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DOI: 10.4230/LIPIcs.CONCUR.2019.14
On the Complexity of Reachability in Parametric Markov Decision Processes

Authors: Tobias Winkler, Sebastian Junges, Guillermo A. Pérez, and Joost-Pieter Katoen

Published in: LIPIcs, Volume 140, 30th International Conference on Concurrency Theory (CONCUR 2019)

Abstract
This paper studies parametric Markov decision processes (pMDPs), an extension to Markov decision processes (MDPs) where transitions probabilities are described by polynomials over a finite set of parameters. Fixing values for all parameters yields MDPs. In particular, this paper studies the complexity of finding values for these parameters such that the induced MDP satisfies some reachability constraints. We discuss different variants depending on the comparison operator in the constraints and the domain of the parameter values. We improve all known lower bounds for this problem, and notably provide ETR-completeness results for distinct variants of this problem. Furthermore, we provide insights in the functions describing the induced reachability probabilities, and how pMDPs generalise concurrent stochastic reachability games.
Cite as

Tobias Winkler, Sebastian Junges, Guillermo A. Pérez, and Joost-Pieter Katoen. On the Complexity of Reachability in Parametric Markov Decision Processes. In 30th International Conference on Concurrency Theory (CONCUR 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 140, pp. 14:1-14:17, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{winkler_et_al:LIPIcs.CONCUR.2019.14,
  author =	{Winkler, Tobias and Junges, Sebastian and P\'{e}rez, Guillermo A. and Katoen, Joost-Pieter},
  title =	{{On the Complexity of Reachability in Parametric Markov Decision Processes}},
  booktitle =	{30th International Conference on Concurrency Theory (CONCUR 2019)},
  pages =	{14:1--14:17},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-121-4},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{140},
  editor =	{Fokkink, Wan and van Glabbeek, Rob},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2019.14},
  URN =		{urn:nbn:de:0030-drops-109162},
  doi =		{10.4230/LIPIcs.CONCUR.2019.14},
  annote =	{Keywords: Parametric Markov decision processes, Formal verification, ETR, Complexity}
}
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