SRS‐RAN
Start by installing SRS-RAN Install guide
The following is based on a SRS-RAN Toturial
The Open5GS 5G SA Core contains the following functions:
NRF - NF Repository Function
SCP - Service Communication Proxy
SEPP - Security Edge Protection Proxy
AMF - Access and Mobility Management Function
SMF - Session Management Function
UPF - User Plane Function
AUSF - Authentication Server Function
UDM - Unified Data Management
UDR - Unified Data Repository
PCF - Policy and Charging Function
NSSF - Network Slice Selection Function
BSF - Binding Support Function
The 5G SA core works in a different way to the 4G core - it uses a Service Based Architecture (SBA). Control plane functions are configured to register with the NRF, and the NRF then helps them discover the other core functions. Running through the other functions: The AMF handles connection and mobility management; a subset of what the 4G MME is tasked with. gNBs (5G basestations) connect to the AMF. The UDM, AUSF and UDR carry out similar operations as the 4G HSS, generating SIM authentication vectors and holding the subscriber profile. Session management is all handled by the SMF (previously the responsibility of the 4G MME/ SGWC/ PGWC). The NSSF provides a way to select the network slice, and PCF is used for charging and enforcing subscriber policies, and SEPP is part of the roaming security architecture. Finally there is the SCP that enable indirect communication.
The 5G SA core user plane is much simpler, as it only contains a single function. The UPF carries user data packets between the gNB and the external WAN. It connects back to the SMF too.
With the exception of the SMF and UPF, all config files for the 5G SA core functions only contain the function’s IP bind addresses/ local Interface names and the IP address/ DNS name of the NRF.