A terminal apparatus for communicating with a base station apparatus, the terminal apparatus comprising: specifying means for detecting a signal from the base station apparatus and specifying a number of repeated transmissions that were used to communicate a predetermined amount of data from the base station apparatus to the terminal apparatus; and transmission means for transmitting, to the base station apparatus, one predetermined signal that corresponds to a preamble identifier corresponding to the number of repeated transmissions specified by the specifying means from a plurality of predetermined signals each of which corresponds to one of a plurality of preamble identifiers that are known in the terminal apparatus and the base station apparatus and respectively correspond to different numbers of repeated transmissions to be used to communicate the predetermined amount of data; wherein each of the plurality of predetermined signals corresponds to a combination of the number of repeated transmissions to be used to communicate the predetermined amount of data from the terminal apparatus to the base station apparatus and the number of repeated transmissions that were used to communicate the predetermined amount of data from the base station apparatus to the terminal apparatus; and wherein the transmission means is configured to specify, using a first number of repeated transmissions, one predetermined signal corresponding to a combination of the first number of repeated transmissions and a second number of repeated transmissions specified by the specifying means from the plurality of predetermined signals, and to transmit the one predetermined signal to the base station apparatus. specifying means for detecting a signal from the base station apparatus and specifying a number of repeated transmissions that were used to communicate a predetermined amount of data from the base station apparatus to the terminal apparatus; and transmission means for transmitting, to the base station apparatus, one predetermined signal that corresponds to a preamble identifier corresponding to the number of repeated transmissions specified by the specifying means from a plurality of predetermined signals each of which corresponds to one of a plurality of preamble identifiers that are known in the terminal apparatus and the base station apparatus and respectively correspond to different numbers of repeated transmissions to be used to communicate the predetermined amount of data; wherein each of the plurality of predetermined signals corresponds to a combination of the number of repeated transmissions to be used to communicate the predetermined amount of data from the terminal apparatus to the base station apparatus and the number of repeated transmissions that were used to communicate the predetermined amount of data from the base station apparatus to the terminal apparatus; and wherein the transmission means is configured to specify, using a first number of repeated transmissions, one predetermined signal corresponding to a combination of the first number of repeated transmissions and a second number of repeated transmissions specified by the specifying means from the plurality of predetermined signals, and to transmit the one predetermined signal to the base station apparatus.