Method for operating in power-save mode in wireless lan system and apparatus for method

Patent metadata

Field	Value
Publication number	US-2018317173-A1
Application number	US-201615769702-A
Country	US
Kind code	A1
Filing date	Nov 18, 2016
Priority date	Nov 19, 2015
Publication date	Nov 1, 2018
Grant date	—

Abstract

A method for a station (STA), which supports a high efficiency physical layer protocol data unit (HE PPDU), for operating in a power-save (PS) mode in a wireless LAN system according to one embodiment of the present invention comprises the steps of: receiving a PPDU; decoding at least a part of the PPDU; and operating in a doze state until the end of the PPDU on the basis of the result of decoding at least a part of the PPDU, wherein if the PPDU is configured as a very high throughput (VHT) PPDU, which is a legacy format compared to the HE PPDU, and the VHT PPDU is determined to be an uplink frame transmitted to an access point (AP) by another STA belonging to the same basic service set (BSS) as the STA, then the STA can operate in a doze state until the end of the PPDU.

First claim

1 . A method for operating in a power-save (PS) mode by a station (STA) which supports a high efficiency physical layer protocol data unit (HE PPDU) in a wireless local area network (LAN) system, the method comprising:
receiving a PPDU; decoding at least a part of the PPDU; and operating in a doze state until an end of the PPDU based on a result of decoding the at least a part of the PPDU, wherein when the PPDU is configured as a very high throughput (VHT) PPDU which is a legacy format compared to the HE PPDU, and the VHT PPDU is determined to be an uplink frame transmitted to an access point (AP) from another STA belonging to a basic service set (BSS) where the STA belongs, the STA operates in the doze state until the end of the PPDU.

2 . The method according to claim 1 , wherein the STA determines whether to operate in the doze state by considering whether a VHT signal (SIG) field of the VHT PPDU includes a part of a BSSID of the BSS with which the STA is associated.

3 . The method according to claim 2 , wherein when a partial association ID (PAID) included in the VHT SIG field is identical to the part of the BSSID of the BSS with which the STA is associated and a group ID (GID) included in the VHT SIG field is 0, the STA operates in the doze state until the end of the PPDU.

4 . The method according to claim 3 , wherein when the GID included in the VHT SIG field is 0 but the PAID included in the VHT SIG field is not identical to the part of the BSSID of the BSS with which the STA is associated, the STA maintains an awake state.

5 . The method according to claim 3 , wherein the part of the BSSID corresponds to B39 to B47 when a 0th bit of the BSSID of the BSS is expressed as B0, and the GID 0 is used when the VHT PPDU is the uplink frame.

6 . The method according to claim 3 , wherein the STA operates in the doze state for a remaining duration of the VHT PPDU after decoding the VHT SIG field including the GID and the PAID of the VHT PPDU.

7 . The method according to claim 1 , wherein the STA continues to operate a network allocation vector (NAV) timer for the doze state and is switched to an awake state at the end of the PPDU.

8 . A station (STA) operating in a power save (PS) mode in a wireless local area network (LAN) system that supports a high efficiency physical layer protocol data unit (HE PPDU), the STA comprising:
a receiver for receiving a PPDU; and a processor for decoding at least a part of the PPDU and controlling the STA to operate in a doze state until an end of the PPDU based on a result of decoding the at least a part of the PPDU, wherein when the PPDU is configured as a very high throughput (VHT) PPDU which is a legacy format compared to the HE PPDU, and the VHT PPDU is determined to be an uplink frame transmitted to an access point (AP) from another STA belonging to a basic service set (BSS) where the STA belongs, the processor operates the STA in the doze state until the end of the PPDU.

9 . The STA according to claim 8 , wherein the processor determines whether to operate in the doze state by considering whether a VHT SIG field of the VHT PPDU includes a part of a BSSID of the BSS with which the STA is associated.

10 . The STA according to claim 9 , wherein when a partial association ID (PAID) included in the VHT SIG field is identical to the part of the BSSID of the BSS with which the STA is associated and a group ID (GID) included in the VHT SIG field is 0, the processor operates in the doze state until the end of the PPDU.

11 . The STA according to claim 10 , wherein when the GID included in the VHT SIG field is 0 but the PAID included in the VHT SIG field is not identical to the part of the BSSID of the BSS with which the STA is associated, the processor maintains an awake state.

12 . The STA according to claim 10 , wherein the part of the BSSID corresponds to B39 to B47 when a 0th bit of the BSSID of the BSS is expressed as B0, and the GID 0 is used when the VHT PPDU is the uplink frame.

13 . The STA according to claim 10 , wherein the processor operates in the doze state for a remaining duration of the VHT PPDU after decoding the VHT SIG field including the GID and the PAID of the VHT PPDU.

14 . The STA according to claim 8 , wherein the processor continues to operate a network allocation vector (NAV) timer while the STA is operating in the doze state, and is switched to an awake state at the end of the PPDU.

Assignees

• Lg Electronics Inc

Inventors

• Kim Jeongki
• Ryu Kiseon
• Cho Hangyu

Classifications

• G06F1/3209

  Monitoring remote activity, e.g. over telephone lines or network connections · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04W52/0206 Primary

  in access points, e.g. base stations · CPC title

• G06F1/3287

  by switching off individual functional units in the computer system · CPC title

• H04W52/0216

  using a pre-established activity schedule, e.g. traffic indication frame · CPC title