Abstract
With the development of mobile Internet, wireless communication via mobile devices has become a hot research topic, which is typically in the form of Delay Tolerant Networks (DTNs). One critical issue in the development of DTNs is routing. Although there is a lot research work addressing routing issues in DTNs, they cannot produce an advanced solution to the comprehensive challenges since only one or two aspects (nodes' movements, clustering, centricity and so on) are considered when the routing problem is handled. In view of these defects in the existing works, we propose a novel solution to address the routing issue in social DTNs. By this solution, mobile nodes are divided into different clusters. The scheme, Spray and Wait, is used for the intra-cluster communication while a new forwarding mechanism is designed for the inter-cluster version. In our solution, the characteristics of nodes and the relation between nodes are fully considered. The simulation results show that our proposed scheme can significantly improve the performance of the routing scheme in social DTNs.
Highlights
A Delay Tolerant Network (DTN) presents a new communication model, which due to the nature of the network uses a store-carry-forward approach to deliver messages
The simulation results show that our proposed scheme can significantly improve the performance of the routing scheme in social DTNs
We mainly focus on the DTNs with social characteristics, called social DTNs
Summary
A Delay Tolerant Network (DTN) presents a new communication model, which due to the nature of the network uses a store-carry-forward approach to deliver messages. Considering the characteristics of social DTNs, there are several issues that need to be solved They include: (1) the reduction of messages dropped due to the unreliability of the wireless communication links; (2) the need for a mobility model which can accurately reflect real scenarios; (3) the need for a mechanism which can make full use of the social features of the mobile nodes and the relationships among them. Our major contributions presented in this paper include: (1) a mobility model which can accurately describe real scenarios; (2) a dynamic clustering mechanism which highlights the community characteristics of the social DTNs; (3) a new routing mechanism which takes full advantages of the characteristics of the active nodes; (4) the network coding mechanism employed to reduce the negative effects caused by the unreliability of the wireless communication channels.
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