Content for  TS 23.288  Word version:  19.1.0

Clause 6.18 describes how NWDAF can provide E2E data volume transfer time analytics, in the form of statistics or predictions or both, to a service consumer. NWDAF collects E2E data volume transfer time related input data from 5GC NFs, OAM and AF. The consumer can either subscribe to analytics notifications (i.e. a Subscribe-Notify model) or request a single notification (i.e. a Request-Response model). The E2E data volume transfer time refers to a time delay for completing the transmission of a specific data volume from UE to AF, or from AF to UE. The data volume may be the expected or observed data volume from UE to AF or from AF to UE. The NWDAF may use the data volume indicated by the consumer as a reference to collect the input data for deriving the statistics and predictions of the end-to-end data volume transfer time. If a target repetition number of data transmissions or a target time interval between data transmissions is given, the E2E data volume transfer time can be provided as an average value of the data volume transfer times within the Analytics target period. The E2E data volume transfer time analytics may be used to assist an AF or NEF with AI/ML-based services, e.g. for member UE selection of federated learning. The E2E data volume transfer time analytics may be provided as defined in clause 6.18.3 for a single UE or a list of UEs. More than one E2E data volume transfer time classes might be assigned by operator or AF to a list of UEs. The UEs might be classified into high-, medium- and low-transfer time classes with respect to the threshold(s) of the corresponding class. The service consumer may be an NF (e.g. AF, or NEF). The consumer of these analytics indicates in the request or subscription:

• Analytics ID = "E2E data volume transfer time".
• Target of Analytics Reporting as defined in clause 6.1.3.
• Analytics Filter Information, including:
  • Optionally, DNN;
  • Optionally, S-NSSAI;
  • Optionally, Application ID;
  • Optionally, Area of Interest (AOI(s)): restricts the scope of the E2E data volume transfer time analytics to the provided area;
  • Optionally, a list of analytics subsets that are requested (see clause 6.18.3);
  • QoS requirements (e.g. 5QI, QoS Characteristics);
  • Optionally, either a target number of repeating data transmissions or a target time interval between data transmissions within the Analytics target period;
• Data Volume UL/DL: indicates a specific data volume per transmission either from UE to AF or from AF to UE;
• A request for geographical distribution (i.e. the AoIs) of the UEs.

An Analytics target period indicates the time period over which the statistics or predictions are requested.

• In a subscription, the Notification Correlation Id and the Notification Target Address are included.
• Optionally, preferred level of accuracy of the analytics.
• Optionally, preferred level of accuracy per analytics subset (see clause 6.18.3).
• Optionally, preferred order of results for the list of E2E data volume transfer times:
  • ordering criterion: "E2E data volume transfer time",
  • order: ascending or descending.
• Optionally, Reporting Thresholds, which apply only for subscriptions and indicate conditions on the levels to be reached for the respective analytics subsets (see clause 6.18.3)
• Optionally, maximum number of UEs.

The NWDAF supporting analytics on E2E data volume transfer time shall be able to collect information from AF, OAM and 5GC NFs. The information collected by the NWDAF from the OAM is defined in the Table 6.18.2-1, from relevant 5GC NFs (i.e. UPF, SMF, AMF) is defined in Table 6.18.2-2 and from AF is defined in Table 6.18.2-3.

NWDAF subscribes to the input data from OAM as defined in the Table 6.18.2-1 by using the services provided by OAM as described in clause 6.2.3.

For calculation of the E2E data volume transfer time, the NWDAF uses mainly the Data Volume DL/UL provided by the analytics consumer (see clause 6.18.1) and the Average DL/UL UE throughput in gNB of the NG-RAN serving the UE or in the AoI (if an AoI is provided by the analytics consumer). Per UE input parameters if available may also be taken into account by the NWDAF.

The NWDAF supporting E2E data volume transfer time analytics provides the analytics results to consumer NFs, e.g. AF, or NEF. The analytics results provided by the NWDAF could be E2E data volume transfer time statistics as defined in Table 6.18.3-1 or predictions as defined in Table 6.18.3-2.

The NWDAF may provide E2E data volume transfer time analytics to a 5GC NF (e.g. AF, or NEF).