WO2023197843A1 - 一种通信的方法和装置 - Google Patents

一种通信的方法和装置 Download PDF

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Publication number
WO2023197843A1
WO2023197843A1 PCT/CN2023/083407 CN2023083407W WO2023197843A1 WO 2023197843 A1 WO2023197843 A1 WO 2023197843A1 CN 2023083407 W CN2023083407 W CN 2023083407W WO 2023197843 A1 WO2023197843 A1 WO 2023197843A1
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WIPO (PCT)
Prior art keywords
sta
mld
information
key
bss
Prior art date
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PCT/CN2023/083407
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English (en)
French (fr)
Inventor
淦明
林游思
杨讯
李云波
郭宇宸
黄国刚
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to KR1020247036231A priority Critical patent/KR20240167072A/ko
Priority to JP2024560318A priority patent/JP7810825B2/ja
Priority to CA3248751A priority patent/CA3248751A1/en
Priority to EP23787490.4A priority patent/EP4492854A4/en
Priority to AU2023251651A priority patent/AU2023251651A1/en
Publication of WO2023197843A1 publication Critical patent/WO2023197843A1/zh
Priority to MX2024012514A priority patent/MX2024012514A/es
Priority to US18/910,443 priority patent/US20250039967A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • 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
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • 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 embodiments of the present application relate to the field of communications, and more specifically, to a communication method and device.
  • OFDMA orthogonal frequency division multiple access
  • the next generation WiFi standard IEEE 802.11be is called extremely high throughput (EHT) or Wi-Fi 7. Its most important technical goal is to significantly improve the peak throughput rate.
  • IEEE 802.11be standard WLAN equipment supports multiple stream numbers (the maximum number of spatial streams is 16), multiple frequency bands (for example, 2.4GHz, 5GHz and 6GHz frequency bands), and the cooperation of multiple channels on the same frequency band. Peak throughput rate, reducing service transmission delay.
  • the multi-frequency bands or multi-channels may be collectively referred to as multi-links.
  • the next generation IEEE 802.11 standard station equipment that supports multiple links at the same time is called a multi-link device (MLD).
  • MLD multi-link device
  • the traffic indication map (TIM) broadcast feature means that a station (station, STA) or a site multi-link device can receive TIM frames within a specified time interval to obtain the station or site multi-link device.
  • BSS basic service set
  • the site multi-link device cannot obtain the update information of the key BSS parameters. The method affects the reliability of communication.
  • the embodiments of the present application provide a communication method and device, which can improve the reliability of communication.
  • a communication method is provided, which is applied to the first access point multi-link device (AP MLD).
  • the method can be executed by the first AP MLD, or it can also be performed by the first AP MLD.
  • the chip or circuit configured in the first AP MLD executes, and this application does not limit this. The following takes the execution by the first AP MLD as an example for explanation.
  • the method may include: the first AP of the first AP MLD generates first information, the first information is used to indicate whether a key BSS parameter corresponding to at least one AP in the first AP MLD changes; the first AP reports to the first site A multi-link device (station multi-link device, STA MLD) sends the first information.
  • the first AP of the first AP MLD generates first information, the first information is used to indicate whether a key BSS parameter corresponding to at least one AP in the first AP MLD changes; the first AP reports to the first site A multi-link device (station multi-link device, STA MLD) sends the first information.
  • STA MLD station multi-link device
  • the first AP may indicate to the first STA MLD the first AP MLD through the first information. Whether the key BSS parameter corresponding to one less AP changes, further, the first STA can determine whether to obtain the key BSS parameter of the AP of the first AP MLD based on the first information. In this way, when the key BSS parameters corresponding to at least one AP in the first AP MLD change, the first STA MLD can learn in time, so that the first STA MLD and the first AP MLD can communicate normally, which helps to improve Communication reliability.
  • the first information is a count value.
  • the value of the first information increases.
  • the value of the first information remains unchanged.
  • the first information is carried in a beacon check field.
  • this application can reuse the beacon check field, has high flexibility and strong realizability.
  • the beacon check field is carried in the service indication bitmap TIM frame.
  • the embodiments of the present application are compatible with non-multi-link sites, so that non-multi-link sites can also correctly parse TIM frames, and have strong scalability.
  • the first information is used to indicate that the key BSS parameter corresponding to at least one AP in the first AP MLD has changed
  • the method further includes: the first AP receives the first frame, the first frame is used to request the key BSS parameters corresponding to the AP associated with the second STA.
  • the second STA is the site associated with the first AP MLD in the first STA MLD; the first AP sends the second frame, and the The second frame includes key BSS parameters corresponding to the AP associated with the second STA.
  • the first STA determines that the key BSS parameters corresponding to at least one AP in the first AP MLD have changed, the first STA can also obtain the key BSS parameters of the AP associated with the second STA through the first frame and the second frame. , helping to improve the communication reliability of the first STA MLD.
  • the second STA is all STAs in the MLD of the first STA.
  • the key BSS parameters include one or more of the following: including a channel change notification element, including an extended channel change notification element, and changing enhanced distributed channel access EDCA parameters Elements, including static elements, modify direct sequence spread spectrum DSSS parameter set, modify contention-free CF parameter set elements, modify high-throughput HT operation elements, including wide-bandwidth channel change elements, include wide-bandwidth channel change envelope elements, include operations Mode notification elements, including static channel elements, modified very high throughput VHT operation elements, modified high-efficiency HE operation elements, insertion of broadcast TWT elements, including BSS color change notification elements, modified multi-user EDCA parameter set elements, modified spatial multiplexing parameter sets Elements, modify elements for extremely high throughput operations.
  • a channel change notification element including an extended channel change notification element
  • changing enhanced distributed channel access EDCA parameters Elements including static elements, modify direct sequence spread spectrum DSSS parameter set, modify contention-free CF parameter set elements, modify high-throughput HT operation elements, including wide-bandwidth channel change elements, include wide-bandwidth
  • a communication method is provided, which is applied to the first station multi-link device (station multi-link device, STA MLD).
  • the method can be executed by the first STA MLD, or it can also be configured by the first STA MLD.
  • a chip or circuit in a STA MLD is executed, which is not limited by this application. The following takes the execution by the first STA MLD as an example for explanation.
  • the method may include: the first STA of the first STA MLD receives first information, the first information is used to indicate whether a key BSS parameter corresponding to at least one AP in the first AP MLD changes; the first STA changes according to the first The information determines whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed.
  • the first AP may indicate to the first STA MLD the first AP MLD through the first information. Whether the key BSS parameter corresponding to one less AP changes, further, the first STA can determine whether to obtain the key BSS parameter of the AP of the first AP MLD based on the first information. In this way, when the key BSS parameters corresponding to at least one AP in the first AP MLD change, the first STA MLD can learn in time, so that the first STA MLD and the first AP MLD can communicate normally, which helps to improve Communication reliability.
  • the first information is a count value.
  • the method further includes: the first STA records the first information.
  • the first STA determines whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed based on the first information, including: the first station determines according to the first Whether the value of the first information and the value of the second information are the same determines whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed, wherein the second information is the previous time the first STA received the first information. The received information, and the second information is used to indicate whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed.
  • the first station determines at least one AP in the first AP MLD based on whether the value of the first information and the value of the second information are the same. Whether the corresponding key BSS parameters have changed, including: if the value of the first information and the value of the second information are the same, then the first STA determines that the key BSS parameters corresponding to all APs in the first AP MLD have not changed; And/or, if the value of the first information and the value of the second information are different, the first STA determines that the key BSS parameter corresponding to at least one AP in the first AP MLD has changed.
  • the value of the first information is different from the value of the second information.
  • the method also includes: the second STA of the first STA MLD receives the beacon frame,
  • the beacon frame includes the key BSS parameters corresponding to the AP associated with the second STA, which is the station associated with the first AP MLD in the first STA MLD.
  • both the first STA and the second STA can receive the beacon frame, thereby obtaining the key BSS of the AP associated with the STA. Parameters, in this way, the second STA in the first STA MLD can also obtain the key BSS parameters of the BSS where it is located, which helps to improve the communication reliability of the second STA.
  • the value of the first information is different from the value of the second information.
  • the method further includes: the first STA sends a first frame, and the first frame is In requesting the key BSS parameters corresponding to the AP associated with the second STA, the second STA is the station associated with the first AP MLD in the first STA MLD; the first station receives the second frame, and the second frame includes the second STA Key BSS parameters corresponding to the associated AP.
  • the first STA determines that the key BSS parameters corresponding to at least one AP in the first AP MLD have changed, the first STA can also obtain the key BSS parameters of the AP associated with the second STA through the first frame and the second frame. , helping to improve the communication reliability of the first STA MLD.
  • the second STA is all STAs in the MLD of the first STA.
  • the first information is carried in a beacon check field.
  • this application can reuse the beacon check field, has high flexibility and strong realizability.
  • the beacon check field is carried in the service indication bitmap TIM frame.
  • the embodiments of the present application are compatible with non-multi-link sites, so that non-multi-link sites can also correctly parse TIM frames, and have strong scalability.
  • the key BSS parameter includes one or more of the following: including a channel change notification element, including an extended channel change notification element, changing EDCA parameter elements, including a static element, Modify the DSSS parameter set, modify the CF parameter set element, modify the HT operation element, include the wide bandwidth channel change element, include the wide bandwidth channel change envelope element, include the operation mode notification element, include the static channel element, modify the VHT operation element, modify HE operation elements, insert broadcast TWT elements, include BSS color change notification elements, modify multi-user EDCA parameter set elements, modify spatial multiplexing parameter set elements, and modify extremely high throughput operation elements.
  • a communication device which may be the first AP MLD, or a chip or circuit configured in the first AP MLD.
  • the device may be the first AP of the first AP MLD, or a chip or circuit configured in the first AP of the first AP MLD.
  • the device includes: a processing unit, used to generate first information, the first information is used to indicate whether the key BSS parameter corresponding to at least one AP in the device has changed; a transceiver unit, used to send the first STA MLD First information.
  • the first information is a count value.
  • the value of the first information increases.
  • the value of the first information remains unchanged.
  • the first information is carried in the beacon check field.
  • the beacon check field is carried in the service indication bitmap TIM frame.
  • the first information is used to indicate that the key BSS parameter corresponding to at least one AP in the device has changed
  • the transceiver unit is also used to: receive a message from the first STA.
  • the first frame is used to request the key BSS parameters corresponding to the AP associated with the second STA.
  • the second STA is the station associated with the device in the MLD of the first STA; sending the second frame to the first STA,
  • the second frame includes key BSS parameters corresponding to the AP associated with the second STA.
  • the second STA is all STAs in the MLD of the first STA.
  • the key BSS parameters include one or more of the following: including channel change notification elements, including extended channel change notification elements, and changing enhanced distributed channel access EDCA parameters Elements, including static elements, modify direct sequence spread spectrum DSSS parameter set, modify contention-free CF parameter set elements, modify high-throughput HT operation elements, including wide-bandwidth channel change elements, include wide-bandwidth channel change envelope elements, include operations Mode notification elements, including static channel elements, modified very high throughput VHT operation elements, modified high-efficiency HE operation elements, insertion of broadcast TWT elements, including BSS color change notification elements, modified multi-user EDCA parameter set elements, modified spatial multiplexing parameter sets Elements, modify elements for extremely high throughput operations.
  • a communication device may be the first STA MLD, or may be configured on the first STA MLD.
  • the chip or circuit in the STA MLD may be the first STA of the first STA MLD and/or the second STA, or a chip or circuit configured in the first STA and/or the second STA of the first STA MLD.
  • the device may include: a transceiver unit, configured to receive first information, the first information being used to indicate whether a key BSS parameter corresponding to at least one AP in the first AP MLD has changed; a processing unit, configured to determine based on the first information First AP Whether the key BSS parameters corresponding to at least one AP in the MLD have changed.
  • the first information is a count value.
  • the processing unit is further configured to: record the first information.
  • the processing unit is specifically configured to: determine the value corresponding to at least one AP in the first AP MLD according to whether the value of the first information and the value of the second information are the same. Whether the key BSS parameters have changed, where the second information is the information received last time the device received the first information, and the second information is used to indicate the key BSS parameters corresponding to at least one AP in the first AP MLD whether changes have occurred.
  • the processing unit is specifically configured to: if the value of the first information and the value of the second information are the same, determine the values corresponding to all APs in the first AP MLD None of the key BSS parameters have changed; and/or, if the value of the first information and the value of the second information are different, it is determined that the key BSS parameter corresponding to at least one AP in the first AP MLD has changed.
  • the device further includes: a first transceiver unit configured to receive a beacon frame, the The beacon frame includes key BSS parameters corresponding to the AP associated with the second STA, which is a station in the device associated with the first AP MLD.
  • the transceiver unit is further configured to: send a first frame, the first frame is used for requesting The key BSS parameters corresponding to the AP associated with the second STA, which is the station associated with the first AP MLD in the device; receiving the second frame, the second frame including the key BSS parameters corresponding to the AP associated with the second STA .
  • the second STA is all STAs in the device.
  • the first information is carried in a beacon check field.
  • the beacon check field is carried in a service indication bitmap TIM frame.
  • the key BSS parameter includes one or more of the following: including a channel change notification element, including an extended channel change notification element, changing EDCA parameter elements, including a static element, Modify the DSSS parameter set, modify the CF parameter set element, modify the HT operation element, include the wide bandwidth channel change element, include the wide bandwidth channel change envelope element, include the operation mode notification element, include the static channel element, modify the VHT operation element, modify HE operation elements, insert broadcast TWT elements, include BSS color change notification elements, modify multi-user EDCA parameter set elements, modify spatial multiplexing parameter set elements, and modify extremely high throughput operation elements.
  • a communication device including a processor.
  • the processor is coupled to a memory and can be used to execute instructions in the memory to implement the method in the above first aspect and any possible implementation of the first aspect, or the second aspect and any possible implementation of the second aspect. method within the method.
  • the device further includes memory.
  • the device further includes a communication interface, and the processor is coupled to the communication interface.
  • the device is the first AP MLD.
  • the communication interface may be a transceiver, or an input/output interface.
  • the device is a chip configured in the first APMLD.
  • the communication interface may be an input/output interface.
  • the device is the first STA MLD.
  • the communication interface may be a transceiver, or an input/output interface.
  • the device is a chip configured in the first STAMLD.
  • the communication interface may be an input/output interface.
  • the device is a chip or a system-on-a-chip.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • a sixth aspect provides a computer-readable storage medium on which a computer program is stored.
  • the computer program When executed by a device, it causes the device to implement the first aspect and any of the possible implementations of the first aspect. method, or the method in the second aspect and any possible implementation manner of the second aspect.
  • a seventh aspect provides a computer program product containing instructions that, when executed by a computer, cause a device to implement the first aspect and the method in any possible implementation of the first aspect, or the second aspect and the second aspect. method in any possible implementation.
  • a communication system including the first AP MLD and the first STA MLD as mentioned above.
  • Figure 1 is a schematic structural diagram of an AP MLD and a STA MLD provided by an embodiment of the present application.
  • Figure 2 is a schematic structural diagram of a communication system provided by an embodiment of the present application.
  • Figure 3 shows a schematic frame structure diagram of a TIM frame provided by an embodiment of the present application.
  • Figure 4 shows a schematic frame structure diagram of a TIM frame provided by an embodiment of the present application.
  • Figure 5 shows a schematic frame structure diagram of a TIM frame provided by an embodiment of the present application.
  • Figure 6 is a schematic diagram of a communication method provided by an embodiment of the present application.
  • Figure 7 is a schematic block diagram of a communication device provided by an embodiment of the present application.
  • Figure 8 is a schematic block diagram of a communication device provided by an embodiment of the present application.
  • the wireless communication system applicable to the embodiments of this application may be a wireless local area network (WLAN) or a cellular network.
