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These communication technologies assume variable delays and bandwidth constraints characterized by a non-transmission control protocol\/internet protocol architecture but interacting with it at the edge of the network. VDTNs are based on the principle of asynchronous communications, bundle-oriented communication from the DTN architecture, employing a store-carry-and-forward routing paradigm. In this sense, VDTNs should use the tight network resources optimizing each opportunistic contact among nodes. Given the limited contact times among nodes, fragmentation appears as a possible solution to improve the overall network performance, increasing the bundle delivery probability. This article proposes the use of several fragmentation approaches (proactive, source, reactive, and toilet paper) for VDTNs. They are discussed and evaluated through a laboratory testbed. Reactive and toilet paper approaches present the best results. It was also shown that only the source fragmentation approach presents worst results when compared with non-fragmentation approaches.<\/jats:p>","DOI":"10.1186\/1687-1499-2011-195","type":"journal-article","created":{"date-parts":[[2011,12,6]],"date-time":"2011-12-06T19:16:06Z","timestamp":1323198966000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Performance assessment of fragmentation mechanisms for vehicular delay-tolerant networks"],"prefix":"10.1186","volume":"2011","author":[{"given":"Jo\u00e3o A. F. F.","family":"Dias","sequence":"first","affiliation":[]},{"given":"Joel J. P. C.","family":"Rodrigues","sequence":"additional","affiliation":[]},{"given":"Jo\u00e3o N.","family":"Isento","sequence":"additional","affiliation":[]},{"given":"Paulo R. B. 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