Algorithms for omega-regular games with imperfect information Conference Paper


Author(s): Chatterjee, Krishnendu; Doyen, Laurent; Henzinger, Thomas A; Raskin, Jean-François
Title: Algorithms for omega-regular games with imperfect information
Title Series: LNCS
Affiliation
Abstract: We study observation-based strategies for two-player turn-based games on graphs with omega-regular objectives. An observation-based strategy relies on imperfect information about the history of a play, namely, on the past sequence of observations. Such games occur in the synthesis of a controller that does not see the private state of the plant. Our main results are twofold. First, we give a fixed-point algorithm for computing the set of states from which a player can win with a deterministic observation-based strategy for any omega-regular objective. The fixed point is computed in the lattice of antichains of state sets. This algorithm has the advantages of being directed by the objective and of avoiding an explicit subset construction on the game graph. Second, we give an algorithm for computing the set of states from which a player can win with probability 1 with a randomized observation-based strategy for a Buchi objective. This set is of interest because in the absence of perfect information, randomized strategies are more powerful than deterministic ones. We show that our algorithms are optimal by proving matching lower bounds.
Conference Title: CSL: Computer Science Logic
Volume: 4207
Conference Dates: September 25-29, 2006
Conference Location: Szeged, Hungary
ISBN: 3-540-45458-6
Publisher: Springer  
Location: Berlin, Heidelberg
Date Published: 2006-11-13
Start Page: 287
End Page: 302
Sponsor: This research was supported in part by the NSF grants CCR-0225610 and CCR-0234690, by the SNSF under the Indo-Swiss Joint Research Programme, and by the FRFC project “Centre Fédéré en Vérification” funded by the FNRS under grant 2.4530.02.
DOI: 10.1007/11874683_19
Open access: no
IST Austria Authors
  1. Thomas A. Henzinger
    415 Henzinger
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