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Context Shadow A Person-Centric Infrastructure for Context Aware Computing
Context Shadow: A Person-Centric Infrastructure
for Context Aware Computing
Martin Jonsson
The FUSE Research Group, KTH Center for Wireless Systems, KTH
DSV, Electrum 230, SE-164 40 Kista, Sweden
martinj@dsv.su.se
Abstract. In ubiquitous computing environments, hardware and software ser-
vices will create huge and ubiquitous service spaces. These service spaces will
need to be organized in meaningful ways so that the services can be easily ac-
cessed and utilized by other services and humans. Context Shadow is a system
that makes it possible for services to ask questions about a person’s current
context, and specifically about what services that are relevant to that context. In
the system, sensors and services are organized in meaningful collections, creat-
ing a searchable topology of context information.
1 Introduction
Providing information about the users context to applications is potentially very useful
in several ways. The behavior of an application can be adapted to make the interaction
more efficient or to increase the ease of use. You can also imagine entirely new types
of applications that are designed specifically to make use of some certain context
information. Under the notion of context aware computing there have been several
attempts both to define what context really is, and how to design applications that use
it [1-2].
In this paper context aware computing will be viewed from a ubiquitous- or disap-
pearing computing perspective [3]. The assumption we make is that our everyday
environments will become increasingly more readable and controllable. This is due to
the ability to embed computers into everyday objects, and to connect them to the
Internet. We also see an increasing use of personal mobile computing artifacts. These
new stationary and mobile artifacts will provide different kinds of services either to a
user directly or it will be accessible to other software services over the Internet. This
will result in a pote
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