SPATIAL INTERFERENCE MITIGATION SCHEMES FOR WIRELESS COMMUNICATION

• US 20090286482A1
• Filed: 05/11/2009
• Published: 11/19/2009
• Est. Priority Date: 05/15/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Palanki, Ravi, Gorokhov, Alexei Y.
• Granted Patent: US 8,447,236 B2
• Time in Patent Office: Days
• US Class Current: 455/63.100
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 2025/03802 Signalling on the reverse channel
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

Techniques for transmitting and receiving data with spatial interference mitigation in a wireless communication network are described. In one design, a cell may receive preceding information from a first user equipment (UE) communicating with the cell and spatial feedback information (SFI) from a second UE not communicating with the cell. The cell may select a preceding matrix based on the preceding information and the SFI. The preceding matrix may steer a transmission toward the first UE and away from the second UE. The cell may send a reference signal based on the preceding matrix, send a resource quality information (RQI) request to the first UE, receive RQI determined by the first UE based on the reference signal, and determine a modulation and coding scheme (MCS) based on the RQI. The cell may then send a data transmission to the first UE with the preceding matrix and in accordance with the MCS.

Claims

1. A method of transmitting data in a wireless communication network, comprising:

receiving preceding information sent by a first user equipment (UE) to a cell;

receiving spatial feedback information (SFI) sent by a second UE to the cell, the second UE not communicating with the cell; and

sending a data transmission by the cell using at least one of the preceding information from the first UE and the SFI from the second UE.

2. The method of claim 1, wherein the SFI is sent by the second UE to the cell in response to an SFI request sent by a second cell to the second UE.

3. The method of claim 1, further comprising:

sending an SFI request to the first UE to ask the first UE to send SFI to a second cell.

4. The method of claim 1, wherein the SFI from the second UE comprises at least one of spatial nulling information for the cell, preceding information for a serving cell of the second UE, nulling gain information, resources on which to reduce interference by the cell, a target interference level for the second UE, and priority of interference reduction by the cell.

5. The method of claim 1, further comprising:

receiving SFI sent by a third UE to the cell, wherein the second and third UEs communicate with different cells other than the cell, and

wherein the data transmission is sent by the cell using at least one of the preceding information from the first UE, the SFI from the second UE, and the SFI from the third UE.

6. The method of claim 1, further comprising:

determining whether to schedule the first UE based on the preceding information from the first UE and the SFI from the second UE.

7. The method of claim 1, further comprising:

selecting a preceding matrix based on the preceding information from the first UE and the SFI from the second UE; and

sending a reference signal based on the preceding matrix.

8. The method of claim 7, further comprising:

determining a transmit power level for the reference signal based on the SFI from the second UE, and wherein the reference signal is sent at the determined transmit power level.

9. The method of claim 7, further comprising:

sending a resource quality information (RQI) request to the first UE; and

receiving RQI determined by the first UE based on the reference signal.

10. The method of claim 9, wherein the RQI request comprises at least one of resources on which to determine the RQI, resources to use to send the RQI, and priority of the RQI request.

11. The method of claim 9, wherein the sending the data transmission comprises

determining a modulation and coding scheme (MCS) based on the RQI from the first UE, and

sending the data transmission in accordance with the MCS to the first UE.

12. The method of claim 1, further comprising:

sending a reference signal based on the SFI from the second UE;

sending a resource quality information (RQI) request to a third UE; and

receiving RQI determined by the third UE based on the reference signal.

13. The method of claim 12, wherein the sending the reference signal comprises sending the reference signal based further on preceding information from the third UE.

14. The method of claim 12, wherein the sending the data transmission comprises

determining a modulation and coding scheme (MCS) based on the RQI from the third UE, and

sending the data transmission in accordance with the MCS to the third UE.

15. The method of claim 1, further comprising:

sending resource quality information (RQI) requests to multiple UEs;

receiving RQI from each of the multiple UEs; and

scheduling at least one of the multiple UEs for data transmission.

16. An apparatus for wireless communication, comprising:

means for receiving preceding information sent by a first user equipment (UE) to a cell;

means for receiving spatial feedback information (SFI) sent by a second UE to the cell, the second UE not communicating with the cell; and

means for sending a data transmission by the cell using at least one of the preceding information from the first UE and the SFI from the second UE.

17. The apparatus of claim 16, further comprising:

means for sending an SFI request to the first UE to ask the first UE to send SFI to a second cell.

18. The apparatus of claim 16, further comprising:

means for selecting a preceding matrix based on the preceding information from the first UE and the SFI from the second UE; and

means for sending a reference signal based on the preceding matrix.

