WO2023242918A1 - 無線通信システム、無線通信方法及び無線通信装置 - Google Patents

無線通信システム、無線通信方法及び無線通信装置 Download PDF

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Publication number
WO2023242918A1
WO2023242918A1 PCT/JP2022/023667 JP2022023667W WO2023242918A1 WO 2023242918 A1 WO2023242918 A1 WO 2023242918A1 JP 2022023667 W JP2022023667 W JP 2022023667W WO 2023242918 A1 WO2023242918 A1 WO 2023242918A1
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WO
WIPO (PCT)
Prior art keywords
sleep
wireless communication
links
function
mld
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/JP2022/023667
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English (en)
French (fr)
Japanese (ja)
Inventor
ヒランタ アベセカラ
花絵 大谷
朗 岸田
純一 岩谷
陸 大宮
信也 大槻
匡史 岩渕
裕介 淺井
泰司 鷹取
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NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
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Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP2024527920A priority Critical patent/JP7772213B2/ja
Priority to PCT/JP2022/023667 priority patent/WO2023242918A1/ja
Publication of WO2023242918A1 publication Critical patent/WO2023242918A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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

  • the present disclosure relates to a wireless communication system, a wireless communication method, and a wireless communication device.
  • IEEE 802.11be a wireless LAN communication standard, is equipped with a multi-link transmission function that allows multiple frequency bands to be used together. Multilink transmission allows different data to be transmitted simultaneously in multiple frequency bands, thereby achieving higher speeds. Furthermore, each link used in multilink transmission implements CSMA/CA.
  • IEEE 802.11be standardization document IEEE 802.11-20/1935r64, “Compendium of straw polls and potential changes to the Specification Framework Document”, “6 Multi-link operation” (https://mentor.ieee.org/802.11/dcn/ 20/11-20-1935-64-00be-compendium-of-straw-polls-and-potential-changes-to-the-specification-framework-document-part-2.docx)
  • the present disclosure causes some links in some APs (access points) to sleep for a certain period of time by network control when there is little data or when data quality requirements are met.
  • a first aspect of the present disclosure is a wireless communication system including a control engine and an MLD that has a plurality of APs and performs multilink transmission using a plurality of links, wherein the control engine provides information regarding control of the MLD.
  • a function to obtain MLD information a function to compare the delay time requirements of each AP and determine the delay conditions, a function to predict the total delay time for all combinations of links to sleep, and a function to predict the total delay time for all combinations of links to sleep.
  • the wireless communication system is provided with a function of transmitting sleep-related information, which is information related to sleep, to the MLD, and a function of the AP to perform wireless communication based on the sleep-related information.
  • a second aspect of the present disclosure is a wireless communication method performed by a wireless communication system including a control engine and an MLD that has a plurality of APs and performs multilink transmission using a plurality of links, the control engine comprising: A step of acquiring MLD information, which is information related to MLD control, a step of comparing the delay time requirements of each AP and determining a delay condition, and a step of predicting the total delay time for all combinations of links to be put to sleep.
  • the wireless communication method comprises a step of transmitting sleep-related information, which is information about the combination of links that have been set, to the MLD, and a step of the AP performing wireless communication based on the sleep-related information.
  • a third aspect of the present disclosure is a wireless communication device connected to an MLD that has multiple APs and performs multilink transmission using multiple links, and acquires MLD information that is information related to control of the MLD.
  • some links in some APs are kept constant by network control. Let it sleep for an hour. This makes it possible to reduce power consumption and improve transmission efficiency.
  • FIG. 1 is a diagram illustrating conventional multilink transmission
  • FIG. FIG. 2 is a diagram illustrating multilink transmission according to Embodiment 1 of the present disclosure.
  • 2 is a flowchart illustrating a process in which a control engine determines a delay condition according to Embodiment 1 of the present disclosure.
