Content for  TS 23.288  Word version:  18.4.0

This clause specifies the procedure for an NWDAF to provide statistics on whether traffic of UEs via one or multiple PDU sessions is according to the information provide by the service consumer. The NWDAF collects traffic flow information of UE traffic via PDU session(s) established for a specific S-NSSAI and/or DNN and provides statistics of UEs that route traffic according to the information provided by the service consumer (e.g., Traffic Descriptor, S-NSSAI, DNN) and UEs that route traffic which is not expected according to the information provided by the service consumer (e.g., Traffic Descriptor, S-NSSAI, DNN). The assumption is that Traffic Descriptors are known (e.g. known flow description), so that there are associated Packet Detection Rule(s) for the known traffic configured in the UPF. The service consumer may be a PCF. The consumer of these analytics includes in the request:

• Analytics ID = "PDU Session traffic".
• Target of Analytics Reporting: a SUPI or a list of SUPIs or an Internal-Group-Id or any UE.
• Traffic Descriptor: Application Identifier, IP Descriptions or Domain Descriptors are applicable.
• Analytics Filter Information containing:
  • Area of Interest (i.e. the location of UEs where PDU Session traffic is monitored);
  • S-NSSAI;
  • DNN;
  • an optional list of analytics subsets that are requested (see clause 6.20.3);
• Optionally, preferred level of accuracy of the analytics.
• Optionally, preferred level of accuracy per analytics subset (see clause 6.20.3);
• An Analytics target period indicates the time period over which the analytics are requested.
• Optionally, maximum number of objects.
• In a subscription, the Notification Correlation Id and the Notification Target Address are included.

NWDAF collects input data from the SMF and/or UPF. The detailed data are described in Table 6.20.2-1.

The NWDAF collects input data from the UPF either indirectly via the SMF, or directly from the UPF using the "UserDataUsageMeasures" event exposure event as described in clause 4.15.4.5 of TS 23.502. Further details about input parameters are described in Table 4.15.4.5.1-1 of TS 23.502.

The NWDAF collects input data from the UPF, via SMF when the request is for a UE or a group of UEs or directly from the UPF when possible (see clause 5.8.2.17 of TS 23.501) if the request applies for any UE and NWDAF provides analytics of UEs about the traffic they route over a PDU session of specific S-NSSAI/DNN according to the Traffic Descriptor provided by the consumer and traffic they route over a PDU Session that is not according to the Traffic Descriptor provided by the consumer and information about that traffic. The output analytics is shown in Table 6.20.3-1.

The procedure for deriving PDU Session traffic is shown below.