Showing papers on "Vehicular communication systems published in 2002"

An adaptive peer-to-peer collision warning system

Abstract: A cooperative vehicle collision warning system is made possible by the progress in advanced positioning systems and wireless communication technology. We report our work in developing a cooperative intersection collision warning system that is not limited by the requirement of line-of-sight. The novel elements of the system include the use of a dynamic ad hoc wireless network for peer-to-peer data sharing, a new intersection collision warning algorithm, and a flexible and extensible software architecture and system design. The very same system is also capable of collision warning for other scenarios such as frontal and rear-end. Further, the tunable parameters in the algorithm make it possible for the system to adapt to the preference and capability of each individual driver.

A peer-to-peer approach to vehicular communication for the support of traffic safety applications

Abstract: More than half a million casualties are due to traffic accidents each year. Therefore, there is a high demand for innovative technologies focused on collision warning and collision avoidance. Among such technologies, the inter-vehicle communication and the vehicle-to-road communication are considered to have extensive potential for supporting the safety systems located within a vehicle. In this paper we propose a new approach to vehicular communication. We designed a safety-oriented vehicular communication, built around the concept of mobile ad-hoc peer-to-peer (P2P) networking. The merging between ad-hoc connectivity and P2P paradigm facilitates the development of a vehicular network characterized by self-organization, fault-tolerance, scalability, shareable resources and services, cooperation, cases of interconnection and cost efficiency. These characteristics recommend the communication proposed here as an efficient method for providing safety-relevant data for safety systems installed in vehicles.

Inter-vehicle communications and their applications to intelligent vehicles: an overview

Abstract: This paper surveys the inter-vehicle communications and the applications to intelligent vehicles. The inter-vehicle communications, defined here as communications among vehicles for ITS applications, are featured by that it can extend the horizon of drivers and on-board sensors. Systems with the inter-vehicle communications are, thus, much beneficial on the road traffic safety and efficiency. One of the earliest studies on the inter-vehicle communications was started in Japan in the early 1980s. In the recent automated platooning and cooperative driving systems, the inter-vehicle communications play an essential role, because they enable vehicles to obtain data difficult or impossible to measure with on-board sensors. The media used in the inter-vehicle communications include infrared, micro wave and millimeter wave, and various kinds of protocol are employed for the experiments. At present there are many technological and non-technological issues for practical use.

Geocast enhancements of AODV for vehicular networks

Abstract: Because of its reactive nature, AODV can handle the highly-dynamic behavior of vehicular Ad-Hoc networks relatively efficiently. However, in addition to link status information, a lot of other information is available within cars, e.g. information about speed and location as well as digital maps. The realization of some of the envisioned application scenarios depends on the additional usage of this information. In this paper, we motivate the usage of GPS- and vehicle velocity data for geocast applications in the vehicular environment. We also describe the prototype that we are developing based on NIST-AODV [4].

Incident-aware vehicular sensors for intelligent transportation systems

Abstract: A system and method for mobile platform real-time collection, transmission, and processing of an array of environmental and vehicle-related data in the context of an Intelligent Transportation System (ITS) network. The system and method provide enhanced in-vehicle data collection, enhanced communications capability between the vehicle and the ITS system, and enhanced ITS implementation functionality to provide real-time incident reporting to ITS users.

A hybrid communication architecture for intelligent shared vehicle systems

Abstract: There has been a large degree of activity in the communications arena of intelligent transportation systems. Various communication linkages are being developed for a variety of ITS applications for different purposes. Shared vehicle systems, as a relatively new transportation paradigm, are very well suited for the application of ITS technology, including advanced communication techniques. In general, a shared vehicle system typically consists of a fleet of vehicles that are used several times each day by different users. They offer the convenience of the private automobile and more flexibility than public transportation alone. There are many potential advantages to shared vehicle systems, including improved transportation efficiency, lower transportation cost, an energy/emission benefit, and increased use of existing transit systems. In this paper, we focus on the application of wireless communications to shared vehicle systems. In particular, we describe the design and development of a unique hybrid data communication architecture for a multiple-station shared vehicle system. This hybrid architecture is composed of vehicle-to-system communications using both DSRC (Dedicated Short Range Communications) and CDPD (Cellular Digital Packet Data) methods. Based on the communication needs within a multiple-station shared vehicle system, the hybrid communication system has been designed and optimized in terms of data packet loss, message latency, and system cost. Several experiments have been carried out, examining these measures of performance.

A novel architecture for supporting vehicular communication

Abstract: In today's world, traffic safety is a major problem. Traffic accidents result in more than half a million casualties each year and are associated with serious injuries and extensive material losses. Therefore, special attention is given to those technologies that can reduce the number and severity of road events. Inter-vehicle communication (IVC) and vehicle to road communication (VRC) are considered to have extensive potential for the development of efficient safety systems installed in vehicles. This paper proposes a novel, safety-oriented communication platform dedicated to supporting the exchange of safety-relevant information between traffic participants. The vehicular communication platform (VCP) aims to support a specific vehicular communication mechanism previously designed by the authors and briefly presented in the paper.

Multipath fading due to road surface reflection and fading reduction by means of space diversity in ITS vehicle‐to‐vehicle communications at 60 Ghz

Abstract: In the ITS (Intelligent Transport System), vehicle-to-vehicle communication to exchange information between vehicles and vehicle-to-road communication connecting vehicles and fixed network systems are important. The use of millimeter waves for vehicle-to-vehicle communication is being discussed. In this paper, in connection with vehicle-to-vehicle communication using millimeter waves, fundamental studies of fading due to road surface reflection, which is considered the most severe cause of degradation of radio wave propagation, are carried out. In addition, a quantitative evaluation of the effect of space diversity as a countermeasure for degradation of propagation is performed. © 2001 Scripta Technica, Electron Comm Jpn Pt 1, 85(1): 35–42, 2002

Vehicle to vehicle communication based convoy driving and potential applications of GPS

Abstract: Traffic congestion is forecasted to continue growing Simply building more roads is believed not a solution Many studies have been made to investigate the application of convoy driving or automated highway system (AHS) to release increasingly congested motorway, smooth motorway traffic flow, reduce journey time and increase road capacity The paper includes the introduction of a convoy driving system, discussions on potential impacts of the convoy driving system and the possibility of using differential GPS system (DGPS) for accurate vehicle locating in convoy driving systems

Introducing intelligent transportation systems: paradigm for 21st century transportation

Abstract: Intelligent transportation systems (ITS) offer the opportunity to integrate the transportation system through advanced traffic management systems, advanced traveler information systems, advanced vehicle control and safety systems, and other applications. Advocating "system thinking," the author outlines promising directions for ITS research and development, which should proceed in tandem with deployment and operations.

California path : partners for advanced transit and highways

Abstract: This article describes the recent efforts of California PATH (California Partners for Advanced Transit and Highways) in improving transportation efficiency on California highways. Explained in detail are PATH's attempts at creating and testing intelligent transportation, their proposals for changes in current transportation, potential mechanisms for relaying traffic information to drivers, and other such efforts that demonstrate the nature of the group's interest in modern transportation.

Internet its project (verification test)

Abstract: This paper discusses the verification of the Internet Intelligent Transportation Systems (ITS) project. It covers dedicated short range communications, local area networks (LAN) and content providers Global Positioning System (GPS) links, and road maps.