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Multi-hop broadcast communication is one of the main communication mechanisms to propagate safety and non-safety messages through vehicles in Vehicular Ad hoc Networks (VANETs). In our previous work, we proposed two broadcast schemes, fuzzy logic-based broadcast (FLB) and bandwidth-efficient fuzzy logic-assisted broadcast (BEFLAB). FLB offers high level of reachability where BEFLAB is more bandwidth...
The Smart cities are a relevant topic nowadays. It attracts most researchers and governmental authorities, due to the vision to adopt technology information and communication in this context, to facilitate access to urban services. Security stills a permanent challenge that affects most smart cities applications. Vehicular Ad Hoc Networks (VANets) is one of those applications, classified in the smart...
In recent years, the immense and ubiquitous coverage area of vehicular network is growing very frequently as the computational power and deployment of modern vehicle's wireless connectivity and their service facilities are raised. VANET (Vehicular Ad hoc Network) have become an orientation to the researchers and users both for inventive utilization of wide range of safety and non-safety applications...
In vehicular networks many applications and services require the use of vehicle position, which is typically obtained from off-the-shelf Global Positioning Systems (GPS). However, GPS' position accuracy is low and the GPS receiver relies on line-of-sight signalling from the satellites. For the sake of application consistency, when the GPS position is not received due to signalling failures, vehicular...
This paper introduces a new approach for infrastructure based content distribution in a vehicular network. It is built on broadcasting and pseudo random network coding. Its main strength is that, being broadcast based, it does not need any feedback channel and thus uses less data rate. Data is transmitted exploiting network coding, multiple linear combinations of data are sent. A vehicle needs to...
In Intelligent Transport System (ITS) there is a new kind of ad hoc network: Vehicular Ad-hoc Networks (VANET). In VANET, vehicles get useful information by communicating with each other or with a roadside unit. The location information is important in VANET. It is easy to obtain the locations of vehicle by GPS technology. However, there still are some unexpected problems such as not always being...
In this paper a novel Vehicular cooperative map matching method is presented. This map matching method uses the V2V communication in a VANET to exchange GPS information between vehicles. Then vehicles can apply the road constraints of other vehicles in their own map matching process and acquire a significant improvement in their positioning. The dependency of GPS measurements between different vehicles,...
Many Vehicular Ad Hoc Network (VANET) applications achieve a decent packet delivery ratio using mobility information in the beacon messages broadcasted to the single hop neighbours. Recently it has been found that if two VANET nodes are not within a line of sight (LoS), the performance of the employed VANET applications can be significantly degraded. Most of the existing VANET researches assume the...
This paper aims to increase downlink utilization by effectively scheduling roadside unit (RSU) to clustered Vehicular Ad-hoc Network (VANET) communications. It is assumed that each vehicle of the cluster has its own data to be downloaded from RSU which can be acquired by both RSU to vehicle (R2V) and RSU to vehicle to vehicle (R2V2V) communications. Proposed model converts resource sharing problem...
A method of approximating the Rician K-Factor with considerations of the local human-built environment is proposed for urban VANETs. The model is validated experimentally on a busy street in Australia, in the presence and absence of other vehicles. The model is found to accurately predict actual channel measurements in close-range communications scenarios.
Authentication is an essential framework for safe and secure communication of messages in VANETs. For authenticating messages the IEEE 1609.2 standard uses ECDSA as the standard digital signature algorithm. But the verification time for an ECDSA signature is very high. As a result an inside or an outside attacker could use a fraction of bandwidth and flood the network with invalid signatures resulting...
Vehicular Ad Hoc Network (VANET) is a Mobile Ad Hoc Network (MANET), and it can improve road safety and optimize road traffic. VANET has two forms: Vehicle to Vehicle (V2V) and Vehicle to Infrastructure (V2I) communication. The V2V communication can be used to transmit information about traffic conditions and / or vehicle accidents. This paper provides an applicative solution for V2V communication...
Workload modeling is one of the main methods for analysis the performance and capability of service provider systems. Widespread usage of workload modeling in computer networks has made it a critical necessity. Vehicular ad hoc Network (VANET) are computer networks established among the moving vehicles on a highway or street. Since these networks are still in the assessment phase and has not reached...
In this body of work, we are interested in road safety applications such as advanced driver assistance systems, based on Vehicular Ad hoc Networks (VANETs). One of the particular characteristics of this kind of networks is the continuous sharing of safety information by its nodes. Since this kind of information is time sensitive, a node cannot spend much time to verify its validity with an authority...
Vehicular Ad-hoc NETwork (VANET) simulation is crucial for the development of new protocols and applications. Even though real-world experimentation is the de facto benchmarking solution for any of these, the first evaluations must be made through simulation, due to the ease of changing parameters and scenarios. In this work, we propose a statistical channel model for VANET simulation based on the...
Vehicular ad hoc networks (VANET) have great potentials in modernizing transportation infrastructure. Deployment of data communications over such systems however is challenging due to node mobility. Unlike traditional networking scenarios, a user initiating a session for seeking traffic data (called receiver) is assumed to not know the identity associated with the counterpart. In reality, he or she...
Vehicular communication networks is a promising and emerging technology to facilitat road safety, Safety of life, traffic management, and infotainment dissemination for drivers and passengers. One of the ultimate goals in the design of such networking is to resist various malicious abuses and security attacks. In this research new security mechanisms are proposed to achieve secure certificate revocation,...
Enhancing road safety using vehicle-to-vehicle communication has become an important goal for the automotive industry. A lot of effort has been put in the design of an efficient medium access control protocol, capable to function correctly even under heavy congestion. The solutions proposed so far focus on data rate or transmission power control. In this paper, we argue that the most important parameter...
In Vehicular Ad Hoc Networks (VANET) broadcasting is the key means for dissemination of safety messages. Existing broadcasting schemes, however, result in broadcast storm problem. On the other hand, setting up maximum broadcast range is another critical issue for successful communication. Based on the neighbor vehicle density, we intend to mitigate the broadcast storm problem. We also try to reduce...
Security plays an important role in the system design with the development of VANETs. Because of the unreliable communications in VANETs, security protocols need more considerations, such as privacy, authentication, and consistency of messages. However, efficiency has been overlooked before, because previous methods incur significant communication overhead. In this paper, we propose a novel security...
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