opulation within a particular region. The data examples correspond to harmonized values making a case for the method used. However, they do not necessarily reflect the actual growth of network or exact projec- Deploying 3G Networks tion of network size. Nevertheless, do make realistic reference to the given concepts. Thus, they can serve as examples. The analytical process provided for dimensioning the radio side, aimed at setting the basis to focus on key WCDMA issues that will need optimization as networks get im- plemented for mixed services. The factors involved in WCDMA appear larger than those in current CDMA systems today. On the core network side, we have also intro- duced new factors not typically seen in 2G networks. On the transmission side, we have seen the traffic increase will demand larger bandwidths throughout the whole network and not only in the core, but also the radio side. References Ericsson-Orange, UMTS Traffic Model Dimensioning, Guidelines and Assumptions, Input on UMTS dimensioning examples, 2000. Yang, S.C. CDMA RF System Engineering, Artech House, Norwood, MA, 1998. TS 101 111 (UMTS 21.01). Universal Mobile Telecommunication System (UMTS); Over- all Requirements on the Radio Interface(s) of the UMTS. High Level Requirements Relevant for the Definition of the UTRA Concept, V 3.0.1, 1998- Lempiäinen, J. and Laiho-Steffens, J. "The Performance of Polarisation Diversity Schemes at a Base-Station in Small/Micro Cells at 1800MHz", IEEE Trans. Vehic. Tech., 47(3), 1998, 1087-1092. Laiho-Steffens, J. and Lempiäinen, J. "Impact of the Mobile Antenna Inclinations on the Polarisation Diversity Gain in DCS1800 Network", Proc. PIMRC'97, Helsinki, Finland, 1997, pp. 580-583. [7] Orange-Alcatel, 3G Network Dimensioning Exercise Considerations, Fall 2000, Switzer- land. [8] Orange-Ericsson, 3G Network Dimensioning Exercise Considerations, Summer 2000, Switzerland. The UMTS Network and Radio Access Technology: Air Interface Techniques for Future Mobile Systems Jonathan P. Castro Copyright © 2001 John W