Scarlet Schwiderski-Grosche
ABSTRACT
In mobile systems, the requirements on composite event detection are fundamentally different from those in distributed systems. Composite event detection must be driven not just by the time of occurrence of an event, but also by its location of occurrence; composite event detection, as applied in traditional distributed event-based systems, needs to be reassessed. In this paper, we motivate the need to support spatio-temporal relations between composite events in mobile systems and introduce SpaTeC, a composite event language that enables simultaneous matching of event occurrences over space and time. Composite event operators provide for coarse spatio-temporal reasoning. Spatial and temporal restrictions constrain composite event detection in space and time and provide a basis for event filtering and spatio-temporal routing. Time and location stamps use a guaranteed bounds model for location estimation and time synchronization. The semantics of SpaTeC event operators is defined within this framework.
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Index Terms
- The SpaTeC composite event language for spatio-temporal reasoning in mobile systems
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Reviews
Dana Petcu
Schwiderski-Grosche and Moody propose SpaTeC, a composite event language for spatio-temporal reasoning in mobile systems. They also provide a semantics based on the "guaranteed bounds model for local estimation and time synchronization." In order to support spatio-temporal relations between composite events in mobile systems, SpaTeC "enables simultaneous matching of event occurrences over space and time." The paper includes a well-written overview of composite event detection in traditional distributed event-based systems. It also provides details on the guaranteed model for time synchronization and localization in sensor networks. Although SpaTeC is particularly useful to mobile sensor networks, "the results are applicable to all systems requiring a spatio-temporal model of events, whether fixed or mobile." Online Computing Reviews Service
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