3GPPTS23.501V16.4.0(2020-03)

TechnicalSpecification

3rdGenerationPartnershipProject;

TechnicalSpecificationGroupServicesandSystemAspects;

Systemarchitectureforthe5GSystem(5GS);

Stage2

(Release16)

Thepresentdocumenthasbeendevelopedwithinthe3rdGenerationPartnershipProject(3GPPTM)andmaybefurtherelaboratedforthepurposesof3GPP.

Thepresentdocumenthasnotbeensubjecttoanyapprovalprocessbythe3GPPOrganizationalPartnersandshallnotbeimplemented.

ThisSpecificationisprovidedforfuturedevelopmentworkwithin3GPPonly.TheOrganizationalPartnersacceptnoliabilityforanyuseofthisSpecification.

SpecificationsandReportsforimplementationofthe3GPPTMsystemshouldbeobtainedviathe3GPPOrganizationalPartners'PublicationsOffices.

STYLEREFZA

3GPPTS23.501V16.4.0(2020-03)

PAGE

5

STYLEREFZGSM

Release16

3GPP

Keywords

3GPP,Architecture,5GSystem,NextGen

3GPP

Postaladdress

3GPPsupportofficeaddress

650RoutedesLucioles-SophiaAntipolis

Valbonne-FRANCE

Tel.:+33492944200Fax:+33493654716

Internet

CopyrightNotification

Nopartmaybereproducedexceptasauthorizedbywrittenpermission.

Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.

?2020,3GPPOrganizationalPartners(ARIB,ATIS,CCSA,ETSI,TSDSI,TTA,TTC).

Allrightsreserved.

UMTS?isaTradeMarkofETSIregisteredforthebenefitofitsmembers

3GPP?isaTradeMarkofETSIregisteredforthebenefitofitsMembersandofthe3GPPOrganizationalPartners

LTE?isaTradeMarkofETSIregisteredforthebenefitofitsMembersandofthe3GPPOrganizationalPartners

GSM?andtheGSMlogoareregisteredandownedbytheGSMAssociation

Contents

TOC\o"1-9"

