Method and apparatus for initial access distribution over wireless LAN

1. A method for performing an initial access of a station (STA), the method comprising:

reporting, by the STA, information for determining a Fast Initial Link Setup (FILS) backoff parameter to an access point (AP), wherein the FILS backoff parameter is determined based on the information, and wherein the information includes an access category of a traffic data, backoff retry count information, packet retransmission count information and latest backoff interval information;

receiving, by the STA, the FILS backoff parameter from the AP, wherein the FILS backoff parameter includes a size of a Contention Window (CW) and an Arbitration Inter-Frame Space Number (AIFSN), and

performing, by the STA, a backoff procedure based on the size of the CW and the AIFSN determined by the information.

2. The method of claim 1 ,

wherein the AIFSN and the size of the CW included in the FILS backoff parameter decrease when a priority of the access category increases.

3. The method of claim 1 , further comprising:

receiving, by the STA, an FILS access distribution indication parameter from the AP; and

determining, based on the FILS access distribution indication parameter, whether the STA performs a backoff procedure based on a final FILS backoff parameter,

wherein the FILS access distribution indication parameter includes information on whether the STA performs the backoff procedure based on the final FILS backoff parameter.

4. The method of claim 3 ,

wherein determining, based on the FILS access distribution indication parameter, whether the STA performs a backoff procedure based on the final FILS backoff parameter includes:

when the FILS access distribution indication parameter is 1, performing, by the STA, the backoff procedure based on the final FILS backoff parameter; and

when the FILS access distribution indication parameter is 0, performing, by the STA, the backoff procedure based on a default backoff parameter.

5. A station (STA) of a wireless LAN system, the STA comprising:

a radio frequency (RF) unit receiving a radio signal; and

a processor operatively connected with the RF unit that:

reports information for determining a Fast Initial Link Setup (FILS) backoff parameter to an Access Point (AP), wherein the FILS backoff parameter is determined based on the information, and wherein the information includes an access category of a traffic data, backoff retry count information, packet retransmission count information and latest backoff interval information;

controls the RF unit to receive the FILS backoff parameter from the AP, wherein the FILS backoff parameter includes a size of a Contention Window (CW) and an Arbitration Inter-Frame Space Number (AIFSN), and

performs a backoff procedure based on the size of the CW and the AIFSN determined by the information.

6. The STA of claim 5 ,

wherein the AIFSN and the size of the CW included in the FILS backoff parameter decrease when a priority of the access category increases.

7. The STA of claim 5 ,

wherein the processor:

controls the RF unit to receive, by the STA, an FILS access distribution indication parameter from the AP, and

determines, based on the FILS access distribution indication parameter, whether the STA performs a backoff procedure based on a final FILS backoff parameter,

wherein the FILS access distribution indication parameter includes information on whether the STA performs the backoff procedure based on the final FILS backoff parameter.

8. The STA of claim 7 ,

wherein the processor:

performs, when the FILS access distribution indication parameter is 1, the backoff procedure based on the final FILS backoff parameter and,

performs, when the FILS access distribution indication parameter is 0, the backoff procedure based on a default backoff parameter.