US 11,871,449 B2
Backoff method and apparatus in transmission process, device, system, and storage medium
Yajun Zhu, Beijing (CN); Wei Hong, Beijing (CN); Tong Sha, Beijing (CN); and Yong Li, Beijing (CN)
Assigned to Beijing Xiaomi Mobile Software Co., Ltd., Beijing (CN); and Beijing University of Posts and Telecommunications, Beijing (CN)
Appl. No. 17/267,707
Filed by Beijing Xiaomi Mobile Software Co., Ltd., Beijing (CN); and BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS, Beijing (CN)
PCT Filed Aug. 15, 2018, PCT No. PCT/CN2018/100706
§ 371(c)(1), (2) Date Feb. 10, 2021,
PCT Pub. No. WO2020/034124, PCT Pub. Date Feb. 20, 2020.
Prior Publication US 2021/0321455 A1, Oct. 14, 2021
Int. Cl. H04W 74/08 (2009.01); H04L 1/1867 (2023.01); H04W 74/00 (2009.01)
CPC H04W 74/0816 (2013.01) [H04L 1/1896 (2013.01); H04W 74/008 (2013.01)] 18 Claims
OG exemplary drawing
 
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.