CPC H04W 74/0816 (2013.01) [H04L 1/1896 (2013.01); H04W 74/008 (2013.01)] | 18 Claims |
1. A backoff method in a transmission process, comprising:
performing, by a sending device, listen before talk (LBT) on an unlicensed frequency band; and
sending, by the sending device, a request to send (RTS) frame to a receiving device at a time the LBT is successfully performed, wherein the RTS frame comprises a first backoff time period having a starting time no later than a time the RTS frame is listened by another device and an ending time which is configured as an expected sending time of a confirmation on clear to send (C-CTS) frame, wherein the C-CTS frame is an acknowledgement frame sent by the sending device after receiving a clear to send (CTS) frame sent by the receiving device;
receiving, by the sending device, the CTS frame sent by the receiving device; and
sending, by the sending device, the C-CTS frame to the receiving device, wherein the C-CTS frame includes a second backoff time period having a starting time no later than a time the C-CTS frame is listened by another device and an ending time which is a time a current data transmission is finished.
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