Resource partitioning information for enhanced interference coordination

• US 9,392,608 B2
• Filed: 04/12/2011
• Issued: 07/12/2016
• Est. Priority Date: 04/13/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Song, Osok, Damnjanovic, Aleksandar, Ji, Tingfang, Yoo, Taesang, Agashe, Parag Arun, Vajapeyam, Madhavan Srinivasan, Wei, Yongbin, Luo, Tao, Prakash, Rajat, Kitazoe, Masato
• Primary Examiner(s): Nguyen, Tu X
• Application Number:
  US13/085,373
• Publication Number:
  US 20110275394A1
• Time in Patent Office: 1,918 Days
• Field of Search: 455/450, 455/451, 455/452.1, 455/443
• US Class Current: 1/1
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

Methods and apparatus for partitioning resources for enhanced inter-cell interference coordination (eICIC) are provided. Certain aspects involve broadcasting a message indicating time-domain resource partitioning information (RPI), where a user equipment (UE) may be operating in idle mode. With the RPI, the UE may be able to identify protected resources with reduced/eliminated interference from neighboring cells. The RPI in this broadcasted message may be encoded as a bitmap as an alternative or in addition to enumeration of the U/N/X subframes. Other aspects entail transmitting a dedicated or unicast message indicating the time-domain RPI, where a UE may be operating in connected mode. With the RPI, the UE may be able to determine channel state information (CSI), make radio resource management (RRM) measurements, or perform radio link monitoring (RLM), based on one or more signals from a serving base station during the protected time-domain resources.

Claims

1. A method for wireless communications, comprising:

receiving, at a user equipment (UE), an indication of time domain resource partitioning information (RPI) corresponding to subframe assignments between a serving access point and one or more non-serving access points in a heterogeneous network, wherein the indication of the time domain RPI comprises;

a first information element (IE) indicating first protected subframes associated with the serving access point,

a second IE indicating second protected subframes associated with at least one of the non-serving access points, or

a combination thereof; and

identifying one or more protected subframes based on the time domain RPI, the one or more protected subframes being subframes in which use by an interfering access point is limited.

2. The method of claim 1, wherein the one or more protected subframes comprise an almost blank subframe (ABS) associated with the interfering access point.

3. The method of claim 1, wherein the time domain RPI comprises a bitmap with one or more bits set to a value indicating the one or more protected subframes.

4. The method of claim 1, wherein the indication of the time domain RPI is received from the serving access point.

5. The method of claim 1, wherein the interfering access point is one of the non-serving access points and wherein the one or more protected subframes are associated with the serving access point.

6. The method of claim 5, wherein the interfering access point is associated with a closed subscriber group (CSG) to which the UE does not belong.

7. The method of claim 1, wherein the indication of the time domain RPI is received in a broadcast message.

8. The method of claim 7, wherein the time domain RPI in the broadcast message is associated with a first access point different from a second access point that transmitted the broadcast message, the first and second access points being in the heterogeneous network.

9. The method of claim 7, wherein the time domain RPI is broadcast in a system information block (SIB).

10. The method of claim 9, further comprising receiving a neighbor list from the serving access point, wherein the neighbor list carries the time domain RPI in the SIB.

11. The method of claim 7, wherein the receiving comprises receiving, from the serving access point, the broadcast message comprising the time domain RPI corresponding to the serving access point and wherein the identifying comprises deriving the one or more protected subframes for the one or more non-serving access points based on the protected subframes for the serving access point.

12. The method of claim 11, wherein the deriving comprises considering the one or more protected subframes for the one or more non-serving access points to be the same as the protected subframes for the serving access point.

13. The method of claim 7, wherein the receiving comprises receiving, from the one or more non-serving access points, the broadcast message comprising the time domain RPI about the one or more protected subframes for the one or more non-serving access points.

14. The method of claim 13, wherein the broadcast message comprises a system information block type 1 (SIB1) from the one or more non-serving access points.

15. The method of claim 7, wherein the time domain RPI is broadcast in a master information block (MIB).

16. The method of claim 7, wherein the receiving comprises receiving the broadcast message while the UE is in idle mode.

17. The method of claim 1, wherein the indication of the time domain RPI comprises at least one of a dedicated message or a unicast message.

18. The method of claim 17, wherein the receiving comprises receiving the at least one of the dedicated message or the unicast message while the UE is in connected mode.

