By Topic

Context aggregation and dissemination in ubiquitous computing systems

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Guanling Chen ; Dartmouth Coll., Hanover, NH, USA ; Kotz, D.

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, then 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. We motivate and describe our graph abstraction, and discuss a variety of critical design issues. We also sketch our Solar system, an implementation that represents one point in the design space for our graph abstraction, and present the specific choices made by Solar and how its future evolution will be guided by the design discussion.

Published in:

Mobile Computing Systems and Applications, 2002. Proceedings Fourth IEEE Workshop on

Date of Conference: