Routing in Delay Tolerant Network

At present, the internet has grown exponentially due to its wide connectivity with different sets of devices. The only issue is the tolerances towards delay which leads to disconnection in case the delay is above tolerance level. Delay Tolerant Network (DTN) is the latest development to sustain longer delays by allowing disconnected operations. Among the various problems like buffering, resources allocation and energy consumption, routing is a major issue. The present study reviews many proposals regarding routing problem and its solution and the state of the art analysis is presented. General Terms Networks, delay, flooding, forwarding.