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Wireless sensor network is an emerging field which is accomplishing much importance because of its vast contribution in varieties of applications. Wireless sensor networks are used to monitor a given field of interest for changes in the environment. Coverage is one of the main active research interests in WSN. In this paper, the authors aim to review the coverage problem In WSN and the strategies that are used in solving coverage problem in WSN. These strategies studied are used during deployment phase of the network. Besides this they also outlined some basic design considerations in coverage of WSN. They also provide a brief summary of various coverage issues and the various approaches for coverage in Sensor network.
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