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Channel access method and apparatus

  • US 10,536,988 B2
  • Filed: 11/27/2017
  • Issued: 01/14/2020
  • Est. Priority Date: 05/27/2015
  • Status: Active Grant
First Claim
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1. A channel access method, applied to a wireless local area network, and comprising:

  • generating, by a station, a backoff counter value, wherein the backoff counter value is randomly selected from a range from zero to CWo, CWo is a contention window for orthogonal frequency division multiple access (OFDMA) subchannel contention, and CWo is an integer greater than 0;

    receiving, by the station, a first trigger frame, wherein the first trigger frame is sent by an access point, 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 or equal to 0;

    performing, by the station, backoff operation, wherein the backoff operation comprises;

    deducting, from the backoff counter value, the quantity of subchannels for random access, to obtain a new backoff counter value;

    when the new backoff counter value is 0 or a negative number,performing, by the station, channel access, by randomly selecting one subchannel from the subchannels for random access to send an uplink frame;

    or when the new backoff counter value is greater than 0, receiving, by the station a second trigger frame sent by the access point, wherein the second trigger frame indicates a quantity of subchannels for random access, and the quantity of subchannels for random access is an integer greater than or equal to 0.

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