4.2 Management based activation in LTE
28.4053GPPControl and configurationQuality of Experience (QoE) measurement collectionRelease 18Telecommunication managementTS
4.2.1 Activation of measurement collection job and reporting of collected information in LTE
The parameters for the network request session are sent from the management system to the eNBs that host the cells that are included in the collection job request in the activateAreaQMCJob operation [3]. The eNB starts a network request session, with the Network request session id [3] given in activateAreaQMCJob operation [3]. For the duration of the network request session, the eNB(s) checks for connections where the UE has the QoE-MeasReport capability [8] for collection of streaming services or the QoE-MTSI-MeasReport capability [8] for collection of MTSI services. The UE capability is sent from the UE to eNB via the core network in message UE CAPABILITY INFO INDICATION [9].
When a session is found that has a UE with the wanted UE capability, the eNB starts a UE request session and sends a RRCConnectionReconfiguration [8] to the UE.
The AT command +CAPPLEVMC [5] activates provisioning of measurement reporting from the lower layers to the application within the UE by an unsolicited result code +CAPPLEVMC. When information about a measurement report is received in the UE from the network, the unsolicited result code +CAPPLEVMC contains the relevant parameters (service_type, start_stop-indication and config-file & config-file length if applicable) that are provided from the lower layers in the UE to the application.
Figure 4.2.1-1: QMC activation and reporting in LTE
1. The NM sends activateAreaQMCJob to DM/EM that controls the impacted eNB(s), and includes the parameters: serviceType, areaScope, qoECollectionEntityAddress, pLMNTarget, qoETarget, qoEReference and QMC configuration file.
2. The DM/EM forwards activateAreaQMCJob to impacted eNB(s), and includes the parameters: serviceType, areaScope, qoECollectionEntityAddress, pLMNTarget, qoETarget, qoEReference and QMC configuration file.
3. The eNB checks for connections where the UE has the UE capability [9] that match the criteria for serviceType in the activateAreaQMCJob.
4. When a connection is found that has the wanted UE capability [9], the eNB starts a UE request session and stores the associated QoECollectionEntityAddress, sends the message RRCConnectionReconfiguration to the UE, and includes the following: serviceType, qoEReference and QMC configuration file.
5. The access stratum in the UE sends the AT command +CAPPLEVMC to application level and includes the following: serviceType, qoEReference and QMC configuration file.
6. When the application in the serviceType starts, the QMC is initiated.
7. The application layer sends the AT command +CAPPLEVMR including a recording session indication that indicates that a session is started to the access stratum.
8. The UE sends the message MeasReportAppLayer including the recording session indication to the eNB.
9. The eNB sends a notification including the recording session indication to the NM.
10. When the QMC is completed, the recorded information is collected in a QMC report [6], [7], including qoEReference and recordingSessionId. The qoEReference, Client Id [6] and [7] in the reporting container (that represent the UE request session), and recordingSessionId are needed in the QMC collection entity for post processing purposes.
11. The application layer sends the AT command +CAPPLEVMR including qoEReference and the QMC report to the access stratum.
12. The UE sends the message MeasReportAppLayer including qoEReference and the QMC report to the eNB.
13. The eNB sends the QMC report to the MCE associated to the qoEReference.
4.2.2 Handling of measurement collection at handover in LTE
4.2.2.1 Handover between cells within an eNB
When handover is made and no Recording session id is provided, the measurement area is checked.
– If the mobile is inside the measurement area after the handover, the eNB sends in an indication that the UE is inside the measurement area in the RRCConnectionReconfiguration message [8] to the UE. The UE send the +CAPPLEVMC AT command [5] to the application to inform that recording shall start if the application becomes active (when the UE moves into the measurement area).
– If the mobile has moved outside the measurement area, there is no indication that the UE is inside the measurement area in the RRCConnectionReconfiguration message [8] from the eNB to the UE. The UE sends the +CAPPLEVMC AT command [5] to the application to inform that recording shall not be started even if the application becomes active.
4.2.2.2 Handover between eNBs
The figure 4.2.2.2-1 and the text below describes the handling at handover between eNBs.
Figure 4.2.2.2-1: Handling of QMC activation in case of handover in LTE
1. Source eNB sends the message HandoverRequest to Target eNB and includes areaScope and qoECollectionEntityAddress.
2. The target eNB checks if the target cell is inside the areaScope or not.
3. The target eNB sends the message HandoverRequestAcknowledge to the source eNB.
4. The source eNB sends the message RRCConnectionReconfiguration to the UE.
5. The access stratum in the UE sends the AT command +CAPPLEVMC to application level.
6. The UE sends the message RRCConnectionReconfigurationComplete to the eNB.
7. When the application becomes active, QMC is initiated if the UE is inside the areaScope.
8. The application layer sends the AT command +CAPPLEVMR including a recording session indication indicating that a session has started to the access stratum.
9. The UE sends the message MeasReportAppLayer including the recording session indication to the eNB.
10. The eNB sends a notification including the recording session indication to the NM.
11. When the QMC is completed, the recorded information is collected in a QMC report [6], [7]. including qoEReference and recordingSessionId. The qoEReference, Client Id [6] and [7] in the reporting container (that represent the UE request session) and recordingSessionId are needed in the QoE collection entity for post processing purposes.
12. The application layer sends the AT command +CAPPLEVMR including qoEReference and the QMC report to the access stratum.
13. The UE sends the message MeasReportAppLayer including qoEReference and the QMC report to the eNB.
14. The eNB sends the QMC report to the MCE associated to the qoEReference.
4.2.3 Deactivation of measurement collection job in LTE
4.2.3.1 Forced deactivation
When the operator technician or the management application wants to deactivate a measurement collection job, the management system sends the deactivateQMCJob operation [3] to the eNB. The eNB sets the network request session to ended, but does not delete the UE request session id and the Collection Entity Address parameters [3], as the UE still may send reports which shall be send to the collection centre. For UE request sessions which have reported that a recording session is started, the eNB sends the RRCConnectionReconfiguration message [8] to relevant UEs. The RRCConnectionReconfiguration message is including measConfigAppLayer set to discard application layer measurement report information in otherConfig [8]. The Access stratum sends +CAPPLEVMC AT command [5] to the application with the discard request. The application stops the recording session and stops recording of the requested information. The UE request session id and the Collection Entity Address parameters [3] in the eNB are deleted when the UE request session is ended.
4.2.3.2 Deactivation of recording session
Regardless of whether the pre-set time has elapsed or not, the recording session continues to be active until the session for the application is ended.