WO2022024172A1 - 基地局及び端末 - Google Patents

基地局及び端末 Download PDF

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Publication number
WO2022024172A1
WO2022024172A1 PCT/JP2020/028673 JP2020028673W WO2022024172A1 WO 2022024172 A1 WO2022024172 A1 WO 2022024172A1 JP 2020028673 W JP2020028673 W JP 2020028673W WO 2022024172 A1 WO2022024172 A1 WO 2022024172A1
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WO
WIPO (PCT)
Prior art keywords
link
terminal
data
base station
management unit
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/JP2020/028673
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English (en)
French (fr)
Japanese (ja)
Inventor
朗 岸田
健悟 永田
保彦 井上
裕介 淺井
泰司 鷹取
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 CN202080104623.7A priority Critical patent/CN116158152B/zh
Priority to JP2022539793A priority patent/JP7517426B2/ja
Priority to EP20947700.9A priority patent/EP4192153A4/en
Priority to PCT/JP2020/028673 priority patent/WO2022024172A1/ja
Priority to US18/017,932 priority patent/US12446089B2/en
Publication of WO2022024172A1 publication Critical patent/WO2022024172A1/ja
Anticipated expiration legal-status Critical
Priority to JP2024061707A priority patent/JP7768281B2/ja
Priority to JP2025179538A priority patent/JP2026010192A/ja
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • 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
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • 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
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof
    • H04W52/028—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof switching on or off only a part of the equipment circuit blocks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the embodiment relates to a base station and a terminal.
  • a wireless LAN Local Area Network
  • a wireless system that wirelessly connects a base station and a terminal.
  • IEEE Std 802.11-2016 “ Figure 4-25 Establishing the IEEE 802.11 association” and “11.3 STA authentication and association”, 7 December 2016
  • the challenge is to reduce the power consumption of wireless terminals.
  • the base station of the embodiment includes a first radio signal processing unit, a second radio signal processing unit, and a link management unit.
  • the first radio signal processing unit is configured to be capable of transmitting and receiving radio signals using the first channel.
  • the second radio signal processing unit is configured to be capable of transmitting and receiving radio signals using a second channel different from the first channel.
  • the link management unit establishes a multi-link with the terminal by using the first radio signal processing unit and the second radio signal processing unit, and uses the first radio signal processing unit as the main in the multi-link primary link. And set the second radio signal processing unit to the secondary link used as an auxiliary in the multi-link.
  • the link management unit sets the secondary link to the operation hibernation mode in which the power consumption is lower than that in the active mode.
  • the link management unit sets the secondary link to the active mode.
  • the base station of the embodiment can suppress the power consumption at the time of multi-link.
  • FIG. 1 is a conceptual diagram showing an example of the overall configuration of the wireless system according to the embodiment.
  • FIG. 2 is a conceptual diagram showing a specific example of the format of the wireless frame in the wireless system according to the embodiment.
  • FIG. 3 is a block diagram showing an example of the configuration of a base station included in the wireless system according to the embodiment.
  • FIG. 4 is a block diagram showing an example of the function of the base station included in the wireless system according to the embodiment.
  • FIG. 5 is a block diagram showing an example of the configuration of a terminal included in the wireless system according to the embodiment.
  • FIG. 6 is a block diagram showing an example of the function of the terminal included in the wireless system according to the embodiment.
  • FIG. 1 is a conceptual diagram showing an example of the overall configuration of the wireless system according to the embodiment.
  • FIG. 2 is a conceptual diagram showing a specific example of the format of the wireless frame in the wireless system according to the embodiment.
  • FIG. 3 is a block diagram showing an example of the configuration of a base station included
  • FIG. 7 is a block diagram showing an example of a detailed function of the link management unit of the base station included in the wireless system according to the embodiment.
  • FIG. 8 is a flowchart showing an example of multi-link processing in the wireless system according to the embodiment.
  • FIG. 9 is a table showing an example of link management information in the wireless system according to the embodiment.
  • FIG. 10 is a flowchart showing an example of a data transmission method at the time of multi-link in the wireless system according to the embodiment.
  • FIG. 11 is a flowchart showing a specific example of how to use the multi-link power save in the wireless system according to the embodiment.
  • FIG. 12 is a table showing an example of changes in link management information due to the usage example of the multi-link power save described with reference to FIG. FIG.
  • FIG. 13 is a flowchart showing an example of execution conditions of the link activation process in the wireless system according to the embodiment.
  • FIG. 14 is a flowchart showing an example of execution conditions of the link stop processing in the wireless system according to the embodiment.
  • FIG. 15 is a flowchart showing a specific example of the link start / stop process in the wireless system according to the embodiment.
  • FIG. 16 is a conceptual diagram showing a specific example of a wireless frame used in the link start / stop process of the wireless system according to the embodiment.
  • FIG. 17 is a conceptual diagram showing a specific example of a wireless frame used in the link start / stop process of the wireless system according to the embodiment.
  • FIG. 18 is a flowchart showing an example of execution conditions of the link activation process in the wireless system according to the first modification of the embodiment.
  • FIG. 19 is a flowchart showing an example of execution conditions of the link stop processing in the wireless system according to the first modification of the embodiment.
  • FIG. 20 is a flowchart showing an example of execution conditions of the link activation process in the wireless system according to the second modification of the embodiment.
  • FIG. 21 is a flowchart showing an example of execution conditions of the link stop processing in the wireless system according to the second modification of the embodiment.
  • FIG. 22 is a flowchart showing an example of execution conditions of the link activation process in the wireless system according to the third modification of the embodiment.
  • FIG. 23 is a flowchart showing an example of execution conditions of the link stop processing in the wireless system according to the third modification of the embodiment.
  • FIG. 24 is a flowchart showing a specific example of the link start / stop process in the wireless system according to the fourth modification of the embodiment.
  • FIG. 25 is a conceptual diagram showing a specific example of a wireless frame used in the link start / stop process of the wireless system according to the fourth modification of the embodiment.
  • FIG. 26 is a conceptual diagram showing an example of a frequency band used for wireless communication in the wireless system according to the fifth modification of the embodiment.
  • FIG. 27 is a table showing an example of link management information in the wireless system according to the fifth modification of the embodiment.
  • FIG. 28 is a table showing an example of data allocation in the multi-link of the wireless system according to the third modification of the embodiment.
  • FIG. 29 is a flowchart showing an example of execution conditions of the link stop processing in the wireless system according to the combination of the embodiment and the first modification of the embodiment.
  • the wireless system 1 according to the embodiment relates to a method of starting / stopping a link at the time of multi-linking.
  • the wireless system 1 according to the embodiment will be described below.
  • FIG. 1 shows an example of the configuration of the wireless system 1 according to the embodiment.
  • the wireless system 1 includes, for example, a base station 10, a terminal 20, and a server 30.
  • the base station 10 is connected to the network NW and is used as a wireless LAN access point.
  • the base station 10 can wirelessly distribute the data received from the network NW to the terminal 20.
  • the base station 10 may be connected to the terminal 20 by using one kind of band or a plurality of kinds of bands.
  • the wireless connection between the base station 10 and the terminal 20 using a plurality of types of bands is referred to as "multi-link".
  • the communication between the base station 10 and the terminal 20 is based on, for example, the 802.11 standard.
  • the terminal 20 is a wireless terminal such as a smartphone or a tablet PC.
  • the terminal 20 can send and receive data to and from the server 30 on the network NW via the base station 10 wirelessly connected.
  • the terminal 20 may be another electronic device such as a desktop computer or a laptop computer.
  • the terminal 20 may be any device that can communicate with at least the base station 10 and can execute the operation described later.
  • the server 30 can hold various information, for example, holds content data for the terminal 20.
