How it Works

This section describes how the SMF handles message-level failures and the corresponding HTTP status code-based failures.

The SMF initiates the following messages:

  • PcfSmpolicycontrolCreate

  • PcfSmpolicycontrolUpdate

  • PcfSmpolicycontrolDelete

During the PDU session lifecycle, the SMF exchanges the messages at various stages with the PCF. Depending on the HTTP status code configured in the NRF failure profile, the SMF takes one of the following actions:

  • Ignore

  • Continue

  • Terminate

Relationship between PCF Failover Messages and Actions

PcfSmpolicy controlCreate

PcfSmpolicy controlUpdate

PcfSmpolicy controlDelete

Ignore

Continue with locally configured/UDM-provided policy parameters.

Note

Do not contact PCF for subsequent messages.

PCF-Interaction Status: OFF

Continue with currently available snapshot of policy parameters.

Contact PCF for subsequent messages.

PCF-Interaction Status: ON

Ignore the current failure and delete the session.

PCF-Interaction Status: Session deleted

Continue

Continue with locally configured/UDM-provided policy parameters.

Note

Do not contact PCF for subsequent messages.

PCF-Interaction Status: OFF

Continue with currently available snapshot of policy parameters.

Note

Do not contact PCF for subsequent messages.

PCF-Interaction Status: OFF

Ignore the current failure and delete the session.

PCF-Interaction Status: Session deleted

Terminate

Terminate the session.

Terminate the session.

Terminate the session.