JP-2026514432-A - Method for Multi-AP Traffic State Exchange and Enhanced UORA Design

Abstract

Coordinated multi-AP transmission improves spectral efficiency and reduces latency. An AP may need to know the buffer/traffic status of other APs in order to cooperate with them. Several embodiments disclosed provide buffered status reports between multiple APs. Furthermore, the disclosed embodiments provide a UORA mechanism for low-latency traffic transmission using RA-RU.

Inventors

• ハンチン ロウ
• ジナン リン
• ルイ ヤン
• シアオフェイ ワン

Assignees

• インターデイジタル パテント ホールディングス インコーポレイテッド

Dates

Publication Date

20260511

Application Date

20240327

Priority Date

20230330

Claims (20)

1. The first access point (AP) sends a buffered status report pole frame to one or more APs in a group of multiple APs (MAPs), The first AP receives buffer status reports from each of the one or more APs in the MAP group, A method that includes this.
2. The method according to claim 1, wherein the first AP shares a transmission opportunity with one or more APs in the MAP group using the received buffer status report.
3. The method according to claim 1 or 2, wherein the buffer status report includes AP identifier (ID) information.
4. The method according to any one of claims 1 to 3, wherein the buffer status report includes buffer type information, total buffer size information, buffer size information for each access category, total buffer size information during the delay period, buffer size information for each access category during the delay period, or buffer size unit information.
5. The method according to any one of claims 1 to 4, wherein the buffer status report includes delay limit information.
6. The method according to any one of claims 1 to 5, wherein the buffer status report includes an access category bitmap or a traffic identifier (TID) bitmap.
7. The buffer status report pole frame is a first buffer status report pole frame, the buffer status report is a first buffer status report received from a second AP of the MAP group, and the method is The first AP transmits a second buffer status report pole frame to the third AP of the MAP group. The first AP receives the second buffer status report from the third AP, The method according to any one of claims 1 to 6, further comprising:
8. The method according to claim 7, wherein the first buffer status report pole frame is transmitted on a first 20 MHz subchannel within the overlapping operating channels of the first AP and the second AP.
9. The method according to claim 8, wherein the second buffer status report pole frame is transmitted on a second 20 MHz subchannel within the overlapping operating channels of the first AP and the third AP.
10. The method according to claim 7, wherein the first buffer status report pole frame includes an identifier for a second AP, and the second buffer status report pole frame includes an identifier for a third AP.
11. An access point (AP), One or more transmitters configured to send buffered status report pole frames to one or more APs in a multi-AP (MAP) group, One or more receivers configured to receive buffer status reports from each of the one or more APs in the MAP group, AP is equipped.
12. The AP according to claim 11, further comprising one or more processors configured to share transmission opportunities with one or more APs in the MAP group using the received buffer status report.
13. The buffer status report includes AP identifier (ID) information, as described in claim 11 or claim 12.
14. The AP according to any one of claims 11 to 13, wherein the buffer status report includes buffer type information, total buffer size information, buffer size information for each access category, total buffer size information during the delay period, buffer size information for each access category during the delay period, or buffer size unit information.
15. The AP according to any one of claims 11 to 14, wherein the buffer status report includes delay limit information.
16. The AP according to any one of claims 11 to 15, wherein the buffer status report includes an access category bitmap or a traffic identifier (TID) bitmap.
17. The buffer status report pole frame is a first buffer status report pole frame, and the buffer status report is a first buffer status report received from the second AP of the MAP group. The one or more transmitters are further configured to transmit a second buffered status report pole frame to the third AP of the MAP group. The one or more receivers are further configured to receive a second buffer status report from the third AP. AP according to any one of claims 11 to 16.
18. The AP according to claim 17, wherein the first buffer status report pole frame is transmitted on a first 20 MHz subchannel within the overlapping operating channels of the AP and the second AP.
19. The AP according to claim 18, wherein the second buffer status report pole frame is transmitted on a second 20 MHz subchannel within the overlapping operating channels of the AP and the third AP.
20. The AP according to claim 19, wherein the first buffer status report pole frame includes an identifier for a second AP, and the second buffer status report pole frame includes an identifier for a third AP.

