Survey of Acknowledgement based Vector Routing for Opportunistic Networks.

Opportunistic networks are one of the most challenging area of interest MANETs. Here nodes communicate with each other when they get opportunity because path joining two mobile nodes never exists. Again nodes do not contain any knowledge about the network terminology. If they want to deliver message to the destination the routes are built dynamically furthermore, nodes are not having or possess any knowledge about the network terminology and any intermediate node selected as a next hop which brings the message closer up to the destination. These requirements make opportunistic networks most interesting evolutions of MANETs & challenging and promising research field. In this paper we describe composite approach for routing in opportunistic networks, considering traditional different routing protocols unable to deliver messages between hosts. Thus, there is a need for a path to route from source to destination through such networks. We propose composite approach which combines Epidemic Routing and Probabilistic Routing approaches together. When two hosts come into contact of one another, they exchange their summary vectors to determine which messages stored remotely have not been seen by the local host. In turn, each host then requests copies of messages that it has not yet seen. When message reaches to destination, acknowledgment is sent in the same manner to the sender of the message.