In a wireless senor network, one of the main design challenges is to achieve long network lifetime by turning off some redundant sensor nodes while maintaining sufficient coverage for sensing and connectivity. In this paper, two improved algorithms are proposed, the first one is to find if a sensor is completely covered by its neighbors so as to decide whether it is redundant and can be used to replace failed nodes. The second algorithm is to relocate the failed node by a proper one. Simulation results show that the redundant discovery algorithm can computes all redundant nodes, and relocation algorithm can significantly reduce the energy consumption.
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