A terminal apparatus for communicating with a base station apparatus, the terminal apparatus including: a multiplexing unit configured to map a PTRS signal generated based on a pseudo-random code to a resource element; and a transmitter configured to transmit a PUSCH, wherein the multiplexing unit maps the PTRS signal to a subcarrier based on at least an offset of a frequency position, a C-RNTI, the number of resource blocks to be scheduled, and a frequency density of the PTRS, and the transmitter transmits the PUSCH to which the PTRS is mapped.