PERIODIC CQI REPORTING IN A WIRELESS COMMUNICATION NETWORK

• US 20110249584A1
• Filed: 04/12/2011
• Published: 10/13/2011
• Est. Priority Date: 04/13/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Xu, Hao, Ji, Tingfang, Barbieri, Alan
• Granted Patent: US 9,219,571 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• 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: H04L 5/0085 when channel conditions change
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

According to certain aspects, techniques for aperiodically reporting channel state information (CSI) on protected and unprotected resources are provided. The protected resources may include resources in which transmissions in a first cell are protected by restricting transmissions in a second cell. According to certain aspects, a request for channel quality indicator (CQI) may be sent in a first subframe, CQI may be measured for a second subframe having a first offset from the first subframe, and a corresponding CQI report sent in a third subframe having a second offset from the first subframe.

Claims

1. A method for wireless communication, comprising:

receiving a request for channel quality indicator (CQI) in a first subframe;

determining a first CQI for a second subframe having a first offset from the first subframe; and

sending a report comprising the first CQI in a third subframe having a second offset from the first subframe.

2. The method of claim 1, further comprising:

receiving the first offset via upper layer signaling or with the request for CQI.

3. The method of claim 1, further comprising:

determining the first offset by cycling through a range of possible offsets and selecting a different offset for each request for CQI.

4. The method of claim 1, further comprising:

receiving the second offset via upper layer signaling or with the request.

5. The method of claim 1, wherein the second offset is one of a plurality of possible offsets corresponding to different subframes of one interlace.

6. The method of claim 1, further comprising:

determining a second CQI for at least one additional subframe prior to the third subframe; and

generating the report comprising the first and second CQIs.

7. The method of claim 1, wherein the second subframe is allocated to a base station and has reduced or no interference from at least one interfering base station.

8. The method of claim 6, wherein the second subframe is allocated to a base station and has reduced or no interference from at least one interfering base station, and wherein the at least one additional subframe is not allocated to the base station.

9. The method of claim 1, further comprising:

determining a rank indicator (RI) for the second subframe; and

generating the report comprising the first CQI and the RI.

10. The method of claim 1, further comprising:

determining a precoding matrix indicator (PMI) for the second subframe, and wherein the report further comprises the PMI.

11. The method of claim 1, further comprising:

determining a first rank indicator (RI) for the second subframe;

generating the report comprising the first and second CQIs and the first RI.

12. The method of claim 11, further comprising:

determining a second RI for the at least one additional subframe, and wherein the report further comprises the second RI.

13. The method of claim 6, further comprising:

receiving an indication to report a single CQI for a single subframe or a plurality of CQIs for a plurality of subframes, and wherein the second CQI is determined if the indication indicates to report a plurality of CQIs.

14. The method of claim 13, wherein the indication is received via upper layer signaling or with the request for CQI.

15. The method of claim 1, further comprising:

receiving data transmission sent based on the first CQI.

16. The method of claim 1, further comprising:

receiving a downlink grant and the request for CQI in the first subframe;

receiving data transmission in the first subframe; and

sending acknowledgement (ACK) or negative acknowledgement (NACK) for the data transmission in a fourth subframe prior to the third subframe.

17. The method of claim 1, further comprising:

receiving a downlink grant and the request for CQI in the first subframe;

receiving data transmission in the first subframe; and

sending acknowledgement (ACK) or negative acknowledgement (NACK) for the data transmission and the report in the third subframe.

18. The method of claim 1, further comprising:

receiving an uplink grant and the request for CQI in the first subframe; and

sending data transmission in a fourth subframe having a fixed offset from the first subframe and prior to the third subframe.

19. The method of claim 1, further comprising:

receiving an uplink grant and the request for CQI in the first subframe; and

sending data transmission and the report in the third subframe.

20. A method for wireless communication, comprising:

sending a request for channel quality indicator (CQI) in a first subframe; and

receiving a report comprising a first CQI determined for a second subframe having a first offset from the first subframe, the report being received in a third subframe having a second offset from the first subframe.

21. The method of claim 20, further comprising:

sending the first offset via upper layer signaling or with the request for CQI.

22. The method of claim 21, wherein the first offset is determined by cycling through a range of possible offsets and selecting a different offset for each request for CQI.

23. The method of claim 20, further comprising:

sending the second offset via upper layer signaling or with the request.

24. The method of claim 20, wherein the second offset is one of a plurality of possible offsets corresponding to different subframes of one interlace.

25. The method of claim 20, further comprising:

obtaining from the report a second CQI determined for at least one additional subframe prior to the third subframe.

26. The method of claim 25, wherein the second subframe is allocated to a base station and has reduced or no interference from at least one interfering base station.

27. The method of claim 25, wherein the second subframe is allocated to a base station and has reduced or no interference from at least one interfering base station, and wherein the at least one additional subframe is not allocated to the base station.

28. The method of claim 25, further comprising:

obtaining from the report a rank indicator (RI) determined for the second subframe.

29. The method of claim 28, further comprising:

obtaining from the report a precoding matrix indicator (PMI) determined for the second subframe.

30. The method of claim 25, further comprising:

obtaining from the report a first rank indicator (RI) determined for the second subframe.

31. The method of claim 30, further comprising:

obtaining from the report a second RI determined for the at least one additional subframe.

