Restricted TWT operation which has been improved
The present specification proposes a method for a restricted TWT operation which has been improved and an apparatus for using the method. Particularly, according to an embodiment of the present specification, only when a specific condition is satisfied, a restricted TWT operation may be performed. Also, according to an embodiment of the present specification, an STA may determine whether or not to maintain a TXOP in progress prior to the start of a restricted TWT SP. In addition, according to an embodiment of the present specification, when the TXOP in progress is maintained prior to the start of the restricted TWT SP, the restricted TWT SP may be delayed.
1 . A method in a wireless local area network (LAN) system, the method comprising:
receiving, by a station (STA), a management frame including information for a restricted target wake time (TWT) from an access point (AP),
wherein the information includes a restricted TWT service period (SP) and a priority of latency-sensitive data transmitted and received in the restricted TWT SP; and
transmitting, by the STA, a physical protocol data unit (PPDU) including data to the AP within an obtained transmission opportunity (TXOP),
wherein the PPDU further includes a more data subfield,
wherein based on a priority of the data being lower than the priority of the latency-sensitive data, the STA terminates the TXOP before a start of the restricted TWT SP,
wherein based on a priority of the data being higher than the priority of the latency-sensitive data, the STA maintains the transmission of the data after a start time of the restricted TWT SP, and the more data subfield of the PPDU transmitted before the start time of the restricted TWT SP has a value of one (1).
2 . The method of claim 1 , wherein based on the STA maintaining the transmission of the data after the start time of the restricted TWT SP, the start time of the restricted TWT SP is postponed by a first time.
3 . The method of claim 2 , wherein the first time is a time interval from the start time of the restricted TWT SP to a time when the STA terminates the transmission of the data.
4 . The method of claim 2 , wherein based on the STA maintaining the transmission of the data after the start time of the restricted TWT SP, an end time of the restricted TWT SP is postponed by a second time.
5 . The method of claim 4 , wherein the second time is greater than or equal to zero (0) and less than or equal to the first time.
6 . The method of claim 1 , wherein the management frame includes at least one of a beacon frame format and/or a TWT response frame format.
7 . The method of claim 1 , wherein the priority is determined based on at least one of a traffic identifier (TID), an access category (AC), and/or a priority identifier.
8 . The method of claim 1 ,
wherein based on the priority of the data being lower than the priority of the latency-sensitive data, the more data subfield of the PPDU transmitted before the start time of the restricted TWT SP has a value of zero (0).
9 . The method of claim 1 , wherein the STA is included in a same basic service set (BSS) to which the AP and a specific STA transmitting/receiving the latency-sensitive data belong.
10 . The method of claim 1 , wherein the STA is a STA in which a restricted TWT operation is not set.
11 . A station (STA) in a wireless local area network (LAN) system, the STA comprising;
a memory;
a transceiver; and
a processor operatively coupled to the memory and the transceiver,
wherein the processor is adapted to:
receive a management frame including information for a restricted target wake time (TWT) from an access point (AP),
wherein the information includes a restricted TWT service period (SP) and a priority of latency-sensitive data transmitted and received in the restricted TWT SP; and
transmit a physical protocol data unit (PPDU) including data to the AP within an obtained transmission opportunity (TXOP),
wherein the PPDU further includes a more data subfield,
wherein based on a priority of the data being lower than the priority of the latency-sensitive data, the processor terminates the TXOP before a start of the restricted TWT SP,
wherein based on a priority of the data being higher than the priority of the latency-sensitive data, the processor maintains the transmission of the data after a start time of the restricted TWT SP, and the more data subfield of the PPDU transmitted before the start time of the restricted TWT SP has a value of one (1).