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Course Overview Motivation

Standardization issues

UMTSarchitecture basics

UE,UTRA,UTRAN,PSDomain

Basicfunctionalities

Mobility

QoS

Security andcharging IMS

Example signaling flows

Businessconsiderations

UMTS- what comes next?

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Architecture

Node B RNC

Protocols

cf.TS25.401"UTRANoverall description",

TS25.301"RadioInterfaceProtocol Architecture"

UMTS Radio Access Network (UTRAN)

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UTRAN Architecture Node B

responsible for radio transmission /reception inone or more cells

RNC- RadioNetworkController

controlsuse andintegrity ofradio resources

controlsone or more Node Bs

RNS- RadioNetworkSubsystem

contains one RNCandaset ofcells

RNS

RNC

RNS

RNC

Core Network (PS Domain and CS Domain)

Node B Node B Node B Node B

Iups / Iucs

Iur

Iub IubIub Iub

UTRAN

UE

Uu

Iups / Iucs

cell

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Architecture

Node B RNC

Protocols

cf.TS25.401"UTRANoverall description"

UMTS Radio Access Network (UTRAN)

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Node B Functionality

Spreading andModulation

code generation

supports FDD,TDDor both,andCDMA Terminates Physical Channels

andTransportChannels

Logical Channels terminate atRNC Fastpower control ("InnerLoop")

Node Bmeasures strengths ofreceived signals and

informs UEif it needs toadjust measures connection quality andstrength

handover necessary?

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Architecture

Node B RNC

Protocols

cf.TS25.401"UTRANoverall description"

UMTS Radio Access Network (UTRAN)

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RNC Functionality I RadioResource Managementguarantees stability andQoSofradio connection(radio bearer)

Powercontrol ("outer loop") Handover control

should there be ahandover?

decide based onmeasurements by UEandNode B

Admission control andpacketscheduling

can anew session be established onthe UTRAwithout compromising the quality ofexisting sessions?

Planchannel use,calculate interference andutilisation levels

Configure radio resources accordingly

Codemanagement

Macrodiversity management

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RNC Functionality II UTRAControlset-up,maintainance andrelease ofradio connection (radio bearer)

Systeminformation broadcasting

e.g.radio measurement criteria,... InitialAccessandSignaling Connection set-up andmanagement

synchronization,broadcast ofinitialscrambling code,...

UTRANsecurity functions

protects user andcontrol data by encryption andintegrity protection

UTRANlevel mobility management

informing new cell (Node B)andUEabout handover,new channel,etc

Serving RNSrelocation

Databasehandling

stores cell information,andsends it tocorresponding Node Bs andUEs cell identity,power levels,connection qualities,neighboring cell information (needed forhandover)

UEpositioning

selects andcontrolsUEpositioning method

using cell ID,round-trip times,"angle-of-arrival",GPS,...

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RNC Functionality III - Relocation Foreach UE,one RNCis responsible - Serving RNC(SRNC)

typically this is the RNCcontrolling the cell inwhich the UEis located

If the UEmoves toacell controlled by adifferentRNC,this becomes

the DriftRNC(DRNC)

control stays with SRNC

AlsoMacrodiversity may introduce DRNCs

SRNCmay relocate control toDRNCviaIur

now former DRNCbecomes SRNC

useful for optimizing routing (data always travels viaSRNC)

SRNC

Core Network

Iu

DRNCIur

UE

Cells

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Illustration

Node Bs RNC

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Architecture

Node B RNC

Protocols

cf.TS25.401"UTRANoverall description"

UMTS Radio Access Network (UTRAN)

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Protocols on Uu Interface I

L3

Logical Channels

Control-plane signalling User-plane information

PHY L1

L2

MAC

BMC

controlRRC

RLC

PDCP

Transport Channels

Legend see next slide

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Protocols on Uu Interface II

PHY

tasks that are directly related tothe air interface

(de)multiplexing oftransport channels tophysical channels

providing transport channels tothe layer above

messaging onsynchronization,macrodiversity,fastpower control

reporting ofconditions onradio interface (handover necessary?)

error protection

MAC

tasks that related tomapping between logical channels and

transport channels

(de)multiplexing oflogical channels totransport channels

providing logical channels

packetscheduling /priority control

possibly encryption (unless done onRLC)

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Protocols on Uu Interface IV RRC- RadioResource Control

control andconfiguration ofprotocol stack onUu Interface

there is one RRCconnection for each UE,which controlsthe radio linkfor all

sessions ofthis UE

convenient incase ofhandover

hascontrol interfaces toallother radio linkprotocols

FDDfrequency management

mobility management

outer loop power control

collection ofmeasurement from lower layers

broadcast ofsystem information

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Summary UTRANis home to

Node B

radio transmission /reception inone or more cells

terminates (most)physical channels

RNC

controlsuse andintegrity ofradio resources

controlsone or more Node Bs

terminates logical channels UEcontrolled by SRNC,however data may alsotravel viaDRNC

