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The Feasibility of a Search Engine for Metropolitan Vehicular Ad-Hoc Networks

Author(s): Christian Wewetzer, Murat Caliskan, Andreas Luebke, Martin Mauve.
Title: The Feasibility of a Search Engine for Metropolitan Vehicular Ad-Hoc Networks
Published: AutoNet 2007: Proceedings of the 2nd IEEE Workshop on Automotive Networking and Application, Washington, DC, USA, November 2007
Abstract: Applications based on vehicular ad-hoc networks(VANETs) rely on information exchanged within the network.There are two different methods of exchanging informationamong vehicles, i.e. distributing it proactively or requesting iton-demand. Proactive distribution of information is suitable fordistributing small amounts of data, comprising information ofcommon interest for a large number of vehicles. In contrast,proactive distribution of data is not advisable if informationcontained therein is relevant only to a small number of vehiclesor if it would require large amounts of data. A more efficientalternative in this case is on-demand information distribution,which allows information of interest to be located, requestedand sent on-demand. On-demand information retrieval in sparsemetropolitan-wide VANETs is challenging, as vehicles stay in themetropolitan area only for a short period of time and messageexchange is impacted by communication delays. In this paper,we introduce three different concepts of a search engine formetropolitan VANETs and explain how these concepts couldmake it possible to allow on-demand information exchange. Wecompare the concepts for their applicability by evaluating theirperformance with respect to latency and network load.
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