  • the server 30 is connected to, for example, a network NW by wire, and is configured to be able to communicate with the base station 10 via the network NW.
  • the server 30 may be capable of communicating with at least the base station 10. That is, the communication between the base station 10 and the server 30 may be wired or wireless.
  • the data communication between the base station 10 and the terminal 20 is based on the OSI (Open Systems Interconnection) reference model.
  • OSI Open Systems Interconnection
  • the communication function has 7 layers (1st layer: physical layer, 2nd layer: data link layer, 3rd layer: network layer, 4th layer: transport layer, 5th layer: session layer, 6th layer. Layer: presentation layer, 7th layer: application layer).
  • the data link layer includes, for example, an LLC (Logical Link Control) layer and a MAC (Media Access Control) layer.
  • the LLC layer forms an LLC packet by adding a DSAP (Destination Service Access Point) header, a SSAP (Source Service Access Point) header, or the like to data input from, for example, a higher-level application.
  • the MAC layer adds a MAC header to, for example, an LLC packet to form a MAC frame.
  • FIG. 2 shows a specific example of the format of the wireless frame used for communication between the base station 10 and the terminal 20 in the wireless system 1 according to the embodiment.
  • the radio frame includes, for example, a Frame Control field, a Duration field, an Address1 field, an Address2 field, an Address3 field, a SequenceControl field, other control information fields, a Frame Body field, and an FCS (Frame Check Sequence) field. Includes.
  • the Frame Control field to other control information fields correspond to, for example, the MAC header included in the MAC frame.
  • the FrameBody field corresponds to, for example, the MAC payload contained in the MAC frame.
  • the FCS field stores an error detection code between the MAC header and the Frame Body field, and is used to determine the presence or absence of an error in the radio frame.
  • the Frame Control field indicates various control information, and includes, for example, a Type value, a Subtype value, a ToDS (ToDistributionSystem) value, and a FromDS value.
  • the Type value indicates the frame type of the radio frame. For example, the Type value “00” indicates that the radio frame is a management frame. The Type value “01” indicates that the radio frame is a control frame. The Type value "10" indicates that the radio frame is a data frame.
  • the content of the wireless frame changes depending on the combination of Type value and Subtype value. For example, "00/1000 (Type value / Subtype value)” indicates that the radio frame is a beacon signal.
  • the meanings of the To DS value and From DS value differ depending on the combination. For example, “00 (To DS / From DS)” indicates that the data is between terminals in the same IBSS (Independent Basic Service Set). “10” indicates that the data frame is directed to the DS (Distribution System) from the outside. “01” indicates that the data frame goes out of the DS. “11” is used when configuring a mesh network.
  • the Duration field indicates the planned period for using the wireless line.
  • the plurality of Address fields indicate a BSSID, a source address, a destination address, a sender terminal address, a receiver terminal address, and the like.
  • the SequenceControl field shows the sequence number of the MAC frame and the fragment number for the fragment.
  • Other control information fields include, for example, traffic type (TID) information.
  • TID information may be inserted at other locations within the radio frame.
  • the Frame Body field contains information according to the type of frame. For example, the FrameBody field stores data when it corresponds to a data frame.
  • FIG. 3 shows an example of the configuration of the base station 10 included in the wireless system 1 according to the embodiment.
  • the base station 10 includes, for example, a CPU (Central Processing Unit) 11, a ROM (Read Only Memory) 12, a RAM (Random Access Memory) 13, a wireless communication module 14, and a wired communication module 15.
  • a CPU Central Processing Unit
  • ROM Read Only Memory
  • RAM Random Access Memory
  • the CPU 11 is a circuit capable of executing various programs, and controls the overall operation of the base station 10.
  • the ROM 12 is a non-volatile semiconductor memory, and holds a program, control data, and the like for controlling the base station 10.
  • the RAM 13 is, for example, a volatile semiconductor memory and is used as a working area of the CPU 11.
  • the wireless communication module 14 is a circuit used for transmitting and receiving data by a wireless signal, and is connected to an antenna. Further, the wireless communication module 14 includes, for example, a plurality of communication modules corresponding to a plurality of frequency bands.
  • the wired communication module 15 is a circuit used for transmitting and receiving data by a wired signal, and is connected to a network NW.
  • FIG. 4 shows an example of the functional configuration of the base station 10 included in the wireless system 1 according to the embodiment.
  • the base station 10 includes, for example, a data processing unit 110, a link management unit 120, and radio signal processing units 130, 140, and 150.
  • the processing of the data processing unit 110, the link management unit 120, and the wireless signal processing units 130, 140, and 150 is realized by, for example, the CPU 11 and the wireless communication module 14.
  • the data processing unit 110 can execute the processing of the LLC layer and the processing of the upper layer (third layer to the seventh layer) with respect to the input data. For example, the data processing unit 110 outputs the data input from the server 30 via the network NW to the link management unit 120. Further, the data processing unit 110 transmits the data input from the link management unit 120 to the server 30 via the network NW.
  • the link management unit 120 executes, for example, a part of the processing of the MAC layer for the input data. Further, the link management unit 120 manages the link with the terminal 20 based on the notifications from the radio signal processing units 130, 140 and 150.
  • the link management unit 120 includes the link management information 121.
  • the link management information 121 includes, for example, information of a terminal 20 stored in a RAM 13 and wirelessly connected to the base station 10.
  • the link management unit 120 includes an association processing unit 122 and an authentication processing unit 123.
  • the association processing unit 122 executes the protocol related to the association when the connection request of the terminal 20 is received via any of the radio signal processing units 130, 140, and 150.
  • the authentication processing unit 123 executes a protocol related to authentication following the connection request.
  • Each of the wireless signal processing units 130, 140 and 150 transmits and receives data between the base station 10 and the terminal 20 using wireless communication. For example, each of the wireless signal processing units 130, 140, and 150 creates a wireless frame by adding a preamble, a PHY header, or the like to the data input from the link management unit 120. Then, each of the radio signal processing units 130, 140, and 150 converts the radio frame into a radio signal and distributes the radio signal via the antenna of the base station 10. Further, each of the radio signal processing units 130, 140, and 150 converts the radio signal received via the antenna of the base station 10 into a radio frame. Then, each of the radio signal processing units 130, 140, and 150 outputs the data contained in the radio frame to the link management unit 120.
  • each of the radio signal processing units 130, 140, and 150 can execute, for example, a part of the processing of the MAC layer and the processing of the first layer on the input data or the radio signal.
  • the radio signal processing unit 130 handles a radio signal in the 2.4 GHz band.
  • the radio signal processing unit 140 handles radio signals in the 5 GHz band.
  • the radio signal processing unit 150 handles a radio signal in the 6 GHz band.
  • the radio signal processing units 130, 140 and 150 may or may not share the antenna of the base station 10.
  • FIG. 5 shows an example of the configuration of the terminal 20 included in the wireless system 1 according to the embodiment.
  • the terminal 20 includes, for example, a CPU 21, a ROM 22, a RAM 23, a wireless communication module 24, a display 25, and a storage 26.
  • the CPU 21 is a circuit capable of executing various programs, and controls the overall operation of the terminal 20.
  • the ROM 22 is a non-volatile semiconductor memory, and holds a program, control data, and the like for controlling the terminal 20.
  • the RAM 23 is, for example, a volatile semiconductor memory and is used as a working area of the CPU 21.
  • the wireless communication module 24 is a circuit used for transmitting and receiving data by a wireless signal, and is connected to an antenna. Further, the wireless communication module 24 includes, for example, a plurality of communication modules corresponding to a plurality of frequency bands.
  • the display 25 displays, for example, a GUI (Graphical User Interface) corresponding to the application software.
  • the display 25 may have a function as an input interface of the terminal 20.
  • the storage 26 is a non-volatile storage device, and holds, for example, the system software of the terminal 20.
