5G Reference Network Architecture - as per 3GPP TR 23.799
1. Network nodes and their functions:
- User Equipment (UE)
- Next Gen Node Basestation (gNB)
2. Core Access and Mobility Management Function (AMF) – responsible for following:
- Termination of RAN Control Plane interface (NG2)
- Termination of NAS (NG1), NAS ciphering and integrity protection
- Mobility Management
- Lawful intercept (for AMF events and interface to Lawful Inetercept System)
- Transparent proxy for routing access authentication and SM messages
- Access Authentication
- Access Authorization
- Security Anchor Function (SEA): It interacts with the UDM and the UE, receives the intermediate key that was established as a result of the UE authentication process; in case of USIM based authentication, the AMF retrieves the security material from the UDM
- Security Context Management (SCM): it receives a key from the SEA that it uses to derive access-network specific keys
3. User plane Function (UPF) – functions are:
- QoS handling for User plane
- Packet routing & forwarding
- Packet inspection and Policy rule enforcement
- Lawful intercept (User Plane)
- Traffic accounting and reporting
- Anchor point for Intra-/Inter-RAT mobility (when applicable)
- Support for interaction with external DN for transport of signaling for PDU session authorization/authentication by external DN
4. Session Management Control Function (SMF) – supports following:
- Session Management
- UE IP address allocation & management (including optional Authorization)
- Selection and control of User Plane function
- Termination of interfaces towards Policy control and Charging functions
- Control part of policy enforcement and QoS
- Lawful intercept (for Session Management events and interface to Lawful Intercept System)
- Termination of Session Management parts of NAS messages
- Downlink Data Notification
- Initiator of Access Node specific Session Management information, sent via AMF over NG2 to Access Node
- Roaming functionality
- Handle local enforcement to apply QoS SLAs (VPLMN)
- Charging data collection and charging interface (VPLMN)
- Lawful intercept (in VPLMN for Session Management events and interface to Lawful Intercept System)
- Data Network (DN): Operator services, Internet access or other services
5. Authentication Server Function (AUSF)
- Performs authentication processes with the UE
- Unified Data Management (UDM) – Supports:
- Authentication Credential Repository and Processing Function (ARPF); this function stores the long-term security credentials used in authentication for AKA
- Storing of Subscription information
6. Policy Control Function (PCF) Provides:
- Support of unified policy framework to govern network behavior
- Policy rules to control plane function(s) that enforce them
7. Application Function (AF)
- Requests dynamic policies and/or charging control
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