COMPONENT CARRIER POWER CONTROL IN MULTI-CARRIER WIRELESS NETWORK

• US 20110081939A1
• Filed: 10/04/2010
• Published: 04/07/2011
• Est. Priority Date: 10/05/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Montojo, Juan, Gaal, Peter, Damnjanovic, Jelena M.
• Granted Patent: US 9,763,197 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/54 Signalisation aspects of the TPC commands, e.g. frame structure
• CPC Class Codes: H04W 52/58 Format of the TPC bits

Abstract

Techniques for adjusting transmit power of component carriers in a multi-carrier wireless communication system are disclosed. A base station may determine a plurality of associations relating to one or more component carriers configured for use by a user equipment. The user equipment may receive downlink control information from the base station including one or more power control commands and may adjust a transmit power of its component carriers based on the associations. The user equipment may be notified of the associations either implicitly or explicitly.

Claims

1. A method for wireless communications, comprising:

receiving, at a user equipment (UE), control information comprising a group of transmit power control (TPC) commands;

determining, based on a plurality of TPC indices, one or more TPC commands from the group to use for adjusting power of uplink transmissions on a corresponding plurality of component carriers; and

adjusting a transmit power of one or more of the plurality of component carriers in accordance with the determined TPC commands.

2. The method of claim 1, further comprising:

determining an association between each of the plurality of TPC indices and a corresponding one of the plurality of component carriers.

3. The method of claim 2, further comprising receiving an indication of the association via Radio Link Control (RLC) layer signaling.

4. The method of claim 1, further comprising:

determining an association between at least one of the plurality of TPC indices and two or more component carriers in the plurality of component carriers.

5. The method of claim 4, wherein adjusting the transmit power comprises adjusting the transmit power of the two or more component carriers based on a single TPC command from the group of TPC commands.

6. The method of claim 1, wherein each TPC index is associated with at least one of a control channel or a data channel of a corresponding component carrier in the plurality of component carriers.

7. The method of claim 6, wherein adjusting the transmit power further comprises:

adjusting the transmit power of a physical uplink control channel (PUCCH) of a first component carrier in response to a TPC command having a location in the group of TPC commands determined by a first TPC index, and

adjusting the transmit power of a physical uplink shared channel (PUSCH) of the first component carrier in response to a TPC command having a location in the group of TPC commands determined by a second TPC index.

8. The method of claim 1, wherein the transmit power of the plurality of component carriers is adjusted in a substantially concurrent manner.

9. The method of claim 1, wherein at least one of the TPC commands indicates transmit power of one or more corresponding carriers is not to be adjusted.

10. A method for wireless communications, comprising:

determining an association between one or more transmit power control (TPC) indices and a plurality of component carriers, wherein each index is associated with at least one component carrier; and

transmitting, to a user equipment (UE), control information comprising a group of transmit power control (TPC) commands, wherein locations of a plurality of TPC commands in the group for use by the UE for adjusting power of uplink transmissions on corresponding component carriers are selected based on the plurality of TPC indices.

11. The method of claim 10, further comprising transmitting an indication of an association between the plurality of TPC indices and the one or more component carriers via Radio Link Control (RLC) layer signaling.

12. The method of claim 11, wherein the transmitting comprises transmitting an indication of a plurality of TPC indices for a single component carrier.

13. The method of claim 10, wherein the transmitting comprises transmitting an indication of an association between a first TPC index and a first group of component carriers and an association between a second TPC index and a second group of component carriers.

14. The method of claim 13, wherein the transmitting further comprises:

transmitting, at a first time, control information having a TPC command at the first TPC index for use by the UE for adjusting power of uplink transmissions for the first group of component carriers, and

transmitting, at a second time, control information having a TPC command at the second TPC index for use by the UE for adjusting power of uplink transmissions for the second group of component carriers.

15. The method of 13, wherein at least one of the component carriers is included in both the first group of component carriers and the second group of component carriers.

16. A method for wireless communications, comprising:

determining, at a user equipment (UE), an association between one or more Radio Network Temporary Identifiers (RNTIs) and a plurality of component carriers, wherein each RNTI is associated with one or more component carriers;

decoding, using one of the RNTIs, control information comprising one or more transmit power control (TPC) commands; and

adjusting, in accordance with the one or more TPC commands, transmit power of the one or more component carriers associated with the RNTI used in the decoding.

17. The method of claim 16, further comprising receiving an indication of the association between the one or more RNTIs and the one or more component carriers via Radio Link Control (RLC) layer signaling.

18. The method of claim 16, wherein the RNTIs comprise at least one of a physical uplink control channel (PUCCH) RNTI and a physical uplink shared channel (PUSCH) RNTI.

19. The method of claim 16, wherein each RNTI is associated with one or more TPC indices for the one or more component carriers, wherein the one or more TPC indices are used to locate TPC commands associated with each of the component carriers.

20. The method of claim 16, wherein the control information for a physical uplink shared channel (PUSCH) is conveyed in a downlink control information (DCI) message corresponding to an uplink grant.

21. The method of claim 16, wherein the control information for a physical uplink control channel (PUCCH) is conveyed in a downlink control information message corresponding to a downlink grant.

22. A method for wireless communications, comprising:

determining an association between one or more Radio Network Temporary Identifiers (RNTIs) and a plurality of component carriers, wherein each RNTI is associated with one or more component carriers; and

transmitting, to a user equipment (UE), control information comprising one or more transmit power control (TPC) commands, wherein the control information is transmitted using an RNTI selected to indicate to the UE the corresponding one or more component carriers whose power is to be adjusted in accordance with the TPC commands.

23. The method of claim 22, further comprising transmitting an indication of the association between the one or more RNTIs and the plurality of component carriers via Radio Link Control (RLC) layer signaling.

24. The method of claim 22, wherein the selected RNTI relates to at least one of a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

25. The method of claim 22, wherein each RNTI is associated with one or more TPC indices for the one or more component carriers, and wherein the one or more TPC indices are used to locate TPC commands associated with each of the component carriers.

26. The method of claim 22, wherein the control information for a physical uplink shared channel (PUSCH) is conveyed in a downlink control information (DCI) message corresponding to an uplink grant.

27. The method of claim 22, wherein the control information for a physical uplink control channel (PUCCH) is conveyed in a downlink control information message corresponding to a downlink grant.

28. A method for wireless communications, comprising:

receiving, at a user equipment (UE), a downlink control information (DCI) message comprising one or more transmit power control (TPC) commands;

determining one or more TPC commands in the DCI message to use for adjusting power of uplink transmissions on a corresponding plurality of component carriers; and

adjusting transmit power of the plurality of component carriers in accordance with the determined TPC commands.

29. The method of claim 28, wherein the DCI message comprises a plurality of TPC commands, each used to adjust power of a different component carrier.

30. The method of claim 28, wherein:

the DCI message comprises a downlink grant for a physical downlink shared channel (PDSCH); and

a TPC command is applied to a physical uplink control channel (PUCCH) of an uplink carrier where a control feedback for the granted PDSCH is expected.

31. The method of claim 28, wherein:

the DCI message comprises an uplink grant; and

a TPC command is applied to a physical uplink shared channel (PUSCH) of a carrier for which the grant is intended.

32. The method of claim 28, wherein a single TPC command is applied to adjust transmit power of the plurality of component carriers.

33. A method for wireless communications, comprising:

determining control information comprising one or more transmit power control (TPC) commands for adjusting power of uplink transmissions on a corresponding plurality of component carriers assigned to a user equipment; and

transmitting the control information to the UE in a downlink control information (DCI) message.

34. The method of claim 33, wherein the DCI message comprises a plurality of TPC commands, each used to adjust power of a different component carrier.

35. The method of claim 33, wherein the one or more TPC commands comprises a single TPC command to be applied to a plurality of component carriers.

36. An apparatus for wireless communications, comprising:

means for receiving, at a user equipment (UE), control information comprising a group of transmit power control (TPC) commands;

means for determining, based on a plurality of TPC indices, one or more TPC commands from the group to use for adjusting power of uplink transmissions on a corresponding plurality of component carriers; and

means for adjusting a transmit power of one or more of the plurality of component carriers in accordance with the determined TPC commands.

