Showing papers on "Vehicular communication systems published in 1996"

Its: a short history and perspective on the future

Abstract: This article describes the dynamic but short history of Intelligent Transportation Systems (ITS). ITS combines high technology and improvements in information systems, communication, sensors, and advanced mathematical methods with the conventional world of surface transportation infrastructure. In addition to technological and systems issues, there are a variety of institutional issues that must be carefully addressed. Substantial leadership will be required to implement ITS as an integrator of transportation, communications and intermodalism on a regional scale.

Intelligent transportation systems in japan

Abstract: This article first reviews the history of Intelligent Transportation Systems (ITS) in Japan. It then looks at the Japanese approach to ITS, followed by a discussion of the status of development efforts in Japan.l

Experimental research on protocol of inter-vehicle communication for multiple vehicles

Abstract: This paper describes the study and field experiment of an optical inter-vehicle communication system which can be applied to Intelligent Transportation Systems (ITS). The study is mainly focused on the protocol development. For inter-vehicle communication, high transmission rate, high adaptability to vehicle formation change and high data reliability are required. In this paper the authors have proposed a new communication protocol which satisfies these requirements. In the experiment, four test vehicles equipped with transmitters, receivers and communication controllers ran on the test track. Actual communication was done successfully with vehicles running in various situations.

A mobile network architecture for vehicle-to vehicle communications

Abstract: A major technological component of the so-called "intelligent vehicles" is the capability of exchanging information directly among them and with traffic control centers, and of acting, to some extent, in cooperation. These direct communication capabilities on-board the vehicle have raised the interest of car manufacturers, and several studies and field trials have been undertaken. Current efforts should be aimed towards a strong integration between the infrastructural and the mobile network, because both are needed to jointly support advanced traffic control and route guidance applications effectively. In particular, inter-vehicle communications are needed to support real time vehicle-vehicle interactions, as in the case of cooperative driving and coordinated maneuvers. To carry the information needed to this kind of application, a dynamically reconfigurable network, strictly connected to a ground-based cellular network, is proposed. The present paper addressed the main characteristics of such a mobile network, related with synchronization, multiple access, power control and packet relaying issues. In particular, by exploiting the space diversity created by directional antennas, the complexity of the multiple access protocol is kept to a minimum.

Some applications of wireless communications in Intelligent Vehicle Highway Systems

Abstract: Intelligent Vehicle Highway Systems (IVHS) have generated a new challenge for communications industries. This is particularly true for mobile communications, since most essential IVHS communications links require wireless and mobile transmission. The IVHS and its major components are described. A generic block diagram for an IVHS network is presented. This block diagram defines the communications requirements for the IVHS network. The complete characterization of communication between the vehicle and the IVHS infrastructure is determined by the system architecture, however, by its very nature, this link is required to be wireless, mobile, and for the most part interactive. A survey of wireless technologies that have been tested, or implemented, and/or considered suitable for IVHS applications are discussed. Examples of operational and/or under development IVHS projects that applies the corresponding wireless technology are also provided.

Wireless applications for intelligent transportation systems

Abstract: This article looks at the growing trend in wireless applications for intelligent transportation systems (ITS). The author points out that the ITS standards specifications are almost 100% complete and that the fiscal year 1996 budget allocations include wireless electronic registration of commercial vehicles, real-time tracking and management of vehicle fleets, and customer service terminals for public transit.

Wireless technologies : dsrc, cellular, and gps

Abstract: This article gives an overview of three wireless technologies and their applications to Intelligent Transportation Systems. They include: dedicated short-range communications (DSRC) with readers and tags, cellular communications, and Global Positioning System (GPS) location.

Communication mediums for intelligent transportation systems

Abstract: This report describes many of the alternatives available in designing the communications subsystem of an intelligent transportation system (ITS) The various communication mediums, protocols, and terminals are extensively discussed A regional approach to communication subsystem design is introduced along with examples of typical systems and information on cost estimating and support considerations Lastly, perceived barriers to implementation of advanced communication technologies are discussed as well as strategies to overcome them This report will be extremely useful to those designing a communications system or overseeing the design of one

Intelligent transportation systems : applications to transportation demand management

Abstract: The primary focus of Intelligent Transportation Systems (ITS) is on traffic management systems, advanced traveler information systems, and so forth. Further, ITS is most readily identified with such systems in urban areas because the majority of transportation management infrastructures and traffic congestion exist in these densely populated areas. The overriding objective of ITS is to optimize the quality and efficiency of vehicle, passenger and goods transport of our surface transportation systems. With increasingly limited resources, however, further significant expansion of the infrastructure is unlikely--thus, ITS and other transportation management methods aimed at making more efficient use of the existing infrastructure are paramount. In other words, ITS must not be restricted to supply-side options. Transportation demand management (TDM) can potentially have a significant impact on congestion, energy conservation and the environment. This paper presents the results of a preliminary study of ITS implications for TDM. It reports on a number of related projects undertaken around the U.S. and in Canada. It offers recommendations for expanding ITS involvement in TDM.

Application of vehicle specific information in adaptive intersection traffic signal control

Abstract: Intelligent Transportation Systems (ITS) involve the use of information, communications, and computer technology to update and enhance the capabilities of transportation systems. Incorporating advanced technology into traditional transportation systems provides completely new functions to facilitate more productive and safe transportation of people and goods. Thus, ITS provides a new paradigm for planning, managing, operating, and maintaining transportation systems. This paper reports on the evaluation of a new ITS concept for enhancing traffic signal control. The ultimate deployment of the concept is dependent on future incorporation of advanced technology into traffic control and vehicle systems.