Wireless communication method using enhanced distributed channel access, and wireless communication terminal using same

A wireless communication terminal that wirelessly communicates with a base wireless communication terminal, the wireless communication terminal comprising:

• a transceiver;
• and
• a processor,
• wherein the processor is configured to:
• transmit, to the base wireless communication terminal, a trigger-based physical layer protocol data unit (PPDU) using the transceiver,
• switch a parameter set, which is a set of parameters used for the channel access, from a first parameter set to a second parameter set based on whether the base wireless communication terminal triggers a multi-user uplink transmission participation of the wireless communication terminal,
• when a MAC protocol data unit (MPDU) included in the trigger-based PPDU does not request an immediate response, set a second parameter set timer for an access category of the MPDU when the transmission of the trigger-based PPDU ends,
• when the MPDU included in the trigger-based PPDU requests the immediate response, set the second parameter set timer for the access category of the MPDU for which immediate response is received,
• when the second parameter set timer expires, terminate an application of the second parameter set, and
• access a channel according to a priority of data to be transmitted to the base communication terminal by the wireless communication terminal and the parameter set.