  • 3 is a flowchart illustrating a process in which the control engine predicts the total delay time during link sleep according to Embodiment 1 of the present disclosure. It is a flow which shows the process which determines the link in which a control engine sleeps based on Embodiment 1 of this indication.
  • FIG. 2 is a functional block diagram of a control engine according to Embodiment 1 of the present disclosure.
  • FIG. 1 is a diagram illustrating conventional multilink transmission.
  • the multilink 200 includes MLDs (Multi Link Devices) 2a, 2b, 2c, and 2d.
  • the MLDs 2a, 2b, 2c, and 2d each have a MAC (Multi Access Controller).
  • the MAC is a controller that performs communication control, and transmits information transmitted from a higher level to the AP.
  • the AP converts the transmitted information into packets and transmits them to the receiving device via the link.
  • FIG. 2 is a diagram showing multilink transmission according to Embodiment 1 of the present disclosure.
  • some links in some APs are put to sleep for a certain period of time by network control.
  • the multilink 100 includes MLDs 2a, 2b, 2c, and 2d.
  • MLDs 2a, 2b, 2c and 2d are connected to a control engine 50.
  • the control engine collects MLD information 52, which is information regarding control of the MLD, from the MLDs 2a, 2b, 2c, and 2d. Examples of the MLD information 52 include accommodated traffic information or link-by-link environment information.
  • the control engine 50 determines the link to be used by performing predetermined processing based on the MLD information 52. The details of the predetermined processing will be described later. Then, the control engine 50 transmits sleep-related information 54, which is information regarding the link to be used, to the MLDs 2a, 2b, 2c, and 2d. Then, the MLDs 2a, 2b, 2c, and 2d perform multilink transmission based on the sleep-related information 54.
  • FIG. 3 is a flowchart showing a process in which the control engine determines delay conditions according to Embodiment 1 of the present disclosure.
  • the delay time is determined from the delay time requirements unique to each AP.
  • step 100 the control engine checks the delay time requirements.
  • the multilink transmission to be controlled includes a plurality of MLDs each having a plurality of APs.
  • step 100 delay time requirements are checked for all accommodated APs.
  • step 102 the control engine determines delay conditions.
  • the strictest delay time requirement of all APs is selected as the delay condition. This determines the delay conditions for the target multilink transmission.
  • FIG. 4 is a flowchart showing a process in which the control engine predicts the total delay time during link sleep according to Embodiment 1 of the present disclosure.
  • the control engine estimates the total delay time d n that would occur if a particular link were put to sleep.
  • the total delay time d n is defined as the sum of the transmission time T n and the queuing time Q n .
  • the transmission time T n is the channel use time of the own station, and is determined from MCS (Modulation and Coding Scheme) or the like.
  • the queuing time Qn is the waiting time due to channel use by other stations, and is determined based on the degree of interference and the like.
  • this prediction is performed for all combinations of all links included in the target multilink.
  • One example of a method for predicting the total delay time d n is to add the transmission time T n of a link that has been put to sleep to the transmission time T n of a link that has not been put to sleep.
  • FIG. 5 is a flowchart showing a process for determining a link on which the control engine sleeps, according to Embodiment 1 of the present disclosure.
  • step 106 it is checked whether the expected delay time d n satisfies the delay condition. This investigation is performed on one combination of all links included in the target multilink. If the conditions are met, proceed to step 108. If the conditions are not met, proceed to step 110.
  • step 108 it is determined that the investigated combination of links is a combination that allows sleep, and is stored. Thereafter, the process returns to step 106 to investigate the next link combination.
  • step 110 the investigated combination of links is determined to be a combination in which sleep is not possible and is stored. Thereafter, the process returns to step 106 to investigate the next link combination.
  • step 112 the link combination with the largest number of links is selected from among the link combinations determined to be sleep-enabled combinations. Then, it is decided to put that combination of links to sleep.
