Carrier grouping for power headroom report

• US 9,084,209 B2
• Filed: 11/08/2011
• Issued: 07/14/2015
• Est. Priority Date: 11/09/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gaal, Peter, Gheorghiu, Valentin Alexandru, Ho, Sai Yiu Duncan, Damnjanovic, Jelena M.
• Primary Examiner(s): Sobutka, Philip
• Application Number:
  US13/291,756
• Publication Number:
  US 20120115537A1
• Time in Patent Office: 1,344 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04W 52/146 Uplink power control
• 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 52/365 Power headroom reporting

Abstract

Methods, systems, devices, and computer program products are disclosed which facilitate the transmission and reception of power headroom reports for component carriers in a multi carrier wireless communication system. A mobile device may determine available power headroom in a multicarrier configuration through a calculation of a maximum transmit power associated with a first component carrier (CC) in a subset of the CCs. The calculation can account for increases in transmit power of other component carriers in the subset by proportionally increasing transmit powers for each of the subset of CCs. A power headroom may be identified for one or more of the CCs based on a result of the calculation, and a power headroom report (PHR) may be generated that includes the power headroom available for the first CC.

Claims

1. A method of wireless communication in a multicarrier system, comprising:

determining a set of uplink component carriers to be transmitted concurrently by a mobile device;

calculating a maximum transmit power associated with a first uplink component carrier in the set, the calculation accounting for increases in transmit power of each uplink component carrier in at least a first subset of the uplink component carriers that includes the first uplink component carrier by proportionally increasing transmit powers for each of the first subset of uplink component carriers;

identifying power headroom available for the first uplink component carrier based on a result of calculating the maximum transmit power;

generating a first type of power headroom report (PHR) comprising the power headroom available for the first uplink component carrier; and

transmitting a PHR communication including the first type of PHR.

2. The method of claim 1, wherein proportionally increasing transmit powers comprises increasing transmit powers for each of the first subset of uplink component carriers by substantially equal amounts as measured in dB.

3. The method of claim 1, wherein each of the first subset of uplink component carriers are to be transmitted concurrently with support from a same power amplifier.

4. The method of claim 1, further comprising:

calculating a second maximum transmit power associated with a second uplink component carrier of a second subset of the uplink component carriers, the calculation accounting for the power headroom available on the second uplink component carrier independently of other concurrently transmitted uplink component carriers;

identifying power headroom available for the second uplink component carrier based on a result of calculating the second maximum transmit power;

generating a second type of power headroom report (PHR) comprising the power headroom available for the second uplink component carrier; and

transmitting the PHR communication including the second type of PHR.

5. The method of claim 4, further comprising:

transmitting a signal to indicate which of the first type and second type of PHR is included in the PHR communication.

6. The method of claim 4, wherein each of the first subset of uplink component carriers are transmitted in a first frequency band, and the second uplink component carrier is transmitted in a second frequency band that is different than the first frequency band.

7. The method of claim 6, wherein a power amplifier that supports transmission of each uplink component carrier is determined based on the frequency band of the uplink component carrier.

8. The method of claim 4, wherein the second subset of uplink component carriers includes a single uplink component carrier, and the first subset of uplink component carriers includes two uplink component carriers.

9. The method of claim 8, wherein first subset of uplink component carriers includes the first uplink component carrier and a third uplink component carrier, and the PHR communication includes available power headroom corresponding to the third uplink component carrier that is based on the calculated maximum transmit power for the first uplink component carrier.

10. The method of claim 1, further comprising:

transmitting a signal to indicate the PHR communication is based on calculated maximum transmit power for only the first uplink component carrier.

11. The method of claim 1, wherein the first type of PHR is based on the calculated maximum transmit power for each uplink component carrier.

12. The method of claim 1, wherein each of the first subset of uplink component carriers are transmitted concurrently with support from a first power amplifier, and at least a second uplink component carrier is transmitted concurrently from the mobile device with support from a second power amplifier.

13. The method of claim 12, further comprising:

calculating a second maximum transmit power associated with the second uplink component carrier, the calculation accounting for the power headroom available on the second uplink component carrier independently of other uplink component carriers; and

generating a second type of PHR based on the second calculated maximum transmit power, and wherein transmitting the PHR communication comprises transmitting the second type of PHR.

14. The method of claim 13, wherein the first subset of uplink component carriers includes the first uplink component carrier and a third uplink component carrier, and the maximum transmit power for the third uplink component carrier is determined based on the calculated maximum transmit power for the first uplink component carrier.

15. The method of claim 14, further comprising:

transmitting a signal to indicate the first type of PHR is based on the calculated maximum transmit power for only the first uplink component carrier and that the second type of PHR is based on the second calculated maximum transmit power.

