Cooperative systems in transportation can bring new intelligence for vehicles, roadside systems, operators and individuals by creating a communications platform allowing vehicles and infrastructure to share information. The performance of this underlying communication system has a major impact on the effectiveness of the emerging applications for intelligent transportation systems. Similarly, the approach taken to the dissemination of relevant information throughout the vehicular setting is influenced by the network performance characteristics. This paper investigates the concept of data dissemination in a heterogeneous vehicular wireless environment. A communications architecture which consists of infrastructure based transmission for cooperative vehicular systems is described. Following this, a simple, policy-based solution to establish how best to disseminate the data for an envisaged ITS application is presented. This policy considers the application requirements and the quality of the wireless carrier in determining how the information can be propagated to the relevant recipients in the most effective and efficient manner.
The concept of Intelligent Transportation Systems (ITS) presents new R&D challenges in the transportation and ICT sectors and is currently receiving considerable interest from the research community. The primary objective of ITS is the creation of advanced road traffic systems for improved traffic safety, efficiency, and travelling comfort. Applications such as trip planning, automatic tolling and emergency warnings, among others, are envisaged in a system which can potentially reform modern transportation. Basic vehicle and roadside infrastructure collaboration allows an increase in efficiency and safety and acts as a foundation for an extensive application set to achieve these ITS goals. The use of software tools to simulate the behaviour of a network, and then analysing the effect of various parameters on the network performance, is a crucial task for these new technologies' application development and implementation. Currently, since neither infrastructure nor communications capabilities exist in vehicles beyond small scale prototypes, computer simulation is the only viable option in evaluation of potential ITS solutions. This paper presents CALMnet a comprehensive network-centric simulation environment for CALM-based cooperative vehicular systems. Using the OPNET modeler simulation tool, a number of elements necessary for accurate emulation of the complex cooperative vehicular network are identified and addressed. Important areas of consideration include vehicle mobility, communications channel behaviour, application design sets and RSU and OBU device modelling to accurately simulate the envisaged ITS concept.
With the increasing demand for traffic safety and efficiency and constant search for innovative solutions within the automotive market coupled with supporting initiatives from regulatory (governmental) domains, the potential of Intelligent Transportation Systems (ITS) is vast. Basic vehicle and roadside infrastructure collaboration allows an increase in efficiency and safety and acts as the foundation for an extensive application set to achieve the ITS goals of cleaner, safer and more efficient travel. There are some important considerations however. Taking into account the wide array of communication technologies and plethora of proposed applications, this paper aims to address one of the major and largely unexplored challenges facing the ITS research community in relation to service and communication management (SCM), whereby the underlying communications capability is sufficiently exploited to assure satisfactory operation of deployed ITS applications. Such functionality is integral in ensuring the successful dissemination of relevant information throughout the vehicular network, contributing to the overall success and acceptance of the ITS hypothesis. On examination of the state of the art, a foundational architecture for service and communication management in cooperative vehicular systems is presented. Using this proposed framework, a diverse mix of approaches for SCM are examined using CALMnet, a networkcentric ITS simulation environment, highlighting the effect of different techniques on system performance and user satisfaction.
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