Nicolas Markey

Résumé

We consider the model of priced (a.k.a. weighted) timed automata, an extension of timed automata with cost information on both locations and transitions. We prove that model-checking this class of models against the logic WCTL, CTL with cost-constrained modalities, is PSPACE-complete under the "single-clock" assumption. In contrast, it has been recently proved that the model-checking problem is undecidable for this model as soon as the system has three clocks. We also prove that the model-checking of WCTL becomes undecidable, even under this "single-clock" assumption.

@inproceedings{fossacs2007-BLM,
  author =              {Bouyer, Patricia and Larsen, Kim Guldstrand and
                         Markey, Nicolas},
  title =               {Model Checking One-clock Priced Timed Automata},
  editor =              {Seidl, Helmut},
  booktitle =           {{P}roceedings of the 10th {I}nternational
                         {C}onference on {F}oundations of {S}oftware
                         {S}cience and {C}omputation {S}tructure
                         ({FoSSaCS}'07)},
  acronym =             {{FoSSaCS}'07},
  publisher =           {Springer-Verlag},
  series =              {Lecture Notes in Computer Science},
  volume =              {4423},
  pages =               {108-122},
  year =                {2007},
  month =               mar,
  doi =                 {10.1007/978-3-540-71389-0_9},
  abstract =            {We consider the model of priced (a.k.a.~weighted)
                         timed automata, an extension of timed automata with
                         cost information on both locations and transitions.
                         We prove that model-checking this class of models
                         against the logic~WCTL, CTL~with cost-constrained
                         modalities, is PSPACE-complete under the
                         {"}single-clock{"} assumption. In~contrast, it~has
                         been recently proved that the model-checking problem
                         is undecidable for this model as soon as the system
                         has three clocks. We also prove that the
                         model-checking of~WCTL becomes undecidable, even
                         under this {"}single-clock{"} assumption.},
}