Direct multi-hop time synchronization with constructive interference

Authors:
Yin Wang;Gaofeng Pan;Zhiyu Huang
Affiliations:
Tsinghua University, Beijing, China;Science and technology on communication information security control laboratory, Jiaxing, Zhejiang Province, China;Chinese Academy of Sciences, Beijing, China
Venue:
Proceedings of the 11th international conference on Information Processing in Sensor Networks
Year:
2012

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Abstract

Multi-hop time synchronization in wireless sensor networks (WSNs) is often time-consuming and error-prone due to random time-stamp delays for MAC layer access and unstable clocks of intermediate nodes. Constructive interference (CI), a recently discovered physical layer phenomenon, allows multiple nodes transmit and forward an identical packet simultaneously. By leveraging CI, we propose direct multi-hop (DMH) time synchronization by directly utilizing the time-stamps from the sink node instead of intermediate nodes, which avoids the error caused by the unstable clock of intermediate nodes. DMH doesn't need decode the flooding time synchronization beacons. Moreover, DMH explores the linear regression technique in CI based time synchronization to counterbalance the clock drifts due to clock skews.