Self-organization in Ad Hoc Networks Jean-Pierre Hubaux EPFL lcaepfl.ch/hubaux
EPFL • Cours “Mobile Networks”ica course - EPFL 21.… · • Cours “Mobile Networks ......
Transcript of EPFL • Cours “Mobile Networks”ica course - EPFL 21.… · • Cours “Mobile Networks ......
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• EPFL• Section Systèmes de Communication• Cours “Mobile Networks”
UMTS & New Technologies«Wireless data world»
Alexandre LEHERICEYRadio Access Engineering21/12/2004mailto: [email protected]
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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
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321/12/2004 A. LEHERICEY – UMTS course
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
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421/12/2004 A. LEHERICEY – UMTS course
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
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521/12/2004 A. LEHERICEY – UMTS course
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
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621/12/2004 A. LEHERICEY – UMTS course
...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.
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721/12/2004 A. LEHERICEY – UMTS course
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
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821/12/2004 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
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921/12/2004 A. LEHERICEY – UMTS course
Terminals Development
Pads / Telematics
Data Terminals Dual mode Phones
Multimedia terminals
Classic Terminals
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1021/12/2004 A. LEHERICEY – UMTS course
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
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1121/12/2004 A. LEHERICEY – UMTS course
Iu-PS
Iu-CS
Iu
Iur
IubUu
RAN Interfaces
4
Node B
Node B RNC
RNC
MGW
3G SGSN
MSC
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1221/12/2004 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
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1321/12/2004 A. LEHERICEY – UMTS course
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)
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1421/12/2004 A. LEHERICEY – UMTS course
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
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1521/12/2004 A. LEHERICEY – UMTS course
WCDMA principle (1/6)WCDMA Carrier
5MHz
3.84MHz
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1621/12/2004 A. LEHERICEY – UMTS course
WCDMA principle (2/6)Used Modulations
UEBS
Receiver
TransmitterQPSK
OQPSK
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1721/12/2004 A. LEHERICEY – UMTS course
WCDMA principle (3/6)Multiple Access - CDMA
(Spreading)Codes
Power (P)
Time
Frequency
CDMA = Code Division Multiple Access
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1821/12/2004 A. LEHERICEY – UMTS course
WCDMA principle (4/6)
+1
-1+1
-1+1
-1+1
-1+1
-1
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1921/12/2004 A. LEHERICEY – UMTS course
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
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2021/12/2004 A. LEHERICEY – UMTS course
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