# US 9,521,694 B2 · Method and apparatus for initial access distribution over wireless LAN

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- Number: US 9,521,694 B2
- Document ID: US9521694B2
- Status: Granted
- Kind: B2
- Application number: 14/406,444
- Filed: 2013-06-18
- Published: 2015-05-21
- Granted: 2016-12-13
- Earliest claimed: 2012-06-18
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Giwon Park; Kiseon Ryu; Jinsam Kwak
- Web page: https://patentgrep.com/patent/US9521694B2

## CPC

- H04W 74/0875: {with assigned priorities based access}
- H04W 48/12: using downlink control channel
- H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02)
- H04W 76/00: Connection management
- H04W 28/18: Negotiating wireless communication parameters
- H04W 48/20: Selecting an access point
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Disclosed are a method and an apparatus for initial access distribution over a wireless LAN. A method for an initial access by a station (STA) comprises: a step in which the STA receives a fast initial link setup (FILS) backoff parameter from an access point (AP); and a step in which the STA implements a backoff procedure by using the final FILS backoff parameter determined on the basis of the FILS backoff parameter and an access category of the data to be transmitted by the STA. Accordingly, the initial access of the STA can be distributed.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 3)

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.

### Claim 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.

### Claim 6 (depends on 5)

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.

### Claim 7 (depends on 5)

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.

### Claim 8 (depends on 7)

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.