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In hybrid vehicular ad hoc networks (VANETs), content data can be downloaded either from 3G/4G cellular networks or from roadside units (RSUs) of VANETs. When downloading via cellular networks, the delay is low but the cost is expensive. While, downloading via VANETs, the cost is nearly free. However, due to the unique characteristics of VANETs, such as frequent disruptions, high speed mobility and...
We aim through this work to investigate the optimal deployment of roadside units, the stationary component in the vehicular network, in order to improve the performance, the reliability and the connectivity of the network. RSUs have a critical role in safety applications but also in infotainment applications. Hence, spreading RSUs should pay attention to cover with its best effort the dark zones and...
Vehicular Ad-hoc Network, VANET, offers new opportunities for better road traffic management. Using vehicle to vehicle (V2V) and vehicle to infrastructure (V2I) communications, several research works were published on road traffic improvement in general and at road intersection in particular. One of the challenging problems is to minimize vehicles' waiting time at the intersection as well optimize...
Time-sensitive mobile service with vehicular networks depend on continuous coverage on the road system. It is a challenge to meet a tight budget while maintaining coverage quality. In order to resolve the problem, we model the road system as an undirected graph and reduce it to a Knapsack Constrained Steiner Tree model. Since the reduced model is an NP-hard problem, we resolve it by using Lagrangian...
Two types of safety messages, beacons and event-driven emergency warning messages, are playing a key role in many safety-related applications of Intelligent Transportation System (ITS), which are designed for improving road safety and traffic efficiency. Every vehicle on the road periodically sends safety beacons to notify the neighbors on the road its position, speed, direction and acceleration....
Thanks to the advances in wireless technologies, mobile vehicular networks are likely to become the most relevant form of mobile ad hoc networks (MANET). Vehicular communication which facilitates the exchange of information between vehicles is the prerequisite not only for extending the access to Internet while on the road, but also to cater for special applications such as of road traffic and travel...
In an Intelligent Transport System (ITS), data dissemination based on inter-vehicle communication is effective for acquiring real-time traffic jams information. In this paper, we propose a novel method for traffic jams information dissemination in vehicular ad-hoc networks. In our proposed method, vehicles already trapped in a traffic jams elect leaders according to their locations from upstream and...
Today's vehicles have the capability of sensing, computing, and communicating capabilities. Different components in the vehicle constantly exchange the available information with other vehicles on the road and cooperate for the purpose of ensuring safety and comfort, known as vehicular ad hoc network (VANET). VANETs are a specific type of mobile ad hoc networks (MANETs) that are currently attracting...
We consider that a given number of dissemination points (DPs) have to be deployed for disseminating information to vehicles travelling in an urban area. We formulate our problem as a maximum coverage problem (MCP) so as to maximize the number of vehicles that get in contact with the DPs and as a second step with a sufficient amount of time. Since the MCP is NP-hard, we solve it though heuristic algorithms...
In this paper a new clustering algorithm for vehicular ad-hoc networks (VANET) is presented. The proposed solution is a modification of the Basagnipsilas distributed and mobility-adaptive clustering (DMAC) algorithm. Some additional conditions that have to be fulfilled before the cluster head change, are introduced to better suit the road traffic. Tests performed in the simulation environment consisting...
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