CARRIER MANAGEMENT IN A WIRELESS COMMUNICATION DEVICE ASSIGNED A SET OF TWO OR MORE CARRIERS BY A WIRELESS COMMUNICATION NETWORK

• US 20090196196A1
• Filed: 01/29/2009
• Published: 08/06/2009
• Est. Priority Date: 02/01/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Garach, Ravindra, Attar, Rashid Ahmed Akbar, Hu, Jun, Ghosh, Donna, Lott, Christopher Gerard, Chen, Qingxin
• Granted Patent: US 8,553,712 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

Carrier management in a wireless communication device assigned a set of two or more carriers by a wireless communication network is disclosed. In one aspect, a method of carrier management includes transmitting data over the wireless communication network on one or more carriers forming a subset of active carriers from the set of carriers assigned to the wireless communication device. A first performance metric is determined indicative of operating conditions across the set of carriers assigned to the wireless communication device. A desired number of carriers on which to transmit data based on the first performance metric is determined. The desired number of carriers on which to transmit data is compared with the number of carriers in the subset of active carriers. The subset of active carriers is dynamically adjusted based on the comparison and subsequent data is transmitted over the wireless communication network using the adjusted subset of active carriers.

Claims

1. A method for carrier management in a wireless communication device assigned a set of two or more carriers by a wireless communication network, the method comprising:

transmitting data over the wireless communication network on one or more carriers forming a subset of active carriers from the set of carriers assigned to the wireless communication device;

determining a first performance metric indicative of operating conditions across the set of carriers assigned to the wireless communication device;

determining a desired number of carriers on which to transmit data based on the first performance metric;

comparing the desired number of carriers on which to transmit data with the number of carriers in the subset of active carriers;

dynamically adjusting the subset of active carriers based on the comparison; and

transmitting subsequent data over the wireless communication network using the adjusted subset of active carriers.

2. The method of claim 1, wherein the first performance metric indicates a long term average interference seen by the wireless communication device over the set of assigned carriers.

3. The method of claim 1, wherein the first performance metric indicates a total amount of data pending transmission at the wireless communication device.

4. The method of claim 1, wherein the first performance metric indicates a total transmit power used for transmitting data over the set of assigned carriers.

5. The method of claim 1, wherein the first performance metric is filtered over time to provide a time averaged-performance metric.

6. The method of claim 1, wherein determining the desired number of carriers on which to transmit data comprises comparing the first performance metric to one or more thresholds indicating a given number of carriers on which to transmit data.

7. The method of claim 6, wherein each threshold is set based on a minimum desired data rate for the corresponding number of carriers.

8. The method of claim 1, wherein dynamically adjusting the subset of active carriers comprises:

adding one carrier to the subset of active carriers if the desired number of carriers is greater than the number of carriers in the subset of active carriers; and

removing one carrier from the subset of active carriers if the desired number of carriers is less than the number of carriers in the subset of active carriers.

9. The method of claim 8, wherein the added or removed carrier is selected according to a prioritized listing of the carriers maintained by the wireless communication device.

10. The method of claim 9, wherein removing the selected carrier is postponed until any active data transmissions on the selected carrier have been completed.

11. The method of claim 1, further comprising:

maintaining overhead transmissions on carriers not used for transmitting data to keep them assigned to the wireless communication device by the wireless communication network.

12. The method of claim 1, further comprising:

determining a second performance metric indicative of operating conditions across the set of carriers assigned to the wireless communication device;

determining a desired number of carriers to maintain at the wireless communication device based on the second performance metric;

comparing the desired number of carriers to maintain with the number of carriers in the set of assigned carriers;

dynamically generating an add request message for transmission to the wireless communication network if the desired number of carriers to maintain is greater than the number of carriers in the set of assigned carriers; and

dynamically generating a drop request message for transmission to the wireless communication network if the desired number of carriers to maintain is less than the number of carriers in the set of assigned carriers.

13. The method of claim 12, wherein the second performance metric is the same as the first performance metric.

14. The method of claim 12, wherein the second performance metric is different from the first performance metric.

15. The method of claim 12, wherein determining the desired number of carriers to maintain comprises comparing the second performance metric to one or more thresholds indicating a given number of carriers to maintain.

