WO2024013817A1 - Système de radiocommunication, procédé de radiocommunication, dispositif de commande centralisée et programme de commande centralisée - Google Patents

Système de radiocommunication, procédé de radiocommunication, dispositif de commande centralisée et programme de commande centralisée Download PDF

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Publication number
WO2024013817A1
WO2024013817A1 PCT/JP2022/027294 JP2022027294W WO2024013817A1 WO 2024013817 A1 WO2024013817 A1 WO 2024013817A1 JP 2022027294 W JP2022027294 W JP 2022027294W WO 2024013817 A1 WO2024013817 A1 WO 2024013817A1
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WIPO (PCT)
Prior art keywords
base station
traffic
wireless
base stations
accommodated
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PCT/JP2022/027294
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English (en)
Japanese (ja)
Inventor
純一 岩谷
ヒランタ アベセカラ
裕介 淺井
朗 岸田
花絵 大谷
信也 大槻
陸 大宮
泰司 鷹取
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日本電信電話株式会社
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Priority to PCT/JP2022/027294 priority Critical patent/WO2024013817A1/fr
Publication of WO2024013817A1 publication Critical patent/WO2024013817A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to a wireless communication system, a wireless communication method, a centralized control device, and a centralized control program.
  • IEEE802.11 wireless LAN
  • MLD multilink device
  • Multilink transmission includes, for example, an AP MLD equipped with multiple base station (AP: Access Point) functions in one housing, and multiple wireless terminals (STA: Station) installed in one housing. This is wireless communication in which a link is formed between each STA and MLD.
  • AP Access Point
  • STA Station
  • RATOP Resource allocation based on Area Throughput Optimization Policy
  • RATOP Resource allocation based on Area Throughput Optimization Policy
  • a centralized control device grasps the status of each AP and allocates radio resources such as frequency channels and bandwidths that each AP should use.
  • the amount of traffic that can be sent out based on the allocated radio resources is calculated based on the estimated maximum traffic amount (accommodated traffic amount) of each AP.
  • the ratio (utility function) of the estimated amount (traffic amount that can be sent) is defined. Then, the central control device performs control to maximize the total value of the utility functions.
  • the present invention provides a wireless communication system, a wireless communication method, a centralized control device, and a wireless communication method capable of centrally controlling the allocation of wireless resources so as to expand communication capacity for a system including a base station capable of multi-link transmission.
  • the purpose is to provide a control program.
  • a wireless communication system includes a base station capable of multi-link transmission with a wireless terminal, and includes a plurality of base stations capable of communicating with the wireless terminal for each wireless device accommodated, and the base station.
  • a wireless communication system comprising a central control device that centrally controls each station, the central control device transmits data to each of the base stations using a channel and bandwidth allocated to the wireless device accommodated in the base station.
  • a utility function calculation unit that calculates a ratio of the total amount of possible traffic to the amount of accommodated traffic at the base station as a utility function; and a summation unit that calculates for each base station the sum of the utility functions calculated by the utility function calculation unit.
  • a change control unit that performs control to change the channel and bandwidth of each of the wireless devices so that the summation unit maximizes the sum of the utility functions calculated for each base station.
  • the wireless communication method includes a base station that is capable of multi-link transmission with a wireless terminal, and each wireless device that accommodates a plurality of base stations that can communicate with the wireless terminal.
  • the centrally controlled wireless communication method for each of the base stations, the ratio of the total amount of traffic that can be transmitted based on channels and bandwidths allocated to the wireless devices accommodated in the base station to the amount of traffic accommodated in the base station.
  • the method is characterized in that it includes a change control step of controlling to change the channel and bandwidth of each device.
  • the centralized control device includes a base station capable of multi-link transmission with wireless terminals, and each wireless device accommodated has a plurality of base stations capable of communicating with the wireless terminal.
  • a centralized control device that performs centralized control, for each of the base stations, the ratio of the total amount of traffic that can be transmitted based on channels and bandwidths allocated to the wireless devices accommodated in the base station to the amount of traffic accommodated in the base station.
  • a utility function calculation unit that calculates the sum of the utility functions calculated by the utility function calculation unit for each of the base stations;
  • the present invention is characterized by comprising a change control unit that performs control to change the channel and bandwidth of each of the wireless devices so as to maximize the total.
  • wireless resource allocation can be centrally controlled to expand communication capacity for a system including base stations capable of multi-link transmission.
  • FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment.
  • FIG. 2 is a functional block diagram illustrating functions of the central control device.