19. The method of claim 17, further comprising determining, at the UE, received power of a reference signal from the serving access point during the one or more protected subframes.

20. The method of claim 17, further comprising at least one of determining channel state information (CSI), making radio resource management (RRM) measurements, or performing radio link monitoring (RLM), at the UE, based on one or more signals from the serving access point during the one or more protected subframes.

21. The method of claim 20, wherein the one or more protected time domain resources for RRM are the same as the protected subframes for RLM.

22. The method of claim 21, wherein a single information element (IE) is used to indicate the protected subframes for both RRM and RLM.

23. The method of claim 1, wherein the second IE comprises a cell identity (ID) for each of the at least one of the non-serving access points.

24. The method of claim 1, further comprising at least one of determining channel state information (CSI), making radio resource management (RRM) measurements, or performing radio link monitoring (RLM), at the UE, based on one or more signals from the at least one of the non-serving access points during the second protected subframes.

25. The method of claim 1, wherein the one or more protected subframes are common to the serving access point and the one or more non-serving access points.

26. The method of claim 2, wherein the ABS is limited to carrying a required transmission.

27. The method of claim 2, wherein the ABS is limited to carrying one or more of reference signals (RS), synchronization signals, or control signals.

28. An apparatus for wireless communications, comprising:

a receiver configured to receive an indication of time domain resource partitioning information (RPI) corresponding to subframe assignments between a serving access point and one or more non-serving access points in a heterogeneous network, wherein the indication of the time domain RPI comprises;

a first information element (IE) indicating first protected subframes associated with the serving access point,

a second IE indicating second protected subframes associated with at least one of the non-serving access points, or

a combination thereof; and

at least one processor configured to identify one or more protected subframes based on the time domain RPI, the one or more protected subframes being subframes in which use by an interfering access point is limited.

29. The apparatus of claim 28, wherein the one or more protected subframes comprise an almost blank subframe (ABS) associated with the interfering access point.

30. The apparatus of claim 28, wherein the time domain RPI comprises a bitmap with one or more bits set to a value indicating the one or more protected subframes.

31. The apparatus of claim 28, wherein the indication of the time domain RPI is received from the serving access point.

32. The apparatus of claim 28, wherein the interfering access point is one of the non-serving access points and wherein the one or more protected subframes are associated with the serving access point.

33. The apparatus of claim 32, wherein the interfering access point is associated with a closed subscriber group (CSG) to which the apparatus does not belong.

34. The apparatus of claim 28, wherein the indication of the time domain RPI is received in a broadcast message.

35. The apparatus of claim 34, wherein the time domain RPI in the broadcast message is associated with a first access point different from a second access point that transmitted the broadcast message, the first and second access points being in the heterogeneous network.

36. The apparatus of claim 34, wherein the time domain RPI is broadcast in a system information block (SIB).

37. The apparatus of claim 36, wherein the receiver is configured to receive a neighbor list from the serving access point, wherein the neighbor list carries the time domain RPI in the SIB.

38. The apparatus of claim 34, wherein the receiver is configured to receive, from the serving access point, the broadcast message comprising the time domain RPI corresponding to the serving access point and wherein the at least one processor is configured to identify the one or more protected subframes by deriving the one or more protected subframes for the one or more non-serving access points based on the protected subframes for the serving access point.

39. The apparatus of claim 38, wherein the deriving comprises considering the one or more protected subframes for the one or more non-serving access points to be the same as the protected subframes for the serving access point.

40. The apparatus of claim 34, wherein the receiver is configured to receive, from the one or more non-serving access points, the broadcast message comprising the time domain RPI about the one or more protected subframes for the one or more non-serving access points.

41. The apparatus of claim 40, wherein the broadcast message comprises a system information block type 1 (SIB1) from the one or more non-serving access points.

42. The apparatus of claim 34, wherein the time domain RPI is broadcast in a master information block (MIB).

43. The apparatus of claim 34, wherein the receiver is configured to receive the broadcast message while the apparatus is in idle mode.

44. The apparatus of claim 28, wherein the indication of the time domain RPI comprises at least one of a dedicated message or a unicast message.

45. The apparatus of claim 44, wherein the receiver is configured to receive the at least one of the dedicated message or the unicast message while the apparatus is in connected mode.

46. The apparatus of claim 44, wherein the at least one processor is configured to determine received power of a reference signal from the serving access point during the one or more protected subframes.

