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    Item type:Publication, Access status: with files ,
    My smartphone tattles: considering popularity of messages in opportunistic data dissemination
    (Multidisciplinary Digital Publishing Institute (MDPI), 2019-01-29)
    Udugama, Asanga
    ;
    Dede, Jens
    ;
    Förster, Anna
    ;
    Kuppusamy, Vishnupriya
    ;
    Kuladinithi, Koojana
    Opportunistic networks have recently seen increasing interest in the networking community. They can serve a range of application scenarios, most of them being destination-less, i.e., without a-priori knowledge of who is the final destination of a message. In this paper, we explore the usage of data popularity for improving the efficiency of data forwarding in opportunistic networks. Whether a message will become popular or not is not known before disseminating it to users. Thus, popularity needs to be estimated in a distributed manner considering a local context. We propose KEETCHI, a data forwarding protocol based on Q-Learning to give more preference to popular data rather than less popular data. Our extensive simulation comparison between KEETCHI and the well known EPIDEMIC protocol shows that the network overhead of data forwarding can be significantly reduced while keeping the delivery rate the same.
    Publicationtype: Journal Article
    Scopus© Citations 9  617  507
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    Item type:Publication, Access status: without files ,
    Simulating Opportunistic Networks: Survey and Future Directions
    (2018)
    Dede, Jens
    ;
    Förster, Anna
    ;
    Hernández-Orallo, Enrique
    ;
    Herrera-Tapia, Jorge
    ;
    Kuladinithi, Koojana
    Simulation is one of the most powerful tools we have for evaluating the performance of Opportunistic Networks. In this survey, we focus on available tools and models, compare their performance and precision and experimentally show the scalability of different simulators. We also perform a gap analysis of state-of-the-art Opportunistic Network simulations and sketch out possible further development and lines of research. This survey is targeted at students starting work and research in this area while also serving as a valuable source of information for experienced researchers.
    Publicationtype: Journal Article
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