  • FIG. 2 is a diagram schematically illustrating a utility function U calculated by the central control device for a plurality of base stations capable of multi-link transmission and a plurality of base stations that do not perform multi-link transmission.
  • 4 is a diagram schematically showing wireless devices of each base station shown in FIG. 3.
  • FIG. 1 is a flowchart illustrating an example of the operation of a wireless communication system according to an embodiment.
  • FIG. 2 is a diagram illustrating a hardware configuration of a central control device according to an embodiment.
  • 1 is a diagram illustrating a configuration example of a wireless communication system that does not include a multilink device.
  • FIG. 3 is a diagram showing a specific example of a RATOP algorithm executed by the central control device.
  • FIG. 7 is a diagram illustrating a configuration example of a wireless communication system 1 that does not include a multilink device.
  • the wireless communication system 1 is, for example, a wireless LAN system that does not include an AP MLD and a STA MLD, and the above-mentioned RATOP is applied.
  • the wireless communication system 1 includes, for example, a plurality of base stations 2, a central control device 3, and a plurality of wireless terminals 4 connected to a network 100.
  • Each base station 2 accommodates a plurality of wireless terminals 4 by being centrally controlled by a central control device 3 .
  • a base station may be referred to as an AP.
  • AP identifier b Bandwidth c: Channel (primary channel)
  • R Data rate (MCS)
  • the expected throughput of AP (a) depends on the channel usage status of other APs. Further, the accommodated traffic amount (depending on the amount of generated data) is, for example, the estimated maximum traffic value of AP (a) shown in the following equation (2).
  • the centralized control device 3 performs processing to maximize the sum ⁇ U of the utility functions U according to the following algorithm.
  • RATOP algorithm (A): The central control device 3 "tentatively allocates" the channel/bandwidth used by each AP according to predetermined rules. (B): The centralized control device 3 calculates the sum ⁇ U of the utility functions U of each AP in the above case (A). (C): The centralized control device 3 reallocates channels and bandwidths to APs with a low utility function U, and performs control so that ⁇ U does not decrease. Then, the centralized control device 3 repeats the step (C) within a range of predetermined conditions.
  • FIG. 8 is a diagram showing a specific example of the RATOP algorithm executed by the central control device 3. As shown in FIG. 8, the central control device 3 performs phase I (initial calculation) and phase II (optimization) processing.
  • the central control device 3 selects one AP as AP-a (S100), selects a bandwidth b that can be allocated to AP-a (S102), and selects a bandwidth b that can be allocated to AP-a.
  • Channel c is selected (S104), and utility function U of AP-a is calculated (S106).
  • the centralized control device 3 executes the process of S104 and the process of S106 for all channels c, and repeats the process for all bandwidths b.
  • the centralized control device 3 selects the combination (b, c) that maximizes the utility function U (S108), and repeats the process for all APs.
  • the centralized control device 3 selects, for example, an AP with a small utility function U, and then selects the combination (parameters) of (b, c) in which the utility function U becomes maximum and the sum ⁇ U of the utility functions U does not deteriorate. The process of selecting is repeated (S110).
  • the centralized control device 3 sets the combinations (b, c) selected by each AP as the allocated bandwidth and channel after control.
  • FIG. 1 is a diagram illustrating a configuration example of a wireless communication system 10 according to an embodiment.
  • the wireless communication system 10 is a wireless LAN system including an AP MLD and a STA MLD, and the above-mentioned RATOP is applied to the MLD.
  • the wireless communication system 10 includes, for example, base stations 20-1, 20-2, and 30 connected to a network 100, a central control device 40, and a plurality of wireless terminals 50 and 52. Note that when one of the plurality of configurations, such as base stations 20-1 and 20-2, is not specified, it is simply abbreviated as base station 20 or the like.
  • Each of the base stations 20-1, 20-2, and 30 accommodates a plurality of wireless terminals 50 and 52 by being centrally controlled by the central control device 40.
  • the base stations 20-1, 20-2, and 30 may be described as APs.
  • the wireless terminals 50 are STA and MLD, respectively.
  • the wireless terminals 52 are terminals that do not each have a multilink function.
  • the base stations 20-1 and 20-2 are each AP MLD, and have an MLD section 200 and wireless devices 202 and 204.
  • the MLD unit 200 transmits and receives signals to and from the central control device 40 and the wireless devices 202 and 204, and performs processing for the base station 20 to function as an AP MLD using the wireless devices 202 and 204.
  • the wireless device 202 has a function as a base station (AP) that performs wireless communication using, for example, a 5 GHz band.
  • the wireless device 204 has a function as a base station (AP) that performs wireless communication using, for example, a 6 GHz band.
