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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...
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,...
Vehicle-to-Vehicle (V2V) communications play a critical role in enabling important cooperative safety applications. V2V safety communications rely on broadcast of self-state information (e.g., position, speed, and heading) by each vehicle, which allows a vehicle to track its neighboring vehicles in real-time. One of the most pressing challenges in this research is to maintain an acceptable tracking...
Vehicular ad hoc networks (VANETs) have become a promising application of mobile ad-hoc networks (MANETs). Since an inaccurate traffic warning message will impact drivers' decisions, and misguide drivers' behavior, one of the main challenges in VANETs is to forward messages in such a way that the information content can be trusted by receiving nodes. In this paper, we proposed a reputation management...
Vehicular ad hoc networks (VANETs) are a particular category of mobile ad hoc networks (MANETs) characterized by a high mobility and a reduced connectivity. As a prerequisite to communication, an efficient route between network nodes must be established, and it must be adapt to the rapidly changing topology of vehicles in motion. This is aim of VANET routing protocols. The simulation scene was set...
The automotive industry is moving aggressively in the direction of advanced active safety. Vehicular safety communications applications cannot tolerate long connection establishment delays before being enabled to communicate with other vehicles encountered on the road. Therefore, the wireless channel access control protocol is of particular concern and needs to be designed efficiently. However, the...
Applications aimed at enhancing the experience of vehicular transportation have been increasing in recent years with the widespread diffusion of smart mobile devices with network capabilities and access to user location. Such applications include navigation systems and location-based timetables. However, most of these applications only use individual contextual information in order to provide useful...
VANETs continue to mature and their installation is becoming a reality. Many ideas have been exchanged on how best to balance privacy and security. The use of pseudonyms has been almost universally accepted as a critical part of this equation. Simulated results, using ns-3, demonstrate the need for more than a single road side unit (RSU) contact for pseudonym refill due to the limited number of certificates...
Broadcast is a critical component in ad-hoc wireless networks. Some vehicular network (VANET) applications in particular use broadcast communications extensively. VANETs exhibit a wide variety of node density and distribution patterns, so broadcast protocols designed to support these applications must be adaptive to those conditions. We show that the distance method of statistical broadcast can be...
Routing remains one of the key challenges in vehicular networks due to their special properties such as the high mobility and the intermittent connectivity. Almost all the efficient routing solutions proposed for VANETs are based on geographic information provided by the navigation systems widely deployed in the new generation of vehicles. Typically, in these position-based protocols, a source node...
In the near future vehicular networks based on wireless technology will be part of our lives. Efficient and robust routing algorithms will play a key role in the success of such technology. In this paper we present TrafRoute, an efficient and robust routing scheme for vehicular networks, suitable for both Vehicle-to-Vehicle and Vehicle-to-Infrastructure communications. TrafRoute introduces a novel...
Solutions for Vehicular Ad-Hoc Network (VANET) are challenging due to the intrinsic nature of the network which involves, by definition, node mobility, scarce or null fixed nodes and, at the current state of art, lack of solutions for the real-time tracking of positions. Moreover VANETs are meant to provide primarily a solution for the improvement of road safety, by the proper forwarding of messages:...
In this paper, we propose a tree-based adaptive broadcasting (TAB) algorithm for data dissemination to improve data access efficiency in vehicle communications. The proposed TAB algorithm first constructs a broadcast tree to determine the broadcast frequency of each data, and splits the broadcast tree into some broadcast wood to generate the broadcast program. In addition, this paper develops an analytical...
Because of shortage of raw materials, the energy-saving issues become popular in Vehicular Ad-hoc Networks (VANETs). A VANET is formed by traveling vehicles with communicating capability and thus it brings various applications. Navigation system is one of important applications in VANETs. The traditional navigation system usually plans a shortest path for users according to geographic maps but the...
Vehicular ad hoc networks (VANETs) provide the means to add convenience, services, and safety to the road. This paper introduces a means to adapt the concepts of Public Key Infrastructure for a VANET environment under the worst case scenario of a pseudonym shift every second. Regions are used to scale down the size of certificate revocation lists (CRLs), administrative overhead, and the search space...
The increased traffic density in urban areas should be handled by a robust collision avoidance and traffic control system that is based on decentralized inter-vehicle communication. In such a special ad hoc network traditional routing protocols cannot cope with the high mobility and low link reliability, while flooding based approaches consume too many resources. Our proposed solution, Carefully Localized...
We focus on the problem of efficient dissemination of available gateways information throughout a Vehicular Ad-hoc Network (VANET). Contrary to previous works, we also consider how the gateway discovery protocol affects user data flows that are routed to the infrastructure network. The cases of both delay-tolerant and delay-constrained user traffic are studied. We propose two schemes targeted at reliable,...
In VANETs(Vehicular Ad Hoc Networks), moving from one RSU's coverage region to another will bring reauthentication in the new security domain, which can be named security handover problem. In this paper, based on mobility predictability, we propose a novel anonymous communication scheme called SCPT to address the security handover problem. It uses hash chain for vehicle's anonymous authentication...
We consider the problem of designing cooperative driver assistance and collision warning systems in vehicular networks. In this problem each car has a small size state information message that should be received by its neighborhood within a short lifetime of L timeslots. Because of the safety nature of the application, communication reliability (success probability) and delay are of critical importance...
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