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With the development of mobile internet, wireless communications via mobile devices in the form of Delay Tolerant Networks (DTNs), becomes a hot research topic. One critical issue in the DTNs with social characteristics is that there could exist selfish nodes which are unwilling to forward messages from strangers and malicious nodes which intentionally impair normal communication. Although there are...
With the development of mobile internet, wireless communications via mobile devices, which is typically in the form of Delay Tolerant Networks (DTNs), becomes a hot research topic. One critical issue in the development of DTNs is the routing. Although there are a lot research works addressing routing issues in DTNs, they handle routing problem from only one or two aspects, which cannot produce an...
Delay Tolerant Networks (DTN) is a kind of sparse Ad Hoc networks in which no contemporaneous path exists between any two nodes most of the time. Multicasting in DTN is a desirable feature for applications where some form of group communication is in demand. In this paper, we propose a multicast protocol for DTN: ECAM (Epidemic-based Controlled Flooding and Adaptive Multicast for Delay Tolerant Networks)...
In Vehicular Ad-hoc Network (VANET), the multi-hop routing frequently breaks off, which has a negative effect on the reliability and transmission quality of the network. The paper proposes a new routing algorithm based on the geographical position, called Multi-Priority Opportunistic Directional Routing (MPODR). The algorithm improves the existing Opportunistic Directional Forwarding Strategy from...
The IEEE 802.16/WiMAX mesh network, which is dynamically self-organized and self-configured, is a promising solution for wireless broadband access in metropolitan scale with a cost-effective deployment. As in most wireless multi-hop networks, traffic scheduler in MAC is one of most important factor for the performance of 802.16 mesh networks. Two scheduling modes, centralized scheduling and distributed...
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...
In disruption tolerant networks, aggressive packet forwarding scheme like flooding has a major drawback in terms of network congestion. In this paper, we proposed a new routing algorithm, called adaptive randomized epidemic routing (ARER). ARER dynamically adjusts the forwarding probability for each message according to a new metric, replications density. Meanwhile, ARER arranges the forwarding sequence...
Delay tolerant networks (DTNs) use a store-carry-forward communication model relying on the mobility of nodes because a persistent end-to-end path from source to destination generally does not exist. Epidemic routing is a typical protocol in which data can be replicated along multiple opportunistic paths. With the advent of network coding, it is intuitive that data can not only be replicated, but...
In Disruption Tolerant Networks, simply flooding packet scheme has a major drawback in terms of network congestion. This paper proposes a new routing algorithm, called Adaptive Priority Routing with Ack_mechanism (APRA). APRA arranges the forwarding sequence and the dropping sequence based on their assigned priority. The priority is determined by the TTL, Delivery Predictability, and Replication Density...
In disruption tolerant networks, aggressive packet forwarding scheme like flooding has a major drawback in terms of network congestion. In this paper, we proposed a new routing algorithm, called directional forward routing (DFR). DFR caches the position information of neighbors, and selects the appropriate relays according to the directional angles among these neighbors and the destination. Meanwhile,...
Epidemic Routing is an original and effective multicopy routing algorithm in disruption tolerant networks. However, its performance degrades significantly when network resources are limited. In this paper, we proposed a new routing scheme, called Weighted Epidemic Routing (WER). WER appropriately arranges the priority of messages for forwarding or deleting through assigning a weight for each of them...
Since most ad hoc mobile devices today operate on batteries, the power consumption becomes an important issue. This paper proposes a cross-layer design of energy-aware ad hoc on-demand distance vector (CEAODV) routing protocol which adopts cross-layer mechanism and energy-aware metric to improve AODV routing protocol to reduce the energy consumption and then prolong the life of the whole network....
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