Challenge 5 : SMF

SMF stands for the Session Management Function. It is a core network element responsible for managing user sessions and connections within the 5G network. The SMF plays a crucial role in session establishment, modification, and termination, ensuring seamless data flow and service continuity for User Equipment (UE).

​SMF Responsibilities:

• ​SMF is responsible for selecting an appropriate UPF during the setup of a PDU session. Selection for appropriate UPF depends upon appropriate load, geographic location, PDU session type etc.
• SMF is responsible for selecting an appropriate Policy Control Function (PCF) during setup of a PDU session. It selects the PCF to provide the policy for a specific PDU session. The selection criteria depends upon the Data network name used by the PDU session, configured information etc.
• SMF requests subscription information from Unified Data Management (UDM) function during the setup of a PDU Session.
• Session Termination, when a session is completed or terminated, the SMF is responsible for releasing the allocated network resources and closing the data connection.

SMF: Configuration

To configure the SMF, you must provide the necessary information in the file located at “~/free5gc/config/smfcfg.yaml”

• registerIPv4: 127.0.0.2
• bindingIPv4: 127.0.0.2
• port: 8000
• mcc: 208
• mnc: 93
• nodeID, addr: 127.0.0.8 : the UPF IP address
• sNssai : ( sst = 1, sd = 010203 ) 
• cidr: 10.60.0.0/16 
• endpoints: <eth0 IP address>

Navigate to the AMF configuration file and modify the mentioned attributes with their respective values.

vim ~/free5gc/config/smfcfg.yaml