Method and apparatus for uplink multi-user transmission in a high efficiency wireless LAN

A station for facilitating multi-user communication in a wireless network, the station comprising:

• one or more memories;
• and
• one or more processors coupled to the one or more memories, the one or more processors configured to:
• acquire a transmission opportunity (TXOP) for initiating a frame exchange sequence that includes a trigger frame, an uplink frame and a control response frame;
• determine whether the frame exchange sequence is valid;
• and
• transmit the trigger frame to one or more stations (STAs) in response to the frame exchange sequence is determined to be valid,
• wherein the frame exchange sequence is valid in response to transmission of the uplink frame and the control response frame do not exceed a TXOP limit,
• wherein the trigger frame includes an adjusted duration value of the transmission of the uplink frame to meet the TXOP limit in response to the transmission of the uplink frame and the control response frame exceed the TXOP limit,
• wherein common transmission parameters for a subsequent uplink frame are included in an HE-SIG-A subfield of a physical layer protocol data unit PPDU that includes the trigger frame whereas individual transmission parameters for the subsequent uplink frame are included in an HE-SIG-B frame of the PPDU, and
• wherein a user equipment (UE) does not derive any transmission parameters for the subsequent uplink frame in order to meet the TXOP limit.

A non-transitory computer-readable storage medium storing computer executable instructions that, when executed by one or more processors, cause one or more processors to perform:

• acquiring a transmission opportunity (TXOP) for initiating a frame exchange sequence that includes a trigger frame, an uplink frame and a control response frame;
• determining whether the frame exchange sequence is valid;
• and
• transmitting the trigger frame to one or more stations (STAs) in response to the frame exchange sequence is determined to be valid,
• wherein the frame exchange sequence is valid in response to transmission of the uplink frame and the control response frame do not exceed a TXOP limit, and
• wherein the trigger frame includes an adjusted duration value of the transmission of the uplink frame to meet the TXOP limit in response to the transmission of the uplink frame and the control response frame exceed the TXOP limit,
• wherein common transmission parameters for a subsequent uplink frame are included in an HE-SIG-A subfield of a physical layer protocol data unit PPDU that includes the trigger frame whereas individual transmission parameters for the subsequent uplink frame are included in an HE-SIG-B frame of the PPDU, and
• wherein a user equipment (UE) does not derive any transmission parameters for the subsequent uplink frame in order to meet the TXOP limit.