Mobile Synchronizing Petri Nets: A Choreographic Approach for Coordination in Ubiquitous Systems

  • Authors:

  • Fernando Rosa-Velardo;Olga Marroquín-Alonso;David de Frutos-Escrig

  • Affiliations:

  • Departamento de Sistemas Informáticos y Programación, Universidad Complutense de Madrid, Spain;Departamento de Sistemas Informáticos y Programación, Universidad Complutense de Madrid, Spain;Departamento de Sistemas Informáticos y Programación, Universidad Complutense de Madrid, Spain

  • Venue:
  • Electronic Notes in Theoretical Computer Science (ENTCS)
  • Year:
  • 2006

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Abstract

The term Ubiquitous Computing was coined by Mark Weiser almost two decades ago. Despite all the time that has passed since Weiser's vision, ubiquitous computing still has a long way ahead to become a pervasive reality. One of the reasons for this may be the lack of widely accepted formal models capable of capturing and analyzing the complexity of the new paradigm. We propose a simple Petri Net based model to study some of its main characteristics. We model both devices and software components as a special kind of coloured Petri Nets, located in locations, that can move to other locations and synchronize with other co-located nets, offering and requesting services. We obtain an amenable model for ubiquitous computing, due to its graphical representation. We present our proposal in a progressive way, first presenting a basic model where coordination is formalized by the synchronized firing of pairs of compatible transitions that offer and request a specific service, and ad hoc networks are modeled by constraining mobility by the dynamic acquisition of locality names. Next, we introduce a mechanism for the treatment of robust security properties, namely the generation of fresh private names, to be used for authentication properties.