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Bundles fragmentation in vehicular delay-tolerant networks Magaia, N Pereira, P. R. Casaca, A. Rodrigues, J.J.P.C. Dias, J. A. Isento, J. N. Cervelló Pastor, Cristina Gallego Ezpeleta, J. Universitat Politècnica de Catalunya. Departament d'Enginyeria Telemàtica Universitat Politècnica de Catalunya. BAMPLA - Disseny i Avaluació de Xarxes i Serveis de Banda Ampla Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telemàtica i xarxes d'ordinadors Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telemàtica i xarxes d'ordinadors::Protocols de comunicació Vehicular ad hoc networks (Computer networks) Computer networks -- Reliability Comunicació sense fil, Sistemes de Protocols de xarxes d'ordinadors Vehicular Delay-Tolerant Networks use the delaytolerant architecture and protocols to overcome the disruptions in network connectivity. These concepts help in cases where the network is sparse or with large variations in density or there is no end-to-end connectivity, by providing a communications solution for non real-time applications. This paper presents data fragmentation techniques to optimize the efficiency of data delivery for the case of the short node contacts that characterize vehicle networks. The techniques were tested in a laboratory environment with portable digital assistants and Lego Mindstorm NXT robotic cars. If no fragmentation is used, only small messages are successfully transferred. Proactive fragmentation fragments messages to a predefined size in the source node. Reactive fragmentation adjusts the fragment sizes to the real duration of the contact when it is broken. Reactive fragmentation showed a good efficiency in adapting the fragmentation in real time to the contact duration. Proactive fragmentation can perform slightly better if the fragment sizes are carefully chosen as it requires less processing. As this choice is difficult, reactive fragmentation is more practical to use. Postprint (published version) 2012 Conference report Magaia, N. [et al.]. Bundles fragmentation in vehicular delay-tolerant networks. A: Conference on Next Generation Internet Design and Engineering. "2011 7th EURO-NGI conference on next generation internet networks NGI, 2011 June 27, 2011 June 29, Kaiserslautern, Germany: proceedings". Kaiserslautern: IEEE, 2012, p. 1-6. 978-1-4577-0917-3 https://hdl.handle.net/2117/15168 10.1109/NGI.2011.5985945 eng http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5985945 http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Restricted access - publisher's policy Attribution-NonCommercial-NoDerivs 3.0 Spain 6 p. application/pdf IEEE