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Efficient protocols for data packet delivery in Vehicular Ad-hoc NETworks (VANETs) are crucial to guarantee the correct forwarding of data. However, communication in VANETs is a challenging task not only for the high mobility of the vehicles, but as recent studies have shown, there is a negative impact on protocol performances caused by an obstacle such as another vehicle in the line-of-sight (LOS)...
Concerning the phenomenon that common parking service could not satisfy the increasing demand of the private vehicle owners, an intelligent parking guidance system based on Zig Bee network and geomagnetic sensors was designed. Real-time vehicle position and related traffic information were collected by geomagnetic sensors around parking lots and updated to center server via Zig Bee network. On the...
Vehicular Ad-hoc Network, VANET, offers new opportunities for better road traffic management. Using vehicle to vehicle (V2V) and vehicle to infrastructure (V2I) communications, several research works were published on road traffic improvement in general and at road intersection in particular. One of the challenging problems is to minimize vehicles' waiting time at the intersection as well optimize...
Vehicular ad hoc networks (VANETs) allow vehicles to form a self-organized network without the need for permanent infrastructure. As a prerequisite to communication, an efficient route between network nodes must be established, and it must adapt to the rapidly changing topology of vehicles in motion. Improving efficiency and fairness for City Environment becomes a hot topic own to its increasing challenge...
We propose a novel position-based routing protocol Anchor-based Connectivity Aware Routing (ACAR) for Vehicular Ad-hoc Networks (VANETs), which considers both buses and cars as vehicular nodes running in both clockwise and anti-clockwise directions. ACAR is a hybrid protocol, uses both the greedy forwarding approach and the carry-store-and-forward approach to ensure the connectivity of the routes...
As a fundamental network property, Inter-Contact Time (ICT) determines the critical performance metrics of a vehicular ad-hoc network (VANET). In this paper, we extract the contact information from the traces of Global Positioning System (GPS) from public and semi-public vehicles in a large modern city, including both buses and taxis. By exploring the spatial and temporal properties of the contact...
Road safety has become a main issue for governments and car manufacturers in the last twenty years. The development of new vehicular technologies has favoured companies, researchers and institutions to focus their efforts on improving road safety. During the last decades, the evolution of wireless technologies has allowed researchers to design communication systems where vehicles participate in the...
The roadside unit (RSU) plays an important role in VANET environments for privacy conservation. In order to conserve the privacy of a vehicle, the issued certificate must be updated frequently via RSUs. If a certificate expires without being updated, the services for the vehicle will be terminated. Therefore, deploying as more as possible RSUs will ensure that the certificate can be updated before...
Scenarios for simulation are important for the performance of the Vehicular Ad hoc Networks. The paper proposed a more realistic scenario-the City Section Mobility Model and the Radio Propagation Model with Obstacles. They were added in NS2, and the performance of the routing protocol was simulated in the traditional scenario and the new one. Then the performance of DSR and AODV is simulated and analyzed...
In traffic safety applications for Vehicular Ad hoc Networks (VANETs), warning messages have to be disseminated whenever a dangerous situation occurs to alert nearby vehicles. Using inefficient broadcast schemes may lead to ineffective dissemination of warning messages causing broadcast storm problems. In the past, several approaches have been proposed to reduce the so called broadcast storm in multi-hop...
Mobility models or the movement patterns of nodes communicating wirelessely, play a vital role in the simulation-based evaluation of vehicular Ad Hoc Networks (VANETs). Even though recent research has developed models that better corresponds to real world mobility, we still have a limited understanding of the level of the required level of mobility details for modeling and simulating VANETs. In this...
One of the key aspects of any communication system is routing of packets. VANET is no exception and poses special challenges in routing techniques. Position based routing protocols are considered to be apt for vehicular networks [1] and to realize that a location service is being used. For a packet to be routed to a destination across the network, the destination's position is to be known in advance...
In recent years, new architectures and technologies have been proposed for Vehicular ad hoc networks (VANETs).However, the experiments to validate these proposals tend to overlook the most important and representative factors. Moreover, the scenarios simulated tend to be very simplistic (highways or Manhattan-based layouts), which could seriously affect the validity of the obtained results. In this...
Location privacy is one of the Quality of Privacies (QoP) in vehicular ad hoc network (VANET) and imperative for the VANET's full flourish. Frequent pseudonym changing can provide a promising solution to achieve location privacy, however if the pseudonyms are changed in an improper occasion, the solution is ineffective. In this paper, to improve the effectiveness of this kind of solution, we first...
Simulation of Vehicular Ad Hoc Networks (VANET) plays an crucial role on design and development of VANET including routing algorithms, mobility management and so on. In the paper, the SVNRCS system is presented to simulate VANET in realistic scenes. Its vehicle distribution and movement model are based on realistic GPS data. Thus it can simulate more real VANET environment. The architecture and implementation...
Nowadays, Vehicular Ad hoc NETworks (VANETs) attract more and more attentions both from academia and industry. Although it has achieved much success in the research field, large-scale deployments of VANETs are still lacking. One barrier facing us is that both governments and companies are doubtful about the performance of VANETs in large-scale deployment in real world. The connectivity of VANETs is...
Vehicular Ad hoc Network (VANET) is a new communication paradigm that enables the communication between vehicles on the road network which falls in two categories: 1) Vehicle to Vehicle (V2V) and 2) Vehicle to Infrastructure (V2I). It has opened door to develop several new applications like traffic engineering, traffic management, dissemination of emergency information to avoid hazardous situations...
In Vehicular Ad Hoc Networks (VANETs), the major communication challenge lies in very poor connectivity, which can be caused by sparse or unbalanced traffic. Deploying supporting infrastructure could relieve this problem, but it often requires a large amount of investment and elaborate design, especially at the city scale. In this paper, we propose the idea of Parked Vehicle Assistance (PVA), which...
Geographic message forwarding in vehicular ad hoc networks (VANET) has attracted much attention and become one of the most promising research areas recent years. In this paper, inspired with the intuition that drivers' route are with high regularity, we propose a prediction-based message forwarding strategy named Seer. Seer trains a 2nd-order Markov model based on long-term historic trip GPS data...
Information sharing among vehicles is an emergent issue in Vehicular Ad Hoc Networks (VANETs). Considering the mobility and limited connectivity of the nodes in a typical VANET, designing scalable schemes for information sharing is challenging. In this paper, we propose a distributed peer-to-peer (P2P) based architecture for information sharing in VANETs. We split the entire vehicular network into...
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