By Ricardo Couto Antunes da Rocha

Research in context-aware computing has produced a couple of middleware platforms for context administration. even though, improvement of ubiquitous context-aware purposes continues to be a problem simply because most modern middleware structures are nonetheless excited by remoted and static context-aware environments. Context-aware environments are inherently dynamic because of occasional additions or improve of sensors, functions or context inference mechanisms.

Context administration for dispensed and Dynamic Context-Aware Computing proposes a unique structure for context administration in keeping with the concept that of context domain names, permitting functions to maintain context pursuits throughout dispensed context administration platforms. The authors describe a allotted middleware that implements the aforementioned recommendations, with out compromising scalability and potency of context access.

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For example, if a device enters in a physical environment that provides location sensors, than any context consumer interested in the device’s location must have its interests also registered in the corresponding CMS. 2 Example of context location providers (sensors) and the placement of their CMS Provider CMS Location Applicability GPS E911 ActiveBadges Locally placed Cellular network Building infrastructure Outdoor Indoor/Outdoor Indoor Dynamic Deployment of Context Types As the result of the introduction of new sensors, the context model may also need to conform to particularities of the new provided context information.

To analyse how middleware systems support dynamic context-aware ecosystem, the chapter presented an analysis of how they support 38 3 State of the Art Fig. 5 Architecture of bridging approaches context interest of variable wideness. As a conclusion of the chapter, there is no middleware system that support interest expression of types Do , Dr , and Dc . In respect to the aspect of type coverage, some middleware systems support expressions Ta and Ts , since it depends on the context model adopted by the middleware.

In this scenario, a tourist uses a location-aware application to plan an itinerary in a city, which involves roaming through different context domains. 0 example, described in Chap. 2. 3 presents a scenario of the application usage by a tourist in the city of Rio de Janeiro. e. context domains, providers and models) described in Sect. 4. 5 presents the context interests required for the application. Finally, Sect. 6 discusses the benefits of using context interests in the proposed scenario, based on the concept of domains, in terms of an optimized number of overall notifications sent to the application.

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