Abstract
A wireless communication terminal apparatus wherein CoMP communication can normally be performed without increasing the overhead of an upstream line control channel. In this apparatus a spreading unit primarily spreads a response signal by use of a ZAC sequence established by a control unit. A spreading unit secondarily spreads the response signal to which CP has been added by use of a block-wise spread code sequence established by the control unit. The control unit controls in accordance with sequence numbers and a hopping pattern established therein the circular shift amount of the ZAC sequence to be used for the primary spread in the spreading unit and the block-wise spread code sequence to be used for the secondary spread in the spreading unit. The hopping pattern established in the control unit is a hopping pattern common to a plurality of base stations that CoMP-receive the response signal.
Technology
Resource configuration
Product
Use Cases
Wireless communication
Services
Claim
1. A communication apparatus comprising: a transmitter, which, in operation, transmits, to a terminal, a first identity specific to a cell, and transmits, to the terminal, a second identity, which is different from the first identity and which is set independently of the first identity; and a receiver, which, in operation, receives a response signal, which is (i) first-spread using a first sequence defined by one of a plurality of cyclic shifts, said one of the plurality of cyclic shifts varying between symbols according to a cyclic shift hopping pattern set based on the second identity, and (ii) second-spread using one of a plurality of second sequences that are orthogonal to each other, and which is transmitted from the terminal. 2. The communication apparatus according to claim 1, wherein the cyclic shift hopping pattern is common between a plurality of cells communicating with the terminal. 3. The communication apparatus according to claim 1, wherein, using a difference between slot numbers in a plurality of cells communicating with the terminal, the cyclic shift hopping pattern is adjusted. 4. The communication apparatus according to claim 1, wherein, the cyclic shift hopping pattern is adjusted using a difference between a slot number in a cell, to which the terminal belongs, and a slot number in a specific cell among a plurality of cells communicating with the terminal. 5. The communication apparatus according to claim 1, wherein the second identity is common between a plurality of cells communicating with the terminal. 6. The communication apparatus according to claim 1, wherein the cyclic shift hopping pattern is set based on one of the first identity and the second identity according to a signaling from a cell communicating with the terminal. 7. The communication apparatus according to claim 1, wherein a number of bits in the first identity is same as that in the second identity. 8. The communication apparatus according to claim 1, wherein the second identity is not related to a parameter of a downlink. 9. The communication apparatus according to claim 1, wherein the second identity is related to a resource used for transmission of the response signal. 10. A communication method comprising: transmitting, to a terminal, a first identity specific to a cell, and transmits, to the terminal, a second identity, which is different from the first identity and which is set independently of the first identity; and receiving a response signal, which is (i) first-spread using a first sequence defined by one of a plurality of cyclic shifts, said one of the plurality of cyclic shifts varying between symbols according to a cyclic shift hopping pattern set based on the second identity, and (ii) second-spread using one of a plurality of second sequences that are orthogonal to each other, and which is transmitted from the terminal. 11. The communication method according to claim 10, wherein the cyclic shift hopping pattern is common between a plurality of cells communicating with the terminal. 12. The communication method according to claim 10, wherein, using a difference between slot numbers in a plurality of cells communicating with the terminal, the cyclic shift hopping pattern is adjusted. 13. The communication method according to claim 10, wherein, the cyclic shift hopping pattern is adjusted using a difference between a slot number in a cell, to which the terminal belongs, and a slot number in a specific cell among a plurality of cells communicating with the terminal. 14. The communication method according to claim 10, wherein the second identity is common between a plurality of cells communicating with the terminal. 15. The communication method according to claim 10, wherein the cyclic shift hopping pattern is set based on one of the first identity and the second identity according to a signaling from a cell communicating with the terminal. 16. The communication method according to claim 10, wherein a number of bits in the first identity is same as that in the second identity. 17. The communication method according to claim 10, wherein the second identity is not related to a parameter of a downlink. 18. The communication method according to claim 10, wherein the second identity is related to a resource used for transmission of the response signal.
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