  • the terminal 20 does not have to be provided with a display. For example, in an IoT terminal, the display 25 may be
  • FIG. 6 shows an example of the functional configuration of the terminal 20 included in the wireless system 1 according to the embodiment.
  • the terminal 20 includes, for example, a data processing unit 210, a link management unit 220, a radio signal processing unit 230, 240 and 250, and an application execution unit 260.
  • the processing of the data processing unit 210, the link management unit 220, and the wireless signal processing units 230, 240, and 250 is realized by, for example, the CPU 21 and the wireless communication module 24.
  • the data processing unit 210 can execute the processing of the LLC layer and the processing of the upper layer (third layer to the seventh layer) with respect to the input data. For example, the data processing unit 210 outputs the data input from the application execution unit 260 to the link management unit 220. Further, the data processing unit 210 outputs the data input from the link management unit 220 to the application execution unit 260.
  • the link management unit 220 executes, for example, a part of the processing of the MAC layer for the input data. Further, the link management unit 220 manages the link with the base station 10 based on the notifications from the radio signal processing units 230, 240 and 250.
  • the link management unit 220 includes the link management information 221.
  • the link management information 221 contains, for example, information about a base station 10 stored in a RAM 23 and wirelessly connected to the terminal 20.
  • the link management unit 220 includes an association processing unit 222 and an authentication processing unit 223.
  • the association processing unit 222 executes the protocol related to the association when the connection request of the base station 10 is received via any of the radio signal processing units 230, 240, and 250.
  • the authentication processing unit 223 executes a protocol related to authentication following the connection request.
  • Each of the wireless signal processing units 230, 240, and 250 transmits and receives data between the base station 10 and the terminal 20 using wireless communication.
  • each of the wireless signal processing units 230, 240, and 250 creates a wireless frame by adding a preamble, a PHY header, or the like to the data input from the link management unit 220.
  • each of the radio signal processing units 230, 240, and 250 converts the radio frame into a radio signal and distributes the radio signal via the antenna of the terminal 20.
  • each of the wireless signal processing units 230, 240, and 250 converts the wireless signal received via the antenna of the terminal 20 into a wireless frame.
  • each of the radio signal processing units 230, 240, and 250 outputs the data contained in the radio frame to the link management unit 220.
  • each of the radio signal processing units 230, 240, and 250 can execute, for example, a part of the processing of the MAC layer and the processing of the first layer on the input data or the radio signal.
  • the radio signal processing unit 230 handles a radio signal in the 2.4 GHz band.
  • the radio signal processing unit 240 handles radio signals in the 5 GHz band.
  • the radio signal processing unit 250 handles a radio signal in the 6 GHz band.
  • the wireless signal processing units 230, 240 and 250 may or may not share the antenna of the terminal 20.
  • the application execution unit 260 executes an application that can use the data input from the data processing unit 210. For example, the application execution unit 260 can display the information of the application on the display 25. Further, the application execution unit 260 may operate based on the operation of the input interface.
  • the wireless signal processing units 130, 140 and 150 of the base station 10 are configured to be connectable to the wireless signal processing units 230, 240 and 250 of the terminal 20, respectively. That is, the wireless signal processing units 130 and 230 can be wirelessly connected using the 2.4 GHz band.
  • the wireless signal processing units 140 and 240 may be wirelessly connected using the 5 GHz band.
  • the wireless signal processing units 150 and 250 may be wirelessly connected using the 6 GHz band.
  • each radio signal processing unit may be referred to as a “STA function”. That is, the wireless system 1 according to the embodiment has a plurality of STA functions.
  • FIG. 7 shows the details of the channel access function in the link management unit 120 of the base station 10 included in the wireless system 1 according to the embodiment. Since the function of the link management unit 220 of the terminal 20 is the same as that of the link management unit 120 of the base station 10, for example, the description thereof will be omitted.
  • the link management unit 120 includes, for example, a data categorization unit 124, transmission queues 125A, 125B, 125C, 125D and 125E, and a CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) execution unit 126A, 126B, 126C. , 126D and 126E, and a data collision management unit 127.
  • a data categorization unit 124 transmission queues 125A, 125B, 125C, 125D and 125E
  • CSMA / CA Carrier Sense Multiple Access with Collision Avoidance
  • the data categorization unit 124 categorizes the data input from the data processing unit 110.
  • As the data category for example, "LL (Low Latency)”, “VO (Voice)”, “VI (Video)”, “BE (Best Effort)”, and “BK (Background)” are set. LL is applied to data that requires low delay. Therefore, it is preferable that the LL data is processed in preference to any of the VO, VI, BE and BK data.
  • the data categorization unit 124 inputs the categorized data to any of the transmission queues 125A, 125B, 125C, 125D and 125E.
  • the LL data is input to the transmission queue 125A.
  • the VO data is input to the transmission queue 125B.
  • the VI data is input to the transmission queue 125C.
  • BE data is input to the transmission queue 125D.
  • the BK data is input to the transmission queue 125E.
  • the input data of each category is accumulated in any of the corresponding transmission queues 125A to E.
  • Each of the CSMA / CA execution units 126A, 126B, 126C, 126D and 126E uses preset access parameters while confirming that the carrier sense does not transmit radio signals from other terminals or the like in the CSMA / CA. Wait for transmission for the specified time. Then, the CSMA / CA execution units 126A, 126B, 126C, 126D and 126E take out data from the transmission queues 125A, 125B, 125C, 125D and 125E, respectively, and process the taken out data via the data collision management unit 127. Output to at least one of units 130, 140 and 150. Then, the radio signal including the data is transmitted by the radio signal processing unit (STA function) whose transmission right has been acquired by CSMA / CA.
  • STA function radio signal processing unit
  • the CSMA / CA execution unit 126A executes CSMA / CA for the LL data held in the transmission queue 125A.
  • the CSMA / CA execution unit 126B executes CSMA / CA for the VO data held in the transmission queue 125B.
  • the CSMA / CA execution unit 126C executes CSMA / CA for the VI data held in the transmission queue 125C.
  • the CSMA / CA execution unit 126D executes CSMA / CA for the BE data held in the transmission queue 125D.
  • the CSMA / CA execution unit 126E executes CSMA / CA for the BK data held in the transmission queue 125E.
  • Access parameters are assigned so that the transmission of radio signals is prioritized in the order of, for example, LL, VO, VI, BE, and BK.
  • Access parameters include, for example, CWmin, CWmax, AIFS, TXOPLimit.
  • CWmin and CWmax indicate the minimum value and the maximum value of the contention window CW (ContentionWindow), which is the transmission waiting time for collision avoidance, respectively.
  • AIFS Aribitration InterFrame Space
  • TXOPLimit indicates an upper limit value of TXOP (Transmission Opportunity) corresponding to the occupation time of the channel.
  • the priority of the transmission queue 125 becomes higher as the AIFS is smaller.
  • the amount of data transmitted with one transmission right increases as the value of TXOP Limit increases.
  • the data collision management unit 127 prevents data collisions when a plurality of CSMA / CA execution units 126 acquire transmission rights with the same STA function. Specifically, the data collision management unit 127 adjusts the transmission timing of the data in which the transmission right is acquired by the same STA function in different categories, and transmits the data in the high priority category to the STA function.
  • the STA function acquired by the CSMA / CA of the transmission queue 125A of the LL may be the same as the STA function acquired the transmission right by the CSMA / CA of any of the other transmission queues 125B to 125E. ..
  • the data collision management unit 127 gives priority to the data stored in the transmission queue 125A and transmits the data to the STA function.
  • the data is transmitted in the order based on the priority set in the category. This prevents collisions between data to which transmission is assigned to the same STA function.
  • each STA function may implement the channel access function.
