I. INTRODUCTION
Ambient Intelligence (AmI) [1] suggests a model of interaction between people and their surrounded context-sensitive environment responding adaptively to user needs and habits. Technologies are embedded in daily life elements and present in the environment in a non-intrusive way, invisible but perceptible, accessed via intelligent but simple and natural interfaces. Mobile devices (PDAs and third generation phones), sensors, in-door localization systems, middleware and embedded computing devices on user clothes are some of the devices that can be found in this kind of environment.