Improvement and Performance Evaluation for Multimedia Files Transmission in Vehicle-Based DTNs

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Hindawi Publishing Corporation
International Journal of Distributed Sensor Networks
Volume 2013, Article ID 358267, 10 pages

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In recent years, P2P file sharing has been widely embraced and becomes the largest application of the Internet traffic. And thedevelopment of automobile industry has promoted a trend of deploying Peer-to-Peer (P2P) networks over vehicle ad hoc networks(VANETs) for mobile content distribution. Due to the high mobility of nodes, nodes’ limited radio transmission range and sparsedistribution, VANETs are divided and links are interrupted intermittently. At this moment, VANETs may become Vehicle-basedDelay Tolerant Network (VDTNs). Therefore, this work proposes an Optimal Fragmentation-based Multimedia Transmissionscheme (OFMT) based on P2P lookup protocol in VDTNs, which can enable multimedia files to be sent to the receiver fast andreliably in wireless mobile P2P networks over VDTNs. In addition, a method of calculating the most suitable size of the fragmentis provided, which is tested and verified in the simulation. And we also show that OFMT can defend a certain degree of DoS attackand senders can freely join and leave the wireless mobile P2P network. Simulation results demonstrate that the proposed schemecan significantly improve the performance of the file delivery rate and shorten the file delivery delay compared with the existingschemes.

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