InterfacesUu,Iu,Iub,Iur

Protocols used onUu

MACandRLConL2for both control anduser plane

PDCPandBMConL2additionally for user planetoPSDomain

RRConL3for control plane

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Accumulated Abbreviations I1G,2G,3G1stGeneration,...3rdGeneration3GPP 3rdGenerationPartnership Project,produces UMTSstandard

3GPP2 3rdGenerationPartnership Project2,produces cdma2000standard

AuC Authentication Center

B3G Beyond 3rdGeneration

BCCH Broadcast Control Channel,one ofthe logical radio channels

BCH Broadcast Channel,one ofthe transport radio channelsBMC Broadcast andMulticast Control,Layer 2protocol onUu

BSC BaseStationController,controlling node inGSMRAN

BTS BaseStationTransceiver,network element,incl antenna inGSMRAN

CCCH CommonControl Channel,one ofthe logical radio channels

CDMA CodeDivisionMultipleAccess;each user (application)uses different"code"onthe radio interface

cdmaOne Oneofthe 2ndGenerationSystems,mainly used inAmericas andKorea,uses CDMAcdma2000 member ofthe IMT-2000family for 3G,successor ofcdmaOne

CN Core Network;inUMTSconsisting ofCSDomain,PSDomainandIMS

CTCH CommonTransportChannels,one ofthe logical radio channels

CPICH CommonPilotChannel,one ofthe physical radio channels

CSDomainCircuit-switched Domain,one ofthe UMTSfunctional groups

DCCH Dedicated Control Channel,one ofthe logical radio channels

DCH Dedicated Channel,one ofthe transport radio channels

DPICH Dedicated PilotChannel,one ofthe physical radio channels

DRNC DriftRNC

DSCH Downlink Shared Channel,one ofthe transport radio channels

DTCH Dedicated TransportChannels,one ofthe logical radio channels

EDGE Enhanced Data Ratesfor GSMEvolution

EIR EquipmentIdentity Register

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Accumulated Abbreviations IIFDD Frequency Divsion Duplex;uplink anddownlink use differentfrequencies onthe radio interfaceFDMA Frequency DivisionMultipleAccess;each user (application)uses differentfrequency onthe radio

GGSN Gateway GPRSSupportNode,network element inthe PSdomain

GMSC Gateway MSC,network element inCSDomain,gateway toexternal networks

GPRS GeneralPacketRadioService,2.5Generationsystem

GSM GlobalSystemfor MobileCommunications,European2GSystem

HLR HomeLocation Register,main subscriber database inGSMandGPRS

HSCSD Hich Speed Circuit Switched Data,higher data ratefor GSM

ID InternetDraft,working document ofthe IETF,becomes RFCwhen generally accepted

IETF InternetEngineeringTaskForce,responsible for InternetStandardization

IMS IPMultimediaSubsystem,one ofthe UMTSfunctional groups

IMT-2000 InternationalMobileTelecommunicationsat2000MHz,3GconceptbyITU

IS-95 =cdmaOne,one ofthe 2ndGenerationSystems

ITU InternationalTelecommunication Union,internationalstandardization body

Iu Reference Pointbetween CNandRNC

Iub Reference Pointbetween RNCandNode B

Iur Reference Pointbetween RNCs

L1,L2,.. OSILayer 1,Layer 2...

MS MobileStation(term used inGSMandGPRS)

MSC MobileSwitching Center,network element inCSDomain

P-CCPCH Primary CommonControl Physical Channel,one ofthe physical radio channels

PCCH Paging Control Channel,one ofthe logical radio channels

PDCP PacketData Control Protocol,L2protocol onUu

P-SCH Primary Synchronization Channel,one ofthe physical radio channels

PSDomainPacket-switched Domain,one ofthe UMTSfunctional groups

PSTN PublicSwitched TelephoneNetwork

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Accumulated Abbreviations IIIQoS Quality ofService

QPSK Quaternary PhaseShift Keying,ModulationTechnique used inUMTS

R99 UMTSRelease1999

RAN RadioAccessNetwork

RFC "Request ForComment",Specification by IETF

Rel4,Rel5..UMTSRelease4,..

RLC RadioLinkControl Layer,L2Protocol onUuRNC RadioNetworkController

RNS RadioNetworkSubsystemSDMA Space DivisionMultipleAccess

RRC RadioResource Control,Control PlaneProtocol onL3ofUu

SGSN Serving GPRSSupportNode

SRNC Serving RNC

TDD TimeDivisionDuplex;uplink anddownlink use differenttimeslots onthe radio interfaceTDMA TimeDivisionMultipleAccess;each user (application)uses differenttimeslot onthe radio

TRAU Transcoding andRateAdaptationUnit

TS Technical Specification,Standardby 3GPP

UE UserEquipment(term used inUMTS)

UMTS UniversalMobileTerrestial System,member ofthe IMT-2000family for 3G,successor ofGSM

UTRA UMTSRadioAccess;Radiolinkbetween UTRANandUEUTRAN UMTSRadioAccessNetwork

Uu Reference Pointbetween UEandUTRAN

VLR Visited Location Register,network element inGSMandGPRS,stores user data invisited network