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General Packet Radio Service

Module 3

BY:- GAURAV KUMAR

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Chapter

Topics to be covered in this session :-

Need Of GPRSGPRS Architecture

Session Objective

BY:- GAURAV KUMAR

GPRS Terminals

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GPRS

GPRS is a new bearer service for GSM

Packet Data Network (PDN) to the Internet.

BY:- GAURAV KUMAR

Short comings of existing cellular data services :Data rates are too slowConnection setup takes too long and complicatedService is too expensive for most users.

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GPRS Benefit

GPRS improves the utilization of the radio resources Offers volume-based billing Higher data transfer rates (Data Rate 14.4 115

kbps)

BY:- GAURAV KUMAR

or er access mes Simplifies the access to packet data networks New Data Services High Speed Efficient use of radio bandwidth Circuit switching & Packet Switching can be

used in parallel Constant connectivity

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GSM vs GPRS

GSM GPRS

Data Rate 9.6 Kbps 14.4 to 115.2 Kbps

Modulation Techniques GMSK GMSK

BY:- GAURAV KUMAR

Billing Duration ofconnection

Amount of datatransferred

Type of Connection CS technology PS

technology

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BSS

Same Radiofor Packetand Circuit

TrafficCircuit

Packets

BSC

GPRS System ArchitectureGPRS System Architecture

BY:- GAURAV KUMAR

GPRSPLMN

GSM PLMN

HLR

MSC/VLR

MSC

SGSN

SGSN

GGSN

SS7GGSN

X.25

IP

Intra

PLMN IPBackbone

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GPRS Network Elements

SGSN

Node serving multiple MS and BSS Establishes mobility management context Interfaces with HLR to perform security functions and

access control

BY:- GAURAV KUMAR

GPRS PLMNBSS

BSS

SGSNBSS GGSN

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GPRS Network Elements

GGSN

Gateway to the IP Packet Data Network Stores SGSN routing info for each GPRS user Stores specific information on IP addresses One PLMN may contain multiple GGSNs

BY:- GAURAV KUMAR

GPRS PLMN

IP

PDN

BSS

BSS

SGSN

SGSN

GGSN

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GPRS Terminals

Class A

MS supports simultaneous operation of GPRS andGSM services

BY:- GAURAV KUMAR

MS able to register with the n/w for both GPRS &

GSM services simultaneously. It can only use oneof the two services at a given time.

Class C - MS can attach for either GPRS or GSM services

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Ex : 1) Class 10 is also known as 4+2, means 4 slots to download

and 2 slots to upload, but no more than 5 slots used at a time.

For applications where data is sent back-and-forth in roughlyequal amount, such as instant messaging.

GPRS Speed & Profiles

BY:- GAURAV KUMAR

2) Class 8 is also known as 4+1, means 4 slots to downloadand 1 slot to upload

For applications where data is mostly downloaded,such as web browsing.

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GSM Location Area(LA) is divided into several Routing Areas(RA)

RA consists of several cells SGSN is informed when MS moves to a new RA MS sends a Routing Area Update Request to its assigned SGSN

Routing Area Update

BY:- GAURAV KUMAR

Types of Routing Area Update

Intra SGSN Routing Area Update

Inter SGSN Routing Area Update

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Protocol Architecture

BY:- GAURAV KUMAR

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Controls access attempts of an MS on radio channels shared byseveral MSs

Employs algos. for contention resolution, multiuser

Protocol Architecture

Medium Access Control

BY:- GAURAV KUMAR

Both ack and unack. Modes of operation are supported inRLC/MAC layer

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Establishes highly reliable logical link between MS & its assigned SGSN Works either in acknowledged or unacknowledged modes Data confidentiality is ensured by ciphering functions

Protocol Architecture

Medium Access Control

BY:- GAURAV KUMAR

Establish a reliable link between MS & BSSSegmentation and reassembly of LLC frames into RLC data blocks

Radio Link Control

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Used to transfer data packets between SGSN and MS Multiplexing of several connections of network layer onto one logical

connection of underlying LLC layer

Protocol Architecture

Sub Network Dependent Convergence Protocol

BY:- GAURAV KUMAR

Compression and decompression of user data and header informationData Link layer

Divided into two sub layers : LLC layer (between MS-SGSN) RLC/MAC (between MS-BSS)

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Delivers routing & Quality of Service related information between BSSand SGSN

BSS GPRS-Tunneling Protocol

Protocol Architecture

BY:- GAURAV KUMAR

GTP tunnels user data packets and related signalinginformation between GSNs

Signaling is used to create, modify and delete tunnels

Defined both at Gn and Gp interface Below GTP, TCP or UDP are employed to transport the GTPPackets within backbone network

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REVIEW

In this session we discussed about the:-

Need Of GPRSGPRS ArchitectureGPRS Terminals

BY:- GAURAV KUMAR

GPRS Protocols

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Presented By:- Gaurav Kumar

BY:- GAURAV KUMAR