EP-4738968-A1 - METHOD AND DEVICE FOR PERFORMING R-TWT RELATED NOTIFICATION IN MULTI-BSS ENVIRONMENT IN WIRELESS LAN SYSTEM

Abstract

Disclosed are a method and a device for performing an R-TWT related notification in a multi-BSS environment in a wireless LAN system. A method performed by a station (STA) in a wireless LAN system according to an embodiment of the present disclosure may comprise the steps of: receiving a frame including a notification related to a restricted TWT (R-TWT) service period (SP) from a first access point (AP) associated with the STA; and performing a related operation for the R-TWT SP. Here, on the basis that a first R-TWT SP scheduled by the first AP and a second R-TWT SP scheduled by a second AP not associated with the STA do not overlap in the time domain, the notification may include both information related to the first R-TWT SP and information related to the second R-TWT SP.

Inventors

• BAEK, Sunhee
• CHOI, JINSOO
• JANG, Insun
• KIM, Geonhwan
• YOON, Yelin
• CHA, Dongju

Assignees

• LG Electronics Inc.

Dates

Publication Date

20260506

Application Date

20240628

Claims (20)

1. A method performed by a station (STA) in a wireless LAN system, the method comprising: receiving, by the STA associated with a first access point (AP) of a first basic service set (BSS), a frame transmitted from a second AP of a second BSS; based on the frame including information for a restricted target wake time (R-TWT) service period (SP) scheduled by the second AP, transmitting, to the first AP, information for one or more time intervals being non-overlapped with the R-TWT SP; and receiving, from the first AP, scheduling information for the STA based on the information for the one or more time intervals.
2. The method of claim 1, wherein: the information for the one or more time intervals is included in a TWT element within a TWT setup frame for a TWT request.
3. The method of claim 2, wherein: information related to whether there is overlap with the R-TWT SP is included in a control field included in the TWT element within the TWT setup frame.
4. The method of claim 2, wherein: information related to whether there is overlap with the R-TWT SP is included in a broadcast TWT parameter set field included in the TWT element within the TWT setup frame.
5. The method of claim 4, wherein: information related to whether there is overlap with the R-TWT SP is configured, within the broadcast TWT parameter set field, together with at least one of a first field indicating whether there is coordination between APs for the R-TWT SP, a second field indicating a BSS color value of an AP that schedules the R-TWT SP, a third field indicating whether a protection operation for the R-TWT SP is performed, or a fourth field indicating a broadcast TWT ID corresponding to the R-TWT SP.
6. The method of claim 2, wherein: information related to whether there is overlap with the R-TWT SP is included in an element following the TWT element within the TWT setup frame.
7. The method of claim 1, wherein: the scheduling information for the STA includes information for a TWT SP allocated to and announced for the STA or information for an R-TWT SP.
8. The method of claim 1, wherein: the R-TWT SP is regarded as an R-TWT SP that is not coordinated between the first AP and the second AP.
9. A first station (STA) device in a wireless local area network (WLAN) system, the device comprising: at least one transceiver; and at least one processor connected to the at least one transceiver, wherein the at least one processor is configured to: receive, by the first STA associated with a first access point (AP) of a first basic service set (BSS), a frame transmitted from a second AP of a second BSS; based on the frame including information for a restricted target wake time (R-TWT) service period (SP) scheduled by the second AP, transmit, to the first AP, information for one or more time intervals being non-overlapped with the R-TWT SP; and receive, from the first AP, scheduling information for the STA based on the information for the one or more time intervals.
10. A method performed by a first access point (AP) in a wireless LAN system, the method comprising: receiving, from an STA associated with the first AP of a first basic service set (BSS), information for one or more time intervals that do not overlap with a restricted target wake time (R-TWT) service period (SP) scheduled by a second AP of a second BSS; and allocating and announcing scheduling information for the STA based on the information for the one or more time intervals.
11. A first access point (AP) device in a wireless local area network (WLAN) system, the device comprising: at least one transceiver; and at least one processor connected to the at least one transceiver, wherein the at least one processor is configured to: receive, from an STA associated with the first AP of a first basic service set (BSS), information for one or more time intervals that do not overlap with a restricted target wake time (R-TWT) service period (SP) scheduled by a second AP of a second BSS; and allocate and announce scheduling information for the STA based on the information for the one or more time intervals.
12. A method performed by a station (STA) in a wireless LAN system, the method comprising: receiving, from a first access point (AP) with which the STA is associated, a frame including an announcement related to a restricted target wake time (R-TWT) service period (SP); and performing a related operation for the R-TWT SP, wherein, based on a first R-TWT SP scheduled by the first AP and a second R-TWT SP scheduled by a second AP with which the STA is not associated not overlapping in a time domain, the announcement includes both information related to the first R-TWT SP and information related to the second R-TWT SP.
13. The method of claim 12, wherein: based on the first R-TWT SP scheduled by the first AP and the second R-TWT SP scheduled by the second AP with which the STA is not associated overlapping in the time domain, the announcement includes information related to the first R-TWT SP.
14. The method of claim 12, wherein: the announcement further includes scheduling information for the second R-TWT SP and additional information.
15. The method of claim 14, wherein: the additional information includes information indicating whether there is coordination between the first AP and the second AP for the second R-TWT SP.
16. The method of claim 15, wherein: whether there is coordination for the second R-TWT SP is based on whether negotiation between the first AP and the second AP has been successfully completed, or whether the second R-TWT SP has been allocated by an entity managing the first AP and the second AP.
17. The method of claim 14, wherein: the additional information includes indication information indicating whether to follow a protection rule of terminating a transmission opportunity (TXOP) before a start time of the second R-TWT SP.
18. The method of claim 17, wherein: setting the indication information to a specific value indicates mandatorily following the protection rule for the second R-TWT SP, and setting the indication information to a value other than the specific value indicates conditionally following the protection rule for the second R-TWT SP.
19. The method of claim 18, wherein: based on the indication information being set to a value other than the specific value, the STA is configured to determine whether to follow the protection rule based on other information, and wherein the other information includes one or more of a BSS color value in a U-SIG field, a threshold value for received signal strength of data received from the second AP, or a value related to spatial reuse.
20. The method of claim 14, wherein: the additional information includes information indicating a BSS color value of an AP that schedules the second R-TWT SP.

