Method and apparatus for transceiving beacon in wireless LAN system

• US 9,538,552 B2
• Filed: 04/01/2013
• Issued: 01/03/2017
• Est. Priority Date: 03/30/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Choi, Jinsoo, Han, Seunghee, Kwak, Jinsam, Seok, Yongho, Kim, Jeongki
• Primary Examiner(s): Pham, Chi H
• Assistant Examiner(s): LOPATA, ROBERT J
• Application Number:
  US14/389,581
• Publication Number:
  US 20150078229A1
• Time in Patent Office: 1,373 Days
• Field of Search: 370/311
• US Class Current: 1/1
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0241 where no transmission is received, e.g. out of range of the transmitter
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present invention relates to a wireless communication system, and more specifically discloses a method and an apparatus for transceiving a beacon in a wireless LAN system. A method for receiving a beacon from a station (STA) in a wireless communication system according to one embodiment of the present invention comprises the steps of: receiving a probe response frame from an access point (AP); determining the time at which the next beacon is to be received by means of information regarding the next beacon contained in the probe response frame; and receiving the next beacon at the time determined for receiving the next beacon.

Claims

1. A method for receiving a beacon by a station (STA) in a wireless communication system, the method comprising:

transmitting a first frame to an access point (AP);

receiving, from the AP, a second frame in response to transmitting the first frame;

determining a beacon reception time using a duration to a next target beacon transmission time (TBTT) included in the second frame, wherein the duration corresponds to a time duration from reception of the second frame to reception of the next target beacon and wherein the duration is configured by the AP when the first frame is received from the STA; and

receiving the beacon at the determined beacon reception time.

2. The method according to claim 1, wherein the STA switches to a doze state after determining the beacon reception time, and switches to an awake state before the determined beacon reception time ends.

3. The method according to claim 1, wherein the beacon is a full beacon.

4. The method according to claim 1, wherein the beacon is a short beacon.

5. The method according to claim 1, further comprising:

determining a full beacon reception time using a duration to a full beacon or next TBTT included in a received short beacon; and

receiving a full beacon at the determined full beacon reception time.

6. The method according to claim 5, wherein the STA switches to a doze state after determining the full beacon reception time , and switches to an awake state before the determined full beacon reception time ends.

7. The method according to claim 1, further comprising:

determining a full beacon reception time using at least one of short beacon count information or short beacon interval information; and

receiving a full beacon at the determined full beacon reception time.

8. The method according to claim 7, wherein the at least one of the short beacon count information or the short beacon interval information is included in the second frame or a short beacon.

9. The method according to claim 1, further comprising:

determining a full beacon reception time using at least one of short beacon number information, short beacon interval information, or short beacon index information; and

receiving a full beacon at the determined full beacon reception time.

10. The method according to claim 9, wherein the at least one of short beacon number information, short beacon interval information, or short beacon index information is included in the second frame or a short beacon.

11. The method according to claim 1, wherein the beacon is a short beacon, and wherein the short beacon includes at least one of a compressed service set identifier (SSID) field, a 4-byte timestamp, or a change sequence field.

12. The method according to claim 1, wherein the second frame includes at least one of a timestamp or an SSID.

13. A station (STA) for receiving a beacon in a wireless communication system, comprising:

a transceiver; and

a processor that;

controls the transceiver to transmit a first frame to an access point (AP),

controls the transceiver to receive, from the AP, a second frame in response to transmitting the first frame,

determines a beacon reception time using a duration to a next target beacon transmission time (TBTT) included in the second frame, wherein the duration corresponds to a time duration from reception of the second frame to reception of the next target beacon and wherein the duration is configured by the AP when the first frame is received from the STA, and

receives the beacon at the determined beacon reception time using the transceiver.