APERIODIC CHANNEL STATE INFORMATION REQUEST IN WIRELESS COMMUNICATION

• US 20120076017A1
• Filed: 03/25/2011
• Published: 03/29/2012
• Est. Priority Date: 04/05/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Luo, Xiliang, Zhang, Xiaoxia, Gaal, Peter, Xu, Hao, Chen, Wanshi, Montojo, Juan, Luo, Tao
• Granted Patent: US 8,638,684 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

Abstract

A method, computer program product, and apparatus are provided in which a request for a channel state information (CSI) report is received on a component carrier of a plurality of component carriers. The request indicates a set of component carriers of the plurality of component carriers for which to provide the CSI report. In addition, a CSI report including feedback for each of the indicated component carriers in the set of component carriers is transmitted. A method, computer program product, and apparatus are provided in which a request for a CSI report on a component carrier of a plurality of component carriers is transmitted. The request indicates a set of component carriers of the plurality of component carriers for which to receive the CSI report. In addition, a CSI report including feedback for each of the indicated component carriers in the set of component carriers is received.

Claims

1. A method of wireless communication, comprising:

receiving a request for a channel state information (CSI) report on a component carrier of a plurality of component carriers, the request indicating a set of component carriers of the plurality of component carriers for which to provide the CSI report; and

transmitting the CSI report including feedback for each of the indicated component carriers in the set of component carriers.

2. The method of claim 1, further comprising refraining from determining CSI for any of the plurality of component carriers when the request indicates that no CSI report is triggered, wherein the set of component carriers includes no component carriers.

3. The method of claim 1, further comprising determining CSI for the set of component carriers when the request indicates the CSI report is triggered, wherein the CSI report includes the determined CSI.

4. The method of claim 1, wherein the set of component carriers includes said component carrier only when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered.

5. The method of claim 1, wherein the set of component carriers includes a predetermined component carrier when the request includes two bits for indicating the set of component carriers and the two bits indicate that a CSI report is triggered for the predetermined component carrier.

6. The method of claim 1, wherein the set of component carriers includes the component carriers in a first set of component carriers or a second set of component carriers configured semi-statically through radio resource control (RRC) signaling when the request includes two bits for indicating the set of component carriers and the two bits indicate that a CSI report is triggered for the first set of component carriers or the second set of component carriers.

7. The method of claim 1, wherein the request includes five bits for indicating any subset of five component carriers for which to provide the feedback.

8. The method of claim 1, further comprising determining the set of component carriers for which to send feedback based on at least one of an uplink subframe number and a system frame number when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered.

9. The method of claim 1, further comprising:

receiving a cyclic shift for demodulation reference signals (DM-RS) from an uplink grant; and

determining the set of component carriers for which to send feedback based on the received cyclic shift when the report includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered.

10. The method of claim 9, wherein the set of component carriers for which to send feedback is further determined based on a received reserved modulation and coding scheme (MCS) index.

11. The method of claim 1, further comprising when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered, determining the set of component carriers for which to send feedback based on whether a physical downlink shared channel (PDSCH) is received on a component carrier in the same subframe as the received request.

12. The method of claim 1, further comprising when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered, determining the set of component carriers for which to send feedback based on a carrier indicator field (CIF) in a received physical downlink control channel (PDCCH) in the same subframe as the received request, wherein the received PDCCH includes a downlink grant for scheduling a physical downlink shared channel (PDSCH) and the CIF indicates a component carrier for which the received PDCCH applies.

13. The method of claim 1, further comprising when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered, determining the set of component carriers for which to send feedback based on a subset of bits of a resource allocation field.

14. The method of claim 1, further comprising when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered, determining the set of component carriers for which to send feedback based on information configured semi-statically through radio resource control (RRC) signaling.

15. A method of wireless communication, comprising:

transmitting a request for a channel state information (CSI) report on a component carrier of a plurality of component carriers, the request indicating a set of component carriers of the plurality of component carriers for which to receive the CSI report; and

receiving the CSI report including feedback for each of the indicated component carriers in the set of component carriers.

16. The method of claim 15, further comprising including in the request one bit only for indicating the set of component carriers when the set of component carriers includes only the component carrier.

17. The method of claim 15, further comprising including in the request two bits for indicating the set of component carriers when the set of component carriers includes no component carriers, includes a predetermined component carrier, or includes a first set of component carriers or a second set of component carriers as configured semi-statically through radio resource control (RRC) signaling.

