Context Aggregation and Dissemination in Ubiquitous Computing Systems
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 2002
- Accession Number
- ADA440675
Entities
People
- David Kotz
- Guanling Chen
Organizations
- Dartmouth College