  • the communication method may be implemented by a communication device in the wireless communication system or a chip or processor in the communication device.
  • the communication method can be a wireless communication device that supports multiple links for parallel transmission, for example, called a multi-link device (Multi-link device) or a multi-band device (multi-band device). Compared with devices that only support single-link transmission, multi-link devices have higher transmission efficiency and higher throughput.
  • a multi-link device includes one or more affiliated STAs (affiliated STAs).
  • An affiliated STA is a logical station and can work on one link.
  • the affiliated station can be an access point (Access Point, AP) or a non-access point station (non-Access Point Station, non-AP STA).
  • a multi-link device whose site is an AP can be called a multi-link AP or a multi-link AP device or an AP multi-link device (AP MLD).
  • the link device may be called a multi-link STA or a multi-link STA device or an STA multi-link device (STA MLD).
  • the multi-link device includes the subordinate STA is also briefly described as "the multi-link device includes the STA” in the embodiment of this application.
  • multi-link devices include multiple logical sites, each logical site works on one link, but multiple logical sites are allowed to work on the same link.
  • Multi-link devices can communicate wirelessly by following the 802.11 family of protocols, for example, following an extremely high throughput (EHT) site, or following an 802.11be-based or compatible site that supports 802.11be, to communicate with other devices, of course Other devices may or may not be multilink devices.
  • EHT extremely high throughput
  • the multi-link device in the embodiment of the present application may be a single-antenna device or a multi-antenna device.
  • it can be a device with more than two antennas.
  • the embodiment of the present application does not limit the number of antennas included in the multi-link device.
  • the multi-link device can allow services of the same access type to be transmitted on different links, and even allows the same data packet to be transmitted on different links; it may also not allow services of the same access type to be transmitted. Transmit on different links, but allow services of different access types to be transmitted on different links.
  • the multi-link device is a device with wireless communication function.
  • the device can be a complete machine device, or it can be a chip or processing system installed in the complete machine device.
  • the device installing these chips or processing systems
  • the methods and functions of the embodiments of the present application can be implemented under the control of these chips or processing systems.
  • the STA MLD in the embodiment of the present application has a wireless transceiver function, can support the 802.11 series protocols, and can communicate with the AP MLD or other STA MLD or single-link devices.
  • the STA MLD allows users to communicate with the AP and then with Any user communication device for WLAN communication.
  • STA MLD can be a tablet, desktop, laptop, notebook, ultra-mobile Personal Computer (UMPC), handheld computer, netbook, personal digital assistant (Personal Digital Assistant, PDA), mobile phone
  • UMPC Ultra-mobile Personal Computer
  • PDA Personal Digital Assistant
  • STA MLD can also be the chips and processing systems in these terminals.
  • the AP MLD in the embodiment of this application is a device that provides services to the STA MLD and can support the 802.11 series protocols.
  • AP MLD can be communication entities such as communication servers, routers, switches, and bridges, or the AP MLD can include various forms of macro base stations, micro base stations, relay stations, etc.
  • AP MLD can also be these various forms. chips and processing systems in the equipment, thereby realizing the methods and functions of the embodiments of the present application.
  • multi-link devices can support high-speed and low-latency transmission.
  • multi-link devices can also be used in more scenarios, such as sensor nodes in smart cities (for example, Smart water meters, smart electricity meters, smart air detection nodes), smart devices in smart homes (such as smart cameras, projectors, displays, TVs, speakers, refrigerators, washing machines, etc.), nodes in the Internet of Things, entertainment terminals (such as AR, VR and other wearable devices), smart devices in smart offices (such as printers, projectors, etc.), Internet of Vehicles devices in the Internet of Vehicles, and some infrastructure in daily life scenes (such as vending machines, supermarkets, etc.) Self-service navigation desk, self-service cashier equipment, self-service ordering machine, etc.).
  • sensor nodes in smart cities for example, Smart water meters, smart electricity meters, smart air detection nodes
  • smart devices in smart homes such as smart cameras, projectors, displays, TVs, speakers, refrigerators, washing machines, etc.
  • nodes in the Internet of Things entertainment terminals (such as AR, VR and other wearable devices)
  • smart devices in smart offices such as printers
  • the 802.11 protocol may be a protocol that supports 802.11be or is compatible with 802.11be.
  • the frequency bands in which multi-link devices work may include but are not limited to: sub 1GHz, 2.4GHz, 5GHz, 6GHz and high frequency 60GHz.
  • the multi-link device in the embodiment of the present application may be a single-antenna device or a multi-antenna device.
  • the multi-link device in the embodiment of the present application may be a device with more than two antennas.
  • the embodiment of the present application does not limit the number of antennas included in the multi-link device.
  • Figure 1 is a schematic structural diagram of an AP MLD and a STA MLD provided by an embodiment of the present application.
  • Figure 1 shows the structural diagram of AP MLD with multiple antennas and STA MLD with single antenna.
  • the 802.11 standard focuses on the physical layer (PHY) and media access control (MAC) in AP MLD and STA MLD. layer part.
  • a link identifier represents a site working on a link. That is, if there is more than one site on a link, more than one link identifier represents them.
  • the link mentioned below sometimes also refers to the site working on this link.
  • AP MLD and STA MLD can use link identifiers to identify a link or a station on a link during data transmission.
  • the AP MLD and the STA MLD can first negotiate or communicate the corresponding relationship between the link identifier and a link or a station on a link, or the AP broadcast link identifier of the AP MLD is associated with a link or a link. Correspondence to the sites on. Therefore, during data transmission, a large amount of signaling information is not transmitted to indicate the link or the station on the link, and only the link identifier is carried, which reduces signaling overhead and improves transmission efficiency.
  • the management frame sent by the AP MLD when establishing a basic service set will carry an element that includes multiple link identification information fields.
  • the link identification information field may indicate the corresponding relationship between a link identification and a station operating on the link corresponding to the link identification.
  • the link identification information field includes not only the link identification, but also one or more of the following information: media access control (Media Access Control, MAC) address, operation set, and channel number. Among them, one or more of the MAC address, operation set, and channel number can indicate a link.
  • the MAC address of the AP is also the BSSID (basic service set identifier) of the AP.
  • the AP MLD and the STA multi-link device negotiate multiple link identification information fields.
  • multi-link device association means that one AP of AP MLD is associated with one STA of STA MLD. This association can help multiple STAs of STA MLD to associate with multiple APs of AP MLD respectively.
  • one STA is associated with An AP.
  • the AP MLD or STA multi-link device will use the link identifier to represent a site/AP in the STA multi-link device.
  • the link identifier can also represent the MAC address of the AP working on the link. , the working operation set, one or more attributes in the channel number, for example, the link identification represents ⁇ operation set, channel number, AP's MAC address>, where the AP's MAC address is equivalent to the AP's BSSID (basic service set identifier, basic service set identifier).
  • WLAN scenarios such as the IEEE 802.11 system standard.
  • systems that support IEEE 802.11ax next-generation Wi-Fi protocols, 802.11be, Wi-Fi 7 or EHT, and wireless LAN systems based on 802.11 series protocols such as 802.11be next-generation, Wi-Fi 8, etc. can also be applied to Ultra-bandwidth UWB wireless personal area network system, sensing system.
  • BSS is used to describe a group of devices that can communicate with each other in WLAN. Multiple BSSs can be included in a WLAN. Each BSS has a unique identifier called a Basic Service Set Identifier (BSSID).
  • BSSID Basic Service Set Identifier
  • a BSS can include multiple stations (STAs).
  • the site can be an AP or non-AP STA.
  • a BSS can contain one AP and multiple non-AP STAs associated with the AP.
  • Figure 2 is a schematic structural diagram of a communication system provided by an embodiment of the present application.
  • (a) of Figure 2 takes a wireless local area network as an example to introduce a communication system 100 applied in the embodiment of the present application.
  • Figure 2 (b) and Figure 2 (c) take the communication between a multi-link device and other devices through multiple links in a wireless local area network as an example, and respectively show the schematic structural diagrams of the communication system 200 and the communication system 300.
  • the communication system 100 includes a station 101 and a station 102 .
  • site 101 can use multiple links to communicate with site 102, thereby achieving the effect of improving throughput.
  • the site 101 may be a multi-link device, and the site 102 may be a single-link device or a multi-link device, etc.
  • site 101 is an AP MLD
  • site 102 is a STA MLD or site (such as a single-link site).
  • site 101 is a STA MLD
  • site 102 is an AP (such as a single-link AP) or AP MLD.
  • site 101 is AP MLD, and site 102 is AP MLD or AP; in another scenario, site 101 is STA MLD, and site 102 is STA MLD or STA (such as a single-link site).
  • the wireless LAN may also include other devices. The number and type of devices illustrated in (a) of Figure 2 are only exemplary.
  • the communication system 200 includes an AP MLD 201 and a STA MLD 202.
  • AP MLD 201 includes affiliated AP1 and AP2
  • STA MLD 202 includes affiliated STA1 and STA2
  • AP MLD 2021 and STA MLD 202 use link 1 and link 2 to communicate in parallel.
  • the communication system 300 includes AP MLD301, STA MLD302, STA MLD303 and STA304.
  • (c) of Figure 2 shows a scenario in which AP MLD301 communicates with STA MLD302, STA MLD303 and STA304.
  • AP MLD301 includes affiliated AP1, AP2 and AP3.
  • STA MLD302 includes three affiliated sites, STA1, STA2 and STA3.
  • STA MLD303 includes 2 affiliated sites, STA4 and STA5.
  • STA304 is a single-link device.
  • AP MLD301 can use link 1, link 2 and link 3 to communicate with STA MLD302, use link 2 and link 3 to communicate with STA MLD303, and use link 1 to communicate with STA304.
  • STA304 works in the 2.4GHz band
  • STA MLD303 STA4 works in the 5GHz band
  • STA5 works in the 6GHz band
  • STA MLD302 STA1 works in the 2.4GHz frequency band
  • STA2 works in the 5GHz frequency band
  • STA3 works in the 6GHz frequency band
  • AP1 in AP MLD301 working in the 2.4GHz frequency band can transmit uplink or downlink data through link 1 to STA304 and STA1 in STA MLD302.
  • AP2 in AP MLD301 working in the 5GHz band can transmit uplink or downlink data through link 2 and STA4 working in the 5GHz band in STA MLD 303, and can also communicate with STA2 working in the 5GHz band in STA MLD302 through link 2. transmit uplink or downlink data between them.
  • AP3 working in the 6GHz band in AP MLD301 can transmit uplink or downlink data through link 3 and STA3 working in the 6GHz band in STA MLD302, and can also transmit uplink or downlink data between link 3 and STA5 in STA MLD. data.
  • AP MLD301 can work on one or more links in link 1, link 2 or link 3 as an example.
  • link On the AP side or STA side, the link here can also be understood as the station working on the link.
  • AP MLD and STA MLD can also support more or fewer frequency bands, that is, AP MLD and STA MLD can work on more links or fewer links. This is not the case in the embodiments of this application. Make restrictions.
  • STA includes two working modes, one is non-energy-saving mode and the other is energy-saving mode.
  • the STA When the STA is working in a non-energy-saving mode, the STA is always awake regardless of whether there is data transmission on the STA, which is the active mode.
  • the STA When the STA is working in energy-saving mode, the STA can be in the awake state (awake state) when transmitting data with the AP; when there is no data transmission with the AP, the STA can be in the sleep state (doze state) to save power consumption.
  • a STA can indicate whether the STA is in power-saving mode by sending a frame to the AP.
  • the energy-saving bit in the frame control field in the MAC header of the frame is set to 1 to indicate to the AP that the STA is in energy-saving mode.
  • the frame control field in the MAC header of the frame ) in the energy-saving bit is set to 0 to indicate to the AP that the STA is in non-energy-saving mode.
  • data transmission and “transmitting data” mentioned in this application generally refer to communications
  • data generally refers to communication information, and is not limited to data information, and can also be signaling information, etc.
  • the STA can communicate with the AP for a wake-up period.
  • the AP sends a broadcast traffic indication map (TIM) frame at the beginning of each wake-up period.
  • TIM broadcast traffic indication map
  • the TIM frame is much shorter than the beacon frame.
  • the TIM element included in the TIM frame is used to inform multiple STAs whether there are corresponding downlink service indications. Since TIM frames are much shorter than beacon frames, STA can achieve energy saving effects.
  • the TIM broadcast interval (TIM broadcast interval) field of the TIM broadcast request (broadcast request) frame sent by the STA or the TIM broadcast response (broadcast response) frame replied by the AP is used to indicate the wake-up period.
  • the TIM broadcast interval is usually set larger than the beacon frame interval.
  • Figure 3 shows a schematic frame structure diagram of a TIM frame provided by an embodiment of the present application.
  • the TIM frame shown in Figure 3 can be applied to non-multilink sites.
  • the frame carrier in the TIM frame may include at least one of the following: type field, unprotected wireless network management (WNM) behavior field, beacon check field, timestamp field, TIM element, etc.
  • the timestamp field is used to indicate clock information
  • the beacon check (check beacon) field is used to indicate whether the BSS where the site is located has updated key BSS parameters
  • the TIM element is used to inform the site whether there is downlink unicast/multicast service.
  • the value of the beacon check field is increased, for example, by 1. For example, when the AP determines that the BSS has updated key BSS parameters, it increases the beacon check field value by 1, where the initial value of the beacon check field is 0. STA will record the value of the received beacon check field every time. If the value of the beacon check field in the most recently received service is different from the value of the beacon check field received last time, the STA will receive the beacon frame sent by the AP.
  • Figure 3 shows the TIM frame applicable to a single-link site. This solution does not consider the TIM broadcast mechanism in the case of multi-link devices. As a result, one site in the multi-link device of the site cannot obtain multiple AP multi-link devices. Update information on whether the AP or the multiple BSSs it manages are critical BSS parameters.
  • FIG. 4 and Figure 5 show TIM frames in multi-link device communication scenarios.
  • TIM frames can also be called multi-link TIM frames.
  • the multi-link TIM frames also include unprotected WNM.
  • Behavior field among which, the behavior value of the unprotected WNM behavior field is shown in Table 1.
  • the behavior value is set to one of the reserved values, such as 2, which can be used to indicate that the TIM frame is a multi-link TIM frame, thereby distinguishing the multi-link TIM frame from that shown in Figure 3 distinguished from traditional TIM frames.
  • the embodiment of the present application does not limit the specific value of a reserved value of the unprotected WNM behavior field. For example, it can also be other values in 2-255. This is only an exemplary description.
  • Figure 4 shows a schematic frame structure diagram of a TIM frame provided by an embodiment of the present application.
  • the TIM frame shown in Figure 4 can be applied to multi-link communication scenarios.
  • the frame carrier includes type, unprotected WNM behavior field, Beacon check field, TIM element field, and link identification information field.
  • a timestamp field can also be included.
  • the beacon frame check field of the multi-link TIM frame shown in Figure 4 is used to indicate whether the link indicated by the link identification information field has updated key BSS parameters.
  • the TIM element is used to indicate the site multi-link device/site. Whether there is downlink unicast/multicast service information.
  • FIG. 5 shows a schematic frame structure diagram of a TIM frame provided by an embodiment of the present application.
  • the TIM frame shown in Figure 5 can be applied to multi-link communication scenarios.
  • the frame carrier includes not only the type and unprotected WNM behavior fields, but also the link number field.
  • the link number field When the number of links indicated by the number of links field is multiple, for each link, a Beacon check field, a TIM element field, and a link identification information field are also included.
  • a timestamp field or multiple timestamp fields can also be included.
  • each beacon check field corresponds to a link identification information field, which is used to indicate whether the link where the link identification information field is located has key BSS parameter update information.
  • the value of the Beacon check field increases, for example, by 1.
