1. S.V. polytechnic collageS.V. polytechnic collage
bhopalbhopal
Presentation on GSMPresentation on GSM
NetworkNetwork
Submited To:- Submited By:-
Miss Anupriya mem Group:- shubhangi payasi
& naveen suryawanshi
Branch:- information sequrity
final year
2. • GSM-Introduction
• Architecture
• GSM Operation
• Channels
• Mobile Station Associated Numbers
• Mobile Station Roaming Number
• Characteristics of GSM Standard
• Applications
ContentsContents
3. What is GSM ?What is GSM ?
GSM stand for a “Global System for Mobile communication”.
we normally says that
“ A system which used for transmit the data among different
suscribers unit is called GSM”. Second generation cellular
standard developed to create voice services and data delivery
using digital modulation by GSM
4. GSM: HistoryGSM: History
• Developed by Group Spécial Mobile (founded 1982) which was an
initiative of CEPT ( Conference of European Post and
Telecommunication )
• Aim : to replace the incompatible analog system
• Full set of specifications phase-I became available in 1990
• GSM is named as “ Global System for Mobile communication “
• Today many providers all over the world use GSM (more than 165
countries in Asia, Africa, Europe, Australia, America)
• More than 1300 million subscribers in world and 45 million subscriber in
India.
5. GSM in WorldGSM in World
Figures: March, 2005
37%
1%
4%43%
4%
3%
3%
3% (INDIA)
3%
Arab World
Asia Pacific
Africa
East Central Asia
Europe
Russia
India
North America
South America
6. GSM System ArchitectureGSM System Architecture
BSC
BSC
MSC
MS
MS
MS BTS
BTS
BTS
GMSC
PSTN
ISDN
PDN
EIR
AUC
HLR
VLR
7. GSM System ArchitectureGSM System Architecture
Mobile Station (MS)
Mobile Equipment (ME)
Subscriber Identity Module (SIM)
Base Station Subsystem (BSS)
Base Transceiver Station (BTS)
Base Station Controller (BSC)
Network Switching Subsystem(NSS)
Mobile Switching Center (MSC)
Home Location Register (HLR)
Visitor Location Register (VLR)
Authentication Center (AUC)
Equipment Identity Register (EIR)
9. GSM CGSM Channel
In telecommunications a channel, refers either to a physical transmission
medium such as a wire, or to a logical connection over a multiplexed medium
such as a radio channel.
The channel used in the air interface is divided into two types:
1. Physical channel
2. Logical channel.
Physical channel : It is the medium over which the information is carried.
Logical channel : It consist of information carried over a physical channel.
12. Logical ChannelsLogical Channels
TCH
(traffic)
CCH
(control)
BCH
CCCH
Dedicated
2.4 kbps
4.8 kbps
9.6 kbps
FCCH(Frequency correction channel)
SCH(Synchronization channel)
PCH(Paging )
RACH(Random Access control channel)
AGCH(Access Grant control channel)
SDCCH(Stand Alone dedicated control )
SACCH(Slow-associated control channel)
FACCH(Fast-associated control channel)
Half rate 11.4kbps
Full rate 22.8kbps
Voice
Data
Logical
13. Logical Channel DescriptionLogical Channel Description
Broadcast Controll Channel :-The BCCH is a point-to-multipoint channel (BSS-to-
MS).
SCH - Synchronisation of the MS
FCHMS - frequency correction.
Common controll channel:-Control the information between MS and BTS.
RACHMS - access requests, response to call announcement, location update, etc.
PCH(MS) - terminating call announcement and gives mobile alert message
AGCH - Acknowledge channel requests from MS and allocate a SDCCH.
Dedicated Controll Channel:- its provides to by direction and unique direction
funtionality.
FACCH - using for user authentication and traffic controlls
SACCHt - TCH in-band signalling, e.g. for link monitoring.
SDCCH - using for during call setup, registration / location updates and message
authentication
14. MobileMobile StationStation
Associated/Directory NumbersAssociated/Directory Numbers
Moblie Station Directory Number:- MSDN is a number uniquely identifying a subscription
in a GSM mobile network. Simply put, it is the telephone number to the SIM card in a
mobile/cellular phone .
MSDN is primary key to the HLR record number with maximum 15
digits without prefixes.
There are:-
C.C = Country Code
NDC = National Destination Code
SN = Subscriber number
For Ex. MSISDN: +91-7381 730900 (Odisha)
CC: +91 INDIA-Country code
NDC: 7381 Odisha- National destination code
SN: 730900- costmore number
MSDN= C.C+NDC+SN
15. Mobile Station Roaming NumberMobile Station Roaming Number
Mobile Station Roaming Number:- MSRN is a temporary identity which is
assigned during the establishment of a call to a roaming substation.
Mobile Station Roaming Number
New Network
15
MSC
HLR
(BSS)
Other
MSC
HLR
(Other BSS)
16. Characteristics of GSM StandardCharacteristics of GSM Standard
Fully digital system using 900,1800 MHz frequency band.
TDMA over radio carriers(200 KHz carrier spacing.
8 full rate or 16 half rate TDMA channels per carrier.
User/terminal authentication for fraud control.
Encryption of speech and data transmission over the radio
path.
Full international roaming capability.
Low speed data services (upto 9.6 Kb/s).
Compatibility with ISDN.
Support of Short Message Service (SMS).
17. Advantages of GSM over Analog systemAdvantages of GSM over Analog system
Capacity increases
Reduced RF transmission power and longer battery life.
International roaming capability.
Better security against fraud (through terminal validation
and user authentication).
Encryption capability for information security and privacy.
Compatibility with ISDN, leading to wider range of
services
18. GSM ApplicationsGSM Applications
There are many appication of GSM. These are define
shortly:-
Mobile telephony
GSM-R
Telemetry System
Value Added Services
