Abstract
In recent years, P2P file sharing has been widely embraced and becomes the largest application of the Internet traffic. And the development 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 sparse distribution, VANETs are divided and links are interrupted intermittently. At this moment, VANETs may become Vehicle-based Delay Tolerant Network (VDTNs). Therefore, this work proposes an Optimal Fragmentation-based Multimedia Transmission scheme (OFMT) based on P2P lookup protocol in VDTNs, which can enable multimedia files to be sent to the receiver fast and reliably in wireless mobile P2P networks over VDTNs. In addition, a method of calculating the most suitable size of the fragment is provided, which is tested and verified in the simulation. And we also show that OFMT can defend a certain degree of DoS attack and senders can freely join and leave the wireless mobile P2P network. Simulation results demonstrate that the proposed scheme can significantly improve the performance of the file delivery rate and shorten the file delivery delay compared with the existing schemes.
Highlights
The applications of peer-to-peer (P2P) networks have been growing at tremendous speed these past few years
(2) We present a multimedia transmission mechanism named optimal fragmentation-based multimedia transmission scheme (OFMT) based on P2P lookup protocol, which can be applied to vehicle-based delay tolerant networks (VDTNs)
We find that when the seed of the movement model is set to 1, 2, and 4, the corresponding curves can obtain the maximum at the third point where the fragment size is 100 KB and the curves whose movement seed is 3, 5 can obtain the maximum at the second point where the fragment size is 50 KB, while the fourth point where the fragment size is about 150 KB in every curves is found by our OFMT scheme (M = the average duration of the network links/5)
Summary
The applications of peer-to-peer (P2P) networks have been growing at tremendous speed these past few years. We propose an optimal fragmentationbased multimedia transmission scheme (OFMT) based on P2P lookup protocol, which allows multimedia files to be transmitted to the receiver fast and reliably in the mobile P2P networks over VDTNs. In addition, there is no need for a centralized control point, and senders can freely join and leave from the wireless mobile P2P network. The size of each fragment directly affects the efficiency of file transmission, for example, fragment delivery rate, transmission delay, network load, and so on (2) We present a multimedia transmission mechanism named optimal fragmentation-based multimedia transmission scheme (OFMT) based on P2P lookup protocol, which can be applied to VDTNs In the meantime, it explores the full potential of each source nodes; the performance of multimedia file transmission achieves significant results including improving the fragment delivery rate and reducing the transmission delay.
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