  • the first AP determines that the BSS on a certain link has updated key BSS parameters, it increases the Beacon check field value corresponding to the link by 1.
  • the above BSS parameters can also be understood as link parameters.
  • a multi-link STA will record the received Beacon check field value corresponding to each link every time. If the value of the Beacon check field corresponding to a link in the recently received service is different from the value of the Beacon check field corresponding to the link last received, the multi-link STA will receive messages from multiple links on the link. Beacon frame sent by the link AP.
  • this site can receive TIM frames within the specified time interval and obtain the information corresponding to the AP associated with the site. Updated information on key BSS parameters. However, the site is unable to obtain updated information on key BSS parameters corresponding to APs associated with other sites of the multi-link device, resulting in the site's multi-link device or the site being unable to communicate normally with these APs.
  • embodiments of the present application provide a communication method, which helps to improve the reliability of communication.
  • Figure 6 is a schematic diagram of a communication method provided by an embodiment of the present application. As shown in Figure 6, the method 600 includes the following steps.
  • the first AP of the first AP MLD generates first information.
  • the first information is used to indicate whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed.
  • a WLAN may include multiple BSSs, and each BSS may include an AP and multiple STAs associated with the AP. That is, each AP corresponds to a BSS.
  • the key BSS parameters are important parameters used to describe the BSS. Therefore, there is also a one-to-one correspondence between the AP and the key BSS parameters.
  • the key BSS parameters corresponding to the AP can also be understood as the key BSS parameters of the BSS where the AP is located, or the key BSS parameters of the AP.
  • the key BSS parameters corresponding to the AP can also be understood as the key BSS parameters of the BSS where the link corresponding to the AP is located.
  • the first information is used to indicate whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed. It can also be said that the first information is used to indicate the key BSS corresponding to any AP in the first AP MLD. Whether the parameters have changed, or in other words, the first information is used to indicate whether the key BSS parameters corresponding to all APs in the first AP MLD have changed, or in other words, the first information is used to indicate whether the key BSS parameters corresponding to all APs in the first AP MLD have changed. Whether the key BSS parameters corresponding to each AP have changed.
  • the AP whose key BSS parameters change in the first AP MLD may be one or multiple. There can be one or multiple key BSS parameter change events in an AP.
  • the first information may only indicate whether there is a change in the key BSS parameters of the AP in the first AP MLD, but does not indicate which APs in the first AP MLD have changes in the key BSS parameters.
  • the first AP of the first AP MLD generates first information, the first information is used to indicate whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed, which can be understood as, in the first AP MLD
  • the first AP When the key BSS parameter corresponding to at least one AP changes, the first AP generates first information, and the first information is used to indicate that the key BSS parameter corresponding to at least one AP in the MLD of the first AP changes.
  • the first AP when the key BSS parameters corresponding to all APs in the first AP have not changed, the first AP generates the first information, and the first information is used to indicate to the first AP that the key BSS parameters corresponding to all APs in the MLD have not changed. changes occur.
  • the key BSS parameters change, it can also be said that the key BSS parameters are updated, or the key BSS parameters are updated.
  • the AP whose key BSS parameters change can be the first AP, or any AP in the first AP MLD except the first AP, or multiple APs in the first AP MLD, whichever is more.
  • the first AP may or may not include the first AP.
  • the key BSS parameter change event can be used to identify whether the key BSS parameter changes. If the key BSS parameter changes, it can be understood that there is a key BSS parameter change event in the beacon frame.
  • the key BSS parameter change event includes at least one of the following: including a channel change notification element (Inclusion of a Channel Switch Announcement element), including an extended channel change notification element (Inclusion of an Extended Channel Switch Announcement element), Modification of the EDCA parameters element, Inclusion of a Quiet element, Modification of direct sequence spread spectrum (DSSS) Modification of the DSSS Parameter Set, modification of contention free (CF) parameter set element (Modification of the CF Parameter Set element), modification of high throughput (high throughput, HT) operation element (Modification of the HT) Operation element), Inclusion of a Wide Bandwidth Channel Switch element, Inclusion of a Channel Switch Wrapper element, Inclusion of an Operating mode notification element Mode Notification element), including static channel element (Inclusion of a Quiet Channel element), modification of VHT (very high throughput) operation element (Modification of the VHT Operation element), modification of HE (high efficient) operation element (Modification of the HE Operation element), Insertion of a Broadcast
  • any AP can obtain whether the values of key BSS parameters of all APs to which the AP MLD is affiliated have changed.
  • the first AP is an AP that establishes the TIM broadcast service for at least one of its associated sites.
  • the site belongs to the site MLD.
  • the first AP sends the first information to the first STA in the first STA MLD, and accordingly, the first STA in the first STA MLD receives the first information.
  • the first STA MLD and the first AP MLD are communication devices in a multi-link communication scenario.
  • the first AP is any AP affiliated to the first STA MLD
  • the first SAT is an STA affiliated to the first STA MLD.
  • the first STA is associated with the first AP, that is, there is a communication link between the first AP and the first STA.
  • the first AP sends the first information to the first STA in the first STA MLD. It can also be said that the first AP sends the first information on the link on which it works.
  • the first STA in the first STA MLD receives the first information. It can also be said that the first STA receives the first information on the link on which it works.
  • the first site is a site that establishes a TIM broadcast service with its associated AP.
  • the AP belongs to the AP MLD.
  • the first AP can indicate to the first STA MLD whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed through the first information. Further, the first STA can determine whether to obtain the third STA according to the first information.
  • the key BSS parameters of the AP of an AP MLD In this way, when the key BSS parameters corresponding to at least one AP in the first AP MLD change, the first STA can learn in time, so that the first STA MLD and the first AP MLD can communicate normally, which helps to improve communication reliability.
  • the method further includes: S630, the first STA determines whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed according to the first information.
  • the first information may be a displayed indication, that is, after parsing the first information, the first STA can obtain whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed.
  • the first information is a count value.
  • the key BSS parameters corresponding to one or more APs in the first AP MLD change, the value of the first information increases. If the key BSS parameters corresponding to all APs in the first AP MLD have not changed, the value of the first information remains unchanged.
  • the first information can also be an implicit indication. That is, after the first STA parses the first information, it can further obtain whether the key BSS parameter corresponding to at least one AP in the first AP MLD occurs based on the internal judgment logic. Variety.
  • the first information is a bit value.
  • 1 bit reserved in the unprotected WNM behavior field can be used as the first information.
  • the value of this 1 bit is 1, it means that the key BSS parameters corresponding to one or more APs in the first AP MLD have changed.
  • the value of this 1 bit is 0, it means that all the APs in the first AP MLD have changed. None of the key BSS parameters corresponding to the AP have changed.
  • the first STA may determine whether to obtain the key BSS parameters of the AP of the first AP MLD based on the first information. For example, if the key BSS parameter corresponding to at least one AP in the first AP MLD changes, the key BSS parameter of the changed AP is obtained.
  • the first information is a count value.
  • the key BSS parameter corresponding to at least one AP in the first AP MLD changes, the value of the first information increases.
  • the first AP may send the second information to the first STA in the first STA MLD, and accordingly, the first STA in the first STA MLD receives the second information, where the second information is the
  • the information sent by an AP before sending the first information is used to indicate whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed.
  • the value of the first information has increased, which can be understood as the value of the first information has increased compared with the value of the second information.
  • the value of the first information does not increase, which can be understood as the value of the first information is equal to the value of the second information, or the value of the first information remains unchanged compared to the value of the fifth information.
  • the value of the second information is 0. If before sending the first information, if there is a key BSS parameter corresponding to an AP in the first AP MLD that changes, then the value of the first information is 1.
  • the value of the second information is 0. If before sending the first information, if multiple key BSS parameters corresponding to an AP in the first AP MLD change, then the value of the first information is 1.
  • the value of the second information is 0. If before sending the first information, if the key BSS parameters corresponding to multiple APs in the first AP's MLD change, regardless of the specific number of the multiple APs, , and no matter how many key BSS parameters of an AP change, the value of the first information is increased by 1.
  • the value of the first information remains unchanged, which can be understood as the value of the first information remains unchanged compared to the value of the second information.
  • the method 600 further includes: the first STA records (maintains) the first information.
  • recording can also mean preserving, maintaining, and storing.
  • the first STA will record the value of the received first information.
  • the first STA when the value of the first information changes, the first STA records the value of the first information. That is, the first STA determines whether to update the value of the first information based on whether the value of the first information changes.
  • the first STA After the first STA receives the first information, regardless of whether the value of the first information is the same as the previously recorded value, the first STA records the first information received this time and discards the previously recorded value. .
  • the information recorded before the first STA records the first information is called second information.
  • the second information is received before receiving the first information and is used to indicate that the first AP corresponds to at least one AP in the MLD.
  • the first STA may compare the first information with the first information, thereby determining at least one AP in the first AP MLD based on whether the value of the first information and the value of the second information are the same. Whether the corresponding key BSS parameters have changed.
  • the value of the first information and the value of the second information are different.
  • the first STA determines that the key BSS parameter corresponding to at least one AP in the first AP MLD has changed.
  • the first STA MLD can further obtain the key BSS parameters corresponding to the AP associated with the second STA in either of the following two ways, where the second STA is the same as the first AP in the first STA MLD.
  • MLD establishes associated sites.
  • the second STA is all sites in the first STA MLD that are associated with the first AP MLD.
  • the first STA MLD includes three subordinate STAs, denoted as STA#1, STA#2, and STA#3.
  • STA#1, STA#2, and STA#3 are associated with the first AP MLD. site, at this time the second STA is STA#1, STA#2 and STA#3.
  • the second STA of the first STA MLD receives a beacon frame.
  • the beacon frame includes key BSS parameters corresponding to the AP associated with the second STA.
  • the first information received by the first STA will trigger the second STA to receive a beacon frame, where triggering can also be said to enable or enable.
  • triggering can be understood as information interaction between the first STA and the second STA. For example, if the second STA is in the sleep state, the second STA can transition to the awake state, so that the second STA can also change from the sleep state to the awake state.
  • An STA obtains information on changes in key BSS parameters corresponding to at least one AP in the first AP MLD. Triggering can also be understood as the internal processing process of the first STA MLD.
  • the first STA MLD For the first STA MLD, if the first STA determines that the key BSS parameter corresponding to at least one AP in the first AP MLD changes, then the first STA MLD All STAs obtain information about changes in key BSS parameters corresponding to the AP associated with them in the first AP MLD.
  • the first STA determines that the key BSS parameter corresponding to at least one AP in the first AP MLD has changed, then all second STAs in the first STA MLD will receive the beacon frame.
  • both the first STA and the second STA can receive the beacon frame, thereby obtaining the key BSS of the AP associated with the STA. Parameters, in this way, the second STA in the first STA MLD can also obtain the key BSS parameters of the BSS where it is located, which helps to improve the communication reliability of the second STA.
  • Method 2 The first STA sends the first frame to the first AP.
  • the first frame is used to request key BSS parameters corresponding to the AP associated with the second STA.
  • the first AP may send a second frame to the first STA, where the second frame includes key BSS parameters corresponding to the AP associated with the second STA.
  • the AP associated with STA#1 is marked as AP#1
  • the AP associated with STA#2 is marked as AP#2
  • the AP associated with the second STA here refers to The ones are AP#1 and AP#2.
  • STA#1 determines that the key BSS parameters corresponding to at least one AP in the first AP MLD have changed, then STA#1 can send a multi-link detection request frame.
  • the multi-link detection request frame is used to request the BSS corresponding to AP#1.
  • the first STA determines that the key BSS parameters corresponding to at least one AP in the first AP MLD have changed, then the first STA can obtain the AP corresponding to all sites in the first STA MLD associated with the first AP MLD. Key BSS parameters.
  • the first frame may be a multi-link probe request frame.
  • the multi-link detection request frame may include link identifiers corresponding to the requested one or more APs.
  • the multi-link detection request frame includes the MLD identifier of the first AP MLD to which the one or more APs belong.
  • the one or more APs are APs associated with all sites of the first STA MLD.
  • the link identification corresponding to each AP is located in the site summary field (per STA profile) of the multi-link element, and the MLD identification of the first AP MLD is located in the public information field of the multi-link element.
  • the second frame may be a multi-link detection response frame.
  • the multi-link detection response frame may include the link identifier corresponding to the requested one or more APs.
  • the multi-link detection response frame includes the MLD identifier of the first AP MLD to which the one or more APs belong.
  • the one or more APs are APs associated with all sites of the first STA MLD.
  • each corresponding AP is located in the site summary subelement field (per STA profile subelement) of the multi-link element
  • the MLD identification of the first AP MLD is located in the public information field of the multi-link element
  • Each site summary sub-element field includes element information of an AP.
  • each site summary sub-element field may include information about changed key BSS parameters, that is, it includes corresponding elements. For example, if a key BSS parameter change event includes an Inclusion of a Channel Switch Announcement element, the corresponding element is a Channel Switch Announcement element.
  • the first STA determines that the key BSS parameters corresponding to at least one AP in the first AP MLD have changed, the first STA can also obtain the key BSS parameters of the AP associated with the second STA through the first frame and the second frame. , helping to improve the communication reliability of the first STA MLD.
  • the second STA is a station working on a link in the enable state.
  • the value of the first information and the value of the second information are the same.
  • the first STA determines that the key BSS parameters corresponding to all APs in the first AP MLD have not changed.
  • the number of first pieces of information is one.
  • the first information is carried in a beacon check field.
  • the value of the beacon check field may be used to indicate whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed.
  • the number of beacon check fields is one.
  • the first information is carried in a TIM frame.
  • the TIM frame can be multiplexed, and the first information, for example, including 1 byte, is carried through the beacon check field in the TIM frame.
  • the structure of the TIM frame can be shown in Figure 3.
  • the embodiment of the present application can be compatible with non-multi-link sites, so that non-multi-link sites can also correctly parse TIM frames, thereby obtaining that the key BSS parameters corresponding to all APs in the first AP MLD have not changed.
  • the initial value of the first information in the first AP is 0.
  • the first information in the first AP MLD may be initialized to 0.
  • the initial value of the first information of the STA in the first STA MLD is 0.
  • the first information in the first STA MLD may be initialized to 0.
  • the initial value of the first information in the first STA MLD is a value provided by the AP, which may also be called an initial value.
  • the first AP may provide the value of the first information to the first STA in an association response frame.
  • the first AP may provide the value of the first information to the first STA in a TIM broadcast response frame.
  • the method 600 of the embodiment of the present application will be described in detail below, taking the communication system 300 shown in 2(c) as an example.
  • AP2 an example of the first AP
  • STA2 an example of the first STA MLD
  • STA MLD302 an example of the first STA MLD
  • the initial value of the beacon check field of an STA is 0.
  • STA2 is the site of the TIM broadcast service established by its associated AP2.
  • STA1 and STA3 are in sleep state.
  • AP2 can increase the value of the beacon check field by 1. For example, AP2 generates frame #1, and the value of the beacon check field in frame #1 is The value is 1 (an example of first information).
  • AP2 sends frame #1 to STA2 through link 2, and STA2 receives frame #1.
  • STA2 determines that the key BSS parameter of at least one AP in AP MLD301 has changed based on the value of the beacon check field in frame #1 (1) and the value of the beacon check field of the previous record (0).
  • Method 1 STA2 receives the beacon frame from AP2 through link 2.
  • the beacon frame includes the key BSS parameters corresponding to AP2.
  • STA1 and STA3 enter the awake state.
  • STA1 receives the beacon frame from AP1 through link 1.
  • the beacon frame includes the key BSS parameters corresponding to AP1.
  • STA3 receives the beacon frame from AP3 through link 3.
  • the beacon frame includes the key BSS parameters corresponding to AP3.
  • Method 2 STA 2 sends the first frame to AP2 through link 2.
