Radio transmission device and radio transmission method

• US 9,584,289 B2
• Filed: 05/26/2016
• Issued: 02/28/2017
• Est. Priority Date: 08/13/2007
• Status: Active Grant

• Current Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Original Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Inventors: Nakao, Seigo, Imamura, Daichi, Ogawa, Yoshihiko, Matsumoto, Atsushi, Hiramatsu, Katsuhiko
• Primary Examiner(s): Vu, Huy D
• Assistant Examiner(s): Shao, Hong
• Application Number:
  US15/165,950
• Publication Number:
  US 20160277171A1
• Time in Patent Office: 278 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04J 11/0023 Interference mitigation or co-ordination direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541
• CPC Class Codes: H04J 13/004 Orthogonal
• CPC Class Codes: H04J 13/0062 Zadoff-Chu
• CPC Class Codes: H04J 13/0074 Code shifting or hopping
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 27/00 Modulated-carrier systems
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

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.

Claims

1. A mobile station apparatus comprising:

a reference signal (RS) phase controller which,

(a) when the mobile station apparatus transmits a channel quality indicator (CQI) signal without a response signal, assigns the same phase to plural RSs mapped to Nth symbol and Mth symbol of a transmission format;

(b) when the mobile station apparatus transmits a CQI signal and a response signal in the same subframe and when the response signal is an acknowledgement (ACK) signal, assigns opposite phases to plural RSs mapped to the Nth symbol and the Mth symbol of the transmission format; and

(c) when the mobile station apparatus transmits a CQI signal and a response signal in the same subframe and when the response signal is a negative acknowledgement (NACK) signal, assigns the same phase to plural RSs mapped to the Nth symbol and the Mth symbol of the transmission format; and

a transmitter configured to transmit the CQI signal including the phase-assigned RSs;

wherein when the mobile station apparatus transmits a response signal without a CQI signal, there are more instances in which sequences mapped to the Nth symbol and the Mth symbol are in the same phase than in opposite phases.

5. The mobile station apparatus of claim 1, wherein the Nth symbol is a 2^nd symbol and the Mth symbol is a 6^th symbol.

9. The mobile station apparatus of claim 1, wherein the transmitter transmits the CQI signal including the phase-assigned RSs in the same subframe as an ACK/NACK signal transmitted from another mobile station.

13. The mobile station apparatus of claim 1, wherein in ACK/NACK signals transmitted from other mobile stations, there are more instances in which sequences mapped to the Nth symbol and the Mth symbol are in the same phase than in opposite phases.

17. The mobile station apparatus of claim 1, wherein the transmitter is configured to transmit the CQI signal including the phase-assigned RSs in a resource block supporting a mixture of a first format for transmitting a response signal without a CQI signal and a second format for transmitting a CQI signal with or without a response signal.

18. The mobile station apparatus of claim 17, wherein, in the resource block, the first format is associated with a sequence defined by a first cyclic shift value and the second format is associated with a sequence defined by a second cyclic shift value different from the first cyclic shift value.

2. A base station apparatus comprising:

a receiver configured to receive signals transmitted from a mobile station apparatus; and

a demodulator which,

(a) when the base station apparatus receives from the mobile station apparatus a channel quality indicator (CQI) signal without a response signal, demodulates the CQI signal using a propagation channel estimate based on an assumption that plural reference signals (RSs) mapped to Nth symbol and Mth symbol of a transmission format are in the same phase;

(b) when the base station apparatus receives from the mobile station apparatus a CQI signal and a response signal in the same subframe and when the plural RSs mapped to the Nth symbol and the Mth symbol of the transmission format are in opposite phases, determines that the response signal is an acknowledgement (ACK) signal, uses the phases of the plural RSs mapped to the Nth symbol and the Mth symbol of the transmission format to obtain a propagation channel estimate, and demodulates the CQI signal using the propagation channel estimate; and

(c) when the base station apparatus receives from the mobile station apparatus a CQI signal and a response signal in the same subframe and when the plural RSs mapped to the Nth symbol and the Mth symbol of the transmission format are in the same phase, determines that the response signal is a negative acknowledgement (NACK) signal, uses the phases of the plural RSs mapped to the Nth symbol and the Mth symbol of the transmission format to obtain a propagation channel estimate, and demodulates the CQI signal using the propagation channel estimate;

wherein when the base station apparatus receives from the mobile station apparatus a response signal without a CQI signal, there are more instances in which sequences mapped to the Nth symbol and the Mth symbol are in the same phase than in reverse phases.

6. The base station apparatus of claim 2, wherein the Nth symbol is a 2^nd symbol and the Mth symbol is a 6^th symbol.

10. The base station apparatus of claim 2, wherein the receiver receives the CQI signal and the plural RSs from the mobile station in the same subframe as an ACK/NACK signal received from another mobile station.

14. The base station apparatus of claim 2, wherein in ACK/NACK signals received from other mobile stations, there are more instances in which sequences mapped to the Nth symbol and the Mth symbol are in the same phase than in opposite phases.

