6.3.7.2 Providing policy requirements that apply to multiple UE and hence to multiple PCF

An authorized Application Function may, via the NEF, provide policy requirements that apply to multiple UE(s) (which, for example, belong to group of UE(s) defined by subscription or to any UE). Such policy requirements shall apply to any existing or future PDU Sessions that match the parameters in the AF request and they may apply to multiple PCF instance(s).

NOTE: Application Function influence on traffic routing described in clause 5.6.7 is an example of such requirement.

After relevant validation of the AF request (and possible parameter mapping), the NEF stores this request received from the AF into the selected UDR instance as the Data Subset of the Application data. The possible parameter mapping includes mapping UE (group) identifiers provided by the AF to identifiers used within the 5GC, e.g. from GPSI to SUPI and/or from External Group Identifier to Internal-Group Identifier. Parameter mapping may also include mapping from the identifier of the Application Function towards internal identifiers such as the DNN and/or the S-NSSAI.

PCF(s) that need to receive AF requests that targets a DNN (and slice) and/or a group of UEs subscribe to receive notifications from the UDR about such AF request information. The PCF(s) can be configured (e.g. by OAM) to subscribe to receive notification of such AF request information from the UDR(s). The PCF(s) take(s) the received AF request information into account when making policy decisions for existing and future relevant PDU Sessions. In the case of existing PDU Sessions, the policy decision of the PCF instance(s) may trigger a PCC rule(s) change from the PCF to the SMF.

The PCF subscription to notifications of AF requests described above may take place during PDU Session Establishment or PDU Session Modification, when the PCF(s) receive request(s) from the SMF for policy information related to the DNN (and slice) and/or the Internal-Group Identifier of UEs. For the PCF(s) that have subscribed to such notifications, the UDR(s) notify the PCF(s) of any AF request update.

The NEF associates the AF request with information allowing to later modify or delete the AF request in the UDR; it associates the AF request with:

• When the AF request targets PDU Sessions established by "any UE": the DNN, the slicing information target of the AF request,
• When the request targets PDU Sessions established by UE(s) belonging to an Internal-Group: the DNN, the slicing information and the Internal-Group Identifier target of the application request.
• The AF transaction identifier in the AF request.