  • This first frame is used to request the key BSS parameters of AP1 associated with STA1, the key BSS parameters of AP2 associated with STA2, and the key BSS parameters of AP3 associated with STA3.
  • AP2 sends a second frame to STA2 through link 2.
  • the second frame includes the key BSS parameters of AP1, the key BSS parameters of AP2, and the key BSS parameters of AP3.
  • the first frame is a multi-link detection request frame
  • the second frame is a multi-link detection response frame.
  • the first AP can indicate to the first STA MLD whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed through the first information. Further, the first STA can determine whether to obtain the third STA according to the first information.
  • the key BSS parameters of the AP of an AP MLD In this way, when the key BSS parameters corresponding to at least one AP in the first AP MLD change, the first STA can learn in time, so that the first STA MLD and the first AP MLD can communicate normally, which helps to improve communication reliability.
  • FIG. 7 is a schematic block diagram of a communication device provided by an embodiment of the present application.
  • the device 400 may include a transceiver unit 410 and a processing unit 420 .
  • the transceiver unit 410 can communicate with the outside, and the processing unit 420 is used for data processing.
  • the transceiver unit 410 may also be called a communication interface or a communication unit.
  • the device 400 may be the first AP MLD device in the above method embodiment, or may be a chip used to implement the functions of the first AP MLD device in the above method embodiment.
  • the device 400 may be the first AP of the above-mentioned first AP MLD, or may be a chip used to implement the functions of the first AP of the above-mentioned first AP MLD.
  • the device includes: a processing unit 420, configured to generate first information, the first information being used to indicate whether a key BSS parameter corresponding to at least one AP in the device has changed; a transceiver unit 410, configured to send a message to the first STA MLD sends the first message.
  • the first information is a count value.
  • the value of the first information increases.
  • the value of the first information remains unchanged.
  • the first information is carried in a beacon check field.
  • the beacon check field is carried in the traffic indication bitmap TIM frame.
  • the first information is used to indicate that the key BSS parameter corresponding to at least one AP in the device has changed
  • the transceiver unit 410 is also used to: receive the first frame from the first STA, the first frame is used to request The key BSS parameters corresponding to the AP associated with the second STA, which is the station associated with the device in the MLD of the first STA; send a second frame to the first STA, the second frame including the AP associated with the second STA Corresponding key BSS parameters.
  • the second STA is all STAs in the MLD of the first STA.
  • the key BSS parameters include one or more of the following: including channel change notification elements, including extended channel change notification elements, changing enhanced distributed channel access EDCA parameter elements, including static elements, modifying direct sequence spread spectrum DSSS Parameter set, modify contention-free CF parameter set element, modify high throughput HT operation element, include wide bandwidth channel change element, include wide bandwidth channel change envelope element, include operating mode notification element, include static channel element, modify very high Throughput VHT operation elements, modify efficient HE operation elements, insert broadcast TWT elements, including BSS color change notification elements, modify multi-user EDCA parameter set elements, modify spatial multiplexing parameter set elements, modify extremely high throughput operation elements.
  • the above-mentioned transceiver unit 410 can be divided into a receiving unit and a sending unit, wherein the receiving unit is used to perform operations related to the reception of the first AP MLD in the above method embodiment, and the sending unit is used to perform the above method implementation.
  • the first AP MLD sends related operations.
  • the above content is only taken as an example, and the device 400 can also implement other steps, actions or methods related to the first AP MLD in the above method embodiment, which will not be described again.
  • the device 400 may be the first STA MLD device in the above method embodiment, or may be a chip used to implement the functions of the first STA MLD device in the above method embodiment.
  • the device 400 may be the first STA and/or the second STA of the first STAMLD, or may be a chip used to implement the functions of the first STA and/or the second STA of the first STAMLD.
  • the device may include: a transceiver unit 410, configured to receive first information, the first information being used to indicate whether a key BSS parameter corresponding to at least one AP in the first AP MLD has changed; a processing unit 420, configured to Determine whether the key BSS parameter corresponding to at least one AP in the first AP MLD changes according to the first information.
  • a transceiver unit 410 configured to receive first information, the first information being used to indicate whether a key BSS parameter corresponding to at least one AP in the first AP MLD has changed
  • a processing unit 420 configured to Determine whether the key BSS parameter corresponding to at least one AP in the first AP MLD changes according to the first information.
  • the first information is a count value.
  • processing unit 420 is also configured to: record the first information.
  • the processing unit 420 is specifically configured to: determine whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed according to whether the value of the first information and the value of the second information are the same, wherein the first AP MLD
  • the second information is the information received last time the device received the first information, and the second information is used to indicate whether the key BSS parameter corresponding to at least one AP in the first AP MLD has changed.
  • the processing unit 420 is specifically configured to: if the value of the first information and the value of the second information are the same, determine that the key BSS parameters corresponding to all APs in the first AP MLD have not changed; and/or , if the value of the first information and the value of the second information are different, it is determined that the key BSS parameter corresponding to at least one AP in the first AP MLD has changed.
  • the value of the first information is different from the value of the second information.
  • the device further includes: a first transceiver unit, configured to receive a beacon frame, where the beacon frame includes the value corresponding to the AP associated with the second STA. Key BSS parameters, the second STA is the station associated with the first AP MLD in the device.
  • the transceiver unit 410 is further configured to: send a first frame, the first frame is used to request the key BSS parameters corresponding to the AP associated with the second STA.
  • the second STA is a station associated with the first AP MLD in the device; receives a second frame, and the second frame includes key BSS parameters corresponding to the AP associated with the second STA.
  • the second STA is all STAs in the device.
  • the first information is carried in a beacon check field.
  • the beacon check field is carried in a service indication bitmap TIM frame.
  • the key BSS parameters include one or more of the following: including channel change notification elements, including extended channel change notification elements, changing EDCA parameter elements, including static elements, modifying DSSS parameter set, modifying CF parameter set elements, modifying HT operation elements, including wide bandwidth channel change elements, including wide bandwidth channel change envelope elements, including operation mode notification elements, including static channel elements, modifying VHT operation elements, modifying HE operation elements, inserting broadcast TWT elements, including BSS colors Change notification element, modify multi-user EDCA parameter set element, modify spatial multiplexing parameter set element, modify extremely high throughput operation element.
  • the above-mentioned transceiver unit 410 can be divided into a receiving unit and a sending unit, wherein the receiving unit is used to perform operations related to the reception of the first STA MLD in the above method embodiment, and the sending unit is used to perform the above method implementation.
  • the first STA MLD is sent related operations.
  • the device 400 here is embodied in the form of a functional unit.
  • the term "unit” as used herein may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a proprietary processor, or a group of processors) used to execute one or more software or firmware programs. processor, etc.) and memory, merged logic circuitry, and/or other suitable components to support the described functionality.
  • ASIC application specific integrated circuit
  • processor such as a shared processor, a proprietary processor, or a group of processors
  • memory merged logic circuitry, and/or other suitable components to support the described functionality.
  • the device 400 can also implement other steps, actions or methods related to the first STA MLD in the above method embodiment, which will not be described again here.
  • FIG 8 is a schematic block diagram of a communication device 500 provided by an embodiment of the present application.
  • the communication device 500 includes: at least one processor 510 and a transceiver 520.
  • the processor 510 is coupled to the memory and is used to execute instructions stored in the memory to control the transceiver 520 to send signals and/or receive signals.
  • the communication device 500 further includes a memory 530 for storing instructions.
  • processor 510 and the memory 530 can be combined into one processing device, and the processor 510 is used to execute the program code stored in the memory 530 to implement the above functions.
  • the memory 530 may also be integrated in the processor 510 or independent of the processor 510 .
  • the transceiver 520 may include a receiver and a transmitter.
  • the transceiver 520 may further include an antenna, and the number of antennas may be one or more.
  • the transceiver 1020 may be a communication interface or an interface circuit.
  • the chip When the communication device 500 is a chip, the chip includes a transceiver unit and a processing unit.
  • the transceiver unit may be an input-output circuit or a communication interface;
  • the processing unit may be a processor, microprocessor, or integrated circuit integrated on the chip.
  • An embodiment of the present application also provides a processing device, including a processor and an interface.
  • the processor may be used to execute the method in the above method embodiment.
  • the above processing device may be a chip.
  • the processing device may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or a system on chip (SoC), or It can be a central processing unit (CPU), a network processor (NP), a digital signal processing circuit (DSP), or a microcontroller unit , MCU), it can also be a programmable logic device (PLD) or other integrated chip.
  • FPGA field programmable gate array
  • ASIC application specific integrated circuit
  • SoC system on chip
  • CPU central processing unit
  • NP network processor
  • DSP digital signal processing circuit
  • MCU microcontroller unit
  • PLD programmable logic device
  • each step of the above method can be completed by instructions in the form of hardware integrated logic circuits or software in the processor.
  • the steps of the methods disclosed in conjunction with the embodiments of the present application can be directly implemented by a hardware processor for execution, or can be executed by a combination of hardware and software modules in the processor.
  • the software module can be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other mature storage media in this field.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • Embodiments of the present application also provide a computer-readable storage medium on which are stored computer instructions for implementing the method executed by the first AP MLD or the first STA MLD in the above method embodiment.
  • Embodiments of the present application also provide a computer program product containing instructions.
  • the instructions When the instructions are executed by a computer, the computer implements the method executed by the first AP MLD or the first STA MLD in the above method embodiment.
  • This application also provides a system, which includes the aforementioned first AP MLD or first STA MLD.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another, e.g., the computer instructions may be transferred from a website, computer, server, or data center To another party through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) A website site, computer, server or data center for transmission.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more available media integrated.
  • the available media may be magnetic media (eg, floppy disk, hard disk, tape), optical media (eg, high-density digital video disc (DVD)), or semiconductor media (eg, solid state disk, SSD)) etc.
  • an embodiment means that a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present application. Therefore, various embodiments are not necessarily referred to the same embodiment throughout this specification. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.
  • the size of the sequence numbers of the above-mentioned processes does not mean the order of execution.
  • the execution order of each process should be determined by its functions and internal logic, and should not be used in the embodiments of the present application.
  • the implementation process constitutes any limitation.
  • the names of all nodes and messages in this application are only the names set by this application for the convenience of description.
  • the names in the actual network may be different. It should not be understood that this application limits the names of various nodes and messages. On the contrary, any names with and The names of nodes or messages with the same or similar functions used in this application are regarded as methods or equivalent replacements in this application, and are all within the protection scope of this application.
  • preset can be achieved by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in the device (for example, terminal device).
  • this application does not limit its specific implementation, such as preset rules, preset constants, etc. in the embodiments of this application.
  • system and “network” are often used interchangeably herein.
  • network and/or in this article is just an association relationship that describes related objects, indicating that three relationships can exist. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and they exist alone. B these three situations.
  • At least one of! or "at least one of" herein refers to all or any combination of the listed items, for example, "at least one of A, B and C", It can mean: A exists alone, B exists alone, C exists alone, A and B exist simultaneously, B and C exist simultaneously, and A, B and C exist simultaneously. "At least one” in this article means one or more. "Multiple" means two or more.
  • B corresponding to A means that B is associated with A, and B can be determined based on A.
  • determining B based on A does not mean determining B only based on A.
  • B can also be determined based on A and/or other information.
  • the terms “including,” “includes,” “having,” and variations thereof all mean “including but not limited to,” unless otherwise specifically emphasized.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit.
  • the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code. .

