A Handoff-based And Limited Flooding (HALF) Routing Protocol in Delay Tolerant Network (DTN)

In a Delay Tolerant Network (DTN), routing protocols are developed to manage the disconnected mobilenodes. We propose a routing protocol named HALF (Handoff-based And Limited Flooding) in DTN thatcan work in both infra-structured and infra-structure less networking environment and hence it canimprove the performance of the network significantly. In this paper, it is shown that HALF givessatisfactory delivery ratio and latency under almost all conditions and different network scenarios whencompared to the other existing DTN routing protocols. As the traffic intensity of the network grows fromlow (.2) to high (.75) values, HALF shows about 5% decrease in the delivery ratio compare to muchlarger values showed by the other routing protocols and on the average takes same time to deliver all themessages to their destinations. As the radio range is increased over the range from 10m Bluetooth rangeto 250m WLAN range, due to the increased connectivity, the delivery ratio and the latency are increasedby 4 times and decreased by 5 times respectively.