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By Pat Hawker, D.E. Cole

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The MTSO maintains the individual subscriber records, the current status of the subscribers, call routing, and billing information to mention a few items. 4 Generic MTSO Configuration Figure 2-2 is a generic MTSO configuration. The MTSO is the portion of the network that interfaces the radio world with the public telephone network, PSTN. Mature systems often have multiple MTSO locations, and each MTSO can have several cellular switches located within each building. 32 Chapter 2 Figure 2-2 General MTSO configuration.

Marketing is involved with the decision because of the impact to the existing subscriber base and services that are envisioned to be offered. Some of the decisions are rather straightforward involving upgrading portions of the existing technology platforms that are currently deployed. Other operators have to make a decision as to which technology to utilize since they either are building a new system or have not migrated to a 2G platform, using only 1G. In later chapters various migration strategies are discussed relative to the underlying technology platform that exists.

6 Overview of Following Chapters This chapter has served as a brief introduction to mobile communications systems. The brief overview that has been given, however, is certainly not a sufficient background to enable a good understanding of third-generation technology. Therefore, before tackling the details of third-generation systems, it is necessary to better describe first- and second-generation systems. Chapter 2, “First Generation (1G),” addresses first-generation technology and Chapter 3, “Second Generation (2G),” delves into the second-generation systems.

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