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Context-consistency checking is challenging in the dynamic and uncertainubiquitous computing environments. This is because contexts are often noisyowing to unreliable sensing data streams, inaccurate data measurement, fragileconnectivity and resource constraints. One of the state-of-the-art efforts isCEDA, which concurrently detects context consistency by exploring the\emph{happened-before} relation among events. However, CEDA is seriouslylimited by several side effects --- centralized detection manner that easilygets down the checker process, heavy computing complexity and false negative.  In this paper, we propose SECA: Snapshot-based Event Detection for CheckingAsynchronous Context Consistency in ubiquitous computing. SECA introducessnapshot-based timestamp to check event relations, which can detect scenarioswhere CEDA fails. Moreover, it simplifies the logical clock instead of adoptingthe vector clock, and thus significantly reduces both time and spacecomplexity. Empirical studies show that SECA outperforms CEDA in terms ofdetection accuracy, scalability, and computing complexity.

SECA: Snapshot-based Event Detection for Checking Asynchronous Context Consistency in Ubiquitous Computing