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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