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Data dissemination over long distances in urban scenarios is the foundation of many VANET applications, but rapid shifting in network topology, unstable quality of wireless communication and channel capacity constraints of VANETs pose many challenges to data dissemination. In response, we propose a connectivity-aware data delivery mechanism on the basis of an improved greedy broadcasting. Moreover,...
Intra-vehicular wireless sensor networks is a promising new research area that can provide part cost, assembly, maintenance savings and fuel efficiency through the elimination of the wires, and enable new sensor technologies to be integrated into vehicles, which would otherwise be impossible using wired means, such as Intelligent Tire. The most suitable technology that can meet high reliability, strict...
In this paper, we address the beacon congestion issue in Vehicular Ad Hoc Networks (VANETs) due to its devastating impact on the performance of ITS applications. The periodic beacon broadcast may consume a large part of the available bandwidth leading to an increasing number of collisions among MAC frames, especially in case of high vehicular density. This will severely affect the performance of the...
This paper proposes roadway electrification to facilitate wireless charging to accomplish two purposes. The system allows electric vehicles (EVs) traveling on an electrified lane to receive a charge update. It also permits charging of a low-profile autonomous emergency assist vehicle. Several vehicles of this type would be stationed along a congested roadway allowing an automated and quick response...
Fast transmission of event-driven warning messages and energy conservation are primary concerns to design robust Hybrid Sensors and Vehicular Networks (HSVNs). In last few years, several protocols have been proposed to address these issues. However, the tradeoff between energy consumption and latency has not been carefully studied and sometimes it is given higher priority than event detection efficiency...
The vehicular wireless ad hoc network (VANET), a specialized wireless sensor network, is booming to provide safety and comfort for passengers. Special features of VANET, such as high mobility nodes and large scale node population, make the Quality of Service (QoS) task extremely challenging. To provide Quality of Service (QoS) to traffic safety and entertainment applications in VANET, we propose a...
Previous work demonstrated that adding a wireless link to a distance control between vehicles has effect on its performance. This paper presents an algorithm that minimizes the effect of the transmission delay and the packet losses of said wireless link. The extrapolation algorithm is implemented by a block added just after the link, so that it is transparent to the control system and it does not...
In this paper, ultra-wideband impulse radio(UWB-IR)system inside a vehicle is considered to construct internal vehicle wireless sensor network with better performance. In a vehicle, a direct path is likely to be blocked by the seat and passengers. The channel model characteristic in a vehicle is different from other wireless systems. When using UWB systems, other wireless systems in the same frequency...
Recently, vehicular sensor networks (VSNs) have emerged as a new wireless sensor network paradigm that is envisioned to revolutionize driving experiences and traffic control systems. Many existing routing protocols for VSNs have good performance on data routing in a city environment. In this paper, we propose a traffic control aware routing for VSNs, which is called PUT. It considers two modules of...
This paper addresses the problem of assessing the effect of communication delays on the control performance of a platoon of two vehicles. We consider Bluetooth communication and develop a simple stochastic model for the Bluetooth delay distribution. It is shown that due to the long tails of this distribution, the computation time of a Monte Carlo approach would be prohibitive when assessing the effect...
Vehicles in Intelligent Transportation System employ IEEE 802.11p/1609 protocols to communicate with other vehicles or roadside infrastructure within a specific area. Messages related with traffic safety can be delivered timely for collision avoidance and etc. Meanwhile, non-safety related infotainment messages can also be transmitted besides safety-critical information. Many of the safety critical...
In this paper, the performance of vehicle to infrastructure (V2I) communications is evaluated based on the IEEE 802.11a protocol at 5.8GHz for ubiquitous transportation sensor networks. The end-to-end delay and fairness are evaluated for traffic information services.
Present Traffic Light Controllers (TLC) are based on microcontroller and microprocessor. These TLC have limitations because it uses the pre-defined hardware, which is functioning according to the program that does not have the flexibility of modification on real time basis. Due to the fixed time intervals of green, orange and red signals the waiting time is more and car uses more fuel. To make traffic...
Intelligent Transportation Systems are based on the acquisition of urban traffic information timely and accurately. This paper puts forward a prototype system of Wireless Traffic Information Service System(WTISS). In WTISS, vehicles equipped with wireless communication module are regarded as moving sensors on traffic network. Road-side station can get traffic status by analyzing data collected by...
In this study, we propose intersection collision avoidance system in preventing traffic crashes at typical urban intersections. The proposed intersection crash prevention system would display the crash warning messages to the drivers when crash-prone conditions are detected through the sensor system installed along intersection approaches. It would further change the traffic signal setting in real-time,...
The emergence of ubiquitous communication helps make safer and unobstructed street. Sensor detection is a valid technology to collect and process traffic data (vehicular speed, vehicle density, images from street) with the help of equipped sensors under the road or installed along the street. Vehicular sensor network (VSN), developed from wireless sensor network (WSN), is characterized by unlimited...
This paper presents a traffic monitoring system implemented through Wireless Sensor Network (WSN) technology within SAFESPOT Project funded by the European Community. The aim of this project is to provide a flexible, robust, low-cost and low-maintenance wireless solution for obtaining traffic-related data that can be used for automatically generating safety warnings at black spots along the road network...
Ultra-wideband (UWB) technique attracts attention from automotive manufacturers as a potential way to construct intra-vehicle wireless sensor network. This paper reports our preliminary effort in measuring and modeling the UWB propagation in the commercial vehicle environment. Two cases of time domain channel measurement results are reported. In one case, the antennas are inside the engine compartment...
Currently, vehicular sensor network (VSN) has been paid much attention for monitoring the physical world of urban areas. We have studied VSNs by utilizing about 4000 taxies and 1000 buses equipped with GPS-based mobile sensors in Shanghai to constitute a virtual vehicular sensor network. The communication-connection intermittence makes the routing issue nontrivial when delay-tolerant applications...
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