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CONCUR
2008
Springer

Distributed Timed Automata with Independently Evolving Clocks

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Distributed Timed Automata with Independently Evolving Clocks
Abstract. We propose a model of distributed timed systems where each component is a timed automaton with a set of local clocks that evolve at a rate independent of the clocks of the other components. A clock can be read by any component in the system, but it can only be reset by the automaton it belongs to. There are two natural semantics for such systems. The universal semantics captures behaviors that hold under any choice of clock rates for the individual components. This is a natural choice when checking that a system always satisfies a positive specification. However, to check if a system avoids a negative specification, it is better to use the existential semantics--the set of behaviors that the system can possibly exhibit under some choice of clock rates. We show that the existential semantics always describes a regular set of behaviors. However, in the case of universal semantics, checking emptiness turns out to be undecidable. As an alternative to the universal semantics, we p...
S. Akshay, Benedikt Bollig, Paul Gastin, Madhavan
Added 18 Oct 2010
Updated 18 Oct 2010
Type Conference
Year 2008
Where CONCUR
Authors S. Akshay, Benedikt Bollig, Paul Gastin, Madhavan Mukund, K. Narayan Kumar
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