How it Works

The Gating Control feature works in the following manner:

  1. PCF sends flowStatus attribute in TrafficControlData referenced by the PCC rule. The value of this attribute is set to "enabled", "disabled", "enable_uplink", or "enable_downlink" based on the PCF decision.

  2. On receiving this attribute, the SMF instructs the UPF to open or close the GATE for the UL or DL Packet Detection Rule (PDR), or both UL and DL PDRs for the associated PCC rule. The Gate Status Information Element (IE) in Create QoS Enhancement Rule (QER) or Update QER associated with the PDR is set to OPEN or CLOSED.

  3. If there is any subsequent change, the PCF triggers a N4 modification request to change the GATE status.