5G/NR - Network Architecture - SMF
NR CORE - SMF
SMF stands for Session Management Function. Simply put, it collects all the informations related to PDU session management from various network components (e.g, UPF, PCF, UDM) and controls / orchastrates those network components based on request from AMF.
Followings are the name of each network component.
AMF Access and Mobility Management Function ==> Equivalent to MME in 4G
AUSF Authentication Server Function
DN Data Network
NEF Network Exposure Function
NRF Network Repository Function
NSSF Network Slice Selection Function
PCF Policy Control Function ==> Equivalent to PCRF in 5G
(R)AN (Radio) Access Network
SMF Session Management Function
UDM Unified Data Management ==> Equivalent to HSS in 4G
UPF User Plane Function ==> Equivalent to PGW in 4G
SMSF SMS Function
SEAF SEcurity Anchor Function ==> part of AMF function
ARPF Authentication credential Repository and Processing Function
SIDF Subscription Identifier De-concealing Function
Based on 23.501-6.2.2, the functionality of AMF is descrbed as follows.
UE-Initiated PDU Sesstion Establishment Process
< 23.502 - Figure 220.127.116.11.1-1: UE-requested PDU Session Establishment for non-roaming and roaming with local breakout >