Transmit power control in multicarrier communications

• US 9,615,339 B2
• Filed: 11/01/2015
• Issued: 04/04/2017
• Est. Priority Date: 04/17/2012
• Status: Active Grant

• Current Assignee: Comcast Cable Communications LLC (Comcast Corporation)
• Original Assignee: Comcast Cable Communications LLC (Comcast Corporation)
• Inventors: Dinan, Esmael Hejazi
• Primary Examiner(s): Lai, Andrew
• Assistant Examiner(s): SHIH, ALBERT K
• Application Number:
  US14/929,398
• Publication Number:
  US 20160057714A1
• Time in Patent Office: 520 Days
• Field of Search: 370329
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/386 centralized, e.g. when the radio network controller or equivalent takes part in the power control
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/53 based on regulatory allocation policies
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

A wireless device receives a control packet comprising an uplink grant to transmit a packet on a secondary cell. The wireless device computes transmission power of the packet employing a parameter calculated by accumulation of an initial value and at least one power control value. The accumulation is reset when: a power information element is received by higher layers; or a random access response is received corresponding to a random access preamble transmitted on the secondary cell.

Claims

1. A wireless device comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the wireless device to;

receive at least one control message comprising configuration parameters of a plurality of cells comprising a primary cell and at least one secondary cell;

receive a control packet comprising an uplink grant to transmit a first packet via a secondary cell of the at least one secondary cell;

compute transmission power of the first packet based on, at least in part, a parameter calculated by accumulation of an initial value and at least one power control value corresponding to a sequence of subframes, wherein the accumulation is reset responsive to;

receiving, via a higher layer, a power information element;

or

receiving a random access response, wherein the random access response corresponds to a random access preamble transmitted on the secondary cell; and

transmit the first packet using radio resources indicated by the uplink grant.

2. The wireless device of claim 1, wherein:

the initial value is zero if the power information element is received in an initial subframe; and

the initial value is a sum of a second power control value and an offset value if the random access response is received.

3. The wireless device of claim 1, wherein the control packet is received using physical downlink control channel (PDCCH) radio resources or enhanced physical downlink control channel (EPDCCH) radio resources.

4. The wireless device of claim 1, wherein a power control value of the at least one power control value corresponds to a subframe in the sequence of subframes and is zero if at least one of the following conditions is satisfied:

the subframe is not an uplink subframe in a time division duplex (TDD) frame structure;

the wireless device has reached a first power level in the subframe and a corresponding power control value is positive;

or

the wireless device has reached a second power level in the subframe and a corresponding power control value is negative.

21. The wireless device of claim 1, wherein the control packet further comprises a power control field corresponding to a power control value of the at least one power control value.

22. The wireless device of claim 21, wherein the power control field comprises a pre-defined power control value.

23. The wireless device of claim 1, wherein the initial value is a power value for a starting subframe in the sequence of subframes, and the at least one power control value is at least one power value for at least one subframe subsequent to the starting subframe in the sequence of subframes.

24. The wireless device of claim 1, wherein the higher layer comprises a radio resource control protocol message comprising the power information element.

25. The wireless device of claim 1, wherein a power control value of the at least one power control value corresponds to a subframe in the sequence of subframes and is zero if at least one of the following conditions is satisfied:

no power control value is received for the subframe;

the wireless device has reached a first power level in the subframe and a corresponding power control value is positive;

or

the wireless device has reached a second power level in the subframe and a corresponding power control value is negative.

26. The wireless device of claim 1, wherein the instructions, when executed by the one or more processors, further cause the wireless device to configure power control accumulations for the secondary cell based on the at least one control message.

27. The wireless device of claim 1, wherein the instructions, when executed by the one or more processors, further cause the wireless device to configure power control accumulations for the secondary cell based on the control packet.

28. The wireless device of claim 1, wherein the accumulation comprises resetting a power control accumulation associated with an uplink carrier of the secondary cell.

29. The wireless device of claim 1, wherein the higher layer comprises a radio resource control layer.

30. The wireless device of claim 2, wherein the offset value corresponds to a power ramp-up from a first to a last random access preamble transmitted by the wireless device during a random access process corresponding to the random access response.

31. The wireless device of claim 4, wherein the first power level corresponds to a maximum power and the second power level corresponds to a minimum power.