19. The base station apparatus of claim 2, wherein the receiver is configured to receive the CQI signal including the phase-assigned RSs transmitted from the mobile station in a resource block supporting a mixture of a first format for transmitting a response signal without a CQI signal and a second format for transmitting a CQI signal with or without a response signal.

20. The base station apparatus of claim 19, wherein, in the resource block, the first format is associated with a sequence defined by a first cyclic shift value and the second format is associated with a sequence defined by a second cyclic shift value different from the first cyclic shift value.

3. An integrated circuit comprising:

a reference signal (RS) phase controller which,

(a) when transmitting a channel quality indicator (CQI) signal without a response signal, assigns the same phase to plural RSs mapped to Nth symbol and Mth symbol of a transmission format;

(b) when transmitting a CQI signal and a response signal in the same subframe and when the response signal is an acknowledgement (ACK) signal, assigns opposite phases to plural RSs mapped to the Nth symbol and the Mth symbol of the transmission format; and

(c) when transmitting a CQI signal and a response signal in the same subframe and when the response signal is a negative acknowledgement (NACK) signal, assigns the same phase to plural RSs mapped to the Nth symbol and the Mth symbol of the transmission format; and

a transmission controller configured to transmit the CQI signal including the phase-assigned RSs;

wherein, when transmitting a response signal without a CQI signal, there are more instances in which sequences mapped to the Nth symbol and the Mth symbol are in the same phase than in opposite phases.

7. The integrated circuit of claim 3, wherein the Nth symbol is a 2^nd symbol and the Mth symbol is a 6^th symbol.

11. The integrated circuit of claim 3, wherein the transmission controller transmits the CQI signal including the phase-assigned RSs in the same subframe as an ACK/NACK signal transmitted from another mobile station controlled by a different integrated circuit.

15. The integrated circuit of claim 3, wherein in ACK/NACK signals transmitted from other mobile stations controlled by other integrated circuits, there are more instances in which sequences mapped to the Nth symbol and the Mth symbol are in the same phase than in opposite phases.

21. The integrated circuit of claim 3, wherein the transmission controller is configured to transmit the CQI signal including the phase-assigned RSs in a resource block supporting a mixture of a first format for transmitting a response signal without a CQI signal and a second format for transmitting a CQI signal with or without a response signal.

22. The integrated circuit of claim 21, wherein, in the resource block, the first format is associated with a sequence defined by a first cyclic shift value and the second format is associated with a sequence defined by a second cyclic shift value different from the first cyclic shift value.

4. An integrated circuit comprising:

a reception controller configured to receive signals transmitted from a mobile station apparatus; and

a demodulator which,

(a) when receiving, from the mobile station apparatus, a channel quality indicator (CQI) signal without a response signal, demodulates the CQI signal using a propagation channel estimate based on an assumption that plural RSs mapped to Nth symbol and Mth symbol of a transmission format are in the same phase;

(b) when receiving, from the mobile station apparatus, a CQI signal and a response signal in the same subframe and when the plural reference signals (RSs) mapped to the Nth symbol and the Mth symbol of the transmission format are in opposite phases, determines that the response signal is an acknowledgement (ACK) signal, uses the phases of the plural RSs mapped to the Nth symbol and the Mth symbol of the transmission format to obtain a propagation channel estimate, and demodulates the CQI signal using the propagation channel estimate; and

(c) when receiving, from the mobile station apparatus, a CQI signal and a response signal in the same subframe and when the plural RSs mapped to the Nth symbol and the Mth symbol of the transmission format are in the same phase, determines that the response signal is a negative acknowledgement (NACK) signal, uses the phases of the plural RSs mapped to the Nth symbol and the Mth symbol of the transmission format to obtain a propagation channel estimate, and demodulates the CQI signal using the propagation channel estimate;

wherein, when receiving, from the mobile station apparatus, only a response signal and when there are more instances in which sequences mapped to the Nth symbol and the Mth symbol are in the same phase than in reverse phases.

8. The integrated circuit of claim 4, wherein the Nth symbol is a 2^nd symbol and the Mth symbol is a 6^th symbol.

12. The integrated circuit of claim 4, wherein the reception controller receives the CQI signal and the plural RSs from the mobile station in the same subframe as an ACK/NACK signal received from another mobile station.

16. The integrated circuit of claim 4, wherein in ACK/NACK signals received from other mobile stations, there are more instances in which sequences mapped to the Nth symbol and the Mth symbol are in the same phase than in opposite phases.

23. The integrated circuit of claim 4, wherein the reception controller is configured to receive the CQI signal including the phase-assigned RSs transmitted from the mobile station in a resource block supporting a mixture of a first format for transmitting a response signal without a CQI signal and a second format for transmitting a CQI signal with or without a response signal.

24. The integrated circuit of claim 23, wherein, in the resource block, the first format is associated with a sequence defined by a first cyclic shift value and the second format is associated with a sequence defined by a second cyclic shift value different from the first cyclic shift value.