In a case where the core network updates the priority information of the CIoT 5GS optimization stored in the UE in the UE configuration update procedure, the core network may transmit the configuration update command message including the 61st identification information to the UE. In a case where the core network updates the support information of the control plane CIoT 5GS optimization stored in the UE in the UE configuration update procedure, the core network may transmit the configuration update command message including the 62nd identification information to the UE. In a case where the core network updates the support information of the user plane CIoT 5GS optimization stored in the UE in the UE configuration update procedure, the core network may transmit the configuration update command message including the 63rd identification information to the UE. In a case where the core network updates the support information of the data communication using the communication path of the user plane stored in the UE in the UE configuration update procedure, the core network may transmit the configuration update command message including the 64th identification information to the UE.
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 in the UE configuration update procedure, the core network may transmit the configuration update command message including the 61st identification information and/or the 62nd identification information to the UE.