5G Core NF APIs Across 3GPP Releases 15–18

Author: Khushi Chhillar

Published: April 8, 2025

Note: All service definitions link to jdegre/5GC_APIs, a community-maintained mirror of the 3GPP-defined OpenAPI YAML specifications for the 5G Core Service-Based Interfaces (SBIs).

The tables below track how the Service-Based Interfaces (SBIs) exposed by each 5G Core network function (NF) have grown across 3GPP Releases 15 through 18. Services highlighted in a release column were newly introduced in that release relative to the previous one. Each NF has its own table so the release-over-release additions stay easy to scan.

Note: These tables are wide. For a better view, zoom out your browser to about 50% (Ctrl + -) before reading them.

AMF

REL 15	REL 16	REL 17	REL 18
• Communication • Event Exposure • Location • MT	• Communication • Event Exposure • Location • MT	• Communication • Event Exposure • Location • MT • MBS Communication • MBS Broadcast	• Communication • Event Exposure • Location • MT • MBS Communication • MBS Broadcast

SMF

REL 15	REL 16	REL 17	REL 18
• PDU Session • Event Exposure	• PDU Session • Event Exposure • NIDD (Non-IP Data Delivery)	• PDU Session • Event Exposure • NIDD (Non-IP Data Delivery)	• PDU Session • Event Exposure • NIDD (Non-IP Data Delivery)

PCF

REL 15	REL 16	REL 17	REL 18
• Policy Authorization • Access and Mobility (AM) Policy Control • Session Management (SM) Policy Control • Background Data Transfer (BDT) Policy Control • Policy Control Event Exposure • UE Policy Control	• Policy Authorization • Access and Mobility (AM) Policy Control • Session Management (SM) Policy Control • Background Data Transfer (BDT) Policy Control • Policy Control Event Exposure • UE Policy Control	• Policy Authorization • Access and Mobility (AM) Policy Authorization • Access and Mobility (AM) Policy Control • Session Management (SM) Policy Control • Background Data Transfer (BDT) Policy Control • Policy Control Event Exposure • UE Policy Control • Multicast/Broadcast Policy Control • Multicast/Broadcast Policy Authorization	• Policy Authorization • Access and Mobility (AM) Policy Authorization • Access and Mobility (AM) Policy Control • Session Management (SM) Policy Control • Background Data Transfer (BDT) Policy Control • Policy Control Event Exposure • UE Policy Control • Multicast/Broadcast Policy Control • Multicast/Broadcast Policy Authorization • Planned Data Transfer with QoS (PDTQ) Policy Control

UDM

REL 15	REL 16	REL 17	REL 18
• Subscriber Data Management • UE Context Management • UE Authentication • Event Exposure • Parameter Provisioning	• Subscriber Data Management • UE Context Management • UE Authentication • Event Exposure • Parameter Provisioning • NIDD Authorization • MT	• Subscriber Data Management • UE Context Management • UE Authentication • Event Exposure • Parameter Provisioning • NIDD Authorization • MT • Service-Specific Authorization • RSDS (Report SM Delivery Status) • UEID (UE Identifier)	• Subscriber Data Management • UE Context Management • UE Authentication • Event Exposure • Parameter Provisioning • NIDD Authorization • MT • Service-Specific Authorization • RSDS (Report SM Delivery Status) • UEID (UE Identifier)

UDR

REL 15	REL 16	REL 17	REL 18
• Data Repository • Subscription Data • Policy Data • Exposure Data • Application Data	• Data Repository • Subscription Data • Policy Data • Exposure Data • Application Data • Group ID Map	• Data Repository • Subscription Data • Policy Data • Exposure Data • Application Data • Group ID Map	• Data Repository • Subscription Data • Policy Data • Exposure Data • Application Data • Group ID Map

AUSF

REL 15	REL 16	REL 17	REL 18
• UE Authentication • SoR (Steering of Roaming) Protection • UPU (UE Parameter Update) Protection	• UE Authentication • SoR (Steering of Roaming) Protection • UPU (UE Parameter Update) Protection	• UE Authentication • SoR (Steering of Roaming) Protection • UPU (UE Parameter Update) Protection	• UE Authentication • SoR (Steering of Roaming) Protection • UPU (UE Parameter Update) Protection

NSSF

REL 15	REL 16	REL 17	REL 18
• NSSAI Availability • NS Selection	• NSSAI Availability • NS Selection	• NSSAI Availability • NS Selection	• NSSAI Availability • NS Selection

NRF

REL 15	REL 16	REL 17	REL 18
• NF Management • NF Discovery • Access Token (OAuth2)	• NF Management • NF Discovery • Access Token (OAuth2) • Bootstrapping	• NF Management • NF Discovery • Access Token (OAuth2) • Bootstrapping	• NF Management • NF Discovery • Access Token (OAuth2) • Bootstrapping