Method and device for reporting a buffer state for latency-sensitive traffic in a wireless local area access (LAN) system

1 . A method comprising:

transmitting, by a station (STA) to an access point (AP), a frame including a first BSR control subfield including first queue size information for first type traffic and second type traffic; and

transmitting, by the STA to the AP, a frame including a second BSR control subfield including second queue size information for the second type traffic,

wherein the second queue size information includes information on a ratio between the first queue size and the second queue size, and

wherein the second type traffic corresponds to latency sensitive traffic and the first type traffic corresponds to traffic other than the second type traffic.

2 . The method of claim 1 , wherein:

the first BSR control subfield and the second BSR control subfield are associated with different control identifier values.

3 . The method of claim 1 , wherein:

the second queue size information further includes information on an amount of the second type traffic excluding the first type traffic.

4 . The method of claim 1 , wherein:

the second BSR control subfield includes information on classification of the second type traffic.

5 . The method of claim 1 , wherein:

the second BSR control subfield further includes the first queue size information.

6 . The method of claim 1 , wherein:

the first BSR control subfield includes a delta traffic identifier (TID) subfield,

the second BSR control subfield does not include the delta TID subfield.

7 . The method of claim 1 , wherein:

a range of a TID value associated with the second type traffic is distinguished from the range of a TID value associated with the first type traffic.

8 . The method of claim 1 , wherein:

an access category (AC) of the second type traffic corresponds to a higher priority than an AC with a highest priority of the first type traffic.

9 . The method of claim 1 , wherein:

a restricted target wake time (r-TWT) service period (SP) for the STA is allocated based on the second BSR control subfield.

10 . A station (STA) comprising:

at least one transceiver; and

at least one processor coupled with the at least one transceiver,

wherein the at least one processor is configured to:

transmit, through the at least one transceiver, to an access point (AP), a frame including a first BSR control subfield including first queue size information for first type traffic and second type traffic; and

transmit, through the at least one transceiver, to the AP, a frame including a second BSR control subfield including second queue size information for the second type traffic,

wherein the second queue size information includes information on a ratio between the first queue size and the second queue size, and

wherein the second type traffic corresponds to latency sensitive traffic and the second type traffic corresponds to traffic other than the second type traffic.

11 . An access point (AP) comprising:

at least one transceiver; and

at least one processor coupled with the at least one transceiver,

wherein the at least one processor is configured to:

receive, through the at least one transceiver, from a station (STA), a frame including a first BSR control subfield including first queue size information for first type traffic and second type traffic; and

receive, through the at least one transceiver, from the STA, a frame including a second BSR control subfield including second queue size information for the second type traffic,

wherein the second queue size information includes information on a ratio between the first queue size and the second queue size, and

wherein the second type traffic corresponds to latency sensitive traffic and the first type traffic corresponds to traffic other than the second type traffic.