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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...
Inter-vehicle communication find increasing application in futuristic intelligent transport systems and ad hoc mobile networks. However, the channel statistical properties for these mobile-to- mobile channel are quite different from traditional cellular wireless networks, and need to modify the simulation method. The paper proposes a method to simulate the Rician-faded mobile-to-mobile local in three-dimensional...
The dynamic setting of the node's power value is not involved in the traditional VANET protocol. Thus, the node energy could not be effectively saved, and the channel interference between nodes is likely to be caused. This paper proposes a new vehicle network routing technology based on power control--- PAODV, PAODV mainly uses the power control on link layer, and it is realized through MAC protocol...
In this paper, a centralized polling-based medium access (MAC) scheme, namely, the IEEE 802.11e hybrid coordinator function (HCF) controlled channel access (HCCA), is considered as an alternative to the current MAC protocol used in IEEE 802.11p for Wireless Access in Vehicular Environment (WAVE). At first, the limitations of the current enhanced distributed channel access (EDCA) are examined, and...
In ad hoc networks the broadcast nature of the radio channel poses a unique challenge because the wireless links have time-varying characteristics in terms of link capacity and link-error probability. In mobile networks, particularly in vehicular ad hoc networks (VANETs), the topology is highly dynamic due to the movement of the nodes, hence an on-going session suffers frequent path breaks. In this...
Vehicle Ad Hoc Networks (VANET) may exhibit different behavior depending on traffic and the time of day. Consider the potential worm attack in time-variant VANET channel, we use measured vehicle traffic data to model VANET worm spreading and patching. We also discuss the contributing factors for the differences observed.
Automotive networking on US highways is moving into high gear. Smart cars, connected vehicles, intelligent transportation systems (ITS), vehicular ad-hoc networks (VANET), and vehicle telematics represent parallel and overlapping technologies and services that will define the future of the American roadway systems. The integration of computing technology and expanding communication services is driving...
With an emergence of vehicular ad hoc networks, it is highly likely that in the near future vehicles on the road will be used as mobile probes for collecting and distributing traffic information such as the travel time. Generally, the travel time on a road section can be estimated from the global positioning data collected by a mobile probe. The more frequent the positioning data are collected or...
Because of restricted mobility patterns, multi-hop routing, and wireless channel conditions, streaming video over a vehicular ad hoc network (VANET) is a daunting task. This paper demonstrates that H.264 codec flexible macroblock ordering (FMO) with receiver error concealment is capable of streaming good-quality video across a VANET. FMO is shown to be superior to other error resilience techniques...
In vehicular ad-hoc networks, status update messages are used to disseminate vehicle state information so that each vehicle can track movements of its neighbors. In this paper, we focus on the aggregated power level from this kind of active safety messages and its impact on DSRC channel quality. With macroscopic model and LWR (Lighthill-Whitham-Richards) PDE, we show how the probability distribution...
IEEE 802.11-based Vehicular Ad Hoc Networks (VANETs) are becoming important in enhancing road traffic safety. Drivers can proactively detect and avoid unsafe situations using safety message disseminated by VANETs. There are two common dissemination techniques: event-triggered multi-hop relaying (flood) and periodic one-hop broadcast (beacon). A basic idea of Location Division Multiple Access (LDMA)...
Focusing on large-scale vehicular ad-hoc networks (VANETs), we consider the interplay between single-hop channel models and large-scale network connectivity. Building on a realistic urban traffic simulator, we progressively increase the sophistication of the wireless link while evaluating the resulting connectivity profiles. Our results show that large-scale VANET connectivity, whose understanding...
The success of VANET safety mechanisms, e.g. pre-crash warning and collaborative collision avoidance, relies on good proximity-awareness of each subject vehicle. Prior analysis shows that a self-information dissemination control on each car, which adapts communication rate based on estimation error and channel congestion, can achieve higher tracking accuracy than others in a multi-access channel....
Safety applications developed for inter-vehicle communications (IVC) are characterized by strict reliability and delay requirements, thus relying on multi-hop broadcasting to disseminate the traffic alert messages to all surrounding vehicles. However, the conventional broadcast schemes suffer from the so-called "broadcast storm problem", a scenario in which contention and collisions happens...
Vehicular wireless communication should be able to provide vehicles reliable and efficient data transmission for various especially safety applications. The multi-channel medium access control (MAC) mechanism is used to enhance the system performance. However, the current version of multi-channel MAC protocol based on IEEE1609.4 and IEEE802.11p is not fully applicable in vehicular environment. In...
This paper focuses on the mathematical analysis of two forwarding schemes in Vehicle Ad Hoc Networks (VANETs): Position-Based Routing (PBR) and Contention-Based Forwarding (CBF). Although PBR and CBF have been intensively studied, most of the work was based on simulations without in-depth mathematical analysis. It is well known that the received power at a receiver in VANETs is stochastic, thus, there...
Wireless vehicular communication systems require the design and implementation of robust and efficient communication policies to provide the strict quality of service needed by traffic safety applications while guaranteeing the system's scalability. To efficiently guarantee such requirements, the authors have developed an opportunistic-driven adaptive radio resource management mechanism that adapts...
Due to the vehicle's movement and inherent characteristics of wireless channel, how to discover and retrieve the required contents has become a challenging issue in a hybrid network including vehicular ad hoc networks (VANETs) and the Internet. In this paper, we propose a social cluster-based P2P framework that estimates similarity and connection condition among peers to provide mobile peers efficient...
Directional antennas in Ad hoc networks offer more benefits than the traditional antennas with omni-directional mode. With directional antennas, it can increase the spatial reuse of the wireless channel. A higher gain of directional antennas makes terminals a further transmission range and fewer hops to the destination. This paper presents the design, implementation and simulation results of a multi-channel...
Evaluation of vehicular ad-hoc networks (VANETs) over real environments is still a remaining issue for most researchers. There are some works dealing with common 802.11 analysis over real vehicular environments, which carry out performance tests to measure the quality of the communication channel and justify results according to physical and MAC conditions. There are only a few works regarding multi-hop...
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