CPC H04W 74/0816 (2013.01) [H04W 74/08 (2013.01); H04W 74/0833 (2013.01); H04W 84/12 (2013.01); H04W 74/0808 (2013.01)] | 20 Claims |
1. A wireless communication terminal, the terminal comprising:
a processor; and
a communication unit,
wherein the processor is configured to:
obtain contention window information for a contention window for selecting an OBO (orthogonal frequency division multiple access (OFDMA) random access backoff) counter,
wherein the OBO counter is selected within the contention window,
receive a trigger frame including a resource allocation field and a CS(Carrier Sensing) required field indicating whether a carrier sensing is required,
perform carrier sensing according to a value of the CS required field,
wherein a new OBO counter is randomly selected within the contenting window, when a channel for transmitting an uplink frame is busy based on the CS,
transmit the uplink frame according to a state of the channel based on the CS when the OBO counter or the new OBO counter is ‘0’ or decreased to ‘0’, and
wherein the OBO counter or the new OBO counter is not decremented when there is no pending data to be transmitted by the terminal.
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