  • each STA function detects the state (idle / busy) of the radio channel in the corresponding link, and the link management unit determines whether or not data can be transmitted (which link). Send using, etc.).
  • each STA function may independently execute carrier sense and transmit data.
  • the channel access when a plurality of links are used at the same time may be executed by standardizing the access parameters by exchanging between the plurality of STA functions, and the access parameters are standardized by the link management unit. It may be executed by.
  • the base station 10 and the terminal 20 can use a plurality of links at the same time by transmitting data among the plurality of STA functions based on common access parameters.
  • STA1 and STA2 of the base station 10 are also referred to as "access point AP".
  • the transmission of the radio signal to the access point AP by the STA1 and STA2 of the terminal 20 corresponds to the transmission of the radio signal to the STA1 and STA2 of the base station 10, respectively.
  • STA1 and STA2 are described independently, they indicate the STA function of the terminal 20.
  • FIG. 8 is a flowchart showing an example of the multi-link processing in the wireless system 1 according to the embodiment. As shown in FIG. 8, in the multi-link process, for example, the processes of steps S10 to S16 are executed in order.
  • the terminal 20 transmits a probe request to the base station 10.
  • the probe request is a signal for confirming whether or not the base station 10 exists in the vicinity of the terminal 20.
  • the Frame Control field of the probe request contains, for example, "00/0100 (Type value / Subtype value)".
  • the base station 10 executes the process of step S11.
  • the base station 10 transmits a probe response to the terminal 20.
  • the probe response is a signal used by the base station 10 to respond to a probe request from the terminal 20.
  • the Frame Control field of the probe response contains, for example, "00/0101 (Type value / Subtype value)".
  • the terminal 20 executes the process of step S12.
  • the terminal 20 transmits a multi-link association request to the base station 10 via at least one STA function.
  • the multi-link association request is a signal for requesting the base station 10 to establish a multi-link.
  • the multi-link association request is generated by the link management unit 220 of the terminal 20.
  • the Frame Control field of the multi-link association request contains, for example, "00 / xxxx (Type value / Subtype value (xxxx is a predetermined numerical value))".
  • the link management unit 120 of the base station 10 executes the process of step S13.
  • the link management unit 120 of the base station 10 executes the multi-link association process using one STA function. Specifically, first, the base station 10 executes the association processing of the first STA function with the terminal 20. Then, when the wireless connection (link) is established in the first STA function, the link management unit 120 of the base station 10 uses the first STA function in which the link is established to use the second STA function. Executes the association processing of the STA function. That is, the STA function with an established link is used for the association processing of the STA function with no established link. When the association processing of at least two STA functions is completed, the base station 10 establishes the multi-link and executes the processing of step S14.
  • the multi-link may be established when the link is established in the first STA function.
  • each of the base station 10 and the terminal 20 notifies the capability of the multi-link, the link to be the multi-link, and the operation parameter in each link prior to the association processing, thereby performing the multi-link.
  • Associations can be executed in a batch.
  • the link management units 120 and 220 instruct the establishment of the multi-link when the first STA function starts the association, and specify the link or the like to be the target of the multi-link. Then, the link management units 120 and 220 execute the association of each link and manage these links as a multi-link.
  • step S14 the link management unit 120 of the base station 10 updates the link management information 121.
  • the process of step S14 is executed after the two links are established, but the link management information 121 may be updated every time the link state is updated, or the multi-link is established. It may be updated at the time.
  • the base station 10 executes the process of step S15.
  • the base station 10 transmits a multi-link establishment response to the terminal 20.
  • the multi-link establishment response is a signal used by the base station 10 to respond to a multi-link request from the terminal 20.
  • the Frame Control field of the multi-link association request contains, for example, "00/0001 (Type value / Subtype value)".
  • the link management unit 220 of the terminal 20 recognizes that the multi-link with the base station 10 has been established based on the reception of the multi-link establishment response.
  • the terminal 20 executes the process of step S16.
  • step S16 the link management unit 220 of the terminal 20 updates the link management information 221. That is, the terminal 20 records in the link management information 221 that the multi-link with the base station 10 has been established. As a result, the multi-link processing in the wireless system 1 according to the embodiment is completed, and data communication using the multi-link becomes possible between the base station 10 and the terminal 20.
  • FIG. 9 shows an example of the link management information 121 in the wireless system 1 according to the embodiment. Since the link management information 221 of the terminal 20 has information similar to the link management information 121 of the base station 10, the description thereof will be omitted. As shown in FIG. 9, the link management information 121 includes, for example, STA function, frequency band, link destination ID, presence / absence of multilink, and TID.
  • STA1 corresponds to the STA function using the frequency band of 6 GHz, that is, the radio signal processing unit 150 or 250.
  • STA2 corresponds to the STA function using the frequency band of 5 GHz, that is, the radio signal processing unit 140 or 240.
  • STA3 corresponds to the STA function using the frequency band of 2.4 GHz, that is, the radio signal processing unit 130 or 230.
  • the link destination ID corresponds to the identifier of the terminal 20 in the link management information 121, and corresponds to the identifier of the base station 10 in the link management information 221.
  • a multi-link using STA1 and STA2 has been established.
  • each of the link management units 120 and 220 transmits the data input from the upper layer using the link of at least one STA function associated with the multi-link.
  • STA1 is set as the primary link and STA2 is set as the secondary link.
  • the primary link is a link used as the main link in the multi-link.
  • Secondary links are links that are used auxiliary in multilinks.
  • the links that make up the multilink are assigned to either the primary link or the secondary link.
  • the link sets constituting each multi-link may be different from each other, and the primary link may also be different from each other.
  • the optimal link between the base station 10 and each terminal 20 can be set as the primary link. This is expected to have the effect of improving the quality of wireless communication.
  • the primary link is used for sending and receiving control information related to the operation of the multi-link.
  • the primary link is preset, for example, when establishing a multilink between the base station 10 and the terminal 20.
  • the STA function used as the primary link may be set in priority according to the frequency band or may be set according to the radio field strength of the link.
  • TID in the link management information 121 indicates the association between the STA function and the TID information.
  • Each STA function sends and receives data corresponding to the assigned TID information.
  • TIDs # 1 to 3 corresponds to any one of LL, VO, VI, BE, and BK.
  • One STA function may be associated with one traffic, that is, one TID information, or a plurality of STA functions may be associated with each other.
  • TID # 1 is assigned to both STA1 and STA2.
  • TID # 2 is assigned to STA1.
  • TID # 3 is assigned to STA2.
  • the traffic flow corresponding to the association between the traffic and the STA function is preset at the time of setting up the multi-link between the base station 10 and the terminal 20.
  • the link management unit 220 of the terminal 20 determines the correspondence between the traffic and the STA function, and requests the link management unit 120 of the base station 10. Then, when the base station 10 responds to the request, the association between the traffic and the STA function is confirmed.
  • the traffic is set to be even among a plurality of links constituting the multi-link, for example.
  • similar types of traffic may be collected in one of the links constituting the multilink.
  • audio is associated with a frequency band of 2.4 GHz
  • video is associated with 5 G.
  • the frequency used for transmission / reception is assigned according to the type of information to be handled and the amount of data.
  • FIG. 10 shows an example of a method of transmitting data at the time of multi-link in the base station 10 provided in the wireless system 1 according to the embodiment. As shown in FIG. 10, when the base station 10 acquires data from the upper layer, the base station 10 sequentially executes the processes of steps S20 to S22.
  • the link management unit 120 acquires the TID information corresponding to the data.
  • the link management unit 120 associates the hand data with the TID based on the information contained in the header of the data acquired from the upper layer, for example.
  • the link management unit 120 confirms which TID the traffic flow of the data corresponds to.
  • the link management unit 120 acquires the STA function corresponding to the associated TID information. At this time, the link management unit 120 confirms the association between the TID information and the STA function by referring to the link management information 121.
