Repair Policies of Coverage Holes in Wireless Sensor Networks

The failed nodes lead to the phenomenon of coverage holes in Wireless Sensor Networks(WSN),which is due to the exhausted energy and destroyed environment.The Best Fit Node Policy is proposed to repair coverage holes of WSN.The mean idea of the Best Fit Node Policy is that the coverage holes in the WNS are detected to find the failed nodes in the base station of the network and selected the closest inactive node which is surrounded by the smallest coverage circle nodes of polygon to replace the failed nodes and then the closest inactive node is activated to repair the coverage holes.The simulation results show that the Best Fit Node Policy can maintain better quality of coverage,and make full use of energy resources,and extent lifetime of networks,moreover,BFNP is superior to Coverage Hole Patching Algorithm(CHPA).