A Fuzzy Logic Based Sensor Relocation Betterment for Mobile Wireless Sensor Networks

Using mobile sensor networks has increased as well in recent years. It is because of the movement ability of sensor nodes which can be very useful in such networks. Having failure for network nodes occurs usually in wireless sensor networks which can be avoided by having the ability of movement in sensor nodes. It means that when a node fails consequently a hole appears in the coverage area of the network. By moving mobile nodes in a mobile sensor network the holes can be covered. This process should not lead the network to have much increasing in energy consumption factor. In this paper we present an algorithm for wireless mobile sensor networks to achieve at full coverage during network functioning. This algorithm assumes some redundant nodes in the network using for removing possible holes from coverage area. The presented algorithm executes in two phases: recognizing redundant nodes and selecting best ones for relocating that are both managed by cluster heads. Also the proposed method employs fuzzy logic to find out the best path for moving the nodes. Simulation results demonstrate that using the presented algorithm has significant improvement in exploring the redundant nodes and relocating operations in comparison with similar works. Also this algorithm has decreased energy consumption in relocation operations and consequently caused increasing in network lifetime.