Radio communication device and radio communication method
The present invention makes it possible to obtain the transmission diversity effect by applying a CDD while reducing the inter-code interference when performing a code multiplexing. When an Ack/Nack signal is transmitted from a user terminal to a base station in an upstream control channel by using an Ack/Nack resource, the signal is code-multiplexed by using a code sequence containing an orthogonal sequence and a cyclic-shifted sequence and transmitted from a plurality of user terminals to the base station. Upon using an aggregation size indicating the number of control signals of the downstream control channel, if the aggregation size is greater than one, it is determined that no resource located at the right of the axis of the cyclic-shifted amount of the cyclic-shifted sequence in the same orthogonal code of the orthogonal sequence is used, and the Ack/Nack signal to which CDD is applied from a plurality of antennas is transmitted by using a resource ACK # 0 allocated to the own device and an unused resource ACK # 1 , which have the same orthogonal code, but have different cyclic-shifted amounts.
1. A transmitting apparatus comprising:
a transmission signal generating section configured to generate a transmission signal by multiplying a response signal with a cyclically shifted sequence defined by a cyclic shift value of a plural cyclic shift values and by spreading the multiplied response signal with an orthogonal sequence of plural orthogonal sequences, wherein the orthogonal sequence and the cyclic shift value are determined from a resource index, and the resource index is associated with a control channel element (CCE) number which indicates a number of a first CCE of one or more CCEs used to transmit a control signal in a downlink control channel; and
a transmitting section configured to transmit the transmission signal using one or more antenna ports, wherein when a first antenna port and a second antenna port are used, said transmission signal generating section uses a first orthogonal sequence and a first cyclic shift value that are determined by a first resource index for the transmission signal transmitted using the first antenna port, and uses a second orthogonal sequence and a second cyclic shift value that are determined by a second resource index for the transmission signal transmitted using the second antenna port, the second resource index being a number which equals the first resource index plus one.
2. The transmitting apparatus according to claim 1 , wherein the first cyclic shift value determined from the first resource index and the second cyclic shift value determined from the second resource index are next to each other at a set interval.
3. The transmitting apparatus according to claim 1 , wherein the first orthogonal sequence determined from the first resource index is same as the second orthogonal sequence determined from the second resource index.
4. The transmitting apparatus according to claim 1 , wherein:
six cyclic shift values with # 0 , # 2 , # 4 , # 6 , # 8 and # 10 of twelve cyclic shift values, which are represented by consecutive numbers # 0 to # 11 in a direction in which a cyclic shift value is incremented by a set value, are associated with one of the plural orthogonal sequences; and
two cyclic shift values, numbers of which are different by two, of the six cyclic shift values are determined from the first resource index and the second resource index, respectively.
5. The transmitting apparatus according to claim 4 , wherein six cyclic shift values with # 1 , # 3 , # 5 , # 7 , # 9 and # 11 of the twelve cyclic shift values, are associated with another of the plural orthogonal sequences.
6. The transmitting apparatus according to claim 1 , wherein said transmission signal generating section scrambles the response signal according to the resource index.
7. The transmitting apparatus according to claim 1 , wherein said transmission signal generating section scrambles the response signal depending on the cyclic shift value determined from the resource index.
8. The transmitting apparatus according to claim 7 , wherein said transmission signal generating section scrambles the response signal such that a phase of a response signal, for which one of two cyclic shift values that are associated with one of the plural orthogonal sequences and that are next to each other at a set interval is used, is rotated by 90 degree with respect to a phase of a response signal, for which the other of two cyclic shift values is used.
9. The transmitting apparatus according to claim 1 , wherein said transmission signal generating section scrambles the response signal such that a phase of a response signal, for which the first resource index is used, is same as a phase of the response signal, for which the second resource index is used.
10. A receiving apparatus comprising:
a transmitting section configured to transmit a control signal on a downlink control channel using one or more control channel elements (CCEs);
a receiving section configured to receive a response signal, which is multiplied with a cyclically shifted sequence defined by a cyclic shift value of plural cyclic shift values and spread with an orthogonal sequence of plural orthogonal sequences, which is transmitted using one or more antenna ports, wherein the orthogonal sequence and the cyclic shift value are determined from a resource index, and the resource index is associated with a CCE number which indicates a number of a first CCE of the one or more CCEs, and wherein when the response signal is transmitted using a first antenna port and a second antenna port, a first orthogonal sequence and a first cyclic shift value that are determined by a first resource index are used for the response signal transmitted using the first antenna port, and a second orthogonal sequence and a second cyclic shift value that are determined by a second resource index are used for the response signal transmitted using the second antenna port, the second resource index being a number which equals the first response index plus one.
11. The receiving apparatus according to claim 10 , wherein the first cyclic shift value determined from the first resource index and the second cyclic shift value determined from the second resource index are next to each other at a set interval.
12. The receiving apparatus according to claim 10 , wherein the first orthogonal sequence determined from the first resource index is same as the second orthogonal sequence determined from the second resource index.
