Delay and Disruption Tolerant Networks (DTN) can provide an underlying base to support mobility environments. DTN is equipped with advance features such as custody transfer and hop by hop routing which can tackle the frequent disconnections of mobile devices by buffering bundles and dynamically making hop-by-hop routing decisions under intermittent connectivity environment. In this paper, we have proposed a DTN routing protocol HALF (Handoffbased And Limited Flooding) which can manage and improve performance of disrupted and challenging communication between mobile nodes in the presence of an infrastructure network consisting of fixed interconnected nodes (routers). HALF makes use of the general handoff mechanisms intended for the IP network, in a DTN way and also integrates a limited flooding technique to it. Simulation results show that HALF attains better performance than other existing DTN routing protocols under diverse network conditions. As the traffic intensity changes from low to high, delivery ratio of other DTN routing protocols decreased by 50% to 75% whereas in HALF such ratio is reduced by less than 5%. HALF can deliver about 3 times more messages than the other protocols when the disrupted network has to deal with larger size of messages. If we calculate the overhead ratio in terms of "how many extra (successful) transfer" is needed for each delivery, HALF gives less than 20% overhead ratio while providing a good delivery ratio.
In a Delay Tolerant Network (DTN), routing protocols are developed to manage the disconnected mobile nodes. We propose a routing protocol named HALF (Handoff-based And Limited Flooding) in DTN that can work in both infra-structured and infra-structure less networking environment and hence it can improve the performance of the network significantly. In this paper, it is shown 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 5% decrease in the delivery ratio compare to much larger values showed by the other routing protocols and on the average takes same time to deliver all the messages to their destinations. As the radio range is increased over the range from 10mBluetooth range to 250m WLAN range, due to the increased connectivity, the delivery ratio and the latency are increased by 4 times and decreased by 5 times respectively.
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.
Abstract-Numbers of mobile devices are sharply increasing in recent years. To deal with this mobility tendency, Delay and Disruption Tolerant Networks (DTN) has received significant research focus. In that context, infrastructure based DTN has promising application perspectives. In this paper, we present a route caching mechanism for infrastructure based DTN communication where the infrastructure connects multiple DTN regions. Our proposed mechanism reduces flooding of DTN messages in the infrastructure significantly when message are passed through the infrastructure. We evaluated this route caching mechanism in three flooding based DTN routing protocols. Simulations on an actual urban map show that the delivery ratio of the whole network increased greatly (by 25% to 81%) as well as overhead also decreases (maximum 50%).
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