Channel access method and apparatus

A chip, comprising:

• a processor and a non-transitory storage medium storing instructions, the instructions, when executed by the processor, cause the chip to:
• generate a backoff counter value, wherein the backoff counter value is randomly selected from a range from zero to CWo, wherein CWo is a contention window for orthogonal frequency division multiple access (OFDMA) subchannel contention, and CWo is an integer greater than 0;
• receive, a first trigger frame, wherein the first trigger frame indicates a quantity of subchannels for random access, and the quantity of subchannels for random access is an integer greater than 0;
• determine whether the backoff counter value is greater than the quantity of subchannels for random access;
• randomly select, one subchannel from the subchannels for random access to send an uplink frame when the backoff counter value is not greater than the quantity of subchannels for random access;
• and
• when it is determined that the backoff counter value is greater than the quantity of subchannels for random access, decrease the backoff counter value by the quantity of subchannels for random access to obtain a new backoff counter value.