Synchronized channel access coexistence
This disclosure provides methods, devices and systems for synchronized channel access. Some implementations more specifically relate to facilitating coexistence among wireless communication devices that support synchronized channel access and those that do not. A group of access points may schedule periodically recurring, synchronized channel access periods by periodically transmitting quiet elements. The quiet elements establish recurring quiet periods during which legacy devices are not permitted to transmit. In some implementations, an access point may transmit one or more quiet override elements each associated with a respective quiet element and indicating to other access points supporting synchronized channel access that they are permitted to contend for access during the respective quiet period. In some other implementations of synchronized channel access, an access point supporting synchronized channel access that wins contention after one or more consecutive synchronized channel access periods during which no other synchronized access points won contention, may be entitled to an extended TXOP.
1. A method for wireless communication by a wireless communication device of a first wireless access point (AP), comprising:
transmitting or receiving a management frame that includes:
one or more quiet elements, each quiet element indicating to wireless communication devices of a first type that they are not permitted to transmit on a wireless channel during a quiet period defined by the respective quiet element, and
a quiet override element indicating to a group of wireless communication devices, that the group of wireless communication devices are permitted to contend for access to the wireless channel during at least one quiet period of the quiet periods defined by the one or more quiet elements; and
contending for access to the wireless channel during the at least one quiet period for which the quiet override element indicates that the group of wireless communication devices are permitted to contend for access to the wireless channel.
2. The method of claim 1 , wherein each of the quiet periods during which the group of wireless communication devices are permitted to contend for access to the wireless channel includes a contention period, and wherein wireless APs of the group of wireless communication devices are not permitted to contend for access to the wireless channel for a remainder of each of the quiet periods after the respective contention periods.
3. The method of claim 2 , wherein the quiet override element includes a field indicating a duration of each of the contention periods.
4. The method of claim 1 , wherein each quiet element includes a field indicating a periodicity of the respective quiet period, a field indicating a duration of the respective quiet period, and a field indicating a start of the respective quiet period.
5. The method of claim 1 , wherein the quiet override element includes a bitmap including a plurality of bits, each bit of the plurality of bits being associated with a respective one of the quiet elements and indicating whether a group of wireless communication devices is permitted to contend for access to a wireless channel during the quiet period defined by the respective quiet element.
6. The method of claim 1 , wherein the quiet override element is not interpretable by the wireless communication devices of the first type.
7. The method claim 1 , further comprising:
transmitting an operation element indicating that the first wireless AP supports the use of quiet override elements; or
receiving a capability element from a wireless AP of the group of wireless communication devices indicating that the respective wireless communication device supports the use of quiet override elements.
8. The method of claim 1 , wherein the first wireless AP is associated with a first basic service set (BSS) color, the method further comprising:
detecting a wireless transmission from a second wireless AP of the group of wireless communication devices during a one of the quiet periods during which the group of wireless communication devices are permitted to contend for access to the wireless channel;
identifying a second BSS color associated with the second wireless AP; and
transmitting one or more wireless packets on the wireless channel during the one of the quiet periods based on determining that the second BSS color is different than the first BSS color.
9. The method of claim 1 , further comprising transmitting target wake time (TWT) information to one or more stations indicating a schedule of one or more wake periods during which the one or more stations are to wake to transmit or receive wireless packets, the one or more wake periods being within respective ones of the quiet periods.
10. The method of claim 1 , wherein the quiet override element further indicates, to a group of wireless STAs, that STAs of the group of wireless STAs can expect to receive downlink data from the first wireless AP during the at least one quiet period.
11. The method of claim 1 , wherein the quiet override element further indicates, to a group of wireless STAs, that STAs of the group of wireless STAs can expect to transmit an uplink communication during the at least one quiet period in response to receiving a trigger frame from the first wireless AP during the at least one quiet period.
12. A wireless communication device of a first wireless access point (AP) comprising:
at least one modem;
at least one processor communicatively coupled with the at least one modem; and
at least one memory communicatively coupled with the at least one processor and storing processor-readable code that, when executed by the at least one processor in conjunction with the at least one modem, is configured to cause the wireless communication device to:
transmit or receive a management frame that includes:
one or more quiet elements, each quiet element indicating to wireless communication devices of a first type that they are not permitted to transmit on a wireless channel during a quiet period defined by the respective quiet element, and
a quiet override element indicating to a group of wireless communication devices, that the group of wireless communication devices are permitted to contend for access to the wireless channel during at least one quiet period of the quiet periods defined by the one or more quiet elements; and
contend for access to the wireless channel during the at least one quiet period for which the quiet override element indicates that the group of wireless communication devices are permitted to contend for access to the wireless channel.
13. The wireless communication device of claim 12 , wherein each of the quiet periods during which the group of wireless communication devices are permitted to contend for access to the wireless channel includes a contention period, and wherein wireless APs of the group of wireless communication devices are not permitted to contend for access to the wireless channel for a remainder of each of the quiet periods after the respective contention periods.
14. The wireless communication device of claim 13 , wherein the quiet override element includes a field indicating a duration of each of the contention periods.
15. The wireless communication device of claim 12 , wherein each quiet element includes a field indicating a periodicity of the respective quiet period, a field indicating a duration of the respective quiet period, and a field indicating a start of the respective quiet period.
16. The wireless communication device of claim 12 , wherein the quiet override element includes a bitmap including a plurality of bits, each bit of the plurality of bits being associated with a respective one of the quiet elements and indicating whether a group of wireless communication devices is permitted to contend for access to a wireless channel during the quiet period defined by the respective quiet element.
17. The wireless communication device of claim 12 , wherein the quiet override element is not interpretable by the wireless communication devices of the first type.
18. The wireless communication device of claim 12 , wherein the code, when executed by the at least one processor in conjunction with the at least one modem, is further configured to cause the wireless communication device to:
transmit an operation element indicating that the first wireless AP supports the use of quiet override elements; or
receive a capability element from a wireless communication device indicating that the respective communication device supports the use of quiet override elements.
19. The wireless communication device of claim 12 , wherein the first AP is associated with a first basic service set (BSS) color, and wherein the code, when executed by the at least one processor in conjunction with the at least one modem, is further configured to cause the wireless communication device to:
detect a wireless transmission from a second wireless AP of the group of wireless communication devices during a one of the quiet periods during which the group of wireless communication devices are permitted to contend for access to the wireless channel;
identify a second BSS color associated with the second wireless AP; and
transmit one or more wireless packets on the wireless channel during the one of the quiet periods based on determining that the second BSS color is different than the first BSS color.
20. The wireless communication device of claim 12 , wherein the code, when executed by the at least one processor in conjunction with the at least one modem, is further configured to cause the wireless communication device to transmit target wake time (TWT) information to one or more stations indicating a schedule of one or more wake periods during which the one or more stations are to wake to transmit or receive wireless packets, the one or more wake periods being within respective ones of the quiet periods.
21. The wireless communication device of claim 12 , wherein the quiet override element further indicates, to a group of wireless STAs, that STAs of the group of wireless STAs can expect to receive downlink data from the first wireless AP during the at least one quiet period.
22. The wireless communication device of claim 12 , wherein the quiet override element further indicates, to a group of wireless STAs, that STAs of the group of wireless STAs can expect to transmit an uplink communication during the at least one quiet period in response to receiving a trigger frame from the first wireless AP during the at least one quiet period.