Energy-efficient cooperative communication in clustered wireless sensor networks

Authors:
Zhong Zhou;Shengli Zhou;Shuguang Cui;Jun-Hong Cui
Affiliations:
Department of Computer Science and Engineering, University of Connecticut, Storrs, CT;Department of Electrical and Computer Engineering, University of Connecticut, Storrs, CT;Department of Electrical and Computer Engineering, University of Arizona, Tucson, AZ;Department of Computer Science and Engineering, University of Connecticut, Storrs, CT
Venue:
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
Year:
2006

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Abstract

We study a clustered wireless sensor network where sensors within each cluster forward the message to another cluster via cooperative communication techniques. Only those sensors that correctly decode the packet from the source can participate in the subsequent cooperative communication. Hence, the number of cooperating sensors is a random variable depending on both channel and noise realizations. We formulate a multivariable optimization problem to minimize the overall energy consumption. With numerical methods, we investigate how the energy efficiency is affected by the transmit power allocation, the total number of sensors in a cluster, the end-to-end packet error rate requirement, and the relative magnitudes of intra-cluster and inter-cluster distances.