QCI Modification for Dynamic Rules

In certain scenarios, existing sessions can be upgraded from non-WPS to WPS or downgraded from WPS to non-WPS. In such cases, the PCF sends an N7 notification to the SMF along with a new QCI/ARP (QoS Class Identifier/Allocation and Retention Priority).

If the new QCI is configured to be NAS-remapped, the SMF includes the remapped QCI in the parameter list of QoS Flow Descriptions within the N1 modification command message sent to the UE (User Equipment) if it is connected to a 5G RAT (Radio Access Technology).

For UEs connected to 4G or Wi-Fi RATs, the remapped QCI is sent within the QoS Flow Description as part of the protocol configuration option in the Update Bearer request.

During Wi-Fi Handover, if the PCF sends a nonstandard QCI for which the SMF has a remapping configuration, the remapped QCI specified in the configuration is sent to the UE in the N1 PDU (Protocol Data Unit) establishment response, the Create Session response, or the Create Bearer Request.

SMF remaps configuration and any run time configuration change is applied only during the following procedures:

  • New default bearer session creation

  • New QoS flow or bearer creation request from PCF

  • QCI upgrade or downgrade from PCF

  • Wi-Fi handover

For more information, see the Remapping Nonstandard QCI to Standard QCI.