18. The method of claim 17, further comprising configuring the first set of component carriers and the second set of component carriers semi-statically through radio resource control (RRC) signaling before transmitting the request with two bits for indicating that the CSI report is triggered for the first set of component carriers or the second set of component carriers.

19. An apparatus for wireless communication, comprising:

means for receiving a request for a channel state information (CSI) report on a component carrier of a plurality of component carriers, the request indicating a set of component carriers of the plurality of component carriers for which to provide the CSI report; and

means for transmitting the CSI report including feedback for each of the indicated component carriers in the set of component carriers.

20. The apparatus of claim 19, further comprising means for refraining from determining CSI for any of the plurality of component carriers when the request indicates that no CSI report is triggered, wherein the set of component carriers includes no component carriers.

21. The apparatus of claim 19, further comprising means for determining CSI for the set of component carriers when the request indicates the CSI report is triggered, wherein the CSI report includes the determined CSI.

22. The apparatus of claim 19, wherein the set of component carriers includes said component carrier only when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered.

23. The apparatus of claim 19, wherein the set of component carriers includes a predetermined component carrier when the request includes two bits for indicating the set of component carriers and the two bits indicate that a CSI report is triggered for the predetermined component carrier.

24. The apparatus of claim 19, wherein the set of component carriers includes the component carriers in a first set of component carriers or a second set of component carriers configured semi-statically through radio resource control (RRC) signaling when the request includes two bits for indicating the set of component carriers and the two bits indicate that a CSI report is triggered for the first set of component carriers or the second set of component carriers.

25. The apparatus of claim 19, wherein the request includes five bits for indicating any subset of five component carriers for which to provide the feedback.

26. The apparatus of claim 19, further comprising means for determining the set of component carriers for which to send feedback based on at least one of an uplink subframe number and a system frame number when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered.

27. The apparatus of claim 19, further comprising:

means for receiving a cyclic shift for demodulation reference signals (DM-RS) from an uplink grant; and

means for determining the set of component carriers for which to send feedback based on the received cyclic shift when the report includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered.

28. The apparatus of claim 27, wherein the set of component carriers for which to send feedback is further determined based on a received reserved modulation and coding scheme (MCS) index.

29. The apparatus of claim 19, further comprising when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered, means for determining the set of component carriers for which to send feedback based on whether a physical downlink shared channel (PDSCH) is received on a component carrier in the same subframe as the received request.

30. The apparatus of claim 19, further comprising when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered, means for determining the set of component carriers for which to send feedback based on a carrier indicator field (CIF) in a received physical downlink control channel (PDCCH) in the same subframe as the received request, wherein the received PDCCH includes a downlink grant for scheduling a physical downlink shared channel (PDSCH) and the CIF indicates a component carrier for which the received PDCCH applies.

31. The apparatus of claim 19, further comprising, when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered, means for determining the set of component carriers for which to send feedback based on a subset of bits of a resource allocation field.

32. The apparatus of claim 19, further comprising when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered, means for determining the set of component carriers for which to send feedback based on information configured semi-statically through radio resource control (RRC) signaling.

33. An apparatus for wireless communication, comprising:

means for transmitting a request for a channel state information (CSI) report on a component carrier of a plurality of component carriers, the request indicating a set of component carriers of the plurality of component carriers for which to receive the CSI report; and

means for receiving the CSI report including feedback for each of the indicated component carriers in the set of component carriers.

34. The apparatus of claim 33, further comprising means for including in the request one bit only for indicating the set of component carriers when the set of component carriers includes only the component carrier.

35. The apparatus of claim 33, further comprising means for including in the request two bits for indicating the set of component carriers when the set of component carriers includes no component carriers, includes a predetermined component carrier, or includes a first set of component carriers or a second set of component carriers as configured semi-statically through radio resource control (RRC) signaling.

36. The apparatus of claim 35, further comprising means for configuring the first set of component carriers and the second set of component carriers semi-statically through radio resource control (RRC) signaling before transmitting the request with two bits for indicating that the CSI report is triggered for the first set of component carriers or the second set of component carriers.

37. An apparatus for wireless communication, comprising:

at least one processor configured to;

receive a request for a channel state information (CSI) report on a component carrier of a plurality of component carriers, the request indicating a set of component carriers of the plurality of component carriers for which to provide the CSI report; and

transmit the CSI report including feedback for each of the indicated component carriers in the set of component carriers; and

memory coupled to the at least one processor.

