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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. <\/jats:p>","DOI":"10.1155\/2013\/358267","type":"journal-article","created":{"date-parts":[[2013,3,17]],"date-time":"2013-03-17T21:00:33Z","timestamp":1363554033000},"page":"358267","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":2,"title":["Improvement and Performance Evaluation for Multimedia Files Transmission in Vehicle-Based DTNs"],"prefix":"10.1177","volume":"9","author":[{"given":"Di","family":"Wu","sequence":"first","affiliation":[{"name":"School of Computer Science and Engineering, Dalian University of Technology, Dalian 116023, China"}]},{"given":"Dongxia","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Computer Science and Engineering, Dalian University of Technology, Dalian 116023, China"}]},{"given":"Guozhen","family":"Tan","sequence":"additional","affiliation":[{"name":"School of Computer Science and Engineering, Dalian University of Technology, Dalian 116023, China"}]},{"given":"Limin","family":"Sun","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Information Security, Institute of Information Engineering, Chinese Academy of Sciences, Beijing 100093, China"}]},{"given":"Juanjuan","family":"Li","sequence":"additional","affiliation":[{"name":"School of Computer Science and Engineering, Dalian University of Technology, Dalian 116023, China"}]},{"given":"Jiangchuan","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Computer Science, Simon Fraser University, Vancouver, BC, Canada"}]}],"member":"179","published-online":{"date-parts":[[2013,3,17]]},"reference":[{"key":"B2-2013-358267","first-page":"955","author":"Qian J.","year":"2007","journal-title":"Network Communications and Security"},{"key":"B3-2013-358267","doi-asserted-by":"publisher","DOI":"10.1109\/WCNC.2004.1311528"},{"key":"B4-2013-358267","doi-asserted-by":"publisher","DOI":"10.1109\/MOBIQW.2006.361732"},{"key":"B5-2013-358267","doi-asserted-by":"publisher","DOI":"10.1109\/WCNC.2007.497"},{"first-page":"268","volume-title":"Proceedings of IEEE International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob \u20322005)","author":"Tang B.","key":"B6-2013-358267"},{"first-page":"163","volume-title":"Proceedings of the 6th IEEE Workshop on Mobile Computing Systems and Applications (WMCSA \u203204)","author":"Pucha H.","key":"B7-2013-358267"},{"key":"B8-2013-358267","doi-asserted-by":"publisher","DOI":"10.1145\/863955.863960"},{"first-page":"187","volume-title":"Proceedings of the 63rd IEEE Vehicular Technology Conference (VTC \u203206)","author":"Chuah M. 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