Foreword

16

1 Scope

17

2 References

17

3 Definitionsandabbreviations

21

3.1 Definitions

21

3.2 Abbreviations

26

4 Architecturemodelandconcepts

29

4.1 Generalconcepts

29

4.2 Architecturereferencemodel

29

4.2.1 General

29

4.2.2 NetworkFunctionsandentities

30

4.2.3 Non-roamingreferencearchitecture

30

4.2.4 Roamingreferencearchitectures

34

4.2.5 DataStoragearchitectures

37

4.2.5a RadioCapabilitiesSignallingoptimisation

39

4.2.6 Service-basedinterfaces

40

4.2.7 Referencepoints

40

4.2.8 Supportofnon-3GPPaccess

42

General

42

GeneralConceptstoSupportTrustedandUntrustedNon-3GPPAccess

43

A GeneralConceptstosupportWirelineAccess

44

ArchitectureReferenceModelforTrustedandUntrustedNon-3GPPAccesses

45

.1 Non-roamingArchitecture

45

.2 LBORoamingArchitecture

46

.3 Home-routedRoamingArchitecture

48

ReferencePointsforNon-3GPPAccess

50

.1 Overview

50

.2 RequirementsonTa

51

ArchitectureReferenceModelforWirelineAccessnetwork

51

Accessto5GCfromdevicesthatdonotsupport5GCNASoverWLANaccess

52

.1 General

52

.2 ReferenceArchitecture

53

.3 NetworkFunctions

53

.4 ReferencePoints

53

4.2.9 NetworkAnalyticsarchitecture

54

4.2.10 ArchitectureReferenceModelforATSSSSupport

54

4.3 InterworkingwithEPC

55

4.3.1 Non-roamingarchitecture

55

4.3.2 Roamingarchitecture

56

4.3.3 Interworkingbetween5GCvianon-3GPPaccessandE-UTRANconnectedtoEPC

58

Non-roamingarchitecture

58

Roamingarchitecture

59

4.3.4 InterworkingbetweenePDGconnectedtoEPCand5GS

61

Non-roamingarchitecture

61

Roamingarchitectures

62

4.3.5 ServiceExposureinInterworkingScenarios

64

Non-roamingarchitecture

64

Roamingarchitectures

65

4.4 Specificservices

66

4.4.1 PublicWarningSystem

66

4.4.2 SMSoverNAS

66

ArchitecturetosupportSMSoverNAS

66

ReferencepointtosupportSMSoverNAS

68

ServicebasedinterfacetosupportSMSoverNAS

68

4.4.3 IMSsupport

68

4.4.4 Locationservices

68

ArchitecturetosupportLocationServices

68

ReferencepointtosupportLocationServices

68

ServiceBasedInterfacestosupportLocationServices

68

4.4.5 ApplicationTriggeringServices

69

4.4.6 5GLAN-typeServices

69

Userplanearchitecturetosupport5GLAN-typeservice

69

Referencepointstosupport5GLAN-typeservice

69

4.4.7 MSISDN-lessMOSMSService

69

4.4.8 TimeSensitiveCommunication

70

General

70

ArchitecturetosupportTimeSensitiveCommunication

70

5 Highlevelfeatures

71

5.1 General

71

5.2 NetworkAccessControl

71

5.2.1 General

71

5.2.2 Networkselection

71

5.2.3 Identificationandauthentication

72

5.2.4 Authorisation

72

5.2.5 Accesscontrolandbarring

72

5.2.6 Policycontrol

73

5.2.7 LawfulInterception

73

5.3 RegistrationandConnectionManagement

73

5.3.1 General

73

5.3.2 RegistrationManagement

73

General

73

5GSRegistrationManagementstates

73

.1 General

73

.2 RM-DEREGISTEREDstate

73

.3 RM-REGISTEREDstate

74

.4 5GSRegistrationManagementStatemodels

74

RegistrationAreamanagement

75

SupportofaUEregisteredoverboth3GPPandNon-3GPPaccess

76

5.3.3 ConnectionManagement

77

General

77

5GSConnectionManagementstates

78

.1 General

78

.2 CM-IDLEstate

78

.3 CM-CONNECTEDstate

78

.4 5GSConnectionManagementStatemodels

79

.5 CM-CONNECTEDwithRRCInactivestate

79

NASsignallingconnectionmanagement

81

.1 General

81

.2 NASsignallingconnectionestablishment

82

.3 NASsignallingconnectionRelease

82

SupportofaUEconnectedoverboth3GPPandNon-3GPPaccess

82

5.3.4 UEMobility

82

MobilityRestrictions

82

.1 General

82

.2 ManagementofServiceAreaRestrictions

84

MobilityPattern

85

RadioResourceManagementfunctions

86

UEmobilityeventnotification

86

5.4 3GPPaccessspecificaspects

87

5.4.1 UEreachabilityinCM-IDLE

87

General

87

UEreachabilityallowingmobileterminateddatawhiletheUEisCM-IDLE

88

MobileInitiatedConnectionOnly(MICO)mode

88

5.4.2 UEreachabilityinCM-CONNECTED

89

5.4.3 Pagingstrategyhandling

90

General

90

PagingPolicyDifferentiation

90

PagingPriority

91

5.4.4 UERadioCapabilityhandling

91

UEradiocapabilityinformationstorageintheAMF

91

a UEradiocapabilitysignallingoptimisation(RACS)

