A Handoff-Based And Limited Flooding (HALF) routing protocol in DTN

In a Delay Tolerant Network (DTN), it is a challenging job to develop a routing protocol. We have proposed a routing protocol named HALF (Handoff-based And Limited Flooding) in DTN that combines a handoff-based routing protocol with a limited flooding technique to make it suitable for both infra-structured and infra-structure less networking environment. In this paper, we have simulated and made comparison of HALF with other existing routing protocols of DTN under a wide range of network and traffic conditions. It is found that HALF gives satisfactory delivery ratio and latency under almost all conditions and different network scenarios when compared to the other existing DTN routing protocols. As the traffic intensity of the network grows from low (.2) to high (.75) values, HALF shows about 30% to 50% decrease in the delivery ratio and about 10% to 20% increase in the average latency. When the wireless radio range is increased from 10m to 250m, HALF shows 400% increase in delivery ratio and 40% decrease in the latency performance.