16. The method of claim 13, wherein the first type of PHR is based on the calculated maximum transmit power for each uplink component carrier of the first subset, and the second type of PHR is based on the second calculated maximum transmit power.

17. An apparatus for reporting power headroom in a multi uplink component carrier wireless communication system, comprising:

a power headroom calculation module configured to;

calculate a maximum transmit power associated with a first uplink component carrier in a set of concurrently transmitted uplink component carriers, the calculation accounting for increases in transmit power of each uplink component carrier in at least a first subset of the uplink component carriers that includes the first uplink component carrier by proportionally increasing transmit powers for each of the first subset of uplink component carriers; and

identify a power headroom available for the first uplink component carrier based on the calculated the maximum transmit power;

a power headroom reporting module configured to generate a first type of power headroom report (PHR) comprising the power headroom available for the first uplink component carrier; and

a transmitter module configured to transmit a PHR communication including the first type of PHR.

18. The apparatus of claim 17, wherein proportionally increasing transmit powers comprises increasing transmit powers for each of the first subset of uplink component carriers by substantially equal amounts as measured in dB.

19. The apparatus of claim 17, wherein the transmitter module comprises two or more power amplifiers, and each of the first subset of uplink component carriers are to be transmitted concurrently with support from a same power amplifier.

20. The apparatus of claim 17, wherein:

the power headroom calculation module is further configured to;

calculate a second maximum transmit power associated with a second uplink component carrier of a second subset of the uplink component carriers, the calculation accounting for the power headroom available on the second uplink component carrier independently of other concurrently transmitted uplink component carriers; and

identify power headroom available for the second uplink component carrier based on a result of calculating the second maximum transmit power;

the power headroom reporting module is further configured to generate a second type of power headroom report (PHR) comprising the power headroom available for the second uplink component carrier; and

the transmitter module is further configured to transmit the PHR communication including the second type of PHR.

21. The apparatus of claim 20, wherein each of the first subset of uplink component carriers are transmitted in a first frequency band, and the second uplink component carrier is transmitted in a second frequency band that is different than the first frequency band.

22. The apparatus of claim 21, wherein a power amplifier that supports transmission of each uplink component carrier is determined based on the frequency band of the uplink component carrier.

23. The apparatus of claim 20, wherein the second subset of uplink component carriers includes a single uplink component carrier, and the first subset of uplink component carriers includes two uplink component carriers.

24. The apparatus of claim 17, wherein the transmitter module is further configured to transmit a signal to indicate the PHR communication is based on calculated maximum transmit power for only the first uplink component carrier.

25. A computer program product for reporting power headroom from a mobile device, the computer program product comprising:

a non-transitory computer-readable medium comprising;

code for determining a set of uplink component carriers to be transmitted concurrently by a mobile device;

code for calculating a maximum transmit power associated with a first uplink component carrier in the set, the calculation accounting for increases in transmit power of each uplink component carrier in at least a first subset of the uplink component carriers that includes the first uplink component carrier by proportionally increasing transmit powers for each of the first subset of uplink component;

code for identifying power headroom available for the first uplink component carrier based on a result of calculating the maximum transmit power;

code for generating a first type of power headroom report (PHR) comprising the power headroom available for the first uplink component carrier; and

code for transmitting a PHR communication including the first type of PHR.

26. The computer program product of claim 25 wherein proportionally increasing transmit powers comprises increasing transmit powers for each of the first subset of uplink component carriers by substantially equal amounts as measured in dB.

27. The computer program product of claim 25, wherein the non-transitory computer-readable medium further comprises:

code for calculating a second maximum transmit power associated with a second uplink component carrier of a second subset of the uplink component carriers, the calculation accounting for the power headroom available on the second uplink component carrier independently of other concurrently transmitted uplink component carriers;

code for identifying power headroom available for the uplink second component carrier based on a result of calculating the second maximum transmit power;

code for generating a second type of power headroom report (PHR) comprising the power headroom available for the second uplink component carrier; and

code for transmitting the PHR communication including the second type of PHR.

28. The computer program product of claim 27, wherein the non-transitory computer-readable medium further comprises:

code for transmitting a signal to indicate which of the first type and second type of PHR is included in the PHR communication.

29. The computer program product of claim 27, wherein each of the first subset of uplink component carriers are transmitted in a first frequency band, and the second uplink component carrier is transmitted in a second frequency band that is different than the first frequency band.

30. The computer program product of claim 25, wherein the non-transitory computer-readable medium further comprises:

code for transmitting a signal to indicate the PHR communication is based on calculated maximum transmit power for only the first uplink component carrier.

