1. A terminal apparatus for communicating with a base station apparatus by using a primary cell and an LAA (Licensed Assisted Access) secondary cell, the terminal apparatus comprising:reception circuitry configured to receive information indicating a parameter skipUplinkTxDynamic; and
transmission circuitry configured to perform an uplink transmission, wherein
the transmission circuitry is further configured to:
skip a first uplink transmission at least based on a first configured uplink grant for the LAA secondary cell, the first configured uplink grant corresponding to the first uplink transmission,
skip a second uplink transmission in the primary cell in a case that the parameter skipUplinkTxDynamic is configured, and
skip a third uplink transmission in the LAA secondary cell in the case that the parameter skipUplinkTxDynamic is configured,
the second uplink transmission corresponds to a third uplink grant corresponding to a C-RNTI, and
the third uplink transmission corresponds to a fourth uplink grant corresponding to the C-RNTI.