Radio transmission device and radio transmission method
First Claim
1. A mobile station apparatus comprising:
- reference signal (RS) phase control circuitry, which,(a) when the mobile station apparatus transmits a channel quality indicator (CQI) signal in a subframe in which a response (ACK/NACK) signal is not transmitted, multiplies the same phase with two RSs mapped to Nth symbol and Mth symbol of a transmission format; and
(b) when the mobile station apparatus transmits a CQI signal in a subframe in which a response (ACK/NACK) signal is transmitted, multiplies opposite phases with two RSs mapped to the Nth symbol and the Mth symbol of the transmission format; and
a transmitter, coupled to the RS phase control circuitry, which, in operation, transmits the CQI signal including the phase-multiplied RSs;
wherein, among sequences used to spread the response (ACK/NACK) signal, more sequences have values corresponding to the Nth symbol and the Mth symbol in the same phase than sequence(s) having those values in opposite phases.
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Abstract
It is possible to improve the CQI reception performance even when a delay is caused in a propagation path, a transmission timing error is caused, or a residual interference is generated between cyclic shift amounts of different ZC sequences. For the second symbol and the sixth symbol of the ACK/NACK signal which are multiplexed by RS of CQI, (+, +) or (−, −) is applied to a partial sequence of the Walsh sequence. For RS of CQI transmitted from a mobile station, + is added as an RS phase of the second symbol and − is added as an RS phase of the sixth symbol. A base station (100) receives multiplexed signals of ACK/NACK signals and CQI signals transmitted from a plurality of mobile stations. An RS synthesis unit (119) performs synthesis by aligning the RS phase of CQI.
38 Citations
24 Claims
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1. A mobile station apparatus comprising:
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reference signal (RS) phase control circuitry, which, (a) when the mobile station apparatus transmits a channel quality indicator (CQI) signal in a subframe in which a response (ACK/NACK) signal is not transmitted, multiplies the same phase with two RSs mapped to Nth symbol and Mth symbol of a transmission format; and (b) when the mobile station apparatus transmits a CQI signal in a subframe in which a response (ACK/NACK) signal is transmitted, multiplies opposite phases with two RSs mapped to the Nth symbol and the Mth symbol of the transmission format; and a transmitter, coupled to the RS phase control circuitry, which, in operation, transmits the CQI signal including the phase-multiplied RSs; wherein, among sequences used to spread the response (ACK/NACK) signal, more sequences have values corresponding to the Nth symbol and the Mth symbol in the same phase than sequence(s) having those values in opposite phases. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An integrated circuit comprising:
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a reference signal (RS) phase control circuitry, which, (a) when transmitting a channel quality indicator (CQI) signal in a subframe in which a response (ACK/NACK) signal is not transmitted, multiplies the same phase with two RSs mapped to Nth symbol and Mth symbol of a transmission format; and (b) when transmitting a CQI signal in a subframe in which a response (ACK/NACK) signal is transmitted, multiplies opposite phases with two RSs mapped to the Nth symbol and the Mth symbol of the transmission format; and transmission control circuitry, coupled to the RS phase control circuitry, which, in operation, controls transmission of the CQI signal including the phase-multiplied RSs; wherein, among sequences used to spread the response (ACK/NACK) signal, more sequences have values corresponding to the Nth symbol and the Mth symbol in the same phase than sequence(s) having those values in opposite phases. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A base station apparatus comprising:
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a receiver, which, in operation, receive signals transmitted from a mobile station apparatus; and a demodulator, coupled to the receiver, which, (a) when the base station apparatus receives from the mobile station apparatus a channel quality indicator (CQI) signal in a subframe in which a response (ACK/NACK) signal is not received, demodulates the CQI signal including two reference signals (RSs) mapped to Nth symbol and Mth symbol of a transmission format, wherein the two RSs are in the same phase; and (b) when the base station apparatus receives from the mobile station apparatus a CQI signal in a subframe in which a response (ACK/NACK) signal is received, demodulates the CQI signal and the response (ACK/NACK) signal wherein the CQI signal includes two RSs mapped to the Nth symbol and the Mth symbol in opposite phases; wherein, among sequences used to spread the response (ACK/NACK) signal, more sequences have values corresponding to the Nth symbol and the Mth symbol in the same phase than sequence(s) having those values in opposite phases. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An integrated circuit comprising:
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reception control circuitry, which, in operation, receives signals transmitted from a mobile station apparatus; and a demodulator, coupled to the reception control circuitry, which, (a) when receiving, from the mobile station apparatus, a channel quality indicator (CQI) signal in a subframe in which a response (ACK/NACK) signal is not received, demodulates the CQI signal including two reference signals (RSs) mapped to Nth symbol and Mth symbol of a transmission format, wherein the two RSs are in the same phase; and (b) when receiving, from the mobile station apparatus, a CQI signal in a subframe in which a response (ACK/NACK) signal is received, demodulates the CQI signal and the response (ACK/NACK) signal wherein the CQI signal includes two RSs mapped to the Nth symbol and the Mth symbol in opposite phases; wherein, among sequences used to spread the response (ACK/NACK) signal, more sequence have values corresponding to the Nth symbol and the Mth symbol in the same phase than sequence(s) having those values in opposite phases. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification