Gprs

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General Packet Radio Service Mario Baldi
(Technical University of Torino) mario.baldi[at]polito.it staff.polito.it/mario.baldi © M. Baldi: see page 2

GPRS

Politecnico di Torino

Copyright Notice
This set of transparencies, hereinafter referred to as slides, is protected by copyright laws and provisions of International Treaties. The title and copyright regarding the slides (including, but not limited to, each and every image, photography, animation, video, audio, music and text) are property of the authors specified on page 1. The slides may be reproduced and used freely by research institutes, schools and Universities for non-profit, institutional purposes. In such cases, no authorization is requested. Any total or partial use or reproduction (including, but not limited to, reproduction on magnetic media, computer networks, and printed reproduction) is forbidden, unless explicitly authorized by the authors by means of written license. Information included in these slides is deemed as accurate at the date of publication. Such information is supplied for merely educational purposes and may not be used in designing systems, products, networks, etc. In any case, these slides are subject to changes without any previous notice. The authors do not assume any responsibility for the contents of these slides (including, but not limited to, accuracy, completeness, enforceability, updated-ness of information hereinafter provided). In any case, accordance with information hereinafter included must not be declared. In any case, this copyright notice must never be removed and must be reported even in partial uses. GPRS - 2 © M. Baldi: see page 2

Generalities
Based on the existing GSM infrastructure Packet switching functionality Better data transfer rates Statistical multiplexing
Traffic based billing

Migration Path to 3G Networks
GPRS - 3 © M. Baldi: see page 2

Service Types
Point-to-Point
Internet access by user

Point-to-Multipoint
Delivery of information (e.g. news) to multiple locations or interactive conference applications

GPRS - 4

© M. Baldi: see page 2

Circuit Switched Data (CSD)
Before GPRS A channel is allocated to user for duration of connection Inefficient use of resources Time-based billing Deterministic quality of service Resources allocated to communication Suitable to real-time applications GPRS - 5 © M. Baldi: see page 2

In GPRS
Resources are allocated to user only for the time it takes to send each packet A channel may be shared by many users User pays by the packet Ideal for “data” traffic

GPRS - 6

© M. Baldi: see page 2

Comparison
CSD Lower bit rates 14.4kbit/s Reserved bandwidth Fixed access time Time-based billing GPRS Higher bit rates up to 170kbit/s Shared bandwidth Variable access times Traffic based billing

GPRS - 7

© M. Baldi: see page 2

GSM Network Architecture
BSC MS BTS PSTN ISDN

GMSC MSC

BTS MS BTS
GPRS - 8

BSC

EIR MS

AUC

HLR

VLR

© M. Baldi: see page 2

Acronyms
MS: Mobile Station BSC: Base Station Controler BTS: Base Transciever Station MSC: Mobile Switching Controler GMSC: Gateway Mobile Switching Controler PSTN: Public Switched Telephone Network GPRS - 9 © M. Baldi: see page 2

Acronyms
VLR: Visited Location Register EIR: Equipment Identity Register AUC: Authentication center HLR: Home Location Register PLMN: Public Land Mobile Network E.g., GSM network

PDN: Packet Data Network
E.g., IP network, Internet, intranet
GPRS - 10 © M. Baldi: see page 2

GPRS Architecture
SMS-GMSC SMS-INMSC Gd SGSN Gp

Other GPRS PLMN

GGSN Gb Gf BTS BSC Gs Gc BTS MS EIR D
GPRS - 11

Gn

GGSN

Gr PDN Gi

HLR

MSC/VLR

© M. Baldi: see page 2

GPRS Architecture
New components
SGSN: Serving GPRS Support Node GGSN: Gateway GPRS Support Node

Components needing upgrade
HLR MSC/VLR Mobile Station
GPRS - 12 © M. Baldi: see page 2

SGSN
Delivers data packets from and to mobile stations Packet...
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