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Intelligent Transportation Systems (ITS), supporting the development of innovative vehicular applications, have benefited from major contributions in the field of wireless networking. Broadcasting is a crucial communication type for many domain-specific applications. In this work we focus on analytical modeling of multi-hop broadcast in vehicular networks and quantify its performance in terms of relevant...
The data delivery in Vehicular Ad Hoc Networks (VANETs) depends on the mobility of the vehicles (e.g. with carry-and-forward). However, the mobility of the vehicles is not only affected by the nodes themselves, but also by some external means such as the traffic lights. The red light stops the vehicles at the intersection, which will increase the delivery delay of the messages carried by the vehicle...
Motivated by studies of wireless ad hoc networks in obstructed environments, in this work we focus on the problem of establishing connectivity at an intersection of two roads, or streets, surrounded by obstacles. An instance of the problem is defined by four street segments meeting at an intersection point, a street width, a node density at each street segment and a transmission range of the communication...
We investigate here the following fundamental question — how can we achieve a high reachability while minimizing the inherent effects of high transmission power for a beamforming-based broadcast scheme in multihop wireless networks? To address this challenge, this paper proposes a fully distributed scheme that allows nodes to set dynamically their transmission range based on their local densities...
Nowadays, Vehicular Ad hoc NETworks (VANETs) attract more and more attentions both from academia and industry. Although it has achieved much success in the research field, large-scale deployments of VANETs are still lacking. One barrier facing us is that both governments and companies are doubtful about the performance of VANETs in large-scale deployment in real world. The connectivity of VANETs is...
As deploying Vehicular Ad Hoc NETworks (VANETs) costs large amounts of resources, it is crucial that governments and companies make a thorough estimation and comparison of the benefits and the costs. The network connectivity is an important factor we should take care of, because it can greatly affect the performance of VANETs and further affect how much we can benefit from VANETs. We use percolation...
This paper investigates the performance of Multihop connectivity for inter-vehicle communication (IVC) systems in Vehicular Ad Hoc NETwork (VANET). The hop path between two or more vehicles is dedicated when a broadcast signaling for initiation connectivity is successfully guaranteed. In addition, the performance of vehicular connectivity is not only based on maximum transmission range, but also based...
IEEE 802.11p provides a communication standard for Wireless Access in Vehicular Environment (WAVE), including both safety and non-safety communications. Safety-related communications can be from either event-driven or periodic-driven requests. The event-driven messages usually convey emergency information and, hence, are more critical than periodic-driven messages. IEEE 1609.3 specifies the operations...
This study presents the importance of propagation models in car-to-car simulations. It shows both their behaviour when using different propagation models and the possibility to auto adapt a propagation model in a simulation depending on the zone (urban, highway...). Also, it shows how diverse models can be reduced to one, optimizing the network performing in the simulation.
Focusing on large-scale vehicular ad-hoc networks (VANETs), we consider the interplay between single-hop channel models and large-scale network connectivity. Building on a realistic urban traffic simulator, we progressively increase the sophistication of the wireless link while evaluating the resulting connectivity profiles. Our results show that large-scale VANET connectivity, whose understanding...
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