A Proposal of Payment System for Public Transport based on Ubiquitous Paradigm

Automatic payment systems (APS) play an important role in the productive activity of the passengers transport companies. The companies using APSs profit from an improved security and commercial speed and their clients from a reduction in the trip cost. We describe how to apply the ubiquitous paradigm in order to improve APSs and present an APS model that allow clients to use different mobile devices such as contactless smart cards, cellular phones or PDAs as means of payment. The system has the necessary mechanisms to be used in a combined way in different services contexts (public transport, parking, museums, etc). Suitable aspects of the system are the flexibility to implement different payment schemes, and the scalability to incorporate new mobile devices as means of payment. These characteristics are consequences of the system architecture, based on two main generic elements: the mobile device model and the user application model.