International Conference on Formal Modeling and Analysis of Timed Systems

FORMATS 2015: Formal Modeling and Analysis of Timed Systems pp 189-205 | Cite as

Nested Timed Automata with Frozen Clocks

Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 9268)


A nested timed automaton (NeTA) is a pushdown system whose control locations and stack alphabet are timed automata (TAs). A control location describes a working TA, and the stack presents a pile of interrupted TAs. In NeTAs, all local clocks of TAs proceed uniformly also in the stack. This paper extends NeTAs with frozen local clocks (NeTA-Fs). All clocks of a TA in the stack can be either frozen or proceeding when it is pushed. A NeTA-F also allows global clocks adding to local clocks in the working TA, which can be referred and/or updated from the working TA. We investigate the reachability of NeTA-Fs showing that (1) the reachability with a single global clock is decidable, and (2) the reachability with multiple global clocks is undecidable.


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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.BASICS, School of SoftwareShanghai Jiao Tong UniversityShanghaiChina
  2. 2.Japan Advanced Institute of Science and TechnologyNomiJapan
  3. 3.Graduate School of Information ScienceNagoya UniversityNagoyaJapan

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