UMTS Evolution XIV 0405

8/8/2019 UMTS Evolution XIV 0405

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WS 04/05, TKN TU Berlin, Cornelia Kappler Course UMTS Networks, XIV. UMTS Evolution 1

Course Overview• Motivation

• Standardization issues

• UMTSarchitecture basics

• UMTSradio link – Physical layer

– Signaling

• UE,UTRAN,PSDomain,CSDomain

• Basicfunctionalities: – Accessing the network

– Transferringdata

– Detaching from the network

– Informationstorage• Mobility

• QoS

• Security

• IMS

• Charging

• UMTSEvolution:

from R99toRel7• Beyond UMTS




UMTS Evolution

• UMTSReleases Overview

• From GSMviaGPRStoUMTSR99

• Rel4Features• Rel5Features

• Rel6Features




UMTS Evolution - Literature

TS23.234„3GPPSystemtoWLANInterworking“

TS23.246„MultimediaBroadcast /Multicast Service(MBMS)

Supplementary Reading:

„InterworkingArchitecture between 3GPPandWLANSystems“

K.Ahmavaara etal.,IEEECommunication MagazineNov.2003




UMTS Releases Overview

• (almost)eachyear,anewReleaseoftheUMTS

standardispublished – UTMSisevolving

– firstUMTSReleaseis"R99“,finalizedin2000(not1999)

– subsequentlynumberedRel4,Rel5,...

– Rel7iscurrentlystarting




UMTS Evolution


• GSM->GPRS->UMTSR99->UMTSRel4





GSM -> GPRS -> UMTS R99 -> UMTS Rel4 I

• GSM

– CSdomain

– GSMRAN

• initially <10kb/s,evolved totoday (EDGE)384kb/s

• GPRS

– adds PSDomain,inparalleltoCSDomain

– Initially higher transmission rates than GSM(max 115kb/s)• can alsobe used with EDGE

– Shared radio channel (DSCH)=>more efficient usage ofradio resources,

because bandwidth demands ofe.g.webtraffic are highly fluctuating

(user needs timetoread page)andbursty

– allows adirect connection toe.g.the Internet

– charging perdata volume possible

• inGSMalways charging pertimeunit




• UMTSR99

– GSMRANreplacedbyUTRAN

• W-CDMA

• Higherbandwidth

– Upto2Mb/s

• Macrodiversity,soft(er)handover

• FunctionalitydifferentlydistributedcomparedtoGSMRAN – SupportforQoSclasses

• UMTSRel4 – SeparationofTransportandControlinCSdomain

– CSDomainmayalsobeIP-based

GSM -> GPRS -> UMTS R99 -> UMTS Rel4 II




UMTS Evolution







Rel5 Features• IMS

• Layer 2between RNCandGGSNnot necessarily ATM-based

• FlexibleRANs – Mayattach GSMRANandGERANtoPSdomain(see next slide)

• GERAN=GSMEDGERadioAccessNetwork

– The properterm torefer toasystem including GERANandGSMRANis „3GPPnetwork“rather than „UMTSnetwork“

• UMTSnetwork implies UTRAN

• Iu Flex

– Breaking hierarchical mapping ofRNCs toSGSNs (MSCs)

• HDSPA(HighSpeedDownlinkPacketAccess)

– NewSharedChannelondownlink

– Upto16Mb/s




Rel5 Features – Flexible RANs

Internet Intranet

GSM

Radio

UTRAN

PSTN

/ISDN

Gb/Iu ps

Application

Server (AS)HLR

GSM / UMTS Core Network

CSCF

to UE viaconnectivity service

HSS

GERAN

CS-GWIP

CS domain

SGSNGi

GGSN

CSCF

MRF

CS-MGW MGW

GMSC-S.MSC-S. SGW

PS domain

IP or ATM

Mg

Nc

McMc

Mw

Cx

Mm

Nb

Mr

Gn

to SGSN,MSC-S.,GMSC-S.

to CSCF ( SIP ), SGSN,MSC-S., GMSC-S.

