Distributed Coverage-Hole Repair Algorithm towards Nodes Failure in Wireless Sensor Networks

Abstract

In order to preserve the coverage and ensure the efficiency of Wireless Sensor Networks (WSNs), a distributed coverage-hole repair algorithm towards nodes failure is proposed in this paper. Every node has a energy threshold, if node’s energy is lower than its threshold, it sends a failure message to the nearest node and appoints it as the head node, the head node consideres all the neighbors of the failure node are preparatory boundary nodes at first, then judges every preparatory boundary nodes whether be a non-boundary node through the intersection angle with the failure node. In the last, the head node activates the redundant node within the sensing range of failure node which has the most boundary nodes as neighbor nodes. Analyzes and simulation on Matlab platform indicate that this algorithm has a low time complexity and the repair efficiency has a grate relation with node density and node sensing radius.

Coverage Restoration Method for Wireless Sensor Networks of Distributed PV System

“…After comprehensive consideration, the first power supply way is used for sink nodes and the third way is for ordinary nodes and cluster head nodes in this paper. In order to prevent the situation where redundant nodes with lower energy are awakened in the monitoring network, the energy threshold th is set to select redundant nodes with adequate energy [28]. If the redundant nodes do not meet the need of being waken up, they continue to sleep.…”