On contextcast: a context-aware communication mechanism

Authors:
Lars Geiger;Frank Dürr;Kurt Rothermel
Affiliations:
Institute of Parallel and Distributed Systems, Universität Stuttgart, Stuttgart, Germany;Institute of Parallel and Distributed Systems, Universität Stuttgart, Stuttgart, Germany;Institute of Parallel and Distributed Systems, Universität Stuttgart, Stuttgart, Germany
Venue:
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Year:
2009

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Abstract

The dissemination of messages according to clients' contexts (i.e., location and other attributes) opens up new possibilities in context-aware systems. While geocast or content-based publish/subscribe forward messages according to client location or attributes, respectively, neither uses a combination of the two. In this paper, we present this new communication paradigm and the challenges it poses. We also extend concepts from publish/subscribe networks to efficiently deal with highly dynamic user location to lower update rates by approximating the user's location. This reduces update rates by between 25% and 90%, depending on the granularity of the approximation.