Wireless and Cellular Telecommunications, Third Edition
Just in time for the rebounding wireless industry, this updated classic text offers an in-depth engineering guide for both voice and data services, Wi-Fi, 3G, WiMAX, and more.
TABLE OF CONTENTS Wireless and Cellular Telecommunications, Third Edition
Chapter 2: Introduction to Cellular Systems
To describe cellular systems in general, it is necessary to include discussion of the basic cellular systems, their performance criteria, the uniqueness of the mobile radio environment, the operation of the cellular systems, reduction of cochannel interference, handoff s, and so forth.
2.1 BASIC CELLULAR SYSTEMS
There are two basic cellular systems; one is the circuit-switched system and the other is the packet-switched system.
2.1.1 Circuit-Switched Systems
In a circuit-switched system, each traffic channel is dedicated to a user until its cell is terminated. We can further distinguish two circuit-switched systems: one for an analog system and one for a digital system.
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A. Analog System
A basic analog cellular system [1], [2] [3] consists of three subsystems: a mobile unit, a cell site, and a mobile telephone switching office (MTSO), as Fig. 2.1 shows, with connections to link the three subsystems.
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Mobile units. A mobile telephone unit contains a control unit, a transceiver, and an antenna system.
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Cell site. The cell site provides interface between the MTSO and the mobile units. It has a control unit, radio cabinets, antennas, a power plant, and data terminals.
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MTSO. The switching office, the central coordinating element for all cell sites, contains the cellular processor and cellular switch. It interfaces with telephone company zone offices, controls call processing, provides operation and maintenance, and handles billing activities.
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Connections. The radio and high-speed data links connect the three subsystems. Each mobile unit can only use one channel at a time...
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