31. A system for reporting power headroom in a multicarrier wireless communication system, comprising:

means for determining a set of uplink component carriers to be transmitted concurrently by a mobile device;

means for calculating a maximum transmit power associated with a uplink first component carrier in the set, the calculation accounting for increases in transmit power of each uplink component carrier in at least a first subset of the uplink component carriers that includes the first uplink component carrier by proportionally increasing transmit powers for each of the first subset of uplink component carriers;

means for identifying power headroom available for the first uplink component carrier based on a result of calculating the maximum transmit power;

means for generating a first type of power headroom report (PHR) comprising the power headroom available for the first uplink component carrier; and

means for transmitting a PHR communication including the first type of PHR.

32. The system of claim 31, wherein proportionally increasing transmit powers comprises increasing transmit powers for each of the first subset of uplink component carriers by substantially equal amounts as measured in dB.

33. The system of claim 31, further comprising:

means for calculating a second maximum transmit power associated with a second uplink component carrier of a second subset of the uplink component carriers, the calculation accounting for the power headroom available on the second uplink component carrier independently of other concurrently transmitted uplink component carriers;

means for identifying power headroom available for the second uplink component carrier based on a result of calculating the second maximum transmit power;

means for generating a second type of power headroom report (PHR) comprising the power headroom available for the second uplink component carrier; and

means for transmitting the PHR communication including the second type of PHR.

34. The system of claim 33, further comprising:

means for transmitting a signal to indicate which of the first type and second type of PHR is included in the PHR communication.

35. The system of claim 33, wherein each of the first subset of uplink component carriers are transmitted in a first frequency band, and the second uplink component carrier is transmitted in a second frequency band that is different than the first frequency band.

36. The system of claim 35, wherein a power amplifier that supports transmission of each uplink component carrier is determined based on the frequency band of the uplink component carrier.

37. The system of claim 31, further comprising:

means for transmitting a signal to indicate the PHR communication is based on calculated maximum transmit power for only the first uplink component carrier.

38. A method of wireless communication in a multicarrier system, comprising:

identifying power headroom available at a mobile device for each of a plurality of uplink component carriers to be transmitted concurrently from the mobile device;

determining that a first type of power headroom report (PHR) is to be generated when one power amplifier is to be used for supporting transmission of two or more of the uplink component carriers, and that a second type of PHR is to be generated when one power amplifier is to be used for supporting transmission of one of the uplink component carriers;

calculating a maximum transmit power for one or more of the uplink component carriers based on the one or more types of PHR;

generating a PHR communication including one or more of the first and second type of PHR based on the determining, the one or more PHR based on the calculated maximum transmit power; and

transmitting the PHR communication.

39. The method of claim 38, wherein calculating a maximum transmit power comprises:

calculating, when it is determined that the first type of PHR is to be generated, a maximum transmit power associated with at least one of the two or more uplink component carriers, the calculation accounting for the power headroom available at each of the two or more uplink component carriers by proportionally increasing transmit powers for each uplink component carrier by a substantially equal amount.

40. The method of claim 38, wherein calculating a maximum transmit power comprises:

calculating, when it is determined that the second type of PHR is to be generated, a maximum transmit power associated with the one uplink component carrier, the calculation accounting for the power headroom available at the one uplink component carrier independently of any increase in transmit power of other of the uplink component carriers.

41. The method of claim 38, further comprising:

transmitting a signal to indicate which of the first type and second type of PHR is transmitted.

42. The method of claim 38, wherein each of the two or more uplink component carriers are transmitted in a first frequency band, and the one uplink component carrier is transmitted in a second frequency band that is different than the first frequency band.

43. The method of claim 42, wherein the power amplifier that supports transmission of each uplink component carrier is determined based on the frequency band of the uplink component carrier.

44. The method of claim 42, wherein the first type of PHR includes power headroom information for one of the two or more uplink component carriers based on the calculated maximum transmit power for another of the two or more uplink component carriers.

45. The method of claim 38, further comprising:

transmitting a signal to indicate the first type of PHR is based on calculated maximum transmit power for only one of the two or more uplink component carriers when the first maximum transmit power is calculated.

46. A computer program product for reporting power headroom from a mobile device, the computer program product comprising:

a non-transitory computer-readable medium comprising;

code for identifying power headroom available at a mobile device for each of a plurality of uplink component carriers to be transmitted concurrently from the mobile device;

code for determining that a first type of power headroom report (PHR) is to be generated when one power amplifier is to be used for supporting transmission of two or more of the uplink component carriers, and that a second type of PHR is to be generated when one power amplifier is to be used for supporting transmission of one of the uplink component carriers;

code for calculating a maximum transmit power for one or more of the uplink component carriers based on the one or more types of PHR;

code for generating a PHR communication including one or more of the first and second type of PHR based on the determining, the one or more PHR based on the calculated maximum transmit power; and

code for transmitting the PHR communication.