Iu ps/Iu cs

Gb/A

A/

Iu cs

A/Iu cs

Gb/A/Iu cs/Iu ps

transport

control

IMS

Go

IP

COPS

SIP

SIP

SIP

SIP




Rel5 Features – Iu Flex I

• UptoRel5,RNCtoSGSNrelationhierarchical

– EachRNCisassignedtoexactlyoneSGSN

– EachSGSNservesoneormoreRNCs

GGSN

RNC

SGSN

SGSN

RNC

RNC

RNC




Rel5 Features – Iu Flex II• Iu Flexallowsmany-to-manyrelationofRNCs andSGSNs (andMSCs)

– RNCs andSGSNs groupedasbelongingto“PoolAreas”

– APoolAreaisservedbyoneormoreSGSNs inparallel. – AllthecellscontrolledbyaRNCbelongtothesameone[ormore]

PoolArea[s].

– UEmayroaminPoolAreawithoutneedtochangetheservingSGSN.

GGSN

RNC

SGSN

SGSN

RNC

RNC

RNC

Pool Area 1

Pool Area 2

Overlap of

Pool Areas 1 and 2

SGSNSGSNs

serving

Pool Area 1

SGSN

serving

Pool Area 2




Rel5 Features: HDSPA I

• HDSPAFeatures

– Newshareddownlinkchannel:

HS-DSCH(High-SpeedDownlinkChannel)

• Associatedwithitup- anddownlinkfeedback/controlchannels

• CanbeallocatedtoasinglePDPcontextortomultiplePDP

contextsofseveralsuscribers

– Canaccommodatepeek-ratesupto16Mb/s – Sustainedratesof1– 5Mb/s

(dependingoncellsize)




Rel5 Features: HDSPA II• TechnicalRealisation

– 16QAMmodulationusedinadditiontoQPSK

• Codes4bitsperphase/amplitudeshift

– NodeBbasedscheduling

• Reducesdelay – E.g.retransmissionshandledmorequickly

– NodeBbasedadaptationcoderateandmodulation

• Dependingoncurrentlynecessarythroughputadaptcoderateandmodulationscheme

– WithoutHDSPAcoderatefixedpersession

⇒ optimizethroughput

− HybridARQ

− Upondetectionofframeerrors,receiverrequestsretransmission (normalARQ)

− Informationencodedredundantlyineachtransmission.Retransmissiondoesn’t

resendcompleteinformation,butonlysomemoreredundancy,complementingtheredundantdatathathasalreadybeensent(HybridARQ)

− TurboCodes

− Powerfulerrorcorrecting/encodingschemesuitedforlowsignal-noiseratios




Rel5 Features: HDSPA III




UMTS Evolution







Rel6 Features – Overview I•NetworkSharing

–Allowcostefficientsharingofnetworkresources

•Scenario1:Multiplecorenetworkssharingcommonradioaccessnetwork(alreadyinR99)

•Scenario2:Geographicallysplitnetworkssharing•Scenario3:CommonNetworkSharing

•Scenario4:Commonspectrumnetworksharing

•Scenario5:Multipleradioaccessnetworkssharingcommoncorenetwork

•IMSServices

•MBMS(MultimediaBroadcast andMulticast Service)

•WLANinterworking

– use WLANasaccess network for IMSinstead ofPSDomain

•MIMO

–Multipleantennas inUEandNode B/spacial multiplexing

•andmany more…




Rel6 Features – IMS Services I• PushService

– Seestudent presentation

• IMSGroupManagement – Setting upandmaintaining user groups

– Supporting service for other services• Multipartyconferencing

• Push-to-talk

• Etc.

• IMSPresence Service – Seestudent presentation




Rel6 Features – IMS Services II•IMSMessaging

–SIP-based messaging

–Instant messaging,„Chatroom“,anddeferred messaging (equivalent toMMS)

–Interworks with Presence Servicetodetermine whether addressee available

•Multiparty-multimedia conferencing service inIMS – utilizing MRF

•

•Push-to-talk

– see student presentation

•

•Location-based services inIMS

–UEindicates it wishes touse local service.S-CSCFroutes request backtovisited

network

–Mechanism for UEtoretrieve /receive information about locally available services




