sson puts it [16], fixed and mobile convergence includes everything from new services to the integration of nodes, networks and operating systems. The user may have, e.g. the same voice mailbox for fixed and mobile telephony, while the operator can also use the large sections of the network in a coordinated manner for different types of access. Thus, convergence is now a new frontier in communications, where UMTS will evolve. Figure 1.3 illustrate how single service networks will evolve into multi-purpose net- works with multi-level access points. With IP becoming more pervasive in the back- bone, the challenge of integrating voice and data services in the fixed and mobile envi- ronment become more formidable. IS-136 has adopted EDGE as its air-interface expansion. The UMTS Network and Radio Access Technology Future Multi-Service Networks Present Single-Service Networks TheMultiserver Client Concept Content Information Content Inputs Inputs Data/IP Servers Networks Intelligent Communications Control Gateways Media Multi-Level Service Backbone Caloway Cable Media Multi Level Multi Level Access Multi Level Access Points Points Access Points Access Transport and Switching Networks Clients towards Integrated Services Figure 1.3 Multi-service network. Table 1.1 The Converging Industry in Telecommunications, Computers and Media Telecom Wire-line Wireless Mobility Industry mobile Internet Telecoms Computer Desk top PC-LAN PC- Internet / Intranet WWW Converged Industry Frames Computing Servers Electronic Commerce Industry Media Electronic Publication New battle Industry Interactive Entertainment ground It boils downs to the transformation of the Telecom, Computer and Media Industry, resulting into the Converged Industry as illustrated in Table 1.1. Clearly then, UMTS will be part of the convergent Industry with a trend towards multi- services within integrated infrastructures. THIRD GENERATION MOBILE SYSTEM REQUIREMENTS Although third generation (3G) systems involve primarily infrastructure change in the Air-Interface (A