47. The computer program product of claim 46, wherein the code for calculating a maximum transmit power comprises:

code for calculating, when it is determined that the first type of PHR is to be generated, a maximum transmit power associated with at least one of the two or more uplink component carriers, the calculation accounting for the power headroom available at each of the two or more uplink component carriers by proportionally increasing transmit powers for each uplink component carrier by a substantially equal amount.

48. The computer program product of claim 46, wherein the code for calculating a maximum transmit power comprises:

code for calculating, when it is determined that the second type of PHR is to be generated, a maximum transmit power associated with the one uplink component carrier, the calculation accounting for the power headroom available at the one uplink component carrier independently of any increase in transmit power of other of the uplink component carriers.

49. A multicarrier wireless communication system, comprising:

means for identifying power headroom available at a mobile device for each of a plurality of uplink component carriers to be transmitted concurrently from the mobile device;

means for determining that a first type of power headroom report (PHR) is to be generated when one power amplifier is to be used for supporting transmission of two or more of the uplink component carriers, and that a second type of PHR is to be generated when one power amplifier is to be used for supporting transmission of one of the uplink component carriers;

means for calculating a maximum transmit power for one or more of the uplink component carriers based on the one or more types of PHR;

means for generating a PHR communication including one or more of the first and second type of PHR based on the determining, the one or more PHR based on the calculated maximum transmit power; and

means for transmitting the PHR communication.

50. The system of claim 49, wherein the means for calculating a maximum transmit power comprises:

means for calculating, when it is determined that the first type of PHR is to be generated, a maximum transmit power associated with at least one of the two or more uplink component carriers, the calculation accounting for the power headroom available at each of the two or more uplink component carriers by proportionally increasing transmit powers for each uplink component carrier by a substantially equal amount.

51. The system of claim 49, wherein the means for calculating a maximum transmit power comprises:

means for calculating, when it is determined that the second type of PHR is to be generated, a maximum transmit power associated with the one uplink component carrier, the calculation accounting for the power headroom available at the one uplink component carrier independently of any increase in transmit power of other of the uplink component carriers.

52. The system of claim 49, further comprising:

means for transmitting a signal to indicate which of the first type and second type of PHR is transmitted.

53. The system of claim 49, wherein each of the two or more uplink component carriers are transmitted in a first frequency band, and the one uplink component carrier is transmitted in a second frequency band that is different than the first frequency band.

54. The system of claim 49, wherein the power amplifier that supports transmission of each uplink component carrier is determined based on the frequency band of the uplink component carrier.

55. The system of claim 49, further comprising:

means for transmitting a signal to indicate the first type of PHR is based on calculated maximum transmit power for only one of the two or more uplink component carriers when the first maximum transmit power is calculated.

56. A wireless communication apparatus, comprising:

a receiver module configured to receive a power headroom report (PHR) communication that comprises one or more of a first type of PHR and a second type of PHR, the first type of PHR comprising first power headroom information that is based on a first maximum transmit power associated with two or more uplink component carriers to be concurrently transmitted through a single power amplifier, and the second type of PHR comprising second power headroom information that is based on a second maximum transmit power associated with a selected one uplink component carrier transmitted through a single power amplifier; and

a power headroom determination module configured to determine which of the one or more of the first type and second type of PHR are included in the PHR communication, and to determine maximum transmit power for one or more to be concurrently transmitted uplink component carriers based on the PHR communication and the one or more types of PHR included in the PHR communication.

57. The apparatus of claim 56, wherein the power headroom determination module is further configured to determine that the PHR communication includes the first type of PHR when the two or more uplink component carriers are in the same frequency band.

58. The apparatus of claim 57, wherein the power headroom determination module is further configured to determine the maximum transmit power for the two or more uplink component carriers by accounting for the first maximum transmit power being calculated by proportionally increasing transmit powers for each of the plurality of uplink component carriers.

59. The apparatus of claim 56, wherein the power headroom determination module is further configured to determine that the PHR communication includes the second type of PHR when the selected one uplink component carrier is in a frequency band that is different than the frequency band of other of the plurality of uplink component carriers.

60. The apparatus of claim 59, wherein the power headroom determination module is further configured to determine the maximum transmit power for the selected one uplink component carrier by accounting for the second maximum transmit power being calculated independently of any increase in transmit power of other of the uplink component carriers.

