A SURVEY ON NODE FAILURE RECOVERY ALGORITHMS IN WIRELESS SENSOR-ACTOR NETWORKS

This paper presents a review of node failure recovery algorithms in wireless sensor actor networks (WSANs). Due to wide area of innovation in wireless technology, WSANs have been the interesting area of application for last two or three decades in various fields. In WSANs, sensor node will explore the environment and transmit the gathered information to actor nodes. Actor node gathers or aggregates that information and performs specific operations in response to various events. Actors have to work together so it is essential to retain a strongly connected network topology at all the time. Since, actors perform in hostile environment, so they are prone to failures. Moreover a failure of an actor node leads to partition of the network into disjoint blocks and would thus violate the connectivity goal. For the recovery of faulty nodes, there is a requirement of location table for initiating the recovery process. There are several algorithms and methods that are proposed by various authors. The various algorithms implemented till date are Least Disruptive Topology Repair Algorithm (LeDiR),RIM(Reverse Invert Motion) algorithm, DARA(Divide actor recovery algorithm),PDARA(Partition detection actor recovery algorithm etc. These algorithms are based on two strategies of node repositioning and inward motion. This review paper deeply studies the methods that are proposed by various authors for the detection and recovery of actor failures in mobile sensor networks