Sensor Information Decay Process Modeling

Interest in Context Awareness is gaining ground in both Academic and Industrial communities. Most context information is provided by sensor networks. However, there is always a delay between the collection of the data and the usage of the information. In this paper, we developed a generic decay model for sensor information. The model contains an information-specific function and several parameters. In the evaluation, we identified the function and parameters for user location information and the model describes the decay process very well. With this model, the applications can be provided with the quality of information which is a necessary requirement of usage of sensor information.