61. The apparatus of claim 57, wherein the first power headroom information is based on a maximum transmit power for a first of the two or more uplink carriers, and the power headroom determination module is further configured to determine the maximum transmit power for a second of the two or more uplink component carriers based on a difference between a current transmit power of the first of the two or more uplink carriers and the first power headroom information.

62. The apparatus of claim 57, wherein the receiver module configured to receive a plurality of concurrently transmitted uplink component carriers.

63. A method for wireless communication in a multi carrier wireless communication system, comprising:

receiving a power headroom report (PHR) communication that comprises one or more of a first type of PHR and a second type of PHR, the first type of PHR comprising first power headroom information that is based on a first maximum transmit power associated with two or more uplink component carriers to be concurrently transmitted through a single power amplifier, and the second type of PHR comprising second power headroom information that is based on a second maximum transmit power associated with a selected one uplink component carrier transmitted through a single power amplifier;

determining which of the one or more of the first type and second type of PHR are included in the PHR communication; and

determining maximum transmit power for one or more to be concurrently transmitted uplink component carriers based on the PHR communication and the one or more types of PHR included in the PHR communication.

64. The method of claim 63, further comprising:

determining that the PHR communication includes the first type of PHR when the two or more uplink component carriers are in the same frequency band.

65. The method of claim 64, further comprising:

determining the maximum transmit power for the two or more uplink component carriers by accounting for the first maximum transmit power being calculated by proportionally increasing transmit powers for each of the plurality of uplink component carriers.

66. The method of claim 63, further comprising:

determining that the PHR communication includes the second type of PHR when the selected one uplink component carrier is in a frequency band that is different than the frequency band of other of the plurality of uplink component carriers.

67. The method of claim 64, wherein the first power headroom information is based on a maximum transmit power for a first of the two or more uplink carriers, and wherein determining the maximum transmit power comprises determining the maximum transmit power for a second of the two or more uplink component carriers based on a difference between a current transmit power of the first of the two or more uplink carriers and the first power headroom information.

68. A system for wireless communication in a multi carrier wireless communication system, comprising:

means for receiving a power headroom report (PHR) communication that comprises one or more of a first type of PHR and a second type of PHR, the first type of PHR comprising first power headroom information that is based on a first maximum transmit power associated with two or more uplink component carriers to be concurrently transmitted through a single power amplifier, and the second type of PHR comprising second power headroom information that is based on a second maximum transmit power associated with a selected one uplink component carrier transmitted through a single power amplifier;

means for determining which of the one or more of the first type and second type of PHR are included in the PHR communication; and

means for determining maximum transmit power for one or more to be concurrently transmitted uplink component carriers based on the PHR communication and the one or more types of PHR included in the PHR communication.

69. The system of claim 68, wherein the means for determining maximum transmit power comprises:

means for determining the maximum transmit power for the two or more uplink component carriers by accounting for the first maximum transmit power being calculated by proportionally increasing transmit powers for each of the plurality of uplink component carriers.

70. The system of claim 68, wherein the means for determining which of the one or more of the first type and second type of PHR are included in the PHR communication comprises:

means for determining that the PHR communication includes the second type of PHR when the selected one uplink component carrier is in a frequency band that is different than the frequency band of other of the plurality of uplink component carriers.

71. The computer program product for determining transmit power a multi carrier wireless communication system, comprising:

a non-transitory computer-readable medium comprising;

code for receiving a power headroom report (PHR) communication that comprises one or more of a first type of PHR and a second type of PHR, the first type of PHR comprising first power headroom information that is based on a first maximum transmit power associated with two or more uplink component carriers to be concurrently transmitted through a single power amplifier, and the second type of PHR comprising second power headroom information that is based on a second maximum transmit power associated with a selected one uplink component carrier transmitted through a single power amplifier;

code for determining which of the one or more of the first type and second type of PHR are included in the PHR communication; and

code for determining maximum transmit power for one or more to be concurrently transmitted uplink component carriers based on the PHR communication and the one or more types of PHR included in the PHR communication.

72. The computer program product of claim 71, wherein the non-transitory computer-readable medium further comprises:

code for determining that the PHR communication includes the first type of PHR when the two or more uplink component carriers are in the same frequency band, and determining that the PHR communication includes the second type of PHR when the selected one uplink component carrier is in a frequency band that is different than the frequency band of other of the plurality of uplink component carriers.

73. The computer program product of claim 71, wherein the non-transitory computer-readable medium further comprises:

code for determining the maximum transmit power for the two or more uplink component carriers by accounting for the first maximum transmit power being calculated by proportionally increasing transmit powers for each of the plurality of uplink component carriers.