16. The method of claim 15, wherein each threshold is set based on a minimum desired data rate for the corresponding number of carriers.

17. The method of claim 12, wherein the drop request message requests that the wireless communication network drop a carrier selected according to a prioritized listing of the carriers maintained by the wireless communication device.

18. The method of claim 17, wherein dynamically generating the drop request messages is postponed until any active data transmissions on the selected carrier have been completed.

19. The method of claim 12, wherein dynamically generating the add or drop request messages are spaced apart by at least a minimum amount of time configurable by the wireless communication device.

20. The method of claim 12, wherein the second performance metric is filtered over time to provide a time-averaged performance metric.

21. A wireless communication device for communicating with a wireless communication network over an assigned set of two or more carriers, the wireless communication device comprising:

logic configured to transmit data over the wireless communication network on one or more carriers forming a subset of active carriers from the set of carriers assigned to the wireless communication device;

logic configured to determine a first performance metric indicative of operating conditions across the set of carriers assigned to the wireless communication device;

logic configured to determine a desired number of carriers on which to transmit data based on the first performance metric;

logic configured to compare the desired number of carriers on which to transmit data with the number of carriers in the subset of active carriers;

logic configured to dynamically adjust the subset of active carriers based on the comparison; and

logic configured to transmit subsequent data over the wireless communication network using the adjusted subset of active carriers.

22. The wireless communication device of claim 21, wherein the first performance metric indicates a long term average interference seen by the wireless communication device over the set of assigned carriers.

23. The wireless communication device of claim 21, wherein the first performance metric indicates a total amount of data pending transmission at the wireless communication device.

24. The wireless communication device of claim 21, wherein the first performance metric indicates a total transmit power used for transmitting data over the set of assigned carriers.

25. The wireless communication device of claim 21, wherein the first performance metric is filtered over time to provide a time averaged-performance metric.

26. The wireless communication device of claim 21, wherein the logic configured to determine the desired number of carriers on which to transmit data comprises logic configured to compare the first performance metric to one or more thresholds indicating a given number of carriers on which to transmit data.

27. The wireless communication device of claim 26, wherein each threshold is set based on a minimum desired data rate for the corresponding number of carriers.

28. The wireless communication device of claim 21, wherein the logic configured to dynamically adjust the subset of active carriers comprises:

logic configured to add one carrier to the subset of active carriers if the desired number of carriers is greater than the number of carriers in the subset of active carriers; and

logic configured to remove one carrier from the subset of active carriers if the desired number of carriers is less than the number of carriers in the subset of active carriers.

29. The wireless communication device of claim 28, wherein the added or removed carrier is selected according to a prioritized listing of the carriers maintained by the wireless communication device.

30. The wireless communication device of claim 29, wherein removing the selected carrier is postponed until any active data transmissions on the selected carrier have been completed.

31. The wireless communication device of claim 21, further comprising:

logic configured to maintain overhead transmissions on carriers not used for transmitting data to keep them assigned to the wireless communication device by the wireless communication network.

32. The wireless communication device of claim 21, further comprising:

logic configured to determine a second performance metric indicative of operating conditions across the set of carriers assigned to the wireless communication device;

logic configured to determine a desired number of carriers to maintain at the wireless communication device based on the second performance metric;

logic configured to compare the desired number of carriers to maintain with the number of carriers in the set of assigned carriers;

logic configured to dynamically generate an add request message for transmission to the wireless communication network if the desired number of carriers to maintain is greater than the number of carriers in the set of assigned carriers; and

logic configured to dynamically generate a drop request message for transmission to the wireless communication network if the desired number of carriers to maintain is less than the number of carriers in the set of assigned carriers.

33. The wireless communication device of claim 32, wherein the second performance metric is the same as the first performance metric.

34. The wireless communication device of claim 32, wherein the second performance metric is different from the first performance metric.

35. The wireless communication device of claim 32, wherein the logic configured to determine the desired number of carriers to maintain comprises logic configured to compare the second performance metric to one or more thresholds indicating a given number of carriers to maintain.

36. The wireless communication device of claim 35, wherein each threshold is set based on a minimum desired data rate for the corresponding number of carriers.

