Computer Simulations of VANETs Using Realistic City Topologies

Proceedings of the 16th ACM International Conference on Modeling, Analysis &Amp; Simulation of Wireless and Mobile Systems

et al. 2013

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In Vehicular ad hoc Networks (VANETs), efficient dissemination of messages is a key factor to speed up the development of useful services and applications. In this paper, we propose a novel algorithm that automatically chooses the best dissemination scheme trying to fit the warning message delivery policy to the current characteristics of each specific vehicular scenario. Our mechanism uses as input parameters the vehicular density and the topological characteristics of the environment where the vehicles are located, in order to decide which dissemination scheme to use. Simulation results demonstrate the feasibility of our approach, which is able to support more efficient warning message dissemination in vehicular environments.

Section: Simulation Environmentmentioning

confidence: 99%

On the selection of optimal broadcast schemes in VANETs

Sanguesa

Proceedings of the 16th ACM International Conference on Modeling, Analysis &Amp; Simulation of Wireless and Mobile Systems

et al. 2013

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“…The simulator was also modified to make use of our Real Attenuation and Visibility (RAV) scheme (Martinez et al, 2013), which proved to increase the level of realism in VANET simulations using real urban roadmaps in the presence of obstacles. The RAV propagation model is presented in detail in Section 2.1.…”

Section: Simulation Environment and Previous Conceptsmentioning

confidence: 99%

“…It uses a probability density function to determine the probability of a packet being successfully received at any given distance. With respect to other attenuation schemes, such as Two-Ray Ground and Nakagami, our scheme, instead of being theoretical, is obtained directly from experimental data (Martinez et al, 2013).…”

Section: Real Attenuation and Visibility Model For Real Roadmap Scenamentioning

confidence: 99%

RTAD: A real-time adaptive dissemination system for VANETs

Sanguesa

Computer Communications

et al. 2015

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Efficient message dissemination is of utmost importance to propel the development of useful services and applications in Vehicular ad hoc Networks (VANETs).In this paper, we propose a novel adaptive system that allows each vehicle to automatically adopt the optimal dissemination scheme in order to fit the warning message delivery policy to each specific situation. Our mechanism uses as input parameters the vehicular density and the topological characteristics of the environment where the vehicles are located, in order to decide which dissemination scheme to use. We compare our proposal with respect to two static dissemination schemes (eMDR and NJL), and three adaptive dissemination systems (UV-CAST, FDPD, and DV-CAST). Simulation results demonstrate that our approach significantly improves upon these solutions, being able to support more efficient warning message dissemination in all situations ranging from low densities with complex maps, to high densities in simple scenarios. In particular, RTAD improves existing approaches in terms of percentage of vehicles informed, while significantly reducing the number of messages sent, thus mitigating broadcast storms.

“…At the MAC layer, channel access priorities were implemented: four different Access Categories (ACs) provide different priority to application messages, where AC0 has the lowest and AC3 the highest priority. The simulator was also modified to make use of our Real Attenuation and Visibility (RAV) propagation model [17], which increases the level of realism of the VANET simulations by accounting for real urban roadmaps and obstacles that have a strong influence over the wireless signal propagation.…”

Section: Simulation Environmentmentioning

confidence: 99%

On the use of a Cooperative Neighbor Position Verification scheme to secure warning message dissemination in VANETs

Martínez

38th Annual IEEE Conference on Local Computer Networks

et al. 2013

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Abstract-Efficient schemes for warning message dissemination in vehicular ad hoc networks (VANETs) use context information collected by vehicles about their neighbor nodes to guide the dissemination process. Based on this information, vehicles autonomously decide whether or not they are the most appropriate forwarding nodes. These schemes maximize their performance when all the vehicles advertise correct information about their positions. Position errors introduced by nodes attacking the system, and other common errors due to malfunction of the localization systems, may drastically reduce the performance of the dissemination process. We present a proactive Cooperative Neighbor Position and Verification (CNPV) protocol that detects nodes advertising false locations and selects optimal forwarders so as to mitigate the impact of adversarial users. We combine our mechanism with two warning dissemination schemes for VANETs, and demonstrate how these algorithms can benefit from the use of our security scheme in the presence of malicious nodes trying to exploit the inherent vulnerabilities of each algorithm.