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Opportunistic network is a type of Delay Tolerant Network which ischaracterized by intermittent connectivity amongst the nodes and communicationlargely depends upon the mobility of the participating nodes. The network beinghighly dynamic, traditional MANET protocols cannot be applied and the nodesmust adhere to store-carry-forward mechanism. Nodes do not have the informationabout the network topology, number of participating nodes and the location ofthe destination node. Hence, message transfer reliability largely depends uponthe mobility pattern of the nodes. In this paper we have tried to find theimpact of RWP (Random Waypoint) mobility on packet delivery ratio. We estimatemobility factors like number of node encounters, contact duration(link time)and inter-contact time which in turn depends upon parameters like playfieldarea (total network area), number of nodes, node velocity, bit-rate and RFrange of the nodes. We also propose a restricted form of RWP mobility model,called the affinity based mobility model. The network scenario consists of asource and a destination node that are located at two extreme corners of thesquare playfield (to keep a maximum distance between them) and exchange datapackets with the aid of mobile 'helper' nodes. The source node and thedestination node are static. The mobile nodes only help in relaying themessage. We prove how affinity based mobility model helps in augmenting thenetwork reliability thereby increasing the message delivery ratio and reducemessage delivery latency.

Improving Network Performance with Affinity based Mobility Model in Opportunistic Network