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Sensors 2014, 14(8), 14744-14764; doi:10.3390/s140814744

A Group Neighborhood Average Clock Synchronization Protocol for Wireless Sensor Networks

1,* , 1
and
2
1
Department of Automation, Shanghai University, Shanghai 200072, China
2
School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore
*
Author to whom correspondence should be addressed.
Received: 12 May 2014 / Revised: 21 July 2014 / Accepted: 4 August 2014 / Published: 12 August 2014
(This article belongs to the Section Sensor Networks)
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Abstract

Clock synchronization is a very important issue for the applications of wireless sensor networks. The sensors need to keep a strict clock so that users can know exactly what happens in the monitoring area at the same time. This paper proposes a novel internal distributed clock synchronization solution using group neighborhood average. Each sensor node collects the offset and skew rate of the neighbors. Group averaging of offset and skew rate value are calculated instead of conventional point-to-point averaging method. The sensor node then returns compensated value back to the neighbors. The propagation delay is considered and compensated. The analytical analysis of offset and skew compensation is presented. Simulation results validate the effectiveness of the protocol and reveal that the protocol allows sensor networks to quickly establish a consensus clock and maintain a small deviation from the consensus clock. View Full-Text
Keywords: wireless sensor networks; clock synchronization; convergence; consensus clock wireless sensor networks; clock synchronization; convergence; consensus clock
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Lin, L.; Ma, S.; Ma, M. A Group Neighborhood Average Clock Synchronization Protocol for Wireless Sensor Networks. Sensors 2014, 14, 14744-14764.

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