Rel6 Features – MBMS I

• MBMS- MultimediaBroadcast andMulticast Service

• Enablesresourceandcostefficientdatatransfertomany

usersinparallel

• Applications

– Multicastofe.g.sportevents

– Broadcastofemergencyinformation

– Downloadofsoftware(games) – Multipartyconferencing

– Push-to-talk

• “streamingtypereception”:

presentdataasitisreceived

• “downloadtypereception”:

storedataandreplaylater




Rel6 Features – MBMS II

MBMSAppli-cation

UE

MBMSBearer

Service

GGSN

Application

Server

e.g.BMSC

Gmb (AAA protocol)

Gi (IP multicast)

MBMS User Service

SGSN

RAN

MBMS data distribution tree

MBMS bearer service control

• Howdoesitwork

– Applicationserversubmitsmulticast/broadcastdataviaGi interface

• MaybeBMCS(BroadcastMulticastServiceCenter),ore.g.MRF

• Multicasteffectiveespeciallyonairinterface – ControlchannelviaGmb interface

• Authorisation,sendingencryptionkeys,…

• Networkresourceconfiguration

– Inmulticastmode,dataistransmittedonlytocellswithUEs that joinedtheservice




Rel6 Features: WLAN interworking I• Use WLANasaccess network• WLANoperated either by 3GPPoperator or by 3rdparty

• 6scenarios are defined:

– Scenario1:Commonbillingandcustomercare

• Receiveonlyonebill

– Scenario2:Commonaccesscontrol(authenticationandauthorisation)usinga

(U)SIMbasedsolutionandcharging

– Scenario3:Accesstoall3GPPpacket-switchedservices

(e.g.,IMS,Pushetc.)andserviceslikeSMSorMMS

– Scenario4:ServicecontinuitybetweendifferentaccesseslikeWLANand

UTRAN(i.e.servicemustnotbeset-upagain,ifaccesstechnologyis

changed)

– Scenario5:

SeamlessmobilitybetweenWLANand3GPPaccessnetworks

– Scenario6:SeamlesshandoverevenforCSservices

• InRel6,onlyscenarios1-3aresupported

• InRel7,WiMAX interworkingforseen additionally




Rel6 Features: WLAN interworking II

• Architectureforsupportingauthentication,authorization

andcharging(scenarios1and2)

– AAAServerisanIETF-standardizedentitydoing

“authentication,authorization,accounting” – AAAServerreceivesdatafromHSS/HLR

– WLANUEs

• multihomed withWLANand3GPPaccesscapability

• ContainUSIM

– USIMinWLANUEallowsusing3GPPsubscription

3GPP Home Network

WLAN Access NetworkWLAN

UE

Ww 3GPP AAA

Server

HSS / HLR

ChargingWa

Intranet / Internet

USIM




Rel6 Features: WLAN interworking III

• Architectureforsupportingaccessto3GPPpacket-

switchedservices(Scenario3)

Ww

3GPP Home Network

WLAN Access NetworkWLANUE

3GPP AAA

Server Packet DataGateway

HSS / HLR

Intranet / Internet

3GPP Visited Network

3GPP AAA

ProxyCharging

WAGWn

W a

W d

W p

Wm

W i

S c e n a r i o 3

W g

Wu Charging




Rel6 Features: WLAN interworking IV

• UEisauthenticatedbyProxyAAAServerinvisitednetworkrelayingdatatoAAAServerinhomenetwork

• PDG(PacketDataGateway)

– AtunnelisestablishedbetweenUEandPDG

– PDGprovidesaccessto3GPPservices(e.g.IMS)

– PDGactsasPolicyEnforcementPointforServiceBasesLocalPolicy(similartoGGSN)

• WAG(WLANAccessGateway)

– GatewaytoWLAN,i.e.allpacketsto/fromWLANroutedviaWAG

– EnforcesroutingofpacketstoPDG




Summary

• UMTSR99(comparedtoGPRS)

– GSMRANreplacedbyUTRAN

– SupportforQoSclasses

• UMTSRel4

– Nomajorchangestopacket-basedpart

• UMTSRel5 – IMS

– HDSPA

– Iu Flex• UMTSRel6

– WLANInterworking

– Numerousservicesarebeingdefined

Documents

UMTS Evolution XIV 0405