Metadata Provided by SMF for EDR

The SMF provides the following metadata to the User Plane Function (UPF), which includes the data in the generated EDRs:

  • Called-Station-ID: Specifies the DNN for the session

  • Calling-Station-ID: Specifies the MSISDN of the UE

  • RAT Type: RAT type for the current session (NR or EUTRAN)

  • ULI: User location for the current session

The UPF receives the above data in the "Subscriber Parameters" IE in the PFCP Session Establishment Request message. The RAT type and ULI can change during the lifetime of session (for events, such as 5G to 4G handover). The UPF receives the changed values of these parameters in the PFCP Session Modification Request message.

Note
  • All the parameters are always sent from the SMF to the UPF irrespective of EDR configuration being available. These parameters ensure that any change in configuration after the session creation is immediately applied on the UPF.

  • The SMF supports EDR-related configurations. However, the SMF does not require these configurations for its functionality. These configurations are sent to the UPF through RCM.