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CASE
STUDY ON GSM

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INTRODUCTION:

If you are in
Europe or Asia and using a mobile phone, then most probably you are
using GSM technology in your mobile phone.

GSM
stands for Global System for Mobile
Communication. It is a digital cellular technology used for
transmitting mobile voice and data services.

The
concept of GSM emerged from a cell-based mobile radio system at Bell
Laboratories in the early 1970s.

GSM is
the name of a standardization group established in 1982 to create a
common European mobile telephone standard.

GSM is
the most widely accepted standard in telecommunications and it is
implemented globally.

GSM is
a circuit-switched system that divides each 200 kHz channel into
eight 25 kHz time-slots. GSM operates on the mobile communication
bands 900 MHz and 1800 MHz in most parts of the world. In the US,
GSM operates in the bands 850 MHz and 1900 MHz.

GSM
owns a market share of more than 70 percent of the world’s digital
cellular subscribers.

GSM
makes use of narrowband Time Division Multiple Access (TDMA)
technique for transmitting signals.

GSM was
developed using digital technology. It has an ability to carry 64
kbps to 120 Mbps of data rates.

Presently
GSM supports more than one billion mobile subscribers in more than
210 countries throughout the world.

GSM
provides basic to advanced voice and data services including roaming
service. Roaming is the ability to use your GSM phone number in
another GSM network.

FEATURES
OF GSM:

Improved
spectrum efficiency

International
roaming

Low-cost
mobile sets and base stations (BSs)

High-quality
speech

Compatibility
with Integrated Services Digital Network (ISDN) and other telephone
company services

Support
for new services

COMPONENTS
OF GSM:

A GSM network comprises of many
functional units. These functions and interfaces are explained in
this chapter. The GSM network can be broadly divided into:

The
Mobile Station (MS)

The
Base Station Subsystem (BSS)

The
network swtiching subsystem(NSS)

The
Operation support subsystem (OSS)

Additional
components are:

Home
Location Register (HLR)

Visitor
Location Register (VLR)

Equipment
Identity Register (EIR)

Authentication
Center (AuC)

SMS
Serving Center (SMS SC)

Gateway
MSC (GMSC)

Chargeback
Center (CBC)

Transcoder
and Adaptation Unit (TRAU)

BLOCK
DIAGRAM OF GSM:

SERVICES
PROVIDED BY GSM:

GSM offers three basic types of
services:

Telephony
services or teleservices

Data
services or bearer services

Supplementary
services

Teleservices

VoiceCalls

Videotext
and Facesmile

Short
Text Messages

Bearer
Services

Data services or Bearer Services
are used through a GSM phone. to receive and send data is the
essential building block leading to widespread mobile Internet
access and mobile data transfer. GSM currently has a data transfer
rate of 9.6k. New developments that will push up data transfer rates
for GSM users are HSCSD (high speed circuit switched data) and GPRS
(general packet radio service) are now available.

Supplementary
Services

Conferencing

Call Waiting

Call Hold

Call Forwarding

Call Barring

Number Identification

Advice of Charge (AoC)

Closed User Groups (CUGs)

Unstructured supplementary
services data (USSD)

CONCLUSION:

The
communication development and the increase of living standard of
people are directly related to the more use of cellular mobile.
Cellular mobile radio-the high end sophisticated technology that
enables every one to communicate anywhere with anybody. The mobile
telephony industry rapidly growing and that has become backbone for
business success and efficiency and a part of modern lifestyles all
over the world.

In this thesis work we have tried to give
and over view of the GSM system. We hope that we gave the general
flavor of GSM and the philosophy behind its design. The GSM is
standard that insures interoperability without stifling competition
and innovation among the suppliers to the benefit of the public both
in terms of cost and service quality.

The features and
benefits expected in the GSM systems are superior speech quality, low
terminal, operational and service costs, a high level security,
providing international roaming support of low power hand portable
terminals and variety of new services and network facilities. In near
forth coming days, the third generation mobile telephony becomes
available whole over the world, which will give the facility of
videoconference in mobile telephone.

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