Coverage-aware sleep scheduling for cluster-based sensor networks

Authors:
Fangyang Shen;Min-Te Sun;Chunlei Liu;Andres Salazar
Affiliations:
Department of CET, Northern New Mexico College, Espanola, NM;Department of CSIE, National Central University, Chung-Li, Tao-Yuan, Taiwan;Department of Math&CS, Valdosta State University, Valdosta, GA;Department of CET, Northern New Mexico College, Espanola, NM
Venue:
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Year:
2009

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Abstract

In cluster-based sensor networks, part of the sensor nodes can be switched into a sleep state in order to conserve energy if their neighbors can provide the same or almost the same sensing coverage. However, as the number of nodes in the sleep state increases, coverage for the cluster is degraded. It is crucial to maintain high coverage of clusters in order to preserve performance. In this paper, we propose a coverageaware sleep scheduling (CS) algorithm to improve the coverage of each cluster. Compared with two previous schemes: the randomized scheduling (RS) scheme and the distance-based scheduling (DS) scheme, the CS algorithm maintains higher coverage, while guaranteeing the same lifetime for the cluster. The CS algorithm thus improves the overall performance of the cluster-based sensor networks.