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Sensors 2009, 9(1), 56-85; doi:10.3390/s90100056

Clock Synchronization in Wireless Sensor Networks: An Overview

1, 2
2,*  and 3
1 Key Laboratory of Biomimetic Sensing & Advanced Robot Technology, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, P.R. China 2 Department of Electrical and Computer Engineering, Texas A&M University / TAMU 3128, College Station, TX 77840-3128, USA 3 Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong
* Author to whom correspondence should be addressed.
Received: 19 November 2008 / Revised: 15 December 2008 / Accepted: 5 January 2009 / Published: 6 January 2009
(This article belongs to the Special Issue Sensor Algorithms)
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The development of tiny, low-cost, low-power and multifunctional sensor nodes equipped with sensing, data processing, and communicating components, have been made possible by the recent advances in micro-electro-mechanical systems (MEMS) technology. Wireless sensor networks (WSNs) assume a collection of such tiny sensing devices connected wirelessly and which are used to observe and monitor a variety of phenomena in the real physical world. Many applications based on these WSNs assume local clocks at each sensor node that need to be synchronized to a common notion of time. This paper reviews the existing clock synchronization protocols for WSNs and the methods of estimating clock offset and clock skew in the most representative clock synchronization protocols for WSNs.
Keywords: Wireless sensor networks; Clock synchronization; Clock offset; Clock skew Wireless sensor networks; Clock synchronization; Clock offset; Clock skew
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Rhee, I.-K.; Lee, J.; Kim, J.; Serpedin, E.; Wu, Y.-C. Clock Synchronization in Wireless Sensor Networks: An Overview. Sensors 2009, 9, 56-85.

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