5. A method comprising:

receiving at least one control message comprising configuration parameters of a plurality of cells comprising a first cell group and a second cell group, wherein;

uplink transmission timing in the first cell group is based on a first reference cell in the first cell group; and

uplink transmission timing in the second cell group is based on a second reference cell in the second cell group;

receiving a control packet comprising an uplink grant to transmit a first packet via a secondary cell of the second cell group;

computing transmission power of the first packet based on, at least in part, a parameter calculated by accumulation of an initial value and at least one power control value corresponding to a sequence of subframes, wherein the accumulation is reset responsive to;

receiving, via a higher layer, a power information element;

or

receiving a random access response, wherein the random access response corresponds to a random access preamble transmitted on the secondary cell; and

transmitting the first packet using radio resources indicated by the uplink grant.

6. The method of claim 5, wherein the control packet further comprises a power control field corresponding to a power control value of the at least one power control value.

7. The method of claim 6, wherein the power control field comprises a pre-defined power control value.

8. The method of claim 5, wherein the initial value is a power value for a starting subframe in the sequence of subframes, and the at least one power control value is at least one power value for at least one subframe subsequent to the starting subframe in the sequence of subframes.

9. The method of claim 5, wherein the higher layer comprises a radio resource control protocol message comprising the power information element.

10. The method of claim 5, wherein a power control value of the at least one power control value corresponds to a subframe in the sequence of subframes and is zero if at least one of the following conditions is satisfied:

no power control value is received for the subframe;

a wireless device has reached a first power level in the subframe and a corresponding power control value is positive;

or

the wireless device has reached a second power level in the subframe and a corresponding power control value is negative.

11. The method of claim 5, wherein a power control value of the at least one power control value corresponds to a subframe in the sequence of subframes and is zero if at least one of the following conditions is satisfied:

the subframe is not an uplink subframe in a time division duplex (TDD) frame structure;

a wireless device has reached a first power level in the subframe and a corresponding power control value is positive;

or

the wireless device has reached a second power level in the subframe and a corresponding power control value is negative.

12. The method of claim 5, wherein:

the initial value is zero if the power information element is received in an initial subframe; and

the initial value is a sum of a second power control value and an offset value if the random access response is received.

13. The method of claim 12, wherein the offset value corresponds to a power ramp-up from a first to a last random access preamble transmitted by a wireless device during a random access process corresponding to the random access response.

14. The method of claim 5, further comprising causing configuration of power control accumulations for the secondary cell based on the at least one control message.

15. The method of claim 5, further comprising enabling configuration of power control accumulations for the secondary cell based on the control packet.

32. The method of claim 5, wherein the receiving the control packet comprises receiving, via physical downlink control channel (PDCCH) radio resources or enhanced physical downlink control channel (EPDCCH) radio resources, the control packet.

33. The method of claim 5, wherein the accumulation comprises resetting a power control accumulation associated with an uplink carrier of the secondary cell.

34. The method of claim 5, wherein the higher layer comprises a radio resource control layer.

35. The method of claim 10, wherein the first power level corresponds to a maximum power and the second power level corresponds to a minimum power.

36. The method of claim 11, wherein the first power level corresponds to a maximum power and the second power level corresponds to a minimum power.

16. A method comprising:

receiving at least one control message comprising configuration parameters of a plurality of cells comprising a primary cell and at least one secondary cell;

receiving a control packet comprising an uplink grant to transmit a first packet via a secondary cell of the at least one secondary cell;

computing transmission power of the first packet based on, at least in part, a parameter calculated by accumulation of an initial value and at least one power control value corresponding to a sequence of subframes, wherein the accumulation is reset responsive to;

receiving, via a higher layer, a power information element;

or

receiving a random access response, wherein the random access response corresponds to a random access preamble transmitted on the secondary cell; and

transmitting the first packet using radio resources indicated by the uplink grant.

17. The method of claim 16, wherein the initial value is a power value for a starting subframe in the sequence of subframes, and the at least one power control value is at least one power value for at least one subframe subsequent to the starting subframe in the sequence of subframes.

18. The method of claim 16, further comprising causing configuration of power control accumulations for the secondary cell based on the at least one control message.

19. The method of claim 16, further comprising enabling configuration of power control accumulations for the secondary cell based on the control packet.

20. The method of claim 16, wherein the accumulation comprises resetting a power control accumulation associated with an uplink carrier of the secondary cell.

37. The method of claim 16, wherein:

the initial value is zero if the power information element is received in an initial subframe; and

the initial value is a sum of a second power control value and an offset value if the random access response is received.

38. The method of claim 37, wherein the offset value corresponds to a power ramp-up from a first to a last random access preamble transmitted by a wireless device during a random access process corresponding to the random access response.

39. The method of claim 16, wherein the receiving the control packet comprises receiving, via physical downlink control channel (PDCCH) radio resources or enhanced physical downlink control channel (EPDCCH) radio resources, the control packet.

