Infrastructure concepts for tagbased ubiquitous computing applications

Object tagging systems such as Radio Frequency Identification (RFID) enable the implementation of a wide variety of ubiquitous computing applications. Up to date, most of these prototypical applications have been implemented from scratch. Our goal is to develop concepts and software frameworks to ease the development of such applications. In this paper we present our experience with with a collection of prototypical ubiquitous computing applications based on tagged physical objects. We point out a number of basic tasks common to this kind of application, before presenting design concepts that we have found useful for structuring and implementing such applications. Building upon these concepts, we are creating software infrastructures to support the development of tag-based ubiquitous computing applications. 1