Establishment Phased-In Constructing Method for System Expansion of Tokyo Metropolitan Railway System

Autonomous decentralized system (ADS) architecture has been used to construct high assurance control systems like infrastructure systems. Such systems have to be expanded these functions to meet new demands of service. In that case, the method which can be used for the system expansion without any bad influence to the online systems is essential. In this paper, we clarify that a new system expansion method without any bad influence to the online systems. And we apply this method to a railway transport operation control system (ATOS) to expand the system.