Fault Tolerance Mechanism in WSN's through Recovery Nodes

During recent years, usage of wireless sensor networks (WSNs) has been increased because of its huge potential to interconnect the physical world to the virtual world. To increase the quality of service (QoS) in WSNs, large numbers of portable wireless sensor nodes have been deployed. The failure of these sensor nodes will affect the QoS. To maintain better QoS, faulty nodes need to be identified. In the proposed method, sensor node failures are identified by calculating the round trip delay (RTD) of discrete round trip paths (RTP) and analysing them with threshold value. Once the faulty nodes are detected, neighbour nodes (Recovery Nodes) that have higher energy are selected for further transmission. By this approach, the quality of service (QoS) in WSNs can be improved. Simulation results using the NS2 simulator shows the transmission in WSNs even in the presence of faulty nodes.