47. The apparatus of claim 44, wherein the at least one processor is configured to at least one of determine channel state information (CSI), make radio resource management (RRM) measurements, or perform radio link monitoring (RLM) based on one or more signals from the serving access point during the one or more protected subframes.

48. The apparatus of claim 47, wherein the one or more protected subframes for RRM are the same as the protected subframes for RLM.

49. The apparatus of claim 48, wherein a single information element (IE) is used to indicate the protected subframes for both RRM and RLM.

50. The apparatus of claim 28, wherein the second IE comprises a cell identity (ID) for each of the at least one of the non-serving access points.

51. The apparatus of claim 28, wherein the at least one processor is configured to at least one of determine channel state information (CSI), make radio resource management (RRM) measurements, or perform radio link monitoring (RLM) based on one or more signals from the at least one of the non-serving access points during the second protected subframes.

52. The apparatus of claim 28, wherein the one or more protected subframes are common to the serving access point and the one or more non-serving access points.

53. The apparatus of claim 29, wherein the ABS is limited to carrying a required transmission.

54. The apparatus of claim 29, wherein the ABS is limited to carrying one or more of reference signals (RS), synchronization signals, or control signals.

55. An apparatus for wireless communications, comprising:

means for receiving an indication of time domain resource partitioning information (RPI) corresponding to subframe assignments between a serving access point and one or more non-serving access points in a heterogeneous network, wherein the indication of the time domain RPI comprises;

a first information element (IE) indicating first protected subframes associated with the serving access point,

a second IE indicating second protected subframes associated with at least one of the non-serving access points, or

a combination thereof; and

means for identifying one or more protected subframes based on the time domain RPI, the one or more protected subframes being subframes in which use by an interfering access point is limited.

56. The apparatus of claim 55, wherein the one or more protected subframes comprise an almost blank subframe (ABS) associated with the interfering access point.

57. The apparatus of claim 55, wherein the time domain RPI comprises a bitmap with one or more bits set to a value indicating the one or more protected subframes.

58. The apparatus of claim 55, wherein the indication of the time domain RPI is received from the serving access point.

59. The apparatus of claim 55, wherein the interfering access point is one of the non-serving access points and wherein the one or more protected subframes are associated with the serving access point.

60. The apparatus of claim 55, wherein the indication of the time domain RPI is received in a broadcast message.

61. The apparatus of claim 55, wherein the indication of the time domain RPI comprises at least one of a dedicated message or a unicast message.

62. The apparatus of claim 55, wherein the one or more protected subframes are common to the serving access point and the one or more non-serving access points.

63. The apparatus of claim 56, wherein the ABS is limited to carrying a required transmission.

64. The apparatus of claim 56, wherein the ABS is limited to carrying one or more of reference signals (RS), synchronization signals, or control signals.

65. A non-transitory computer-readable medium having code for:

receiving, at a user equipment (UE), an indication of time domain resource partitioning information (RPI) corresponding to subframe assignments between a serving access point and one or more non-serving access points in a heterogeneous network, wherein the indication of the time domain RPI comprises;

a first information element (IE) indicating first protected subframes associated with the serving access point,

a second IE indicating second protected subframes associated with at least one of the non-serving access points, or

a combination thereof; and

identifying one or more protected subframes based on the time domain RPI, the one or more protected subframes being time subframes in which use by an interfering access point is limited.

66. The computer-readable medium of claim 65, wherein the one or more protected subframes comprise an almost blank subframe (ABS) associated with the interfering access point.

67. The computer-readable medium of claim 65, wherein the time domain RPI comprises a bitmap with one or more bits set to a value indicating the one or more protected subframes.

68. The computer-readable medium of claim 65, wherein the indication of the time domain RPI is received from the serving access point.

69. The computer-readable medium of claim 65, wherein the interfering access point is one of the non-serving access points and wherein the one or more protected subframes are associated with the serving access point.

70. The computer-readable medium of claim 65, wherein the indication of the time domain RPI is received in a broadcast message.

71. The computer-readable medium of claim 65, wherein the indication of the time domain RPI comprises at least one of a dedicated message or a unicast message.

72. The computer-readable medium of claim 65, wherein the one or more protected subframes are common to the serving access point and the one or more non-serving access points.

73. The computer-readable medium of claim 66, wherein the ABS is limited to carrying a required transmission.

74. The computer-readable medium of claim 66, wherein the ABS is limited to carrying one or more of reference signals (RS), synchronization signals, or control signals.