ibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Base Station Planning Planning for CDMA Capacity 33.6.4 Evolution ends with mostly CDMA When the evolution is complete, the wireless telephone system will be virtually all 3G CDMA. 8 We can do the same capacity analysis for a migrated CDMA system as we would do for a brand-new CDMA system. The migration becomes part of history. The old system is still there, and we probably want to continue to support it. How- ever, it may be reduced to a very small number of subscribers. This means that we may decide to reduce the old technology to a large-cell overlay grid for lower administration and maintenance. The full CDMA system is in place with the full 3G service choice. The service provider has one major advantage after a migration from FDMA or TDMA. There is a large col- lection of cells with a large amount of surplus CDMA capacity. This means that it may be a very long time before the service provider has to spend money for more base stations. 33.7 Migration from cdmaOne to cdma2000 Migration from cdmaOne to cdma2000 is far simpler. There are two reasons to make the change. First, cdma2000 does allow more voice calls in the same radio spectrum. The increase is not as dramatic as going from FDMA or TDMA to CDMA, but it is still welcome. Second, cdma2000 allows data service subscribers to join the wireless party. If there is a burgeoning market for wireless data service, then moving from cdmaOne to cdma2000 is a good way to participate in that market. cdma2000 does allow frequency superposition with cdmaOne. In fact, the cdma2000 channel directly supports cdmaOne user terminals making cdmaOne cellular calls. The whole issue of managing the transition of subscribers, managing the sale of dual-mode user terminals, and managing the overflow of traffic from one air interface to the other goes away in migrating cdmaOne to cdma2000. These two air interfaces were meant to fit together. T