Radio reception apparatus, radio transmission apparatus, and radio communication method

• US 9,491,742 B2
• Filed: 12/15/2015
• Issued: 11/08/2016
• Est. Priority Date: 03/16/2009
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Sun Patent Trust
• Inventors: Hoshino, Masayuki, Nishio, Akihiko, Nakao, Seigo, Imamura, Daichi
• Primary Examiner(s): Sheikh, Ayaz
• Assistant Examiner(s): VIDAL CARPIO, MARIELA
• Application Number:
  US14/969,943
• Publication Number:
  US 20160100392A1
• Time in Patent Office: 329 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0486 taking channel rank into account
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/1829 Arrangements specially adapted for the receiver end
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• 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 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/0082 at predetermined intervals
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource
• CPC Class Codes: H04W 72/1215 for collaboration of different radio technologies
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

Where first and second reference signals for a first and second communication system, respectively, are transmitted, resources that affect a reception apparatus compatible only with the first communication system can be minimized, and the throughput can be prevented from being deteriorated. As resources for a reference signal CSI-RS for LTE-A, last half symbols in a time direction of a resource unit RB/Sub-frame defined in a frequency-time domain are used, and the CSI-RS is allocated in a position up to the last two symbols or in the last symbol, or the like, of a particular RB/Sub-frame and transmitted when a reference signal 4RS for LTE is transmitted to a reception apparatus in addition to transmitting CSI-RS for LTE-A. The reception apparatus receives CSI-RS allocated in the last half symbol of RB/Sub-frame based on CSI-RS allocation information, measures channel quality by using this CSI-RS, and transmits and reports feedback information.

Claims

1. An integrated circuit to controlling a process, the process comprising:

receiving, in at least one mode of operation, a first reference signal for a first communication system, the first reference signal being mapped in a plurality of symbols of both a former half and a latter half, and the plurality of symbols being divided in the former half and the latter half according to a time direction, of which a subframe is comprised;

receiving, in the at least one mode of operation, a second reference signal for a second communication system, the second reference signal being mapped to only a last two symbols in the latter half of symbols; and

calculating channel quality information using at least the second reference signal,

wherein the first reference signal is a Long Term Evolution (LTE) reference signal and the second reference signal is an LTE-Advanced reference signal.

2. The integrated circuit according to claim 1, comprising:

circuitry which, in operation, controls the process;

at least one input coupled to the circuitry, wherein the at least one input, in operation, inputs data; and

at least one output coupled to the circuity, wherein the at least one output, in operation, outputs data.

3. The integrated circuit according to claim 2, wherein the second reference signal is mapped in a given subframe of a plurality of subframes, and the first reference signal is mapped in all of the plurality of subframes.

4. The integrated circuit according to claim 2, wherein the second reference signal is not received in a subframe where a transmission of the second reference signal collides with a transmission of PBCH or SIB 1.

5. The integrated circuit according to claim 2, wherein the process further comprises:

receiving information related to a mapping of the second reference signal.

6. The integrated circuit according to claim 5, wherein the information indicates a subframe where the second reference signal is mapped.

7. The integrated circuit according to claim 2, wherein the second reference signal is cell-specific.

8. The integrated circuit according to claim 2, wherein the second reference signal is used for calculating at least one of CQI, PMI and RI.

9. The integrated circuit according to claim 2, wherein the second reference signal is a CSI-RS.

10. The integrated circuit according to claim 2, wherein the process further comprises:

receiving data, that is mapped in a given symbol in a frequency direction and then mapped in a symbol, which is next to the given symbol in a time direction, in the frequency direction.

11. The integrated circuit according to claim 10, wherein said data is comprised of systematic bits first followed by parity bits.

12. The integrated circuit according to claim 2, wherein a number of antenna ports for the second communication system is greater than a number of antenna ports for the first communication system.

13. The integrated circuit according to claim 2, wherein the first communication system is a LTE and the second communication system is a LTE-Advanced.

14. The integrated circuit according to claim 2, wherein the at least one output and the at least one input, in operation, are coupled to an antenna.

15. An integrated circuit comprising circuitry, which, in operation:

controls, in at least one mode of operation, reception of a first reference signal for a first communication system, the first reference signal being mapped in a plurality of symbols of both a former half and a latter half, the plurality of symbols being divided in the former half and the latter half according to a time direction, of which a subframe is comprised;

controls, in the at least one mode of operation, reception of a second reference signal for a second communication system, the second reference signal being mapped to only a last two symbols in the latter half of symbols; and

controls calculation of channel quality information using at least the second reference signal,

wherein the first reference signal is a Long Term Evolution (LTE) reference signal and the second reference signal is an LTE-Advanced reference signal.

16. The integrated circuit according to claim 15, further comprising:

at least one input coupled to the circuitry, wherein the at least one input, in operation, inputs data; and

at least one output coupled to the circuity, wherein the at least one output, in operation, outputs data.

17. The integrated circuit according to claim 16, wherein the second reference signal is mapped in a given subframe of a plurality of subframes, and the first reference signal is mapped in all of the plurality of subframes.

18. The integrated circuit according to claim 16, wherein the second reference signal is not received in a subframe where a transmission of the second reference signal collides with a transmission of PBCH or SIB 1.

19. The integrated circuit according to claim 16, wherein the circuitry controls reception of information related to a mapping of the second reference signal.

20. The integrated circuit according to claim 19, wherein the information indicates a subframe where the second reference signal is mapped.

21. The integrated circuit according to claim 16, wherein the second reference signal is cell-specific.

22. The integrated circuit according to claim 16, wherein the second reference signal is used for calculating at least one of CQI, PMI and RI.

23. The integrated circuit according to claim 16, wherein the second reference signal is a CSI-RS.

24. The integrated circuit according to claim 16, wherein the circuitry controls reception of data, that is mapped in a given symbol in a frequency direction and then mapped in a symbol, which is next to the given symbol in a time direction, in the frequency direction.

25. The integrated circuit according to claim 24, wherein said data is comprised of systematic bits first followed by parity bits.

26. The integrated circuit according to claim 16, wherein a number of antenna ports for the second communication system is greater than a number of antenna ports for the first communication system.

27. The integrated circuit according to claim 16, wherein the first communication system is a LTE and the second communication system is a LTE-Advanced.

28. The integrated circuit according to claim 16, wherein the at least one output and the at least one input, in operation, are coupled to an antenna.