US Patent No. 10,117,205

METHOD AND DEVICE FOR PERFORMING SYNCHRONIZATION BETWEEN TERMINALS IN WIRELESS COMMUNICATION SYSTEM


Patent No. 10,117,205
Issue Date October 30, 2018
Title Method And Device For Performing Synchronization Between Terminals In Wireless Communication System
Inventorship Myoungseob Kim, Seoul (KR)
Hanbyul Seo, Seoul (KR)
Jihyun Lee, Seoul (KR)
Seungmin Lee, Seoul (KR)
Byounghoon Kim, Seoul (KR)
Assignee LG ELECTRONICS INC., Seoul (KR)

Claim of US Patent No. 10,117,205

1. A method for controlling generation of synchronization signals in a wireless communication system that supports Device to Device (D2D) communication, the method performed by a user equipment (UE) and comprising:transmitting a first synchronization signal for the D2D communication to neighboring UEs;
receiving a second synchronization signal from a source for the D2D communication;
comparing signal strength of the received second synchronization signal to a threshold value;
comparing a first counter value of the UE to a second counter value of the source when the signal strength is greater than the threshold value;
generating a third synchronization signal and transmitting the generated third synchronization signal to the neighboring UEs or transmitting the received second synchronization signal to the neighboring UEs according to the comparison of the first counter value to the second counter value; and
performing synchronization based on the received second synchronization signal when the UE transmits the received second synchronization signal to the neighboring UEs,
wherein the first counter and second counter are incremented every time a predetermined time elapses and a rate of increment decreases as a value of the first counter and second counter increases,
wherein the value of the first counter indicates an elapsed time since transmission of the first synchronization signal started, and
wherein the value of the second counter indicates an elapsed time since transmission of the second synchronization signal started.