Reachability of Communicating Timed Processes

  • Lorenzo Clemente
  • Frédéric Herbreteau
  • Amelie Stainer
  • Grégoire Sutre
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7794)


We study the reachability problem for communicating timed processes, both in discrete and dense time. Our model comprises automata with local timing constraints communicating over unbounded FIFO channels. Each automaton can only access its set of local clocks; all clocks evolve at the same rate. Our main contribution is a complete characterization of decidable and undecidable communication topologies, for both discrete and dense time. We also obtain complexity results, by showing that communicating timed processes are at least as hard as Petri nets; in the discrete time, we also show equivalence with Petri nets. Our results follow from mutual topology-preserving reductions between timed automata and (untimed) counter automata. To account for urgency of receptions, we also investigate the case where processes can test emptiness of channels.


Label Transition System Delay Action Dense Time Testable Channel Star Topology 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Lorenzo Clemente
    • 1
  • Frédéric Herbreteau
    • 1
  • Amelie Stainer
    • 2
  • Grégoire Sutre
    • 1
  1. 1.CNRS, LaBRI, UMR 5800Univ. BordeauxTalenceFrance
  2. 2.University of Rennes 1RennesFrance

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