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This paper presents the study of an access point (AP) deployment strategy which aims to reduce the energy expenditure of ubiquitous motorway network coverage while ensuring Quality of Service (QoS) requirements are maintained at acceptable levels. For this reason, we, in this paper, study the consumption of energy in a scenario where three operational APs are deployed on a motorway with and without...
With the rapid growth of high data rate applications, significant amount of energy is consumed by base stations' equipment. In order to save energy, it is better to deploy fewer base stations (BSs) or switch off as many as possible. However, this is usually attained at the expense of quality of service (QoS). In this paper, we deploy fewer BSs to reduce energy consumption and study the performance...
The security in vehicular ad hoc networks (VANETs) is receiving a significant amount of attention in the field of wireless mobile networking because VANETs are vulnerable to malicious attacks. A number of secure authentication schemes based on asymmetric cryptography have been proposed to prevent such attacks. However, these schemes are not suitable for highly dynamic environments like VANETs, because...
Potential safety and non safety applications of vehicular network provide solutions to current traffic system. Dynamic topology of the vehicular communication network and high speed of the vehicles make it a challenging task of authenticating the users. Researchers have proposed different types of authentication mechanisms for secure vehicular communication. We propose a new and practical card-based...
In order to construct the highway networks, the road tunnels become an inevitable deign to accommodate physical environment elements (e.g., mountains and rivers) in the world. For the recent constructed tunnels, the communication system within the tunnel is planed and designed ahead of time. However, the cost to build and maintain a complete communication system for existing tunnels may not be a cost...
In high-speed mobile OFDM communication systems, receiving characteristics are degraded badly by channel time variation. One solution is to rotate a circular array antenna so as to decrease the speed of the receiving antenna relative to the ground. In the conventional approach, antenna radius was controlled to match vehicle speed, but realizing a radius control system is difficult. Our goal is to...
Multi-channel wireless radio operations, Wireless Access in Vehicular Environments (WAVE) mode, medium access control (MAC), and physical layers (PHYs), including the operation of control channel (CCH) and service channel (SCH) interval timers, parameters for priority access, channel switching and routing, management services, and primitives designed for multi-channel operations are described in this...
Cooperative Driving Systems are promising significant benefits for consumers. However, for their deployment, lane-level vehicle localization is a crucial enabling technology. This paper analyses technical challenges and presents current research activities in this field.
Vehicle intelligent terminal system for engineering equipment could realize condition monitoring, fault diagnosis, time based maintenance intelligent management and long-distance operation management synthetically. Adopting computer technique, sensor technique, fault diagnosis technique and wireless communication technique, vehicle intelligent terminal system for engineering equipment is researched...
Cooperative vehicular systems are being developed to improve traffic safety and efficiency through the dynamic exchange of information between vehicles and between vehicles and infrastructure units. Different communication protocols and policies have been proposed in the literature with diverse objectives, normally taking into account network performance metrics only. This paper illustrates the need...
We present DTMon, a dynamic traffic monitoring system using vehicular networks, and analyze its performance in free flow (i.e., non-congested) traffic. DTMon uses roadside infrastructure to gather and report current traffic conditions to traffic management centers and equipped vehicles. We analyze how traffic characteristics such as speed, flow rate, percentage of communicating vehicles, and distance...
Recently Intra Vehicle Communication received great interest from the automotive industry and Ultra Wideband (UWB) technology considered as one of the potential candidate for this system. Goal of this paper is to compare UWB pulse modulation schemes like time hopping pulse position modulation (TH-PPM), direct sequence pulse amplitude modulation (DS-PAM) and multi-band orthogonal frequency division...
Mobile-to-mobile communication, direct, not via base stations, is an upcoming challenge. Different as in mobile-to-mobile communications for Car-to-Car (C2C) or Vehicle-to-Vehicle (V2V) communication no base stations exist. The transmitter as well as the receiver is moving and the propagation paths change continuously. No high gain directive antennas, radiating several watts (of power) are part of...
For a well working Car-to-Car (C2C) communication system the handling of the radio channel is a challenging task. The fast changing environment as a result of a time variant behavior of the channel, and the antennas, are the two most important factors influencing the C2C transmission channel. To analyze the impact of both on the performance of such a communication system is a difficult task. A possible...
The near future will see production vehicles equipped with intelligent Advanced Driving Systems using various sensor modalities. Meanwhile, other aspects such as Vehicle-to-Vehicle (V2V) communications have emerged as means of assisting drivers. We propose a framework (V2Eye) in which V2V augments and extends the range of visual sensors in ways that have yet to be explored.
Supporting QoS for safety-critical applications for intelligent transportation systems accentuates the analytical modeling of delays in vehicular networks. Such analysis is, however, challenging due to the dynamics of such a network. We make progress by deriving lower- and upper-bounds for information dissemination delays in multi-hop vehicular networks using two different routing schemes. In particular,...
This standard specifies the electronic payment service layer and profile for Payment and Identity authentication, and Payment Data transfer for Dedicated Short Range Communication (DSRC) based applications in Wireless Access in Vehicular Environments. This standard defines a basic level of technical interoperability (vehicle-to-roadside) for electronic payment equipment, i.e., onboard unit (OBU) and...
In this paper, we have adopted a game theoretic approach to consider optimal assignment of targets to vehicles. We have taken optimality to mean that the cost of vehicle-target assignment is minimized where the cost is the sum of the Euclidean distances between a vehicle and its assigned target. This occurs when the set of targets is assigned to their nearest vehicles. In other words, each vehicle...
A new three-dimensional (3-D) geometry-based reference model for cross-polarization discrimination (XPD) is proposed for narrow-band vehicle-to-vehicle (V2V) channels. The model is based on the superposition of polarization components on conservation-of-polarization planes (CoP-planes). This novel approach is used to derive the XPD at each distance. To the best of our knowledge this is the first purely...
We propose the network-coding-based relay MAC protocols that aim at providing drive-thru Internet services to the moving vehicles by utilizing the dedicated short range communication (DSRC) over vehicular networks. Our proposed MAC protocols can adaptively switch between two communications modes according to the highway traffic-load conditions. When the highway traffic load is heavy, our system works...
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