GPRS Seminar presentation

1. Ambili Baby
S5 BCA
NO : 1

2. Goals & Agenda….
GPRS – BASIC
ARCHITECHTURE
GPRS COMPONENTS
•SGSN
•GGSN
CLASSES OF
GPRS
DEVICE
GPRS
INTERFACES

4. 4
GATEWAYSUB
SYSTEM
3
RADIO SUB
SYSTEM
2
NETWORK SUBSYSTEM
1
BASE
STATION
SUB
SYSTEM
BTS
1
BTS
2
BSC
1
BSC
2
MSC
SGSN
TO A
NO
OF
BSC
HLR
MS 1 MS 2

5.  USES GSM ARCHITECTURE+ GSN(GPRS SUPPORT
NODES)
SGSN (SERVICING GSN)
GGSN ( GATEWAY GSN)
 USING PACKET SWITCHING
 USING THE ASYNCHRONOUS TDM WITH
MULTIPLE TIME SLOTS AT A TIME ( SAY 8)
 FASTER THAN GSM AND CDMA
 ENABLE SIMULTANEOUS TRANSMISSION OF
PACKETS

6. ACRONYNMS
 GPRS – GENERAL PACKET RADIO SERVICE
 MS – MOBILE STATION
 BTS – BASE TRANCEIVER STATION
 BSC – BASE STATION CONTROLLER
 MSC – MOBILE SERVICES SWITCHING CENTER
 HLR – HOME LOCATION REGISTER
 AUC – AUTHENTICATION CENTER
 EIR – EQUIPMENT IDENTITY REGISTER
 VLR – VISITOR LOCATION REGISTER

7. HAVING 4 SUBSYSTEMS
GPRS
BSS
NSS
RSS
GSS

8. RADIO STATION SUBSYSTEM
• CONSIST OF A NUMBER OF MS, BTS & BSC’S
• MS HAVING GPRS CAPABILITY
• STORES A CKSN( CIPHER KEY SEQUENCE
NUMBER – a logical identity)

9. NETWORK SUBSYSTEM
 IT CONSUST OF A NUMBER OF SGSNs
 ALSO CONSIST OF A NUMBER OF MSCs
 SGSN - will explain later
 EIR (Equipment Identity Register) – STORES THE
DETAILS OF THE EQUIPMENTS
HELPS IN – AUTHENTICATION, OPERATION
& MAINTANANCE OF SUBSYSTEMS

10.  EACH SGSN & MSC INTHE
NSSLAYER IS CONNECTEDTO
A NO OF BSC ATTHE RSS
LAYER.
 HLR – STORESTHE GPRS DATA
AND INFORMATION ABOUT
THE MOBILE STATION
 GR/VLR – STORESTHE MOBILE
STATION LOCATION

11. GATEWAYSUBSYSTEM
 CONSIST OF SGSN & GGSN
 PROVIDE CONNECTIONSTO OTHER
NETWORKS & PDA
 PDA – PUBLIC DATA NETWORK

12. SIM
ME
BTS
BTS
BSC
BSC
HLR HLR
HLR HLR
MSC SGSN GGSN
PSTN,
ISDN,
PSPDN
CSPD
N
UM
Abis
BSS NSS

13.  ROUTING THE PACKET SWITCHED DATA TO AND
FROM THE MS
 MOBILITY MANAGEMENT
 LOCATION MANAGEMENT
 AUTHENTICATION AND CHARGING FOR CALLS
 STORES THE LOCATION INFORMATION OF THE
USER
 USER’S PROFILE

14.  PROVIDE A GATEWAY B/W GPRS & PDN
 CONVERT DATA FROM SGSN TO PDP FORMAT(
PACKET DATA PROTOCOL)
 STORE THE CURRENT SGSN ADDRESS
 STORES THE LOCATION OF USER IN ITHS
LOCATION REGISTER
 PERFORM AUTHENTICATION & CHARGING
FUNCTIONS

15. CLASS 1
GPRS & GPRS CAN
BE USED
SIMULTANEOUSLY
REQUIRES LOT OF
BANDWIDTH &
VERY COSTLY
CLASS 2
CAN USE GSM AND
GPRS
SIMULTANEOUSLY
BUT ONE AT ATIME
AUTOMATIC
ACTIVATION &
DEACTIVATION IS
PERFORMED
CLASS 3
ONLY HANDLE
EITHERVOICE OR
DATA
NEEDTO SWITCH
MANUALLY B/W
SERVICES

16. GPRS ARCHITECHTURE

17. GPRS INTERFACES
 UM – ERROR CORRECTION / ERROR
DETECTION
 BTS-BSC – CHANNEL ALLOCATION,POWER
MEASUREMENT
 Gb – CONNECT BSC TO SGSN
 Gn – TO MOVE USER PROFILE WHEN THE
USER MOVES FROM ONE SGSN TO OTHER
 Gp – USER PROFILE AND SIGNALLING
INFORMATION B/W SGSN & GGSN OF OTHER
AREA

18.  Gf – USED TO REGISTER THE MS IN THE
NETWORK
 Gr – B/W SGSN & HLR , USED TO GET THE
USER PROFILE
 GC – B/W GGSN& HLR , USED BY GGSN TO
QUERY USER’S LOCATION & PROFILE TO
UPDATE ITS LOCATION REGISTER
 Gi – CONNECTS GGSV TO EXTERNAL PDN
 Gd – USED TO EXCHANGE SHORT MESSAGES