Methods for Applying Public Communication Lines to Communication-based Train Control Systems

Abstract

A method for applying public communication lines to communication-based train control systems is proposed. Applying public communication lines to train control systems differs from when applying them to conventional systems in that transmission lines which cannot be controlled by railway operators, intervene between safety devices. Therefore, this paper presents a configuration where train control function and information transmission are independent of each other in order to build a system which meets safety critical requirements without depending on transmission lines. This paper also presents threats posed by information transmission functions from the perspective of the train control function and countermeasure requirements, as well as implementation methods which meet these requirements using current techniques.