Dipl.-Inf.

Roscher, Karsten

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Now showing 1 - 3 of 3
  • Publication
    On the feasibility of multi-hop communication in a realistic city scenario
    ( 2017)
    Roscher, Karsten
    Vehicular ad hoc networks (VANETs) are about to enter the market in the upcoming years. While direct message exchange is limited to a few hundred meters and mostly line-of sight, multi-hop forwarding can significantly extend the communication range. In this paper, the influence of network density and vehicle distribution on multi-hop communication in VANETs is investigated using a model of the city of Luxembourg. Introducing an idealistic reference routing we identify the need for high penetration rates to achieve acceptable reliability independent of the selected routing protocol. A comparison with Greedy forwarding shows its weaknesses to select proper next hop candidates when the number of equipped vehicles increases.
  • Publication
    Protocol modeling accuracy in VANET simulators
    ( 2017)
    Bittl, Sebastian
    ;
    Roscher, Karsten
    Vehicular ad hoc networks are about to enter the mass market in upcoming years. High effort for real world field tests leads to high dependency of development and evaluation of such networks on simulations. We compare supported features of common simulation frameworks with current standards and study the performance impact of incomplete standard conformance. We find that a lack of support for data encoding schemes and security functionality may massively affect simulation results. Our findings apply to many well-known simulation frameworks. Proposals to overcome identified weaknesses are provided.
  • Publication
    Forwarding in VANETs: GeoNetworking
    ( 2015)
    Tomatis, Andrea
    ;
    Menouar, Hamid
    ;
    Roscher, Karsten
    Nowadays connectivity in the vehicles is becoming the base to enable safety, traffic efficiency, and infotainment applications. These applications require to exchange information with specific geographical locations. After a decade of research and standardization activities, a dedicated technology to support forwarding in Vehicular Ad-hoc Network (VANET) called GeoNetworking has been completed in Europe. This chapter will provide an overview of GeoNetworking features and functionalities describing geographical addressing and geographical forwarding in an easy and understandable way for both technical and non-technical readers.