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Sensor networks consist of small wireless sensor nodes deployed randomly over an area to monitor the environment or detect intrusion. The coverage provided by sensor networks is very crucial to their effectiveness. Many of the important applications of sensor networks demand autonomous mobility for the sensor nodes. Early failure of sensor nodes can lead to coverage loss that requires coverage maintenance schemes. The process of moving a node to a new location for maintenance of coverage is termed migration. The comparison of the performance of the different algorithms in terms of the improvement in coverage, average migration distance of the nodes and the lifetime of the network is also presented from one survey.
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