Methods and apparatus for multiple user uplink

A user terminal for wireless communication, comprising:

• a receiver configured to receive a trigger frame from an access point including one or more parameters indicating a modulation and coding scheme (MCS) and a level of aggregation;
• a processor configured to:
• determine a target transmission duration for transmission of a physical layer (PHY) service data unit (PSDU) to the access point based on the one or more parameters in the trigger frame indicating the MCS,
• generate an aggregated medium access control (MAC) packet data unit (A-MPDU) frame comprising at least one A-MPDU subframe, the A-MPDU frame having a first length,
• determine whether an additional A-MPDU subframe having a second length may be added to the A-MPDU frame based at least in part on the first length, the second length, and the target transmission duration,
• include one or more padding subframes in the A-MPDU frame based at least in part on a comparison between the first length and the target transmission duration, and
• generate the PSDU, the PSDU including the A-MPDU frame and the one or more padding subframes;
• and
• a transmitter configured to transmit the generated PSDU over the target transmission duration and in accordance with the indicated level of aggregation.

A user terminal for wireless communication, comprising:

• means for receiving a trigger frame from an access point including one or more parameters indicating a modulation and coding scheme (MCS) and a level of aggregation;
• means for determining a target transmission duration for transmission of a physical layer (PHY) service data unit (PSDU) to the access point based on the one or more parameters in the trigger frame indicating the MCS;
• means for generating an aggregated medium access control (MAC) packet data unit (A-MPDU) frame comprising at least one A-MPDU subframe, the A-MPDU frame having a first length;
• means for determining whether an additional A-MPDU subframe having a second length may be added to the A-MPDU frame based at least in part on the first length, the second length, and the target transmission duration;
• means for including one or more padding subframes in the A-MPDU frame based at least in part on a comparison between the first length and the target transmission duration;
• means for generating the PSDU, the PSDU including the A-MPDU frame and the one or more padding subframes;
• and
• means for transmitting the generated PSDU over the target transmission duration and in accordance with the indicated level of aggregation.

A non-transitory computer readable medium comprising instructions that, when executed, perform a method of communication, the method comprising:

• receiving, at a user terminal, a trigger frame from an access point including one or more parameters indicating a modulation and coding scheme (MCS) and a level of aggregation;
• determining a target transmission duration for transmission of a physical layer (PHY) service data unit (PSDU) to the access point based on the one or more parameters in the trigger frame indicating the MCS;
• generating an aggregated medium access control (MAC) packet data unit (A-MPDU) frame comprising at least one A-MPDU subframe, the A-MPDU frame having a first length;
• determining whether an additional A-MPDU subframe having a second length may be added to the A-MPDU frame based at least in part on the first length, the second length, and the target transmission duration;
• including one or more padding subframes in the A-MPDU frame based at least in part on a comparison between the first length and the target transmission duration;
• generating the PSDU, the PSDU including the A-MPDU frame and the one or more padding subframes;
• and
• transmitting the generated PSDU from the user terminal over the target transmission duration and in accordance with the indicated level of aggregation.