Summary of IOT Publications
| Title | The Computerized Traffic Signal Control Systems － The Communication System Handbook and the Communication Protocol: Planning Report |
|---|---|
| Dept | IOT |
| Year | 1997 |
| Summary | Owing to current technology progress and changing situation, our existing communication protocol of computerized traffic signal control system needs to be updated. On the other hand, our traffic signal professionals have been in lack of a handy communication system handbook for their uses and references for a long time. These understandings initiate this project. The content of the handbook comprises communication system framework, communication materials, communication functions, communication characteristics, system planning methods, communication quality, data transmission, etc. It includes all the aspects for relevant communication theories and technologies, employs in-depth traffic control system concepts, and interprets important ideas with a simple and easy way. As to the update of the existing protocol, the research taskforce is focusing on issues induced from the 1988 version of communication protocol released by the Ministry of Transportation and Communications, taking into account future functional demand of the Intelligent Transportation System, as well as current development of the National Transportation Communication for ITS Protocol of America (NTCIP), and constructing a new communication structure based on the reference model of Open System Interconnection (OSI). On the aspect of lower layer protocol, the international communication standards, for example, High-Level Data Link Control (HDLC), User Datagram Protocol/Transmission Control Protocol/Internet Protocol (UDP/TCP/IP), etc., are introduced except for the provision of a compatible model with the exiting protocol. For the application layer of implementing traffic control functions, a new system component of regional (master) controller is added to construct a revolutionary distributed control framework, and the existing centralized control structure is also taken into account to match the current international development trend. Another prototype protocol of data transmission between two control centers is then provided for future applications. Besides, the traffic control functions which are embedded in the revised protocol are graded for the purpose of effective selection of those local traffic authorities according to their individual control network size and budget constraints. Finally, a testing software is designed to engage in a simulation evaluation for certain selected new protocols to investigate the feasibility and reliability of the new version of communication protocol. |
| Post date | 1997-10-01 |