92

Void

94

a UERadioCapabilityMatchRequest

94

Pagingassistanceinformation

95

5.4.4a UEMMCoreNetworkCapabilityhandling

95

5.4.4b UE5GSMCoreNetworkCapabilityhandling

96

5.4.5 DRX(DiscontinuousReception)framework

96

5.4.6 CoreNetworkassistanceinformationforRANoptimization

96

General

96

CoreNetworkassistedRANparameterstuning

97

CoreNetworkassistedRANpaginginformation

98

5.4.7 NG-RANlocationreporting

98

5.4.8 Supportforidentificationandrestrictionofusingunlicensedspectrum

98

5.4.9 WakeUpSignalAssistance

99

5.5 Non-3GPPaccessspecificaspects

100

5.5.0 General

100

5.5.1 RegistrationManagement

100

5.5.2 ConnectionManagement

100

5.5.3 UEReachability

102

UEreachabilityinCM-IDLE

102

UEreachabilityinCM-CONNECTED

102

5.6 SessionManagement

102

5.6.1 Overview

102

5.6.2 InteractionbetweenAMFandSMF

105

5.6.3 Roaming

107

5.6.4 SinglePDUSessionwithmultiplePDUSessionAnchors

108

General

108

UsageofanULClassifierforaPDUSession

109

UsageofIPv6multi-homingforaPDUSession

110

5.6.5 SupportforLocalAreaDataNetwork

112

5.6.6 Secondaryauthentication/authorizationbyaDN-AAAserverduringtheestablishmentofaPDUSession

114

5.6.7 ApplicationFunctioninfluenceontrafficrouting

115

General

115

EnhancementofUPpathmanagementbasedonthecoordinationwithAFs

120

5.6.8 SelectiveactivationanddeactivationofUPconnectionofexistingPDUSession

121

5.6.9 SessionandServiceContinuity

122

General

122

SSCmode

122

.1 SSCMode1

122

.2 SSCMode2

123

.3 SSCMode3

123

SSCmodeselection

123

5.6.10 SpecificaspectsofdifferentPDUSessiontypes

124

SupportofIPPDUSessiontype

124

SupportofEthernetPDUSessiontype

124

SupportofUnstructuredPDUSessiontype

126

MaximumTransferUnitsizeconsiderations

127

5.6.11 UEpresenceinAreaofInterestreportingusagebySMF

127

5.6.12 UseofNetworkInstance

129

5.6.13 Always-onPDUsession

129

5.6.14 SupportofFramedRouting

129

5.7 QoSmodel

130

5.7.1 GeneralOverview

130

QoSFlow

130

QoSProfile

131

a AlternativeQoSProfile

131

ControlofQoSFlows

131

QoSRules

132

QoSFlowmapping

132

DLtraffic

134

ULTraffic

134

AMBR/MFBRenforcementandratelimitation

135

PrecedenceValue

135

5.7.2 5GQoSParameters

135

5QI

135

ARP

136

RQA

136

Notificationcontrol

136

.1 General

136

.1a NotificationControlwithoutAlternativeQoSProfiles

137

.1b NotificationcontrolwithAlternativeQoSProfiles

137

.2 UsageofNotificationcontrolwithAlternativeQoSProfilesathandover

138

FlowBitRates

139

AggregateBitRates

139

Defaultvalues

139

MaximumPacketLossRate

140

Wirelineaccessnetworkspecific5GQoSparameters

140

5.7.3 5GQoScharacteristics

140

General

140

ResourceType

141

PriorityLevel

141

PacketDelayBudget

141

PacketErrorRate

142

AveragingWindow

142

MaximumDataBurstVolume

143

5.7.4 Standardized5QItoQoScharacteristicsmapping

143

5.7.5 ReflectiveQoS

147

General

147

UEDerivedQoSRule

148

ReflectiveQoSControl

148

5.7.6 PacketFilterSet

149

General

149

IPPacketFilterSet

150

EthernetPacketFilterSet

150

5.8 UserPlaneManagement

151

5.8.1 General

151

5.8.2 FunctionalDescription

151

General

151

UEIPAddressManagement

