PERFORMANCE VERIFICATION OF NETWORK-BASED PROTOCOL FOR RAILWAY SIGNALING SYSTEMS

초록

According to the computerization of railway signaling systems, the interface link between the signaling systems has been replaced by the digital communication channel. At the same time, the importance of the communication link is more pronounced than in the past. In this paper, network-based communication protocol for Korean railway signaling has designed between CTC (Centralized Traffic Control) and SCADA (Supervisory Control and Data Acquisition) system, and the overview of designed protocol is briefly represented. And also this paper addresses an analysis of newly designed railway signaling systems. Using the informal method for specifying the communication protocol, a little ambiguity may be contained in the protocol. To clear the ambiguity contained in the designed protocol, we use LTS (Labeled Transition System) model to design the protocol for this interface link between CTC and SCADA, the LTS is an intermediate model for encoding the operational behavior of processes. And then, we verify formally the safety and the liveness properties through the model checking method. It will be expected to increase the safety, reliability and efficiency of maintenance of the signaling systems by using the designed protocol for railway signaling in Korea.