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Title: Opportunity-based topology control in wireless sensor networks
Authors: Liu, Yunhuai
Zhang, Qian
Ni, Lionel M.
Keywords: Topology control
Wireless sensor networks
Distributed algorithm
Reliability theory
Guaranteed performance
Issue Date: 2008
Citation: Proceedings 28th IEEE International Conference on Distributed Computing Systems, Beijing, China, 17-20 June 2008, p. 419-426
Abstract: Topology control is an effective method to improve the energy efficiency of wireless sensor networks (WSNs). Traditional approaches are based on the assumption that a pair of nodes is either “connected” or “disconnected”. These approaches are called connectivity-based topology control. In real environments however, there are many intermittently connected wireless links called lossy links. Taking a succeeded lossy link as an advantage, we are able to construct more energy-efficient topologies. Towards this end, we propose a novel opportunity-based topology control. We show that opportunity-based topology control is a problem of NPhard. To address this problem in a practical way, we design a fully distributed algorithm called CONREAP based on reliability theory. We prove that CONREAP has a guaranteed performance. The worst running time is O(|E|) where E is the link set of the original topology, and the space requirement for individual nodes is O(d) where d is the node degree. To evaluate the performance of CONREAP, we design and implement a prototype system consisting of 50 Berkeley Mica2 motes. We also conducted comprehensive simulations. Experimental results show that compared with the connectivity-based topology control algorithms, CONREAP can improve the energy efficiency of a network up to 6 times.
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