DETERMINING NON-PRIMARY CHANNEL THAT IS AVAILABLE FOR NON-PRIMARY CHANNEL ACCESS (NPCA)
Disclosed herein is a method performed by a wireless device to perform non-primary channel access (NPCA). The method includes overhearing a control frame and a corresponding response frame transmitted in a primary channel in an overlapping basic service set (OBSS), extracting bandwidth information from a field of the control frame, determining an available non-primary channel based on a bandwidth indicated by the bandwidth information, and performing NPCA in the determined available non-primary channel in the BSS after overhearing the response frame.
1 . A method performed by a wireless device belonging to a basic service set (BSS) to perform non-primary channel access (NPCA), the method comprising:
overhearing a control frame and a corresponding response frame transmitted in a primary channel in an overlapping basic service set (OBSS);
extracting bandwidth information from a field of the control frame;
determining an available non-primary channel based on a bandwidth indicated by the bandwidth information; and
performing NPCA in the determined available non-primary channel in the BSS after overhearing the response frame.
2 . The method of claim 1 , wherein the control frame is a multi-user request-to-send (MU-RTS) frame and the response frame is a clear-to-send (CTS) frame.
3 . The method of claim 2 , wherein the field of the control frame from which the bandwidth information is extracted is an uplink bandwidth field that is used for indicating a bandwidth of the control frame.
4 . The method of claim 1 , wherein the available non-primary channel is determined to be a channel that excludes the bandwidth indicated by the bandwidth information.
5 . The method of claim 4 , wherein when the wireless device has a 160 Megahertz (MHz) operating bandwidth and the bandwidth indicated by the bandwidth information is 80 MHZ, the available non-primary channel is determined to be a secondary 80 MHz channel.
6 . The method of claim 1 , wherein the NPCA is performed during a transmission opportunity (TXOP) in the OBSS, wherein the TXOP was established in the OBSS based on an exchange of the control frame and the response frame in the OBSS.
7 . The method of claim 6 , further comprising:
ending the NPCA when the TXOP ends.
8 . The method of claim 1 , wherein the wireless device operates as an access point (AP) or a non-AP station (STA) in the BSS.
9 . A wireless device configured to perform non-primary channel access (NPCA) in a basic service set (BSS), the wireless device comprising:
a radio frequency transceiver;
a memory device storing a set of instructions; and
a processor coupled to the memory device, wherein the set of instructions, when executed by the processor, causes the wireless device to:
overhear a control frame and a corresponding response frame transmitted in a primary channel in an overlapping basic service set (OBSS);
extract bandwidth information from a field of the control frame;
determine an available non-primary channel based on a bandwidth indicated by the bandwidth information; and
perform NPCA in the determined available non-primary channel in the BSS after overhearing the response frame.
10 . The wireless device of claim 9 , wherein the control frame is a multi-user request-to-send (MU-RTS) frame and the response frame is a clear-to-send (CTS) frame.
11 . The wireless device of claim 10 , wherein the field of the control frame from which the bandwidth information is extracted is an uplink bandwidth field that is used for indicating a bandwidth of the control frame.
12 . The wireless device of claim 9 , wherein the available non-primary channel is determined to be a channel that excludes the bandwidth indicated by the bandwidth information.
13 . The wireless device of claim 12 , wherein when the wireless device has a 160 Megahertz (MHz) operating bandwidth and the bandwidth indicated by the bandwidth information is 80 MHz, the available non-primary channel is determined to be a secondary 80 MHz channel.
14 . The wireless device of claim 9 , wherein the NPCA is performed during a transmission opportunity (TXOP) in the OBSS, wherein the TXOP was established in the OBSS based on an exchange of the control frame and the response frame in the OBSS.
15 . The wireless device of claim 14 , wherein the set of instructions, when executed by the processor, further causes the wireless device to:
ending the NPCA when the TXOP ends.
16 . The wireless device of claim 9 , wherein the wireless device is configured to operate as an access point (AP) or a non-AP station (STA) in the BSS.