Gsm

Gsm

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  SATELLITE COMMUNICATION & BROADCASTING GLOBAL SYSTEM FOR MOBILE (GSM) BY, A. POOJA SHUKLA ECE ‘B’ IV YEAR 190912066 SAVEETHA UNIVERSITY
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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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  Figures: March 2005 Reliance 3% Spice MTNL Bharti Aircel 4% 2% BSNL 4% Bharti 27% Hutch BPL 6% IDEA BPL IDEA Aircel 13% BSNL Spice Hutch 22% Reliance 19% MTNL
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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 isan open system and non propriety technology.  The greatest feature of GSM is international roaming.
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  GSM SERVICES ANDFEATURES GSM services and features are classified into three major types. They are shown below, Base GSM SMS Infrastructure Base Station Station 1. Telephone Services SMSC HLR 2. Data Services 3. Supplementary ISDN Services
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  TELEPHONE SERVICES • Itis 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 • Itis 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 • Thisservice 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 waiting  caller identification
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  GSM SYSTEM ARCHITECTURE
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  PSTN ISDN PDN BSC MS BTS MSC GMSC BTS BSC VLR MS BTS EIR AUC MS HLR
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  o GSM networkcan 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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  o The componentsof 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 Speech Speech Speech coding Speech decoding 13 Kbps Channel Coding Channel decoding 22.8 Kbps Interleaving De-interleaving 22.8 Kbps Burst Formatting Burst Formatting 33.6 Kbps Ciphering De-ciphering 33.6 Kbps Radio Interface Modulation Demodulation 270.83 Kbps
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  GSM CHANNELS Downlink Channel s 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, 1. Cell Service Area 2. Location Area 3. MSC Service Area 4. 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…..!!!