37. The apparatus of claim 36, further comprising:

means for determining an association between each of the plurality of TPC indices and a corresponding one of the plurality of component carriers.

38. The apparatus of claim 37, further comprising means for receiving an indication of the association via Radio Link Control (RLC) layer signaling.

39. The apparatus of claim 36, further comprising:

means for determining an association between at least one of the plurality of TPC indices and two or more component carriers in the plurality of component carriers.

40. The apparatus of claim 39, wherein the means for adjusting the transmit power comprises means for adjusting the transmit power of the two or more component carriers based on a single TPC command from the group of TPC commands.

41. The apparatus of claim 36, wherein each TPC index is associated with at least one of a control channel or a data channel of a corresponding component carrier in the plurality of component carriers.

42. The apparatus of claim 41, wherein the means for adjusting the transmit power further comprises:

means for adjusting the transmit power of a physical uplink control channel (PUCCH) of a first component carrier in response to a TPC command having a location in the group of TPC commands determined by a first TPC index, and

means for adjusting the transmit power of a physical uplink shared channel (PUSCH) of the first component carrier in response to a TPC command having a location in the group of TPC commands determined by a second TPC index.

43. The apparatus of claim 36, wherein the transmit power of the plurality of component carriers is adjusted in a substantially concurrent manner.

44. The apparatus of claim 36, wherein at least one of the TPC commands indicates transmit power of one or more corresponding carriers is not to be adjusted.

45. An apparatus for wireless communications, comprising:

means for determining an association between one or more transmit power control (TPC) indices and a plurality of component carriers, wherein each index is associated with at least one component carrier; and

means for transmitting, to a user equipment (UE), control information comprising a group of transmit power control (TPC) commands, wherein locations of a plurality of TPC commands in the group for use by the UE for adjusting power of uplink transmissions on corresponding component carriers are selected based on the plurality of TPC indices.

46. The apparatus of claim 45, further comprising means for transmitting an indication of an association between the plurality of TPC indices and the one or more component carriers via Radio Link Control (RLC) layer signaling.

47. The apparatus of claim 46, wherein the means for transmitting comprises means for transmitting an indication of a plurality of TPC indices for a single component carrier.

48. The apparatus of claim 45, wherein the means for transmitting comprises means for transmitting an indication of an association between a first TPC index and a first group of component carriers and an association between a second TPC index and a second group of component carriers.

49. The apparatus of claim 48, wherein the means for transmitting further comprises:

means for transmitting, at a first time, control information having a TPC command at the first TPC index for use by the UE for adjusting power of uplink transmissions for the first group of component carriers, and

means for transmitting, at a second time, control information having a TPC command at the second TPC index for use by the UE for adjusting power of uplink transmissions for the second group of component carriers.

50. The apparatus of 48, wherein at least one of the component carriers is included in both the first group of component carriers and the second group of component carriers.

51. An apparatus for wireless communications, comprising:

means for determining, at a user equipment (UE), an association between one or more Radio Network Temporary Identifiers (RNTIs) and a plurality of component carriers, wherein each RNTI is associated with one or more component carriers;

means for decoding, using one of the RNTIs, control information comprising one or more transmit power control (TPC) commands; and

means for adjusting, in accordance with the one or more TPC commands, transmit power of the one or more component carriers associated with the RNTI used in the decoding.

52. The apparatus of claim 51, further comprising means for receiving an indication of the association between the one or more RNTIs and the one or more component carriers via Radio Link Control (RLC) layer signaling.

53. The apparatus of claim 51, wherein the RNTIs comprise at least one of a physical uplink control channel (PUCCH) RNTI and a physical uplink shared channel (PUSCH) RNTI.

54. The apparatus of claim 51, wherein each RNTI is associated with one or more TPC indices for the one or more component carriers, wherein the one or more TPC indices are used to locate TPC commands associated with each of the component carriers.

55. The apparatus of claim 51, wherein the control information for a physical uplink shared channel (PUSCH) is conveyed in a downlink control information (DCI) message corresponding to an uplink grant.

