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International Symposium on Leveraging Applications of Formal Methods

ISoLA 2020: Leveraging Applications of Formal Methods, Verification and Validation: Engineering Principles pp 55–71Cite as

Parametric Timed Bisimulation

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Part of the book series: Lecture Notes in Computer Science ((LNTCS,volume 12477))

Abstract

Timed automata (TA) constitute a mature formalism for discrete-state/continuous-time behavior of time-critical cyber-physical systems. Concerning the fundamental analysis problem of comparing a candidate implementation against a specification both given as TA, it has been shown that timed trace equivalence is undecidable, whereas timed bisimulation is decidable. However, the limited expressiveness of TA is a serious obstacle in practice such that many TA extensions have been proposed. For instance, parametric timed automata (PTA) incorporate parametric clock constraints with freely-adjustable time intervals thus generalizing the constant time bounds of TA. In this way, PTA constitute a promising theoretical foundation for re-engineering static real-time specifications, originally given as TA, in a generic and customizable way. In this paper, we provide, to the best of our knowledge, the first proposal for lifting the notion of timed bisimulation from TA to PTA. Unfortunately, as PTA are Turing-complete, most interesting semantic properties being decidable for TA (including timed bisimulation), become undecidable for PTA. To tackle this issue, we propose an over-approximation of PTA semantics in terms of plain TA semantics and investigate decidability properties of a promising sub-class of PTA, called L/U-PTA.

L. Luthmann—This work was funded by the Hessian LOEWE initiative within the Software-Factory 4.0 project.

H. Göttmann—This work has been funded by the German Research Foundation (DFG) as part of project A4 within the Collaborative Research Center (CRC) 1053 MAKI.

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Authors and Affiliations

  1. Model-Based Engineering Group, University of Siegen, Siegen, Germany

    Malte Lochau

  2. Real-Time Systems Lab, Technical University of Darmstadt, Darmstadt, Germany

    Lars Luthmann, Hendrik Göttmann & Isabelle Bacher

Authors
  1. Malte Lochau
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  2. Lars Luthmann
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  3. Hendrik Göttmann
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  4. Isabelle Bacher
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Corresponding authors

Correspondence to Malte Lochau , Lars Luthmann , Hendrik Göttmann or Isabelle Bacher .

Editor information

Editors and Affiliations

  1. University of Limerick and Lero, Limerick, Ireland

    Tiziana Margaria

  2. TU Dortmund, Dortmund, Germany

    Bernhard Steffen

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Lochau, M., Luthmann, L., Göttmann, H., Bacher, I. (2020). Parametric Timed Bisimulation. In: Margaria, T., Steffen, B. (eds) Leveraging Applications of Formal Methods, Verification and Validation: Engineering Principles. ISoLA 2020. Lecture Notes in Computer Science(), vol 12477. Springer, Cham. https://doi.org/10.1007/978-3-030-61470-6_5

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  • DOI: https://doi.org/10.1007/978-3-030-61470-6_5

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  • Online ISBN: 978-3-030-61470-6

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