NAV setting method considering BSS color inactivation in wireless LAN system and apparatus therefor

Patent metadata

Field	Value
Publication number	US-10433345-B2
Application number	US-201715774259-A
Country	US
Kind code	B2
Filing date	Apr 26, 2017
Priority date	Apr 26, 2016
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

When an AP detects a collision between a neighbor BSS and a BSS color in a wireless LAN system, the AP can inform an STA of the same through information indicating whether the BSS color is disabled, and set and transmit a TXOP_duration field of a transmitted frame to a specific value differentiated from a normal duration value in order to prevent an erroneous NAV setting of the STA.

First claim

What is claimed is:

1. A method for an AP (access point) controlling a NAV (network allocation vector) setting of an STA (station) in a WLAN (wireless local area network) system, the method comprising:
detecting a BSS (basic service set) color overlap with an OBSS (overlapping basic service set);
transmitting, to the STA, a first frame containing BSS color disabled information set to a first value indicating disablement of a use of the BSS color; and
transmitting, to the STA, a second frame containing a TXOP_DURATION field set to a specific value other than normal duration values in response to the AP setting the BSS color disabled information to the first value.

2. The method of claim 1 , wherein, if the TXOP_DURATION field is set to the specific value, the STA does not update a NAV based on a value of the TXOP_DURATION field.

3. The method of claim 1 , wherein, although BSS color of the second frame is identical to BSS color of a BSS to which the STA belongs, the BSS color disabled information set to the first value makes the STA update an inter-BSS NAV.

4. The method of claim 3 , wherein, if a value of the TXOP_DURATION field is set to the specific value, the STA does not update the inter-BSS NAV.

5. The method of claim 1 , wherein, if a value of the TXOP_DURATION field is configured by the specific value, the STA operates based on an EIFS (extended inter-frame space).

6. The method of claim 1 , wherein the specific value of the TXOP_DURATION field corresponds to a value that all bits are set to 1.

7. A method of configuring a NAV (network allocation vector) of an STA (station) in a WLAN (wireless local area network) system, the method comprising:
receiving a first frame containing BSS (basic service set) color disabled information set to a first value indicating disablement of BSS color information, from an AP (access point); and
receiving, from the AP, a second frame containing a TXOP_DURATION field set to a specific value other than normal duration values in response to the AP setting the BSS color disabled information to the first value,
wherein, if a value of the TXOP_DURATION field is set to the specific value, the STA does not update a NAV based on the value of the TXOP_DURATION field.

8. The method of claim 7 , wherein the first frame containing the BSS color disabled information set to the first value is received when the AP detects a BSS (basic service set) color overlap with an OBSS (overlapping basic service set).

9. The method of claim 7 , wherein, if the BSS color disabled information set to the first value is received, the STA updates an inter-BSS NAV, although BSS color of the second frame is identical to BSS color of a BSS to which the STA belongs.

10. The method of claim 9 , wherein, if a value of the TXOP_DURATION field is configured by the specific value, the STA does not update the inter-BSS NAV.

11. The method of claim 7 , wherein, if a value of the TXOP_DURATION field is configured by the specific value, the STA operates based on an EIFS, extended inter-frame space.

12. The method of claim 7 , wherein the specific value of the TXOP_DURATION field corresponds to a value that all bits are set to 1.

13. An AP (access point) controlling a NAV (network allocation vector) setting of an STA (station) in a WLAN (wireless local area network) system, the AP comprising:
a processor configured to detect a BSS (basic service set) color overlap with an OBSS (overlapping basic service set); and
a transceiver configured to transmit to the STA under control of the processor,
a first frame containing BSS color disabled information set to a first value indicating disablement of BSS color information, in response to the processor detecting a BSS color overlap, and
a second frame containing a TXOP_DURATION field set to a specific value other than normal duration values in response to the processor setting the BSS color disabled information to the first value.

14. An STA (station) performing a NAV (network allocation vector) setting in a WLAN (wireless local area network) system, the STA comprising:
a transceiver configured to receive, from an AP (access point), a first frame containing BSS color disabled information set to a first value indicating disablement of BSS (basic service set) color information, and a second frame containing a TXOP_DURATION field set to a specific value other than normal duration values in response to the AP setting the BSS color disabled information to the first value; and
a processor configured not to update a NAV based on a value of the TXOP_DURATION field if the value of the TXOP_DURATION field is set to the specific value.

Assignees

• Lg Electronics Inc

Inventors

• Kim Jeongki
• Ryu Kiseon
• Cho Hangyu

Classifications

• H04W48/16

  Discovering, processing access restriction or access information · CPC title

• H04W74/006

  in the downlink, i.e. towards the terminal · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04W52/0212 Primary

  managed by the network, e.g. network or access point is leader and terminal is follower · CPC title

• H04W74/085 Primary

  collision avoidance · CPC title