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CN-116133043-B - Multilink communication method, device and readable storage medium

CN116133043BCN 116133043 BCN116133043 BCN 116133043BCN-116133043-B

Abstract

The application relates to the field of wireless communication, and is applied to a wireless local area network supporting 802.11 series standards, in particular to a multi-link communication method, a device and a readable storage medium, wherein the method comprises the following steps: the AP MLD generates a first frame including a supported rate and BSS membership selector element therein including first indication information indicating that the non-AP MLD is prohibited from initiating a multilink establishment with the AP MLD on the first link, and transmits the first frame on the first link. By adopting the embodiment of the application, the low-delay service on the link (namely cleanlink) which only allows the TID mapping corresponding to the low-delay service is not interfered by the non-low-delay service.

Inventors

  • HUANG GUOGANG
  • GAN MING
  • GUO YUCHEN
  • LI YUNBO

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260505
Application Date
20211115

Claims (20)

  1. 1. A method of multilink communication, comprising: Generating a first frame by an access point multi-link device (AP) MLD, wherein the first frame comprises a supported rate and Basic Service Set (BSS) membership selector element, and the supported rate and BSS membership selector element comprises first indication information, wherein the first indication information is used for indicating a non-access point multi-link device (non-AP) MLD to prohibit initiating multi-link establishment with the AP MLD on a first link; the AP MLD transmits the first frame on the first link.
  2. 2. The method of claim 1, wherein the AP MLD has at least two links, the at least two links including the first link and the second link; The method further comprises the steps of: the AP MLD sends a beacon frame or a detection response frame on the second link, wherein the beacon frame or the detection response frame comprises a simplified neighbor report (RNR) element, the RNR element comprises a neighbor AP information field corresponding to a first access point, a channel number field in the neighbor AP information field is set to 0, and the first access point is an access point in the AP MLD working on the first link.
  3. 3. The method of claim 1, wherein the first indication information is further used to indicate that a station that is single-link and supports a very high throughput protocol is prohibited from establishing an association with the AP MLD on the first link.
  4. 4. A method according to any of claims 1-3, wherein the first indication information is a BSS membership selector in the supported rate and BSS membership selector element being set to a preset value.
  5. 5. The method of any one of claims 1-3, wherein the first frame is any one of a beacon frame, a probe response frame, an association response frame, and a reassociation response frame.
  6. 6. A method according to any of claims 1-3, wherein the first frame is an association response frame or a re-association response frame, and wherein the first frame further comprises a quality of service QoS mapping element, the QoS mapping element comprising respective differentiated services coding point DSCP range fields corresponding to 8 different user priorities, the DSCP range indicated by the DSCP range field corresponding to m of the 8 different user priorities covering a DSCP space, the DSCP space being an interval [0,63], m being a positive integer less than 8; The DSCP low value field and the DSCP high value field in the DSCP range field corresponding to the other (8-m) user priorities among the 8 different user priorities are each set to 255.
  7. 7. The method of claim 6, wherein the AP MLD after transmitting the first frame on the first link, the method further comprises: The AP MLD receives a Stream Classification Service (SCS) request frame, wherein the SCS request frame comprises an SCS identifier field, and the SCS identifier field is used for indicating the reported SCS stream; The AP MLD transmits an SCS response frame, which includes a status code field for indicating whether the AP MLD accepts the SCS stream.
  8. 8. The method of claim 7 wherein when the status codeword segment indicates that the AP MLD accepts the SCS stream, further comprising a TID-to-link mapping element in the SCS response frame, the TID-to-link mapping element to indicate TID mapping rules.
  9. 9. The method of claim 8, wherein the method further comprises: The AP MLD sends a data packet, wherein when the data packet is not matched with SCS flow, the TID of the data packet is set according to the QoS mapping element, and when the data packet is matched with SCS flow, the TID of the data packet is set according to the TID carried in the SCS response frame to the link mapping element.