56. The apparatus of claim 51, wherein the control information for a physical uplink control channel (PUCCH) is conveyed in a downlink control information message corresponding to a downlink grant.

57. An apparatus for wireless communications, comprising:

means for determining an association between one or more Radio Network Temporary Identifiers (RNTIs) and a plurality of component carriers, wherein each RNTI is associated with one or more component carriers; and

means for transmitting, to a user equipment (UE), control information comprising one or more transmit power control (TPC) commands, wherein the control information is transmitted using an RNTI selected to indicate to the UE the corresponding one or more component carriers whose power is to be adjusted in accordance with the TPC commands.

58. The apparatus of claim 57, further comprising means for transmitting an indication of the association between the one or more RNTIs and the plurality of component carriers via Radio Link Control (RLC) layer signaling.

59. The apparatus of claim 57, wherein the selected RNTI relates to at least one of a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

60. The apparatus of claim 57, wherein each RNTI is associated with one or more TPC indices for the one or more component carriers, wherein the one or more TPC indices are used to locate TPC commands associated with each of the component carriers.

61. The apparatus of claim 57, wherein the control information for a physical uplink shared channel (PUSCH) is conveyed in a downlink control information (DCI) message corresponding to an uplink grant.

62. The apparatus of claim 57, wherein the control information for a physical uplink control channel (PUCCH) is conveyed in a downlink control information message corresponding to a downlink grant.

63. An apparatus for wireless communications, comprising:

means for receiving, at a user equipment (UE), a downlink control information (DCI) message comprising one or more transmit power control (TPC) commands;

means for determining one or more TPC commands in the DCI message to use for adjusting power of uplink transmissions on a corresponding plurality of component carriers; and

means for adjusting transmit power of the plurality of component carriers in accordance with the determined TPC commands.

64. The apparatus of claim 63, wherein the DCI message comprises a plurality of TPC commands, each used to adjust power of a different component carrier.

65. The apparatus of claim 63, wherein:

the DCI message comprises a downlink grant for a physical downlink shared channel (PDSCH); and

a TPC command is applied to a physical uplink control channel (PUCCH) of an uplink carrier where a control feedback for the granted PDSCH is expected.

66. The apparatus of claim 63, wherein:

the DCI message comprises an uplink grant; and

a TPC command is applied to a physical uplink shared channel (PUSCH) of a carrier for which the grant is intended.

67. The apparatus of claim 63, wherein a single TPC command is applied to adjust transmit power of the plurality of component carriers.

68. An apparatus for wireless communications, comprising:

means for determining control information comprising one or more transmit power control (TPC) commands for adjusting power of uplink transmissions on a corresponding plurality of component carriers assigned to a user equipment; and

means for transmitting the control information to the UE in a downlink control information (DCI) message.

69. The apparatus of claim 68, wherein the DCI message comprises a plurality of TPC commands, each used to adjust power of a different component carrier.

70. The apparatus of claim 68, wherein the one or more TPC commands comprises a single TPC command to be applied to a plurality of component carriers.

71. An apparatus for wireless communications, comprising:

at least one processor configured to

receive, at a user equipment (UE), control information comprising a group of transmit power control (TPC) commands,

determine, based on a plurality of TPC indices, one or more TPC commands from the group to use for adjusting power of uplink transmissions on a corresponding plurality of component carriers, and

adjust a transmit power of one or more of the plurality of component carriers in accordance with the determined TPC commands; and

a memory coupled to the at least one processor.

72. An apparatus for wireless communications, comprising:

at least one processor configured to

determine an association between one or more transmit power control (TPC) indices and a plurality of component carriers, wherein each index is associated with at least one component carrier, and

transmit, to a user equipment (UE), control information comprising a group of transmit power control (TPC) commands, wherein locations of a plurality of TPC commands in the group for use by the UE for adjusting power of uplink transmissions on corresponding component carriers are selected based on the plurality of TPC indices; and

a memory coupled to the at least one processor.

