Computing accumulated delays in realtime systems
 Rajeev Alur,
 Costas Courcoubetis,
 Thomas A. Henzinger
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Abstract
We present a verification algorithm for duration properties of finitestate realtime systems. While simple realtime properties constrain the total elapsed time between events, duration properties constrain the accumulated time during which certain state predicates hold. We formalize the concept of durations by introducing duration measures for (densetime) timed automata. Given a timed automaton with a duration measure, a start and a target state, and a duration constraint, the durationbounded reachability problem asks if there is a run of the automaton from the start state to the target state such that the accumulated duration along the run satisfies the constraint. Our main result is a novel decision procedure for solving the durationbounded reachability problem. We also prove that the problem is PSPACEcomplete and demonstrate how the solution can be used to verify interesting duration properties of realtime systems.
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 Title
 Computing accumulated delays in realtime systems
 Book Title
 Computer Aided Verification
 Book Subtitle
 5th International Conference, CAV '93 Elounda, Greece, June 28–July 1, 1993 Proceedings
 Pages
 pp 181193
 Copyright
 1993
 DOI
 10.1007/3540569227_16
 Print ISBN
 9783540569220
 Online ISBN
 9783540477877
 Series Title
 Lecture Notes in Computer Science
 Series Volume
 697
 Series ISSN
 03029743
 Publisher
 Springer Berlin Heidelberg
 Copyright Holder
 SpringerVerlag
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 Editors
 Authors

 Rajeev Alur ^{(1)}
 Costas Courcoubetis ^{(2)}
 Thomas A. Henzinger ^{(3)}
 Author Affiliations

 1. AT&T Bell Laboratories, Murray Hill
 2. Department of Computer Science, University of Crete, Greece
 3. Department of Computer Science, Cornell University, Ithaca
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