Roadside Network Communication for Traffic Control
Masafumi Kobayashi, Masatada Seto, T Tajima · 12th World Congress on Intelligent Transport SystemsITS AmericaITS JapanERTICO · 2005
UD-type communication is a communication standard between center and roadside devices for traffic control in Japan. It adopts DATEX/ASN that is contention method for the application layer and UDP/IP for the lower layer. The main objective of UD type communication is to put together the logical channels between center and roadside devices in one physical communication line. The important characteristic of UD-type communication is that it is suitable to the direct communication between the roadside devices. It has some advantages compared to the case that the center collects and disseminates all kinds of information. UTMS (Universal Traffic Management Society of Japan) society sets up the working group to study the applications of the direct communication between roadside devices and make the standard. This paper reports the outline of UD-type communication, the application example and the communication standard.