How it Works

PCF must send the rulebase name to enable the static PCC rule support on SMF.

When the PCF provides the rulebase name, the SMF performs the following steps during the PDU session creation:

  1. The SMF sends Npcf_SMPolicycontrolCreate message to PCF. In response to this message, the PCF may send SMPolicyDecision with a PccRule. If the rule ID of the PccRule is in cbn# rulebase name format, the SMF assumes that the rule id is representing a rulebase name.

  2. The SMF sends the rulebase name to the UPF in PFCP Session Establishment Request in a proprietary IE within Create PDR IE.

Note

The SMF sends this name only in the default PDR which does not have any SDF filters. No other PDR, FAR, QER, and URR are sent to the UPF for the static rules. The UPF can derive the same from the rulebase name.