Wireless communication method using ofdma random 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:
• when the wireless communication terminal is associated to a BSS corresponding to a nontransmitted Basic Service Set Identification (BSSID) of a multiple BSSID set, set an OFDMA Contention Window (OCW) minimum value, which is a parameter indicating the minimum value of an OCW, and an OCW maximum value, which is a parameter indicating the maximum value of the OCW, according to UL OFDMA-based Random Access (UORA) parameter set element from a BSS corresponding to a transmitted BSSID of the multiple BSSID set, wherein the UORA parameter set includes a parameter related to the counter,
• set an integer selected from a range of 0 to a value equal to or smaller than the OCW as a counter for random access,
• receive a trigger frame for triggering random access using one or more resource units (RUs) allocated for the random access from the base wireless communication terminal using the transceiver,
• decrement a value of the counter based on the one or more RUs allocated for the random access and a capability of the wireless communication terminal, and
• attempt transmission to the base wireless communication terminal when the value of the counter is 0 or reaches 0,
• wherein the RU is a group of a plurality of subcarriers usable for uplink transmission and downlink transmission.

A method of operating a wireless communication terminal wirelessly communicating with a base wireless communication terminal, the method comprising:

• when the wireless communication terminal is associated to a BSS corresponding to a nontransmitted Basic Service Set Identification (BSSID) of a multiple BSSID set, setting an OFDMA Contention Window (OCW) minimum value, which is a parameter indicating the minimum value of an OCW, and an OCW maximum value, which is a parameter indicating the maximum value of the OCW, according to UL OFDMA-based Random Access (UORA) parameter set element from a BSS corresponding to a transmitted BSSID of the multiple BSSID set, wherein the UORA parameter set includes a parameter related to the counter;
• setting an integer selected from a range of 0 to a value equal to or smaller than the OCW as a counter for random access;
• receiving a trigger frame for triggering random access using one or more resource units (RUs) allocated for random access from the base wireless communication terminal;
• decrementing a value of the counter based on the one or more RUs allocated for the random access and a capability of the wireless communication terminal;
• and
• attempting transmission to the base wireless communication terminal when the value of the counter is 0 or reaches 0,
• wherein the RU is a group of a plurality of subcarriers useable for OFDM communication.