EPFL • Cours “Mobile Networks”ica course - EPFL 21.… · • Cours “Mobile Networks ... UMTS principles Network Architecture WCDMA Basics General Protocols Model Radio Resource

• EPFL• Section Systèmes de Communication• Cours “Mobile Networks”

UMTS & New Technologies«Wireless data world»

Alexandre LEHERICEYRadio Access Engineering21/12/2004mailto: [email protected]

221/12/2004 A. LEHERICEY – UMTS course

UMTS courseIntroductionUMTS principles

Network ArchitectureWCDMA BasicsGeneral Protocols ModelRadio Resource Management and ATM transmission

UMTS EvolutionHSDPATDDAll IP

UMTS ProjectNetwork Architecture and DesignRolloutSystem Acceptance TestingNetwork PerformancesLaunch


Why a third Generation

GSM

TDMA GSM/GPRS171 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


Americas:GSMEDGE IS-136

China: GSMEDGE, WCDMA

SEAP: GSM

EDGE, WCDMA

Korea: WCDMA

Japan: WCDMA

Europe: GSM

EDGE, WCDMA

Why a third GenerationAir Interface: Bottleneck of the wireless systemsSeamless RoamingGlobal Solution


Key words: Services and...

Enjoy a large number of diversified services

Seamless access tomy services fromdifferent networks

Familiar "look and feel"of my services fromdifferent terminals

My services are availablewherever I am

My service profilecan be managed and configured by myself


...Quality Of Service

When comparing to GSM and other 2G cellular systems, 3G brings in a new aspect, QoS classification. The services offered can be divided into four different groups also called Traffic 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 is very delay sensitive and the Background Class traffic is very insensitive for delays.


3G Specification: 3GPP3GPP - Third GenerationPartnership ProjectARIB - Association of RadioIndustries and BusinessesCWTS - 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







Terminals Development

Pads / Telematics

Data Terminals Dual mode Phones

Multimedia terminals

Classic Terminals


Network Architecture

Circuit SwitchedCore Network

IN SCP

GGSN

3GSGSN

GPRS

USIM card

WCDMAmobile

GSM/WCDMAmobile

RAN

WCDMABTS

WCDMABTS

RNC

RNC

MSC

HLR

MediaGateway

SRR

PS Core Network

(PSTN/ISDN)

Internet(TCP/IP)GSM/WCDMA

mobile


Iu-PS

Iu-CS

Iu

Iur

IubUu

RAN Interfaces

4

Node B

Node B RNC

RNC

MGW

3G SGSN

MSC







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 2200EUROPE

UMTS FDD (UL) UMTS FDD (DL)UMTSTDD

UMTSTDD

MSS(UL)

MSS(DL)

MSS(DL)

MSS(UL)

MSS(UL)

MSS(DL)


FDD

Duplex method: FDDChannel spacing: 5 MHzCarrier chip rate: 3.84 McpsTime slot structure: 15 slots/frameFrame length: 10 msModulation: QPSKDetection: based on pilot symbolsIntra-frequency Handover: softInter-frequency Handover: hardSpreading factors: 4..512


WCDMA principle (1/6)WCDMA Carrier

5MHz

3.84MHz


WCDMA principle (2/6)Used Modulations

UEBS

Receiver

TransmitterQPSK

OQPSK


WCDMA principle (3/6)Multiple Access - CDMA

(Spreading)Codes

Power (P)

Time

Frequency

CDMA = Code Division Multiple Access


WCDMA principle (4/6)

+1

-1+1

-1+1

-1+1

-1+1

-1


WCDMA principle (5/6)Spreading Principle

ff

ff

User AUser A

User BUser B

DataData Data afterData afterspreadingspreading

PP

PP

TransmissionTransmissionover the airover the air

DespreadDespreadUser A signalUser A signalat the receiverat the receiver

ff

ff

ff ff


WCDMA principle (6/6)Codes and their Use

Channelisation code Scrambling codeUsage Uplink: separation of physical data /DPDCH) and

control channels (DPCCH) from same terminalDownlink: Separation of downlink connections to different users within one cell

Uplink: Separation of terminalDownlink: Separation of sectors (cells)

Length 4-256 chipsDownlink also 512 chips

Uplink: 10 ms=38400 chips or 66.7us=256 chipsDownlink: S10 ms=38400 chips)

Number of codes

Number of codes under one scrambling code=spreading factor

Uplink: Several millionsDownlink: 512

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

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

Documents

EPFL • Cours “Mobile Networks”ica course - EPFL 21.… · • Cours “Mobile Networks ... UMTS principles Network Architecture WCDMA Basics General Protocols Model Radio Resource