Ambili Baby

S5 BCA

NO : 1

Goals & Agenda….

GPRS – BASIC ARCHITECHTURE

GPRS COMPONENTS

•SGSN

•GGSN

CLASSES OF GPRS

DEVICE

GPRS INTERFACES

4

GA

TE

WA

Y S

UB

SY

ST

EM

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

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

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

HAVING 4 SUBSYSTEMS

GPRS

BSS

NSS

RSS

GSS

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)

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

EACH SGSN & MSC IN THE NSSLAYER IS CONNECTED TO A NO OF BSC AT THE RSS LAYER.

HLR – STORES THE GPRS DATA AND INFORMATION ABOUT THE MOBILE STATION

GR/VLR – STORES THE MOBILE STATION LOCATION

GATEWAY SUBSYSTEM

CONSIST OF SGSN & GGSN

PROVIDE CONNECTIONS TO OTHER NETWORKS & PDA

PDA – PUBLIC DATA NETWORK

SIM

ME

BTS

BTS

BSC

BSC

HLR HLR

HLR HLR

MSC SGSN GGSN

PSTN,ISDN,

PSPDNCSPD

N

UMAbis

BSS NSS

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

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

CLASS 1

GPRS & GPRS CAN BE USED

SIMULTANEOUSLY

REQUIRES LOT OF BAND WIDTH & VERY COSTLY

CLASS 2

CAN USE GSM AND GPRS

SIMULTANEOUSLY BUT ONE AT A TIME

AUTOMATIC ACTIVATION &

DEACTIVATION IS PERFORMED

CLASS 3

ONLY HANDLE EITHER VOICE OR

DATA

NEED TO SWITCH MANUALLY B/W

SERVICES

GPRS ARCHITECHTURE

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

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