Traffic Information Transmission through Short Range Wireless Communication Technology for Enroute Vehicles
Date Issued
2008
Date
2008
Author(s)
Ye, Hong Seng
Abstract
Many convenient on-line Advanced Traveler Information Systems (ATIS) have been developed by government so far. However, the usages of these systems are limited to the access of internet, and lacking in consistency of information. These deficiencies would debase its reliability and convenience. Therefore the main purpose of this research is to unify the standards applied among different traffic information systems, in order to ensure the consistency of information and improving the efficiency of resource utilization. Under the consideration of future development, the NTCIP protocol and the present road-vehicle communication technique of other advanced countries such as U.S.A., Japan, and countries in Europe, whose situations of development would be applied for the base of this research, to establish standards among roadside units and onboard units including protocol, parameters and their functions. Drawn from the progress in applications of communication technique between roadside infrastructure and vehicle on-board units abroad, the conclusion is that the information spread by these systems can be divided into three parts generally. The first is the information of traffic signs, signals and marks. The second is the announcement of emergent incident and the last one is the information of traffic condition. Therefore the regulation of signs, marks and signals for road traffic applied in Taiwan is adopted as reference to draw up TMIB. In addition, both of the service definitions for EMS users of ITS skeleton scheme 2004 and the principles of CMS messages display are referred as basis of this research. Among of the TMIB, the range over regulation of signs are very wide, and the data elements of this classification has high repetition, so for the objective of minimum size of packet, this research draw up a classification method, if we utilizing this method, it will reduce a lot of packet, and also lower the load of the whole internet. Moreover, in order to prevent the problem of recombination after segment of packet, a mechanism for ensuring the completeness of packet format in heterogeneous network was designed. Based on this framework, this research uses J2ME as programming language, building up a real-time traffic information interchange platform. Besides, not only the objective for information sharing among ATIS, vehicles on-board units and RSU can be accomplished, but it could also improve the traffic safety and the efficiency of information utilization. This platform includes three modules: the STMP encode module, the STMP decode module, and the judgment and display module. After constructing the interchange platform for the real-time traffic information, this research carries out a test and confirmation of laboratory stage. The test result(encode, decode, display) shows that 20 objects chosen from TMIB succeeded in this test. Moreover, a mechanism for ensuring the completeness of packet format in heterogeneous network was designed, and also has been verified successfully after several practical experiments between enroute vehicles and RSU.
Subjects
real-time traffic information
protocol
platform
Type
thesis
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