US 12,004,105 B2
Time synchronization method and apparatus
Yi Wang, Shanghai (CN); Zhenyu Shi, Shanghai (CN); and Yingjie Yu, Shanghai (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed on Mar. 26, 2021, as Appl. No. 17/213,827.
Application 17/213,827 is a continuation of application No. PCT/CN2019/106111, filed on Sep. 17, 2019.
Claims priority of application No. 201811137936.3 (CN), filed on Sep. 28, 2018.
Prior Publication US 2021/0219254 A1, Jul. 15, 2021
Int. Cl. H04J 3/06 (2006.01); H04L 5/00 (2006.01); H04W 56/00 (2009.01)
CPC H04W 56/0015 (2013.01) [H04J 3/0682 (2013.01); H04L 5/0048 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A time synchronization method in a wireless communications system, wherein the wireless communications system comprises a first node and a second node, and the method comprises:
sending, by the first node, a first reference signal to the second node, and receiving an arrival time t2 at which the first reference signal arrives at the second node and that is sent by the second node;
receiving, by the first node, a second reference signal and a sending time t3 at which the second reference signal is sent that are sent by the second node; and
calculating, by the first node, a time of arrival (TOA) and a timing error Toffset based on the arrival time t2 of the first reference signal, the sending time t3 of the second reference signal, a sending time t1 at which the first node sends the first reference signal, and an arrival time t4 of the second reference signal received by the first node, wherein
the time of arrival (TOA) comprises a difference between a time at which the second node sends a first signal and a time at which the first node receives the first signal sent by the second node, or a difference between a time at which the first node sends a second signal and a time at which the second node receives the second signal sent by the first node, the timing error Toffset comprises a frame error between the first node and the second node or a slot synchronization error between the first node and the second node, the first signal comprises the first reference signal, and the second signal comprises the second reference signal.