Showing papers on "Vehicular communication systems published in 2001"

Traffic information gathering via cellular phone networks for intelligent transportation systems

Abstract: Location information obtained and continuously updated from vehicular-based cellular phones is collected, processed and used as a basis for input to Intelligent Transportation Systems, in particular to Real Time Urban Traffic Guidance for Vehicular Congestion and Intelligent Traffic Control Systems. Location information that forms the basis of the present invention is obtainable from wireless location systems such as GSM in Europe, CDMA in the USA, or PDC in Japan, and depends on supporting technologies, which are in the process of perpetual improvement. Relying on cellular networks location system capabilities to provide moderately reliable position information, the records of vehicle phones coordinates, timing, etc., are collected, updated and stored in the Traffic Service Center database. Those records together with digital maps are fed into mathematical models and algorithms that construct lists of vehicles traveling on various road sections, traffic loads at particular road sections, real time travel times along all road sections resulting from traffic congestion in particular areas, turning loads for signal intersections, and other key parameters necessary for real time functioning of Intelligent Transportation Systems, in particular of Intelligent Traffic Control Systems, Route Guidance Systems, etc.

Performance evaluation of a multi-station shared vehicle system

Abstract: In recent years, shared vehicle systems have garnered a tremendous amount of interest as an innovative transportation paradigm which can potentially alleviate traffic congestion, improve air quality, and make surface transportation more efficient. In a multi-station configuration however, these systems place an additional burden on both users and system operators to make the system successful. Intelligent transportation technology can play a key role in making these systems user-friendly, easy to manage, and efficient. However, these systems will not necessarily succeed through the blind application of separate ITS technology bundles; there is a need to tightly integrate different types of ITS technology. Further, it is important to have quantitative performance measures to measure system efficiency. In this paper, we define various performance measures for multi-station shared vehicle systems and demonstrate their use in a real-world, intelligent shared electric vehicle system operating on the University of California-Riverside campus. This system has been set up as a "testbed" to improve our understanding of the operating details of a multi-station shared vehicle system and to identify the critical operating issues to make such systems successful.

Transportation technologies : implications for planning

Abstract: Transportation is rapidly being changed by new technologies, such as Intelligent Transportation Systems (including smart cards, on-board diagnostics and information systems, and smarter highways, transit, automobiles, logistics systems, and other information systems). the range of options and their impacts will continue to expand as new technologies are introduced over the next two decades, and may alter transportation systems in many ways. For example, electric, hydrogen, or hybrid electric-petroleum vehicles may be introduced that would substantially alter emissions and fuel characteristics of the fleet, and potentially pose challenges in terms of system operations and finance. Smart card technologies could greatly improve the feasibility and convenience of a variety of pricing options for road use, parking, and transit fares. Monitoring and information systems could enable travelers to time trips and select routes to avoid congestion, reducing it in the process. Advanced traffic management systems could increase road capacity significantly while improving safety and respecting other objectives such as pedestrian comfort. Over the longer run, automation could make order of magnitude improvements in safety, capacity, and convenience. Whether and to what extent these technologies become a significant element of the transportation systems will depend, however, not only on technological developments but on both public and private decisions about the technologies' desirability and usefulness. System-wide applications and high market penetrations of new technologies are likely to have vastly different benefits and costs than the piecemeal applications that are currently proceeding.

Research issues in intelligent transportation systems

Abstract: This paper presents a review of the state of the art on Intelligent Transportation Systems. ITS involves a large number of research areas and, therefore, this paper focus on those we believe to be the most relevant. The main purpose is to study the achievements attained in the last years and to give an overview of possible directions towards future research.

Multi-Hop Control Scheme On Vehicular Information BROadcasting Relay (VIBROR) Protocol for Inter-Vehicle-Communications

Abstract: This paper deals with Inter-Vehicle Communications (IVC) for advanced Intelligent Transport Systems (ITS). lVC makes it possible to exchange real-time information among vehicles. We focus on the packet-based IVC, where intelligent equipments in vehicles communicate with each other automatically in wireless channels to exchange their transportation information. The authors presented Vehicular Information BROadcasting Relay (VIBROR) protocol 111 in order to realize the multihop transmission scheme for broadcasting information without any complex negotiation among vehicles. In this paper, we deal with priority control and fdtering control of relayed information as effective buffer managements on the VIBROR protocol.

Multi-hop control scheme on Vehicular Information BROadcasting Relay (VIBROR)

Abstract: This paper deals with inter-vehicle communications (IVC) for an advanced intelligent transport systems (ITS). The IVC makes it possible to exchange real-time information among vehicles. We focus on the packet-based IVC, where intelligent equipments in vehicles communicate with each other automatically in wireless channels to exchange their transportation information. The authors presented Vehicular Information BROadcasting Relay (VIBROR) protocol in order to realize the multi-hop transmission scheme for broadcasting information without any complex negotiation among vehicles. We deal with priority control and filtering control of relayed information as effective buffer management on the VIBROR protocol.

