Method and apparatus for mitigating relay interference

• US 9,185,711 B2
• Filed: 09/09/2011
• Issued: 11/10/2015
• Est. Priority Date: 09/14/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Lin, Dexu, Palanki, Ravi, Gore, Dhananjay Ashok
• Primary Examiner(s): NGUYEN, MINH TRANG T
• Application Number:
  US13/229,426
• Publication Number:
  US 20120063369A1
• Time in Patent Office: 1,523 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04B 7/15542 Selecting at relay station its transmit and receive resources selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003
• CPC Class Codes: H04B 7/15571 by signal isolation, e.g. isolation by frequency or by antenna pattern, or by polarization
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

Methods and apparatuses are provided that include selecting resources for assigning to a device to mitigate relay self-interference when also communicating with a base station. The resources can be selected based on one or more factors, such as based on resources that are negotiated with the base station, or based on resources indicated as not desired for allocation from the base station, etc. In other examples, reference signals and control data can be communicated such as to mitigate relay self-interference as well.

Claims

1. A method of wireless communication in a full duplex relay, comprising:

receiving an allocation of a first set of resources within a carrier over a subframe for receiving first signals at a relay from a base station;

selecting, at the relay, a second set of resources within the carrier over the subframe that mitigate self-interference with the first set of resources for communicating from the relay to a device; and

transmitting, from the relay, second signals to the device on the second set of resources.

2. The method of claim 1, further comprising indicating to the base station a set of resources over which data reception is not desired from the base station, wherein the selecting the second set of resources comprises selecting the second set of resources from the set of resources.

3. The method of claim 2, wherein the indicating comprises sending, from the relay, a channel quality indicator (CQI) report for the set of resources indicating a CQI value below a threshold CQI level.

4. The method of claim 1, further comprising:

receiving a UE-specific reference signal from the base station in the subframe; and

decoding communications received over the first set of resources using the UE-specific reference signal.

5. The method of claim 1, further comprising:

declaring a second subframe as a multimedia broadcast over single frequency network (MBSFN) subframe to avoid collision with a cell-specific reference signal; and

receiving the cell-specific reference signal from the base station within the second subframe.

6. The method of claim 1, further comprising receiving control data over the first set of resources, wherein the transmitting the second signals comprises transmitting the control data using a lower aggregation level than the control data as received over the first set of resources.

7. The method of claim 1, wherein the receiving the allocation of the first set of resources comprises receiving the allocation in a frequency division multiplexing (FDM) control region.

8. The method of claim 7, wherein the FDM control region is a relay physical downlink control channel (R-PDCCH).

9. The method of claim 1, wherein the first set of resources are semi-statically assigned, and the selecting comprises selecting the second set of resources that do not overlap the first set of resources.

10. An apparatus for wireless communication in a full duplex relay, comprising:

at least one processor configured to;

receive an allocation of a first set of resources within a carrier over a subframe for receiving first signals at a relay from a base station;

select, at the relay, a second set of resources within the carrier over the subframe that mitigate self-interference with the first set of resources for communicating from the relay to a device; and

transmit, from the relay, second signals to the device on the second set of resources; and

a memory coupled to the at least one processor.

11. The apparatus of claim 10, wherein the at least one processor is further configured to indicate to the base station a set of resources over which data reception is not desired from the base station, and the at least one processor selects the second set of resources from the set of resources.

12. The apparatus of claim 11, wherein the at least one processor indicates the set of resources at least in part by sending, from the relay, a channel quality indicator (CQI) report for the set of resources indicating a CQI value below a threshold CQI level.

13. The apparatus of claim 10, wherein the at least one processor is further configured to:

receive a UE-specific reference signal from the base station in the subframe; and

decode communications received over the first set of resources using the UE-specific reference signal.

14. The apparatus of claim 10, wherein the at least one processor is further configured to:

declare a second subframe as a multimedia broadcast over single frequency network (MBSFN) subframe to avoid collision with a cell-specific reference signal; and

receive the cell-specific reference signal from the base station within the second subframe.

15. The apparatus of claim 10, wherein the at least one processor receives the allocation in a frequency division multiplexing (FDM) control region.

16. The apparatus of claim 15, wherein the FDM control region is a relay physical downlink control channel (R-PDCCH).

17. The apparatus of claim 10, wherein the at least one processor is further configured to receive control data over the first set of resources, and wherein the at least one processor transmits the control data in the second signals using a lower aggregation level than the control data as received over the first set of resources.

