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Journal of Electrical and Computer Engineering
Volume 2014 (2014), Article ID 641720, 8 pages
http://dx.doi.org/10.1155/2014/641720
Research Article

Smart Power Management and Delay Reduction for Target Tracking in Wireless Sensor Networks

School of Electronic Information Northwestern Polytechnical University, Xi’an, China

Received 3 November 2013; Revised 16 January 2014; Accepted 7 February 2014; Published 11 March 2014

Academic Editor: Vincenzo Eramo

Copyright © 2014 Juan Feng et al. 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.

Abstract

Energy efficiency and data transmission delay are critical issues for mobile target tracking wireless sensor networks, in which abundant sensor nodes are deployed to collect the target information from the sensing field. At present, many existing works have been concentrated on extending network lifetime, while less emphasis was placed on both transmission delay reduction and the adaptive sleep of sensor nodes considering the application constraints. In this paper, we propose a smart power management and delay reduction approach for target tracking based on a grid network structure, where sensor nodes adjust their sleep intervals according to the distance between the node and the moving target. Sensor nodes can distributedly decide their sleeping time using the information from their neighbors. Furthermore, we propose a real-time chain to relay the sensed data for transmission delay reduction. The proposed approach allows sensor nodes that are far away from the target to sleep more and make the target information forward to the sink in time. Experimental results verify that, in contrast to adaptive coordinate and local power management protocols, the proposed approach achieves a significant energy saving while maintaining a short transmission delay.