19. The apparatus of claim 18, further comprising:

means for sending a resource quality information (RQI) request to the first UE; and

means for receiving RQI determined by the first UE based on the reference signal.

20. The apparatus of claim 16, further comprising:

means for sending a reference signal based on the SFI from the second UE;

means for sending a resource quality information (RQI) request to a third UE; and

means for receiving RQI determined by the third UE based on the reference signal.

21. An apparatus for wireless communication, comprising:

at least one processor configured to receive preceding information sent by a first user equipment (UE) to a cell, to receive spatial feedback information (SFI) sent by a second UE to the cell, the second UE not communicating with the cell, and to send a data transmission by the cell using at least one of the preceding information from the first UE and the SFI from the second UE.

22. The apparatus of claim 21, wherein the at least one processor is configured to send an SFI request to the first UE to ask the first UE to send SFI to a second cell.

23. The apparatus of claim 21, wherein the at least one processor is configured to select a preceding matrix based on the preceding information from the first UE and the SFI from the second UE, and to send a reference signal based on the preceding matrix.

24. The apparatus of claim 23, wherein the at least one processor is configured to send a resource quality information (RQI) request to the first UE, and to receive RQI determined by the first UE based on the reference signal.

25. The apparatus of claim 21, wherein the at least one processor is configured to send a reference signal based on the SFI from the second UE, to send a resource quality information (RQI) request to a third UE, and to receive RQI determined by the third UE based on the reference signal.

26. A computer program product, comprising:

a computer-readable medium comprising;

code for causing at least one computer to receive preceding information sent by a first user equipment (UE) to a cell,

code for causing the at least one computer to receive spatial feedback information (SFI) sent by a second UE to the cell, the second UE not communicating with the cell, and

code for causing the at least one computer to send a data transmission by the cell using at least one of the preceding information from the first UE and the SFI from the second UE.

27. A method of receiving data in a wireless communication network, comprising:

communicating by a user equipment (UE) with a first cell; and

sending spatial feedback information (SFI) for a second cell by the UE, the UE not communicating with the second cell.

28. The method of claim 27, wherein the communicating by the UE comprises

sending preceding information by the UE to the first cell, and

receiving a data transmission sent by the first cell to the UE based on the preceding information.

29. The method of claim 27, wherein the sending the SFI for the second cell comprises sending the SFI for the second cell by the UE to the second cell.

30. The method of claim 27, wherein the sending the SFI for the second cell comprises sending the SFI for the second cell by the UE to the first cell, the first cell forwarding the SFI to the second cell via backhaul.

31. The method of claim 27, further comprising:

receiving an SFI request sent by the first cell to the UE, and wherein the SFI is sent by the UE to the second cell in response to the SFI request.

32. The method of claim 31, wherein the SFI request comprises at least one of a list of at least one cell to send SFI, resources on which to determine the SFI, resources to use to send the SFI, priority of the SFI request, and a target interference level for the UE.

33. The method of claim 27, wherein the SFI comprises a channel direction indicator (CDI) or a preceding matrix indicator (PMI) for the second cell.

34. The method of claim 28, further comprising:

receiving a first reference signal sent by the first cell with a first preceding matrix determined based on the preceding information from the UE; and

determining resource quality information (RQI) based on the first reference signal.

35. The method of claim 34, further comprising:

receiving a second reference signal sent by the second cell with a second preceding matrix determined based on the SFI from the UE, and wherein the RQI is determined based further on the second reference signal.

36. The method of claim 34, further comprising:

receiving an RQI request from the first cell; and

sending the RQI to the first cell in response to the RQI request.

37. The method of claim 34, wherein the receiving the data transmission comprises receiving the data transmission sent by the first cell with the first preceding matrix and further in accordance with a modulation and coding scheme determined based on the RQI.

38. The method of claim 27, further comprising:

receiving a transmission sent by the second cell based on the SFI to reduce interference to the UE.

39. An apparatus for wireless communication, comprising:

means for communicating by a user equipment (UE) with a first cell; and

means for sending spatial feedback information (SFI) for a second cell by the UE, the UE not communicating with the second cell.

40. The apparatus of claim 39, wherein the means for communicating by the UE comprises

means for sending preceding information by the UE to the first cell, and

means for receiving a data transmission sent by the first cell to the UE based on the preceding information.

41. The apparatus of claim 39, further comprising:

means for receiving an SFI request sent by the first cell to the UE, and wherein the SFI is sent by the UE to the second cell in response to the SFI request.