18. An apparatus for wireless communication in a full duplex relay, comprising:

means for receiving an allocation of a first set of resources within a carrier over a subframe for receiving first signals at a relay from a base station;

means for selecting, at the relay, a second set of resources within the carrier over the subframe that mitigate self-interference with the first set of resources for communicating from the relay to a device; and

means for transmitting, from the relay, second signals to the device over the second set of resources.

19. The apparatus of claim 18, further comprising means for indicating to the base station a set of resources over which data reception is not desired from the base station, wherein the means for selecting selects the second set of resources from the set of resources.

20. The apparatus of claim 19, wherein the means for indicating sends, from the relay, a channel quality indicator (CQI) report for the set of resources indicating a CQI value below a threshold CQI level.

21. The apparatus of claim 18, further comprising means for receiving a UE-specific reference signal from the base station in the subframe for decoding communications received over the first set of resources.

22. The apparatus of claim 18, further comprising means for declaring a second subframe as a multimedia broadcast over single frequency network (MBSFN) subframe to avoid collision with a cell-specific reference signal, and wherein the means for receiving receives the cell-specific reference signal from the base station within the second subframe.

23. The apparatus of claim 18, wherein the means for receiving receives the allocation in a frequency division multiplexing (FDM) control region.

24. The apparatus of claim 23, wherein the FDM control region is a relay physical downlink control channel (R-PDCCH).

25. The apparatus of claim 18, further comprising means for aggregating control data using a lower aggregation level than used for signals over which the control data is received, wherein the means for transmitting receives the control data from the base station over the first set of resources, and transmits the control data with the lower aggregation level over the second set of resources.

26. A

non-transitory computer-readable medium for wireless communication in a full duplex relay, comprising:

code for receiving an allocation of a first set of resources within a carrier over a subframe for receiving first signals at a relay from a base station;

code for selecting, at the relay, a second set of resources within the carrier over the subframe that mitigate self-interference with the first set of resources for communicating from the relay to a device; and

code for transmitting, from the relay, second signals to the device on the second set of resources.

27. The computer-readable medium of claim 26, further comprising code for indicating to the base station a set of resources over which data reception is not desired from the base station, and the code for selecting selects the second set of resources from the set of resources.

28. The computer-readable medium of claim 27, wherein the code for indicating sends, from the relay, a channel quality indicator (CQI) report for the set of resources indicating a CQI value below a threshold CQI level.

29. The computer-readable medium of claim 26, further comprising:

code for receiving a UE-specific reference signal from the base station in the subframe; and

code for decoding communications received over the first set of resources using the UE-specific reference signal.

30. The computer-readable medium of claim 26, further comprising:

code for declaring a second subframe as a multimedia broadcast over single frequency network (MBSFN) subframe to avoid collision with a cell-specific reference signal; and

code for receiving the cell-specific reference signal from the base station within the second subframe.

31. The computer-readable medium of claim 26, wherein the code for receiving receives the allocation in a frequency division multiplexing (FDM) control region.

32. The computer-readable medium of claim 31, wherein the FDM control region is a relay physical downlink control channel (R-PDCCH).

33. The computer-readable medium of claim 26, further comprising code for receiving control data over the first set of resources, and the code for transmitting transmits the control data in the second signals using a lower aggregation level than the control data as received over the first set of resources.

34. An apparatus for wireless communication in a full duplex relay, comprising:

a resource allocation receiving component for receiving an allocation of a first set of resources within a carrier over a subframe for receiving first signals at a relay from a base station;

a device resource allocating component for selecting, at the relay, a second set of resources within the carrier over the subframe that mitigate self-interference with the first set of resources for communicating from the relay to a device; and

a communicating component for transmitting, from the relay, second signals to the device over the second set of resources.

35. The apparatus of claim 34, further comprising a component for indicating to the base station a set of resources over which data reception is not desired from the base station, wherein the device resource allocating component selects the second set of resources from the set of resources.

36. The apparatus of claim 35, wherein the component is a resource allocation influencing component that sends, from the relay, a channel quality indicator (CQI) report for the set of resources indicating a CQI value below a threshold CQI level.

37. The apparatus of claim 34, further comprising a reference signal receiving component for receiving a UE-specific reference signal from the base station in the subframe for decoding communications received over the first set of resources.

38. The apparatus of claim 34, further comprising a reference signal receiving component for declaring a second subframe as a multimedia broadcast over single frequency network (MBSFN) subframe to avoid collision with a cell-specific reference signal and for receiving the cell-specific reference signal from the base station within the second subframe.