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Abstract

本申请涉及通信领域，尤其涉及一种适用于多链路设备的通信方法和装置，该方案可以应用于支持IEEE 802.11ax下一代Wi-Fi协议，如802.11be，Wi-Fi 7或EHT，再如802.11be下一代，Wi-Fi 8等802.11系列协议的无线局域网系统，还可以应用于基于超带宽UWB的无线个人局域网系统、感知sensing系统。该方法包括：第一AP向第一STA MLD发送第一信息，该第一信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化，如此，当第一AP MLD中至少一个AP对应的关键BSS参数发生变化时，第一STA能够及时获知，有助于提高通信的可靠性。

Description

一种通信的方法和装置
本申请要求申请日为2022年4月11日、申请号为202210376192.0、申请名称为“一种通信的方法和装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信领域，更具体地，涉及一种通信的方法和装置。
背景技术
为了大幅提升无线局域网(wireless local area network，WLAN)系统的业务传输速率，电气和电子工程师协会(Institute of Electrical and Electronics Engineers，IEEE)802.11ax标准在现有正交频分复用(orthogonal frequency division multiplexing，OFDM)技术的基础上，进一步采用正交频分多址(orthogonal frequency division multiple access，OFDMA)技术。OFDMA技术支持多个节点同时发送和接收数据，从而实现多站点分集增益。
下一代WiFi标准IEEE 802.11be被称为极高吞吐率(extremely high throughput，EHT)或Wi-Fi 7，其最重要的技术目标是显著提升峰值吞吐率。IEEE 802.11be标准的WLAN设备支持通过多个流数(最大空间流数为16)、多个频段(例如，2.4GHz，5GHz和6GHz频段)，以及同一频段上通过多个信道的合作等方式提高峰值吞吐率，降低业务传输的时延。该多频段或多信道可以统称为多链路。同时支持多条链路的下一代IEEE 802.11标准站设备称为多链路设备(multi-link device，MLD)。
业务指示位图(traffic indication map，TIM)广播(broadcast)特性是指站点(station，STA)或站点多链路设备可以在指定的时间间隔内接收TIM帧，获得该站点或站点多链路设备关联的接入点(access point，AP)的关键基本服务集(基本服务集(basic service set，BSS)参数的更新信息。然而现有技术中站点多链路设备获得关键BSS参数的更新信息的方式会影响通信的可靠性。
发明内容
本申请实施例提供一种通信的方法和装置，能够提高通信的可靠性。
第一方面，提供了一种通信方法，应用于第一接入点多链路设备(access point multi-link device，AP MLD)中，该方法可以由第一AP MLD执行，或者，也可以由配置于第一AP MLD中的芯片或电路执行，本申请对此不作限定。以下以由第一AP MLD执行为例进行说明。
该方法可以包括：第一AP MLD的第一AP生成第一信息，该第一信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化；第一AP向第一站点多链路设备(stationmulti-link device，STA MLD)发送该第一信息。
基于上述方案，第一AP可以通过第一信息向第一STA MLD指示第一AP MLD中至 少一个AP对应的关键BSS参数是否发生变化，进一步，第一STA可以根据第一信息确定是否获取第一AP MLD的AP的关键BSS参数。通过这种方式，当第一AP MLD中至少一个AP对应的关键BSS参数发生变化时，第一STA MLD能够及时获知，从而使得第一STA MLD和第一AP MLD能够正常通信，有助于提高通信的可靠性。
结合第一方面，在第一方面的某些实现方式中，该第一信息为计数值。
结合第一方面，在第一方面的某些实现方式中，若第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，则第一信息的取值增加。
结合第一方面，在第一方面的某些实现方式中，若第一AP MLD中的所有AP对应的关键BSS参数均未发生变化，则第一信息的取值不变。
结合第一方面，在第一方面的某些实现方式中，第一信息承载于信标检查字段。
基于上述方案，本申请能够复用信标检查字段，灵活度高，具有较强的可实现性。
结合第一方面，在第一方面的某些实现方式中，信标检查字段承载于业务指示位图TIM帧。
基于上述方案，本申请实施例可以兼容非多链路站点，使得非多链路站点也可以正确解析TIM帧，具有较强的拓展性。
结合第一方面，在第一方面的某些实现方式中，第一信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，该方法还包括：第一AP接收第一帧，该第一帧用于请求第二STA关联的AP对应的关键BSS参数，该第二STA为第一STA MLD中与第一AP MLD关联的站点；该第一AP发送第二帧，该第二帧包括第二STA关联的AP对应的关键BSS参数。
基于上述方案，若第一STA确定第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，第一STA还可以通过第一帧和第二帧获得第二STA关联的AP的关键BSS参数，有助于提高该第一STA MLD的通信可靠性。
结合第一方面，在第一方面的某些实现方式中，该第二STA为第一STA MLD中的所有STA。
结合第一方面，在第一方面的某些实现方式中，该关键BSS参数包括以下一项或多项：包括信道变更通知元素、包括拓展信道变更通知元素、更改增强分布式信道接入EDCA参数元素、包括静态元素、修改直接序列扩频DSSS参数集合、修改免竞争CF参数集合元素、修改高吞吐量HT操作元素、包括宽带宽信道更变元素、包括宽带宽信道更变封套元素、包括操作模式通知元素、包括静态信道元素、修改非常高吞吐量VHT操作元素、修改高效HE操作元素、插入广播TWT元素、包括BSS颜色变更通知元素、修改多用户EDCA参数集合元素、修改空间复用参数集合元素、修改极高吞吐量操作元素。
第二方面，提供了一种通信方法，应用于第一站点多链路设备(station multi-link device，STA MLD)中，该方法可以由第一STA MLD执行，或者，也可以由配置于第一STA MLD中的芯片或电路执行，本申请对此不作限定。以下以由第一STA MLD执行为例进行说明。
该方法可以包括：第一STA MLD的第一STA接收第一信息，该第一信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化；该第一STA根据第一信息确定第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化。
基于上述方案，第一AP可以通过第一信息向第一STA MLD指示第一AP MLD中至 少一个AP对应的关键BSS参数是否发生变化，进一步，第一STA可以根据第一信息确定是否获取第一AP MLD的AP的关键BSS参数。通过这种方式，当第一AP MLD中至少一个AP对应的关键BSS参数发生变化时，第一STA MLD能够及时获知，从而使得第一STA MLD和第一AP MLD能够正常通信，有助于提高通信的可靠性。
结合第二方面，在第二方面的某些实现方式中，该第一信息为计数值。
结合第二方面，在第二方面的某些实现方式中，该方法还包括：第一STA记录第一信息。
结合第二方面，在第二方面的某些实现方式中，该第一STA根据第一信息确定第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化，包括：第一站点根据第一信息的取值和第二信息的取值是否相同确定第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化，其中，该第二信息为第一STA接收第一信息的前一次接收到的信息，且该第二信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化。
结合第二方面，在第二方面的某些实现方式中，该第一站点根据所述第一信息的取值和第二信息的取值是否相同确定所述第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化，包括：若第一信息的取值和第二信息的取值相同，则第一STA确定第一AP MLD中的所有AP对应的关键BSS参数均未发生变化；和/或，若第一信息的取值和第二信息的取值不同，则第一STA确定第一AP MLD中的至少一个AP对应的关键BSS参数发生变化。
结合第二方面，在第二方面的某些实现方式中，该第一信息的取值和第二信息的取值不同，该方法还包括：第一STA MLD的第二STA接收信标帧，该信标帧包括第二STA关联的AP对应的关键BSS参数，该第二STA为第一STA MLD中与第一AP MLD关联的站点。
基于上述方案，若第一STA确定第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，第一STA和第二STA都可以接收信标帧，从而获得该STA关联的AP的关键BSS参数，如此，使得第一STA MLD中第二STA也能获得所在的BSS的关键BSS参数，有助于提高该第二STA的通信可靠性。
结合第二方面，在第二方面的某些实现方式中，该第一信息的取值和第二信息的取值不同，该方法还包括：第一STA发送第一帧，该第一帧用于请求第二STA关联的AP对应的关键BSS参数，该第二STA为第一STA MLD中与第一AP MLD关联的站点；该第一站点接收第二帧，该第二帧包括第二STA关联的AP对应的关键BSS参数。
基于上述方案，若第一STA确定第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，第一STA还可以通过第一帧和第二帧获得第二STA关联的AP的关键BSS参数，有助于提高该第一STA MLD的通信可靠性。
结合第二方面，在第二方面的某些实现方式中，该第二STA为该第一STA MLD中的所有STA。
结合第二方面，在第二方面的某些实现方式中，该第一信息承载于信标检查字段。
基于上述方案，本申请能够复用信标检查字段，灵活度高，具有较强的可实现性。
结合第二方面，在第二方面的某些实现方式中，该信标检查字段承载于业务指示位图 TIM帧。
基于上述方案，本申请实施例可以兼容非多链路站点，使得非多链路站点也可以正确解析TIM帧，具有较强的拓展性。
结合第二方面，在第二方面的某些实现方式中，该关键BSS参数包括以下一项或多项：包括信道变更通知元素、包括拓展信道变更通知元素、更改EDCA参数元素、包括静态元素、修改DSSS参数集合、修改CF参数集合元素、修改HT操作元素、包括宽带宽信道更变元素、包括宽带宽信道更变封套元素、包括操作模式通知元素、包括静态信道元素、修改VHT操作元素、修改HE操作元素、插入广播TWT元素、包括BSS颜色变更通知元素、修改多用户EDCA参数集合元素、修改空间复用参数集合元素、修改极高吞吐量操作元素。
第三方面，提供了一种通信装置，该装置可以为第一AP MLD，或者为配置于第一AP MLD中的芯片或电路。或者，该装置可以为第一AP MLD的第一AP，或者为配置于第一AP MLD的第一AP中的芯片或电路。
该装置的包括：处理单元，用于生成第一信息，该第一信息用于指示该装置中的至少一个AP对应的关键BSS参数是否发生变化；收发单元，用于向第一STA MLD发送该第一信息。
结合第三方面，在第三方面的某些实现方式中，该第一信息为计数值。
结合第三方面，在第三方面的某些实现方式中，若该装置中的至少一个AP对应的关键BSS参数发生变化，则第一信息的取值增加。
结合第三方面，在第三方面的某些实现方式中，若装置中的所有AP对应的关键BSS参数均未发生变化，则第一信息的取值不变。
结合第三方面，在第三方面的某些实现方式中，第一信息承载于信标检查字段。
结合第三方面，在第三方面的某些实现方式中，信标检查字段承载于业务指示位图TIM帧。
结合第三方面，在第三方面的某些实现方式中，第一信息用于指示该装置中的至少一个AP对应的关键BSS参数发生变化，该收发单元还用于：接收来自第一STA的第一帧，该第一帧用于请求第二STA关联的AP对应的关键BSS参数，该第二STA为第一STA MLD中与该装置关联的站点；向该第一STA发送第二帧，该第二帧包括第二STA关联的AP对应的关键BSS参数。
结合第三方面，在第三方面的某些实现方式中，该第二STA为第一STA MLD中的所有STA。
结合第三方面，在第三方面的某些实现方式中，该关键BSS参数包括以下一项或多项：包括信道变更通知元素、包括拓展信道变更通知元素、更改增强分布式信道接入EDCA参数元素、包括静态元素、修改直接序列扩频DSSS参数集合、修改免竞争CF参数集合元素、修改高吞吐量HT操作元素、包括宽带宽信道更变元素、包括宽带宽信道更变封套元素、包括操作模式通知元素、包括静态信道元素、修改非常高吞吐量VHT操作元素、修改高效HE操作元素、插入广播TWT元素、包括BSS颜色变更通知元素、修改多用户EDCA参数集合元素、修改空间复用参数集合元素、修改极高吞吐量操作元素。
第四方面，提供了一种通信装置，该装置可以是第一STA MLD，或者为配置于第一 STA MLD中的芯片或电路。或者，该装置可以为第一STA MLD和/或第二STA的第一STA，或者为配置于第一STA MLD的第一STA和/或第二STA中的芯片或电路。
该装置可以包括：收发单元，用于接收第一信息，该第一信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化；处理单元，用于根据第一信息确定第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化。
结合第四方面，在第四方面的某些实现方式中，该第一信息为计数值。
结合第四方面，在第四方面的某些实现方式中，处理单元还用于：记录第一信息。
结合第四方面，在第四方面的某些实现方式中，处理单元具体用于：根据第一信息的取值和第二信息的取值是否相同确定第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化，其中，该第二信息为该装置接收第一信息的前一次接收到的信息，且该第二信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化。
结合第四方面，在第四方面的某些实现方式中，处理单元具体用于：若第一信息的取值和第二信息的取值相同，则确定第一AP MLD中的所有AP对应的关键BSS参数均未发生变化；和/或，若第一信息的取值和第二信息的取值不同，则确定第一AP MLD中的至少一个AP对应的关键BSS参数发生变化。
结合第四方面，在第四方面的某些实现方式中，该第一信息的取值和第二信息的取值不同，该装置还包括：第一收发单元，用于接收信标帧，该信标帧包括第二STA关联的AP对应的关键BSS参数，该第二STA为该装置中与第一AP MLD关联的站点。
结合第四方面，在第四方面的某些实现方式中，该第一信息的取值和第二信息的取值不同，收发单元还用于：发送第一帧，该第一帧用于请求第二STA关联的AP对应的关键BSS参数，该第二STA为该装置中与第一AP MLD关联的站点；接收第二帧，该第二帧包括第二STA关联的AP对应的关键BSS参数。
结合第四方面，在第四方面的某些实现方式中，该第二STA为该装置中的所有STA。
结合第四方面，在第四方面的某些实现方式中，该第一信息承载于信标检查字段。
结合第四方面，在第四方面的某些实现方式中，该信标检查字段承载于业务指示位图TIM帧。
结合第四方面，在第四方面的某些实现方式中，该关键BSS参数包括以下一项或多项：包括信道变更通知元素、包括拓展信道变更通知元素、更改EDCA参数元素、包括静态元素、修改DSSS参数集合、修改CF参数集合元素、修改HT操作元素、包括宽带宽信道更变元素、包括宽带宽信道更变封套元素、包括操作模式通知元素、包括静态信道元素、修改VHT操作元素、修改HE操作元素、插入广播TWT元素、包括BSS颜色变更通知元素、修改多用户EDCA参数集合元素、修改空间复用参数集合元素、修改极高吞吐量操作元素。
第五方面，提供一种通信装置，包括处理器。该处理器与存储器耦合，可用于执行存储器中的指令，以实现上述第一方面及第一方面的任一种可能实现方式中的方法，或第二方面及第二方面的任一种可能实现方式中的方法。可选地，该装置还包括存储器。可选地，该装置还包括通信接口，处理器与通信接口耦合。
在一种实现方式中，该装置为第一AP MLD。当该装置为第一APMLD时，所述通信接口可以是收发器，或，输入/输出接口。
在另一种实现方式中，该装置为配置于第一APMLD中的芯片。当该装置为配置于第一APMLD的芯片时，所述通信接口可以是输入/输出接口。
在一种实现方式中，该装置为第一STA MLD。当该装置为第一STAMLD时，所述通信接口可以是收发器，或，输入/输出接口。
在另一种实现方式中，该装置为配置于第一STAMLD中的芯片。当该装置为配置于第一STAMLD中的芯片时，所述通信接口可以是输入/输出接口。
在另一种实现方式中，该装置为芯片或芯片系统。
可选地，所述收发器可以为收发电路。可选地，所述输入/输出接口可以为输入/输出电路。
第六方面，提供一种计算机可读存储介质，其上存储有计算机程序，所述计算机程序被装置执行时，使得所述装置实现第一方面及第一方面的任一种可能实现方式中的方法，或第二方面及第二方面的任一种可能实现方式中的方法。
第七方面，提供一种包含指令的计算机程序产品，所述指令被计算机执行时使得装置实现第一方面及第一方面的任一种可能实现方式中的方法，或第二方面及第二方面的任一种可能实现方式中的方法。
第八方面，提供一种通信系统，包括如前所述的第一AP MLD和第一STA MLD。
附图说明
图1是本申请实施例提供的一种AP MLD和STA MLD的结构示意图。
图2是本申请实施例提供的通信系统的结构示意图。
图3示出了本申请实施例提供的一种TIM帧的帧结构示意图。
图4示出了本申请实施例提供的一种TIM帧的帧结构示意图。
图5示出了本申请实施例提供的一种TIM帧的帧结构示意图。
图6是本申请实施例提供的一种通信的方法的示意图。
图7是本申请实施例提供的一种通信装置的示意性框图。
图8是本申请实施例提供的一种通信设备的示意性框图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
为了更好的理解本申请实施例，首先对本申请实施例的相关概念进行描述。
1、多链路设备
