Abstract
In one random deployment, it is often assumed that the number of scattered sensors are more than that required by the critical sensor density. Otherwise, complete area coverage may not be guaranteed in this deployment, and some coverage holes may exist. Besides using more sensors to improve coverage, mobile sensor nodes can be used to improve network coverage. Mobile sensor nodes are equipped with mobile platforms and can move around after initial deployment. Although a mobile sensor node normally is more expensive than its stationary compeer, it can serve many functionalities and improve network coverage. The design of a node movement strategy usually needs to address the following question:
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