In a case where the core network changes the CIoT 5GS optimization to be used from the user plane CIoT 5GS optimization to the control plane CIoT 5GS optimization due to the UE initiating the registration procedure after the UE configuration update procedure is completed, the core network may transmit the configuration update command message including the 69th identification information to the UE together with the 61st identification information and/or the 62nd identification information.
In a case where the core network changes the CIoT 5GS optimization to be used from the control plane CIoT 5GS optimization to the user plane CIoT 5GS optimization in the UE configuration update procedure, the core network may transmit the configuration update command message including the 61 st identification information, the 63rd identification information, and/or the 64th identification information to the UE.
In a case where the core network changes the CIoT 5GS optimization to be used from the control plane CIoT 5GS optimization to the user plane CIoT 5GS optimization due to the UE initiating the registration procedure after the UE configuration update procedure is completed, the core network may transmit the configuration update command message including the 69th identification information together with the 61st identification information, the 63rd identification information, and/or the 64th identification information to the UE.