An ultra-wide band cdma system for vehicle-to-vehicle communication

Abstract: With increase of the traffic situation in recent years research has focused on the use of communication between vehicles. By providing data such as the speed, trajectory of a vehicle, and other information to other vehicles, it becomes possible to predict dangerous situations and take appropriate action, and thus decrease the number of traffic accidents and improve capacity of highways. In this paper the authors examine the problem of multipath in inter-vehicle communication systems. It is a serious problem in all types of mobile communications.

Study on radio transmission for 5.8 ghz dsrc

Abstract: The authors conducted the study on DSRC (Dedicated Short-Range Communication) using 5.8 GHz band microwave for vehicle-roadside communication of intelligent transportation systems (ITS), with a particular focus on the radio transmission characteristics in the toll gate environment, actions to cope with such characteristics, and development of electromagnetic wave absorbing materials. The results of the study are presented in this paper.

Development of a high-speed dsrc multimode terminal using software defined radio technology

Abstract: Various info-communication services in the Intelligent Transport Systems (ITS) must take an important role in safe and comfortable driving, which services are provided with cellular telephone systems, Dedicated Short-Range Communications (DSRC), and digital broadcasting television. Especially, the DSRC from roadside to vehicles are expected as a local ITS services. The DSRC is the basis for ITS applications like electronic toll collection (ETC), traffic and traveler information, public transport, emergency dispatch services, parking management, etc. However, new services may require new on-board equipment. Furthermore, it is necessary that the content provided by DSRC service is revised or expanded with a gradual improvement on infrastructure of DSRC info-communication systems. Similarly, wireless communication technology related to vehicular terminal equipment is progressively improved. As a result, even signal processing scheme at the low-level or the physical layer of the DSRC applications will need upgrading from an existing system to an advanced one. Software defined Radio (SDR) technology provides an efficient and comparatively inexpensive mechanism for the production of multi-mode, multi-band, multi-functional wireless devices that can be enhanced using software upgrades. Some experimental multi-mode wireless terminals using SDR technology, which were basically designed with a usage of cellular telephone systems, have been reported. In this paper, however, a high-speed DSRC multimode-terminal using SDR technology, which has been expected as a signal-processing platform of ITS info-communications, was examined.

Intelligent Systems in Traffic and Transportation

Abstract: Recent scientific and technological advances in the fields of Artificial Intelligence, Computational Intelligence, Optimization-Metaheuristics, Geographical Information Systems, Simulation and others allow to build Intelligent Systems, which are able to support decision analysis and problem solving in the field of Traffic and Transportation.Examples of those Intelligent Systems have been elaborated and published during the last years. Therefore, in January 2000 a Minitrack ?Intelligent Systems in Traffic and Transportation? was organized for the first time within the frame of the Decision Technologies for Management Track of the HICSS-33. This Minitrack addressed the modeling and the implementation aspects of Intelligent Systems to solve important real world problems in Traffic and Transportation.During HICSS-34, the Minitrack Intelligent Systems in Traffic and Transportation takes place a second time. The Minitrack focuses on Intelligent Systems, which are able to assist the design phase (strategic planning) of Traffic and Transportation systems and/or the management-phase (tactical and operational planning). The purpose of transportation logistics is to design, to organize and to manage transportation in order to meet customer service demand, cost, and environmental requirements. Such logistics systems must comply with regulations on traffic, laws on labor and other types of constraints. In the field of transportation logistics we will focus on the analysis of urban, regional and intercity transportation networks for both passenger and freight transportation. Complex hybrid-type systems, which include air, road and rail transportation are of particular interest.Intelligent Systems, which are designed to solve real world applications in Traffic and Transportation, are built based on an advanced software engineering concept including object-oriented software development and integration with non-standard databases and GIS.On the algorithmic side several so-called Intelligent Techniques coming from AI, the OR and the CI, such as Tabu Search Metaheuristics, Evolutionary and Genetic Algorithms, Constraint Programming, but also high performance Optimization or Simulation techniques are used.Due to the increasing interest during HICSS-34, the Minitrack Intelligent Systems in Traffic and Transportation consists of 3 sessions with all together nine presentations, where five of them are in Traffic and four in the Transportation field.Two papers deal with Multi-Agent Systems in Traffic Management and Control. One paper proposes an approach for designing traffic responsive and coordinated ramp control using a self-adapting fuzzy system. Finally, there are two papers dealing with Air Traffic. One of them considers an Airport Gate Assignment Problem. The proposed system dynamically assigns airport gates to scheduled flights based on passenger's daily origin and destination flow data. The other one deals with Runway Operations Planning and Control.In the Transportation, related sessions of the Minitrack there are two papers dealing with scheduling type problems. One of them proposes a solution of Real World Train Timetabling Problems, the other deals with Dynamic Vehicle Dispatching using several techniques such as agents and genetic programming. One presentation proposes Real-Time Decision Tools for the Trucking Industry. Finally, a case study of the Deutsche Post Transportation Networks is used to illustrate how large organizations in the logistics area build their Operations Centers in order to perform the following functions: performance measurement, online-monitoring and control, customer care and marketing.The nine presentations cover some of the most important fields of Traffic and Transportation. State of the art Intelligent Techniques are used to implement Intelligent Systems that solve real world problems.