Enhanced channel contention schemes for high-efficiency wlan

Patent metadata

Field	Value
Publication number	US-2016374087-A1
Application number	US-201615181354-A
Country	US
Kind code	A1
Filing date	Jun 13, 2016
Priority date	Jun 16, 2015
Publication date	Dec 22, 2016
Grant date	—

Abstract

A unified channel contention scheme is proposed such that spatial reuse can be enabled by a wireless station (STA) when a basic service set (BSS) color of a received signal cannot be resolved. If the detected frame is an intra-BSS frame, then the STA should not contend the channel for the PPDU duration. If the detected frame is an inter-BSS frame, then the STA uses OBSS Packet Detection (OBSS-PD) level as the CCA level for channel contention. Furthermore, when BSS color cannot be resolved, channel contention schemes for WiFi signal and non-WiFi signal are differentiated. If the received signal is detected as WiFi signal, then the STA uses WiFi-SIG Detection (WD) level as the CCA level for channel contention. If the received signal is detected as non-WiFi signal, then the STA uses Non-WiFi-SIG Detection (NWD) level as the CCA level for channel contention.

First claim

What is claimed is:

1 . A method comprising:
receiving a radio signal over a wireless channel by a wireless station in a wireless local area network, wherein the radio signal carries a data packet; determining whether the data packet has an intra-basic service set (BSS) packet type or an inter-BSS packet type by resolving a BSS color of the data packet; detecting whether the radio signal has a WiFi radio signal type or a non-WiFi radio signal type if the BSS color cannot be resolved; and performing a channel contention scheme to gain access to the wireless channel, wherein the channel contention scheme applies a clear channel assessment (CCA) level that is determined based on the decoded packet type and the detected radio signal type.

2 . The method of claim 1 , wherein the wireless station does not contend for channel access if the data packet type is intra-BSS.

3 . The method of claim 1 , wherein the wireless station applies a first CCA level if the data packet type is inter-BSS.

4 . The method of claim 1 , wherein the wireless station applies a second CCA level if the radio signal is a WiFi signal but the BSS color cannot be resolved.

5 . The method of claim 1 , wherein the wireless station applies a third CCA level if the radio signal is a non-WiFi signal.

6 . The method of claim 1 , wherein the BSS color is indicative of a BSS identifier (ID), and wherein the BSS color is a subfield contained in a signal field of the data packet.

7 . The method of claim 1 , wherein the wireless station detects the radio signal type based on WiFi signal features.

8 . The method of claim 7 , wherein the wireless station performs auto-correlation of the radio signal with an OFDM modulated WiFi signal having a predefined OFDM symbol length and a predefined cyclic prefix (CP) length.

9 . The method of claim 1 , wherein the wireless station detects the radio signal type based on Long Term Evolution (LTE) signal features.

10 . The method of claim 9 , wherein the wireless station performs auto-correlation of the radio signal with a predefined primary synchronization signal (PSS).

11 . A wireless station, comprising:
a receiver that receives a radio signal over a wireless channel in a wireless local area network, wherein the radio signal carries a data packet; a decoder that decodes the data packet and determines whether the data packet has an intra-basic service set (BSS) packet type or an inter-BSS packet type by resolving a BSS color of the data packet; a radio signal detector that detects whether the radio signal has a WiFi radio signal type or a non-WiFi radio signal type if the BSS color cannot be resolved; and a channel access handler that performs a channel contention scheme to gain access to the wireless channel, wherein the channel contention scheme applies a clear channel assessment (CCA) level that is determined based on the decoded packet type and the detected radio signal type.

12 . The wireless station of claim 11 , wherein the wireless station does not contend for channel access if the data packet type is intra-BSS.

13 . The wireless station of claim 11 , wherein the wireless station applies a first CCA level if the data packet type is inter-BSS.

14 . The wireless station of claim 11 , wherein the wireless station applies a second CCA level if the radio signal is a WiFi signal but the BSS color cannot be resolved.

15 . The wireless station of claim 11 , wherein the wireless station applies a third CCA level if the radio signal is a non-WiFi signal.

16 . The wireless station of claim 11 , wherein the BSS color is indicative of a BSS identifier (ID), and wherein the BSS color is a subfield contained in a signal field of the data packet.

17 . The wireless station of claim 11 , wherein the wireless station detects the radio signal type based on WiFi signal features.

18 . The wireless station of claim 17 , wherein the wireless station performs auto-correlation of the radio signal with an OFDM modulated WiFi signal having a predefined OFDM symbol length and a predefined cyclic prefix (CP) length.

19 . The wireless station of claim 11 , wherein the wireless station detects the radio signal type based on Long Term Evolution (LTE) signal features.

20 . The wireless station of claim 19 , wherein the wireless station performs auto-correlation of the radio signal with a predefined primary synchronization signal (PSS).

Assignees

• Mediatek Inc

Inventors

• Liu Jianhan
• Huang Rongsheng
• Ma Li
• Wang Chao-Chun

Classifications

• H04L27/0006

  Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio (for spectrum sharing between different networks H04W16/14) · CPC title

• H04W74/0808 Primary

  using carrier sensing, e.g. carrier sense multiple access [CSMA] · CPC title

• H04J11/0073

  Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04L27/2605

  Symbol extensions, e.g. Zero Tail, Unique Word [UW] · CPC title