Gsm-Global System for Mobile Communication

What is GSM ●History of GSM ●Generation of GSM ●Services of GSM ●Advantages of GSM ●Disadvantages of GSM ●

What is GSM GSM is a mobile communication modem; it is stands for global system for mobile communication (GSM).It is widely used mobile communication system in the world. GSM is an open and digital cellular technology used for transmitting mobile voice and data services.

History of GSM ●

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GSM was first introduced in the European market in the 1991.

In 1982, it was recognized as a standard for Digital Wireless Communication.

GSm was named as Group Special Mobile

Generation of GSM ●

Ist Generation:- Analog Mobile Technologies:-AMPS, TACS & NMT.

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2nd Generation:- Digital Mobile Technologies:- GSM, CDMA

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2.5 Generation:- Enhancement of GSM:- GPRS

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3rd Generation:- Technologies Coursed by ITU- IMT

Services of GSM ●

Tele Services

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Bearer or Data Services

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Supplementary Services

Tele Services â—?

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Telecommunication services that enable voice communication via mobile phones.

Offered Services Mobile Telephony Emergency Calling

Bearer or Data Services ●

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It inlcudes the following services:Rate adapted sub-rate information like circuit switched asynchronous and synchronous duplex data, 300-9600 bits.

Speech and data swapping during a call, i.e. alternate speech and data.

Modem selection, i.e. selection of 3.1 kHz audio service when inter-working with ISDN.

Supplementary Services It includes the following services:●

Call forwarding

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Barring of Outgoing Calls

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Barring of Incoming Calls

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Advice of Charge

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Call Hold

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Call Waiting

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Multiparty service

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Explicit Call Transfer

Characteristics of GSM ●

Improved spectrum efficiency

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International roaming

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Compatibility with integrated services digital network (ISDN)

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Support for new services.

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SIM phonebook management

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Fixed dialing number (FDN)

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Real time clock with alarm management

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High-quality speech

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Uses encryption to make phone calls more secure

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Short message service (SMS)

Advantages of GSM ●

Crisper, cleaner quieter calls

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International roaming possible

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Security against fraud and eavesdropping

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Data transmission is supported

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A wide variety of handsets and accessories

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Improved battery life

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Large market

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New services offered due to ISDN compatibility

Disadvantages of GSM ●

Security Issues

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Less Efficency

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Dropped and missed calls

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