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TS 23.501SA2
System Architecture for the 5G System

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V16.4.0 (Wzip)2020/03  430 p.
V15.9.0 (PDF)2020/03  251 p.

WI Acronym:  5GS_Ph1
Rapporteur:  Ms. Chandramouli, DevakiNokia Germany

Service-based representation of the 5G Core architecture
5G-EIR (5G-Equipment Identity Register) – AF (Application Function) – AMF (Access and Mobility Management Function) – AUSF (Authentication Server Function) – CHF (Charging Function) – DN (Data Network) – NF (Network Function) – NEF (Network Exposure Function) – NRF (Network Repository Function) – NSSF (Network Slice Selection Function) – NWDAF (Network Data Analytics Function) – PCF (Policy Control Function) – (R)AN ((Radio) Access Network) – SCP (Service Communication Proxy) – SMF (Session Management Function) – SMSF (Short Message Service Function) – UDM (Unified Data Management) – UDSF (Unstructured Data Storage Function) – UPF (User Plane Function) – UDR (Unified Data Repository) –

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The present document defines the Stage 2 system architecture for the 5G System. The 5G System provides data connectivity and services. This specification covers both roaming and non-roaming scenarios in all aspects, including interworking between 5GS and EPS, mobility within 5GS, policy control and charging, and authentication. TS 23.502 contains the stage 2 procedures and flows for 5G System and it is a companion specification to this specification.

essential Table of Contents for  TS 23.501  Word version:   16.4.0

each title links to the equivalent title in the full Contents
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1  ScopeWord-p. 17
2  ReferencesWord-p. 17
3  Definitions and abbreviationsWord-p. 21
4  Architecture model and conceptsWord-p. 29
4.1  General conceptsWord-p. 29
4.2  Architecture reference modelWord-p. 29
4.2.1  GeneralWord-p. 29
4.2.2  Network Functions and entitiesWord-p. 30
4.2.3  Non-roaming reference architectureWord-p. 30
4.2.4  Roaming reference architecturesWord-p. 34
4.2.5  Data Storage architecturesWord-p. 37
4.2.5a  Radio Capabilities Signalling optimisation [R16]Word-p. 39
4.2.6  Service-based interfacesWord-p. 40
4.2.7  Reference pointsWord-p. 40
4.2.8  Support of non-3GPP accessWord-p. 42
4.2.9  Network Analytics architectureWord-p. 54
4.2.10  Architecture Reference Model for ATSSS Support [R16]Word-p. 54
4.3  Interworking with EPCWord-p. 55
4.3.1  Non-roaming architectureWord-p. 55
4.3.2  Roaming architectureWord-p. 56
4.3.3  Interworking between 5GC via non-3GPP access and E-UTRAN connected to EPCWord-p. 58
4.3.4  Interworking between ePDG connected to EPC and 5GSWord-p. 61
4.3.5  Service Exposure in Interworking Scenarios [R16]Word-p. 64
4.4  Specific servicesWord-p. 66
4.4.1  Public Warning SystemWord-p. 66
4.4.2  SMS over NASWord-p. 66
4.4.3  IMS supportWord-p. 68
4.4.4  Location servicesWord-p. 68
4.4.5  Application Triggering ServicesWord-p. 69
4.4.6  5G LAN-type Services [R16]Word-p. 69
4.4.7  MSISDN-less MO SMS Service [R16]Word-p. 69
4.4.8  Time Sensitive Communication [R16]Word-p. 70
5  High level featuresWord-p. 71
5.1  GeneralWord-p. 71
5.2  Network Access ControlWord-p. 71
5.3  Registration and Connection ManagementWord-p. 73
5.4  3GPP access specific aspectsWord-p. 87
5.5  Non-3GPP access specific aspectsWord-p. 100
5.6  Session ManagementWord-p. 102
5.7  QoS modelWord-p. 130
5.8  User Plane ManagementWord-p. 151
5.9  IdentifiersWord-p. 184
5.10  Security aspectsWord-p. 188
5.11  Support for Dual Connectivity, Multi-ConnectivityWord-p. 190
5.12  ChargingWord-p. 190
5.13  Support for Edge ComputingWord-p. 191
5.14  Policy ControlWord-p. 192
5.15  Network slicingWord-p. 192
5.16  Support for specific servicesWord-p. 209
5.17  Interworking and MigrationWord-p. 222
5.18  Network SharingWord-p. 236
5.19  Control Plane Load Control, Congestion and Overload ControlWord-p. 239
5.20  External Exposure of Network CapabilityWord-p. 246
5.20a  Data Collection from an AF [R16]Word-p. 247
5.21  Architectural support for virtualized deploymentsWord-p. 247
5.22  System Enablers for priority mechanismWord-p. 255
5.23  Supporting for Asynchronous Type CommunicationWord-p. 257
5.24  3GPP PS Data OffWord-p. 258
5.25  Support of OAM FeaturesWord-p. 259
5.26  Configuration Transfer ProcedureWord-p. 260
5.27  Time Sensitive Communications [R16]Word-p. 261
5.28  Support of integration with TSN [R16]Word-p. 266
5.29  Support for 5G LAN-type service [R16]Word-p. 273
5.30  Support for non-public networks [R16]Word-p. 276
5.31  Support for Cellular IoT [R16]Word-p. 282
5.32  Support for ATSSS [R16]Word-p. 300
5.33  Support for Ultra Reliable Low Latency Communication [R16]Word-p. 313
5.34  Support of deployments topologies with specific SMF Service Areas [R16]Word-p. 320
5.35  Support for Integrated access and backhaul (IAB) [R16]Word-p. 327
5.36  RIM Information Transfer [R16]Word-p. 329
6  Network FunctionsWord-p. 329
7  Network Function Services and descriptionsWord-p. 365
8  Control and User Plane Protocol StacksWord-p. 379
A  Relationship between Service-Based Interfaces and Reference PointsWord-p. 389
B (Normative)  Mapping between temporary identitiesWord-p. 391
C  Guidelines and Principles for Compute-Storage SeparationWord-p. 392
D  5GS support for Non-Public Network deployment options [R16]Word-p. 393
E  Communication models for NF/NF services interaction [R16]Word-p. 396
F  Redundant user plane paths based on multiple UEs per device [R16]Word-p. 398
G  SCP Deployment Examples [R16]Word-p. 401
H (Normative)  TSN usage guidelines [R16]Word-p. 407
I (Normative)  TSN usage guidelines [R16]Word-p. 408
J  Link MTU considerations [R16]Word-p. 409
K  Change historyWord-p. 411

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