This second edition of the seminar -- entitled ``Mobile Systems II'' -- discusses in the first section a service called positioning. The required systems for such a task as well as the techniques to be applied in the world are being discussed. While the satellite-based positioning based on GPS and GALILEO are introduced, cell-based telecommunication systems and their positioning techniques are addressed as well. The second section addresses the access of directories in mobile environments. Following the presentation of the X.500 directory service the LDAP (Light-weight Directory Access Protocol) is summarized. By combining those two parts a model for accounting WLAN (Wireless Local Area Network) has been developed and the suitability of the LDAP protocol in wireless accesses is discussed. Finally, the third section worked on two technologies in the wireless domain: WAP (Wireless Application Protocol) and i-mode. The protocol architecture of WAP 1.x and 2.x are outlined and applications for such a model are described. This part is complemented by the summary of the i-mode architecture and its sample applications. This section concludes with a comparison of both approaches.     «

This second edition of the seminar -- entitled ``Mobile Systems II'' -- discusses in the first section a service called positioning. The required systems for such a task as well as the techniques to be applied in the world are being discussed. While the satellite-based positioning based on GPS and GALILEO are introduced, cell-based telecommunication systems and their positioning techniques are addressed as well. The second section addresses the access of directories in mobile environments. Follo...    »