40. The method of claim 16, wherein a power control value of the at least one power control value corresponds to a subframe in the sequence of subframes and is zero if at least one of the following conditions is satisfied:

the subframe is not an uplink subframe in a time division duplex (TDD) frame structure;

a wireless device has reached a first power level in the subframe and a corresponding power control value is positive;

or

the wireless device has reached a second power level in the subframe and a corresponding power control value is negative.

41. The method of claim 16, wherein the control packet further comprises a power control field corresponding to a power control value of the at least one power control value.

42. The method of claim 41, wherein the power control field comprises a pre-defined power control value.

43. The method of claim 16, wherein the higher layer comprises a radio resource control layer.

44. The method of claim 16, wherein the higher layer comprises a radio resource control protocol message comprising the power information element.

45. The method of claim 16, wherein a power control value of the at least one power control value corresponds to a subframe in the sequence of subframes and is zero if at least one of the following conditions is satisfied:

no power control value is received for the subframe;

a wireless device has reached a first power level in the subframe and a corresponding power control value is positive;

or

the wireless device has reached a second power level in the subframe and a corresponding power control value is negative.

46. A wireless device comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the wireless device to;

receive at least one control message comprising configuration parameters of a plurality of cells comprising a primary cell and at least one secondary cell;

receive a control packet comprising an uplink grant to transmit a first packet via a secondary cell of the at least one secondary cell; and

determine transmission power of the first packet based on, at least in part, a parameter calculated by accumulation of an initial value and at least one power control value corresponding to a sequence of subframes, wherein the accumulation is reset responsive to;

receiving, via radio resource control signaling, a power information element;

or

receiving a random access response, wherein the random access response corresponds to a random access preamble transmitted on the secondary cell; and

transmit the first packet using radio resources indicated by the uplink grant.

47. The wireless device of claim 46, wherein:

the initial value is zero if the power information element is received in an initial subframe; and

the initial value is a sum of a second power control value and an offset value if the random access response is received.

48. The wireless device of claim 47, wherein the offset value corresponds to a power ramp-up from a first to a last random access preamble transmitted by the wireless device during a random access process corresponding to the random access response.

49. The wireless device of claim 46, wherein the control packet is received using physical downlink control channel (PDCCH) radio resources or enhanced physical downlink control channel (EPDCCH) radio resources.

50. The wireless device of claim 46, wherein a power control value of the at least one power control value corresponds to a subframe in the sequence of subframes and is zero if at least one of the following conditions is satisfied:

the subframe is not an uplink subframe in a time division duplex (TDD) frame structure;

the wireless device has reached a first power level in the subframe and a corresponding power control value is positive;

or

the wireless device has reached a second power level in the subframe and a corresponding power control value is negative.

51. The wireless device of claim 46, wherein the control packet further comprises a power control field corresponding to a power control value of the at least one power control value.

52. The wireless device of claim 51, wherein the power control field comprises a pre-defined power control value.

53. The wireless device of claim 46, wherein the initial value is a power value for a starting subframe in the sequence of subframes, and the at least one power control value is at least one power value for at least one subframe subsequent to the starting subframe in the sequence of subframes.

54. The wireless device of claim 46, wherein the radio resource control signaling comprises a radio resource control protocol message comprising the power information element.

55. The wireless device of claim 46, wherein a power control value of the at least one power control value corresponds to a subframe in the sequence of subframes and is zero if at least one of the following conditions is satisfied:

no power control value is received for the subframe;

the wireless device has reached a first power level in the subframe and a corresponding power control value is positive;

or

the wireless device has reached a second power level in the subframe and a corresponding power control value is negative.

56. The wireless device of claim 46, wherein the instructions, when executed by the one or more processors, further cause the wireless device to configure power control accumulations for the secondary cell based on the at least one control message.

57. The wireless device of claim 46, wherein the instructions, when executed by the one or more processors, further cause the wireless device to configure power control accumulations for the secondary cell based on the control packet.

58. The wireless device of claim 46, wherein the accumulation comprises resetting a power control accumulation associated with an uplink carrier of the secondary cell.

59. The wireless device of claim 46, wherein the radio resource control signaling is in a radio resource control layer.

60. The wireless device of claim 46, wherein the radio resource control signaling is in a higher layer.

61. The wireless device of claim 60, wherein the higher layer is above a physical layer and a media access control layer.