37. The wireless communication device of claim 32, wherein the drop request message requests that the wireless communication network drop a carrier selected according to a prioritized listing of the carriers maintained by the wireless communication device.

38. The wireless communication device of claim 37, wherein dynamically generating the drop request messages is postponed until any active data transmissions on the selected carrier have been completed.

39. The wireless communication device of claim 32, wherein dynamically generating the add or drop request messages are spaced apart by at least a minimum amount of time configurable by the wireless communication device.

40. The wireless communication device of claim 32, wherein the second performance metric is filtered over time to provide a time-averaged performance metric.

41. A wireless communication device for communicating with a wireless communication network over an assigned set of two or more carriers, the wireless communication device comprising:

means for transmitting data over the wireless communication network on one or more carriers forming a subset of active carriers from the set of carriers assigned to the wireless communication device;

means for determining a first performance metric indicative of operating conditions across the set of carriers assigned to the wireless communication device;

means for determining a desired number of carriers on which to transmit data based on the first performance metric;

means for comparing the desired number of carriers on which to transmit data with the number of carriers in the subset of active carriers;

means for dynamically adjusting the subset of active carriers based on the comparison; and

means for transmitting subsequent data over the wireless communication network using the adjusted subset of active carriers.

42. The wireless communication device of claim 41, wherein the first performance metric indicates a long term average interference seen by the wireless communication device over the set of assigned carriers.

43. The wireless communication device of claim 41, wherein the first performance metric indicates a total amount of data pending transmission at the wireless communication device.

44. The wireless communication device of claim 41, wherein the first performance metric indicates a total transmit power used for transmitting data over the set of assigned carriers.

45. The wireless communication device of claim 41, wherein the first performance metric is filtered over time to provide a time averaged-performance metric.

46. The wireless communication device of claim 41, wherein the means for determining the desired number of carriers on which to transmit data comprises logic configured to compare the first performance metric to one or more thresholds indicating a given number of carriers on which to transmit data.

47. The wireless communication device of claim 46, wherein each threshold is set based on a minimum desired data rate for the corresponding number of carriers.

48. The wireless communication device of claim 41, wherein the means for dynamically adjusting the subset of active carriers comprises:

means for adding one carrier to the subset of active carriers if the desired number of carriers is greater than the number of carriers in the subset of active carriers; and

means for removing one carrier from the subset of active carriers if the desired number of carriers is less than the number of carriers in the subset of active carriers.

49. The wireless communication device of claim 48, wherein the added or removed carrier is selected according to a prioritized listing of the carriers maintained by the wireless communication device.

50. The wireless communication device of claim 49, wherein removing the selected carrier is postponed until any active data transmissions on the selected carrier have been completed.

51. The wireless communication device of claim 41, further comprising:

means for maintaining overhead transmissions on carriers not used for transmitting data to keep them assigned to the wireless communication device by the wireless communication network.

52. The wireless communication device of claim 41, further comprising:

means for determining a second performance metric indicative of operating conditions across the set of carriers assigned to the wireless communication device;

means for determining a desired number of carriers to maintain at the wireless communication device based on the second performance metric;

means for comparing the desired number of carriers to maintain with the number of carriers in the set of assigned carriers;

means for dynamically generating an add request message for transmission to the wireless communication network if the desired number of carriers to maintain is greater than the number of carriers in the set of assigned carriers; and

means for dynamically generating a drop request message for transmission to the wireless communication network if the desired number of carriers to maintain is less than the number of carriers in the set of assigned carriers.

53. The wireless communication device of claim 52, wherein the second performance metric is the same as the first performance metric.

54. The wireless communication device of claim 52, wherein the second performance metric is different from the first performance metric.

55. The wireless communication device of claim 52, wherein the means for determining the desired number of carriers to maintain comprises means for comparing the second performance metric to one or more thresholds indicating a given number of carriers to maintain.

56. The wireless communication device of claim 55, wherein each threshold is set based on a minimum desired data rate for the corresponding number of carriers.

57. The wireless communication device of claim 52, wherein the drop request message requests that the wireless communication network drop a carrier selected according to a prioritized listing of the carriers maintained by the wireless communication device.

58. The wireless communication device of claim 57, wherein dynamically generating the drop request messages is postponed until any active data transmissions on the selected carrier have been completed.

