Monitoring Timed Properties (Revisited)

Abstract: In this paper we revisit monitoring real-time systems with respect to properties expressed either in Metric Interval Temporal Logic or as Timed B\"uchi Automata. We offer efficient symbolic online monitoring algorithms in a number of settings, exploiting so-called zones well-known from efficient model checking of Timed Automata. The settings considered include new, much simplified treatment of time divergence, monitoring under timing uncertainty, and extension of monitoring to offer minimum time estimates before conclusive verdicts can be made.