151

.1 General

151

.2 Routingrulesconfiguration

153

.3 TheprocedureofStatelessIPv6AddressAutoconfiguration

154

ManagementofCNTunnelInfo

154

.1 General

154

.2 Void

154

.3 ManagementofCNTunnelInfointheUPF

154

TrafficDetection

155

.1 General

155

.2 TrafficDetectionInformation

155

ControlofUserPlaneForwarding

155

.1 General

155

.2 DataforwardingbetweentheSMFandUPF

156

.3 SupportofEthernetPDUSessiontype

156

ChargingandUsageMonitoringHandling

157

.1 General

157

.2 ActivationofUsageReportinginUPF

157

.3 ReportingofUsageInformationtowardsSMF

158

PDUSessionandQoSFlowPolicing

158

PCCRelatedFunctions

158

.1 Activation/DeactivationofpredefinedPCCrules

158

.2 EnforcementofDynamicPCCRules

159

.3 Redirection

159

.4 SupportofPFDManagement

160

FunctionalityofSendingof"Endmarker"

160

.0 Introduction

160

.1 UPFConstructingthe"Endmarker"Packets

160

.2 SMFConstructingthe"Endmarker"Packets

161

0 UPTunnelManagement

161

1 ParametersforN4sessionmanagement

161

1.1 General

161

1.2 N4SessionContext

162

1.3 PacketDetectionRule

163

1.4 QoSEnforcementRule

166

1.5 UsageReportingRule

169

1.6 ForwardingActionRule

172

1.7 UsageReportgeneratedbyUPF

175

1.8 Multi-AccessRule

176

1.9 BridgeManagementInformation

177

1.10 PortManagementInformationContainer

177

1.11 SessionReportingRule

177

1.12 SessionreportinggeneratedbyUPF

178

2 ReportingoftheUEMACaddressesusedinaPDUSession

178

3 Supportfor5GVNgroupcommunication

178

3.0 General

178

3.1 Supportforunicasttrafficforwardingofa5GVN

179

3.2 SupportforunicasttrafficforwardingupdateduetoUEmobility

181

3.3 Supportforuserplanetrafficreplicationina5GVN

181

4 InterPLMNUserPlaneSecurityfunctionality

183

5.8.3 ExplicitBufferManagement

183

General

183

BufferingatUPF

183

BufferingatSMF

184

5.8.4 SMFPauseofCharging

184

5.9 Identifiers

184

5.9.1 General

184

5.9.2 SubscriptionPermanentIdentifier

184

5.9.2a SubscriptionConcealedIdentifier

185

5.9.3 PermanentEquipmentIdentifier

185

5.9.4 5GGloballyUniqueTemporaryIdentifier

185

5.9.5 AMFName

186

5.9.6 DataNetworkName(DNN)

186

5.9.7 Internal-GroupIdentifier

186

5.9.8 GenericPublicSubscriptionIdentifier

187

5.9.9 AMFUENGAPID

187

5.9.10 UERadioCapabilityID

187

5.10 Securityaspects

188

5.10.1 General

188

5.10.2 SecurityModelfornon-3GPPaccess

188

SignallingSecurity

188

5.10.3 PDUSessionUserPlaneSecurity

188

5.11 SupportforDualConnectivity,Multi-Connectivity

190

5.11.1 SupportforDualConnectivity

190

5.12 Charging

190

5.12.1 General

190

5.12.2 UsageDataReportingforSecondaryRAT

191

5.12.3 SecondaryRATPeriodicUsageDataReportingProcedure

191

5.13 SupportforEdgeComputing

191

5.14 PolicyControl

192

5.15 Networkslicing

192

5.15.1 General

192

5.15.2 IdentificationandselectionofaNetworkSlice:theS-NSSAIandtheNSSAI

193

General

193

StandardisedSSTvalues

194

5.15.3 Subscriptionaspects

194

5.15.4 UENSSAIconfigurationandNSSAIstorageaspects

195

General

195

.1 UENetworkSliceconfiguration

195

.2 MappingofS-NSSAIsvaluesintheAllowedNSSAIandintheRequestedNSSAItotheS-NSSAIsvaluesusedintheHPLMN