62. A system comprising:

a base station comprising;

one or more processors; and

memory storing instructions that, when executed by the one or more processors of the base station, cause the base station to;

transmit at least one control message comprising configuration parameters of a plurality of cells comprising a primary cell and at least one secondary cell; and

a wireless device comprising;

one or more processors; and

memory storing instructions that, when executed by the one or more processors of the wireless device, cause the wireless device to;

receive the at least one control message;

receive a control packet comprising an uplink grant to transmit a first packet via a secondary cell of the at least one secondary cell; and

determine transmission power of the first packet based on, at least in part, a parameter calculated by accumulation of an initial value and at least one power control value corresponding to a sequence of subframes, wherein the accumulation is reset responsive to;

receiving, via radio resource control signaling, a power information element;

or

receiving a random access response, wherein the random access response corresponds to a random access preamble transmitted on the secondary cell; and

transmit the first packet using radio resources indicated by the uplink grant.

63. The system of claim 62, wherein:

the initial value is zero if the power information element is received in an initial subframe; and

the initial value is a sum of a second power control value and an offset value if the random access response is received.

64. The system of claim 63, wherein the offset value corresponds to a power ramp-up from a first to a last random access preamble transmitted by the wireless device during a random access process corresponding to the random access response.

65. The system of claim 62, wherein the control packet is received using physical downlink control channel (PDCCH) radio resources or enhanced physical downlink control channel (EPDCCH) radio resources.

66. The system of claim 62, wherein a power control value of the at least one power control value corresponds to a subframe in the sequence of subframes and is zero if at least one of the following conditions is satisfied:

the subframe is not an uplink subframe in a time division duplex (TDD) frame structure;

the wireless device has reached a first power level in the subframe and a corresponding power control value is positive;

or

the wireless device has reached a second power level in the subframe and a corresponding power control value is negative.

67. The system of claim 62, wherein the control packet further comprises a power control field corresponding to a power control value of the at least one power control value.

68. The system of claim 67, wherein the power control field comprises a pre-defined power control value.

69. The system of claim 62, wherein the initial value is a power value for a starting subframe in the sequence of subframes, and the at least one power control value is at least one power value for at least one subframe subsequent to the starting subframe in the sequence of subframes.

70. The system of claim 62, wherein the radio resource control signaling comprises a radio resource control protocol message comprising the power information element.

71. The system of claim 62, wherein a power control value of the at least one power control value corresponds to a subframe in the sequence of subframes and is zero if at least one of the following conditions is satisfied:

no power control value is received for the subframe;

the wireless device has reached a first power level in the subframe and a corresponding power control value is positive;

or

the wireless device has reached a second power level in the subframe and a corresponding power control value is negative.

72. The system of claim 62, wherein the instructions stored in the memory of the wireless device, when executed by the one or more processors of the wireless device, further cause the wireless device to configure power control accumulations for the secondary cell based on the at least one control message.

73. The system of claim 62, wherein the instructions stored in the memory of the wireless device, when executed by the one or more processors of the wireless device, further cause the wireless device to configure power control accumulations for the secondary cell based on the control packet.

74. The system of claim 62, wherein the accumulation comprises resetting a power control accumulation associated with an uplink carrier of the secondary cell.

75. The system of claim 62, wherein the radio resource control signaling is in a radio resource control layer.

76. The system of claim 62, wherein the radio resource control signaling is in a higher layer.

77. The system of claim 76, wherein the higher layer is above a physical layer and a media access control layer.

78. A method comprising:

receiving at least one control message comprising configuration parameters of a plurality of cells comprising a primary cell and at least one secondary cell;

receiving a control packet comprising an uplink grant to transmit a first packet via a secondary cell of the at least one secondary cell;

determining transmission power of the first packet based on, at least in part, a parameter calculated by accumulation of an initial value and at least one power control value corresponding to a sequence of subframes, wherein the accumulation is reset responsive to;

receiving, via radio resource control signaling, a power information element;

or

receiving a random access response, wherein the random access response corresponds to a random access preamble transmitted on the secondary cell; and

transmitting the first packet using radio resources indicated by the uplink grant.

79. The method of claim 78, wherein:

the initial value is zero if the power information element is received in an initial subframe; and

the initial value is a sum of a second power control value and an offset value if the random access response is received.

80. The method of claim 79, wherein the offset value corresponds to a power ramp-up from a first to a last random access preamble transmitted by a wireless device during a random access process corresponding to the random access response.

81. The method of claim 78, wherein the receiving the control packet comprises receiving, via physical downlink control channel (PDCCH) radio resources or enhanced physical downlink control channel (EPDCCH) radio resources, the control packet.

82. The method of claim 78, wherein a power control value of the at least one power control value corresponds to a subframe in the sequence of subframes and is zero if at least one of the following conditions is satisfied:

the subframe is not an uplink subframe in a time division duplex (TDD) frame structure;

a wireless device has reached a first power level in the subframe and a corresponding power control value is positive;

or

the wireless device has reached a second power level in the subframe and a corresponding power control value is negative.

