Combining the KNX and an IEEE 802.15.4 based wireless system to build a Context Aware System

Abstract: In the present time there are new trends in the area of information technology. A keyrole plays the so called pervasive computing. As a result of the enormous increase of performance of the processorand storage technology while simultaneously reducing the weigth, volume and power consumption extremly, the computers become virtually invisible and ubiquitous. The area of prevasive computing requires a rethinking in information technology. This in particular deals with the ubiquitous information. The point is to provide the situation-, timeand location dependent information for everyone, everytime and everywhere. The emergence of the mobile, wireless and ubiquitous computing has made it necessary to develop a highly-dynamic infrastructure that enables clients to discover and utilize the services of interest, devices proposing those services to advertise them to the network, and a network to automatically detect the services that have become unavailable. This paper deals with the development of a distributed system composed of computers, sensors, actuators and intelligent agents to adapt services and ressources to the actual situation of one or several users. The base for the contextual services are on the one hand the location and on the other hand environmental criteria like temperature, loudness, illumination, the number and identification of the involved persons etc.