  • the number of STA functions acquired by the link management unit 120 may be one or a plurality.
  • the link management unit 120 outputs data to the acquired STA function.
  • one STA function is associated with the output data (traffic)
  • the data is transmitted serially using one STA function.
  • the data is transmitted in parallel using the plurality of STA functions.
  • data distribution and sorting are executed between the link management unit 120 of the base station 10 and the link management unit 220 of the terminal 20.
  • the data distribution is executed by the link management unit on the transmitting side
  • the sorting of the data is executed by the link management unit on the receiving side.
  • the link management unit on the transmitting side adds a flag indicating that the radio frame is multi-link and an identification number to the wireless frame.
  • the link management unit on the receiving side executes data sorting based on the added flag and the identification number.
  • the link management unit may execute aggregation by combining the received plurality of data. Aggregation in multilink may be used as an optional feature that can be selected by the user.
  • a plurality of types of operation modes are prepared for each STA function.
  • Examples of the operation mode of the STA function include an active mode, an intermittent operation mode, and an operation pause mode.
  • the active mode corresponds to a state in which the STA function of the terminal 20 maintains the Awake state so that wireless signals can be transmitted and received at any time.
  • the intermittent operation mode corresponds to a state in which the STA function of the terminal 20 repeats the Awake state and the Doze state to operate intermittently.
  • the operation hibernation mode corresponds to a state in which transmission / reception of wireless signals is impossible by maintaining the Doze state of the STA function of the terminal 20.
  • the plurality of STA functions constituting the multi-link include at least one active mode or intermittent operation mode link. The other links that make up the multilink may be set to either active mode, intermittent operation mode, or hibernation mode.
  • the Awake state corresponds to the state in which wireless signals can be transmitted and received.
  • the Dose state corresponds to the state in which wireless signals cannot be transmitted or received.
  • the supply of power to the circuit related to the STA function is appropriately cut off. Therefore, the power consumption of the STA function decreases in the order of active mode, intermittent operation mode, and operation pause mode.
  • the base station 10 or the terminal 20 can be used for communication, there may be a link between them that is not included in the multi-link link set (Disabled link).
  • a link in active mode or intermittent operation mode that is, a link that can communicate is referred to as an “STA function (link) in the Awake state”.
  • the link in the operation hibernation mode that is, the link in the power saving state in which communication is impossible, is called the "STA function (link) in the Dose state”.
  • the STA function set in the primary link is set to, for example, either an active mode or an intermittent operation mode.
  • the STA function set in the secondary link may be set to any of the active mode, the intermittent operation mode, and the operation pause mode.
  • the terminal 20 can operate in a power saving manner by setting the secondary link to the operation hibernation mode at the time of multilink.
  • the state of the multi-link in which the secondary link is set to the hibernation mode is referred to as "multi-link power save".
  • the initial state of the secondary link may be set to any of the active mode, the intermittent operation mode, and the operation pause mode.
  • FIG. 11 shows an example of how to use the multi-link power save in the wireless system 1 according to the embodiment.
  • the link state shown in FIG. 9 is set.
  • each of STA1 and STA2 is set to the active mode.
  • the data of TID # 2 and the data of TID # 3 can be transmitted and received together.
  • the link management unit 220 of the terminal 20 When the link management unit 220 of the terminal 20 detects that the first condition is satisfied, it transmits a Doze transition notification signal to the access point AP using the primary link (STA1) (step S30).
  • the first condition corresponds to, for example, that the traffic of the secondary link (STA2) is not accumulated.
  • the Doze transition notification signal is a signal for notifying the transition to the Doze state, and corresponds to the illustrated “disable”.
  • the terminal 20 can know the traffic information by receiving the beacon signal of the base station 10 using at least one of STA1 and STA2.
  • the link management unit 120 of the base station 10 confirms whether or not the transition to the operation hibernation mode of the secondary link can be permitted. Then, when the transition to the operation hibernation mode of the secondary link can be permitted, the link management unit 220 of the terminal 20 transmits an acknowledgment (“OK”) to the terminal 20 via STA1 or STA2 (step S31). The link management unit 120 of the base station 10 may transmit a negative response (“NO”) to the base station 10 via STA1 or STA2 when the transition to the operation hibernation mode of the secondary link cannot be permitted. good.
  • the link management unit 220 of the terminal 20 changes the STA2 set as the secondary link to the operation pause mode (Doze state) (step S32).
  • STA1 and STA2 of the terminal 20 are put into the Awake state and the Doze state, respectively.
  • the multi-link is in a state where only the data of TID # 2 can be transmitted / received.
  • the Awake transition request signal is transmitted to the access point AP using the primary link (STA1) (step S33).
  • the Awake transition request signal is a signal requesting the transition to the Awake state, and corresponds to the illustrated “enable”.
  • the second condition corresponds to, for example, the accumulation of traffic on the secondary link (STA2).
  • the terminal 20 can know the traffic information by receiving the beacon signal of the base station 10 using the STA1 in the active state.
  • the link management unit 120 of the base station 10 transmits an acknowledgment (“OK”) to the terminal 20 via the STA1 corresponding to the primary link (step S34). ..
  • the link management unit 220 of the terminal 20 changes the STA2 set as the secondary link to the active mode (step S35).
  • each of STA1 and STA2 of the terminal 20 is in the Awake state.
  • the multi-link is in a state where, for example, any data of TID # 1 to 3 can be transmitted / received.
  • FIG. 12 shows an example of changes in the link management information 121 due to the usage example of the multi-link power save described with reference to FIG.
  • the on / off of the multi-link power save is applied by the Doze transition notification signal and the Awake transition request signal, respectively.
  • the terminal 20 transmits a Doze transition notification signal to the base station 10, so that the secondary link in the active mode shifts to the hibernation mode and transmits an Awake transition request signal.
  • the secondary link in hibernation mode shifts to active mode.
  • the base station 10 and the terminal 20 can change the operation mode of the secondary link by transmitting the Awake transition request signal / Doze transition notification signal.
  • the transmission of the Awake transition request signal is performed using the primary link or other activated link.
  • the transmission of the Doze transition notification signal is executed using the primary link or the link to stop (the link to shift to the hibernation mode).
  • the Awake transition request signal and the Doze transition notification signal may be transmitted from either the access point AP or the terminal 20.
  • the change of the operation mode is executed, for example, triggered by the traffic accumulated in the buffer exceeding a predetermined threshold value.
  • the intermittent operation mode may be applied to the primary link.
  • the primary link operates so that it can receive a beacon signal including at least multi-link control information.
  • Link start / stop process The wireless system 1 according to the embodiment can control the start / stop of the secondary link based on a predetermined condition at the time of multilink.
  • the process of activating the secondary link is referred to as the link activation process.
  • the process of stopping the secondary link is called the link stop process.
  • FIG. 13 is a flowchart showing an example of execution conditions of the link activation process in the wireless system 1 according to the embodiment.
  • the link management units 120 and 220 execute a series of processes shown in FIG. 13 when only the primary link is in the active mode at the time of multilink.
  • each of the link management units 120 and 220 monitors the buffer amount of the data to which the transmission is assigned to the TID, and confirms whether or not the buffer amount of the data exceeds a predetermined threshold value (. Step S40).
  • Step S41 When the amount of data buffer exceeds a predetermined threshold value, an Awake transition request signal is transmitted between the link management unit 120 of the base station 10 and the link management unit 220 of the terminal 20, and the secondary link in the Doze state wakes up.
  • Step S41 In other words, by executing the link activation process, the STA function of the terminal 20 set as the secondary link shifts from the operation pause mode to the active mode. After that, one of the link management units 120 and 220 transmits data using a plurality of links (primary link and secondary link) constituting the multi-link (step S42).