  • the base station 30 has one wireless device 300 and does not have a multilink function.
  • the wireless device 300 has a function as a base station (AP) that performs wireless communication using, for example, a 5 GHz band.
  • AP base station
  • the centralized control device 40 centrally controls the base stations 20-1, 20-2, and 30 by, for example, wireless communication.
  • FIG. 2 is a functional block diagram illustrating the functions of the central control device 40.
  • the centralized control device 40 includes, for example, a wireless communication section 41, a collection section 42, a utility function calculation section 43, a summation section 44, a change control section 45, a distribution control section 46, and a main control section 47. .
  • the wireless communication unit 41 transmits and receives signals to and from the base stations 20-1, 20-2, and 30 by wireless communication, respectively.
  • the collection unit 42 collects information regarding the base stations 20-1, 20-2, and 30 via the wireless communication unit 41, and outputs the information to the utility function calculation unit 43. For example, the collection unit 42 collects information (traffic information, etc.) regarding each of the wireless devices 202, 204, and 300.
  • the utility function calculation unit 43 calculates the amount of traffic that can be transmitted (MLD base station In this case, the ratio of the total transmittable traffic of each subordinate device to the accommodated traffic amount at the base station (base station 20 or base station 30) is calculated as a utility function, and the calculated utility function is output to the summing unit 44. do.
  • the summation unit 44 calculates the sum of the utility functions calculated by the utility function calculation unit 43 and outputs the sum to the change control unit 45.
  • the change control unit 45 performs control to change the channels and bandwidths of each of the wireless devices 202, 204, and 300 so as to maximize the sum of the utility functions calculated by the summing unit 44.
  • the distribution control unit 46 After the change control unit 45 performs control to change the channel and bandwidth of each of the wireless devices 202 and 204, the distribution control unit 46 performs control based on either the amount of traffic that can be transmitted or the bandwidth of each of the wireless devices 202 and 204. and controls the distribution of traffic within the base station to each of the wireless devices 202 and 204. In addition, in order to maximize traffic, the distribution control unit 46 distributes traffic within the base station in proportion to the estimated amount of traffic that can be transmitted or the bandwidth of each of the wireless devices 202 and 204 so as to equalize the degree of congestion. Traffic distribution may also be controlled.
  • the main control section 47 controls each section constituting the central control device 40.
  • the centralized control device 40 calculates a utility function, which is an evaluation index for controlling radio resources, for each base station (base station 20 or base station 30), and calculates the utility function for each base station (base station 20 or base station 30). control the parameters of
  • the centralized control device 40 when applying the above-described RATOP, the centralized control device 40 first selects one AP MLD from among a plurality of AP MLDs.
  • the centralized control device 40 selects the bandwidth b and channel c for each wireless device of the AP MLD.
  • the centralized control device 40 calculates the utility function U for each AP MLD, and selects the combination of bandwidth b and channel c for each wireless device that maximizes the utility function U for each AP MLD.
  • FIG. 3 is a diagram schematically illustrating a utility function U calculated by the central control device 40 for a plurality of base stations capable of multi-link transmission (AP MLD) and a plurality of base stations that do not perform multi-link transmission. be.
  • FIG. 4 is a diagram schematically showing wireless devices of each base station shown in FIG. 3.
  • base stations 20-1 and 20-2 a plurality of base stations capable of multi-link transmission (AP MLD) are referred to as base stations 20-1 and 20-2, and a plurality of base stations that do not perform multi-link transmission (single base station) are referred to as base stations 30-1 and 20-2.
  • the score shall be 30-2.
  • base stations 20-1 and 20-2 each include wireless devices 202 and 204. It is also assumed that the base stations 30-1 and 30-2 are equipped with either a wireless device that uses a 5 GHz band or a 6 GHz band.
  • Ai indicates the amount of accommodated traffic
  • Bi indicates the amount of traffic that can be transmitted (in the case of MLD, the total amount of traffic that can be transmitted from each wireless device in the base station) (i is a variable).
  • the utility function Ui Bi/Ai.
  • B2 B2a+B2b.
  • B2a and B2b are each the amount of traffic that can be transmitted by the wireless device within the base station.
  • the central control device 40 instructs each MLD base station to allocate traffic to each wireless device under its control. At this time, the central control device 40 determines the traffic distribution ratio in proportion to the estimated amount of traffic that can be sent or the bandwidth, in order to maximize throughput.
  • FIG. 5 is a flowchart illustrating an example of the operation of the wireless communication system 10 according to an embodiment.
