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Content for  TS 29.518  Word version:  17.4.0

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1  ScopeWord‑p. 15

The present document specifies the stage 3 protocol and data model for the Namf Service Based Interface. It provides stage 3 protocol definitions and message flows, and specifies the API for each service offered by the AMF.
The 5G System stage 2 architecture and procedures are specified in TS 23.501 and TS 23.502.
The Technical Realization of the Service Based Architecture and the Principles and Guidelines for Services Definition are specified in TS 29.500 and TS 29.501.
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2  ReferencesWord‑p. 15

[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 23.501: "System Architecture for the 5G System; Stage 2".
[3]
TS 23.502: "Procedures for the 5G System; Stage 2".
[4]
TS 29.500: "5G System; Technical Realization of Service Based Architecture; Stage 3".
[5]
TS 29.501: "5G System; Principles and Guidelines for Services Definition; Stage 3".
[6]
TS 29.571: "5G System; Common Data Types for Service Based Interfaces Stage 3".
[7]
TS 23.503: "Policy and Charging Control Framework for the 5G System; Stage 2".
[8]
RFC 8259:  "The JavaScript Object Notation (JSON) Data Interchange Format".
[9]
RFC 2387:  "The MIME Multipart/Related Content-type".
[10]
RFC 2045:  "Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies".
[11]
TS 24.501: "Non-Access-Stratum (NAS) Protocol for 5G System (5GS); Stage 3".
[12]
TS 38.413: "NG Radio Access Network (NG-RAN); NG Application Protocol (NGAP)".
[13]
TS 36.355: "Evolved Universal Terrestrial Radio Access (E-UTRA); LTE Positioning Protocol (LPP)".
[14]
RFC 6902:  "JavaScript Object Notation (JSON) Patch".
[15]
TS 24.007: "Mobile radio interface signalling layer 3; General Aspects".
[16]
TS 29.502: "5G System, Session Management Services; Stage 3".
[17]
TS 38.455: "NR Positioning Protocol A (NRPPa)".
[18]
TS 29.531: "Network Slice Selection Services; Stage 3".
[19]
RFC 7540:  "Hypertext Transfer Protocol Version 2 (HTTP/2)".
[20]
TS 23.041: "Technical realization of Cell Broadcast Service (CBS)".
[21]  Void.
[22]
TS 24.008: "Mobile radio interface Layer 3 specification; Core network protocols; Stage 3".
[23]
OpenAPI Initiative, "OpenAPI 3.0.0 Specification", https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.0.md.
[24]
TS 36.413: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP)".
[25]
TS 29.572: "5G System, Location Management Services; Stage 3".
[26]  Void.
[27]
TS 33.501: "Security architecture and procedures for 5G system".
[28]
RFC 6749:  "The OAuth 2.0 Authorization Framework".
[29]
TS 29.510: "Network Function Repository Services; Stage 3".
[30]
TS 32.422: "Telecommunication management; Subscriber and equipment trace; Trace control and configuration management".
[31]  Void.
[32]
TS 29.507: "5G System; Access and Mobility Policy Control Service; Stage 3".
[33]
TS 23.527: "5G System; Restoration Procedures".
[34]
TS 29.525: "5G System; UE Policy Control Service; Stage 3".
[35]
TS 29.503: "5G System; Unified Data Management Services; Stage 3".
[36]
RFC 7807:  "Problem Details for HTTP APIs".
[37]
TR 21.900: "Technical Specification Group working methods".
[38]
TS 23.288: "Architecture enhancements for 5G System (5GS) to support network data analytics services".
[39]
TS 23.216: "Single Radio Voice Call Continuity (SRVCC); Stage 2".
[40]
RFC 6901:  "JavaScript Object Notation (JSON) Pointer".
[41]
TS 29.274: "3GPP Evolved Packet System (EPS); Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C); Stage 3".
[42]
TS 23.273: "5G System (5GS) Location Services (LCS); Stage 2".
[43]
TS 24.080: "Mobile radio interface layer 3 supplementary services specification; Formats and coding".
[44]
TS 23.040: "Technical realization of the Short Message Service (SMS)".
[45]
TS 24.011: "Point-to-Point (PP) Short Message Service (SMS) support on mobile radio interface".
[46]
TS 29.515: "5G System; Gateway Mobile Location Services Stage 3".
[47]
TS 23.287: "Architecture enhancements for 5G System (5GS) to support Vehicle-to-Everything (V2X) services".
[48]
TS 23.316: "Wireless and wireline convergence access support for the 5G System (5GS)".
[49]
TS 33.401: "3GPP System Architecture Evolution (SAE); Security architecture".
[50]
TS 29.010: "Information element mapping between Mobile Station - Base Station System (MS - BSS) and Base Station System - Mobile-services Switching Centre (BSS - MSC); Signalling Procedures and the Mobile Application Part (MAP)".
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3  Definitions and abbreviationsWord‑p. 17

3.1  DefinitionsWord‑p. 17

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.2  AbbreviationsWord‑p. 17

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
5GC
5G Core Network
5GS
5G System
5G-AN
5G Access Network
5G-GUTI
5G Globally Unique Temporary Identifier
5QI
5G QoS Identifier
AMF
Access and Mobility Management Function
DAPS
Dual Active Protocol Stacks
EBI
EPS Bearer Identity
GAD
Universal Geographical Area Description
GPSI
Generic Public Subscription Identifier
GUAMI
Globally Unique AMF Identifier
JSON
JavaScript Object Notation
LADN
Local Area Data Network
LDR
Location Deferred Request
LMF
Location Management Function
MA
Multi-Access
MM
Mobility Management
N3IWF
Non-3GPP InterWorking Function
NEF
Network Exposure Function
NR
New Radio
NRF
Network Repository Function
NRPPa
NR Positioning Protocol A
NSI ID
Network Slice Instance Identifier
NSSAI
Network Slice Selection Assistance Information
NSSAA
Network Slice-Specific Authentication and Authorization
NWDAF
Network Data Analytics Function
PCF
Policy Control Function
PEI
Permanent Equipment Identifier
RAT
Radio Access Type
RFSP
RAT/Frequency Selection Priority
SARI
Service Area Restriction Information
SBI
Service Based Interface
SM
Session Management
SMF
Session Management Function
SMSF
Short Message Service Function
S-NSSAI
Single Network Slice Selection Assistance Information
SUCI
Subscription Concealed Identifier
SUPI
Subscription Permanent Identifier
TA
Tracking Area
TAI
Tracking Area Identity
TNAP
Trusted Non-3GPP Access Point
TWAP
Trusted WLAN Access Point
UDM
Unified Data Management
UDSF
Unstructured Data Storage Function
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4  OverviewWord‑p. 18

4.1  IntroductionWord‑p. 18

Within the 5GC, the AMF offers services to the SMF, other AMF, PCF, SMSF, LMF, GMLC, CBCF, PWS-IWF , NWDAF and NEF via the Namf service based interface (see TS 23.501, TS 23.502 and TS 23.288).
Figure 4.1-1 provides the reference model (in service based interface representation and in reference point representation), with focus on the AMF and the scope of the present specification.
Copy of original 3GPP image for 3GPP TS 29.518, Fig. 4.1-1: Reference model - AMF
Figure 4.1-1: Reference model - AMF
(⇒ copy of original 3GPP image)
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The functionalities supported by the AMF are listed in clause 6.2.1 of TS 23.501.

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