A radio terminal configured to perform Licensed Assisted Access, LAA, which is carrier aggregation between a primary cell operated in a licensed spectrum and a secondary cell operated in an unlicensed spectrum or shared spectrum, the radio terminal comprising: a transceiver configured to receive , from a radio station that operates the primary cell and the secondary cell, control information together with uplink scheduling information on a Physical Downlink Control Channel, PDCCH, wherein the control information includes information regarding regulations for radio communication on the unlicensed spectrum or shared spectrum including Listen Before Talk, LBT, type information for uplink LBT, and the uplink LBT includes sensing a channel, on which one or more uplink transmissions on the secondary cell are to be performed, to determine whether the channel is idle or busy; and at least one processor configured to: recognize , based on the control information and the uplink scheduling information, whether the uplink LBT needs to be performed; in a case where the uplink LBT is needed, perform the sensing of the channel corresponding to one of a first LBT type and a second LBT type indicated by the LBT type information, and if the channel is available, perform uplink data transmission on the unlicensed spectrum or shared spectrum in accordance with the uplink scheduling information, otherwise not perform the uplink data transmission on the unlicensed spectrum or shared spectrum; and in a case where the uplink LBT is not needed, perform the uplink data transmission on the unlicensed spectrum or shared spectrum without performing the sensing of the channel. a transceiver configured to receive , from a radio station that operates the primary cell and the secondary cell, control information together with uplink scheduling information on a Physical Downlink Control Channel, PDCCH, wherein the control information includes information regarding regulations for radio communication on the unlicensed spectrum or shared spectrum including Listen Before Talk, LBT, type information for uplink LBT, and the uplink LBT includes sensing a channel, on which one or more uplink transmissions on the secondary cell are to be performed, to determine whether the channel is idle or busy; and at least one processor configured to: recognize , based on the control information and the uplink scheduling information, whether the uplink LBT needs to be performed; in a case where the uplink LBT is needed, perform the sensing of the channel corresponding to one of a first LBT type and a second LBT type indicated by the LBT type information, and if the channel is available, perform uplink data transmission on the unlicensed spectrum or shared spectrum in accordance with the uplink scheduling information, otherwise not perform the uplink data transmission on the unlicensed spectrum or shared spectrum; and in a case where the uplink LBT is not needed, perform the uplink data transmission on the unlicensed spectrum or shared spectrum without performing the sensing of the channel. recognize , based on the control information and the uplink scheduling information, whether the uplink LBT needs to be performed; in a case where the uplink LBT is needed, perform the sensing of the channel corresponding to one of a first LBT type and a second LBT type indicated by the LBT type information, and if the channel is available, perform uplink data transmission on the unlicensed spectrum or shared spectrum in accordance with the uplink scheduling information, otherwise not perform the uplink data transmission on the unlicensed spectrum or shared spectrum; and in a case where the uplink LBT is not needed, perform the uplink data transmission on the unlicensed spectrum or shared spectrum without performing the sensing of the channel. <EOS>