AF subscribes to the Member UE selection assistance functionality by sending Nnef_MemberUESelectionAssistance_subscribe request including the Application Identity, AoI, DNN/S-NSSAI, DNAI(s), Service Experience Type and contribution weights associated to location, time window, Application ID and Service Experience type.
NEF verifies the authorization of the AF Request and identifies which information needs to be collected and executed based on the Service Experience filtering criteria provided by the AF.
If S-NSSAI/DNN and DNAI(s) are not included in the request from the AF, the NEF derives the S-NSSAI, DNN and DNAI(s) which this Application has access to. NEF discovers and selects the NWDAF(s) by invoking Nudm_UECM_Get or Nnrf_NFDiscovery_Request including Analytics ID = Service Experience, AoI, S-NSSAI, etc.
NEF sends an Analytics request/subscribe to NWDAF by invoking a Nnwdaf_AnalyticsInfo_Request or a Nnwdaf_AnalyticsSubscription_Subscribe, including Analytics ID = Service Experience, Application ID, S-NSSAI, DNN, AoI, DNAI(s), and target UEs based on the initial list obtained from the AF.
The NWDAF provides the data analytics, i.e. the observed Service Experience (which can be a range of values) to the consumer NF by means of either Nnwdaf_AnalyticsInfo_Request response or Nnwdaf_AnalyticsSubscription_Notify, depending on the service used in step 4.
Based on the Analytics report received from the NWDAF, NEF consolidates results and derives the list(s) of candidate UE(s). For applying that, NEF may use the Service Experience type provided by the AF consumer in the filtering information and use operator policies to interpret a customized MoS. Additionally, NEF may use the contribution weight associated to an application and a Service Experience Type (e.g. AI/ML traffic) and apply them to a location and time window, as provided by the AF consumer, to be used as reporting thresholds when selecting candidate Member UEs, e.g. the NEF may select a UE with a specific Service Experience Type as a Member UE candidate, if the associated Service Experience fulfils the threshold for Service Experience filtering criteria provided by the AF.
NEF sends a Nnef_MemberUESelectionAssistance_Notify request to the AF including the list(s) of candidate UE(s) and additional information.