Content for  TS 23.288  Word version:  18.4.0

The Consumer NF/AF sends a request to the NWDAF for analytics related to relative proximity, using either the Nnwdaf_AnalyticsInfo or Nnwdaf_AnalyticsSubscription service. The Analytics ID is set to "Relative Proximity". The target for analytics reporting can be a single UE, group of UEs or any UE. Analytic filters may be provided as shown in clause 6.19.1. The Consumer NF/AF can request statistics or predictions or both for a given Analytics target period.

If the request is authorized and in order to provide the requested analytics, the NWDAF may subscribe to OAM services to retrieve relevant information to proximity analytics. The NWDAF may collect MDT input data per individual UE from OAM as defined in Table 6.19.2-1.

For relative proximity information, if the request is authorized and in order to provide the requested analytics, NWDAF may follow the UE Input Data Collection Procedure via the DCAF. DCAF may collect proximity related input data directly from the UE Application, for NWDAF to determine a list of UEs fulfilling certain proximity criterion. The NWDAF subscribes to the AF services as above invoking either Nnef_EventExposure_Subscribe for untrusted DCAF or Naf_EventExposure_Subscribe service for trusted DCAF with (Event ID = Relative Proximity, Event Filter information, Target of Event Reporting). The target of event reporting and / or Event Filter information is set according to the target of analytics reporting and / or analytics filters set during the step 1 of the procedure. Event filters can be defined for relative proximity to indicate to NWDAF on how to process the data from individual UEs to determine the set of UEs to be accounted for relative proximity. In the case of a trusted DCAF, the NWDAF may provide the Area of Interest, proximity range, predefined geographical area, or other criteria to the DCAF on the resolution of TAIs or any other finer resolution recognizable by the 5GC. In the case of an untrusted DCAF, NEF translates the requested criteria provided as event filter by the NWDAF into geographic zone identifier(s) or other geographic range identifier(s) or geographic direction identifier(s) that act as event filter(s) for the DCAF. The DCAF may collect the data from individual UEs based on Event Filters indicated by the NWDAF to determine the set of UEs to be accounted for relative proximity before notifying that directly (for trusted DCAF) or via NEF (for untrusted DCAF) to the NWDAF. Input data that may be collected from DCAF can be found in Table 6.19.2-2.

The NWDAF collects input data from AMF as defined in Table 6.19.2-3 via the AMF event exposure service as defined in TS 23.502.

The NWDAF collects input data from GMLC as defined in Table 6.19.2-3 using the Ngmlc_Location service as defined in TS 23.273 and TS 29.515.

The NWDAF collects input data from AF as defined in Table 6.19.2-3 via the AF event exposure service as defined in TS 23.502.

The NWDAF derives requested analytics.

The NWDAF provides requested relative proximity and TTC information as defined in Table 6.19.3-1 and Table 6.19.3-2 to the consumer NF or AF along with the corresponding Validity Period or any Validity Area, Validity Direction of interest or ranging distance, using either the Nnwdaf_AnalyticsInfo_Request response or Nnwdaf_AnalyticsSubscription_Subscribe response, depending on the service used in step 1.

If at step 1 the consumer NF or AF has subscribed to receive continuous reporting of relative proximity information, the NWDAF may generate new analytics and, when relevant according to the Analytics target period and Reporting Threshold, provide them along with the corresponding Validity Period (or any Validity Area, Validity Direction of interest or ranging distance) to the consumer NF or AF.