3gpp core network evolution & terminals 2010
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3GPPCoreNetworkEvolution & Terminals
HannuHietalahti
hannu.hietalahti@nokia.com
3GPP 2009 Mobile World Congress, Barcelona, 19th February 2009
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KeyfeaturesofEPC EPCkeywords Keyfeatures
CoreNetworkInteroperabilityand2G/3Gintegration
CSandPSvoiceservicecapabilities Emer enc callsinLTE
Emergencycallrouting CSFallback(CSFB)
SingleRadioVoiceCallContinuity(SRVCC)
DualStackIPv4/6connectivit
Home
(e)NodeB Publicwarningsystem
LTEdeploymentscenarios
Multimodenetworkselection ANDSF
Local
IP
Access
(LIPA)
WLANoffloading
MultiplePDNConnectionstoSameAPN(MUPSAP)
QoSmanagement
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erm na n a e o
NetworkinitiatedQoS
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EPCkeywords
Keyfeatures
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Flat PSonl architecture
UTRANHSPA
HSPA +
MobilitybetweenaccessUTRAN
EDGE GSM 900
GSM 1800
GSM 1900
Optimisedmobilitywithlegacycellularsystems,includingCDMA
GERAN
Interoperabilitywithnon3GPPaccesstechnologies
LTE2600 LTE
Interopera i ity
Multiplesecuritymechanisms HRPD
1xRTT
rus e an un rus e access Non-3GPPAccess
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WLAN802.16
WIMAX
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EndtoendIPbasedsystem Dua stac IPv4an IPv6support
NetworkinitiatedQoS
Supportoftrafficoffloadingtooptimisecostperbit Interoperabilitywithlegacycellularsystems
SupportofHome(e)NodeB=FemtoCell
Regulatory
grade
emergency
call
support PublicWarningSystem
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CoreNetworkinteroperabilityand
2G/3Gintegration
an vo ceserv cecapa t es
EmergencycallsinLTEEmergencycallrouting
CSFallback(CSFB)
SingleRadioVoiceCallContinuity(SRVCC)DualStackIPv4 6connectivit
Home(e)NodeB
LTEdeploymentscenarios
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device has multiple Operator Network decides,
IMS, VoIP, SR-VCC, etc. Can VoIP
be used now?
preferences todevice (CS or
IMS or both)
w e er o o erincoming call via
PS or CS
e worUE signals its capabilities to the
network during LTE attach
Network analysesreceived UE
information the UEmakes decision to useeither CS or IMS for
information, its owntechnical cabilities and
policies and informsthe UE on VoIP
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support
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EmergencycallsinLTE
RegulatoryemergencycallrequirementsaresupportedinRel9inPSdomain DetectionofemergencynumbersinUE In icationan prioritisationo emergencyca s Locationservices,bothforroutinganduserlocationdataforPSAP
Callbackispossible,butprocessedasnormalcall
EmergencynumberlistintheUEiscommonforCSandPSdomainuse Default112and911(+localconfigurationviaUSIMpreconfiguration+download) Incaseofmatch,theUEshallinitiatethecallasanemergencycall
UE
translates
dialed
number
into
emergency
service
request ServiceURNwithatoplevelservicetypeof"sos"asspecifiedinRFC 5031 Emergencycategorycanindicateemergencyserviceifknown(fire,ambulance,police,..)
e wor can e ec emergencyca sno awareo oca emergencynum er UEdoesnothavefullinformationofalllocalemergencycallnumbersandinitiatesa
normalcall
FromEPCperspective,itwillbeanormalPDNconnectionBenefitoflocationinformation PCSCFdiscoversthecorrectregionalPSAPtotaketheemergencycall PSAPgetsinformationonthepreciseuserlocation
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1.Emergencyattachforprioritisedconnectivity
toemergencyAPN
2.IMSemergencyregistration
3.PCSCFdetectsemergencyRURIand
routesINVITEtoECSCF
MME HSS
-
4.ECSCFqueriestheUElocationandroutesto
a ro riate PSAP
LTEServing PDN P-CSCF E-CSCF
Default bearer for signaling
Dedicated bearer for media
MGCFMGW.