  10. 10. A method of multilink communication, comprising: the non-access point multi-link device non-AP MLD receives a first frame on a first link; The non-AP MLD parses the first frame, the first frame including supported rate and BSS membership selector elements, the supported rate and BSS membership selector elements including first indication information indicating that the non-AP MLD is prohibited from initiating a multi-link setup with an access point multi-link device AP MLD on a first link.
  11. 11. The method according to claim 10, wherein the method further comprises: The non-AP MLD receives a beacon frame or a probe response frame on a second link, wherein the beacon frame or the probe response frame comprises a simplified neighbor report (RNR) element, the RNR element comprises a neighbor AP information field corresponding to a first access point, a channel number field in the neighbor AP information field is set to 0, and the first access point is an access point in the AP MLD working on the first link.
  12. 12. The method of claim 11, wherein the first indication information is further used to indicate that a station that is single-link and supports a very high throughput protocol is prohibited from establishing an association with the AP MLD on the first link.
  13. 13. The method according to any of claims 11-12, wherein the first indication information is a BSS membership selector in the supported rate and BSS membership selector element being set to a preset value.
  14. 14. The method according to any one of claims 11-12, wherein the first frame is any one of a beacon frame, a probe response frame, an association response frame, a re-association response frame.
  15. 15. The method according to any of claims 11-12, wherein the first frame is an association response frame or a re-association response frame, and wherein the first frame further comprises a quality of service QoS mapping element, the QoS mapping element comprising respective differentiated services coding point DSCP range fields corresponding to 8 different user priorities, wherein the DSCP range indicated by the DSCP range field corresponding to m user priorities of the 8 different user priorities covers a DSCP space, and wherein the DSCP space is an interval [0,63], and m is a positive integer less than 8; The DSCP low value field and the DSCP high value field in the DSCP range field corresponding to the other (8-m) user priorities among the 8 different user priorities are each set to 255.
  16. 16. The method of claim 15, wherein after the non-AP MLD parses the first frame, the method further comprises: the non-AP MLD sends a Stream Classification Service (SCS) request frame, wherein the SCS request frame comprises an SCS identifier field, and the SCS identifier field is used for indicating the reported SCS stream; The non-AP MLD receives an SCS response frame, wherein the SCS response frame comprises a status code field, and the status code field is used for indicating whether the AP MLD accepts the SCS stream or not.
  17. 17. The method of claim 16 wherein when the status codeword segment indicates that the AP MLD accepts the SCS stream, further comprising a TID-to-link mapping element in the SCS response frame, the TID-to-link mapping element to indicate TID mapping rules.
  18. 18. The method of claim 17, wherein the method further comprises: and when the data packet is matched with the SCS stream, the TID of the data packet is set according to the TID-to-link mapping element carried in the SCS response frame.
  19. 19. A method of multilink communication, comprising: The method comprises the steps that an AP MLD sends a beacon frame on a first link, wherein the beacon frame comprises a supported rate and BSS membership selector element, the supported rate and BSS membership selector element comprises first indication information, and the first indication information is used for indicating a first non-AP MLD to prohibit a multi-link establishment with the AP MLD from being initiated on the first link; The AP MLD sends a BSS transfer management request frame on the first link, wherein the BSS transfer management request frame comprises second indication information, the second indication information is used for indicating a second non-AP MLD associated with the AP MLD to ignore the BSS transfer management request frame, the BSS transfer management request frame is used for requesting a first station associated with a first access point to carry out BSS transfer, the first access point is an access point working on the first link in the AP MLD, and the first station only supports a protocol before an extremely high throughput rate protocol.
  20. 20. The method of claim 19, wherein the first indication information is further used to indicate that a station that is single-link and supports a very high throughput protocol is prohibited from establishing an association with the AP MLD on the first link.

