4.6.2 Handling of measurement collection at handover in NR
28.4053GPPControl and configurationQuality of Experience (QoE) measurement collectionRelease 18Telecommunication managementTS
4.6.2.1 NG Based Handover for Signalling Based Activation
The figure 4.6.2.1-1 and the text below describe the handling at NG Based handover between gNBs for Signalling Based Activation case.
Figure 4.6.2.1-1: Handling of QMC activation example in case of NG Based handover in NR for Signalling Based Activation
1. Source gNB sends the message HANDOVER REQUIRED to AMF. The message includes the Source to Target Transparent Container which contains qoEReference, serviceType, measConfigAppLayerID, measCollEntityIPAddress, qoEMeasurementStatus, sliceSupportListQMC, nGRANTraceId, availableRANVisibleqoEMetrics and containerForAppLayerMeasConfig.
2. AMF sends the message HANDOVER REQUEST to the Target gNB. The message includes the Source to Target Transparent Container which contains the same parameters as in step 1.
3. The target gNB checks if the measurements will be continued or not.
4. The target gNB sends the message HANDOVER REQUEST ACKNOWLEDGE to the AMF.
5. The AMF sends the message HANDOVER COMMAND to the source gNB.
6. The source gNB sends the message RRCReconfiguration to the UE.
7. The UE sends the message RRCReconfigurationComplete to the gNB.
8. When the ongoing QMC is completed or end of periodic reporting is reached, the recorded information is collected in a QMC report, see [6], [7] or [13], at UE Application Level.
9. The application layer sends the AT command +CAPPLEVMRNR including meas_config_app_layer_id, qoe_measurement_status playout_delay_for_media_startup, number_of_buffer_level_entries, report_initial_playout_delay, and the app-meas_report to the access stratum.
10. The UE sends the message MeasurementReportAppLayer including measConfigAppLayerId, appLayerSessionStatus and measReportAppLayerContainer to the gNB.
11. The gNB sends the QMC report to the MCE associated to the qoEReference. The report contains the qoEReference and the RAN transparent container including the recordingSessionId and sliceScope (which contains only S-NSSAI that is used). Note that the qoEReference is mapped to the measConfigAppLayerId at gNB on the previous step and is included in QMC report.