  • the first method is to select based on the total delay time d n . For example, by selecting a combination of links with the shortest total delay time d n , it is possible to perform multilink transmission that is most excellent in terms of total delay time. Note that depending on other requirements, it is also possible to select a combination of links in which the length of the total delay time d n is in an arbitrary order.
  • the second method is to select based on transmission efficiency. For example, by selecting a combination of links with the best transmission efficiency, it is possible to perform multi-link transmission that is most excellent in terms of transmission efficiency. Note that depending on other requirements, it is also possible to select a combination of links that have an arbitrary ranking of transmission efficiency.
  • the third method is to select based on the number of links to be used. For example, by selecting a combination of links that uses the least number of links, it is possible to put the maximum number of terminals to sleep, and therefore it is possible to perform multi-link transmission that is most excellent in terms of power consumption. Note that depending on other requirements, it is also possible to select a combination of links in which the number of links used is in an arbitrary order.
  • the determined delay condition is 10 ms or less.
  • the link of AP2 is put to sleep.
  • the sleepable links are "Link 1 of AP1 & Link 2 of AP2", “Link 1 of AP1 & Link 3 of AP2", or "Link 2 of AP1 & Link 3 of AP2".
  • the predicted total delay time is compared with the delay conditions to determine whether the combination of links allows sleep.
  • it is determined that sleep is possible in three ways: "Link 1 of AP1 & Link 2 of AP2", “Link 1 of AP1 & Link 3 of AP2", or "Link 2 of AP1 & Link 3 of AP2". Therefore, a combination of links to be used is selected from these three ways and multi-link transmission is performed.
  • multilink transmission is performed using all links and traffic flows. That is, multilink transmission is performed by two APs each having three links.
  • two links are put to sleep to perform multilink transmission.
  • multi-link transmission can be performed with fewer transmitter/receiver circuits than in the conventional example. As a result, reduction in power consumption and improvement in transmission efficiency can be achieved.
  • FIG. 6 is a functional block diagram of the control engine according to Embodiment 1 of the present disclosure.
  • the control engine 50 includes a control target AP information collection function 56.
  • the controlled target AP information collection function 56 transmits the MLD information 52 transmitted from each MLD to the controlled target AP related various judgment functions 58.
  • the control target AP-related various determination functions 58 determine the link to sleep by performing the above-described predetermined processing. Information on the sleep link is then transmitted to the various settings implementation function 60 for the controlled AP.
  • the various settings implementation function 60 for the controlled AP transmits information on the sleep link to the communication function 62 with the controlled AP.
  • the communication function 62 with the controlled AP transmits the sleep-related information 54 to the MLD having the controlled AP.
  • the MLD that has received the sleep-related information 54 performs multilink transmission based on this.
  • Control engine 52 MLD information 54 Sleep related information 100 Multilink 200 Multilink

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/JP2022/023667 2022-06-13 2022-06-13 無線通信システム、無線通信方法及び無線通信装置 Ceased WO2023242918A1 (ja)

Priority Applications (2)

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JP2024527920A JP7772213B2 (ja) 2022-06-13 2022-06-13 無線通信システム、無線通信方法及び無線通信装置
PCT/JP2022/023667 WO2023242918A1 (ja) 2022-06-13 2022-06-13 無線通信システム、無線通信方法及び無線通信装置

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020250286A1 (ja) * 2019-06-10 2020-12-17 日本電信電話株式会社 無線通信システム、無線通信方法および無線局装置
WO2022024176A1 (ja) * 2020-07-27 2022-02-03 日本電信電話株式会社 基地局及び端末

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020250286A1 (ja) * 2019-06-10 2020-12-17 日本電信電話株式会社 無線通信システム、無線通信方法および無線局装置
WO2022024176A1 (ja) * 2020-07-27 2022-02-03 日本電信電話株式会社 基地局及び端末

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JAY YANG(NOKIA): "MLD AP Power-saving(PS) Considerations", IEEE 802.11-20/1115R6, 7 December 2020 (2020-12-07), pages 1 - 7, XP068175407 *

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