  • step S43 if the amount of data buffer does not exceed a predetermined threshold value, either the link management unit 120 or 220 transmits data using the primary link (step S43). In other words, any of the link management units 120 and 220 transmits the data by utilizing the multilink substantially as a single link. Each of the link management units 120 and 220 executes the process described above when the data to which transmission is assigned to the multi-link is buffered.
  • FIG. 14 is a flowchart showing an example of execution conditions of the link stop processing in the wireless system 1 according to the embodiment.
  • the link management units 120 and 220 execute a series of processes shown in FIG. 14 when a plurality of links are in the active mode at the time of multi-linking.
  • each of the link management units 120 or 220 monitors the buffer amount of the data to which transmission is assigned to the TID, and confirms whether or not the data buffer amount has fallen below a predetermined threshold value (step). S50).
  • a Doze transition notification signal is transmitted between the link management unit 120 of the base station 10 and the link management unit 220 of the terminal 20, and the secondary link in the active mode is suspended.
  • the mode (Doze state) is set (step S51). In other words, by executing the link stop process, the STA function of the terminal 20 set as the secondary link shifts from the active mode to the operation pause mode. After that, either the link management unit 120 or 220 transmits data using the primary link (step S52).
  • one of the link management units 120 and 220 transmits data using a plurality of links (primary link and secondary link) constituting the multi-link. (Step S53).
  • Each of the link management units 120 and 220 executes the process described above when the data to which transmission is assigned to the multi-link is buffered.
  • FIG. 15 is a flowchart showing a specific example of the link start / stop process in the wireless system 1 according to the embodiment.
  • the link state of the Doze state shown in FIG. 12 is set.
  • the link management unit 220 of the terminal 20 transmits the Awake transition request signal to the access point AP using the primary link (STA1).
  • the link management unit 120 of the base station 10 gives an acknowledgment (“OK”) to the primary link (STA1) when the transition of the secondary link to the active mode can be permitted.
  • the link management unit 220 of the terminal 20 changes the operation mode of the STA 2 set as the secondary link from the operation pause mode to the active mode.
  • each of STA1 and STA2 of the terminal 20 is in the Awake state. That is, the multi-link is in a state where data can be transmitted / received using both the primary link (STA1) and the secondary link (STA2).
  • the link management unit 120 of the base station 10 satisfies the "buffer amount ⁇ predetermined threshold value" when each of the STA 1 and the STA 2 is in the active mode, for example, a beacon signal is used to "buffer”. Notify the terminal 20 that the quantity ⁇ predetermined threshold value "is satisfied (not shown).
  • the link management unit 220 of the terminal 20 transmits the Doze transition notification signal to the access point AP using the primary link (STA1).
  • the link management unit 120 of the base station 10 gives an acknowledgment (“OK”) to the primary link (“OK”) when the transition to the operation hibernation mode of the secondary link can be permitted. It is transmitted to the terminal 20 via the STA1) or the secondary link (STA2).
  • the link management unit 220 of the terminal 20 changes the operation mode of the STA 2 set as the secondary link from the active mode to the operation pause mode.
  • STA1 and STA2 of the terminal 20 are put into the Awake state and the Doze state, respectively. That is, the multi-link is in a state where data can be transmitted / received using only the primary link (STA1).
  • the predetermined threshold value used in the link activation process is set to be equal to or higher than the predetermined threshold value used in the link stop process. As described above, the predetermined threshold value used in the link activation process and the predetermined threshold value used in the link stop process may be different. By providing a margin to these threshold values, the wireless system 1 can suppress the frequent occurrence of the link activation process and the link stop process when the data buffer amount is in the vicinity of each threshold value.
  • FIG. 16 and 17 show specific examples of the wireless frame used in the link start / stop process of the wireless system 1 according to the embodiment.
  • FIG. 16 corresponds to a wireless frame transmitted when the access point AP requests the terminal 20 to start / stop the link.
  • FIG. 17 corresponds to a wireless frame that the terminal 20 returns to the access point AP in response to a request for starting / stopping the link.
  • the frame body of the wireless frame requesting the change of the primary link includes, for example, a terminal identifier AID (Association Identifier), a link start / stop request, and an identifier of the next target link. ..
  • the link management unit 220 of the terminal 20 corresponding to the AID refers to the "identifier of the target link" based on the "link start / stop request" and determines whether or not the link can be started / stopped. do.
  • the frame body of the wireless frame corresponding to the response to the link start / stop request, that is, the acknowledgment includes “OK” as shown in FIG. 17 (a). .. "OK” corresponds to a bit that notifies that the link can be started / stopped.
  • the frame body of the wireless frame corresponding to the response to the link start / stop request that is, the negative response is “NO” as shown in FIG. 17 (b).
  • “Reason” are included.
  • “NO” corresponds to a bit that notifies that the link cannot be started / stopped.
  • “Reason” corresponds to a bit that tells the reason why the link cannot be started / stopped. Note that "Reason" in the wireless frame corresponding to the response to the link start / stop request may be omitted.
  • Base stations and terminals that use wireless LAN may have a plurality of STA functions provided for each band used, for example, 2.4 GHz, 5 GHz, and 6 GHz.
  • a wireless connection is established by selecting one STA function from a plurality of STA functions, and data communication between a base station and a terminal is performed.
  • the unselected STA function is not used even if there is a base station corresponding to the band of the STA function.
  • the wireless system 1 utilizes a plurality of STA functions provided in each of the base station 10 and the terminal 20 to establish a multi-link between the base station 10 and the terminal 20.
  • a plurality of bands can be used together, and the functions of the wireless LAN device can be fully utilized.
  • the wireless system 1 according to the embodiment can realize efficient communication and can improve the communication speed.
  • the power consumption of the multi-link is higher than that of the single link because the base station 10 and the terminal 20 each use a plurality of STA functions. From the viewpoint of power saving, it is preferable that a single link is used when the traffic is not stagnant, and a multi-link is used when the traffic is stagnant.
  • the wireless system 1 switches between the single link and the multi-link to perform data communication after the multi-link is established. Specifically, after the multi-link is established, the link management unit 120 of the base station 10 and the link management unit 220 of the terminal 20 exchange an Awake transition request signal / Doze transition notification signal to activate the secondary link. / Control stop.
  • start link corresponds to setting to active mode
  • stop link corresponds to setting to hibernate mode.
  • the activation / stop of the secondary link is determined based on the buffer amount of the transmitted data. For example, when the amount of data buffer is large, high-speed data communication using a plurality of links constituting the multi-link is executed. On the other hand, when the amount of data buffer is small, only one of the multiple links constituting the multilink (primary link) is set to the active mode, and the other links (secondary link) are set to the hibernate mode. Set. In this case, the multi-link executes data communication in a state substantially similar to that of a single link.
  • the wireless system 1 according to the embodiment uses the multi-link setting that prioritizes performance when the amount of data buffer is large, and prioritizes power saving when the amount of data buffer is small. Use the settings of. As a result, the wireless system 1 according to the embodiment can suppress the retention of traffic and the power consumption of the terminal 20.
  • FIG. 18 is a flowchart showing an example of execution conditions of the link activation process in the first modification of the embodiment.
  • the flowchart shown in FIG. 18 has a configuration in which step S40 of the flowchart shown in FIG. 13 is replaced with step S60.
  • step S60 one of the link management units 120 and 220 monitors the remaining amount of the battery of the terminal 20 and confirms whether or not the remaining amount of the battery exceeds a predetermined threshold value (step S60).
  • step S60 YES
  • the process proceeds to step S41, and the link activation process is executed.
  • step S60, NO the process of step S43 is executed.
  • FIG. 19 is a flowchart showing an example of execution conditions of the link stop processing in the first modification of the embodiment.
