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Extra info for Wireless Technician's Handbook (Artech House Mobile Communications Library) 2nd edition
In the analog systems, the process of the handoff is controlled by the base station controlling system. Base stations typically use location receivers, which can measure the received reverse channel power. When the received power drops below a certain threshold, either an absolute power level or the carrier-to-interference ratio (C/I), the BSC will initiate and control a handoff. Naturally, this process requires intensive and complex calculations. The handoff must occur at the right moment, or many calls will drop.
That said, with spectrum as tight and expensive as it is, TDD becomes an attractive alternative, as only one frequency band, which is shared by the uplink and downlink, is needed. There are some limitations to TDD, but the TDD versions of the 3G WCDMA standard will be deployed. 9). Thus, most multiple access systems use some form of frequency-division multiple access (FDMA). Thus AMPS, the analog system used in the Americas, is an FDMA/FDD wireless format. 10). 9 FDMA involves separating users by frequencies—each user gets his or her own frequency set: one frequency for the uplink, and a corresponding frequency for the downlink.
Information about each user that it knows is in its coverage area. In this way, the mobile switching center (MSC)—formerly the mobile telephone switching office (MTSO)—knows who and where the terminals in its area are. The second database is the home location register (HLR). The HLR contains the subscription information for subscribers. Using these two databases, the MSC can quickly set up calls, whether incoming or outgoing. The MSC then links up with the public switched telephone network (PSTN), which, of course, is the outside world.