Gprs architecture ppt

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Prepared by: Arpita Sanghani 14PGIT020 M.Tech-IT 2 nd sem

Transcript of Gprs architecture ppt

Page 1: Gprs architecture ppt

Prepared by:

Arpita Sanghani

14PGIT020

M.Tech-IT 2nd sem

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Content

What is GPRS?

Characteristics of GPRS

GPRS Architecture

Support nodes of GPRS

Network Enhancements

GPRS interface

Security

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What is GPRSGeneral Packet Radio Service • General -> not restricted to GSM use (DECT ?, 3rd generation

systems ?)

• Packet Radio -> enables packet mode communication over air

• Service, not System -> existing BSS (partially also NSS) infrastructure is used

Main benefits• Resources are reserved only when needed and charged accordingly

• Connection setup times are reduced

• Enables new service opportunities

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GPRS CharacteristicsGPRS uses packet switched resource allocation

• resources allocated only when data is to be sent/received

Flexible channel allocation• one to eight time slots

• available resources shared by active users

• up and down link channels reserved separately

• GPRS and circuit switched GSM services can use same time

slots alternatively

Traffic characteristics suitable for GPRS• Intermittent, bursty data transmissions

• Frequent transmissions of small volumes of data

• Infrequent transmission of larger volumes of data

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GPRS Architecture

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4G

AT

E W

AY

SU

B

SY

STE

M

3RADIO SUB

SYSTEM

2NETWORK SUBSYSTEM

1BASE

STATION SUB

SYSTEM

BTS 1 BTS 2

BSC 1BSC

2

MSC VLR

SGSN TO A

NO OF BSC

EIR

HLR

MS 1 MS 2

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GPRS Architecture.. Uses gsm architecture+ gsn(gprs support nodes)

Sgsn (servicing gsn)

Ggsn ( gateway gsn)

Uses packet switching

Faster than gsm and cdma

Enable simultaneous transmission of packets

SGSN and GGSN will be explain in next slide

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GPRS support nodes There are two network nodes use to offer packet data

service called GPRS support nodes

1) Serving GPRS Support Node (SGSN)

2) Gateway GPRS Support Node (GGSN)

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Serving GPRS Support Node(SGSN)

Serving GPRS Support Node(SGSN) is one of the GPRS support node

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

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Gateway GPRS Support Node(GGSN)

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 its location register

Perform authentication & charging functions

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HAVING 4 SUBSYSTEMS

GPRS

BSS

NSS

RSS

GSS

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Base Station System(BSS) BSS system needs to enhancement to recognize and

send packet data.

BSS includes BTS and MS.

Network Subsystem(NSS) It consist of a number of sgsns Also consist of a number of msc helps in – authentication, operation & maintenance of

subsystems

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SIM

ME

BTS

BTS

BSC

BSC

HLR HLR

HLR HLR

MSC SGSN GGSN

PSTN,ISDN,

PSPDNCSPD

N

BSS NSS

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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)

GATEWAY SUBSYSTEM Consist of sgsn & ggsn

Provide connections to other networks & pda

Pda – public data network

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GPRS other components Home Location Register(HLR): registers user profile

and responds to queries from GSNs .

Mobile Station(MS): it is the mobile phone or device

SMS Nodes: used for sms transmission via the SGSN

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Acronyms

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

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Conclusion

GPRS provides efficient access to Packet Data Networks.

Multislot operation in GPRS leads to efficient channel utilization.

GPRS is more effective for long data packet transmission than short ones.

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References Mobile Computing by Ashoke k Talukder

http://www.tutorialspoint.com/gprs/gprs_architecture.html

Mobile Communications by Jochen Schiller