establishedforvoice
6.PSAPmayalsoenquire
emergencyservicetorightstreetaddressSignaling
Usermedia(voice)
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PSAP
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CSFallBackfromEPStoCSdomain
CSFBreusesvoiceandotherCSdomainservicesprovidedbylegacyCS
infrastructurere rec s e o oma n or serv ces
SMScanbedeliveredtotheUEwithoutredirectingtoCSDomain
AfterCSservicetheUEcanreturntoLTEdependingoncoverageandpolicy
UsercandecidewhethertoacceptCSFBrequestornotApplicationofCSFB:
capa e ev cecamp ngon ce canes a s rece ve serv ces
ReuseofexistingCSinfrastructureforvoiceserviceuntilIMSVoIPisdeployed
ProvidevoiceroamingsupportwithLTE upport us ngex st ng n rastructure
Rel9IMSprovidesfullemergencycallsupport RequiresoverlappingCSdomaincoverage
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MME
DirectingtheUEfromLTEto2G/3GforCSservice
paging
SETUP
GSM/EDGE
PLMN serving
remote userpaging
WCDMA
paging resp.SETUP
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MSC
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IMScallcancontinueisCSdomainoutsideofLTEcoveragearea
SRVCCtoCSdomainisinvokedifVoIPcallcannotcontinueviaPSPSHO On yHOo asing evoice earer romPStoCSisspeci ie Requiresoverlappingwith1xRTT/GSM/WCDMAcoverage
SRVCCvoicecallsareanchoredinIMS
One
way
HO
from
PS
to
CS
systems
(LTE
to
GSM/UMTS
or
to
1xRTT)
Nosimultaneousoperationofdifferentradiotransceiversisneeded
Rel9SRVCCim rovements IMSsupportofmidcallservices(e.g.,HOLD,MPTY) SRVCCsupportforemergencycalls
,optimisationsarebeingstudiedinRel10
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SRVCCprocedure
IMS
TransferfromLTEto2G/3Gwithactivecall(notallentitiesshown)
HO required
MME
HO command
LTEmeasurementsrelocationrequest
relocation
PLMN serving
response
sessiontransfer
WCDMAMSC server
prepare HO
HO complete
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DualstackIPv4 6connectivitGPRSandEPS
TwoparallelPDPcontexts(IPv4andV6)towardssingleAPNinPrerelease8GPRS
MigrationtoIPv6isstudiedin3GPPTR23.975inRel10
CurrentEPSandGPRSspecificationsalreadysupportDSconnectivity
ToolsforIPv4andIPv6coexistenceandsubsequenttransitiontoIPv6arealreadyprovided
DSconnectivitymayrequiretheuseofprivateIPv4addressingwithinthenetwork
EPSnetworkprovidesIPv4andIPv6coexistencebasedonDSconnectivity
Interoperability
towards
legacy
GPRS
can
be
provided
via
parallel
V4
and
V6
contexts
HSS
UTRAN/GERANGn/Gp
Gr
Single-stack PDP contexts ORDual-stack PDP Context (R9)
Gn
S1-MME
S6a
MME
SGi
Gn
(Gx)
E-UTRAN
S11
S5Operator IP
(Rx)
S1u
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Single-stack EPS Bearers OR
Dual-stack EPS Bearer (R9)
SGWOther IP Services
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FemtoCellin3GPPisrealizedviaHomeNodeB
EnhancedaccesscontrolforhomeCell AutomaticaccesscontrolinUEviaClosedSubscriberGroup
AllowedCSGlistispreconfiguredbytheoperatororbytheuser
Automaticcell re selectiontoallowedhomecellswhenavailable
Adhocvisitorscanalsofindthehomecell Accessissubjecttoaccesscontrol
Applicableon3G(HNodeB)andLTE(HeNodeB)
Legacy3Gmobilesdetecthomecell,butconsideritnormalcell
LocalBreakoutispossible
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PWSisglobalpublicalertingsystem
CurrentapplicationsareUSCMASandJapaneseETWS
Themechanismisextendable(EUAlertisunderconsideration)
Notificationprovideroutsidetheoperatornetwork
BothHPLMNandroamingsubscribersarecovered
Differentlanguages Differentalertcategories
Eventdescription
Affectedarea Recommendedaction
Expirationtime
