A terminal apparatus configured to communicate with a base station apparatus by using a primary cell and a secondary cell, the terminal apparatus comprising: a reception processing unit configured to receive downlink data, receive radio resource control, RRC, information including configured uplink grant configuration information for the secondary cell and configured downlink assignment configuration information for the secondary cell, receive downlink control information, DCI, and receive an SCell Activation/Deactivation control element, CE; a transmission processing unit configured to transmit uplink data; and a serving cell state managing unit configured to: control an sCellDeactivationTimer with which the secondary cell is configured, and configure, a configured uplink grant based on the configured uplink grant configuration information, wherein the configured uplink grant is a configured grant Type 1, and a configured downlink assignment based on the configured downlink assignment configuration information, wherein the serving cell state managing unit is configured to activate the secondary cell by using the SCell Activation/Deactivation CE and start the sCellDeactivationTimer, wherein the serving cell state managing unit does not restart the sCellDeactivationTimer without scheduling, through a physical downlink control channel, PDCCH, the uplink data and the downlink data, and in a case that the transmission processing unit transmits the uplink data based on the configured grant Type 1, the serving cell state managing unit restarts the sCellDeactivationTimer. a reception processing unit configured to receive downlink data, receive radio resource control, RRC, information including configured uplink grant configuration information for the secondary cell and configured downlink assignment configuration information for the secondary cell, receive downlink control information, DCI, and receive an SCell Activation/Deactivation control element, CE; a transmission processing unit configured to transmit uplink data; and a serving cell state managing unit configured to: control an sCellDeactivationTimer with which the secondary cell is configured, and configure, a configured uplink grant based on the configured uplink grant configuration information, wherein the configured uplink grant is a configured grant Type 1, and a configured downlink assignment based on the configured downlink assignment configuration information, wherein control an sCellDeactivationTimer with which the secondary cell is configured, and configure, a configured uplink grant based on the configured uplink grant configuration information, wherein the configured uplink grant is a configured grant Type 1, and a configured downlink assignment based on the configured downlink assignment configuration information, wherein a configured uplink grant based on the configured uplink grant configuration information, wherein the configured uplink grant is a configured grant Type 1, and a configured downlink assignment based on the configured downlink assignment configuration information, wherein the serving cell state managing unit is configured to activate the secondary cell by using the SCell Activation/Deactivation CE and start the sCellDeactivationTimer, wherein the serving cell state managing unit does not restart the sCellDeactivationTimer without scheduling, through a physical downlink control channel, PDCCH, the uplink data and the downlink data, and in a case that the transmission processing unit transmits the uplink data based on the configured grant Type 1, the serving cell state managing unit restarts the sCellDeactivationTimer.