Opportunistic Networking in Delay Tolerant Vehicular Ad Hoc Networks

2010 ◽  
pp. 282-300 ◽  
Author(s):  
Ashish Agarwal ◽  
Thomas D.C. Little
Keyword(s):  
Short Range ◽  
Vehicular Ad Hoc Networks ◽  
Safety Information ◽  
Collision Warning ◽  
Intermittent Connectivity ◽  
Real Time Traffic ◽  
Moving Vehicles ◽  
And Performance ◽  
Hoc Networks ◽  
Safety Features

Vehicular Area Networking (VANET) is an emerging technology to support a class of applications involving communications between vehicles, and vehicles and the environment. Activity in this area includes development of the Dedicated Short Range Communication (DSRC) protocol aimed at enabling vehicles to exchange safety information to enhance awareness of the vehicle beyond the line of sight, and to enhance safety features such as active braking and collision warning. While safety is the primary driver for development, additional applications emerge as potential users of this technology that are more general in nature. Real-time traffic and route updates, traffic monitoring, remote diagnostics, general purpose Internet access and in-car entertainment are examples that require data collection and dissemination analogous to the wired Internet. However, DSRC and related short-range communications technology would appear to be insufficient for these scenarios. In this chapter, we describe, how and under what conditions it is feasible, and in fact desirable, to use short range communications. We describe a network formed over moving vehicles implemented by short-range communication and thereby analyze factors that affect the design and performance. Observations reveal intermittent connectivity between vehicles traveling on the roadway in opposite directions that hinders applications. Techniques adapted from related research in computer networks provide solutions for enabling networking in a fragmented network of moving vehicles. We elaborate and demonstrate analytically the application of techniques that enable networking through short-range communication.

scholarly journals An improved supervisory protocol for automatic selection of routing protocols in environment-aware vehicular ad hoc networks

2018 ◽  
Vol 14 (11) ◽  
pp. 155014771881505 ◽  
Author(s):  
Ishtiaq Wahid ◽  
Ata Ul Aziz Ikram ◽  
Masood Ahmad ◽  
Fasee Ullah
Keyword(s):  
Routing Protocols ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Performance Metrics ◽  
Mobility Model ◽  
Operational Environment ◽  
Trade Offs ◽  
Microscopic Features ◽  
And Performance ◽  
Hoc Networks

With resource constraint’s distributed architecture and dynamic topology, network issues such as congestion, latency, power awareness, mobility, and other quality of service issues need to be addressed by optimizing the routing protocols. As a result, a number of routing protocols have been proposed. Routing protocols have trade-offs in performance parameters and their performance varies with the underlying mobility model. For designing an improved vehicular ad hoc network, three components of the network are to be focused: routing protocols, mobility models, and performance metrics. This article describes the relationship of these components, trade-offs in performance, and proposes a supervisory protocol, which monitors the scenario and detects the realistic mobility model through analysis of the microscopic features of the mobility model. An analytical model is used to determine the best protocol for a particular mobility model. The supervisory protocol then selects the best routing protocol for the mobility model of the current operational environment. For this, EstiNet 8.1 Simulator is used to validate the proposed scheme and compare its performance with existing schemes. Simulation results of the proposed scheme show the consistency in the performance of network throughout its operation.

ECAS: an efficient and conditional privacy preserving collision warning system in fog-based vehicular ad hoc networks

2020 ◽  
Vol 3 (3-4) ◽  
pp. 205-217
Author(s):  
Zhiguang Qin ◽  
Yuedi Li ◽  
Xin Ye ◽  
Jin Zhou ◽  
Minsheng Cao ◽  
...  
Keyword(s):  
Ad Hoc Networks ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Warning System ◽  
Privacy Preserving ◽  
Collision Warning ◽  
Hoc Networks

Efficient Mechanisms and Performance Analysis of Routing Protocols in VANETs for Realistic Scenarios

2016 ◽  
Vol 8 (3) ◽  
pp. 20-49 ◽  
Author(s):  
Christos Bouras ◽  
Vaggelis Kapoulas ◽  
Enea Tsanai
Keyword(s):  
Ad Hoc Networks ◽  
Routing Protocols ◽  
High Speed ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Traffic Efficiency ◽  
Pattern Movement ◽  
Manet Routing ◽  
And Performance ◽  
Hoc Networks

Vehicular Ad Hoc Networks (VANETs) are considered as a special case of mobile Ad Hoc Networks (MANETs) and are recently gaining a great attention from the research community. The need for improved road safety, traffic efficiency and direct communication along with the great complexity in routing, makes VANETs a highly challenging field. Routing in VANETs has to adapt to special characteristics such as high speed and road pattern movement as well as high linkage break probability. In this work, the authors show that traditional MANET routing protocols cannot efficiently handle the challenges in a VANET environment and thus need further modifications. For this reason, they propose and implement an enhancement mechanism, applied to the GPSR routing protocol that adapts to the needs of a VANET. The proposed mechanism's performance is evaluated through simulation sets for urban and highway scenarios and compared to the performance of the most common MANET routing protocols adopted in VANETs. The proposed enhancement is shown to be considerably beneficial and it significantly outperforms the rest of the tested routing protocols for almost every topology setting.

Multi-Scenarios Vehicle Traces Modeling in Co-Simulation of Vehicular Ad-Hoc Networks

2012 ◽  
Vol 178-181 ◽  
pp. 2694-2698
Author(s):  
Jiang Feng Wang ◽  
Shuo Nie ◽  
Xue Dong Yan ◽  
Wang Xiang
Keyword(s):  
Wireless Communication ◽  
Ad Hoc Networks ◽  
Short Range ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Modeling Tools ◽  
Average Speed ◽  
The Difference ◽  
Hoc Networks

Vehicular ad hoc networks (VANETs) form when vehicles are equipped with devices capable of short-range wireless communication. Realistic vehicle trace modeling for VANETs simulations is a challenging task, which requires the reliable characterization of vehicular mobility. In this study, three different vehicle scenarios are proposed to analyze the difference between vehicle traces in multi-scenarios: city road, expressway and highway. Common trace modeling tools and characters of the scenarios are explored. Furthermore, three experimental scenarios are established using VanetMobiSim to produce vehicle traces. The experimental results show that the trend of the average speed versus the number of vehicles is different, and the vehicular density distribution demonstrates the realism of vehicle trace under multi-scenarios.

scholarly journals Modeling Elliptical Curve Cryptography Keys using Back Propagation Algorithm

2019 ◽  
Vol 8 (9S3) ◽  
pp. 1525-1529
Keyword(s):  
Ad Hoc Networks ◽  
Secure Communication ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Back Propagation ◽  
Back Propagation Algorithm ◽  
Public And Private ◽  
Moving Vehicles ◽  
Identity Based ◽  
Hoc Networks

Vehicular Ad Hoc Networks (VANETs) are the newest for of Ad Hoc Networks in which moving vehicles act as routers and nodes to form a network. VANETs use many cryptographic approaches like symmetric key approaches, public key approaches, certificate revocation, pseudonym based approaches, identity-based cryptography, identity-based signature, Elliptical Curve Cryptography (ECC) etc. for secure communication. These techniques use public and private keys for enhancing the security of messages and all these keys are stored on hardware devices like TPDs (Temper Proof Devices) in VANETs. TPDs are protected by the cryptographic algorithms. In this present era of technology these algorithms and their online simulators are freely available on internet and can be easily intruded. There is a potential need to enhance the security of these keys. In this paper we worked on enhancing the security of ECC keys stored in TPDs of VANETs using a specific network of Artificial Neural Networks.

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