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Content for  TS 23.288  Word version:  17.6.0

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6.13  Redundant Transmission Experience related analytics |R17|p. 173

6.13.1  Generalp. 173

This clause describes the Redundant Transmission Experience related analytics. These analytics may be used by the SMF to determine whether redundant transmission on N3/N9 interfaces (see clause 5.33.2.2 of TS 23.501) shall be performed, or (if it had been activated) shall be stopped.
The service consumer may be a NF (e.g. SMF).
The consumer of these analytics may indicate in the request:
  • Analytics ID = "Redundant Transmission Experience".
  • Target of Analytics Reporting: a single UE (SUPI), any UE, or a group of UEs (an Internal Group ID).
  • Analytics Filter Information optionally containing:
    • Area of Interest;
    • S-NSSAI;
    • DNN;
    • optional list of analytics subsets that are requested (i.e. UL/DL packet drop rate GTP-U, UL/DL packet delay GTP-U, see clause 6.13.3).
  • An Analytics target period indicates the time period over which the statistics or predictions are requested.
  • Preferred level of accuracy of the analytics;
  • Preferred order of results for the list of Redundant Transmission Experience:
    • ordering criterion: "time slot start"; and
    • order: ascending or descending;
  • In a subscription, the Notification Correlation Id and the Notification Target Address are included.
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6.13.2  Input Datap. 174

The NWDAF supporting data analytics on Redundant Transmission Experience shall be able to collect UE mobility information from OAM, 5GC and AFs and service data from AF, as described in clause 6.7.2.2. In addition, NWDAF shall be able to collect the information for PDU session which is established with redundant transmission from the SMF. UE mobility information is specified in Table 6.7.2.2-1 and service data from AF related to UE mobility in Table 6.7.2.2-2. In addition, the NWDAF shall be able to collect performance measurements on user data congestion as specified in Table 6.8.2-1 for user data congestion analytics.
Additionally, the NWDAF collects the following input (see Table 6.13.2-1 and Table 6.13.2-2) according to existing measurements defined in clause 5.33.3 QoS Monitoring to Assist URLLC Service of TS 23.501.
Information Source Description
UL/DL packet drop rate GTP-UOAM (see NOTE 2)UL/DL packet drop rate measurement on GTP path on N3.
UL/DL packet delay GTPOAM (see NOTE 2)UL/DL packet delay measurement round trip on GTP path on N3.
NOTE 1:
The information in this Table is provided both as the base to compare with the redundant transmission performance as well as when redundant transmission is enabled.
NOTE 2:
Refer to clause 5.1 of TS 28.552 for the performance measurement in NG-RAN and clause 5.4.1 of TS 28.552 for the performance measurement in UPF. In addition, Annex A of TS 28.552 describes various performance measurements.
Information Source Description
DNNSMFData Network Name associated for URLLC service.
UP with redundant transmissionSMFRedundant transmission is setup or terminated.
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6.13.3  Output Analyticsp. 174