42. The apparatus of claim 40, further comprising:

means for receiving a first reference signal sent by the first cell with a first preceding matrix determined based on the preceding information from the UE;

means for receiving a second reference signal sent by the second cell with a second preceding matrix determined based on the SFI from the UE; and

means for determining resource quality information (RQI) based on the first and second reference signals.

43. The apparatus of claim 42, further comprising:

means for receiving an RQI request from the first cell; and

means for sending the RQI to the first cell in response to the RQI request.

44. A method of sending data in a wireless communication network, comprising:

sending a resource request from a user equipment (UE) to a first cell;

receiving spatial feedback information (SFI) sent by a second cell to the UE, the UE not communicating with the second cell; and

sending a data transmission from the UE to the first cell based on the SFI to reduce interference to the second cell.

45. The method of claim 44, further comprising:

sending an SFI request from the UE to the second cell, and wherein the SFI is sent by the second cell to the UE in response to the SFI request.

46. The method of claim 44, further comprising:

sending a reference signal by the UE; and

receiving a grant comprising a modulation and coding scheme (MCS) determined by the first cell based on the reference signal, and wherein the data transmission is sent by the UE based on the MCS.

47. The method of claim 46, further comprising:

receiving a reference signal request from the first cell, and wherein the reference signal is sent by the UE in response to the request.

48. The method of claim 44, further comprising:

receiving preceding information from the first cell; and

selecting a preceding matrix based on the preceding information from the first cell and the SFI from the second cell, and wherein the data transmission is sent by the UE with the preceding matrix.

49. The method of claim 44, wherein the sending the data transmission comprises

determining a transmit power level based on a receive nulling gain from the SFI from the second cell, and

sending the data transmission at the determined transmit power level.

50. An apparatus for wireless communication, comprising:

means for sending a resource request from a user equipment (UE) to a first cell;

means for receiving spatial feedback information (SFI) sent by a second cell to the UE, the UE not communicating with the second cell; and

means for sending a data transmission from the UE to the first cell based on the SFI to reduce interference to the second cell.

51. The apparatus of claim 50, further comprising:

means for sending a reference signal by the UE; and

means for receiving a grant comprising a modulation and coding scheme (MCS) determined by the first cell based on the reference signal, and

wherein the data transmission is sent by the UE based on the MCS.

52. The apparatus of claim 50, further comprising:

means for receiving preceding information from the first cell; and

means for selecting a preceding matrix based on the preceding information from the first cell and the SFI from the second cell, and

wherein the data transmission is sent by the UE with the preceding matrix.

53. The apparatus of claim 50, wherein the means for sending the data transmission comprises

means for determining a transmit power level based on a receive nulling gain from the SFI from the second cell, and

means for sending the data transmission at the determined transmit power level.

54. A method of receiving data in a wireless communication network, comprising:

receiving a resource request sent by a first user equipment (UE) to a cell;

sending spatial feedback information (SFI) from the cell to a second UE not communicating with the cell; and

receiving a data transmission sent by the first UE to the cell, the data transmission observing less interference from a transmission sent by the second UE based on the SFI.

55. The method of claim 54, further comprising:

receiving an SFI request sent by the second UE or a serving cell of the second UE to the cell, and wherein the SFI is sent by the cell to the second UE in response to the SFI request.

56. The method of claim 54, further comprising:

receiving a first reference signal sent by the first UE;

receiving a second reference signal sent by the second UE based on the SFI; and

determining resource quality information (RQI) for the first UE based on the first and second reference signals.

57. The method of claim 56, further comprising:

sending a reference signal request to the first UE, and wherein the first reference signal is sent by the first UE in response to the request.

58. The method of claim 56, further comprising:

determining a modulation and coding scheme (MCS) based on the RQI; and

sending a grant comprising the MCS to the first UE, and wherein the data transmission is sent by the first UE based on the MCS.

59. An apparatus for wireless communication, comprising:

means for receiving a resource request sent by a first user equipment (UE) to a cell;

means for sending spatial feedback information (SFI) from the cell to a second UE not communicating with the cell; and

means for receiving a data transmission sent by the first UE to the cell, the data transmission observing less interference from a transmission sent by the second UE based on the SFI.

60. The apparatus of claim 59, further comprising:

means for receiving a first reference signal sent by the first UE;

means for receiving a second reference signal sent by the second UE based on the SFI; and

means for determining resource quality information (RQI) for the first UE based on the first and second reference signals.

61. The apparatus of claim 60, further comprising:

means for determining a modulation and coding scheme (MCS) based on the RQI; and

means for sending a grant comprising the MCS to the first UE, and wherein the data transmission is sent by the first UE based on the MCS.