A Survey: Various Congestion Control Strategies for Routing in Delay Tolerant Networks

Delay Tolerant Networks

Delay-Tolerant Networks are characterized by lack of continuous end-to-end path connections between source and destination due to - node’s mobility, limited power sources and data storage space. DTN use store-carry and forward mechanism, which givers high performance with respect to delivery ratio but there is a fair chance of a communicating node being congested and high packet overheads. Existing Routing Techniques which focus either on Flooding based routing techniques or Forwarding based Routing Techniques, in which all intermediate nodes and high probable nodes are being congested respectively. In Social Routing, packets are only passes through nodes which are having high social contact strength and high popularity. So there will be congestion at popular nodes. So there is a need to reduce congestion at popular nodes to improve performance of social routing, reduce overheads and efficient movement of signal message. This paper describes survey of various strategies of congestion control and avoidance. Which can lead to precious resources such as buffer and battery life of nodes will be saved and overall performance of social routing can be increased in terms of traffic load in network and total message overhead .

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