NDLI: ETSP: An Energy-Efficient Time Synchronization Protocol for Wireless Sensor Networks

Content Provider	IEEE Xplore Digital Library
Author	Shahzad, K. Ali, A. Gohar, N.D.
Copyright Year	2008
Description	Author affiliation: NUST, Rawalpindi (Shahzad, K.; Ali, A.; Gohar, N.D.)
Abstract	Wireless sensor networks (WSN) have specific constraints and stringent requirements in contrast to traditional wired and wireless computer networks. Among these specific requirements, energy-efficiency is the most prominent. Sensor motes have finite amount of energy supply. In most WSN applications, hundreds or thousands of motes are deployed in an area (e.g., behind enemy lines or foliage) and there is no provision for battery recharging. Therefore, a fundamental constraint on WSN applications and services is to extend the network's lifetime by making the batteries run longer. In this paper we propose an energy-efficient time synchronization protocol, referred as ETSP, which gives significant improvement in energy consumption over existing time synchronization schemes. We first evaluate the existing reference broadcast synchronization (RBS) and time-sync protocol for sensor networks (TPSN), which are two prominent examples of receiver-receiver and sender-receiver synchronization methods. This performance analysis demonstrates that combination of RBS and TPSN can work better than using these techniques separately. In the proposed ETSP protocol, we identify conditions to toggle between RBS and TPSN based on a threshold value. We experimentally and mathematically derive an optimal value of the switching threshold for different sensor motes. In this way we effectively reduce the number of transmissions which results in saving energy. Moreover, we assess the performance of our protocol on the bit error traces collected over a real WSN test bed to cater for retransmissions overload for the time synchronization protocols under consideration.
Starting Page	971
Ending Page	976
File Size	364794
Page Count	6
File Format	PDF
ISBN	9780769530963
DOI	10.1109/WAINA.2008.181
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-03-25
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Energy consumption Wisreless Sensor Networks Wireless application protocol Batteries Application software Energy Efficiency Transmissions Wireless sensor networks Broadcasting Energy efficiency Computer networks Performance analysis Testing
Content Type	Text
Resource Type	Article

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