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ABSTRACT: Vehicular Ad hoc Networks appeared as a natural result of the evolution of the communication technology, which becomes able to satisfy the need of users to be connected anytime and anywhere. Providing comfort services such as Internet access or even vehicle traffic monitoring requires the use of road-side units (RSU) as gateways to the requested resources. Today, most of Intelligent Transport Systems (ITS) architectures rely on the integration and use of such gateways. Nevertheless, none of them tried to study the way these should be deployed neither the way they should be organized to achieve best performances. We think that such a study is primordial, in an environment that cannot be fully covered due to the high costs of infrastructure deployment. In this paper we provide a deep analysis of the deployment problem. We show in a first part the benefits of using RSU as support for V2V communications. We then investigate in a second part different approaches and strategies for Access-Points deployment. An objectives-based analysis reveals the role of centrality and equidistant-based deployment in optimizing the end-to-end delay and ensuring a regular and stable service access. Our simulation results confirm that the performances in a cooperative environment (V2I and V2V) get greatly improved. It shows that the use of RSU becomes essential in low density situations and especially in case of long-distance communications. In the context of RSU deployment, simulation results proved that centrality and equidistance are key factors for optimizing end-to-end delays and ensuring stable performances.
Telecommunications (ICT), 2010 IEEE 17th International Conference on; 05/2010
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ABSTRACT: Mobile ad hoc networks such as Mesh networks or Vehicular ad hoc networks (VANETs) are in most cases relying on infrastructure deployment to provide access to internet services or any kind of shared resources. Developing dedicated deployment strategies becomes hence essential. In fact, research proved that the backbone topology has noticeable impact on the network performance. The main contribution of this paper is a thorough study of the impact of roadside units (RSUs) deployment strategies in vehicular ad hoc networks on the performances. We point out in a first part the main characteristics of such an environment and extract the most significant deployment criteria. We show in a second part that centrality is the key point for achieving best performances. Our analysis reveals that group-based deployment strategies could even provide a certain quality of service while communicating through RSUs. Simulation results clearly illustrate a general improvement of performances in terms of end-to-end delay while adopting a group -centrality based deployment approach.
New Technologies, Mobility and Security (NTMS), 2009 3rd International Conference on; 01/2010
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ABSTRACT: Communication and content sharing between cars has become one of the most interesting services for mobile users. Nevertheless, most efforts in this research field still is focused on direct opportunistic meetings between cars, which may result in poor performance. In this paper, we present a global architecture for vehicular ad hoc networks (VANET) that overcomes the intermittent nature of connectivity on VANETs and provides a consistent global peer-to-peer sharing service among participating vehicles. We propose a traffic aware organization of access points. Besides enabling the connection of distant vehicles and though extending the file-sharing environment, we study through simulation, the influence of incorporating vehicles traffic in the organization of access points on the performance of the sharing service.
Mobile Ubiquitous Computing, Systems, Services and Technologies, 2008. UBICOMM '08. The Second International Conference on; 11/2008