  • the flowchart shown in FIG. 19 has a configuration in which step S50 of the flowchart shown in FIG. 14 is replaced with step S61.
  • step S61 one of the link management units 120 and 220 monitors the remaining amount of the battery of the terminal 20 and confirms whether or not the remaining amount of the battery has fallen below a predetermined threshold value (step S61).
  • a predetermined threshold value YES in step S61
  • the process proceeds to the process of step S51, and the link stop process is executed.
  • the process of step S53 is executed.
  • Other configurations and operations of the wireless system 1 according to the first modification of the embodiment are the same as those of the embodiment.
  • the remaining battery level of the terminal 20 may be used as the execution condition of the link start / stop process.
  • the multi-link setting that prioritizes performance is used when the battery level of the terminal 20 is high, and the multi-link that prioritizes power saving when the battery level of the terminal 20 is low is used. Settings are used.
  • the wireless system 1 according to the first modification of the embodiment can suppress the power consumption of the terminal 20 by changing the number of links used according to the remaining battery level of the terminal 20 in this way.
  • the predetermined threshold value used in the link activation process is set to be equal to or higher than the predetermined threshold value used in the link stop process.
  • the predetermined threshold value used in the link activation process and the predetermined threshold value used in the link stop process may be the same or different.
  • FIG. 20 is a flowchart showing an example of execution conditions of the link activation process in the second modified example of the embodiment.
  • the flowchart shown in FIG. 20 has a configuration in which step S40 of the flowchart shown in FIG. 13 is replaced with step S70.
  • each of the link management units 120 and 220 monitors the total traffic amount (independent of TID) assigned to the multi-link, and determines whether or not the traffic amount exceeds a predetermined threshold value. Confirm (step S70).
  • the traffic to be monitored is not limited to the whole, and at least one specific TID may be selected.
  • the process proceeds to step S41, and the link activation process is executed.
  • the process of step S43 is executed.
  • FIG. 21 is a flowchart showing an example of execution conditions of the link stop processing in the second modification of the embodiment.
  • the flowchart shown in FIG. 21 has a configuration in which step S50 of the flowchart shown in FIG. 14 is replaced with step S71.
  • each of the link management units 120 and 220 monitors the traffic amount assigned to the multi-link and confirms whether or not the traffic amount has fallen below a predetermined threshold value (step S71).
  • a predetermined threshold value step S71, YES
  • the process proceeds to the process of step S41, and the link stop process is executed.
  • the process of step S53 is executed.
  • the "predetermined threshold value" used in this modification is set for each traffic type, for example.
  • each of the processes of steps S70 and S71 described above is executed for each traffic type.
  • each of the link management units 120 and 220 executes the link activation process based on the determination of step S70 corresponding to at least one of the plurality of traffic types being “YES”.
  • each of the link management units 120 and 220 executes the link stop processing based on the determination of step S71 corresponding to at least one traffic type among the plurality of traffic types being “YES”.
  • Other configurations and operations of the wireless system 1 according to the second modification of the embodiment are the same as those of the embodiment.
  • the traffic amount may be used as the execution condition of the link start / stop process.
  • the multi-link setting which gives priority to performance is used, and when the traffic amount is small, the multi-link setting which gives priority to power saving is used.
  • the wireless system 1 according to the second modification of the embodiment can obtain the same effect as that of the embodiment by changing the number of links used according to the traffic amount in this way.
  • the predetermined threshold value used in the link activation process is set to be equal to or higher than the predetermined threshold value used in the link stop process.
  • the predetermined threshold value used in the link activation process and the predetermined threshold value used in the link stop process may be the same or different.
  • FIG. 22 is a flowchart showing an example of execution conditions of the link activation process in the third modified example of the embodiment.
  • the flowchart shown in FIG. 22 has a configuration in which steps S40 and S42 of the flowchart shown in FIG. 13 are replaced with steps S80 and 82, respectively.
  • each of the link management units 120 and 220 confirms whether or not there is an important traffic in the traffic accumulated in the multi-link.
  • the link activation process is executed by moving to the process of step S41, and the important traffic is transmitted using the secondary link waked up by the subsequent process of step S81.
  • the process of step S43 is executed.
  • FIG. 23 is a flowchart showing an example of the execution condition of the link stop processing in the second modification of the embodiment.
  • the flowchart shown in FIG. 23 has a configuration in which steps S50 and S53 of the flowchart shown in FIG. 14 are replaced with steps S82 and S83, respectively.
  • each of the link management units 120 and 220 confirms whether or not there is an important traffic in the traffic accumulated in the multi-link. If there is no important traffic (step S82, YES), the process proceeds to step S51 and the link stop process is executed. On the other hand, if there is an important traffic (step S82, NO), the important traffic is transmitted using the secondary link by the process of step S83.
  • the "important traffic" used in this modification is set to, for example, Low Latency (LL) traffic.
  • the important traffic may be any traffic that requires high reliability from the upper level, and is not limited to the LL traffic.
  • Other important traffic includes, for example, traffic including payment information and authentication information.
  • Other configurations and operations of the wireless system 1 according to the third modification of the embodiment are the same as those of the embodiment.
  • the presence or absence of important traffic may be used as the execution condition of the link start / stop process.
  • the secondary link when there is important traffic, the secondary link is used only for transmitting the important traffic, and when there is no important traffic amount, the multi-link setting that gives priority to power saving is used.
  • the wireless system 1 according to the third modification of the embodiment can improve the communication quality of the important traffic by occupying the secondary link in the important traffic in this way.
  • the radio system 1 according to the fourth modified example of the embodiment relates to a control method when the base station 10 establishes a multi-link with each of a plurality of terminals 20.
  • a case where the base station 10 establishes a multi-link with each of the terminals 20A and 20B will be described as an example.
  • the same channel is assigned to the STA1 of the terminal 20A and the STA1 of the terminal 20B, and the same channel is assigned to the STA2 of the terminal 20A and the STA2 of the terminal 20B.
  • FIG. 24 is a flowchart showing a specific example of the link start / stop process in the wireless system 1 according to the fourth modification of the embodiment.
  • STA1 is set as the primary link and STA2 is set as the secondary link in each of the terminals 20A and 20B.
  • STA1 and STA2 of the terminal 20A are set to the Awake state and the Doze state, respectively, and each of the STA1 and STA2 of the terminal 20B is set to the Awake state.
  • the access point AP when the access point AP detects the LL traffic, it transmits a beacon signal including information indicating that the terminal 20A has the LL traffic, and the beacon signal is the primary link of the terminals 20A and 20B, respectively. Received by (STA1). Then, the STA1 of the terminal 20A sends an Awake transition request signal to the access point AP, and the access point AP returns an acknowledgment to the STA1 of the terminal 20A. As a result, the STA2 of the terminal 20A shifts from the operation pause mode to the active mode, and the STA2 of the terminal 20A is in a state where the LL traffic can be transmitted.
  • the access point AP detects the LL traffic in the STA2 of the terminal 20A
  • the access point AP transmits a beacon signal including information indicating that the LL traffic of the terminal 20A exists, and the beacon signal is the primary link of the terminals 20A and 20B, respectively.
  • the STA1 of the terminal 20B sends a Doze transition notification signal to the access point AP, and the access point AP returns an acknowledgment to the STA1 of the terminal 20B.
  • the STA2 of the terminal 20B shifts from the active mode to the operation pause mode.
  • the radio system 1 can improve the communication quality of the LL traffic by exclusively using the channel of the secondary link to which the LL traffic is assigned in this way.
  • FIG. 25 shows a specific example of the wireless frame used in the link start / stop process of the wireless system 1 according to the fourth modification of the embodiment, and corresponds to the beacon signal shown in FIG. 24.