  • each of the base stations 20-1, 20-2, and 30 determines whether or not there is an instruction to collect information from the central control device 40 (S200), and if there is an instruction (S200: Yes), the base stations 20-1, 20-2, and 30 If there is no instruction (S200: No), the process of S200 is repeated.
  • step 202 the base stations 20-1, 20-2, and 30 transmit the traffic status and the like of the wireless devices 202, 204, and 300 that they accommodate to the central control device 40.
  • step 204 the base stations 20-1, 20-2, and 30 issue a control instruction (or It is determined whether there is a control instruction (to update the traffic distribution) from the central control device 40.
  • the base stations 20-1, 20-2, and 30 determine that there is a control instruction (S204: Yes)
  • the process proceeds to S206, and when it is determined that there is no control instruction (S204: No), the process proceeds to S200. Return to processing.
  • step 206 the base stations 20-1, 20-2, and 30 perform change control to change the bandwidth b and channel c (parameters) (or control to update the traffic allocation).
  • the wireless communication system 10 performs wireless resource allocation control based on the utility function of each base station (base station 20 or base station 30).
  • the wireless communication system 10 changes the channel and bandwidth of each of the wireless devices 202, 204, and 300 based on the utility function U for each base station (base station 20 or base station 30). Since the control is performed, radio resource allocation can be centrally controlled to expand communication capacity for a system including base stations capable of multi-link transmission.
  • each function of the central control device 40 may be partially or entirely configured by hardware such as a PLD (Programmable Logic Device) or FPGA (Field Programmable Gate Array), or may be executed by a processor such as a CPU. It may also be configured as a program.
  • hardware such as a PLD (Programmable Logic Device) or FPGA (Field Programmable Gate Array)
  • PLD Processable Logic Device
  • FPGA Field Programmable Gate Array
  • the central control device 40 can be realized using a computer and a program, and the program can be recorded on a storage medium or provided through a network.
  • FIG. 6 is a diagram illustrating the hardware configuration of the central control device 40 according to one embodiment.
  • the centralized control device 40 has an input section 400, an output section 410, a communication section 420, a CPU 430, a memory 440, and an HDD 450 connected to each other via a bus 460, and has a function as a computer.
  • the central control device 40 is also capable of inputting and outputting data to and from a computer-readable storage medium 470.
  • the input unit 400 is, for example, a keyboard and a mouse.
  • the output unit 410 is, for example, a display device such as a display.
  • the communication unit 420 is a communication interface that performs wireless communication using, for example, a wireless LAN.
  • the CPU 430 controls each part of the central control device 40 and performs predetermined processing.
  • the memory 440 and HDD 450 store data and the like.
  • the storage medium 470 is capable of storing programs and the like that execute the functions of the central control device 40. Note that the architecture configuring the centralized control device 40 is not limited to the example shown in FIG.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Un système de radiocommunication selon un mode de réalisation comprend un dispositif de commande centralisée qui réalise une commande centralisée de multiples stations de base incluant des stations de base capables de réaliser des transmissions à multiples liaisons conjointement avec des terminaux radioélectriques. Le système de radiocommunication est caractérisé en ce que le dispositif de commande centralisée comprend : une unité de calcul de fonction d'utilité qui, pour chacune des stations de base, calcule, en tant que fonction d'utilité, un rapport de la somme totale de quantités de trafic de transmission possibles à l'aide de canaux et de largeurs de bande attribués à des dispositifs radioélectriques, reçues par la station de base sur une quantité de trafic reçue dans la station de base; une unité d'addition qui calcule la somme totale des fonctions d'utilité calculées par l'unité de calcul de fonction d'utilité pour les stations de base respectives; et une unité de commande de changement qui réalise une commande pour changer le canal et la largeur de bande de chacun des dispositifs radioélectriques de sorte que la somme totale des fonctions d'utilité calculées par l'unité d'addition pour les stations de base respective est maximisée.
PCT/JP2022/027294 2022-07-11 2022-07-11 Système de radiocommunication, procédé de radiocommunication, dispositif de commande centralisée et programme de commande centralisée WO2024013817A1 (fr)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021141553A (ja) * 2020-03-09 2021-09-16 キヤノン株式会社 通信装置、通信方法、およびプログラム

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021141553A (ja) * 2020-03-09 2021-09-16 キヤノン株式会社 通信装置、通信方法、およびプログラム

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ISHIHARA, KOICHI ET AL.: "Standardization and R&D Trend of High Efficiency Wireless LAN", IEICE COMMUNICATIONS SOCIETY MAGAZINE, vol. 51, 1 December 2019 (2019-12-01), pages 186 - 191 *

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