.
  • the controller function unit 18 may be provided in multiple terminals 91, in the access point 92, or in both the terminal 91 and the access point 92.
  • the scheduler unit 13 of the terminal 91#1 cannot detect an abnormality in the controller 93
  • the scheduler unit 13 of the terminal 91#2 can detect the abnormality in the controller 93 and perform scheduling of the terminal 91 and the access point 92 in place of the controller 93.
  • the controller 93 can determine the priority based on the following: Since there is a possibility that a terminal 91 under the wireless network 95 may leave the wireless network 95 due to movement, the priority of the access point 92 is set to be high. Furthermore, even among terminals 91, there are terminals that are not mobile devices such as mobile phones or smartphones, but are stationary terminals such as personal computers installed in stores such as cafes. Therefore, the priority of stationary terminals 91 is increased based on changes in location information. Also, based on the connection time to the wireless network 95, the priority of the access point 92 and the terminal 91 that are constantly connected to the wireless network 95 is increased. Furthermore, based on the processing capabilities of the access points 92 and terminals 91, the priority of the access points 92 and terminals 91 with higher processing capabilities is increased.
  • Control signal transmission/reception unit 12 Notification unit 13: Scheduler unit 14: Application 15: Per-flow buffer unit 16: Main signal buffer unit 17: Main signal transmission/reception unit 18, 28: Controller function unit 21: Control signal transmission/reception unit 22: Notification unit 23: Scheduler unit 24: Main signal transmission/reception unit 25: Per-flow buffer unit 26: Main signal buffer unit 27: Main signal transmission/reception unit 31: Control signal transmission/reception unit 32: Database unit 33: Scheduling unit 81: Controller notification unit 82: Database unit 83: Scheduling unit 91: Terminal 92: Access point 93: Controller 94: Upper network device 95: Wireless network

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

Abstract

L'objectif de la présente divulgation est de permettre à un terminal et/ou à un point d'accès de détecter une anomalie dans un dispositif de commande et d'effectuer une planification du terminal et du point d'accès à la place du dispositif de commande.　La présente divulgation concerne un dispositif terminal inclus dans un système de communication sans fil dans lequel le dispositif terminal est connecté à un dispositif de station de base par le biais d'un réseau sans fil, ledit dispositif terminal comprenant : une unité de planification qui acquiert, à partir du dispositif de commande, un planificateur dans lequel une heure de début de transmission du dispositif lui-même est déterminée et transmet des données conformément au planificateur ; et une unité de fonction de dispositif de commande qui détermine une heure de début de transmission à laquelle le dispositif terminal et le dispositif de station de base transmettent des données. Lorsqu'un temps d'attente prédéterminé s'est écoulé après que l'unité de notification a notifié la quantité de données, il est déterminé qu'il existe une anomalie dans le dispositif de commande, et lorsqu'il est déterminé qu'il existe une anomalie dans le dispositif de commande, l'unité de fonction de dispositif de commande est activée.
PCT/JP2023/000405 2023-01-11 2023-01-11 Système de radiocommunication sans fil Ceased WO2024150305A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2023/000405 WO2024150305A1 (fr) 2023-01-11 2023-01-11 Système de radiocommunication sans fil
JP2024569886A JPWO2024150305A1 (fr) 2023-01-11 2023-01-11

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Application Number Priority Date Filing Date Title
PCT/JP2023/000405 WO2024150305A1 (fr) 2023-01-11 2023-01-11 Système de radiocommunication sans fil

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013061700A (ja) * 2011-09-12 2013-04-04 Sony Corp 情報処理装置、情報処理方法、記録媒体および情報処理システム
JP2014053680A (ja) * 2012-09-05 2014-03-20 Mitsubishi Electric Corp 列車無線システム
JP2014183386A (ja) * 2013-03-18 2014-09-29 Hitachi Ltd 通信制御装置及び通信システム
WO2021191999A1 (fr) * 2020-03-24 2021-09-30 日本電信電話株式会社 Système de commande, procédé de commande, contrôleur, et programme

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013061700A (ja) * 2011-09-12 2013-04-04 Sony Corp 情報処理装置、情報処理方法、記録媒体および情報処理システム
JP2014053680A (ja) * 2012-09-05 2014-03-20 Mitsubishi Electric Corp 列車無線システム
JP2014183386A (ja) * 2013-03-18 2014-09-29 Hitachi Ltd 通信制御装置及び通信システム
WO2021191999A1 (fr) * 2020-03-24 2021-09-30 日本電信電話株式会社 Système de commande, procédé de commande, contrôleur, et programme

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