本申请实施例适用的无线通信系统可以为无线局域网(wireless local area network，WLAN)或蜂窝网，该通信方法可以由无线通信系统中的通信设备或通信设备中的芯片或处理器实现，该通信设备可以是一种支持多条链路并行进行传输的无线通信设备，例如，称为多链路设备(Multi-link device)或多频段设备(multi-band device)。相比于仅支持单条链路传输的设备来说，多链路设备具有更高的传输效率和更高的吞吐量。
多链路设备包括一个或多个隶属的站点STA(affiliated STA)，隶属的STA是一个逻辑上的站点，可以工作在一条链路上。其中，隶属的站点可以为接入点(Access Point，AP)或非接入点站点(non-Access Point Station,non-AP STA)。为描述方便，本申请将隶 属的站点为AP的多链路设备可以称为多链路AP或多链路AP设备或AP多链路设备(AP multi-link device，AP MLD)，隶属的站点为non-AP STA的多链路设备可以称为多链路STA或多链路STA设备或STA多链路设备(STA multi-link device，STA MLD)。为描述方便，“多链路设备包括隶属STA”在本申请实施例中也简要描述为“多链路设备包括STA”。
值得注意的是，多链路设备包括多个逻辑站点，每个逻辑站点工作在一条链路上，但允许多个逻辑站点工作在同一条链路上。
多链路设备可以遵循802.11系列协议实现无线通信，例如，遵循极高吞吐率(extremely high throughput，EHT)站点，或遵循基于802.11be或兼容支持802.11be的站点，实现与其他设备的通信，当然其他设备可以是多链路设备，也可以不是多链路设备。
示例性的，本申请实施例中的多链路设备可以是单个天线的设备，也可以是多天线的设备。例如，可以是两个以上天线的设备。本申请实施例对于多链路设备包括的天线的数目并不进行限定。在本申请的实施例中，多链路设备可以允许同一接入类型的业务在不同链路上传输，甚至允许相同的数据包在不同链路上传输；也可以不允许同一接入类型的业务在不同链路上传输，但允许不同接入类型的业务在不同的链路上传输。
示例性的，多链路设备为具有无线通信功能的装置，该装置可以为一个整机的设备，还可以是安装在整机设备中的芯片或处理系统等，安装这些芯片或处理系统的设备可以在这些芯片或处理系统的控制下，实现本申请实施例的方法和功能。例如，本申请实施例中的STA MLD具有无线收发功能，可以为支持802.11系列协议，可以与AP MLD或其他STA MLD或单链路设备进行通信，例如，STA MLD是允许用户与AP通信进而与WLAN通信的任何用户通信设备。例如，STA MLD可以为平板电脑、桌面型、膝上型、笔记本电脑、超级移动个人计算机(Ultra-mobile Personal Computer，UMPC)、手持计算机、上网本、个人数字助理(Personal Digital Assistant，PDA)、手机等可以联网的用户设备，或物联网中的物联网节点，或车联网中的车载通信装置等，STA MLD还可以为上述这些终端中的芯片和处理系统。
本申请实施例中的AP MLD为STA MLD提供服务的装置，可以支持802.11系列协议。例如，AP MLD可以为通信服务器、路由器、交换机、网桥等通信实体，或，所述AP MLD可以包括各种形式的宏基站，微基站，中继站等，当然AP MLD还可以为这些各种形式的设备中的芯片和处理系统，从而实现本申请实施例的方法和功能。并且，多链路设备可以支持高速率低时延的传输，随着无线局域网应用场景的不断演进，多链路设备还可以应用于更多场景中，比如为智慧城市中的传感器节点(比如，智能水表，智能电表，智能空气检测节点)，智慧家居中的智能设备(比如智能摄像头，投影仪，显示屏，电视机，音响，电冰箱，洗衣机等)，物联网中的节点，娱乐终端(比如AR，VR等可穿戴设备)，智能办公中智能设备(比如，打印机，投影仪等)，车联网中的车联网设备，日常生活场景中的一些基础设施(比如自动售货机，商超的自助导航台，自助收银设备，自助点餐机等)。本申请实施例中对于STA MLD和AP MLD的具体形式不做特殊限制，在此仅是示例性说明。其中，802.11协议可以为支持802.11be或兼容802.11be的协议。
多链路设备工作的频段可以包括但不限于：sub 1GHz，2.4GHz，5GHz，6GHz以及高频60GHz。
示例性的，本申请实施例中的多链路设备可以是单个天线的设备，也可以是多天线的设备。例如，本申请实施例中的多链路设备可以是两个以上天线的设备。本申请实施例对于多链路设备包括的天线的数目并不进行限定。
图1是本申请实施例提供的一种AP MLD和STA MLD的结构示意图。图1示出了AP MLD为多天线，STA MLD为单天线的结构示意图，802.11标准关注AP MLD和STA MLD中的物理层(physical layer，PHY)和媒体接入控制(media access control，MAC)层部分。
2、链路标识
链路标识表征的是工作在一条链路上的一个站点，也就是说，如果一条链路上有多于1个站点，则多于1个链路标识表征它们。下文提到的链路有时也表示工作在该条链路上的站点。
AP MLD与STA MLD在数据传输时，可以采用链路标识来标识一条链路或一条链路上的站点。在通信之前，AP MLD与STA MLD可以先协商或沟通链路标识与一条链路或一条链路上的站点的对应关系，或者由AP MLD的AP广播链路标识与一条链路或一条链路上的站点的对应关系。因此在数据传输中，不传输大量的信令信息用来指示链路或链路上的站点，携带链路标识即可，降低了信令开销，提升了传输效率。
一个示例中，AP MLD在建立基本服务集(basic service set，BSS)时发送的管理帧，比如信标(beacon)帧，会携带一个元素，该元素包括多个链路标识信息字段。链路标识信息字段可以指示一个链路标识与工作在该链路标识对应的链路上的站点的对应关系。链路标识信息字段不仅包括链路标识，还包括以下一个或多个信息：媒体接入控制(Media Access Control，MAC)地址，操作集，信道号。其中，MAC地址，操作集，信道号中的一个或多个可以指示一条链路。对于AP来说，AP的MAC地址也就是AP的BSSID(basic service set identifier，基本服务集标识)。另一个示例中，在多链路设备关联过程中，AP MLD和STA多链路设备协商多个链路标识信息字段。其中，多链路设备关联是指AP MLD的一个AP与STA MLD的一个STA进行一次关联，该关联可帮助STA MLD的多个STA与AP MLD的多个AP分别关联，其中，一个STA关联到一个AP。
在后续的通信中，AP MLD或者STA多链路设备会通过链路标识来表征STA多链路设备中的一个站点/AP，链路标识还可表征该工作在该链路的AP的MAC地址，工作的操作集，信道号中的一个或多个属性，比如说链路标识表征<操作集，信道号，AP的MAC地址>，其中，AP的MAC地址等同于AP的BSSID(basic service set identifier，基本服务集标识)。
本申请提供的技术方案可以适用于WLAN场景，例如可以适用于IEEE 802.11系统标准。例如，支持IEEE 802.11ax下一代Wi-Fi协议的系统，802.11be，Wi-Fi 7或EHT，再如802.11be下一代，Wi-Fi 8等802.11系列协议的无线局域网系统，还可以应用于基于超带宽UWB的无线个人局域网系统，感知sensing系统。
虽然本申请实施例主要以部署IEEE 802.11的网络为例进行说明，但本领域技术人员容易理解，本申请涉及的各个方面可以扩展到采用各种标准或协议的其它网络，例如，BLUETOOTH(蓝牙)，高性能无线LAN(high performance radio LAN，HIPERLAN)(一种与IEEE 802.1 1标准类似的无线标准，主要在欧洲使用)以及广域网(WAN)、个人 区域网(personal area network,PAN)或其它现在已知或以后发展起来的网络。因此，无论使用的覆盖范围和无线接入协议如何，本申请提供的各种方面可以适用于任何合适的无线网络。
3、基本服务集(BSS)
BSS用于描述WLAN中一组能够相互通信的设备。WLAN中可以包括多个BSS。每一个BSS具有唯一的标识，称为基本服务集标识符(BSSID)。
一个BSS可以包括多个站点(station，STA)。站点可以为AP或者non-AP STA。可选的，一个BSS可以包含一个AP和多个关联该AP的non-AP STA。
图2是本申请实施例提供的通信系统的结构示意图。图2的(a)以无线局域网为例，介绍了本申请实施例应用的一种通信系统100。图2的(b)和图2的(c)以无线局域网中多链路设备与其他设备通过多条链路进行通信为示例，分别示出了通信系统200、通信系统300的结构示意图。
如图2的(a)所示，该通信系统100包括站点101和站点102。其中，站点101可以与站点102之间采用多条链路进行通信，从而达到提升吞吐量的效果。站点101可以为多链路设备，站点102可以为单链路设备或多链路设备等。一种场景中，站点101为AP MLD，站点102为STA MLD或站点(比如单链路站点)。另一场景中，站点101为STA MLD，站点102为AP(比如单链路AP)或AP MLD。又一种场景中，站点101为AP MLD，站点102为AP MLD或AP；又一种场景中，站点101为STA MLD，站点102为STA MLD或STA(比如单链路站点)。当然，该无线局域网还可包括其他设备。图2的的(a)示意的设备的数量及类型仅是示例性的。
如图2的(b)所示，该通信系统200包括AP MLD 201和STA MLD 202。其中，AP MLD 201包括隶属的AP1和AP2，STA MLD 202包括隶属的STA1和STA2，且AP MLD 2021和STA MLD 202采用链路1和链路2并行进行通信。
如图2的(c)所示，该通信系统300包括AP MLD301、STA MLD302，STA MLD303以及STA304，图2的(c)示出了AP MLD301与STA MLD302，STA MLD303以及STA304进行通信的场景。其中，AP MLD301包括隶属的AP1、AP2和AP3。STA MLD302包括隶属的三个站点，STA1、STA2和STA3。STA MLD303包括2个隶属的站点，STA4，STA5。STA304为单链路设备。AP MLD301可以分别采用链路1、链路2和链路3与STA MLD302进行通信，采用链路2和链路3与STA MLD303进行通信，采用链路1与STA304通信。一个示例中，STA304工作在2.4GHz频段，STA MLD303中，STA4工作在5GHz频段，STA5工作在6GHz频段。STA MLD302中，STA1工作在2.4GHz频段，STA2工作在5GHz频段，STA3工作在6GHz频段。AP MLD301中工作在2.4GHz频段的AP1可以通过链路1与STA304和STA MLD302中的STA1之间传输上行或下行数据。AP MLD301中工作在5GHz频段的AP2可以通过链路2与STA MLD 303中工作在5GHz频段的STA4之间传输上行或下行数据，还可通过链路2与和STA MLD302中工作在5GHz频段的STA2之间传输上行或下行数据。AP MLD301中工作在6GHz频段的AP3可通过链路3与STA MLD302中工作在6GHz频段的STA3之间传输上行或下行数据，还可通过链路3与STA MLD中的STA5之间传输上行或下行数据。
需要说明的是，图2的(b)仅示出了AP MLD支持2个频段，图2的(c)仅以AP MLD301 支持三个频段(2.4GHz，5GHz，6GHz)，每个频段对应一条链路，AP MLD301可以工作在链路1、链路2或链路3中的一条或多条链路为例进行示意。在AP侧或者STA侧，这里的链路还可以理解为工作在该链路上的站点。实际应用中，AP MLD和STA MLD还可以支持更多或更少的频段，即AP MLD和STA MLD可以工作在更多条链路或更少条链路上，本申请实施例对此并不进行限定。
在802.11协议中，STA包括两种工作模式，一种是非节能模式，另一种是节能模式。当STA工作在非节能模式时，该STA上无论是否有数据传输，STA一直处于醒来状态，也就是活跃模式(active mode)。当STA工作在节能模式时，在与AP传输数据时，STA可以处于醒来状态(awake state)；在与AP之间没有数据传输的时候，STA可以处于休眠状态(doze state)以节省功耗。STA可以通过向AP发送帧来指示该STA是否处于节能模式。例如，该帧中的MAC头中的帧控制字段(frame control field)中的节能比特置1用于向AP指示该STA处于节能模式，该帧中的MAC头中的帧控制字段(frame control field)中的节能比特置0用于向AP指示该STA处于非节能模式。
可理解的，本申请提及的“数据传输”和“传输数据”泛指通信，其中的“数据”泛指通信的信息，并不局限于数据信息，还可以是信令信息等。
在基于无线网络管理(wireless network management，WNM)节能机制，STA可以跟AP沟通一个醒来周期，AP在每个醒来周期的开始发送一个广播的业务指示位图(traffic indication map，TIM)帧给对应的多个STA，该TIM帧远短于信标(Beacon)帧，TIM帧包括的TIM元素用来告知多个STA是否有相应的下行业务指示。由于TIM帧远短于信标帧，因此STA可以获得节能效果。在WNM节能机制中，STA发送TIM广播请求(broadcast request)帧或者AP回复的TIM广播响应(broadcast response)帧的TIM广播间隔(TIM broadcast Interval)字段用于指示醒来周期。TIM广播间隔通常设置大于信标帧间隔。协商完醒来周期后，支持TIM广播的站点只需在醒来周期接收TIM帧，而无需周期性接收信标帧。
图3示出了本申请实施例提供的一种TIM帧的帧结构示意图。图3所示的TIM帧可以适用于非多链路站点。
如图3所示，TIM帧中帧载体可以包括以下至少一项：类型字段、未保护无线网络管理(wireless network management，WNM)行为字段、信标检查字段、时戳字段、TIM元素等。其中，时戳字段用于指示时钟信息，信标检查(check beacon)字段用于指示站点的所在的BSS是否有关键BSS参数更新，TIM元素用来告知站点是否有下行单播/组播业务。
示例性的，若AP所在的BSS有关键BSS参数更新，则该信标检查字段的值增加，比如加1。例如，AP确定BSS有关键BSS参数更新时，将信标检查字段值增加1，其中信标检查字段的初始值为0。STA每次都会记录接收到的信标检查字段的值。如果最近接收到的业务中的信标检查字段与上次接收到的信标检查字段的值不同，则STA会去接收来AP发送的信标帧。
图3示出了适用于单链路站点的TIM帧，该方案没有考虑多链路设备情况下的TIM广播机制，导致站点多链路设备中的一个站点无法获得AP多链路设备中的多个AP或其管理的多个BSS是否关键BSS参数的更新信息。
图4和图5示出了多链路设备通信场景中的TIM帧，对于多链路设备来说，TIM帧又可以称为多链路TIM帧，该多链路TIM帧也包括未保护WNM行为字段，其中，未保护WNM行为字段的行为值如表1所示。
表1
示例性的，如表1所示，行为值设置成其中一个保留值，比如2，可以用于指示该TIM帧为多链路TIM帧，从而将该多链路TIM帧与图3中所示的传统TIM帧区分开。本申请实施例对于未保护WNM行为字段的一个保留值的具体取值并不进行限定，例如还可以是2-255中的其他值，在此仅是示例性说明。
图4示出了本申请实施例提供的一种TIM帧的帧结构示意图。图4所示的TIM帧可以适用于多链路通信场景。如图4所示，帧载体包括类型、未保护WNM行为字段、Beacon检查字段、TIM元素字段、以及链路标识信息字段。可选的，还可以包括时戳字段。图4所示的多链路TIM帧的信标帧检查字段用于指示工作在链路标识信息字段所指示的链路是否有关键BSS参数更新，TIM元素用来指示站点多链路设备/站点是否具有下行单播/组播业务信息。
图5示出了本申请实施例提供的一种TIM帧的帧结构示意图。图5所示的TIM帧可以适用于多链路通信场景。如图5所示，帧载体除了包括类型、未保护WNM行为字段，还包括链路个数字段。在链路个数字段指示的链路个数为多个时，对于每个链路，还包括Beacon检查字段、TIM元素字段、以及链路标识信息字段。可选的，还可以包括一个时戳字段或者多个时戳字段。图5所示的多链路TIM帧中，每一个信标检查字段对应一个链路标识信息字段，用来指示该链路标识信息字段所在的链路是否有关键BSS参数更新信息。
示例性的，对于图4或图5所示的多链路TIM帧，若链路标识信息字段指示的链路所在的BSS有关键BSS参数更新，或者，链路标识信息字段指示的链路有关键参数更新，则该Beacon检查字段的值增加，比如加1。例如，第一AP确定某条链路上的BSS有关键BSS参数更新时，将该链路对应的Beacon检查字段值增加1。上述BSS参数也可以理解为链路参数。
示例性的，多链路STA每次都会记录接收到的各条链路对应的Beacon检查字段的值。如果最近接收到的业务中的某条链路对应的Beacon检查字段与上次接收到的该条链路对应的Beacon检查字段的值不同，则多链路STA会在该链路上接收来自多链路AP发送的信标帧。
图4和图5的方案虽然考虑了多链路设备的情况，但是由于其提出了一个新的多链路TIM帧，导致非多链路站点无法接收该多链路TIM帧，也就是说存在兼容问题。为了同时支持多链路设备和非多链路站点，AP需要发送2种帧，一个是图3所示的TIM帧，另 一个是图4或图5所示的多链路TIM帧。
综上，对于站点多链路设备来说，如果其中一个站点支持TIM广播特性，而其他站点处于休眠状态，那么这个站点可以在指定时间间隔内接收TIM帧，获得该站点所关联的AP对应的关键BSS参数的更新信息。然而，该站点无法获取该多链路设备的其他站点所关联的AP对应的关键BSS参数的更新信息，从而导致该站点多链路设备或该站点无法与这些AP进行正常的通信。
有鉴于此，本申请实施例提供一种通信的方法，有助于提高通信的可靠性。
图6是本申请实施例提供的一种通信的方法的示意图，如图6所示，该方法600包括以下步骤。
S610，第一AP MLD的第一AP生成第一信息，该第一信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化。
应理解，WLAN可以包括多个BSS，每个BSS可以包括一个AP和多个关联于该AP的STA，也就是说，每个AP对应一个BSS。其中，关键BSS参数是用于描述BSS的重要的参数，因此，AP与关键BSS参数之间也具有一一对应关系。“AP对应的关键BSS参数”，也可以理解为是AP所在的BSS的关键BSS参数，或者说AP的关键BSS参数。在多链路通信场景下，“AP对应的关键BSS参数”，也可以理解为是AP对应的链路所在的BSS的关键BSS参数。
