Introduction to Mobile Telephone Systems


Overview

Cellular, personal communication service (PCS), and third generation 3G mobile radio systems are all cellular wireless communication networks that provide for voice and data communication throughout a wide geographic area. Cellular systems divide large geographic areas area into small radio areas ( cells ) that are interconnected with each other. Each cell coverage area has one or several transmitters and receivers that communicate with mobile telephones within its area.

Figure 1.1 shows a basic cellular system. The cellular system connects mobile radios (called mobile stations) via radio channels to base stations. Some of the radio channels (or portions of a digital radio channel) are used for control purposes (setup and disconnection of calls) and some are used to transfer voice or customer data signals. Each base station contains transmitters and receivers that convert the radio signals to electrical signals that can be sent to and from the mobile switching center (MSC). The MSC contains communication controllers that adapt signals from base stations into a form that can be connected (switched) between other base stations or to lines that connect to the public telephone network. The switching system is connected to databases that contain active customers (customers active in its system). The switching system in the MSC is coordinated by call processing software that receives requests for service and processes the steps to setup and maintain connections through the MSC to destination communication devices such as to other mobile telephones or to telephones that are connected to the public telephone network.

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Figure 1.1: Basic Cellular System



Introduction To Mobile Telephone Systems[c] 1G, 2G, 2.5G, and 3G Wireless Technologies and Services
Introduction To Mobile Telephone Systems[c] 1G, 2G, 2.5G, and 3G Wireless Technologies and Services
ISBN: 974694320
EAN: N/A
Year: 2006
Pages: 16

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