Watchdog: Reduce time delay for spreading selfish information in manet

Mobile ad hoc networks are composed of mobile nodes connected by wireless links without using any pre-existent infrastructure. The communication in ad hoc network is multihop in nature, where each node forwards data packets to the other nodes thereby spending its resources such as battery power, CPU time and memory. In real world, many nodes may have a selfish behavior, being unwilling to forward packets to the other nodes in order to save resources. Typically, a selfish node will not cooperate in the transmission of packets which affects the network performance seriously. Watchdog detects the selfish nodes in the networks. Collaborative watchdog propagates the presence of the selfish node to the source node. The source node broadcasts the selfish information to all nodes. So there is a delay time in spreading selfish information over the network. An efficient approach is proposed to reduce the delay time in spreading the selfish information in the network. It involves broadcasting the selfish information and route request information from the previous node of a selfish node. If one node has previously detected a selfish node using its watchdog, it can broadcast the presence of selfish node over the network which included the route request packet. So the time delay in spreading selfish information over the network can be reduced.