Symbolic Robustness Analysis of Timed Automata

  • Conrado Daws
  • Piotr Kordy
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4202)


We propose a symbolic algorithm for the analysis of the robustness of timed automata, that is the correctness of the model in presence of small drifts on the clocks or imprecision in testing guards. This problem is known to be decidable with an algorithm based on detecting strongly connected components on the region graph, which, for complexity reasons, is not effective in practice.

Our symbolic algorithm is based on the standard algorithm for symbolic reachability analysis using zones to represent symbolic states and can then be easily integrated within tools for the verification of timed automata models. It relies on the computation of the stable zone of each cycle in a timed automaton. The stable zone is the largest set of states that can reach and be reached from itself through the cycle. To compute the robust reachable set, each stable zone that intersects the set of explored states has to be added to the set of states to be explored.


Reachable State Stable Zone Symbolic State Region Graph Unsafe State 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Conrado Daws
    • 1
    • 2
  • Piotr Kordy
    • 2
  1. 1.Department of Applied Mathematics 
  2. 2.Formal Methods Group, Faculty of Electrical Engineering, Mathematics and Computer ScienceUniversity of TwenteThe Netherlands

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