Routing Approaches of Delay Tolerant Networks

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©2010 International Journal of Computer Applications (0975 - 8887) Volume 1 – No. 17

Routing Approaches in Delay Tolerant Networks: A Survey
R. J. D'Souza
National Institute of Technology Karnataka, Surathkal, India

Johny Jose
National Institute of Technology Karnataka, Surathkal, India

Delay Tolerant Networks (DTNs) have evolved from Mobile Ad Hoc Networks (MANET). It is a network, where contemporaneous connectivity among all nodes doesn’t exist. This leads to the problem of how to route a packet from one node to another, in such a network. This problem becomes more complex, when the node mobility also is considered. The researchers have attempted to address this issue for over a decade. They have found that communication is possible in such a challenged network. The design of routing protocol for such networks is an important issue. This work surveys the literature and classifies the various routing approaches. discontinuity in the network. There are also methods that have employed additional mobile nodes, to provide better message delivery. Researchers are even exploring how the social interaction of humans can be utilized for routing in a DTN. This survey has made an extensive study of the various routing strategies taken by the researchers in the past few years. We have classified them based on the type of knowledge used for routing.

Knowledge about the network helps in deciding the best next hop. It can happen that the network has absolutely no knowledge about the network. In such a scenario, all nodes are made relay nodes. Such schemes are called epidemic routing schemes. The basic concept of epidemic routing is to flood the packets, like the virus spreading in an epidemic. That is, a node copies its message to all the nodes that come in contact with it, provided the recipient node does not have a copy of…...

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