其中，该第一信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化，也可以说，第一信息用于指示第一AP MLD中的任一个AP对应的关键BSS参数是否发生变化，或者说，第一信息用于指示第一AP MLD中的所有AP对应的关键BSS参数是否发生变化，或者说，第一信息用于指示第一AP MLD中的所有AP中的每个AP对应的关键BSS参数是否发生变化。
其中，第一AP MLD中关键BSS参数发生变化的AP可以是一个，也可以是多个。一个AP内存在的关键BSS参数变化事件可以是一个，也可以是多个。
应理解，第一信息可以仅指示第一AP MLD中是否存在AP的关键BSS参数发生变化，而不指示第一AP MLD中存在哪些AP的关键BSS参数发生变化。
此外，第一AP MLD的第一AP生成第一信息，该第一信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化，可以理解为，在第一AP MLD中有至少一个AP对应的关键BSS参数发生变化时，第一AP生成第一信息，该第一信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数发生变化。或者，在第一AP中所有AP对应的关键BSS参数均未发生变化时，第一AP生成第一信息，该第一信息用于指示第一AP MLD中的所有AP对应的关键BSS参数均未发生变化。
其中，关键BSS参数发生变化，也可以说，关键BSS参数被更新，或者，关键BSS参数更新。
可选地，关键BSS参数发生变化的AP可以是第一AP，也可以是第一AP MLD中除第一AP之外的任一个AP，或者是第一AP MLD中的多个AP，该多个AP可以包括第一AP，也可以不包括第一AP。
其中，关键BSS参数变化事件可以用于识别关键BSS参数是否发生变化，关键BSS参数发生变化，可以理解为信标帧存在关键BSS参数变化事件。
在一种实现方式中，关键BSS参数变化事件包括一下至少一项：包括信道变更通知元素(Inclusion of a Channel Switch Announcement element)、包括拓展信道变更通知元素(Inclusion of an Extended Channel Switch Announcement element)、更改增强分布式信道接入(enhanced distribution channel access，EDCA)参数元素(Modification of the EDCA parameters element)、包括静态元素(Inclusion of a Quiet element)、修改直接序列扩频(direct sequence spread spectrum，DSSS)参数集合(Modification of the DSSS Parameter Set)、修改免竞争(contention free，CF)参数集合元素(Modification of the CF Parameter Set element)、修改高吞吐量(high throughput，HT)操作元素(Modification of the HT Operation element)、包括宽带宽信道更变元素(Inclusion of a Wide Bandwidth Channel Switch element)、包括宽带宽信道更变封套元素(Inclusion of a Channel Switch Wrapper element)、包括操作模式通知元素(Inclusion of an Operating Mode Notification element)、包括静态信道元素(Inclusion of a Quiet Channel element)、修改VHT(very high throughput)操作元素(Modification of the VHT Operation element)、修改HE(high efficient)操作元素(Modification of the HE Operation element)、插入广播基于目标唤醒时间(target wake up time，TWT)元素(Insertion of a Broadcast TWT element)、包括BSS颜色变更通知元素(Inclusion of the BSS Color Change Announcement element)、修改多用户(multi-user，MU)EDCA参数集合元素(Modification of the MU EDCA Parameter Set element)、修改空间复用参数集合元素(Modification of the Spatial Reuse Parameter Set element)、修改EHT(extremely high throughput)操作元素(Modification of the EHT Operation element)。
应理解，对于AP MLD来说，任一个AP均可以获取该AP MLD隶属的所有AP的关键BSS参数的取值是否发生变化。
其中，第一AP是与其至少一个关联的站点的建立TIM广播服务的AP，可选的，该站点隶属于站点MLD。
S620，第一AP向第一STA MLD中的第一STA发送该第一信息，相应地，第一STA MLD中的第一STA接收第一信息。
其中，第一STA MLD和第一AP MLD是多链路通信场景中的通信设备，第一AP为第一STA MLD中隶属的任一个AP，第一SAT为第一STA MLD中隶属的一个STA，且第一STA关联于第一AP，即第一AP和第一STA之间具有通信链路。
可选地，第一AP向第一STA MLD中的第一STA发送该第一信息，也可以说，第一AP在其工作的链路发送该第一信息。
可选地，第一STA MLD中的第一STA接收第一信息，也可以说，第一STA在其工作的链路接收该第一信息。
其中，该第一站点是与其关联的AP建立TIM广播服务的站点，可选的，该AP隶属于AP MLD。
根据上述实施例，第一AP可以通过第一信息向第一STA MLD指示第一AP MLD中至少一个AP对应的关键BSS参数是否发生变化，进一步，第一STA可以根据第一信息确定是否获取第一AP MLD的AP的关键BSS参数。通过这种方式，当第一AP MLD中至少一个AP对应的关键BSS参数发生变化时，第一STA能够及时获知，从而使得第一STA MLD和第一AP MLD能够正常通信，有助于提高通信的可靠性。
可选地，该方法还包括：S630，第一STA根据第一信息确定第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化。
具体地，第一信息可以是显示的指示，也就是，第一STA在解析第一信息后即可获得第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化。
例如，第一信息为计数值。作为示例，若第一AP MLD中的一个或多个AP对应的关键BSS参数发生变化，则第一信息的取值增加。若第一AP MLD中的所有AP对应的关键BSS参数均未发生变化，则第一信息的取值不变。
具体地，第一信息也可以是隐式的指示，也就是，第一STA解析第一信息后，可以进一步根据内部的判断逻辑获得第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化。
例如，第一信息为比特值，作为示例，可以通过未保护WNM行为字段中预留的1比特作为第一信息。当该1比特的取值为1时，表示第一AP MLD中的一个或多个AP对应的关键BSS参数发生变化，当该1比特的取值为0时，表示第一AP MLD中的所有AP对应的关键BSS参数均未发生变化。
可选地，第一STA可以根据第一信息确定是否获取第一AP MLD的AP的关键BSS参数。例如，若第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，则获取发生变化的AP的关键BSS参数。
可选地，作为一种可能的实现方式，该第一信息为计数值。
其中，若第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，则第一信息的取值增加。
应理解，在S630之前，第一AP可以向第一STA MLD中的第一STA发送第二信息，相应地，第一STA MLD中的第一STA接收第二信息，其中，第二信息为第一AP发送第一信息前一次发送的、用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化的信息。第一信息的取值有增加，可以理解为，第一信息的取值较第二信息的取值有所增加。第一信息的取值没有增加，可以理解为，第一信息的取值等于第二信息的取值，或者第一信息的取值较第五信息的取值保持不变。
例如，第二信息的取值为0，如果在发送第一信息之前，若存在第一AP MLD中的一个AP对应的一个关键BSS参数发生变化，那么第一信息的取值为1。
例如，第二信息的取值为0，如果在发送第一信息之前，若存在第一AP MLD中的一个AP对应的多个关键BSS参数发生变化，那么第一信息的取值为1。
又如，第二信息的取值为0，如果在发送第一信息之前，如果第一AP MLD中的存在多个AP对应的关键BSS参数发生变化，无论该多个AP的具体个数是多少，也无论一个AP有多少个关键BSS参数发生变化，第一信息的取值加1。
其中，若第一AP MLD中的所有AP对应的关键BSS参数均未发生变化，则第一信息的取值不变。
类似地，第一信息的取值不变，可以理解为，第一信息的取值较第二信息的取值保持不变。
可选地，该方法600还包括：第一STA记录(maintain)第一信息。
应理解，“记录”也可以说保存、维护、存储。
换言之，第一STA会记录接收到的第一信息的取值。
作为一个示例，在第一信息的取值发生变化时，第一STA记录的第一信息的取值。也就是，第一STA根据第一信息的取值是否发生变化确定是否更新第一信息的取值。
作为又一个示例，第一STA接收到第一信息后，无论第一信息的取值与之前记录的取值是否相同，第一STA均记录本次接收的第一信息，丢弃之前记录的取值。
可选地，第一STA记录第一信息之前记录的信息称为第二信息，该第二信息是接收第一信息的前一次接收到的、用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化的信息。
第一STA在接收到第一信息之后，可以将第一信息和第一信息进行比较，从而根据第一信息的取值和第二信息的取值是否相同确定第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化。
作为一个示例，第一信息的取值和第二信息的取值不同，在这种情况下，第一STA确定第一AP MLD中的至少一个AP对应的关键BSS参数发生变化。
在这种情况下，第一STA MLD可以进一步通过以下两种方式中的任一种获取第二STA关联的AP对应的关键BSS参数，其中，第二STA是第一STA MLD中与第一AP MLD建立关联的站点。
可选的，第二STA为第一STA MLD中与第一AP MLD关联的所有站点。
例如，假设第一STA MLD中包括3个隶属的STA，记为STA#1、STA#2和STA#3，其中，STA#1、STA#2和STA#3为关联于第一AP MLD的站点，此时第二STA就是STA#1、STA#2和STA#3。
方式一：第一STA MLD的第二STA接收信标(beacon)帧，该信标帧包括第二STA关联的AP对应的关键BSS参数。
应理解，第一STA收到的第一信息会触发第二STA接收信标(beacon)帧，其中，触发也可以说使能或者使得。
还应理解，触发可以理解为第一STA和第二STA之间的信息交互，例如，若第二STA处于休眠状态，则第二STA可以转变为醒来状态，从而第二STA也可以从第一STA获取第一AP MLD中的至少一个AP对应的关键BSS参数发生变化的信息。触发也可以理解为第一STA MLD内部的处理过程，对第一STA MLD来说，第一STA确定第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，则第一STA MLD中的所有STA均去获取第一AP MLD中与其关联的那个AP对应的关键BSS参数发生变化的信息。
也就是说，若第一STA确定第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，那么第一STA MLD中的所有第二STA都会接收信标帧。
基于上述方案，若第一STA确定第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，第一STA和第二STA都可以接收信标帧，从而获得该STA关联的AP的关键BSS参数，如此，使得第一STA MLD中第二STA也能获得所在的BSS的关键BSS参数，有助于提高该第二STA的通信可靠性。
方式二：第一STA向第一AP发送第一帧，该第一帧用于请求第二STA关联的AP对应的关键BSS参数。进一步，第一AP在接收到第一帧后，可以向第一STA发送第二帧，该第二帧包括第二STA关联的AP对应的关键BSS参数。
具体地，假设第二STA包括STA#1和STA#2，STA#1关联的AP记为AP#1，STA#2关联的AP记为AP#2，那么，这里的第二STA关联AP指的就是AP#1和AP#2。若STA#1确定第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，那么STA#1可以发送多链路探测请求帧，该多链路探测请求帧用于请求AP#1对应的关键BSS参数以及AP#2对应的关键BSS参数。
也就是说，若第一STA确定第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，那么第一STA可以获取第一STA MLD中与第一AP MLD关联的所有站点的AP对应的关键BSS参数。
具体地，第一帧可以是多链路探测请求帧。
其中，多链路探测请求帧可以包括请求的一个或多个AP对应的链路标识，可选的，多链路探测请求帧包括该一个或多个AP隶属的第一AP MLD的MLD标识。可选的，该一个或多个AP为第一STA MLD的所有站点对应关联的AP。
可选的，每个AP对应的链路标识位于多链路元素的站点概括字段(per STA profile)中，第一AP MLD的MLD标识位于多链路元素的公共信息字段中。
具体地，第二帧可以是多链路探测响应帧。
其中，多链路探测响应帧可以包括请求的一个或多个AP对应的链路标识，可选的，多链路探测响应帧包括该一个或多个AP隶属的第一AP MLD的MLD标识。可选的，该一个或多个AP为第一STA MLD的所有站点对应关联的AP。
可选的，每个对应AP的链路标识位于多链路元素的站点概括子元素字段(per STA profile subelement)中，第一AP MLD的MLD标识位于多链路元素的公共信息字段中，其中每个站点概括子元素字段包括一个AP的元素信息，作为示例，每个站点概括子元素字段可以包括发生变化的关键BSS参数的信息，即包括对应的元素。例如，关键BSS参数变化事件是包括信道变更通知元素(Inclusion of a Channel Switch Announcement element)，则对应元素为信道变更通知元素(Channel Switch Announcement element)。
基于上述方案，若第一STA确定第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，第一STA还可以通过第一帧和第二帧获得第二STA关联的AP的关键BSS参数，有助于提高该第一STA MLD的通信可靠性。
可选的，在上述方式一和方式二中，第二STA为工作在使能(enable)状态链路(link)的站点。
作为一个示例，第一信息的取值和第二信息的取值相同，在这种情况下，第一STA确定第一AP MLD中的所有AP对应的关键BSS参数均未发生变化。
可选地，第一信息的个数为1个。
可选地，第一信息承载于信标检查字段。
具体地，可以通过信标检查字段的取值来指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化。
应理解，当第一信息承载于信标检查字段时，信标检查字段个数为1个。
可选地，第一信息承载于TIM帧中。
具体地，可以复用TIM帧，通过TIM帧中的信标检查字段承载第一信息，比如包括1个字节。
具体地，TIM帧的结构可以如图3所示。
基于上述方案，本申请实施例可以兼容非多链路站点，使得非多链路站点也可以正确解析TIM帧，从而获得第一AP MLD中的所有AP对应的关键BSS参数均未发生变化。
在一种实现方式中，第一AP中的第一信息的初始值为0。
具体地，可以将第一AP MLD中的第一信息初始化为0。
在一种实施方式中，第一STA MLD中STA的第一信息的初始值为0。
具体地，可以将第一STA MLD中的第一信息初始化为0。
在另一种实施方式中，第一STA MLD中的第一信息初始值是AP提供的值，该值也可以称为初始值。
具体地，可以在建立关联的时候，第一AP在关联响应帧中向第一STA提供第一信息的值。或者，也可以在建立关联TIM广播服务时，第一AP在TIM广播响应帧中向第一STA提供第一信息的值。
下面以2的(c)所示的通信系统300为例，对本申请实施例的方法600进行具体说明。
例如，以图2的(c)为例，假设AP MLD 301(第一AP MLD的一例)中的AP2(第一AP的一例)和STA MLD302(第一STA MLD的一例)中的STA2(第一STA的一例)的信标检查字段的初始值均为0。其中，STA2为与其关联的AP2建立的TIM广播服务的站点。可选的，STA1和STA3为休眠状态。
若AP1、AP2和AP3中任一个AP的关键BSS参数发生变化，则AP2可以将信标检查字段的取值增加1，例如，AP2生成帧#1，帧#1中的信标检查字段的取值为1(第一信息的一例)。
AP2通过链路2向STA2发送帧#1，STA2接收帧#1。STA2根据帧#1中的信标检查字段的取值(1)和前一次纪录的信标检查字段的取值(0)确定AP MLD301中有至少一个AP的关键BSS参数发生变化。
对于STA MLD302中的STA，其可以通过以下方式获取变化后的关键BSS参数：
方式一：STA2通过链路2接收来自AP2的信标帧，该信标帧包括AP2对应的关键BSS参数，STA1和STA3进入醒来状态，STA1通过链路1接收来自AP1的信标帧，该信标帧包括AP1对应的关键BSS参数，STA3通过链路3接收来自AP3的信标帧，该信标帧包括AP3对应的关键BSS参数。
方式二：STA 2通过链路2向AP2发送第一帧，该第一帧用于请求STA1关联的AP1的关键BSS参数、STA2关联的AP2的关键BSS参数、STA3关联的AP3的关键BSS参数。进一步，AP2通过链路2向STA2发送第二帧，该第二帧包括AP1的关键BSS参数、AP2的关键BSS参数、AP3的关键BSS参数。例如，第一帧为多链路探测请求帧，第二帧为多链路探测响应帧。
根据上述实施例，第一AP可以通过第一信息向第一STA MLD指示第一AP MLD中至少一个AP对应的关键BSS参数是否发生变化，进一步，第一STA可以根据第一信息确定是否获取第一AP MLD的AP的关键BSS参数。通过这种方式，当第一AP MLD中至少一个AP对应的关键BSS参数发生变化时，第一STA能够及时获知，从而使得第一STA MLD和第一AP MLD能够正常通信，有助于提高通信的可靠性。
