Method for transmitting or receiving frame in wireless lan system, and device therefor

A station (STA) transmitting a frame comprising a buffer status report (BSR) in a wireless local area network (WLAN) system, the STA comprising:

• a processor to configure a BSR of the STA in a first control subfield among one or two or more control subfields aggregated in an aggregated (A)-control field;
• and
• a transmitter to transmit the A-control field through a high throughput (HT) control field included in an MAC header of a frame under control of the processor,
• wherein the first control subfield for the BSR comprises at least one of first information indicating an access category of traffic buffered in the STA, second information indicating a size of the buffered traffic, third information indicating a unit of the second information, fourth information indicating a number of traffic identifiers (TIDs), fifth information indicating an access category of particular traffic of the buffered traffic, and sixth information indicating a size of the particular traffic, and
• wherein when a second control subfield of the A-control field comprises uplink power headroom information about the STA, the first control subfield for the BSR is configured as a short BSR in which the fifth information and the sixth information are omitted.

A method in which an access point (AP) receives a frame comprising a buffer status report (BSR) in a wireless local area network (WLAN) system, the method comprising:

• receiving an A-control field through a high throughput (HT) control field included in an MAC header of a frame;
• and
• obtaining a BSR of a station (STA) via a first control subfield among one or two or more control subfields aggregated in an aggregated (A)-control field,
• wherein the first control subfield for the BSR comprises at least one of first information indicating an access category of traffic buffered in the STA, second information indicating a size of the buffered traffic, third information indicating a unit of the second information, fourth information indicating a number of traffic identifiers (TIDs), fifth information indicating an access category of particular traffic of the buffered traffic, and sixth information indicating a size of the particular traffic, and
• wherein when a second control subfield of the A-control field comprises uplink power headroom information about the STA, the first control subfield for the BSR is configured as a short BSR in which the fifth information and the sixth information are omitted.