Toward formal description to metro services mechanism based on bigraph models

The modern public traffic system provides more intelligence and efficiency services. These great requirements leading the complex services systems, such as the automatic fare collection in the urban rail transit system to convenient to passengers. In this paper, a novel method in a formal way is proposed to model and analyze the metro services mechanism by building bigraph models with a set of reactive rules, from the view point of the passenger. Different from traditional modeling methods, in these bigraph models, human beings are taken as a part of the system and the discussion is focused on the interactions between the human beings and the devices.