以下，结合图7至图8，说明本申请实施例提供的通信装置。
图7是本申请实施例提供的一种通信装置的示意性框图。如图7所示，该装置400可以包括收发单元410和处理单元420。收发单元410可以与外部进行通信，处理单元420用于进行数据处理。收发单元410还可以称为通信接口或通信单元。
在一种可能的设计中，该装置400可以是上文方法实施例中的第一AP MLD设备，也可以是用于实现上文方法实施例中第一AP MLD设备的功能的芯片。或者，该装置400可以是上述第一AP MLD的第一AP，也可以是用于实现上述第一AP MLD的第一AP的功能的芯片。
具体地，该装置包括：处理单元420，用于生成第一信息，该第一信息用于指示该装置中的至少一个AP对应的关键BSS参数是否发生变化；收发单元410，用于向第一STA MLD发送该第一信息。
可选地，该第一信息为计数值。
可选地，若该装置中的至少一个AP对应的关键BSS参数发生变化，则第一信息的取值增加。
可选地，若装置中的所有AP对应的关键BSS参数均未发生变化，则第一信息的取值不变。
可选地，第一信息承载于信标检查字段。
可选地，信标检查字段承载于业务指示位图TIM帧。
可选地，第一信息用于指示该装置中的至少一个AP对应的关键BSS参数发生变化，该收发单元410还用于：接收来自第一STA的第一帧，该第一帧用于请求第二STA关联的AP对应的关键BSS参数，该第二STA为第一STA MLD中与该装置关联的站点；向该第一STA发送第二帧，该第二帧包括第二STA关联的AP对应的关键BSS参数。
可选地，该第二STA为第一STA MLD中的所有STA。
可选地，该关键BSS参数包括以下一项或多项：包括信道变更通知元素、包括拓展信道变更通知元素、更改增强分布式信道接入EDCA参数元素、包括静态元素、修改直接序列扩频DSSS参数集合、修改免竞争CF参数集合元素、修改高吞吐量HT操作元素、包括宽带宽信道更变元素、包括宽带宽信道更变封套元素、包括操作模式通知元素、包括静态信道元素、修改非常高吞吐量VHT操作元素、修改高效HE操作元素、插入广播TWT元素、包括BSS颜色变更通知元素、修改多用户EDCA参数集合元素、修改空间复用参数集合元素、修改极高吞吐量操作元素。
示例性地，上述的收发单元410可以分为接收单元和发送单元，其中，接收单元用于执行上文方法实施例中第一AP MLD的接收相关的操作，发送单元用于执行上文方法实施例中第一AP MLD的发送相关的操作。
应理解，上述内容仅作为示例性理解，该装置400还能够实现上述方法实施例中的其他与第一AP MLD相关的步骤、动作或者方法，在此不再赘述。
在另一种可能的设计中，该装置400可以是上文方法实施例中的第一STA MLD设备，也可以是用于实现上文方法实施例中第一STA MLD设备的功能的芯片。或者，该装置400可以是上述第一STAMLD的第一STA和/或第二STA，也可以是用于实现上述第一STAMLD的第一STA和/或第二STA的功能的芯片。
具体地，该装置可以包括：收发单元410，用于接收第一信息，该第一信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化；处理单元420，用于根据第一信息确定第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化。
可选地，该第一信息为计数值。
可选地，处理单元420还用于：记录第一信息。
可选地，处理单元420具体用于：根据第一信息的取值和第二信息的取值是否相同确定第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化，其中，该第二信息为该装置接收第一信息的前一次接收到的信息，且该第二信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化。
可选地，处理单元420具体用于：若第一信息的取值和第二信息的取值相同，则确定第一AP MLD中的所有AP对应的关键BSS参数均未发生变化；和/或，若第一信息的取值和第二信息的取值不同，则确定第一AP MLD中的至少一个AP对应的关键BSS参数发生变化。
可选地，该第一信息的取值和第二信息的取值不同，该装置还包括：第一收发单元，用于接收信标帧，该信标帧包括第二STA关联的AP对应的关键BSS参数，该第二STA为该装置中与第一AP MLD关联的站点。
可选地，该第一信息的取值和第二信息的取值不同，收发单元410还用于：发送第一帧，该第一帧用于请求第二STA关联的AP对应的关键BSS参数，该第二STA为该装置中与第一AP MLD关联的站点；接收第二帧，该第二帧包括第二STA关联的AP对应的关键BSS参数。
可选地，该第二STA为该装置中的所有STA。
可选地，该第一信息承载于信标检查字段。
可选地，该信标检查字段承载于业务指示位图TIM帧。
可选地，该关键BSS参数包括以下一项或多项：包括信道变更通知元素、包括拓展信道变更通知元素、更改EDCA参数元素、包括静态元素、修改DSSS参数集合、修改CF参数集合元素、修改HT操作元素、包括宽带宽信道更变元素、包括宽带宽信道更变封套元素、包括操作模式通知元素、包括静态信道元素、修改VHT操作元素、修改HE操作元素、插入广播TWT元素、包括BSS颜色变更通知元素、修改多用户EDCA参数集合元素、修改空间复用参数集合元素、修改极高吞吐量操作元素。
示例性地，上述的收发单元410可以分为接收单元和发送单元，其中，接收单元用于执行上文方法实施例中第一STA MLD的接收相关的操作，发送单元用于执行上文方法实施例中第一STA MLD的发送相关的操作。
应理解，这里的装置400以功能单元的形式体现。这里的术语“单元”可以指应用特有集成电路(application specific integrated circuit，ASIC)、电子电路、用于执行一个或多个软件或固件程序的处理器(例如共享处理器、专有处理器或组处理器等)和存储器、合并逻辑电路和/或其它支持所描述的功能的合适组件。
应理解，上述内容仅作为示例性理解，该装置400还能够实现上述方法实施例中的其他与第一STA MLD相关的步骤、动作或者方法，在此不再赘述。
图8是本申请实施例提供的一种通信设备500的示意性框图。如图8所示，该通信设 备500包括：至少一个处理器510和收发器520。该处理器510与存储器耦合，用于执行存储器中存储的指令，以控制收发器520发送信号和/或接收信号。可选地，该通信设备500还包括存储器530，用于存储指令。
应理解，上述处理器510和存储器530可以合成一个处理装置，处理器510用于执行存储器530中存储的程序代码来实现上述功能。具体实现时，该存储器530也可以集成在处理器510中，或者独立于处理器510。
还应理解，收发器520可以包括接收器(或者称，接收机)和发射器(或者称，发射机)。收发器520还可以进一步包括天线，天线的数量可以为一个或多个。收发器1020有可以是通信接口或者接口电路。
当该通信设备500为芯片时，该芯片包括收发单元和处理单元。其中，收发单元可以是输入输出电路或通信接口；处理单元可以为该芯片上集成的处理器或者微处理器或者集成电路。
本申请实施例还提供了一种处理装置，包括处理器和接口。所述处理器可用于执行上述方法实施例中的方法。
应理解，上述处理装置可以是一个芯片。例如，该处理装置可以是现场可编程门阵列(field programmable gate array，FPGA)，可以是专用集成芯片(application specific integrated circuit，ASIC)，还可以是系统芯片(system on chip，SoC)，还可以是中央处理器(central processor unit，CPU)，还可以是网络处理器(network processor，NP)，还可以是数字信号处理电路(digital signal processor，DSP)，还可以是微控制器(micro controller unit，MCU)，还可以是可编程控制器(programmable logic device，PLD)或其他集成芯片。
在实现过程中，上述方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
本申请实施例还提供一种计算机可读存储介质，其上存储有用于实现上述方法实施例中由第一AP MLD或第一STA MLD执行的方法的计算机指令。
本申请实施例还提供一种包含指令的计算机程序产品，该指令被计算机执行时使得该计算机实现上述方法实施例中由第一AP MLD或第一STA MLD执行的方法。
本申请还提供一种系统，其包括前述的第一AP MLD或第一STA MLD。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另 一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，固态硬盘(solid state disk，SSD))等。
在本申请实施例中，“示例的”、“例如”等词用于表示作例子、例证或说明。本申请中被描述为“示例”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用示例的一词旨在以具体方式呈现概念。
应理解，说明书通篇中提到的“实施例”意味着与实施例有关的特定特征、结构或特性包括在本申请的至少一个实施例中。因此，在整个说明书各个实施例未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。本申请中所有节点、消息的名称仅仅是本申请为描述方便而设定的名称，在实际网络中的名称可能不同，不应理解本申请限定各种节点、消息的名称，相反，任何具有和本申请中用到的节点或消息具有相同或类似功能的名称都视作本申请的方法或等效替换，都在本申请的保护范围之内。
还应理解，在本申请中，“当…时”、“若”以及“如果”均指在某种客观情况下UE或者基站会做出相应的处理，并非是限定时间，且也不要求UE或基站实现时一定要有判断的动作，也不意味着存在其它限定。
需要说明的是，本申请实施例中，“预先设定”、“预先配置”等可以通过在设备(例如，终端设备)中预先保存相应的代码、表格或其他可用于指示相关信息的方式来实现，本申请对于其具体的实现方式不做限定，例如本申请实施例中预设的规则、预设的常数等。
另外，本文中术语“系统”和“网络”在本文中常被可互换使用。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。
本文中术语“……中的至少一个”或“……中的至少一种”，表示所列出的各项的全部或任意组合，例如，“A、B和C中的至少一种”，可以表示：单独存在A，单独存在B，单独存在C，同时存在A和B，同时存在B和C，同时存在A、B和C这六种情况。本文中的“至少一个”表示一个或者多个。“多个”表示两个或者两个以上。
应理解，在本申请各实施例中，“与A相应的B”表示B与A相关联，根据A可以确定B。但还应理解，根据A确定B并不意味着仅仅根据A确定B，还可以根据A和/或其它信息确定B。术语“包括”、“包含”、“具有”及它们的变形都意味着“包括但不限于”，除非是以其他方式另外特别强调。
应理解，在本申请的各种实施例中，第一、第二以及各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围。例如，区分不同的信息等。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以 硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (25)

  1. 一种通信的方法，其特征在于，包括：
    第一接入点多链路设备AP MLD的第一接入点AP生成第一信息，所述第一信息用于指示所述第一AP MLD中的至少一个AP对应的关键基本服务集BSS参数是否发生变化；
    所述第一AP向第一站点多链路设备STA MLD发送所述第一信息。
  2. 根据权利要求1所述的方法，其特征在于，所述第一信息为计数值。
  3. 根据权利要求1或2所述的方法，其特征在于，若所述第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，则所述第一信息的取值增加。
  4. 根据权利要求1或2所述的方法，其特征在于，若所述第一AP MLD中的所有AP对应的关键BSS参数均未发生变化，则所述第一信息的取值不变。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述第一信息承载于信标检查字段。
  6. 根据权利要求5所述的方法，其特征在于，所述信标检查字段承载于业务指示位图TIM帧。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，所述第一信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数发生变化，所述方法还包括：
    所述第一AP接收第一帧，所述第一帧用于请求第二STA关联的AP对应的关键BSS参数，所述第二STA为所述第一STA MLD中与所述第一AP MLD关联的站点；
    所述第一AP发送第二帧，所述第二帧包括所述第二STA关联的AP对应的关键BSS参数。
  8. 根据权利要求7所述的方法，其特征在于，所述第二STA为所述第一STA MLD中的所有STA。
  9. 根据权利要求1至8中任一项所述的方法，其特征在于，所述关键BSS参数包括以下一项或多项：包括信道变更通知元素、包括拓展信道变更通知元素、更改增强分布式信道接入EDCA参数元素、包括静态元素、修改直接序列扩频DSSS参数集合、修改免竞争CF参数集合元素、修改高吞吐量HT操作元素、包括宽带宽信道更变元素、包括宽带宽信道更变封套元素、包括操作模式通知元素、包括静态信道元素、修改非常高吞吐量VHT操作元素、修改高效HE操作元素、插入广播TWT元素、包括BSS颜色变更通知元素、修改多用户EDCA参数集合元素、修改空间复用参数集合元素、修改极高吞吐量操作元素。
  10. 一种通信的方法，其特征在于，包括：
    第一STA MLD的第一STA接收第一信息，所述第一信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化；
    所述第一STA根据所述第一信息确定所述第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化。
  11. 根据权利要求10所述的方法，其特征在于，所述第一信息为计数值。
  12. 根据权利要求10或11所述的方法，其特征在于，所述方法还包括：
    所述第一STA记录所述第一信息。
  13. 根据权利要求10至12中任一项所述的方法，其特征在于，所述第一STA根据所述第一信息确定所述第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化，包括：
    所述第一站点根据所述第一信息的取值和第二信息的取值是否相同确定所述第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化，
    其中，所述第二信息为所述第一STA接收所述第一信息的前一次接收到的信息，且所述第二信息用于指示第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化。
  14. 根据权利要求13所述的方法，其特征在于，所述第一站点根据所述第一信息的取值和第二信息的取值是否相同确定所述第一AP MLD中的至少一个AP对应的关键BSS参数是否发生变化，包括：
    若所述第一信息的取值和所述第二信息的取值相同，则所述第一STA确定所述第一AP MLD中的所有AP对应的关键BSS参数均未发生变化；和/或，
    若所述第一信息的取值和所述第二信息的取值不同，则所述第一STA确定所述第一AP MLD中的至少一个AP对应的关键BSS参数发生变化。
  15. 根据权利要求13或14所述的方法，其特征在于，所述第一信息的取值和所述第二信息的取值不同，所述方法还包括：
    所述第一STA MLD的第二STA接收信标帧，所述信标帧包括所述第二STA关联的AP对应的关键BSS参数，所述第二STA为所述第一STA MLD中与所述第一AP MLD关联的站点。
  16. 根据权利要求13或14所述的方法，其特征在于，所述第一信息的取值和所述第二信息的取值不同，所述方法还包括：
    所述第一STA发送第一帧，所述第一帧用于请求第二STA关联的AP对应的关键BSS参数，所述第二STA为所述第一STA MLD中与第一AP MLD关联的站点；
    所述第一站点接收第二帧，所述第二帧包括所述第二STA关联的AP对应的关键BSS参数。
  17. 根据权利要求15或16所述的方法，其特征在于，所述第二STA为所述第一STA MLD中的所有STA。
  18. 根据权利要求10至17中任一项所述的方法，其特征在于，所述第一信息承载于信标检查字段。
  19. 根据权利要求18所述的方法，其特征在于，所述信标检查字段承载于业务指示位图TIM帧。
  20. 根据权利要求10至19中任一项所述的方法，其特征在于，所述关键BSS参数包括以下一项或多项：包括信道变更通知元素、包括拓展信道变更通知元素、更改EDCA参数元素、包括静态元素、修改DSSS参数集合、修改CF参数集合元素、修改HT操作元素、包括宽带宽信道更变元素、包括宽带宽信道更变封套元素、包括操作模式通知元素、包括静态信道元素、修改VHT操作元素、修改HE操作元素、插入广播TWT元素、包括BSS颜色变更通知元素、修改多用户EDCA参数集合元素、修改空间复用参数集合元素、 修改极高吞吐量操作元素。
  21. 一种通信装置，其特征在于，包括：用于实现如权利要求1至9中任意一项所述的方法的单元或模块，或用于实现如权利要求10至20中任意一项所述的方法的单元或模块。
  22. 一种通信装置，其特征在于，包括：
    存储器，用于存储计算机指令；
    处理器，用于执行所述存储器中存储的计算机指令，使得所述通信装置执行如权利要求1至9中任一项所述的方法，或使得所述通信装置执行如权利要求10至20中任一项所述的方法。
  23. 一种芯片，其特征在于，包括：处理器和接口，用于从存储器中调用并运行所述存储器中存储的计算机程序，以执行如权利要求1至9中任一项所述的方法，或执行如权利要求10至20中任一项所述的方法。
  24. 一种计算机可读存储介质，其特征在于，用于存储计算机程序，所述计算机程序包括用于实现如权利要求1至9中任一项所述的方法的指令，或包括用于实现如权利要求10至20中任一项所述的方法的指令。
  25. 一种计算机程序产品，其特征在于，包括计算机程序代码，当所述计算机程序代码在计算机上运行时，使得计算机实现如权利要求1至9中任一项所述的方法或使得所述计算机实现如权利要求10至20中任一项所述的方法。
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