2.7-umts course - epfl 21.12.04 part 1-1

8/8/2019 2.7-UMTS Course - EPFL 21.12.04 Part 1-1

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EPFL

Section Systmes de Communication Cours Mobile Networks

UMTS & New TechnologiesWireless data world

Alexandre LEHERICEYRadio Access Engineering21/12/2004

mailto: [email protected]


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221/12/2004 A. LEHERICEY UMTS course

UMTS course

Introduction

UMTS principles

Network Architecture

WCDMA Basics General Protocols Model

Radio Resource Management and ATM transmission

UMTS Evolution

HSDPA TDD

All IP

UMTS Project

Network Architecture and Design

Rollout

System Acceptance Testing

Network Performances

Launch


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Why a third Generation

GSM

TDMA GSM/GPRS

171 kbps

3G Phase 1 Networks Evolved 3G Networks2G First Steps to 3G

Multiradio GSM Network

TDD/

All IP

HSDPAWCDMA

GSM/GPRS/EDGE

10 Mbps2 Mbps

473 kbps

AMPS

EFREFR

AMRAMR

EAMREAMR

384 Kbps


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Americas:GSM

EDGE IS-136

China: GSM

EDGE, WCDMA

SEAP: GSM

EDGE, WCDMA

Korea: WCDMA

Japan: WCDMA

Europe: GSM

EDGE, WCDMA

Why a third Generation

Air Interface: Bottleneck of the wireless systems

Seamless Roaming

Global Solution


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Key words: Services and...

Enjoy a large number of diversified services

Seamless access tomy services fromdifferent networks

Familiar "look and feel"ofmy services fromdifferent terminals

My services areavailablewherever I am

My service profilecan be managedand configured by myself


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...Quality Of Service

When comparing to GSM and other 2G cellular systems, 3G

brings in a new aspect, QoS classification. The servicesoffered can be divided into four different groups also calledTraffic Classes. Those are:

Conversational (e.g. speech and video Telephony)

Streaming (e.g. listening to music and watching video)

Interactive (e.g. Internet based shopping)

Background (e.g. downloading mail)

This division aims to take into account how delay sensitivethe traffic in each class is. The Conversational Class traffic isvery delay sensitive and the Background Class traffic is very

insensitive for delays.


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3G Specification: 3GPP

3GPP - Third GenerationPartnership Project

ARIB - Association of RadioIndustries and Businesses

CWTS - China WirelessTelecommunication StandardgroupETSI - EuropeanTelecommunicationsStandards InstituteT1 - Standards Committee T1TelecommunicationsTTA - TelecommunicationsTechnology AssociationTTC - TelecommunicationTechnology Committee

GSM - Global System forMobile CommunicationsUMTS - Universal MobileTelecommunications System

IETF - Internet EngineeringTask ForceITU-R - InternationalTelecommunication Union -RadiocommunicationITU-T - InternationalTelecommunication Union -TelecommunicationStandardization


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UMTS course

Introduction

UMTS principles




UMTS Evolution

HSDPA TDD

All IP

UMTS Project


Rollout



Launch


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Terminals Development

Pads / Telematics

Data TerminalsDual modePhones

Multimedia terminals

ClassicTerminals


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Circuit SwitchedCore Network

IN SCP

GGSN

3GSGSN

GPRS

USIMcard

WCDMAmobile

GSM/WCDMAmobile

RAN

WCDMABTS

WCDMABTS

RNC

RNC

MSC

HLR

MediaGateway

SRR

PS Core Network

(PSTN/ISDN)

Internet(TCP/IP

)GSM/WCDMAmobile


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Iu-PS

Iu-CS

Iu

Iur

IubUu

RAN Interfaces

4

Node B

Node BRNC

RNC

MGW

3G SGSN

MSC


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UMTS course

Introduction

UMTS principles




UMTS Evolution

HSDPA

TDD

All IP

UMTS Project


Rollout



Launch


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Frequency Allocation

1800 1900 2000 2100 2200 MHz

1885 1980 2010 2025 2110 2170 2200

A B C A B CD EF D FE

PCS

1850 1870 1895 1910 1930 1950 1975 1990

MDS

USA

ITU/RRS5.388

GSM1800(DL)

PCSFDD(UL)

*

WLLFDD(UL)

*

IMT2000(UL)

PCSFDD(DL)

*

WLLFDD(DL)

*

MSS(UL)

IMT2000TDD

IMT2000(DL)

WLLTDD

Ext.GSM1800?

1805 1850 1865 1880 1900 1920 1945 1960 1980 2010 2025 2110 2170 2200 MHz

* Reserved, not assigned to an operator

WLL TDD(SCDMA)1800-1805

MSS(DL)

CHINA

DECTGSM1800(DL)

1880 1900 1980 2010 2025 2110 2170 2200

EUROPEUMTS FDD (UL) UMTS FDD (DL)

UMTSTDD

UMTSTDD

MSS(UL)

MSS(DL)

MSS(DL)

MSS(UL)

MSS(UL)

MSS(DL)


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FDD

Duplex method: FDD Channel spacing: 5 MHz

Carrier chip rate: 3.84 Mcps

Time slot structure: 15 slots/frame

Frame length: 10 ms

Modulation: QPSK

Detection: based on pilot symbols

Intra-frequency Handover: soft Inter-frequency Handover: hard

Spreading factors: 4..512


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WCDMA principle (1/6)

WCDMA Carrier

5MHz

3.84MHz


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Used Modulations

UE

BS

Receiver

TransmitterQPSK

OQPSK


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Multiple Access - CDMA

(Spreading)Codes

Power (P)

Tim

Frequency

CDMA = Code Division Multiple Access


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+1

-1

+1

-1

+1

-1

+1

-1+1

-1


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Spreading Principle

ff

ff

User AUser A

User BUser B

DataData Data afterData after

spreadingspreading

PP

PP

TransmissionTransmission

over the airover the air

DespreadDespread

User A signalUser A signal

at the receiverat the receiver

ff

ff

ff ff


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Codes and their Use

Channelisation code Scrambling code

Usage Uplink: separation of physical data /DPDCH) andcontrol channels (DPCCH) from same terminal

Downlink: Separation of downlink connections to

different users within one cell

Uplink: Separation of terminalDownlink: Separation of sectors

(cells)

Length 4-256 chips

Downlink also 512 chips

Uplink: 10 ms=38400 chips or

66.7us=256 chips

Downlink: S10 ms=38400 chips)

Number of

codes

Number of codes under one scrambling

code=spreading factor

Uplink: Several millions

Downlink: 512

Code family Orthogonal Variable Spreading Factor Long 10 ms code: Gold codeShort code: Extended S(2) code

family

Spreading Yes, increases transmission bandwidth No, does not affect transmission

bandwidth

2.7-umts course - epfl 21.12.04 part 1-1

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