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Under the guidance of

Dr. D.K.Rajouriya

Professor

Electronics and Communication Department

Dehradun Institute of Technology

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Overview

y Introduction to GSM

y Advantages of GSM over CDMA

y GSM Network

y GSM Modem

y Conclusion

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Introduction To GSM

y GSM service started in 1991

y 900 MHz 2100 MHz

y GSM network consist of interconnected cells where eachcell corresponds to a specific antenna

y GSM system uses a combination of techniques access to

radio channel:-

Frequency-multiplexing (FDMA)

Time-multiplexing (TDMA)

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Advantages Of GSM over CDMAy GSM is already used worldwide with over 480 million subscribers.

y International roaming permits subscribers to use one phone

throughout Western Europe. CDMA will work in Asia, but not

France, Germany, the U.K. and other popular European destinations.

y GSM is mature. This maturity means a more stable network with

robust features. CDMA is still building its network.

y GSM's maturity means engineers cut their teeth on the technology,

creating an unconscious preference.y The availability of Subscriber Identity Modules, which are smart

cards that provide secure data encryption give GSM m-commerce

advantages.

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Disadvantages Of GSM

y The disadvantages of GSM to CDMA are:

GSM need more spectrum for same number of calls

Lack of access to burgeoning American market.

Lack of privacy in GSM

More power requirements and more cell-to-cellcoordination needed by operators

Less cellular communications security

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GSM Network

GSM Network consist of three main parts:

y Mobile Station (MS) carried by the subscriber

y Base Station Subsystem (BSS) controls radio link with

mobile station

yNetwork & Switching Subsystem (NSS) mobility

management and switching of calls between mobile users,

and between mobile and fixed network users.

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Layout Of Generic GSM network

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GSM Modem

y Amodem (modulator-demodulator) is a device that modulatesan analog carrier signal to encode digital information, and alsodemodulates such a carrier signal to decode the transmittedinformation.

y GSM modem sends and receives data through radio waves

y GDW-11 485 modem provides a communication link between

GSM/GPRS network and monitoring systemy GDW-11 is a radio transmitter and receiver at low speed

y A GPRS modem is a GSM modem with additional support forGPRS technology for data transmission.

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Conclusion

Today, the battle between CDMA and GSM is muddled. Where

at one point Europe clearly favored GSM and North America,

CDMA, the distinct advantage of one over the other has

blurred as major carriers like AT&T Wireless begin to support

GSM .

The GSM network is composed of several hundreds of cell

cells arranged overlapping one over the other, in such a way

that produces radio broadcast coverage continuesuninterrupted.

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THANK YO

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