Section: 4.15.6.7 Service specific parameter provisioning 4.15.6.7.1 General
Content: This clause describes the procedures for enabling the AF to provide service specific parameters to 5G system via NEF. The AF may issue requests on behalf of applications not owned by the PLMN serving the UE. NOTE 1: In the case of architecture without CAPIF support, the AF is locally configured with the API termination points for the service. In the case of architecture with CAPIF support, the AF obtains the service API information from the CAPIF core function via the Availability of service APIs event notification or Service Discover Response as specified in TS 23.222[ Common API Framework for 3GPP Northbound APIs ]  [54]. The AF request sent to the NEF contains the information as below: 1) Service Description. Service Description is the information to identify a service the Service Parameters are applied to. The Service Description in the AF request can be represented by the combination of DNN and S-NSSAI, an AF-Service-Identifier or an External Application Identifier. 2) Service Parameters. Service Parameters are the service specific information which needs to be provisioned in the Network and delivered to the UE in order to support the service identified by the Service Description. VPLMN ID(s) that indicates the PLMN(s) where the AF guidance on URSP determination and all its RSD(s), applies. 3) Target UE(s) or a group of UEs or PLMN ID(s) of inbound roamers. Target UE(s) or a group of UEs or PLMN ID(s) of inbound roamers indicate the UE(s) who the Service Parameters shall be delivered to. Individual UEs can be identified by GPSI, or an IP address/Prefix or a MAC address. Groups of UEs are identified by an External Group Identifiers as defined in TS 23.682[ Architecture enhancements to facilitate communications with packet data networks and applications ]  [23]. If identifiers of target UE(s) or a group of UEs or PLMN ID(s) of inbound roamers are not provided, then the Service Parameters shall be delivered to any UEs of the PLMN of the NEF using the service identified by the Service Description. 4) Subscription to events. The AF may subscribe to notifications about the outcome of the UE Policies delivery due to service specific parameter provisioning. The NEF authorizes the AF request received from the AF and stores the information in the UDR as "Application Data". The Service Parameters are delivered to the targeted UE by the PCF when the UE is reachable.