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Introduction to GSM, 2nd ed.

Introduction to GSM Book

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Base Stations

Base stations - BS - may be stand alone transmission systems that are part of a cell site and are composed of an antenna system (typically a radio tower), building, and base station radio equipment. Base station radio equipment consists of RF equipment (transceivers and antenna interface equipment), controllers, and power supplies.

Base station radios are coordinated by the GSM system's BSC. The radio transceiver section is divided into transmitter and receiver assemblies. The transmitter section converts a voice signal to RF for transmission to wireless telephones and the receiver section converts RF from the mobile device to signals tha tare routed to the MSC or packet switching network. The controller section commands insertion and extraction of signaling information.

Radio Antenna Towers - Wireless base station antenna heights can vary from a few feet to more than three hundred feet. Radio towers raise the height of antennas to provide greater area coverage. There may be several different antenna systems mounted on the same radio tower.

A typical cell site antenna system has multiple antennas. One antenna is used for transmitting and two are used for reception for each radio coverage sector.

Radio Equipment - in the base station contains audio processing, modulation, and RF power amplifier assemblies. In the GSM system, the transmitter power level for the control channel is usually fixed to define the cell boundaries (e.g. a control channel). The power level of dedicated (individual) channels may dynamically change to the lowest level possible that allows quality communication with the wireless telephone.

Communication Links - are dedicated connections (such as E1 or T1 lines) that transfer control and media signals from the base station to GSM network components.

 

Introduction to GSM Book

more details

Introduction to GSM, 2nd ed.

This book explains the basic components, technologies used, and operation of GSM systems. You will discover why mobile telephone service providers have upgraded from 1st generation analog systems to more efficient and feature rich 2nd generation GSM systems. You will also discover how 2nd generation systems are gradually evolving into 3rd generation broadband multimedia systems.

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