5G • Core Network
Nsmf Interface
SMF Service-Based Interface
RESTful service interface exposed by SMF for PDU session creation, modification, and charging control.
Technical Explanation
Exposed over HTTP/2, Nsmf includes Nsmf_PDUSession (handling PDU session creation, update, and release requests from AMF) and Nsmf_EventExposure (reporting user plane usage and session state changes to PCF and NWDAF).
Key Functions
- Provides PDU session lifecycle management APIs to AMF
- Facilitates policy and charging rule synchronization with PCF
- Exposes session events and traffic metrics to NWDAF analytics
Specifications
3GPP TS 29.502
Interfaces
NsmfSBI
Related 5G Concepts
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