1. A base wireless communication terminal, the terminal comprising:a transceiver; and
wherein the processor is configured to:
transmit, through the transceiver, a trigger frame triggering a multi-user uplink transmission of one or more terminals, and
receive, through the transceiver, uplink packet(s) transmitted from one or more terminals in response to the trigger frame,
wherein a predetermined padding is performed before a frame check sequence (FCS) field of the trigger frame, and
wherein a predetermined association ID (AID) field information is inserted to the trigger frame to indicate the predetermined padding.