2.7-UMTS Course - EPFL 21.12.04 Part 1-1
Transcript of 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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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
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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
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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Terminals Development
Pads / Telematics
Data TerminalsDual modePhones
Multimedia terminals
ClassicTerminals
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Network Architecture
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
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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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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WCDMA principle (2/6)
Used Modulations
UE
BS
Receiver
TransmitterQPSK
OQPSK
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WCDMA principle (3/6)
Multiple Access - CDMA
(Spreading)Codes
Power (P)
Tim
Frequency
CDMA = Code Division Multiple Access
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WCDMA principle (4/6)
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WCDMA principle (5/6)
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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WCDMA principle (6/6)
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