Routing Protocols in Delay Tolerant Network (DTN): A Critical Study and Comparison

Delay tolerant Network (DTN) became more popular in the research area recently, because of its application. It is a wireless network that communicate with the nodes by storing the message packets in the bundle temporally and whenever relay node or the intermediate node have the chance to send the message to the other node that just encountered by the relay node. The mechanism use for the DTN routing is the store-carry and forward approach. Main challenge for the DTN routing is that it discovers the route through the network without an end to end path so nodes in the network connect to the other nodes instantly. This paper review about DTN, types of routing techniques and its issues, some popular routing protocols and their performance in terms of Delay, message Delivery rate, Overhead, Controlling the number of replications of the node.