Incorporating Mobility to Sensor Networks during Node Failure and Their Analysis for Radio Propagation Models

Abstract

Wireless sensor networks are expected to find wide applicability and increasingdeployment in the near future. It consists of spatially distributed autonomous sensors tomonitor physical or environmental conditions and to cooperatively pass their datathrough the network to a main location. The more modern networks are bi-directional,also enabling control of sensor activity. The development of wireless sensor networkswas motivated by military applications such as battlefield surveillance, many industrialand consumer applications, such as industrial process monitoring and control, machinehealth monitoring, and so on. The operation of WSN is normal under ordinaryconditions. But in case of an emergency situation, like fire breakout, one of the nodesdeployed in the area may get ruined. Under such circumstances, the data collectedaround the vicinity of the node may be lost. Such kinds of situations result in severepacket drop and thus decrease the communication throughput in medium access control(MAC) protocols. Hence, data aggregation and mobility has been put forward as anessential paradigm. In this paper, an alternative mechanism for node failure and arecovery scheme for the vast packet drop problem has been proposed. Here referencepoint group mobility model has been used for replacing the damaged node and theaftermath performances are analyzed for various radio propagation models. Thesimulation is carried out by means of NS2 (network simulator).

Keywords: Autonomous sensors, wireless sensor networks, data aggregationtechnique, emergency, transmission