A Threshold-Based Method to Detect Selfish Nodes in MANET

A mobile ad-hoc network (MANET) is a collection of mobile nodes, which communicate over radio. These networks have an important advantage; they do not require any existing infrastructure or central administration. Therefore, mobile ad-hoc networks are suitable for temporary communication links. This flexibility, however, comes at a price: communication is difficult to organize due to frequent topology changes. Due to the lack of infrastructure and the limited transmission range of a node in a mobile ad hoc network, a node has to rely on neighbour nodes to route a packet to the destination node. So, in order to save its own resources, node can turn selfish and stops forwarding the packets of other nodes. These misbehaviours of the selfish nodes will impact the efficiency, reliability and fairness in MANET. In this paper, we propose a threshold based method to detect the selfish nodes and exclude it from the network. Finally, we will use ns-2 simulator to observe the performance of proposed algorithm in detecting selfish nodes.