Wireless communication terminal for multi-user uplink transmission, and wireless communication method

A wireless communication terminal, the terminal comprising:

• a transceiver;
• and
• a processor,
• wherein the processor is configured to:
• receive, through the transceiver, a trigger frame transmitted by a base wireless communication terminal, and
• perform a multi-user uplink transmission based on the received trigger frame, wherein the trigger frame includes a predetermined field indicating whether an additional trigger frame is present;
• and
• wherein when the trigger frame triggers a random access based multi-user uplink transmission and the terminal participates in the random access based multi-user uplink transmission in response to the trigger frame, the processor is further configured to:
• decrement a backoff counter for the random access based multi-user uplink transmission by a maximum of N in response to the trigger frame, wherein the N is the number of resource unit(s) allocated for the random access based multi-user uplink transmission and the resource unit(s) are allocated by the trigger frame, and
• perform the random access based multi-user uplink transmission when the backoff counter is decremented to 0.