Section: 21.2.4 QoE Measurement Handling in RRC_IDLE and RRC_INACTIVE States
Content: If the UE enters RRC_INACTIVE, the UE AS configuration for the QoE is stored in the UE Inactive AS context. If the UE enters RRC_IDLE state, the UE releases all application layer measurement configurations except the application layer configurations explicitly indicated by the gNB as applicable in RRC_IDLE and RRC_INACTIVE states. For application measurement configurations applicable in RRC_IDLE and RRC_INACTIVE states, the UE continues on-going QoE measurement collection when entering RRC_IDLE or RRC_INACTIVE state, and also when returning to RRC_CONNECTED state. The UE may also start QoE collection according to the stored QoE configuration while in RRC_IDLE or RRC_INACTIVE state. The UE keeps the application layer measurement configurations but does not start new QoE sessions when it is outside of the area scope for QoE configurations in RRC_IDLE and/or RRC_INACTIVE state. The UE stores the application layer measurement reports generated while in RRC_IDLE and/or RRC_INACTIVE state in the AS layer. The gNB can retrieve the application layer measurement reports/configurations and session status indication by configuring SRB4 or SRB5 after it receives application layer measurement reports/configurations availability indication. The UE can send idle/inactive application layer measurement reports to the gNB only when it has moved to RRC_CONNECTED state due to other reasons. Upon UE's transition from RRC_IDLE to RRC_CONNECTED, the gNB serving the UE should ensure that it does not release an already configured signalling-based QoE measurement configuration for the sake of configuring a new management-based QoE measurement configuration.