Radio communication apparatus and radio communication method
View Patent ↗Provided is a radio communication device which can make Acknowledgement (ACK) reception quality and Negative Acknowledgement (NACK) reception quality to be equal to each other. The device includes: a scrambling unit ( 214 ) which multiplies a response signal after modulated, by a scrambling code “1” or “e −j(π/2) ” so as to rotate a constellation for each of response signals on a cyclic shift axis; a spread unit ( 215 ) which performs a primary spread of the response signal by using a Zero Auto Correlation (ZAC) sequence set by a control unit ( 209 ); and a spread unit ( 218 ) which performs a secondary spread of the response signal after subjected to the primary spread, by using a block-wise spread code sequence set by the control unit ( 209 ).
1. A device comprising:
a transmitter which, in operation, transmits to a terminal: (i) control information on a control channel element (CCE), and (ii) data; and
a receiver which, in operation, receives a response signal for the data, the response signal being transmitted from the terminal using a physical uplink control channel that is mapped to a resource whose index is associated with a CCE number of said CCE,
wherein the response signal is multiplied at the terminal with a sequence defined by one of cyclic shift values, said one of cyclic shift values being determined from the index of the resource, and the response signal is multiplied at the terminal by 1 when the index is even, and by e j(π/2) when the index is odd.
2. The device according to claim 1 , wherein the index of the resource corresponds one-to-one to the CCE number.
3. The device according to claim 1 , wherein the control information includes resource assignment information for the data.
4. The device according to claim 1 , wherein said transmitter, in operation, transmits the control information on one or a plurality of the CCEs with consecutive CCE number(s), wherein the index of the resource is associated with the first CCE number of the CCEs used for transmission of the control information.
5. The device according to claim 1 , further comprising circuitry, which operates at least one of:
dispreading the response signal; and
descrambling the response signal.
6. The device according to claim 1 , wherein the response signal is multiplied at the terminal by 1 or e j(π/2) depending on said one of the cyclic shift values.
7. The device according to claim 1 , wherein the response signal is multiplied at the terminal by 1 or e j(π/2) depending on the sequence defined by said one of the cyclic shift values.
8. The device according to claim 1 , wherein the response signal is spread at the terminal with one of orthogonal sequences, said one of the orthogonal sequences being determined from the index of the resource.
9. The device according to claim 8 , wherein the response signal is multiplied at the terminal by 1 when the resource is one of two resources, from which the same orthogonal sequence out of the orthogonal sequences is determined and from which two cyclic shift values that are next to each other at a set interval are determined, and by e j(π/2) when the resource is the other of the two resources.
10. The device according to claim 1 , wherein the response signal is an Acknowledgment (ACK) or Negative Acknowledgement (NACK) signal.
11. A method comprising:
transmitting, to a terminal: (i) control information on a control channel element (CCE), and (ii) data; and
receiving a response signal for the data, the response signal being transmitted from the terminal using a physical uplink control channel that is mapped to a resource whose index is associated with a CCE number of said CCE,
wherein the response signal is multiplied at the terminal with a sequence defined by one of cyclic shift values, said one of cyclic shift values being determined from the index of the resource, and the response signal is multiplied at the terminal by 1 when the index is even, and by e j(π/2) when the index is odd.
12. The method according to claim 11 , wherein the index of the resource corresponds one-to-one to the CCE number.
13. The method according to claim 11 , wherein the control information includes resource assignment information for the data.
14. The method according to claim 11 , wherein said transmitting includes transmitting the control information on one or a plurality of the CCEs with consecutive CCE number(s), wherein the index of the resource is associated with the first CCE number of the CCEs used for transmission of the control information.
15. The method according to claim 11 , further comprising at least one of:
dispreading the response signal; and
descrambling the response signal.
16. The method according to claim 11 , wherein the response signal is multiplied at the terminal by 1 or e j(π/2) depending on said one of the cyclic shift values.
17. The method according to claim 11 , wherein the response signal is multiplied at the terminal by 1 or e j(π/2) depending on the sequence defined by said one of the cyclic shift values.
18. The method according to claim 11 , wherein the response signal is spread at the terminal with one of orthogonal sequences, said one of the orthogonal sequences being determined from the index of the resource.
19. The method according to claim 18 , wherein the response signal is multiplied at the terminal by 1 when the resource is one of two resources, from which the same orthogonal sequence out of the orthogonal sequences is determined and from which two cyclic shift values that are next to each other at a set interval are determined, and by e j(π/2) when the resource is the other of the two resources.
20. The method according to claim 1 , wherein the response signal is an Acknowledgment (ACK) or Negative Acknowledgement (NACK) signal.