405 research outputs found

    The Dynamics of Vehicular Networks in Urban Environments

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    Vehicular Ad hoc NETworks (VANETs) have emerged as a platform to support intelligent inter-vehicle communication and improve traffic safety and performance. The road-constrained, high mobility of vehicles, their unbounded power source, and the emergence of roadside wireless infrastructures make VANETs a challenging research topic. A key to the development of protocols for inter-vehicle communication and services lies in the knowledge of the topological characteristics of the VANET communication graph. This paper explores the dynamics of VANETs in urban environments and investigates the impact of these findings in the design of VANET routing protocols. Using both real and realistic mobility traces, we study the networking shape of VANETs under different transmission and market penetration ranges. Given that a number of RSUs have to be deployed for disseminating information to vehicles in an urban area, we also study their impact on vehicular connectivity. Through extensive simulations we investigate the performance of VANET routing protocols by exploiting the knowledge of VANET graphs analysis.Comment: Revised our testbed with even more realistic mobility traces. Used the location of real Wi-Fi hotspots to simulate RSUs in our study. Used a larger, real mobility trace set, from taxis in Shanghai. Examine the implications of our findings in the design of VANET routing protocols by implementing in ns-3 two routing protocols (GPCR & VADD). Updated the bibliography section with new research work

    Improving quality of service through road side back-bone network in VANET

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    The vehicular ad hoc Networks (VANETs) are expected to support a large spectrum of traffic alert, dynamic route planning, file sharing, safety and infotainment applications to improve traffic management. User satisfaction plus in time delivery of real-time messages is the most significant quality evaluation criterion for vehicular applications. High mobility and rapidly changing topologies always lead to intermittent quality of services, higher delay and packet dropping issues in network. To improve the quality of services for multi-hop and dynamic environment, different types of solutions have been proposed. The article introduces multi-protocol label switching based on roadside backbone network to provide widespread, scalable, high-speed, robust quality of services and improve network efficiency. The simulation results showed that proposed model improves data transmission and routing performance in terms of data delivery, throughput, end-to-end delay and achieve adequate utilization of resources

    Performance evaluation of vehicular networks in urban environments

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    With the development of all kinds of science and technology nowadays, people are paying more attention to the various aspects of smart cities, especially vehicular networks. Based on the increase in traffic demand, people's dependence on vehicles is also growing gradually, which leads to an intelligent social transportation system being crucial. However, inevitably, there will always be some unexpected car accidents in the urban traffic environment. In this paper, we would mainly focus on the performance evaluation of vehicular networks with a car accident in the urban centre of Barcelona. And we will start from different angles for a multi-dimensional analysis of the impact of different vehicles and environmental factors on urban traffic. In this project, the performance of the vehicular network in the Eixample district would be evaluated from the following four perspectives:1. The configuration of the vehicles 2. The nominal road speed around accident 3. The transmission range 4. The rebroadcasting scheme of the accident message. Through the data analysis of the packet delay, the percentage of warned vehicles, and the warning distance respectively, to explore the impact of diverse factors on the vehicle network and find a better scheme to improve the intelligent transportation system (ITS) in the urban environment
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