73. An apparatus for wireless communications, comprising:

at least one processor configured to

determine, at a user equipment (UE), an association between one or more Radio Network Temporary Identifiers (RNTIs) and a plurality of component carriers, wherein each RNTI is associated with one or more component carriers, decoding, using one of the RNTIs, control information comprising one or more transmit power control (TPC) commands, and

adjust, in accordance with the one or more TPC commands, transmit power of the one or more component carriers associated with the RNTI used in the decoding; and

a memory coupled to the at least one processor.

74. An apparatus for wireless communications, comprising:

at least one processor configured to

determine an association between one or more Radio Network Temporary Identifiers (RNTIs) and a plurality of component carriers, wherein each RNTI is associated with one or more component carriers, and

transmit, to a user equipment (UE), control information comprising one or more transmit power control (TPC) commands, wherein the control information is transmitted using an RNTI selected to indicate to the UE the corresponding one or more component carriers whose power is to be adjusted in accordance with the TPC commands; and

a memory coupled to the at least one processor.

75. An apparatus for wireless communications, comprising:

at least one processor configured to

receive, at a user equipment (UE), a downlink control information (DCI) message comprising one or more transmit power control (TPC) commands,

determine one or more TPC commands in the DCI message to use for adjusting power of uplink transmissions on a corresponding plurality of component carriers, and

adjust transmit power of the plurality of component carriers in accordance with the determined TPC commands; and

a memory coupled to the at least one processor.

76. An apparatus for wireless communications, comprising:

at least one processor configured to

determine control information comprising one or more transmit power control (TPC) commands for adjusting power of uplink transmissions on a corresponding plurality of component carriers assigned to a user equipment; and

transmit the control information to the UE in a downlink control information (DCI) message; and

a memory coupled to the at least one processor.

77. A computer-program product for wireless communications, comprising a computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:

instructions for receiving, at a user equipment (UE), control information comprising a group of transmit power control (TPC) commands;

instructions for determining, based on a plurality of TPC indices, one or more TPC commands from the group to use for adjusting power of uplink transmissions on a corresponding plurality of component carriers; and

instructions for adjusting a transmit power of one or more of the plurality of component carriers in accordance with the determined TPC commands.

78. A computer-program product for wireless communications, comprising a computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:

instructions for determining an association between one or more transmit power control (TPC) indices and a plurality of component carriers, wherein each index is associated with at least one component carrier; and

instructions for transmitting, to a user equipment (UE), control information comprising a group of transmit power control (TPC) commands, wherein locations of a plurality of TPC commands in the group for use by the UE for adjusting power of uplink transmissions on corresponding component carriers are selected based on the plurality of TPC indices.

79. A computer-program product for wireless communications, comprising a computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:

instructions for determining, at a user equipment (UE), an association between one or more Radio Network Temporary Identifiers (RNTIs) and a plurality of component carriers, wherein each RNTI is associated with one or more component carriers;

instructions for decoding, using one of the RNTIs, control information comprising one or more transmit power control (TPC) commands; and

instructions for adjusting, in accordance with the one or more TPC commands, transmit power of the one or more component carriers associated with the RNTI used in the decoding.

80. A computer-program product for wireless communications, comprising a computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:

instructions for determining an association between one or more Radio Network Temporary Identifiers (RNTIs) and a plurality of component carriers, wherein each RNTI is associated with one or more component carriers; and

instructions for transmitting, to a user equipment (UE), control information comprising one or more transmit power control (TPC) commands, wherein the control information is transmitted using an RNTI selected to indicate to the UE the corresponding one or more component carriers whose power is to be adjusted in accordance with the TPC commands.

81. A computer-program product for wireless communications, comprising a computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:

instructions for receiving, at a user equipment (UE), a downlink control information (DCI) message comprising one or more transmit power control (TPC) commands;

instructions for determining one or more TPC commands in the DCI message to use for adjusting power of uplink transmissions on a corresponding plurality of component carriers; and

instructions for adjusting transmit power of the plurality of component carriers in accordance with the determined TPC commands.

82. A computer-program product for wireless communications, comprising a computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:

instructions for determining control information comprising one or more transmit power control (TPC) commands for adjusting power of uplink transmissions on a corresponding plurality of component carriers assigned to a user equipment; and

instructions for transmitting the control information to the UE in a downlink control information (DCI) message.