A wireless communication method, comprising:
- transmitting, by a wireless communication device, a first frame including at least one pair of a first field and a second field corresponding to the first field,
- wherein one of a first group identifier or a second group identifier is selectively set in the first field of the at least one pair, the first group identifier indicating first wireless communication terminals which have been associated with the wireless communication device, the second group identifier indicating second wireless communication terminals which have not been associated with the wireless communication device, and
- wherein first information to designate a resource unit for random access is set in the second field corresponding to the first field in which the first group identifier or the second group identifier is set,
- wherein the first frame triggers that
- each first wireless communication terminal of the first wireless communication terminals
- if the each first wireless communication terminal has data for uplink transmission, determines a first counted value by counting a number of first fields in which the first group identifier is set, determines a first subtracted value by subtracting the determined first counted value from a randomly selected first counter, and determines whether the each first wireless communication terminal has a right to select a resource unit based on the first subtracted value,
- in response to determining that the each first wireless communication terminal has the right to select a resource unit, randomly selects a first resource unit from the resource unit specified in the second field corresponding to the first field of the at least one pair in which the first group identifier is set, and
- transmits a second frame via the randomly selected the resource unit in a fixed time after the first frame is received, and
- each second wireless communication terminal of the second wireless communication terminals
- if the each second wireless communication terminal has data for uplink transmission, determines a second counted value by counting a number of first fields in which the second group identifier is set, determines a second subtracted value by subtracting the determined second counted value from a randomly selected second counter, and determines whether the each second wireless communication terminal has a right to select a resource unit based on the second subtracted value,
- in response to determining that the each second wireless communication terminal has the right to select a resource unit, randomly selects a second resource unit from the resource unit specified in the second field corresponding to the first field of the at least one pair in which the second group identifier is set, and
- transmits a third frame via the randomly selected second resource unit in a fixed time after the first frame is received;
- and
- receiving, by the wireless communication device, at least one second frame or at least one third frame, transmitted in response to the first frame.