A method includes determining, by a user equipment (UE), to use a first radio access technology, and triggering, by the UE, a first event to disable a second radio access technology while the UE currently uses the second radio access technology. The first event indicates that a base station fails to configure a secondary cell or instructs the base station to delete a configured secondary cell. The secondary cell is a secondary cell of the second radio access technology on the unlicensed spectrum.