Uplink multi-user multiple input multiple output for wireless local area network

A first communication device, comprising:

• a network interface device including:
• one or more integrated circuit (IC) devices, and
• a plurality of transceivers implemented at least partially on the one or more IC devices;
• wherein the one or more IC devices are configured to:
• transmit a polling communication frame that is configured to trigger a plurality of second communication devices to transmit respective feedback information that indicates respective amounts of data that the respective second communication devices have to transmit to the first communication device, wherein the polling communication frame includes a duration field that is set to indicate a transmit opportunity period (TXOP) of the first communication device, the TXOP including the polling communication frame and indicating a period during which an uplink multi-user transmission is to occur,
• receive the respective feedback information from the plurality of second communication devices during the TXOP,
• based on the respective feedback information, select a group of second communication devices that are to transmit simultaneously during the TXOP as part of the uplink multi-user transmission,
• transmit a trigger communication frame during the TXOP to trigger the group of second communication devices to transmit simultaneously as part of the uplink multi-user transmission, and
• receive the uplink multi-user transmission during the TXOP, wherein the uplink multi-user transmission is responsive to the trigger communication frame and includes respective simultaneous individual transmissions from respective second communication devices among the group of second communication devices.