It is a control plane function in the 5G core network. AMF supports termination of NAS signalling, NAS ciphering & integrity protection, registration management, connection management, mobility management, access authentication and authorization, security context management.
AMF takes configuration from Configuration Service. Configuration is handled at Network Slice level. Configuration (Network Slices) can be added, removed and deleted. AMF has prometheus interface to export metrics. Metrics include connected gNodeB's and its status.
- Termination of RAN CP interface (N2)
- Termination of NAS (N1), NAS ciphering and integrity protection
- Registration management
- Connection management
- Reachability management
- Mobility Management
- Provide transport for SM messages between UE and SMF
- Transparent proxy for routing SM messages
- Access Authentication
- Access Authorization
- Registration/Deregistration
- Registration update
- UE initiated Service request
- N2 Handover
- Xn handover
- PDU Establishment Request/Release
- Paging
- CN High Availibilty and Stateless session support
- AMF metrics are available via metricfunc on the 5g Grafana dashboard
Compliance of the 5G Network functions can be found at 5G Compliance
- #sdcore-dev channel in ONF Community Slack
- Raise Github issues