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Driving means frequently changing location. This, is in turn, means a regular need for information on the current location and specifically for data on the surrounding traffic And there is necessitate of Technique for handling the network connection during the multi-hop data exchange between road side unit and vehicle(V2I) and between vehicles (V2V). Although need for information relate to the close...
The aim of this work is to study TDMA in intelligent transportation systems (ITS) based on the IEEE 802.11 standard, with the aim of increasing the number of subscribers served by roadside stations by establishing a fixed-size slots and guard interval. The resulting TDMA sublayer is based on the existing MAC layer standard 802.11a. The simulation is made on network simulator NS-3.
Vehicular Ad Hoc Networks (VANET) is a variant of Mobile Ad Hoc Networks (MANET) in which communication nodes are mainly vehicles. VANETs are heterogeneous networks which provide wireless communication among vehicles and vehicle to Road Side Units (RSU). Now-a-days, it has become an interesting area of research as it is intended to improve Intelligent Transport System (ITS). To exploit effective communication...
Reliability and timely information delivery are highly concerned factors in Vehicular ad-hoc network. A better handover mechanism plays an important role in the handover process between the vehicle nodes during the vehicles on the road. Vertical handover is very much essential to ensure service continuity in Vehicular Ad-hoc network. When we compared with conventional handover decision taken by single...
This paper considers the fair access problem in vehicular ad hoc networks (VANETs) and develops an analytical model for analyzing the performance of an IEEE 802.11 DCF based fair channel access protocol in a non-saturated state. We derive the relationship between the transmission probability and the minimum contention window size of a vehicle, and the relationship between the velocity and the minimum...
Vehicular Ad-hoc Networks (VANET) is mainly discussed todeploy of ITS (Intelligent Transportation Systems) analysis and design solutions for safety, security and road traffic monitoring with better management. Through the vehicle information exchange to vehicles, road side units (RSU) and infrastructure nodes, Traffic Monitoring Center (TMC) can support incident detection monitoring and management...
Offloading a part of cellular traffic through other kinds of networks, such as Wi-Fi hotspots and femtoCells represents an interesting solution for operators to cope with the high user traffic demand increase. In this paper, we propose to use the Vehicular ad hoc Networks (VANETs) for the same purpose. We present an analytical study based on an optimization problem formulation to evaluate the potential...
A method for real-time detection of Denial-of-Service (DoS) attacks in IEEE 802.11p vehicular ad-hoc networks (VANETs) is proposed. The study is focused on the "jamming" of periodic position messages (beacons) exchanged by vehicles in a platoon. Probabilities of attack detection and false alarm are estimated for two different attacker models.
In this paper, we propose Geographic Stateless Vehicular Ad Hoc Network (VANET) Routing (GeoSVR), a novel geographic routing protocol that selects an optimal forwarding route using the width of the road to avoid local maximum and improves the forwarding algorithm to ensure the connectivity of the route between two neighbors in an urban VANET. GeoSVR uses the natural connective feature of an urban...
Road maps are important for several applications in vehicular networks. As a consequence, an updated map is essential for a proper behavior of such applications. In this paper, we focus on a map update application based on an infrastructure-to-vehicle communication with a high mobility. In order to understand the application's behavior, we analyze different performance criteria: System Goodput, Packet...
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...
IEEE 802.11p hardware is hard to find. Previous research efforts often relied on project-specific prototype implementations which are characterized by a high cost and are not always available to the entire research community. Commercially available turnkey implementations are rare and quite expensive compared to commercial of-the-shelf (COTS) IEEE 802.11a/b/g hardware. However, the difference between...
In WAVE applications, the safety information of neighboring vehicles must be collected as quickly and efficiently as possible. Safety applications broadcast their safety information periodically, but the delivery of the broadcast messages in IEEE 802.11p is unreliable. As the control channel has to share the Sync Interval (SI) with the service channels, access to the control channel by the safety...
VANETS extend the driver's horizon to decrease traffic accidents by utilizing IEEE 802.11p wireless networks. In high density traffic situations an overloaded communication channel leads to significant packet loss. To overcome this problem multiple channels can be used in IEEE 802.11p. This itself leads to adjacent channel interference and impacts the performance of nearby channels. In this paper...
End-to-end delay is critical for the real-time safety message delivery in Vehicular Ad Hoc Networks (VANETs). In this paper, we present an analytical model to evaluate the impact of transmission range on the end-to-end delay in 802.11p-based VANETs. Compared with the previous works, our model derives a concise expression of the transmission delay in saturated networks, and obtains the service rate...
Ad-hoc multi-hop broadcast protocols are usually used in vehicular networks to provide safety services. However, these protocols face several issues, namely broadcast storms, hidden nodes, and message delivery failures, that prevent safety applications from guaranteeing their required high message delivery ratio and low delays. In this paper, we tackle these issues using a novel cluster-based contention-free...
Vehicular ad hoc networks (VANETs) are an extreme case of mobile ad hoc networks (MANETs). High speed and frequent network topology changes are the main characteristics of vehicular networks. These characteristics lead to special issues and challenges in the network design, such as in medium access control (MAC). Due to the high speed and frequent network partitions, it is difficult to design a MAC...
Road accidents and traffic jams are the most important problems on the roads. Wireless Access in Vehicular Environments (WAVE) can be used as preemptive and informational measure. WAVE builds multi-path communication between vehicles and infrastructure nodes, where nodes share emergency and other information. In this paper we analyze the delay of emergency message transmission in multi-hop link, based...
In recent years the research on Vehicular Ad Hoc Network (VANET) has been paid much attention due to the development of wireless network becoming mature, people think highly of traffic safety issue, the popularity of Global Positioning System (GPS), promising applications of VANET being exploited. However, VANET has the essential property of rapid change of large scale network topology. Besides, the...
Vehicle-to-Vehicle (V2V) communication is an evolving research field that has potential to augment safety on our roads. Safety focused V2V communication also offers convenience and commercial applications in order to enhance driving comfort and pleasure. V2V communication demonstrates unique characteristics and consequently reliable network access has become crucial to exploit a wide spectrum of applications...
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