1. A terminal apparatus comprising:reception circuitry that receives a PDCCH including downlink control information; and
transmission circuitry that transmits a PUSCH including a transport block, based on detection of the PDCCH, wherein
the transmission circuitry triggers non-adaptive PUSCH retransmission without waiting for a feedback for transmission of the PUSCH in a bundle, when a parameter TTIbundling of an RRC layer is configured to be TRUE,
a size of the transport block is given at least based on whether the parameter TTIbundling of the RRC layer is configured to be TRUE,
when the parameter TTIbundling of the RRC layer is not configured to be TRUE, the size of the transport block is given based on a value of a transport block size index and a specific value, the specific value being at least based on which one of UpPTS of a special subframe and an uplink subframe is used for transmitting the transport block, and
when (a) the parameter TTIbundling of the RRC layer is not configured to be TRUE and (b) the transport block is transmitted in the UpPTS, the specific value is the largest integer value between a value given by a floor function and 1, where the floor function takes a value which is equal to a product of a total number of assigned physical resource blocks and a decimal larger than 0 and smaller than 1.