Context Aggregation and Dissemination in Ubiquitous Computing Systems

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Context Aggregation and Dissemination in Ubiquitous Computing Systems (2002)

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by Guanling Chen , David Kotz

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63 - 9 self

BibTeX

@MISC{Chen02contextaggregation,
    author = {Guanling Chen and David Kotz},
    title = {Context Aggregation and Dissemination in Ubiquitous Computing Systems},
    year = {2002}
}

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Abstract

Many "ubiquitous computing" applications need a constant flow of information about their environment to be able to adapt to their changing context. To support these "context-aware" applications we propose a graph-based abstraction for collecting, aggregating, and disseminating context information. The abstraction models context information as events, produced by sources and flowing through a directed acyclic graph of event-processing operators and delivered to subscribing applications. Applications describe their desired event stream as a tree of operators that aggregate low-level context information published by existing sources into the high-level context information needed by the application. The operator graph is thus the dynamic combination of all applications' subscription trees.

Keyphrases

context aggregation ubiquitous computing system context information high-level context information dynamic combination low-level context information subscription tree directed acyclic graph constant flow operator graph event-processing operator desired event stream context-aware application abstraction model context information graph-based abstraction

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