21.3 QoE Measurement Continuity for Mobility

QoE measurement collection continuity for intra-system intra-RAT/inter-RAT handover is supported, with the Area Scope parameters configured by the OAM, where the network is responsible for keeping track of whether the UE is inside or outside the area scope. A UE continues an ongoing QoE measurement even if it leaves the area scope, unless the network indicates to the UE to release the application layer measurement configuration.

For handover, the source gNB may transmit the information related to one or more application layer measurement configurations of the UE to the target gNB via XnAP or NGAP. For signalling-based QoE, the service type indication, the QoE reference, and, optionally, the container for application layer measurement configuration, MCE IP address, measurement configuration application layer ID, MDT alignment information, area scope, slice support list for QMC, available RAN visible QoE metrics, QoE measurement session status, MBS communication service type, and assistance information for QoE measurement are passed to the target gNB. For management-based QoE, the QoE reference, service type indication, and, optionally, the measurement configuration application layer ID, the MCE IP address, area scope, slice support list for QMC, MBS communication service type, assistance information for QoE measurement and QoE measurement session status are passed to the target gNB. For RRC_INACTIVE state mobility, QoE measurement configuration(s) of a specific UE can be retrieved from the gNB hosting the UE context when the UE resumes to the RRC_CONNECTED state.

For signalling-based QoE, at handover to a target gNB that supports QoE measurement collection, the target gNB decides which of the application layer measurement configurations should be kept and which should be released, e.g., based on application layer measurement configuration information received from the source gNB in Xn/NG signalling.

When the UE is handed over to a target gNB that does not support QMC, the UE releases all configured application layer measurement configurations.

The continuity of QoE measurement configuration and reporting in NR-DC scenario is supported as specified in TS 37.340 [21].

QoE measurement collection continuity for intra-system inter-RAT handover is supported.

For intra-5GC handover from a source gNB to a target ng-eNB, measurements continuity for only one QoE measurement configuration can be supported when the UE connects to the target ng-eNB. The source gNB decides which QoE measurement to keep and sends the information about this QoE measurement to the target ng-eNB. The UE releases all NR QoE configuration(s) and it applies the LTE QoE configuration, if received from the target ng-eNB.

For intra-5GC handover from a source ng-eNB to a target gNB, the UE releases the LTE QoE configuration and it applies the NR QoE configuration(s), if received from the target gNB.