Compositional Abstraction in Real-Time Model Checking

J. Berendsen and F.W. Vaandrager. Compositional Abstraction in Real-Time Model Checking. To appear in Proceedings FORMATS'08, Saint-Malo, France, September 15-17, 2008. Full version available as Technical Report ICIS-R07027, ICIS, Radboud University Nijmegen, November 2007.


The idea to use simulations (or refinements) as a compositional abstraction device is well-known, both in untimed and timed settings, and has already been studied theoretically and practically in many papers during the last three decades. Nevertheless, existing approaches do not handle two fundamental modeling concepts which, for instance, are frequently used in the popular Uppaal model checker: (1) a parallel composition operator that supports communication via shared variables as well as synchronization of actions, and (2) committed locations. In this paper, we describe a framework for compositional abstraction based on simulation relations that does support both concepts, and that is suitable for Uppaal. Our approach is very general and the only essential restriction is that the guards of input transitions do not depend on external variables. We have applied our compositional framework to verify the Zeroconf protocol for an arbitrary number of hosts.

FORMATS'08 version (pdf)
Full version (pdf)
some slides (pdf)
Note explaining why parallel composition is not associative in FTRTFT2000 paper by Jensen, Larsen & Skou
Parallel composition in a paper by De Alfaro e.a. is not associative,,