  • the frame body of the wireless frame including the information indicating the presence / absence of LL traffic includes, for example, the terminal identifier AID (Association Identifier), the information indicating the presence / absence of use of Low Latency, and the identifier of the target link. I'm out.
  • the link management unit 220 of each terminal 20 confirms "whether or not Low Latency is used (whether or not LL traffic is used)" when the AID included in the beacon signal is different from its own AID. Then, when the link management unit 220 detects that "Low Latency is used", whether or not the channel corresponding to the "identifier of the target link” and the channel used in its own multi-link match. To confirm. When the link management unit 220 detects a channel match, the link management unit 220 executes a link stop process for the secondary link corresponding to the channel. Thereby, the wireless system 1 can perform the operation described with reference to FIG. 24.
  • a set of information shown in FIG. 25 may be included in a plurality of types in one beacon signal.
  • the radio system 1 according to the fifth modification of the embodiment establishes the same multi-link as that of the embodiment by using a plurality of channel CHs included in the same frequency band.
  • the multi-link processing in the fifth modification of the embodiment is the same as that in which the channel used for the multi-link is changed to a plurality of channel CHs included in the same frequency band with respect to the multi-link processing of the embodiment.
  • FIG. 26 shows an example of a frequency band used for wireless communication in the wireless system 1 according to the fifth modification of the embodiment.
  • a 2.4 GHz band, a 5 GHz band, and a 6 GHz band are used in wireless communication.
  • Each frequency band contains a plurality of channels.
  • each of the 2.4 GHz band, 5 GHz band, and 6 GHz band contains at least three channels CH1, CH2, and CH3. Communication using each channel CH is realized by the associated STA function.
  • FIG. 27 shows an example of the link management information 121 in the wireless system 1 according to the fifth modification of the embodiment.
  • the link management information 121 in the fifth modification of the embodiment has a configuration in which information regarding the channel ID for each frequency band is added to the link management information 121 in the embodiment. ..
  • the same multi-link as in the embodiment is established by using the channel CH2 of "STA1" corresponding to the frequency band of 6 GHz and the channel CH3 of "STA2" corresponding to the frequency band of 6 GHz. ..
  • the same frequency band may be used for each STA function of the base station 10 and the terminal 20.
  • the multi-link between the base station 10 and the terminal 20 may be established by a plurality of STA functions using the same frequency band.
  • a plurality of STA functions may form a multi-link using, for example, different channel channels in the 5 GHz band.
  • the wireless system 1 according to the fifth modification of the embodiment can realize efficient communication and suppress power consumption as in the embodiment.
  • FIG. 28 shows an example of data allocation in the multi-link of the wireless system according to the third modification of the embodiment. If critical traffic is detected, various data may be assigned to the primary and secondary links, as shown in FIG.
  • the first example shows a case where the primary link is assigned the conventional traffic and the secondary link is assigned the increased traffic.
  • the second example shows a case where the primary link is assigned a traffic with a large data size (for example, TCP traffic) and the secondary link is assigned with a traffic with a small data size (for example, ACK).
  • TCP traffic for example, TCP traffic
  • ACK small data size
  • FIG. 29 shows an example of execution conditions of the link stop processing in the wireless system 1 according to the combination of the embodiment and the first modification of the embodiment.
  • the determination of step S50 described in the embodiment is executed, and when the determination of step S50 is “NO”, the determination of step S61 described in the first modification of the embodiment is performed. May be executed. In this case, when the determination in step S61 becomes "YES", the process proceeds to, for example, step S51.
  • two or more of the above-described embodiment and each modification may be combined, and the effects of the combined embodiment and modification can be obtained.
  • each STA function may notify the corresponding link management unit when the link cannot be maintained due to the movement of the terminal 20 or the like.
  • the link management unit 220 of the terminal 20 may change the multi-link state with the link management unit 120 of the base station 10 based on the notification from the STA function. Specifically, for example, the link management unit 220 of the terminal 20 and the link management unit 120 of the base station 10 may appropriately change the STA function used in the multi-link.
  • the link management units 120 and 220 update the link management information 121 and 221, respectively. Further, the link management units 120 and 220 may update the association between the traffic and the STA function according to the increase or decrease in the number of links.
  • the terminal 20 requests the base station 10 to establish the multi-link in the multi-link processing has been illustrated, but the present invention is not limited to this.
  • the base station 10 may request the terminal 20 to establish a multi-link based on the fact that a plurality of links have been established between the base station 10 and the terminal 20.
  • the “predetermined threshold value” used in the link activation process and the “predetermined threshold value” used in the link stop process may be the same or different.
  • each of the primary link and the secondary link is set to the active mode after the multi-link processing is illustrated, but the present invention is not limited to this.
  • the primary link may be set to active mode, and the secondary link may be set to either active mode or hibernate mode.
  • the secondary link may be switched between hibernation mode and active mode based on predetermined conditions.
  • the configuration of the wireless system 1 according to the embodiment is only an example, and other configurations may be used.
  • the base station 10 may include at least two radio signal processing units.
  • the terminal 20 may include at least two radio signal processing units.
  • the number of channels that can be processed by each STA function can be appropriately set according to the frequency band used.
  • Each of the wireless communication modules 14 and 24 may support wireless communication in a plurality of frequency bands by a plurality of communication modules, or may support wireless communication in a plurality of frequency bands by one communication module.
  • the functional configurations of the base station 10 and the terminal 20 in the wireless system 1 are merely examples.
  • the functional configurations of the base station 10 and the terminal 20 may have other names and groups as long as they can perform the operations described in each embodiment.
  • the data processing unit 110 and the link management unit 120 may be collectively referred to as a data processing unit.
  • the data processing unit 210 and the link management unit 220 may be collectively referred to as a data processing unit.
  • the CPU included in each of the base station 10 and the terminal 20 may be another circuit.
  • MPU Micro Processing Unit
  • each of the processes described in each embodiment may be realized by dedicated hardware.
  • the wireless system 1 according to each embodiment may have a mixture of processes executed by software and processes executed by hardware, or may be only one of them.
  • the flowchart used to explain the operation is just an example. Each operation described in the embodiment may be interchanged within the range in which the order of processing is possible, or other processing may be added. Further, the format of the wireless frame described in the above embodiment is merely an example. The radio system 1 may use other radio frame formats as long as it is possible to perform the operations described in each embodiment.
  • the present invention is not limited to the above embodiment, and can be variously modified at the implementation stage without departing from the gist thereof.
  • each embodiment may be carried out in combination as appropriate, in which case the combined effect can be obtained.
  • the above-described embodiment includes various inventions, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent requirements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, if the problem can be solved and the effect is obtained, the configuration in which the constituent elements are deleted can be extracted as an invention.
  • Wireless system 10 ... Base station 20 ... Terminal 30 ... Servers 11 and 21 ... CPU 12, 22 ... ROM 13, 23 ... RAM 14, 24 ... Wireless communication module 15 ... Wired communication module 25 ... Display 26 ... Storage 110, 210 ... Data processing unit 120, 220 ... Link management unit 121,221 ... Link management information 122, 222 ... Association processing unit 123, 223 ... Authentication processing unit 124 ... Data categorization unit 125 ... Transmission queue 126 ... CSMA / CA execution unit 127 ... Data collision management unit 130, 140, 150, 230, 240, 250 ... Wireless signal processing unit

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EP20947700.9A EP4192153A4 (en) 2020-07-27 2020-07-27 BASE STATION AND TERMINAL DEVICE
PCT/JP2020/028673 WO2022024172A1 (ja) 2020-07-27 2020-07-27 基地局及び端末
US18/017,932 US12446089B2 (en) 2020-07-27 2020-07-27 Base station and terminal apparatus
JP2024061707A JP7768281B2 (ja) 2020-07-27 2024-04-05 端末
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