Wireless communication method for multi-user transmission scheduling, and wireless communication terminal using same

A base wireless communication terminal comprising:

• a transceiver configured to transmit and receive wireless signals;
• and
• a processor configured to process wireless signals transmitted or received through the transceiver,
• wherein the processor is configured to:
• perform a backoff procedure for transmission of a trigger frame,
• wherein the backoff procedure is performed within a contention window for the transmission of the trigger frame,
• transmit the trigger frame, to at least one of terminal, based on the backoff procedure, and
• retransmit the trigger frame according to whether the transmission of the trigger frame is failed,
• wherein whether the transmission of the trigger frame is failed is determined based on whether at least one physical layer protocol data unit (PPDU) is received in response to the trigger frame from the at least one of terminal, and
• wherein a size of the contention window is adjusted to retransmit the trigger frame, when the transmission of the trigger frame is failed.