13. The receiving apparatus according to claim 10 , wherein:
six cyclic shift values with # 0 , # 2 , # 4 , # 6 , # 8 and # 10 of twelve cyclic shift values, which are represented by consecutive numbers # 0 to # 11 in a direction in which a cyclic shift value is incremented by a set value, are associated with one of the plural orthogonal sequences; and
two cyclic shift values, numbers of which are different by two, of the six cyclic shift values are determined from the first resource index and the second resource index, respectively.
14. The receiving apparatus according to claim 13 , wherein six cyclic shift values with # 1 , # 3 , # 5 , # 7 , # 9 and # 11 of the twelve cyclic shift values, are associated with another of the plural orthogonal sequences.
15. The receiving apparatus according to claim 10 , wherein the response signal is scrambled according to the resource index.
16. The receiving apparatus according to claim 10 , wherein the response signal is scrambled depending on the cyclic shift value determined from the resource index.
17. The receiving apparatus according to claim 16 , wherein the response signal is scrambled such that a phase of a response signal, for which one of two cyclic shift values that are associated with one of the plural orthogonal sequences and that are next to each other at a set interval is used, is rotated by 90 degree with respect to a phase of a response signal, for which the other of two cyclic shift values is used.
18. The receiving apparatus according to claim 10 , wherein the response signal is scrambled such that a phase of a response signal, for which the first resource index is used, is same as a phase of a response signal, for which the second resource index is used.
19. A response signal transmitting method comprising:
generating a transmission signal by multiplying a response signal with a cyclically shifted sequence defined by a cyclic shift value of plural cyclic shift values and by spreading the multiplied response signal with an orthogonal sequence of plural orthogonal sequences, wherein the orthogonal sequence and the cyclic shift value is determined from a resource index, the resource index is associated with a control channel element (CCE) number which indicates a number of a first CCE of one or more CCEs used to transmit a control signal in a downlink control channel; and
transmitting the response signal using one or more antenna ports, wherein when a first antenna port and a second antenna port are used, a first orthogonal sequence and a first cyclic shift value that are determined by a first resource index are used for the transmission signal transmitted using the first antenna port, and a second orthogonal sequence and a second cyclic shift value that are determined by a second resource index are used for the transmission signal transmitted using the second antenna port, the second resource index being a number which equals the first resource index plus one.
20. A response signal receiving method comprising:
transmitting a control signal on a downlink control channel using one or more control channel elements (CCEs);
receiving a response signal, which is multiplied with a cyclically shifted sequence defined by a cyclic shift value of plural cyclic shift values and spread with an orthogonal sequence of plural orthogonal sequences, which is transmitted is using one or more antenna ports, wherein the orthogonal sequence and the cyclic shift value are determined from a resource index, the resource index is associated with a CCE number which indicates a number of a first CCE of the one or more CCEs, and wherein when the response signal is transmitted using a first antenna port and a second antenna port, a first orthogonal sequence and a first cyclic shift value that are determined by a first resource index are used for the response signal transmitted using the first antenna port, and a second orthogonal sequence and a second cyclic shift value that determined by a second resource index are used for the response signal transmitted using the second antenna port, the second resource index being a number which equals the first resource index plus one.
21. An integrated circuit for supporting communication comprising:
a transmission signal generating section that controls processing of generating a transmission signal by multiplying a response signal with a cyclically shifted sequence defined by a cyclic shift value of plural cyclic shift values and by spreading the multiplied response signal with an orthogonal sequence of plural orthogonal sequences, wherein the orthogonal sequence and the cyclic shift value are determined by a resource index, the resource index is associated with a control channel element (CCE) number which indicates a number of a first CCE of one or more CCEs used to transmit a control signal in a downlink control channel; and
a transmission controlling section that controls processing of transmitting the transmission signal using one or more antenna ports, wherein when a first antenna port and a second antenna port are used, said transmission signal generating section uses a first orthogonal sequence and a first cyclic shift value that are determined by a first resource index for the transmission signal transmitted using the first antenna port, and uses a second orthogonal sequence and a second cyclic shift value that are determined by a second resource index for the transmission signal transmitted using the second antenna port, the second resource index being a number which equals the first resource index plus one.
22. An integrated circuit for supporting communication comprising:
a transmission controlling section that controls processing of transmitting a control signal on a downlink control channel using one or more control channel elements (CCEs);
a reception controlling section that controls processing of receiving a response signal, which is multiplied with a cyclically shifted sequence defined by a cyclic shift value of plural cyclic shift values and spread with an orthogonal sequence of plural orthogonal sequences, wherein the orthogonal sequence and the cyclic shift value are determined from a resource index, and the resource index is associated with a CCE number which indicates a number of a first CCE of the one or more CCEs, and wherein when the response signal is transmitted using a first antenna port and a second antenna port, a first orthogonal sequence and a first cyclic shift value that are determined by a first resource index are used for the response signal transmitted using the first antenna port, and a second orthogonal sequence and a second cyclic shift value that determined by a second resource index are used for the response signal transmitted using the second antenna port, the second resource index being a number which equals the first resource index plus one.