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Delay-Constrained, Energy-Efficient Routing in Wireless Sensor Networks Through Topology Control

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3 Author(s)
Pothuri, P.K. ; Dept. of Comput. Sci., Oklahoma State Univ., Stillwater, OK ; Sarangan, V. ; Thomas, J.P.

In this paper, we investigate the problem of finding energy-efficient paths for delay-constrained data in wireless sensor networks. This problem has been shown to be NP-complete and current solutions for this problem are inadequate, as they do not model the delays introduced by the channel access mechanisms. We present a heuristic solution for the aforesaid problem that employs topology control for sensor networks using 802.11 like channel access schemes. We propose a network architecture and a routing framework that enable us to model the access delays caused by the MAC layer. This in turn, allows us to obtain better estimates for the end-to-end delays along various paths. We identify a set of paths between the source and sink nodes, and index them in increasing order of their energy consumption. We then estimate the end-to-end delay along each of these ordered paths, and select the one with the lowest index that satisfies the delay constraint. Our studies show that the proposed framework achieves a good balance between latency introduced in the transfer and energy consumption, when compared with conventional solutions

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Networking, Sensing and Control, 2006. ICNSC '06. Proceedings of the 2006 IEEE International Conference on

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