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LZB 115 2508 R1A Introduction to GSM/DCS/PCS Systems
Chapter 2 -
Introduction to GSM/DCS/PCS Systems
Introduction
Cellular telecommunication is one of the fastest growing and most demanding telecommunications appli-
cations ever. Digital cellular solutions are successfully competing with traditional wire networks and cord-
less telephones. Eventually, digital cellular mobile telephones will be the universal way to
telecommunicate.
CME 20/CMS 40 is a GSM-based system operating in the 900, 1800, or 1900 MHz range (there is a com-
mon platform for CME 20 and CMS 40: Telecommunications Standards Institute (ETSI) and American
National Standards Institute (ANSI). It is a "total system" solution including switching centers, location
registers, base station controllers, and base transceiver stations, as well as facilities for centralized opera-
tions and maintenance and mobile stations (handsets). The system ensures that operating companies
receive the benefits of a full system standard with open interfaces, complete security, and roaming, among
others. CME 20 and CMS 40 are designed to provide users with advanced telecommunication services
according to technical specifications. Also, to meet demands made by operating companies (sometimes
referred to as "operators" and "carriers" in some countries) for flexible network solutions, innovative
charging, service segmentation, service creation, and easy Operation and Maintenance (O&M).
Ericsson has been designing cellular radio systems since the 1970s, and offers network products for all
major cellular standards - such as the Nordic Mobile Telephone (NMT) system, the Total Access Commu-
nication System (TACS), Advanced Mobile Phone System (AMPS), Digital AMPS; the Personal Digital
Cellular (PDC) standard (Japan), and the Global System for Mobile Communication (GSM) standard GSM
900, Digital Communication System (DCS) 1800, and the Personal Communications System (PCS) 1900.
2-1
Inroduction to GSM/DCS/PCS Systems LZB 115 2508 R1A
System Nodes and Related Equipment
Refer to Table 2-1 for system frequency ranges.
Table 2-1. Frequency Ranges
System Frequency
GSM 900 890-960 MHz
DCS 1800 1710-1880 MHz
PCS 1900 1850-1990 MHz
GSM 900 is strong in radio coverage. DCS 1800 and PCS 1900 are strong in radio capacity. Additionally,
GSM and DCS is often offered by combined license (PCS 1900 is the GSM standard's American version).
See Figure 2-2. CME 20 / CMS 40 consists of the following: