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Introduction to GSM
-GSM was orignally developed to serve as the cellular service for Europiean contries
-Currently it is the worlds most popular standard for new cellular radio and personal communication equipment throughout the world
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2. GSM Features 1] SIM-Subscriber Identitity Module
Which stores information in the form of ID number,N/w and countries where subscriber is entitled to service,privacy keyes and other user specific information
Each subscriber have 4 digit personal ID no to activate GSM service
2]On The Air Privacy-
The privacy is made possible by encrypting the digital bit stream sent by GSM transmitter by using specific secret cryptographic key.
That is only known to cellular carrier
This key changes with time for each user
Every carrier and GSM eqipment manufacturermust sign the memorandum of understanding before developing GSM eqipment

3. Continue......
The Mou is an international agreement which allows the sharing of cryptographic algorithm and other information between countries and carriers

4. GSM Services
GSM services follow ISDN Guidlines and are classified into
1]Teleservices
2]Data service
3]User service
1]Teleservice-Standard Mobile telephony
2]Data service-Computer -to-computer communication and packet switched traffic
3]User service-they are divided into three major categories
1]Telephone service
2]Bearer Service
3]Supplimentary ISDN services

5. Continue..... 1]Telephone services-
Including emergency calling,videotext and teletex
2]Bearer services-
Supports packet switched protocol and data rates from 300 bps to 9.6 kbps
The mode in which data can be transported could be transparent or non transparent mode

6. Continue 3]Supplimentary ISDN service - Digital in nature
It includes call diversion,closed user groups and caller identification
They also include the short messege service which allow GSM subscriber and base stations to transmit alphanumeric pages of limited length
While simultaneously carring normal voice traffic
SMS also provides cell brodcasting which allows gsm BASE Station to repetitively transmit ASCII messages with as many as fifteen strings in concatenating fachion

7. GSM Architecture

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GSM system architecture consist of three major
interconnected subsystem that interact between themselves
BSS-Base station Subsystem
NSS-Network and switching subsystem
OSS-Operation Support subsystem
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