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LTEdataoverlappingwith2G/3G CSFBforvoiceservicesin2G/3G
AddingLTEto2G/3Gnetwork
LTEdata+IMSvoiceoverlappingwith2G/3G
CSFB,SRVCCfromLTEto2G/3G
a a vo cerefarming2G/3Gfrequencies
SRVCCfrom2G/3GtoLTE
Femto cells
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CSGandhomecellsupportforLTEand3G
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u mo ene wor se ec on
ANDSFoca ccess
SelectiveIPTrafficOffloading(SIPTO)
o oa ng
MultiplePDNConnectionstoSameAPN(MUPSAP)
(Someoftheseareunderremotecontroloftheoperator)
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Multimodenetworkselection
Networkselectioncomprisestwoparts
Thegoal,basedoncommercialagreements
Home
operator
determines
the
preferred
visited
operators
Themeans,basedontechnicalcriteria
Servingvisitedoperatordeterminesaccesstechnology,frequencybandandcell
PLMNselectionisbasedonITUTdefinedMobileCountryCode(MCC)andMobileNetworkCode(MNC)anditcanbeextendedtoanysystemsupportingMCC+MNC
Commonnetworkselectionrulesareastrengthof3GPPsystem
Economies
of
scale
via
common
UE
logic
to
adapt
to
different
network
configurations Automaticroamingtothebestavailableoperator(basedonsubscriptiontoHPLMN)
AutomaticroamingtothebestavailableRAT(basedonservingoperatorsconfiguration)
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Se ectiono non3GPPANcan eoptimise viaANDSFpo icy
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Networkselection,
HPLMNHPLMN has
not confi ured
HPLMNisnotavailable
RAT priority forthis VPLMN
withnoassociatedRATinPLMNselectorwithaccess
technology:
Selector(USIM):
VPLMN5
VPLMN1CDMA
sno ava a e VPLMN1isavailable VPLMN2isavailable
VPLMN2isselectedvia2G
VPLMN1 VPLMN1
VPLMN1
3GorEUTRAN USIMconfiguredRAT
preferencepossible
-
?
idlemodeisresumed Cell&RATmaychange
within
the
selected
PLMN
VPLMN2VPLMN2GERAN
nter pr or ty Backgroundscanforhigher
prioritynetwork
UTRAN
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RAT=RadioAccessTechnology,
PLMN=PublicLandMobileNetwork E-UTRAN
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ccess e wor scovery e ec on unc on Optimisesnon3GPPaccesstechnologyselection
DoesnotaffecttheselectionofthePLMNoperator
ANselectionpolicycanbedownloadedfromthenetwork EitherHPLMNorVPLMNpolicy
S14H-ANDSF
MultiplepoliciescanexistbutjustoneisactiveatanytimePolicyattributes
VPLMN
HPLMN
o cypr or ty Accesspriority
ValidityareaS14
UE V-ANDSF
3GPP IP Access orTrusted/Untrusted
Non-3GPP IPAccess
PLMN Timeofday Discoveryinformation
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All traffic
on 3GPP
LIPAisprimarilyforendusersbenefit,toallowaccesstolocal
residentialorcorporatenetworkthrougha3GPPdevice
radio, ,
buttheendusermayhavetoselectLIPAaccess
Home(e)NodeBmayadvertisetheavailableLIPAaccess(tbd.)
Mobileoperators
corenetwork
Local IP traffic
IP traffic to mobile operatorsCN
Residential/
UE
LIPAprovidesaccessforIPcapableUEsthatareconnectedvia
aH(e)NBsubsystem(i.e.usingH(e)NBradioaccess)tootherIP
capableentitiesinthesameresidential/enterpriseIPnetwork.
enterprise
IP Network
networkandLocalIPAccesstoaresidential/enterpriseIP
networkwillbesupported.
AUEmusthaveavalidsubscriptionwiththemobileoperator
logical connection for mobileo erator IP traffic
.
AUEmustbeabletouseLocalIPAccessinavisitednetwork
subjecttoroamingagreementbetweenmobileoperators.
PreRel10UEsshouldbeabletouseLocalIPAccess.
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scope of Local IP access
Signalingwisetheoperatorgainsorsavesnothing,butLIPA
makestheoperatorsHomeCellmoreattractivetotheuser!
