Method and apparatus for enhanced preamble punctured PPDU in a wireless network
Embodiments of the present invention provide a punctured preamble enabling wireless devices to efficiently use a channel (e.g., an 80 or 160 MHz channel) where a primary service is operating. A Wideband Channel Access Mechanism for 20 MHz/80 MHz operating STAs is provided so that a 20 MHz/80 MHz operating STA can dynamically move to a secondary channel to improve wireless performance of the STA. An AP coordinates the operating channel switch of the 20 MHz/80 MHz operating STA. An EHT cooperative multi-band operation can be applied to the preamble punctured PPDU for simultaneous multi-band operation.
1. A method of wireless communication using a preamble punctured Physical Layer Convergence Protocol (PLCP) Protocol Data Unit (PPDU), the method comprising:
puncturing a 20 MHz channel of an 80 MHz channel, wherein the punctured 20 MHz channel is operable to service a wireless device;
encoding an indication of the punctured 20 MHz channel in a fixed-length SIG field; and
transmitting the fixed-length SIG field in a preamble punctured PPDU on a primary 20 MHz channel of the 80 MHz channel.
2. The method as recited in claim 1 , wherein the 80 MHz channel comprises the primary 20 MHz channel, a 20 MHz secondary channel, and a 40 MHz secondary channel, and wherein the puncturing comprises puncturing the 20 MHz secondary channel.
3. The method as recited in claim 2 , wherein a bandwidth field of the preamble punctured PPDU comprises a value of 4.
4. The method as recited in claim 1 , wherein the 80 MHz channel comprises the primary 20 MHz channel, a 20 MHz secondary channel, 40 MHz left secondary channel, and a 40 MHz right secondary channel, and wherein the puncturing comprises puncturing the 40 MHz left secondary channel.
5. The method as recited in claim 4 , wherein a bandwidth field of the preamble punctured PPDU comprises a value of 5.
6. The method as recited in claim 1 , further comprising performing an MU-RTS Trigger/CTS frame exchange.
7. The method as recited in claim 6 , wherein performing an MU-RTS Trigger/CTS frame exchange comprises soliciting simultaneous CTS frame responses from a plurality of wireless STAs.
8. The method as recited in claim 7 , wherein an MU-RTS Trigger frame of the MU-RTS Trigger/CTS frame exchange comprises a Disallowed Subchannel Bitmap in a User Info field indicating disallowed 20 MHz subchannels and disallowed 242-tone RUs.
9. The method as recited in claim 8 , wherein an AID12 subfield of the MU-RTS Trigger frame is set to a value of 2047.
10. The method as recited in claim 1 , wherein the primary 20 MHz channel is operable to service a basic service set (BSS), and wherein the punctured 20 MHz channel is further operable to service an overlapping BSS (OBSS).
11. A method of wireless communication using a preamble punctured Physical Layer Convergence Protocol (PLCP) Protocol Data Unit (PPDU), the method comprising:
puncturing a 20 MHz channel of a 160 MHz channel, wherein the punctured 20 MHz channel is operable to service a wireless device;
encoding an indication of the punctured 20 MHz channel in a fixed-length SIG field; and
transmitting the fixed-length SIG field in a preamble punctured PPDU on both a primary channel and a secondary channel of the 160 MHz channel.
12. The method as recited in claim 11 , wherein the 160 MHz channel comprises an 80+80 MHz channel.
13. The method as recited in claim 11 , wherein a bandwidth field of the preamble punctured PPDU comprises a value of 6 indicating that a secondary 20 MHz channel of a primary 80 MHz channel is punctured.
14. The method as recited in claim 11 , wherein a bandwidth field of the preamble punctured PPDU comprises a value of 7 indicating that a primary 40 MHz channel of a primary 80 MHz channel is punctured.
15. The method as recited in claim 11 , wherein one, two, or three 20 MHz channels of a secondary 80 MHz channel are punctured.
16. The method as recited in claim 11 , wherein the primary channel and the secondary channel are operable to service a basic service set (BSS), and wherein the punctured 20 MHz channel is further operable to service an overlapping BSS (OBSS).