Abstract
The present disclosure provides a terminal device that allows constraints on user allocation to be prevented and spread codes to be allocated in a scheduler when non-adaptive HARQ is employed using a PHICH. A codeword generator generates code words by encoding data, a layer mapping unit places each CW in one or a plurality of layers, a DMRS generator generates a reference signal for each layer in which a CW is placed by using any resource among a plurality of resources defined by a mutually orthogonal plurality of OCCs, and an ACK/NACK demodulator receives a response signal indicating a retransmission request. When a response signal requesting retransmission of only a CW placed in a plurality of layers is received, the DMRS generator uses each resource having the same OCC among the plurality of resources for the reference signals generated in the corresponding layers.
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Technologies
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Use Cases
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Claim
1. A communication apparatus comprising:
reception circuitry, which, in operation, controls a first reception of a first codeword with a first demodulation reference signal using a first orthogonal sequence and with a second demodulation reference signal using a second orthogonal sequence, wherein the first demodulation reference signal and the second demodulation reference signal are associated with different layers; and transmission circuitry, which, in operation, controls a transmission of ACK/NACK information; wherein the reception circuitry, responsive to the ACK/NACK information requesting retransmission of the first codeword, controls a second reception of the requested retransmission of the first codeword with a third demodulation reference signal using a third orthogonal sequence and with a fourth demodulation reference signal using a fourth orthogonal sequence, wherein the third orthogonal sequence and the fourth orthogonal sequence are associated with different layers; wherein the third orthogonal sequence is the same as the fourth orthogonal sequence regardless of whether the first orthogonal sequence is the same as or is different from the second orthogonal sequence in the first reception.
2. The communication apparatus according to claim 1, wherein the first orthogonal sequence is different from the second orthogonal sequence.
3. The communication apparatus according to claim 1, wherein the third orthogonal sequence and the forth orthogonal sequence are the same as the first orthogonal sequence or the second orthogonal sequence.
4. The communication apparatus according to claim 1, wherein the first demodulation reference signal is generated using a first cyclic shift value and the second demodulation reference signal is generated using a second cyclic shift value different from the first cyclic shift value.
5. The communication apparatus according to claim 4, wherein the third demodulation reference signal is generated using a third cyclic shift value and the forth demodulation reference signal is generated using a forth cyclic shift value different from the third cyclic shift value, wherein the third cyclic shift value is the same as the first cyclic shift value or the second cyclic shift value.
6. The communication apparatus according to claim 1, wherein the reception circuitry, in operation, controls the first reception of the first codeword with a second codeword in three layers.
7. The communication apparatus according to claim 6, wherein the reception circuitry, in operation, controls the first reception of the second codeword with a fifth demodulation reference signal using a fifth orthogonal sequence, wherein the fifth orthogonal sequence is the same as the first orthogonal sequence or the second orthogonal sequence.
8. The communication apparatus according to claim 7, wherein the third orthogonal sequence and the forth orthogonal sequence are the same as the fifth orthogonal sequence.
9. The communication apparatus according to claim 7, wherein the third demodulation reference signal is generated using a third cyclic shift value, the forth demodulation reference signal is generated using a forth cyclic shift value different from the third cyclic shift value, and the fifth demodulation reference signal is generated using a fifth cyclic shift value, wherein one of the third cyclic shift value and the forth cyclic shift value is the same as the fifth cyclic shift value.
10. The communication apparatus according to claim 1, wherein the ACK/NACK information requests the retransmission of the first codeword and not of a second codeword.
11. The communication apparatus according to claim 1, wherein a number of layers used to retransmit the first codeword does not exceed a number of layers used in the first reception of the first codeword.
12. The communication apparatus according to claim 1, wherein the ACK/NACK information is transmitted on a HARQ reporting channel (PHICH: Physical Hybrid-ARQ Indicator CHannel).
13. A communication method comprising:
receiving a first codeword with a first demodulation reference signal using a first orthogonal sequence and with a second demodulation reference signal using a second orthogonal sequence, wherein the first demodulation reference signal and the second demodulation reference signal are associated with different layers; transmitting ACK/NACK information; and responsive to the ACK/NACK information requesting retransmission of the first codeword, receiving a retransmission of the first codeword with a third demodulation reference signal using a third orthogonal sequence and with a fourth demodulation reference signal using a fourth orthogonal sequence, wherein the third orthogonal sequence and the fourth orthogonal sequence are associated with different layers; wherein the third orthogonal sequence is the same as the fourth orthogonal sequence regardless of whether the first orthogonal sequence is the same as or is different from the second orthogonal sequence.
14. The communication method according to claim 13, wherein the first orthogonal sequence is different from the second orthogonal sequence.
15. The communication method according to claim 13, wherein the third orthogonal sequence and the forth orthogonal sequence are the same as the first orthogonal sequence or the second orthogonal sequence.
16. The communication method according to claim 13, wherein the first demodulation reference signal is generated using a first cyclic shift value and the second demodulation reference signal is generated using a second cyclic shift value different from the first cyclic shift value.
17. The communication method according to claim 16, wherein the third demodulation reference signal is generated using a third cyclic shift value and the forth demodulation reference signal is generated using a forth cyclic shift value different from the third cyclic shift value, wherein the third cyclic shift value is the same as the first cyclic shift value or the second cyclic shift value.
18. The communication method according to claim 13, comprising:
receiving the first codeword with a second codeword in three layers.
19. The communication method according to claim 13, wherein the ACK/NACK information requests the retransmission of the first codeword and not of a second codeword.
20. The communication method according to claim 13, wherein the ACK/NACK information is transmitted on a HARQ reporting channel (PHICH: Physical Hybrid-ARQ Indicator CHannel).
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.