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Optimisingcostperbitisbecomingessentialintheflatrateera
SIPTO is a s ecific routin scenario within the o erators network allowin selective
offloadingofthetrafficawayfromtheEvolvedPacketCorenetwork
Selectiveoffloadinge.g.basedontheQoSneedsoftheservice
SIPTOisintendedforallowingcostoptimizedhandlingoftheinternettrafficthatisnot
intendedfortheoperatorscorenetwork(i.e.,operatorservices)
CN
SIPTO TrafficAll traffic
on 3GPP
RAN
L-PGWMME
S11S5
S5
UE
eNB P-GWS-GW
CN Traffic
S1-U
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BaselineapproachforSIPTOaboveRANscenario.LocalGWisselectedforthetraffictobeoffloaded
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WLANoffloadingreferstothedualradioscenariowherepartofthetraffic(PDN
connections,IPflows)isroutedviaWLANaccessandpartvia3GPPaccess
AssumesaUEcapableofoperatingWLANand3GPPradiossimultaneously
The3GPPEvolvedPacketCorenetwork(EPC)asthecommoncorenetworkservesboth
WLANoffloadingcoversboththescenariowherethetrafficviaWLANradioisanchored
intheEPC(i.e.,seamlessoffloading)andthescenariowhereitisnotanchored(i.e.,non
AccessNetworkDiscoveryandSelectionFunction(ANDSF)istheretoprovidetheUE
withtheaccessnetworkdiscoveryinformationandthepolicyonhowtousethe
Availableaccessnetworks
PreferredroutingofthetrafficperAPN,perIPflow
EPCANDSF HA
Thereisnomobilitysupportin3GPPnetwork
forflowsoffloadedinnonseamlessway
WLAN 3GPP
RAT
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MUPSAP MultiplePDNConnectionstotheSameAPNfor
PMIPbasedInterfaces
GTP basedcorenetworkinterfaces Gn GpandGTPS5 S8 support
multiplePDNconnectionstothesameAPN
Usecase:canbeestablishedduetodualstackconnectivity(v4+v6)
Usecase:dialupcasewheretheterminalactsasamodemforaTEwhilstmaintainingaPDNconnectionofitsowninparallel
samecapabilitiestoallcorenetworkprotocols.
ForPMIPS5/S8,thePDNGWcandifferentiatethePDNconnectionstothesame ase on e earer en ys gna e y e erv ng
ForPMIPbasedS2aandS2b,thePGWcandifferentiateparallelconnectionsto
the
same
APN
based
on
specific
identifier
assigned
and
signalled
by
MAG
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erm na n a e o
Network
initiated
QoS
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Rel6GPRSnegotiationcontainsallthenecessaryparameterstodetermineQoS,but OnlyveryfewUEapplicationscanindicatetheirQoSneedstotheUEprotocollayers ny o reques rom e mus econs ere aga ns rea eres r c ons
SubscribedmaximumQoS Availablecapacityinthenetworkandradiointerface
ParallelPDPcontextwiththesameUE+IPversiontothesameAPNisconsideredanerror n t ate o snotw e yuse an npract ce su scr e o context suse
Noalwaysonbearerafterattach
HLR
SubscribedQoS
UTRAN SGSN GGSN PDN services
GMMAttachAccept
ActivatePDPContextRequest
Activate PDP Context Acce t IPAddr.
UEcanrequestanyQoS(butonlyifthe
applicationisabletotellwhatitneeds)
UsuallythenetworkgivesthesubscribedQoS
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ImprovementsinEPSQoSnegotation Defaultbearer isassignedduringattachandprovidesalwaysonIPconnectivity
, , .
Dedicatedbearer isassignedonlywhenneededtoprovideguaranteedbitrateQoScontrol AssignedonlyforthoseQoSsensitiveapplicationsthatcanberecognised
Rel8allowsalso2G/3GGPRStousetheEPSprincipleofnetworkinitiatedQoSnegotiation QoSdifferentiationimprovescostefficiencyviaassigningQoSonlywhenneeded
Differentservicepackagingandprioritiesarepossible
MappingofdifferentapplicationstodifferentbearerpinpointsQoStotheapplicationsthatneedsit
OperatorcontrolonQoSisimprovedviaenablingdifferentdeploymentmodels Userdifferentiation(differentusershavedifferentsubscribedQoS)
Servicedifferentiation(differentidentifiedserviceshavedifferentQoS) MixtureofuserbaseddefaultQoSenhancedbyservicebasedQoSforidentifiedhigherQoSneeds
MMEHSSS1-MME
S6a
S11
LTEServingGW
PDNGW
IP services
Default bearer: Network initiated and alwa s on
,
S1-U S5 SGi
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Endofpresentation
moreinformationatwww.3 .or
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