US Patent No. 9,237,539

METHOD AND APPARATUS FOR CORRECTING REFERENCE TIME FOR DISTRIBUTED TIME SYNCHRONIZATION


Patent No. 9,237,539
Issue Date January 12, 2016 
Title Method And Apparatus For Correcting Reference Time For Distributed Time Synchronization
Inventorship Hyun-jae Kim, Incheon (KR)
Jung Hyun Kim, Daejeon (KR)
Jihyung Kim, Daejeon (KR)
Kwang Jae Lim, Daejeon (KR)
DongSeung Kwon, Daejeon (KR)
Assignee ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Daejeon (KR)

Claim of US Patent No. 9,237,539

1. A method for a node to correct reference time in a wireless communication system formed of a plurality of nodes, the method
comprising:
receiving messages broadcasted from neighbor nodes;
calculating amounts of changes in receiving times that are differences between receiving times when the messages are currently
received and receiving times when the messages are previously received with respect to the neighbor nodes; and

correcting the reference time based on the amounts of changes calculated with respect to the neighbor nodes, including
summing the amounts of changes in the receiving times of the neighbor nodes to obtain a sum, and dividing the sum by the number
of nodes obtained by adding 1 to the number of neighbor nodes, to thereby calculate an average value; and

correcting the reference time using the average value.