Feature Description

The PCF instructs the SMF to trigger PCF interaction to request PCC rule from the PCF if not provided yet. The PCF performs this operation by providing revalidation time within the "revalidationTime" attribute and the RE_TIMEOUT policy control request trigger within the "policyCtrlReqTriggers" attribute in SmPolicyDecision. The PCF can change the revalidation time by including a new value for the "revalidationTime" attribute. The PCF can also disable the revalidation function by removing RE_TIMEOUT policy control request trigger if it has been provided.

If the SMF receives the existing revalidation time or the new revalidation time, the SMF stores the received value and starts the timer based on it. Then, the SMF sends the PCC rule request before the indicated revalidation time. If the RE_TIMEOUT policy control request trigger is removed, the SMF stops the timer for revalidation.

Note

When the RE_TIMEOUT is removed, the revalidation time value previously provided to the SMF is no longer applicable.