38. The apparatus of claim 37, wherein the at least one processor is further configured to refrain from determining CSI for any of the plurality of component carriers when the request indicates that no CSI report is triggered, wherein the set of component carriers includes no component carriers.

39. The apparatus of claim 37, wherein the at least one processor is further configured to determine CSI for the set of component carriers when the request indicates the CSI report is triggered, wherein the CSI report includes the determined CSI.

40. The apparatus of claim 37, wherein the set of component carriers includes said component carrier only when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered.

41. The apparatus of claim 37, wherein the set of component carriers includes a predetermined component carrier when the request includes two bits for indicating the set of component carriers and the two bits indicate that a CSI report is triggered for the predetermined component carrier.

42. The apparatus of claim 37, wherein the set of component carriers includes the component carriers in a first set of component carriers or a second set of component carriers configured semi-statically through radio resource control (RRC) signaling when the request includes two bits for indicating the set of component carriers and the two bits indicate that a CSI report is triggered for the first set of component carriers or the second set of component carriers.

43. The apparatus of claim 37, wherein the request includes five bits for indicating any subset of five component carriers for which to provide the feedback.

44. The apparatus of claim 37, wherein the at least one processor is further configured to determine the set of component carriers for which to send feedback based on at least one of an uplink subframe number and a system frame number when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered.

45. The apparatus of claim 37, wherein the at least one processor is further configured to:

receive a cyclic shift for demodulation reference signals (DM-RS) from an uplink grant; and

determine the set of component carriers for which to send feedback based on the received cyclic shift when the report includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered.

46. The apparatus of claim 45, wherein the set of component carriers for which to send feedback is further determined based on a received reserved modulation and coding scheme (MCS) index.

47. The apparatus of claim 37, wherein when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered, the at least one processor is further configured to determine the set of component carriers for which to send feedback based on whether a physical downlink shared channel (PDSCH) is received on a component carrier in the same subframe as the received request.

48. The apparatus of claim 37, wherein when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered, the at least one processor is further configured to determine the set of component carriers for which to send feedback based on a carrier indicator field (CIF) in a received physical downlink control channel (PDCCH) in the same subframe as the received request, wherein the received PDCCH includes a downlink grant for scheduling a physical downlink shared channel (PDSCH) and the CIF indicates a component carrier for which the received PDCCH applies.

49. The apparatus of claim 37, wherein when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered, the at least one processor is further configured to determine the set of component carriers for which to send feedback based on a subset of bits of a resource allocation field.

50. The apparatus of claim 37, wherein when the request includes one bit only for indicating the set of component carriers and the one bit indicates that the CSI report is triggered, the at least one processor is further configured to determine the set of component carriers for which to send feedback based on information configured semi-statically through radio resource control (RRC) signaling.

51. An apparatus for wireless communication, comprising:

at least one processor configured to;

transmit a request for a channel state information (CSI) report on a component carrier of a plurality of component carriers, the request indicating a set of component carriers of the plurality of component carriers for which to receive the CSI report; and

receive the CSI report including feedback for each of the indicated component carriers in the set of component carriers; and

memory coupled to the at least one processor.

52. The apparatus of claim 51, wherein the at least one processor is further configured to include in the request one bit only for indicating the set of component carriers when the set of component carriers includes only the component carrier.

53. The apparatus of claim 51, wherein the at least one processor is further configured to include in the request two bits for indicating the set of component carriers when the set of component carriers includes no component carriers, includes a predetermined component carrier, or includes a first set of component carriers or a second set of component carriers as configured semi-statically through radio resource control (RRC) signaling.

54. The apparatus of claim 53, wherein the at least one processor is further configured to configure the first set of component carriers and the second set of component carriers semi-statically through radio resource control (RRC) signaling before transmitting the request with two bits for indicating that the CSI report is triggered for the first set of component carriers or the second set of component carriers.

55. A computer program product, comprising:

a computer-readable medium including instructions stored thereon for causing a computer to;

receive a request for a channel state information (C SI) report on a component carrier of a plurality of component carriers, the request indicating a set of component carriers of the plurality of component carriers for which to provide the CSI report; and

transmit the CSI report including feedback for each of the indicated component carriers in the set of component carriers.

56. A computer program product, comprising:

a computer-readable medium including instructions stored thereon for causing a computer to;

transmit a request for a channel state information (C SI) report on a component carrier of a plurality of component carriers, the request indicating a set of component carriers of the plurality of component carriers for which to receive the CSI report; and

receive the CSI report including feedback for each of the indicated component carriers in the set of component carriers.