197

UpdateofUENetworkSliceconfiguration

197

5.15.5 DetailedOperationOverview

198

General

198

SelectionofaServingAMFsupportingtheNetworkSlices

198

.1 RegistrationtoasetofNetworkSlices

198

.2 ModificationoftheSetofNetworkSlice(s)foraUE

202

.3 AMFRe-allocationduetoNetworkSlice(s)Support

204

EstablishingaPDUSessioninaNetworkSlice

204

5.15.6 NetworkSlicingSupportforRoaming

205

5.15.7 NetworkslicingandInterworkingwithEPS

206

General

206

Idlemodeaspects

206

Connectedmodeaspects

206

5.15.8 ConfigurationofNetworkSliceavailabilityinaPLMN

207

5.15.9 Operator-controlledinclusionofNSSAIinAccessStratumConnectionEstablishment

207

5.15.10 NetworkSlice-SpecificAuthenticationandAuthorization

208

5.16 Supportforspecificservices

209

5.16.1 PublicWarningSystem

209

5.16.2 SMSoverNAS

210

General

210

SMSoverNAStransport

210

5.16.3 IMSsupport

210

General

210

IMSvoiceoverPSSessionSupportedIndicationover3GPPaccess

210

a IMSvoiceoverPSSessionSupportedIndicationovernon-3GPPaccess

211

HomogeneoussupportforIMSvoiceoverPSSessionsupportedindication

211

P-CSCFaddressdelivery

212

DomainselectionforUEoriginatingsessions/calls

212

TerminatingdomainselectionforIMSvoice

213

UE'susagesetting

213

DomainandAccessSelectionforUEoriginatingSMS

213

.1 UEoriginatingSMSforIMSCapableUEssupportingSMSoverIP

213

.2 AccessSelectionforSMSoverNAS

213

SMFsupportforP-CSCFrestorationprocedure

214

0 IMSVoiceServiceviaEPSFallbackorRATfallbackin5GS

214

1 P-CSCFdiscoveryandselection

214

2 HSSdiscoveryandselection

215

5.16.4 EmergencyServices

215

Introduction

215

ArchitectureReferenceModelforEmergencyServices

217

MobilityRestrictionsandAccessRestrictionsforEmergencyServices

217

ReachabilityManagement

218

SMFandUPFselectionfunctionforEmergencyServices

218

QoSforEmergencyServices

218

PCCforEmergencyServices

218

IPAddressAllocation

218

HandlingofPDUSessionsforEmergencyServices

219

a HandlingofPDUSessionsfornormalservicesforEmergencyRegisteredUEs

219

0 SupportofeCallOnlyMode

219

1 EmergencyServicesFallback

219

5.16.5 MultimediaPriorityServices

220

5.16.6 MissionCriticalServices

221

5.17 InterworkingandMigration

222

5.17.1 SupportforMigrationfromEPCto5GC

222

General

222

UserPlanemanagementtosupportinterworkingwithEPS

224

5.17.2 InterworkingwithEPC

224

General

224

InterworkingProcedureswithN26interface

227

.1 General

227

.2 MobilityforUEsinsingle-registrationmode

228

InterworkingProcedureswithoutN26interface

229

.1 General

229

.2 MobilityforUEsinsingle-registrationmode

230

.3 MobilityforUEsindual-registrationmode

230

.4 RedirectionforUEsinconnectedstate

231

Mobilitybetween5GSandGERAN/UTRAN

232

5.17.3 InterworkingwithEPCinpresenceofNon-3GPPPDUSessions

232

5.17.4 NetworksharingsupportandinterworkingbetweenEPSand5GS

232

5.17.5 ServiceExposureinInterworkingScenarios

233

General

233

SupportofinterworkingforMonitoringEvents

233

.1 InterworkingwithN26interface

233

.2 InterworkingwithoutN26interface

234

AvailabilityorexpectedlevelofaserviceAPI

234

5.17.6 Void

234

5.17.7 ConfigurationTransferProcedurebetweenNG-RANandE-UTRAN

235

ArchitecturePrinciplesforConfigurationTransferbetweenNG-RANandE-UTRAN

235

Addressing,routingandrelaying

236

.1 Addressing

236

.2 Routing

236

.3 Relaying

236

5.18 NetworkSharing