The growth of telecommunications has been largely based on mobile and data services in the past 10 years and the growth will continue. For instance, it is forecasted that after 2005 the mobile traffic turnover in Europe will exceed that of fixed telephone traffic and the penetration of Internet access through mobile will exceed that of fixed access. It is expected that the new value added services will be Internet-based and the IP traffic will outweigh the amount of traditional ISDN based telephone traffic. The transition from the existing telecommunications services to mobile and Internet based ones will change the service infrastructure as well as the customer and service management structures. In wireless communications there are several new standards being developed and implemented to improve the data transmission rate over radio channels, to combine both voice, packet data and multimedia services in the terminals and to improve the service quality and usability. Narrow band packet radio standards such as General Packet Radio Service (GPRS) and i-Mode are already operative and broadband IMT-2000 standards, also called as Third Generation (3G) Mobile, have been developed in Japan, Europe and US. At the same time Wireless LAN and Bluetooth technologies mature and provide short-range data access to terminal devices. The emerging new technologies create opportunities not only to incumbent teleoperators but also to new network operators, IT companies and new service and content providers.

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Preface. Part 1: Performance and Modelling. Impact of the Timer-CU of the AAL2 Protocol on Traffic Performance within the UTRAN; R. Makké, et al. CMA and PRMA Analytical Models for Voice Users in Satellite-UMTS Systems; A. Ibrahim, S. Tohme. Wireless Scheduling Approaches and Practical Implementation Issues; C. Stepping.Performance Evaluation of Service Connectivity in Mobile Augmented Reality; T. Turunen,et al. Reliable Multicast in Mobile Networks; P. Tiihonen, P. Hiirsalmi. Effect of Delays on TCP Performance; A. Gurtov. Part 2: Quality of Service. Priority-based Transmission in IEEE 802.11 Networks; T. Janczak, J. Wozniak. A Service Discipline for Support of IP QoS in IEEE802.11 Networks; A. Grilo, et al. QoS/GOS Management Measurements in IP/ATM and Wireless Environments; K. Heikkinen, et al. Part 3: Cellular Systems. Building Mobile Intranets Over The UMTS; C.F. Grecas, et al. Enhancing Packet Data Access in WCDMA; J. Peisa, et al. Part 4: Wireless Systems. 4G Mobile Network Architecture; K. Ikkelä, et al. Wireless LANs and Regional Networking; J. Ikonen, J. Oksanen. Spatial Reuse in Wireless LAN Networks; K.A. Agha, L. Viennot. Part 5: Voice over IP. Using SIP Extensions for Signalling in Stream Service System; R. Lehtonen, et al. Voice Over IP Implementation Using Session Initiation and Media Gateway Control Protocols; O. Kauranen, J Kellokoski Part 6: Services. Future Scenarios on Bluetooth: Effects on Value Networks and Business Models; L.-M. Sainio, T. Sikiö. Developing a User Centric MultiSphere Model for Mobile Users Using a Visual Cell Platform; S. Hickey, P. Pulli Supporting Secure and Transparent Delegation in theCORBA Proxy Platform &pgr;2; Z. Nochta, et al. Wireless Micro-payment System in Networks; J. Karvonen, P. Pulli.