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Communications in Intelligent Vehicle Highway Systems. Part I
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1991-11-01
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[PDF-3.46 MB]
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Edition:Interim - January 1990 thru August 1991
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Abstract:This report accesses the communications capacity of the traffic management systems being installed in Texas with a view to two-way communications between the traffic management centers and vehicles on the roadway. The study will investigate the general telecommunications requirements for information flow, both from and to vehicles and traffic centers. Various approaches to the communication problem have been studied in terms of data rates and bandwidth requirements, feasibility of implementation and the ability to incorporated future expansions. These approaches include the use of infra-red optical communications in a distributed environment, conventual spread spectrum radio, and the use of a dedicated frequency-band. This report only investigates those communication systems which offer the most promising methods for communicating between vehicles and a traffic management center. It does not consider, for example, the distribution using a fiber-optic network installed under major highways. The capacity requirements of such a network are not covered in this report. The emphasis is on digital systems that offer unique advantages over analog systems, including the ability to integrate with existing data networks such as the telephone network.
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