39. The apparatus of claim 34, wherein the resource allocation receiving component receives the allocation in a frequency division multiplexing (FDM) control region.

40. The apparatus of claim 39, wherein the FDM control region is a relay physical downlink control channel (R-PDCCH).

41. The apparatus of claim 34, further comprising a control data aggregating component for aggregating control data for transmission over the second set of resources using a lower aggregation level than the control data as received over the first set of resources, wherein the communicating component receives control data from the base station over the first set of resources.

42. A method of wireless communication in a full duplex relay, comprising:

receiving an allocation of a first set of resources within a carrier over a subframe from a base station for transmitting signals from a relay to the base station;

selecting, at the relay, a second set of resources within the carrier over the subframe that mitigate self-interference with the first set of resources for receiving signals from the device at the relay; and

allocating the second set of resources to the device for transmitting second signals to the relay.

43. The method of claim 42, further comprising indicating to the base station a set of resources over which assignment for data transmission to the base station is not desired, wherein the selecting the second set of resources comprises selecting the second set of resources from the set of resources.

44. The method of claim 43, wherein the indicating comprises sending a sounding reference signal (SRS) transmission with signal power below a threshold level on the set of resources.

45. The method of claim 42, further comprising transmitting a first reference signal over the first set of resources, wherein a second reference signal is received over the second set of resources.

46. The method of claim 45, further comprising utilizing a different Zadoff-Chu sequence or phase rotation for encoding the first reference signal than a Zadoff-Chu sequence or phase rotation used for encoding the second reference signal.

47. The method of claim 45, further comprising assigning a hopping pattern to the device for the second reference signal that mitigates collision with the first reference signal.

48. The method of claim 42, wherein the first set of resources correspond to a first control channel and the second set of resources correspond to second control channel.

49. The method of claim 48, wherein the selecting comprises selecting the second set of resources from a portion of an over-provisioned control region that does not overlap the first set of resources.

50. The method of claim 48, further comprising receiving control data from the device over a shared data channel region, wherein the selecting comprises selecting the second set of resources within the shared data channel region.

51. An apparatus for wireless communication in a full duplex relay, comprising:

at least one processor configured to;

receive an allocation of a first set of resources within a carrier over a subframe from a base station for transmitting signals from a relay to the base station;

select, at the relay, a second set of resources within the carrier over the subframe that mitigate self-interference with the first set of resources for receiving signals from the device at the relay; and

allocate the second set of resources to the device for transmitting second signals to the relay; and

a memory coupled to the at least one processor.

52. The apparatus of claim 51, wherein the at least one processor is further configured to indicate to the base station a set of resources over which assignment for data transmission to the base station is not desired, and the at least one processor selects the second set of resources from the set of resources.

53. The apparatus of claim 52, wherein the at least one processor indicates the set of resources at least in part by sending a sounding reference signal (SRS) transmission with signal power below a threshold level on the set of resources.

54. The apparatus of claim 51, wherein the at least one processor is further configured to transmit a first reference signal over the first set of resources, wherein a second reference signal is received over the second set of resources.

55. The apparatus of claim 54, wherein the at least one processor is further configured to utilize a different Zadoff-Chu sequence or phase rotation for encoding the first reference signal than a Zadoff-Chu sequence or phase rotation used for encoding the second reference signal.

56. The apparatus of claim 54, wherein the at least one processor is further configured to assign a hopping pattern to the device for the second reference signal that mitigates collision with the first reference signal.

57. The apparatus of claim 51, wherein the first set of resources correspond to a first control channel and the second set of resources correspond to second control channel.

58. The apparatus of claim 57, wherein the at least one processor selects the second set of resources from a portion of an over-provisioned control region that does not overlap the first set of resources.

59. The apparatus of claim 57, wherein the at least one processor selects the second set of resources within a shared data channel region.

60. An apparatus for wireless communication in a full duplex relay, comprising:

means for receiving an allocation of a first set of resources within a carrier over a subframe from a base station for transmitting signals from a relay to the base station; and

means for selecting, at the relay, a second set of resources within the carrier over the subframe that mitigate self-interference with the first set of resources for receiving signals from the device at the relay, and allocating the second set of resources to the device for transmitting second signals to the relay.

61. The apparatus of claim 60, further comprising means for indicating to the base station a set of resources over which assignment for data transmission to the base station is not desired, wherein the means for selecting selects the second set of resources from the set of resources.

62. The apparatus of claim 61, wherein the means for indicating sends a sounding reference signal (SRS) transmission with signal power below a threshold level on the set of resources.

