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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...
In this paper suggestion FPC for antenna design not only easy to control the antenna pattern on desired direction and radiation magnitude but also effective and quickly solved the complex tuning parameters of antenna application. Flexible printer circuit (FPC) board serves planar wireless antenna design. Effectively to supersede the antenna based on the traditional fixed printer circuit board (PCB)...
Mobile phone has become a powerful platform for people-centric computing. It is now a necessary part of everyday life for many people. A growing number of mobile computing applications are on the rise, centered around the user's daily life. In those emerging applications, location dependent systems have been identified as an important component. This paper presents the architecture and implementation...
The paper proposed a structure measure of multicast tree using FPN( fuzzy Petri net) model with the concept of IRS(immediately reachable set) in MANET(Mobile Ad Hoc Networks). It allows structured representation of network topology, and improves the efficiency of the ad hoc network routing scheme. Therefore when a packet is to be multicast to a group by a multicast source, a heuristic algorithm is...
Mobile communication services and Location based services are challenging application areas of wireless communications. Many applications were developed which require mobile navigation. The most known navigation systems are car navigation systems. Fewer advances have been made in pedestrian navigation systems (PNSs). There are some targeted achievements but the most challenging task is to develop...
Advances in wireless communication technologies as well as the low cost of wireless equipment have increased the ubiquity of network connectivity, as is illustrated by the large deployment of IEEE 802.11 access points (APs). Anytime, anywhere, users are being connected to networks and consequently they expect more services on their mobile devices. Internet access from vehicles, in particular short...
With the increasing safety requirements in automation management, an effective vehicle management system is becoming more and more necessary and urgent in all departments. Based on widely application of the advanced information technologies, a practicable system of vehicle dispatching and monitoring is designed for flight service in this paper. Firstly, the target of the system is presented; Secondly,...
Based on the wireless data transmission technologies, the vehicle-mounted wireless transmission terminal is able to provide reliable, up-to-date and accurate transport information for the moving vehicle, which contributes towards efficient road use, better traffic flow and greater road safety. The design of this vehicle-mounted wireless transmission terminal is based on ARM embedded technology and...
In recent years, many researches and developments on ITS have been carried out to solve many problems in road traffic. IVC (Inter-Vehicular Communications) is the key technology to realize the next generation ITS. Vehicles install telecommunication equipments, and exchange safety information directly with each other. The authors have developed Vehicular Collision Avoidance Support System (VCASS) based...
Location based services (LBS) enables mobile users to have access to information based on their current geographical location. LBS are an important aspect of the ubiquitous wireless world and are paving the way to provide users with customizable services anywhere and at anytime. It is worth noting that there are different accuracy requirements for different LBS and not all location methods can provide...
The increasing number of wireless communications applications in mission critical tasks and lifeline areas demand increased wireless communications reliability. Radio quality prediction for mobile terminals will play a key role in enhancing this reliability. Time-series radio quality prediction (TSRP) methods, which predict future radio quality based on past radio quality measurements, have been proposed...
In a wireless channel with a large delay spread, a detection probability of conventional TDoA (Time Difference of Arrival) positioning algorithms cannot satisfy the U.S. E-911 (Enhanced-911) standard. In this paper, we propose an improved TDoA-based tracking algorithm for mobile-WiMAX (Worldwide Interoperability for Microwave Access) systems. The position of a MS (Mobile Station) is estimated by the...
Today Vehicular Ad-Hoc Networks (VANETS) are a promising field for increasing comfort and safety on the road. They have the potential to connect cars with each other and thereby extract information about road conditions or dangers that drivers can't ldquoseerdquo, e.g., the end of a traffic jam behind a curve. In this article we will focus on the practical aspects of VANETs and provide an elegant...
Wireless networking technologies permit a great deal of convenience for mobile users. However, as is often the case, increased levels of technological freedom means there is more potential for abuse and misuse of these services. In this work we find the uptake of wireless networking technology has risen rapidly in recent years and the perceived awareness of security issues has also been heightened...
An inter-vehicle communication system, called vehicular ad hoc network (VANET), is one of the most promising applications of a mobile ad hoc network (MANET). One of the important issues in VANET is scalability. Compared with topology-based routing protocols, a routing protocol using position information may alleviate the issues of scalability or control overhead. Car navigation systems using a global...
This is the first study and field test analysis for DSRC (Dedicated Short distance Radio System) Vehicle wireless communication system design with first prototype developed WAVE (Wireless Access in Vehicle Environment) system platform in which IEEE802.11p and IEEE1609 standard software have been implemented. In the field test, packet reach ability as one of parameter for system evaluation has been...
In wireless multihop data message transmission by multiple mobile computers in ITS systems, even though in an area with sparsely distributed mobile computers, mobility of a computer with transmitting data messages helps to achieve high data message transmission ratio. This paper proposes data message transmission along a sequence of roads detected by a GPS satellite navigation system. Due to combination...
In wireless multihop data message transmission by multiple mobile computers in ITS systems, even though in an area with sparsely distributed mobile computers, mobility of a computer with transmitting data messages helps to achieve high data message transmission ratio. This paper proposes data message transmission along a sequence of roads detected by a GPS satellite navigation system. Due to combination...
This paper has shown that U2VAS fulfills all requirements of a truly modular and flexible communication stack for VANETs. Beyond the framework, the current implementation already contains several forms of communication, positioning and security mechanisms. We invite interested developers to join our effort and contribute to the further development of U2VAS.
C-VeT's backbone is based on the UCLA's IEEE 802.11 campus-wide wireless infrastructure and is complemented by a wireless mesh provided by MobiMesh. The nodes participating in the mesh are installed in strategic campus location and perform packet routing as well as serve as access points for the mobile nodes. The mesh core network is deployed using IEEE 802.11a interfaces at 5.9 GHz and directional...
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