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Agon Memedi, "Centralized Cluster Coordination in Heterogeneous Vehicular Networks," Master's Thesis, Department of Computer Science, University of Paderborn, August 2015. (Advisors: Falko Dressler and Christoph Sommer)


Intelligent Transport Systems (ITS) have emerged as the main solution to handle the ever increasing traffic on roads. Those applications assume scenarios where Inter-Vehicle Communication (IVC) is enabled, hence vehicles can communicate with each other. However, existing communication technologies, be it ad-hoc or infrastructure-based, have shortcomings and can not satisfy the requirements of every scenario. Yet, each of those technologies has its advantages which can compensate for the shortcomings of the other, if combined. Motivated by this, the idea of heterogeneous vehicular networks arises where different types of communication technologies are put together so they complement each other. The advantages of one technology are used to overcome the shortcomings of the other. In this thesis I built upon LTE4V2X, a centralized clustering approach, which assumes a heterogeneous vehicular network and tries to distribute the network load between Dedicated Short Range Communications (DSRC) and Long Term Evolution (LTE) by forming clusters. I implemented LTE4V2X in the Veins simulation environment and studied its parameters in various scenarios. To measure application’s performance I defined the FCD Loss metric, which returns the fraction of nodes not receiving Floating Car Data (FCD) messages in the scenario. Results show that LTE4V2X is able to cope with high node densities, given that its parameters are tuned in favor of a stable LTE uplink connection. Furthermore, I extended LTE4V2X to feature adaptive transmit power control. The outcome represents a novel approach where a central entity adapts the DSRC transmission power of the nodes, based on the span of the cluster they belong to. By adjusting the transmission power dynamically, in the best case, we achieved up to 50\% less channel load while sacrificing only 1\% of the application performance characterized by the FCD Loss.

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Agon Memedi

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    author = {Memedi, Agon},
    advisor = {Dressler, Falko and Sommer, Christoph},
    title = {{Centralized Cluster Coordination in Heterogeneous Vehicular Networks}},
    institution = {Department of Computer Science},
    year = {2015},
    month = {August},
    school = {University of Paderborn},
    type = {Master's Thesis},

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