| 摘要 |
<p>Each of mobile station apparatuses 2 receives downlink allocation information from a base station apparatus in a downlink control channel (PDCCH) (Step S10). Next, the mobile station apparatus 2 performs demodulation, decoding, and cyclic redundancy check (CRC) on the downlink shared channel (PDSCH) in accordance with the downlink allocation information received in Step S10 (Step S11). Next, the mobile station apparatus 2 generates an acknowledgement (ACK) or a non-acknowledgement (NACK) in accordance with the result of the cyclic redundancy check (CRC) in Step S12 (Step S12). Next, the mobile station apparatus 2 selects the lowest number and the second lowest number of the numbers of the control channel elements (CCEs) in which the downlink allocation information is received (Step S13). Next, based on the selected numbers, the mobile station apparatus 2 obtains a physical resource block (PRB), as well as a cyclic shift and an orthogonal code sequence in the time domain for each transmission antenna, and spreads the acknowledgement (ACK) or the non-acknowledgement (NACK) and the uplink pilot channel (Step S14). Next, the acknowledgment (ACK) or the non-acknowledgement (NACK) and the uplink pilot channel after the code spread are arranged in the physical resource block (PRB) obtained for the antenna, and then are transmitted to the base station apparatus (Step S15). Thereby, the mobile station apparatus transmits the signals in consideration of compatibility with LTE by using the same channel as in LTE to the maximum extent, and thus a transmission diversity gain can be obtained.</p> |