32. The method of claim 25, further comprising:

sending an indication to report a single CQI for a single subframe or a plurality of CQIs for a plurality of subframes, and wherein the second CQI is obtained if the indication indicates to report a plurality of CQIs.

33. The method of claim 20, wherein the indication is sent via upper layer signaling or with the request for CQI.

34. The method of claim 20, further comprising:

sending data transmission based on the first CQI.

35. The method of claim 20, further comprising:

sending a downlink grant and the request for CQI in the first subframe;

sending data transmission in the first subframe; and

receiving acknowledgement (ACK) or negative acknowledgement (NACK) for the data transmission in a fourth subframe prior to the third subframe.

36. The method of claim 20, further comprising:

sending a downlink grant and the request for CQI in the first subframe;

sending data transmission in the first subframe; and

receiving acknowledgement (ACK) or negative acknowledgement (NACK) for the data transmission and the report in the third subframe.

37. The method of claim 20, further comprising:

sending an uplink grant and the request for CQI in the first subframe; and

receiving data transmission in a fourth subframe having a fixed offset from the first subframe and prior to the third subframe.

38. The method of claim 20, further comprising:

sending an uplink grant and the request for CQI in the first subframe; and

receiving data transmission and the report in the third subframe.

39. An apparatus for wireless communication, comprising:

receiving a request for channel quality indicator (CQI) in a first subframe;

means for determining a first CQI for a second subframe having a first offset from the first subframe; and

means for sending a report comprising the first CQI in a third subframe having a second offset from the first subframe.

40. The apparatus of claim 39, further comprising:

means for receiving the first offset via upper layer signaling or with the request for CQI.

41. The apparatus of claim 39, further comprising:

means for determining the first offset by cycling through a range of possible offsets and selecting a different offset for each request for CQI.

42. The apparatus of claim 39, further comprising:

means for receiving the second offset via upper layer signaling or with the request.

43. The apparatus of claim 39, wherein the second offset is one of a plurality of possible offsets corresponding to different subframes of one interlace.

44. The apparatus of claim 39, further comprising:

means for determining a second CQI for at least one additional subframe prior to the third subframe; and

means for generating the report comprising the first and second CQIs.

45. The apparatus of claim 39, wherein the second subframe is allocated to a base station and has reduced or no interference from at least one interfering base station.

46. The apparatus of claim 45, wherein the second subframe is allocated to a base station and has reduced or no interference from at least one interfering base station, and wherein the at least one additional subframe is not allocated to the base station.

47. The apparatus of claim 39, further comprising:

means for determining a rank indicator (RI) for the second subframe; and

means for generating the report comprising the first CQI and the RI.

48. The apparatus of claim 47, further comprising:

means for determining a precoding matrix indicator (PMI) for the second subframe, and wherein the report further comprises the PMI.

49. An apparatus for wireless communication, comprising:

means for sending a request for channel quality indicator (CQI) in a first subframe; and

means for receiving a report comprising a first CQI determined for a second subframe having a first offset from the first subframe, the report being received in a third subframe having a second offset from the first subframe.

50. The apparatus of claim 49, further comprising:

means for sending the first offset via upper layer signaling or with the request for CQI.

51. The apparatus of claim 50, wherein the first offset is determined by cycling through a range of possible offsets and selecting a different offset for each request for CQI.

52. The apparatus of claim 49, further comprising:

means for sending the second offset via upper layer signaling or with the request.

53. The apparatus of claim 49, wherein the second offset is one of a plurality of possible offsets corresponding to different subframes of one interlace.

54. The apparatus of claim 49, further comprising:

means for obtaining from the report a second CQI determined for at least one additional subframe prior to the third subframe.

55. The apparatus of claim 54, wherein the second subframe is allocated to a base station and has reduced or no interference from at least one interfering base station.

56. The apparatus of claim 54, wherein the second subframe is allocated to a base station and has reduced or no interference from at least one interfering base station, and wherein the at least one additional subframe is not allocated to the base station.

57. The apparatus of claim 54, further comprising:

means for obtaining from the report a rank indicator (RI) determined for the second subframe.

58. The apparatus of claim 57, further comprising:

means for obtaining from the report a precoding matrix indicator (PMI) determined for the second subframe.

59. An apparatus for wireless communication, comprising:

at least one processor configured to receive a request for channel quality indicator (CQI) in a first subframe, determine a first CQI for a second subframe having a first offset from the first subframe, and sending a report comprising the first CQI in a third subframe having a second offset from the first subframe; and

a memory coupled with the at least one processor.

60. An apparatus for wireless communication, comprising:

at least one processor configured to send a request for channel quality indicator (CQI) in a first subframe and receive a report comprising a first CQI determined for a second subframe having a first offset from the first subframe, the report being received in a third subframe having a second offset from the first subframe; and

a memory coupled with the at least one processor.

61. A computer program product comprising a computer readable medium with instructions stored thereon, the instructions executable by one or more processors for:

receiving a request for channel quality indicator (CQI) in a first subframe;

determining a first CQI for a second subframe having a first offset from the first subframe; and

sending a report comprising the first CQI in a third subframe having a second offset from the first subframe.

62. A computer program product comprising a computer readable medium with instructions stored thereon, the instructions executable by one or more processors for:

sending a request for channel quality indicator (CQI) in a first subframe; and

receiving a report comprising a first CQI determined for a second subframe having a first offset from the first subframe, the report being received in a third subframe having a second offset from the first subframe.