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Update 01-quickstart.md

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Ali Shirvani 2023-02-21 08:05:37 +03:30 committed by Sukchan Lee
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@ -56,7 +56,7 @@ The Open5GS 5G SA Core contains the following functions:
* 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** (SBI). **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. Finally there is the SCP that enable indirect communication.
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. 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.