DMCA
An Inverse Method for Parametric . . . (2009)
BibTeX
@MISC{André09aninverse,
author = {Étienne André and Thomas Chatain and Laurent Fribourg and Emmanuelle Encrenaz},
title = {An Inverse Method for Parametric . . . },
year = {2009}
}
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Abstract
We consider in this paper systems modeled by timed automata. The timing bounds involved in the action guards and location invariants of our timed automata are not constants, but parameters. Those parametric timed automata allow the modelling of various kinds of timed systems, e.g. communication protocols or asynchronous circuits. We will also assume that we are given an initial tuple π0 of values for the parameters, which corresponds to values for which the system is known to behave properly. Our goal is to compute a constraint K0 on the parameters, satisfied by π0, guaranteeing that, under any parameter valuation satisfying K0, the system behaves in the same manner: for any two parameter valuations satisfying K0, the behaviors of the timed automata are (time-abstract) equivalent, i.e., the traces of execution viewed as alternating sequences of actions and locations are identical. We present an algorithm InverseMethod that terminates in the case of acyclic models, and discuss how to extend it in the cyclic case. We also explain how to combine our method with classical synthesis methods which are based on the avoidance of a given set of bad states. A prototype implementation has been done, and various experiments are described.
Keyphrases
inverse method parameter valuation paper system initial tuple cyclic case action guard timed automaton various kind constraint k0 classical synthesis method bad state prototype implementation communication protocol location invariant timed system various experiment algorithm inversemethod asynchronous circuit acyclic model
