Low latency schemes for peer-to-peer (P2P) communications
This disclosure provides systems and methods for requesting wireless resources for peer-to-peer (P2P) communications. In some implementations, a wireless communication device transmits a frame over a wireless medium to an access point (AP), the frame including a medium access control (MAC) header carrying a request for the AP to allocate part of a transmission opportunity (TXOP) for P2P communications between the wireless communication device and a client device. The wireless communication device receives a trigger frame allocating a portion of the TXOP for the P2P communications, and transmits or receives P2P data to or from the client device over the wireless medium during the allocated portion of the TXOP. In some instances, the MAC header of the frame includes a Quality-of-Service (QoS) Control field carrying the request. In some other instances, the MAC header of the frame includes an Aggregated-Control (A-Control) subfield carrying the request.
1 . A method for wireless communication by a wireless communication device, comprising:
transmitting a frame over a wireless medium to an access point (AP), the frame including a medium access control (MAC) header carrying a request for the AP to allocate part of a transmission opportunity (TXOP) for peer-to-peer (P2P) communications between the wireless communication device and a client device, wherein the MAC header of the frame includes an aggregated-control (A-Control) subfield carrying the request, the A-Control subfield carrying a traffic identifier (TID) of the P2P communications, and the A-Control subfield carrying a delta TID subfield indicating that the frame is a P2P request frame;
receiving a trigger frame over the wireless medium from the AP, the trigger frame allocating a portion of the TXOP to the wireless communication device for the P2P communications; and
transmitting or receiving P2P data to or from the client device over the wireless medium during the allocated portion of the TXOP.
2 . The method of claim 1 , wherein the request indicates one or more of a duration of the requested part of the TXOP, a requested bandwidth for the P2P communications, a Stream Classification Service (SCS) identifier (SCSID) of the P2P communications, a requested start time of a service period associated with the P2P communications, a requested service interval for the P2P communications, a delay bound for the service period associated with the P2P communications, or a requested type of trigger frame.
3 . The method of claim 1 , wherein the MAC header of the frame includes a Quality-of-Service (QoS) control field carrying the request.
4 . The method of claim 3 , wherein the QoS control field includes:
a reserved bit set to a value indicating that the frame is the P2P request frame;
a Traffic Identifier (TID) subfield set to a value indicating that the frame is the P2P request frame, the value being greater than or equal to 8; or
an Acknowledgement (ACK) Policy Indicator subfield set to a value indicating that the frame is the P2P request frame.
5 . The method of claim 3 , wherein the QoS control field includes an End Of Service Period (EOSP) subfield, an Acknowledgement (ACK) Policy Indicator subfield following the EOSP subfield, a reserved bit following the ACK Policy Indicator subfield, and an octet following the reserved bit, wherein the octet indicates one or more of a duration of the requested part of the TXOP, a queue size of the wireless communication device, or a TXOP sharing mode bandwidth based on values carried in the EOSP subfield and the reserved bit.
6 . The method of claim 5 , wherein:
the EOSP subfield carrying a value of 0 when the reserved bit is set to 1 signals that the octet indicates the duration of the requested part of the TXOP and signals that the ACK Policy Indicator subfield indicates the TXOP sharing mode bandwidth; and
the EOSP subfield carrying a value of 1 when the reserved bit is set to 1 signals that the octet indicates both the TXOP sharing mode bandwidth and the duration of the requested part of the TXOP.
7 . The method of claim 6 , wherein the EOSP subfield set to a value of 0 when the reserved bit is set to 0 signals that the octet indicates the duration of the requested part of the TXOP, and wherein the EOSP subfield set to 1 when the reserved bit is set to 0 signals that the octet indicates the queue size of the wireless communication device.
8 . The method of claim 1 , wherein the A-Control subfield includes:
a Control Identification (ID) subfield carrying a reserved value indicating that the frame is the P2P request frame; and
a Control Information subfield carrying one or more parameters for the P2P communications associated with the request for the allocated portion of the TXOP.
9 . The method of claim 8 , wherein the reserved value carried in the Control ID subfield is one of 9, 11, 12, 13, or 14.
10 . The method of claim 8 , wherein the one or more parameters for the P2P communications include one or more of a duration of the requested part of the TXOP, a requested bandwidth for the P2P communications, a requested start time of a service period associated with the P2P communications, a requested service interval for the P2P communications, a requested type of trigger frame for soliciting the P2P communications, a Stream Classification Service (SCS) identifier (SCSID) of the P2P communications, a user priority of a traffic flow associated with the P2P communications, a queue size of the wireless communication device, or a delay bound for the service period associated with the P2P communications.
11 . The method of claim 1 , wherein the A-Control subfield carries a Control Information subfield including:
the delta TID subfield carrying a reserved value indicating that the frame is the P2P request frame; and
a Queue Size High subfield and a Queue Size All subfield carrying values that collectively indicate a duration of the requested part of the TXOP and a requested TXOP sharing mode bandwidth.
12 . The method of claim 1 , wherein the frame is a target wake time (TWT) request frame that includes a TWT Element indicating a MAC address of the client device and one or more TWT parameters of a restricted TWT (r-TWT) service period (SP) associated with the P2P communications.
13 . The method of claim 1 , wherein the frame is a Stream Classification Service (SCS) request frame that includes a Traffic Specification (TSPEC) Element indicating a MAC address of the client device and one or more data rate parameters of a restricted Target Wake Time (r-TWT) service period (SP) associated with the P2P communications.
14 . The method of claim 1 , wherein the trigger frame identifies the wireless communication device and the client device.
15 . The method of claim 1 , wherein the trigger frame comprises a multi-user (MU) Request-to-Send (RTS) TXOP Sharing (TXS) trigger frame that includes a TXOP sharing mode subfield indicating a TXOP sharing mode for the P2P communications between the wireless communication device and the client device.
16 . The method of claim 1 , further comprising:
receiving, from the AP over the wireless medium, a response frame that includes a MAC header carrying an acknowledgement of the request.
17 . The method of claim 16 , wherein the MAC header of the response frame includes a QoS control field or an A-Control subfield indicating one or more of a duration of the requested part of the TXOP, a bandwidth to be allocated for the P2P communications, a TID of the P2P communications, a Stream Classification Service (SCS) identifier (SCSID) of the P2P communications, a start time for a service period associated with the P2P communications, a service interval associated with the P2P communications, a delay bound for the service period associated with the P2P communications, or a requested type of trigger frame.
18 . A wireless communication device comprising:
one or more memories storing processor-executable code; and
one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the wireless communication device to:
transmit a frame over a wireless medium to an access point (AP), the frame including a medium access control (MAC) header carrying a request for the AP to allocate part of a transmission opportunity (TXOP) for peer-to-peer (P2P) communications between the wireless communication device and a client device, wherein the MAC header of the frame includes an aggregated-control (A-Control) subfield carrying the request, the A-Control subfield carrying a traffic identifier (TID) of the P2P communications, and the A-Control subfield carrying a delta TID subfield indicating that the frame is a P2P request frame;
receive a trigger frame over the wireless medium from the AP, the trigger frame allocating a portion of the TXOP to the wireless communication device for the P2P communications; and
transmit or receive P2P data to or from the client device over the wireless medium during the allocated portion of the TXOP.
19 . The wireless communication device of claim 18 , wherein the request indicates one or more of a duration of the requested part of the TXOP, a requested bandwidth for the P2P communications, a Stream Classification Service (SCS) identifier (SCSID) of the P2P communications, a requested start time of a service period associated with the P2P communications, a requested service interval for the P2P communications, a delay bound for the service period associated with the P2P communications, or a requested type of trigger frame.