The NWDAF supporting data analytics on Redundant Transmission Experience shall be able to provide Redundant Transmission Experience analytics as defined in Table 6.13.3-1 and Table 6.13.3-2.
Information Description
UE group ID or UE ID, any UEIdentifies a UE, any UE, or a group of UEs.
DNNData Network Name associated for URLLC service.
Spatial validityArea where the Redundant Transmission Experience statistics applies.
If Area of Interest information was provided in the request or subscription, spatial validity should be the requested Area of Interest.
Time slot entry (1..max)List of time slots during the Analytics target period.
 > Time slot startTime slot start within the Analytics target period.
 > DurationDuration of the time slot (average and variance).
 > Observed Redundant Transmission ExperienceObserved Redundant Transmission Experience related information during the Analytics target period.
  >> UL/DL packet drop rate GTP-U (NOTE 2)Observed UL/DL packet drop rate on GTP-U path on N3 (average, variance).
  >> UL/DL packet delay GTP-U (NOTE 2)Observed UL/DL packet delay round trip on GTP-U path on N3 (average, variance).
 > Redundant Transmission StatusRedundant Transmission Status, i.e. redundant transmission was activated or not activated for the time slot entry.
 > RatioPercentage on which UE, any UE, or UE group experience the packet drop rate and packet delay.
NOTE 1:
The Observed Redundant Transmission Experience can be further derived by SMF from the observed UL/DL packet drop rate GTP-U and UL/DL packet delay GTP-U.
NOTE 2:
This information element is an analytics subset that can be used in "list of analytics subsets that are requested" and only applicable when Target of Analytics Reporting is for a single UE.
Information Description
UE group ID or UE ID, any UEIdentifies a UE or, any UE, a group of UEs.
DNNData Network Name associated for URLLC service.
Spatial validityArea where the estimated Redundant Transmission Experience predictions applies.
If Area of Interest information was provided in the request or subscription, spatial validity should be the requested Area of Interest.
Time slot entry (1..max)List of predicted time slots.
 >Time slot startTime slot start time within the Analytics target period.
 > DurationDuration of the time slot.
 > Predicted Redundant Transmission ExperiencePredicted Redundant Transmission Experience related information during the Analytics target period.
  >> UL/DL packet drop rate GTP-U (NOTE 2)Predicted UL/DL packet drop rate on GTP-U path on N3 (average, variance).
  >> UL/DL packet delay GTP-U (NOTE 2)Predicted UL/DL packet delay round trip on GTP-U path on N3 (average, variance).
 > Ratio Percentage on which the UE, any UE, or UE group may efficiently use the PDU session with redundant transmission.
 > ConfidenceConfidence of this prediction.
NOTE 1:
The Predicted Redundant Transmission Experience can be further derived by the SMF from the predicted UL/DL packet drop rate GTP-U and UL/DL packet delay GTP-U and based on which the SMF can decide to start redundant transmission or not.
NOTE 2:
This information element is an analytics subset that can be used in "list of analytics subsets that are requested" and only applicable when Target of Analytics Reporting is for a single UE.
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6.13.4  Proceduresp. 175

6.13.4.1  Analytics Procedurep. 175

Figure 6.13.4.1-1 shows the analytics procedure. The NWDAF can provide analytics, in the form of statistics or predictions or both.
Reproduction of 3GPP TS 23.288, Fig. 6.13.4.1-1: Redundant Transmission Experience analytics provided to an NF
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Step 1.
The analytics consumer sends a request to the NWDAF for analytics on a specific UE, any UE, or a group of UEs, using either the Nnwdaf_AnalyticsInfo or Nnwdaf_AnalyticsSubscription service. The NF can request statistics or predictions or both. The type of analytics is set to Redundant Transmission Experience. The NF provides the UE id or Internal Group ID in the Target of Analytics Reporting. Analytics Filter Information optionally contains DNN, S-NSSAI, Area of Interest, etc.
Step 2.
If the request is authorized and in order to provide the requested analytics, the NWDAF may subscribe to events with all the serving AMFs for notification of location changes and may subscribe to events with SMFs serving PDU Session on URLLC service for notification of redundant transmission related information.
The NWDAF may subscribe the service data from AF(s) by invoking Naf_EventExposure_Subscribe service or Nnef_EventExposure_Subscribe (if via NEF).
The NWDAF collects UE mobility information and/or packet measurement information from OAM, following the procedure captured in clause 6.2.3.2. The NWDAF collects redundant transmission status from SMF.
This step may be skipped when e.g. the NWDAF already has the requested analytics available.
Step 3.
The NWDAF derives requested analytics.
Step 4.
The NWDAF provide requested Redundant Transmission Experience analytics to the NF, using either the Nnwdaf_AnalyticsInfo_Request response or Nnwdaf_AnalyticsSubscription_Notify, depending on the service used in step 1.
Step 5-7.
If at step 1, the NF has subscribed to receive notifications for Redundant Transmission Experience analytics, after receiving event notification from the AMFs, SMF, AFs and OAM subscribed by NWDAF in step 2, the NWDAF may generate new analytics and provide them to the NF.
If a service consumer is SMF, the Redundant Transmission Experience analytics can be used to make decision if that redundant transmission shall be performed or (if activated) shall be stopped regarding the PDU session for URLLC service.
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