63. The apparatus of claim 60, further comprising means for transmitting a first reference signal over the first set of resources, wherein a second reference signal is received over the second set of resources.

64. The apparatus of claim 63, further comprising means for utilizing a different Zadoff-Chu sequence or phase rotation for encoding the first reference signal than a Zadoff-Chu sequence or phase rotation used for encoding the second reference signal.

65. The apparatus of claim 63, further comprising means for assigning a hopping pattern to the device for the second reference signal that mitigates collision with the first reference signal.

66. The apparatus of claim 60, wherein the first set of resources correspond to a first control channel and the second set of resources correspond to second control channel.

67. The apparatus of claim 66, wherein the means for selecting selects the second set of resources from a portion of an over-provisioned control region that does not overlap the first set of resources.

68. The apparatus of claim 66, further comprising means for receiving control data from the device over a shared data channel region, wherein the means for selecting selects the second set of resources within the shared data channel region.

69. A

non-transitory computer-readable medium for wireless communication in a full duplex relay, comprising:

code for receiving an allocation of a first set of resources within a carrier over a subframe from a base station for transmitting signals from a relay to the base station;

code for selecting, at the relay, a second set of resources within the carrier over the subframe that mitigate self-interference with the first set of resources for receiving signals from the device at the relay; and

code for allocating the second set of resources to the device for transmitting second signals to the relay.

70. The computer-readable medium of claim 69, further comprising code for indicating to the base station a set of resources over which assignment for data transmission to the base station is not desired, wherein the code for selecting selects the second set of resources from the set of resources.

71. The computer-readable medium of claim 70, wherein the code for indicating sends a sounding reference signal (SRS) transmission with signal power below a threshold level on the set of resources.

72. The computer-readable medium of claim 69, further comprising code for transmitting a first reference signal over the first set of resources, wherein a second reference signal is received over the second set of resources.

73. The computer-readable medium of claim 72, further comprising code for utilizing a different Zadoff-Chu sequence or phase rotation for encoding the first reference signal than a Zadoff-Chu sequence or phase rotation used for encoding the second reference signal.

74. The computer-readable medium of claim 72, further comprising code for assigning a hopping pattern to the device for the second reference signal that mitigates collision with the first reference signal.

75. The computer-readable medium of claim 69, wherein the first set of resources correspond to a first control channel and the second set of resources correspond to second control channel.

76. The computer-readable medium of claim 75, wherein the code for selecting selects the second set of resources from a portion of an over-provisioned control region that does not overlap the first set of resources.

77. The computer-readable medium of claim 75, wherein the code for selecting selects the second set of resources within a shared data channel region.

78. An apparatus for wireless communication in a full duplex relay, comprising:

a resource allocation receiving component for receiving an allocation of a first set of resources within a carrier over a subframe from a base station for transmitting signals at a relay to the base station; and

a component for selecting, at the relay, a second set of resources within the carrier over the subframe that mitigate self-interference with the first set of resources for receiving signals from the device at the relay, and allocating the second set of resources to the device for transmitting second signals to the relay.

79. The apparatus of claim 78, further comprising another component for indicating to the base station a set of resources over which assignment for data transmission to the base station is not desired, wherein the component is a device resource allocating component that selects the second set of resources from the set of resources.

80. The apparatus of claim 79, wherein the another component for indicating is a resource allocation influencing component that sends a sounding reference signal (SRS) transmission with signal power below a threshold level on the set of resources.

81. The apparatus of claim 78, further comprising a communicating component for transmitting a first reference signal over the first set of resources, and receiving a second reference signal over the second set of resources.

82. The apparatus of claim 81, further comprising a reference signal parameter defining component for utilizing a different Zadoff-Chu sequence or phase rotation for encoding the first reference signal than a Zadoff-Chu sequence or phase rotation used for encoding the second reference signal.

83. The apparatus of claim 81, further comprising a reference signal parameter defining component for assigning a hopping pattern to the device for the second reference signal that mitigates collision with the first reference signal.

84. The apparatus of claim 78, wherein the first set of resources correspond to a first control channel and the second set of resources correspond to second control channel.

85. The apparatus of claim 84, wherein the component for selecting is a control resource allocating component that selects the second set of resources from a portion of an over-provisioned control region that does not overlap the first set of resources.

86. The apparatus of claim 84, further comprising a communicating component for receiving control data from the device over a shared data channel region, wherein the component for selecting is a control resource allocating component that selects the second set of resources within the shared data channel region.