ce that uses CDMA technology to meet the requirements for 3G wireless communication systems. In addition, the family includes a standard that specifies analog operation to support dual-mode mobile stations and base stations. The technical requirements contained in cdma2000 form a compatibility standard for CDMA systems. They ensure that a mobile station can obtain service in a system manufactured in accordance with the cdma2000 stan- dards. The requirements do not address the quality or reliability of that ser- vice, nor do they cover equipment performance or measurement procedures. Compatibility, as used in connection with cdma2000, is understood to mean that any cdma2000 mobile station is able to place and receive calls in cdma2000 or IS-95 systems. Conversely, any cdma2000 system is able to place and receive calls for cdma2000 and IS-95 mobile stations. In a sub- scriber's home system, all call placements are automatic. Similarly, call placement is automatic when a mobile station is roaming. To ensure com- patibility, radio system parameters and call processing procedures are spec- ified. The sequence of call processing steps that the mobile stations and 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 base stations execute to establish calls is specified, along with the digital control messages and, for dual-mode systems, the analog signals that are exchanged between the two stations. The base station is subject to different compatibility requirements than the mobile station. Radiated power levels, both desired and undesired, are fully specified for mobile stations, in order to control the RF interference that one mobile station can cause another. Base stations are fixed in loca- tion and their interference is controlled by proper layout and operation of the system in which the station operates.