33 research outputs found

    Mobile Ad-Hoc Networks

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    Being infrastructure-less and without central administration control, wireless ad-hoc networking is playing a more and more important role in extending the coverage of traditional wireless infrastructure (cellular networks, wireless LAN, etc). This book includes state-of-the-art techniques and solutions for wireless ad-hoc networks. It focuses on the following topics in ad-hoc networks: quality-of-service and video communication, routing protocol and cross-layer design. A few interesting problems about security and delay-tolerant networks are also discussed. This book is targeted to provide network engineers and researchers with design guidelines for large scale wireless ad hoc networks

    Approximating optimal Broadcast in Wireless Mesh Networks with Machine Learning

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    With the growth of IoT, efficient broadcast is required for many applications. Yet, current protocols use primitive mechanisms based on heuristics. Multi-agent reinforcement learning is applied to approximate optimal broadcast in Wireless Mesh Networks. One of the proposed fully distributed algorithms, using Bayesian Neural Networks, outperforms MORE multicast and BATMAN, improving airtime up to 20%, e2e delay up to 30%, and satisfying timeout constraints in over the 97% of the cases

    Cooperative Data Backup for Mobile Devices

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    Les dispositifs informatiques mobiles tels que les ordinateurs portables, assistants personnels et tĂ©lĂ©phones portables sont de plus en plus utilisĂ©s. Cependant, bien qu'ils soient utilisĂ©s dans des contextes oĂč ils sont sujets Ă  des endommagements, Ă  la perte, voire au vol, peu de mĂ©canismes permettent d'Ă©viter la perte des donnĂ©es qui y sont stockĂ©es. Dans cette thĂšse, nous proposons un service de sauvegarde de donnĂ©es coopĂ©ratif pour rĂ©pondre Ă  ce problĂšme. Cette approche tire parti de communications spontanĂ©es entre de tels dispositifs, chaque dispositif stockant une partie des donnĂ©es des dispositifs rencontrĂ©s. Une Ă©tude analytique des gains de cette approche en termes de sĂ»retĂ© de fonctionnement est proposĂ©e. Nous Ă©tudions Ă©galement des mĂ©canismes de stockage rĂ©parti adaptĂ©s. Les problĂšmes de coopĂ©ration entre individus mutuellement suspicieux sont Ă©galement abordĂ©s. Enfin, nous dĂ©crivons notre mise en oeuvre du service de sauvegarde coopĂ©rative. ABSTRACT : Mobile devices such as laptops, PDAs and cell phones are increasingly relied on but are used in contexts that put them at risk of physical damage, loss or theft. However, few mechanisms are available to reduce the risk of losing the data stored on these devices. In this dissertation, we try to address this concern by designing a cooperative backup service for mobile devices. The service leverages encounters and spontaneous interactions among participating devices, such that each device stores data on behalf of other devices. We first provide an analytical evaluation of the dependability gains of the proposed service. Distributed storage mechanisms are explored and evaluated. Security concerns arising from thecooperation among mutually suspicious principals are identified, and core mechanisms are proposed to allow them to be addressed. Finally, we present our prototype implementation of the cooperative backup servic

    Actas da 10ÂȘ ConferĂȘncia sobre Redes de Computadores

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    Universidade do MinhoCCTCCentro AlgoritmiCisco SystemsIEEE Portugal Sectio
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