Description

[TECHNICAL FIELD] The present disclosure relates to a method and apparatus for performing notification related to restricted-target wake time (R-TWT) in a multi-BSS (basic service set) environment in a Wireless Local Area Network (WLAN) system. [BACKGROUND ART] New technologies for improving transmission rates, increasing bandwidth, improving reliability, reducing errors, and reducing latency have been introduced for a wireless LAN (WLAN). Among WLAN technologies, an Institute of Electrical and Electronics Engineers (IEEE) 802.11 series standard may be referred to as Wi-Fi. For example, technologies recently introduced to WLAN include enhancements for Very High-Throughput (VHT) of the 802.11ac standard, and enhancements for High Efficiency (HE) of the IEEE 802.11ax standard. In order to provide a more advanced wireless communication environment, improved technologies for Extremely High Throughput (EHT) are being discussed. For example, technologies for MIMO and multiple access point (AP) coordination that support increased bandwidth, efficient utilization of multiple bands, and increased spatial streams are being studied, and in particular, various technologies are being studied to support low latency or real-time traffic. Furthermore, new technologies are being discussed to support ultra high reliability (UHR), including improvements or extensions of EHT technologies. [Disclosure] [Technical Problem] A technical object of the present disclosure is to provide a method and device for performing notification related to restricted-target wake time (R-TWT) in a multi-BSS (basic service set) environment in a wireless local area network (WLAN) system. The technical objects to be achieved by the present disclosure are not limited to the above-described technical objects, and other technical objects which are not described herein will be clearly understood by those skilled in the pertinent art from the following description. [Technical Solution] A method performed by a station (STA) in a wireless LAN system according to an aspect of the present disclosure may comprise: receiving, by the STA associated with a first access point (AP) of a first basic service set (BSS), a frame transmitted from a second AP of a second BSS; based on the frame including information for a restricted target wake time (R-TWT) service period (SP) scheduled by the second AP, transmitting, to the first AP, information for one or more time intervals being non-overlapped with the R-TWT SP; and receiving, from the first AP, scheduling information for the STA based on the information for the one or more time intervals. A method performed by a first access point (AP) in a wireless LAN system according to an additional aspect of the present disclosure may comprise: receiving, from an STA associated with the first AP of a first basic service set (BSS), information for one or more time intervals that do not overlap with a restricted target wake time (R-TWT) service period (SP) scheduled by a second AP of a second BSS; and allocating and announcing scheduling information for the STA based on the information for the one or more time intervals. A method performed by a station (STA) in a wireless LAN system according to an additional aspect of the present disclosure may comprise: receiving, from a first access point (AP) with which the STA is associated, a frame including an announcement related to a restricted target wake time (R-TWT) service period (SP); and performing a related operation for the R-TWT SP. Herein, based on a first R-TWT SP scheduled by the first AP and a second R-TWT SP scheduled by a second AP with which the STA is not associated not overlapping in a time domain, the announcement may include both information related to the first R-TWT SP and information related to the second R-TWT SP. A method performed by a first access point (AP) in a wireless LAN system according to an additional aspect of the present disclosure may comprise: obtaining information for a restricted target wake time (R-TWT) service period (SP) scheduled by a second AP belonging to a second basic service set (BSS) different from a first BSS to which the first AP belongs; determining whether the R-TWT SP scheduled by the second AP overlaps with an R-TWT SP scheduled by the first AP; and based on the R-TWT SP scheduled by the first AP and the R-TWT SP scheduled by the second AP not overlapping in a time domain, transmitting a frame for announcing both information related to the R-TWT SP scheduled by the first AP and information related to the R-TWT SP scheduled by the second AP. [Technical Effects] According to the present disclosure, a method and device for performing notification related to restricted-target wake time (R-TWT) in a multi-BSS (basic service set) environment in a wireless local area network (WLAN) system can be provided. Effects achievable by the present disclosure are not limited to the above-described effects, and other effects which are not described