Description

Multilink communication method, device and readable storage medium Technical Field The present application relates to the field of wireless communications technologies, and in particular, to a method and apparatus for multi-link communication, and a readable storage medium. Background Wireless local area networks (wireless local area network, WLAN) have evolved over many generations to date, including 802.11a/b/g, 802.11n, 802.11ac, 802.11ax, and 802.11be, etc. now under discussion. Among other things, the 802.11be standard is also referred to as the extremely high throughput (extremely high throughput, EHT) standard, wi-Fi7, etc. Low latency is an important feature of the 802.11be standard. The 802.11be standard may reduce packet latency by Multi-link (Multi-link) and traffic identifier (TRAFFIC IDENTIFIER, TID) to link mapping (TID-to-LINK MAPPING), and also allow Access Points (APs) to establish a limited target wakeup time (RESTRICTED TARGET wakeup time, RESTRICTED TWT) for transmission of low latency traffic to reduce interference of other traffic to low latency traffic, thereby reducing latency of low latency traffic. To better support the transmission of low latency traffic, a new TID-to-LINK MAPPING capability indication, called enhanced link subset mapping (ENHANCED LINK subset mapping), has been proposed. For enhanced link subset mapping, the access point multi-link device (access point multi-LINK DEVICE, AP MLD) broadcasts a TID-to-LINK MAPPING scheme in which some links only allow TID data corresponding to low latency traffic to be sent on the link and other links allow TID data corresponding to all traffic to be sent on the other links. For example, suppose that the AP MLD has 3 links, link 1, link2, and link3, respectively, and TID 6 and TID 7 are TIDs used for low latency traffic. The AP MLD may broadcast a TID-to-LINK MAPPING scheme as shown in table 1 below (the symbol "v" in table 1 may indicate allowed mapping and the symbol "x" may indicate not allowed mapping), where link3 only allows TID mapping for low latency traffic onto the link, which link3 is referred to as a clean link (CLEAN LINK). How to establish a link (i.e., CLEAN LINK) that only allows TID mapping for low latency traffic so that low latency traffic on the link is not interfered by non-low latency traffic has not been addressed. TABLE 1 TID 0TID 1TID 2TID 3TID 4TID 5TID 6TID 7link 1√√√√√√√√link 2√√√√√√√√link 3╳╳╳╳╳╳√√ Disclosure of Invention The embodiment of the application provides a multilink communication method, a device and a readable storage medium, which can ensure that low-delay service on a link (namely CLEAN LINK) which only allows TID mapping corresponding to low-delay service is not interfered by non-low-delay service. The application is described below in terms of various aspects, with the understanding that the embodiments and advantages of the various aspects below may be referenced to one another. In a first aspect, the present application provides a method of multilink communication comprising an AP MLD generating a first frame and transmitting the first frame on a first link, the first frame including a supported rate and Basic Service Set (BSS) membership selector element (supported rates and BSS membership selector element) therein, the supported rate and BSS membership selector element including first indication information for indicating that a non-AP MLD is prohibited from initiating a multilink setup with the AP MLD on the first link. Wherein the AP MLD has at least two links including a first link and a second link. The first link is a link that only allows transmission of low-latency traffic or only allows TID mapping corresponding to low-latency traffic, i.e., the first link is CLEAN LINK. It should be appreciated that if the non-AP MLD initiates a multilink setup via CLEAN LINK, it is possible that the non-AP MLD only successfully establishes the link with the AP MLD (i.e., CLEAN LINK), then the non-AP MLD may have both low latency traffic and non-low latency traffic on the link, and then the link may not transmit only low latency traffic. Therefore, the indication information is carried in Supported Rates and BSS Membership Selector elements and is used for indicating that the non-AP MLD is not allowed to initiate the establishment of multiple links on CLEAN LINK, and the non-AP MLD must establish the links through other links of the AP MLD to prevent the non-AP MLD from being established with the AP MLD only successfully CLEAN LINK, so that the low-delay service on CLEAN LINK is not interfered by the non-low-delay service. With reference to the first aspect, in a possible implementation manner, the method further includes that the AP MLD sends a beacon frame or a probe response frame on the second link, where the beacon frame or the probe response frame includes a reduced neighbor report element (reduced neighbor report element, RNR ELEMENT), the RNR element includes a neighbor AP information