Description

Related Applications This application claims priority to U.S. Provisional Patent Application No. 63/455,710 filed on 30 March 2023, U.S. Provisional Patent Application No. 63/537,018 filed on 7 September 2023, and U.S. Provisional Patent Application No. 63/547,025 filed on 2 November 2023, each of which is incorporated in whole by reference. Coordinated multi-access point (AP) transmission can be used to improve spectral efficiency and reduce latency. To achieve this, each AP may need to know the buffer and/or traffic status of other APs so that they can coordinate with each other. However, conventional mechanisms for requesting and reporting buffer and/or traffic status between APs may be insufficient for this purpose. Furthermore, target wake time (TWT) operation is used to allow APs and their associated stations (STAs) to negotiate a wake-up time period during which STAs can send and receive traffic, potentially enabling a "doze," or reduced power state, during such a time period. In an embodiment called trigger-enabled TWT, a trigger frame is used to schedule uplink transmissions. If a TWT member STA has low-latency traffic, it must wait for the AP to send a trigger frame to schedule its UL transmission, resulting in added delay, which may in some cases compromise quality of service (QoS) requirements for low-latency traffic. A more detailed understanding can be obtained from the following explanation, given as an example in conjunction with the attached drawings, where similar reference figures in the drawings indicate similar elements. This is a system diagram illustrating an exemplary communication system in which one or more disclosed embodiments may be implemented.This is a system diagram illustrating an exemplary wireless transceiver unit (WTRU) that may be used in the communication system shown in Figure 1A, according to an embodiment.This is a system diagram illustrating exemplary radio access network (RAN) and exemplary core network (CN) that may be used in the communication system shown in Figure 1A according to an embodiment.This is a system diagram illustrating another exemplary RAN and another exemplary CN that may be used in the communication system shown in Figure 1A according to an embodiment.This figure shows examples of individual TWT operations described in 802.11ax according to several embodiments.This figure illustrates an example of a broadcast TWT operation with an optional TBTT negotiation as described in 802.11ax, according to several embodiments.This figure shows the subchannel utilization element format in several different configurations.This is a signal flow diagram showing two schemes for APs to exchange buffer status information, according to several embodiments.This figure shows an exemplary user information field format for use in AP BSRP trigger frames, according to several embodiments.This figure shows examples of conventional and extended UORA for TWT according to several embodiments.This is a flowchart illustrating an embodiment of a method for exchanging traffic status information between APs within a MAP group. Table 1 is a non-exclusive list of acronyms that may be used in this specification. Figure 1A illustrates an exemplary communication system 100 in which one or more disclosed embodiments may be implemented. The communication system 100 may be a multiple access system that provides content such as voice, data, video, messages, and broadcasts to multiple wireless users. The communication system 100 may enable multiple wireless users to access such content by sharing system resources, including wireless bandwidth. For example, the communication system 100 may employ one or more channel access methods, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), single-carrier FDMA (SC-FDMA), zero-tail eigenword discrete Fourier transform spread OFDM (ZT UW DFT-S OFDM), eigenword OFDM (UW-OFDM), resource block filtering OFDM, filter bank multicarrier (FBMC), and similar. As shown in Figure 1A, the communication system 100 may include wireless transceiver units (WTRUs) 102a, 102b, 102c, 102d, a radio access network (RAN) 104, a core network (CN) 106, a public switched telephone network (PSTN) 108, the Internet 110, and other networks 112, but it should be understood that the disclosed embodiments intend any number of WTRUs, base stations, networks, and/or network elements. Each of the WTRUs 102a, 102b, 102c, and 102d may be any type of device configured to operate and/or communicate in a wireless environment. For example, WTRU 102a, 102b, 102c, and 102d, all sometimes referred to as stations (STAs), may be configured to transmit and/or receive radio signals and may include user equipment (UEs), mobile stations, fixed or mobile subscriber units, subscription-based units, pagers, cellular phones, personal digital assistants (PDAs), smartphones, laptops, netbooks, personal com