d in Sec. 40.2. Many of these cells have only a subset of the total code division multple access (CDMA) carrier set because there is not enough traffic volume to justify the entire set. A one-CDMA-carrier base station is a prime candidate for low-cost growth. Adding a carrier to a base station is typically less expensive than adding sectors and a lot less expensive than adding new cells. And many of these one-carrier base stations are not even using the full capacity of that one CDMA carrier. Other base stations may be less extreme cases of underutilization, but they also rep- resent an opportunity to increase their capacity at lower cost than cell splitting. These base stations may not be using all the CDMA carriers, or they may be able to support more sectors. We want to encourage demand in these areas. As more subscribers use wireless ser- vices in these places, the service provider earns more revenue without paying for more equipment. This increase in revenue can be an opportunity to lower rates to a more competitive level, or it can be a chance to make some profit on the enormous invest- ment that a large CDMA system represents. 45.1.2 Existing transport backbone Some areas have low-cost, readily available telephone transport. One of the major is- sues in base station placement is installing adequate backhaul facilities. If we can find base station locations where backhaul is cheap and easy, then these are good places to put base stations. SWe recall a Dilbert comic strip where the boss was enthusiastically promoting Project BIFF. What did BIFF stand for? Big Improvements For Free. Well-targeted growth is the closest we can come to Project BIFF in the wireless telephony world. 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. Regional Growth in a Specific Area Increasing Capacity The most obvious place for transport availability is a poin