83. The method of claim 78, wherein the control packet further comprises a power control field corresponding to a power control value of the at least one power control value.

84. The method of claim 83, wherein the power control field comprises a pre-defined power control value.

85. The method of claim 78, wherein the initial value is a power value for a starting subframe in the sequence of subframes, and the at least one power control value is at least one power value for at least one subframe subsequent to the starting subframe in the sequence of subframes.

86. The method of claim 78, further comprising receiving the power information element via wherein the radio resource control signaling comprises a radio resource control protocol message comprising the power information element.

87. The method of claim 78, wherein a power control value of the at least one power control value corresponds to a subframe in the sequence of subframes and is zero if at least one of the following conditions is satisfied:

no power control value is received for the subframe;

a wireless device has reached a first power level in the subframe and a corresponding power control value is positive;

or

the wireless device has reached a second power level in the subframe and a corresponding power control value is negative.

88. The method of claim 78, further comprising causing configuration of power control accumulations for the secondary cell based on the at least one control message.

89. The method of claim 78, further comprising enabling configuration of power control accumulations for the secondary cell based on the control packet.

90. The method of claim 78, wherein the accumulation comprises resetting a power control accumulation associated with an uplink carrier of the secondary cell.

91. The method of claim 78, wherein the radio resource control signaling is in a radio resource control layer.

92. The method of claim 78, wherein the radio resource control signaling is in a higher layer.

93. The method of claim 92, wherein the higher layer is above a physical layer and a media access control layer.

94. A method comprising:

transmitting, by a base station and to a wireless device, at least one control message comprising configuration parameters of a plurality of cells comprising a primary cell and at least one secondary cell;

receiving, by the wireless device, the at least one control message;

receiving a control packet comprising an uplink grant to transmit a first packet via a secondary cell of the at least one secondary cell;

determining transmission power of the first packet based on, at least in part, a parameter calculated by accumulation of an initial value and at least one power control value corresponding to a sequence of subframes, wherein the accumulation is reset responsive to;

receiving, via radio resource control signaling, a power information element;

or

receiving a random access response, wherein the random access response corresponds to a random access preamble transmitted on the secondary cell; and

transmitting the first packet using radio resources indicated by the uplink grant.

95. The method of claim 94, wherein:

the initial value is zero if the power information element is received in an initial subframe; and

the initial value is a sum of a second power control value and an offset value if the random access response is received.

96. The method of claim 95, wherein the offset value corresponds to a power ramp-up from a first to a last random access preamble transmitted by the wireless device during a random access process corresponding to the random access response.

97. The method of claim 94, wherein the receiving the control packet comprises receiving, via physical downlink control channel (PDCCH) radio resources or enhanced physical downlink control channel (EPDCCH) radio resources, the control packet.

98. The method of claim 94, wherein a power control value of the at least one power control value corresponds to a subframe in the sequence of subframes and is zero if at least one of the following conditions is satisfied:

the subframe is not an uplink subframe in a time division duplex (TDD) frame structure;

the wireless device has reached a first power level in the subframe and a corresponding power control value is positive;

or

the wireless device has reached a second power level in the subframe and a corresponding power control value is negative.

99. The method of claim 94, wherein the control packet further comprises a power control field corresponding to a power control value of the at least one power control value.

100. The method of claim 99, wherein the power control field comprises a pre-defined power control value.

101. The method of claim 94, wherein the initial value is a power value for a starting subframe in the sequence of subframes, and the at least one power control value is at least one power value for at least one subframe subsequent to the starting subframe in the sequence of subframes.

102. The method of claim 94, wherein the radio resource control signaling comprises a radio resource control protocol message comprising the power information element.

103. The method of claim 94, wherein a power control value of the at least one power control value corresponds to a subframe in the sequence of subframes and is zero if at least one of the following conditions is satisfied:

no power control value is received for the subframe;

the wireless device has reached a first power level in the subframe and a corresponding power control value is positive;

or

the wireless device has reached a second power level in the subframe and a corresponding power control value is negative.

104. The method of claim 94, further comprising causing configuration of power control accumulations for the secondary cell based on the at least one control message.

105. The method of claim 94, further comprising enabling configuration of power control accumulations for the secondary cell based on the control packet.

106. The method of claim 94, wherein the accumulation comprises resetting a power control accumulation associated with an uplink carrier of the secondary cell.

107. The method of claim 94, wherein the radio resource control signaling is in a radio resource control layer.

108. The method of claim 94, wherein the radio resource control signaling is in a higher layer.

109. The method of claim 108, wherein the higher layer is above a physical layer and a media access control layer.