GSM, global system for mobile

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SATELLITE COMMUNICATION BROADCASTING
GLOBAL SYSTEM FOR MOBILE (GSM)
BY, A. POOJA SHUKLA ECE B IV
YEAR 190912066
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HISTORY OF GSM

• GSM was first introduced in the European market
  in 1991.
• In 1982, it was recognized as a standard for
  digital wireless communications.
• GSM was first named as Group Special Mobile.

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WHAT IS GSM.?

• GSM is a second generation cellular system
  standard.
• It was developed to solve the fragmentation
  problems of the first cellular generation.
• It is an 1st cellular system to specify digital
  modulation and network level architectures and
  services.
• It uses an 2G technology.

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• It is an open system and non propriety
  technology.
• The greatest feature of GSM is international
  roaming.

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GSM SERVICES AND FEATURES

• GSM services and features are classified into
  three major types. They are shown below,
• Telephone Services
• Data Services
• Supplementary ISDN Services

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TELEPHONE SERVICES

• It is also called as teleservices.
• The teleservices provides the following
  services,
• voice calls
• videotext and facsimile
• short text messages (SMS)

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DATA SERVICES

• It is also called as bearer services.
• They are limited to layers 1,2 and 3 of the OSI
  model.
• Services include packet switched protocols and
  data rates from 300 bps to 9.6 kbps.
• Data may be transmitted using either a
  transparent or nontransparent mode.

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SUPPLEMENTARY SERVICES

• This service is provided on top of data
  services or teleservices.
• It includes the following features,
• multiparty services or conferencing
• call waiting
• call hold
• call forwarding
• call diversion
• caller identification

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GSM SYSTEM ARCHITECTURE
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PSTN ISDN PDN
BSC
MS
BTS
MSC
GMSC
BSC
BTS
VLR
MS
EIR
BTS
AUC
MS
HLR
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• GSM network can be divided into following broad
  parts,
• Mobile Station (MS)
• Base Station Subsystem (BSS)
• Network Switching Subsystem (NSS)
• Operation Support Subsystem (OSS)

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• The components of GSM architecture include the
  functions of databases and messaging systems,
• Home Location Register
• Visitor Location Register
• Equipment Identity Register
• Authentication Center
• SMS serving Center
• Gateway MSC
• Charge Back Center
• Transcoder and adaption unit

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GSM OPERATION
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GSM CHANNELS
Downlink
Channels
Uplink

• Physical Channel Each timeslot on a carrier is
  referred to as a physical channel
• Logical Channel Variety of information is
  transmitted between the MS and BTS. Different
  types of logical channels
• Traffic channel
• Control Channel

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GSM NETWORK AREAS

• The basic service areas of GSM are given below,
• Cell Service Area
• Location Area
• MSC Service Area
• PLMN Service Area

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GSM FRAME STRUCTURE
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ADVANTAGES OF GSM

• Crisper, cleaner quieter calls
• Security against fraud and eavesdropping
• International roaming capability in over 100
  countries
• Improved battery life
• Efficient network design for less expensive
  system expansion
• Efficient use of spectrum
• Advanced features such as short messaging and
  caller ID
• A wide variety of handsets and accessories
• High stability mobile fax and data at up to 9600
  baud
• Ease of use with over the air activation, and all
  account information is held in a smart card which
  can be moved from handset to handset

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THANK YOU..!!!