A user device for a mobile communication system employing a multicarrier scheme, the user device comprising: a control signal generating unit (231; 232; 241; 242) generating a control signal; and a transmitting unit transmitting the control signal to a base station, wherein the control signal is mapped to multiple frequency bands that are provided across a subframe but discontinuous in a frequency domain; and each of the frequency bands includes subcarriers used in orthogonal frequency division multiplexing, OFDM, the user device further comprising: a data signal generating unit (231; 232; 241; 242) generating a data signal, wherein the data signal is mapped to multiple frequency bands provided separately from the frequency bands for the control signal; the frequency bands for the data signal are provided across the subframe but discontinuous in the frequency domain; and each of the frequency bands for the data signal includes subcarriers used in OFDM, wherein in each of the frequency bands for the control signal, the subframe includes multiple OFDM symbols, and the multiple OFDM symbols include a first number of OFDM symbols for transmitting a pilot channel and a second number of OFDM symbols for transmitting control information other than the pilot channel; each of the second number of OFDM symbols includes symbol elements representing the control information; and said user device being characterised in that each of the second number of OFDM symbols is multiplied by a spreading code having a sequence length that equals the second number. a control signal generating unit (231; 232; 241; 242) generating a control signal; and a transmitting unit transmitting the control signal to a base station, wherein the control signal is mapped to multiple frequency bands that are provided across a subframe but discontinuous in a frequency domain; and each of the frequency bands includes subcarriers used in orthogonal frequency division multiplexing, OFDM, the user device further comprising: a data signal generating unit (231; 232; 241; 242) generating a data signal, wherein the data signal is mapped to multiple frequency bands provided separately from the frequency bands for the control signal; the frequency bands for the data signal are provided across the subframe but discontinuous in the frequency domain; and each of the frequency bands for the data signal includes subcarriers used in OFDM, wherein in each of the frequency bands for the control signal, the subframe includes multiple OFDM symbols, and the multiple OFDM symbols include a first number of OFDM symbols for transmitting a pilot channel and a second number of OFDM symbols for transmitting control information other than the pilot channel; each of the second number of OFDM symbols includes symbol elements representing the control information; and said user device being characterised in that each of the second number of OFDM symbols is multiplied by a spreading code having a sequence length that equals the second number. a data signal generating unit (231; 232; 241; 242) generating a data signal, wherein the data signal is mapped to multiple frequency bands provided separately from the frequency bands for the control signal; the frequency bands for the data signal are provided across the subframe but discontinuous in the frequency domain; and each of the frequency bands for the data signal includes subcarriers used in OFDM, wherein in each of the frequency bands for the control signal, the subframe includes multiple OFDM symbols, and the multiple OFDM symbols include a first number of OFDM symbols for transmitting a pilot channel and a second number of OFDM symbols for transmitting control information other than the pilot channel; each of the second number of OFDM symbols includes symbol elements representing the control information; and said user device being characterised in that each of the second number of OFDM symbols is multiplied by a spreading code having a sequence length that equals the second number.