ISSN : 1796-217X
Volume : 3    Issue : 3    Date : March 2008

Quality-of-Context and its use for Protecting Privacy in Context Aware Systems
Kamran Sheikh, Maarten Wegdam, and Marten van Sinderen
Page(s): 83-93
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Context-awareness refers to systems that unobtrusively adapt to the environment of their users on  
the basis of context information, popularly known as context-aware systems. One inherent property
of context information is that it possesses a certain quality, such as the certainty with which it has
been determined and so on. Different aspects of this quality are represented by a set of indicators
collectively known as Quality of Context (QoC). QoC also represents privacy sensitiveness of context
information, i.e. context information of higher quality is considered more privacy sensitive. An
important step towards making QoC indicators usable is to quantify them in tangible units. In this
paper we provide motivation for using QoC indicators as meta-information for context management
and use QoC as part of a user privacy enforcement framework. We propose five QoC indicators and
present different alternatives available for expressing them quantitatively.

Index Terms
Context-aware, Quality-of-Context, privacy, user-preferences.