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There are some shortcomings in the delay tolerant network (DTN) routing algorithm, such as low message delivery rate, low network efficiency and high cost in the satellite network. In order to solve the problem above, this paper proposes a limited copy algorithm MPWLC based on service probability. In MPWLC, not only is the number of copies limited, but the storage resources of the satellite are also...
Delay Tolerant Network (DTN) is a wireless network that connected in an intermittently manner and have dynamic topology. In DTN to design protocol routing is a big challenge due to there is no end-to-end path. To overcome this challenge there is protocol routing dLife. dLife is a protocol routing in DTN that use two utility function to determine forwarding decision, namely TECD (Time-Evolving Contact...
In this paper, we evaluate and compare the performance of single-copy and multiple-copy routing protocols in a realistic Vehicular Delay Tolerant Network (VDTN) scenario. The simulations are conducted with the Opportunistic Network Environment (ONE) simulator. The performance is analyzed using delivery probability, overhead ratio, average latency, average number of hops and average buffer time metrics...
In this work, we evaluate the performance ofthree routing protocols epidemic, sprayandwait and maxpropin Vehicular Delay Tolerant Networks (VDTNs). We study theimpact of vehicles density and ttl on the network performance. The simulations are conducted with the Opportunistic NetworkEnvironment (ONE) simulator. The performance is analyzedusing delivery probability, overhead ratio, average latencyand...
We call "Violent" (from portuguese: velocity and direction), a context-aware routing protocol that aims at obtaining and processing environment data such as velocity and direction of nodes as they establish contacts with each other in delay-tolerant networks (DTNs). This context information is used by the proposed algorithm - along with the node's position and time of the last encounter...
Unlike the conventional routing techniques in the Internet where routing privileges are given to trustworthy and fully authenticated nodes, Delay Tolerant Networks (DTNs) allow any node to participate in routing due to the lack of consistent infrastructure and central administration. This creates new security challenges as even authorized nodes in DTNs could inject several malicious threats against...
The message deliveries based on the store-carry-forward routing schemes, such as Epidemic Routing(ER), are one of useful methods for communication under challenged environments. However, these methods commonly have their own limitations in reach ability of messages to destinations and scalability. For example, as the distance to the destination increases, the delivery delay of a message between source...
When low power mobile devices communicate over short range wireless networks using technologies such as WiFi, Bluetooth, ZigBee etc., the contacts are often opportunistic and intermittent due to range, mobility and energy constraint. While the DTN architecture provides a framework to support opportunistic and intermittent connectivities, existing DTN routing algorithms do not consider application...
Various information delivery schemes based on store-carry-forward routing with extensions have been studied as part of efforts to support non-real-time communications in sparse or intermittent networks. However, communication service schemes that cover large areas based solely on store-carry-forward technology have previously been considered impractical because the delay time for message delivery...
In delay tolerant networks (DTN), flooding mechanism in epidemic routing protocol may waste network resources. Based on introducing and analyzing routing protocols in DTN, this paper proposes an improved protocol of epidemic routing (EPI-HT). EPI-HT forwards messages accurately to the next-hop according to historical information between nodes and node localization principle. Simulation results indicate...
Delay Tolerant Networks (DTNs) are characterized by intermittent connectivity, high delay and without end-to-end path from the source to the destination. The fundamental way of message routing in DTNs is store-and-forward. Thus, the mal-behaving nodes in the networks, which are uncooperative to relay messages, will significantly undermine the routing performance. In this paper, we propose a novel...
Delay-Tolerant Networks(DTN) are wireless networks where disconnections may occur frequently due to node mobility, power outages and propagation phenomena. In order to achieve data delivery, store-and-forward protocols are used in DTN and routing protocols based on epidemic message dissemination has been proposed, such as Epidemic routing. Under Epidemic routing, packets can be completely delivered...
Communication networks are traditionally assumed to be connected. However, in delay and disruption tolerant networks(DTN), there are many unconventional difficulties, such as intermittent connectivity, large delay and may never have an end-to-end contemporaneous path, a node has to store-and-carry messages for a long time, until a new forwarding opportunity arises. Because every node needs to store...
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