Global Macrocell Suburban Microcell Urban Pico-Cell In Building Home Cell Audio Visual Laptop Terminal density. Figure 11-12 shows the topologies for the configuration of the wire- less future. If data demand is sufficient, it may be economical to upgrade such areas to EDGE, rather than deploy W-CDMA. Despite the apparent attractions of deploying EDGE as an incremental solution, operators will need to deploy UMTS, as only W-CDMA can support the high traffic densi- ties encountered in the core of mature networks. The initial release of the EDGE standard is aimed at increasing the capacity and speed of GPRS data services. The second phase of the EDGE standard will support packet voice using VoIP techniques. User Benefits of UMTS In line with subscribers' increasing expectations of GSM systems, UMTS will, of course, provide a very high quality of service in all environments. This will be further enhanced by the implementation of the Adaptive Multi- Rate (AMR) codec. In addition, users will benefit from the following features. Seamless Global Roaming The implementation of the Virtual Home Environment will give users the same seamless service regardless of serving network type. This means that Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Future Enhancements and Services Chapter 11 users can access their personalized service profile through any network from any terminal, optimize the display of information, and simplify access to the key services that they use most. This programmable personality will be stored in the Subscriber Identity Module (SIM) card, and this will enable the same user interface to be available on any phone anywhere in the world. High-Speed Data Services The UMTS network will provide cost-effective data transmission with the flexibility to remain online at all times, while only paying for the amount of data received or tran