Hole Detection and Healing in Hybrid Sensor Networks

Although monitoring and covering are fundamental goals of a wireless sensor network (WSN), the accidental death of sensors or the running out of their energy would result in holes in theWSN. Such holes have the potential to disrupt the primary functions of WSNs. This paper investigates the hole detection and healing problems in hybrid WSNs with non-identical sensor sensing ranges. In particular, we aim to propose centralized algorithms for detecting holes in a given region and maximizing the area covered by a WSN in the presence of environmental obstacles. To precisely identify the boundary of the holes, we use an additively weighted Voronoi diagram and a polynomial-time algorithm.Furthermore, since this problem is known to be computationally di cult, we propose a centralized greedy 2 -approximation algorithm to maximize the area covered by sensors. Finally, we implement the algorithms and run simulations to show that our approximation algorithm e ciently covers the holes by moving the mobile sensors.

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