59. The wireless communication device of claim 52, wherein dynamically generating the add or drop request messages are spaced apart by at least a minimum amount of time configurable by the wireless communication device.

60. The wireless communication device of claim 52, wherein the second performance metric is filtered over time to provide a time-averaged performance metric.

61. A computer readable medium comprising code, which, when executed by a processor, causes the processor to perform operations for carrier management in a wireless communication device assigned a set of two or more carriers by a wireless communication network, the computer readable medium comprising:

code for transmitting data over the wireless communication network on one or more carriers forming a subset of active carriers from the set of carriers assigned to the wireless communication device;

code for determining a first performance metric indicative of operating conditions across the set of carriers assigned to the wireless communication device;

code for determining a desired number of carriers on which to transmit data based on the first performance metric;

code for comparing the desired number of carriers on which to transmit data with the number of carriers in the subset of active carriers;

code for dynamically adjusting the subset of active carriers based on the comparison; and

code for transmitting subsequent data over the wireless communication network using the adjusted subset of active carriers.

62. The computer readable medium of claim 61, wherein the first performance metric indicates a long term average interference seen by the wireless communication device over the set of assigned carriers.

63. The computer readable medium of claim 61, wherein the first performance metric indicates a total amount of data pending transmission at the wireless communication device.

64. The computer readable medium of claim 61, wherein the first performance metric indicates a total transmit power used for transmitting data over the set of assigned carriers.

65. The computer readable medium of claim 61, wherein the first performance metric is filtered over time to provide a time averaged-performance metric.

66. The computer readable medium of claim 61, wherein the code for determining the desired number of carriers on which to transmit data comprises logic configured to compare the first performance metric to one or more thresholds indicating a given number of carriers on which to transmit data.

67. The computer readable medium of claim 66, wherein each threshold is set based on a minimum desired data rate for the corresponding number of carriers.

68. The computer readable medium of claim 61, wherein the code for dynamically adjusting the subset of active carriers comprises:

code for adding one carrier to the subset of active carriers if the desired number of carriers is greater than the number of carriers in the subset of active carriers; and

code for removing one carrier from the subset of active carriers if the desired number of carriers is less than the number of carriers in the subset of active carriers.

69. The computer readable medium of claim 68, wherein the added or removed carrier is selected according to a prioritized listing of the carriers maintained by the wireless communication device.

70. The computer readable medium of claim 69, wherein removing the selected carrier is postponed until any active data transmissions on the selected carrier have been completed.

71. The computer readable medium of claim 61, further comprising:

code for maintaining overhead transmissions on carriers not used for transmitting data to keep them assigned to the wireless communication device by the wireless communication network.

72. The computer readable medium of claim 61, further comprising:

code for determining a second performance metric indicative of operating conditions across the set of carriers assigned to the wireless communication device;

code for determining a desired number of carriers to maintain at the wireless communication device based on the second performance metric;

code for comparing the desired number of carriers to maintain with the number of carriers in the set of assigned carriers;

code for dynamically generating an add request message for transmission to the wireless communication network if the desired number of carriers to maintain is greater than the number of carriers in the set of assigned carriers; and

code for dynamically generating a drop request message for transmission to the wireless communication network if the desired number of carriers to maintain is less than the number of carriers in the set of assigned carriers.

73. The computer readable medium of claim 72, wherein the second performance metric is the same as the first performance metric.

74. The computer readable medium of claim 72, wherein the second performance metric is different from the first performance metric.

75. The computer readable medium of claim 72, wherein the code for determining the desired number of carriers to maintain comprises code for comparing the second performance metric to one or more thresholds indicating a given number of carriers to maintain.

76. The computer readable medium of claim 75, wherein each threshold is set based on a minimum desired data rate for the corresponding number of carriers.

77. The computer readable medium of claim 72, wherein the drop request message requests that the wireless communication network drop a carrier selected according to a prioritized listing of the carriers maintained by the wireless communication device.

78. The computer readable medium of claim 77, wherein dynamically generating the drop request messages is postponed until any active data transmissions on the selected carrier have been completed.

79. The computer readable medium of claim 72, wherein dynamically generating the add or drop request messages are spaced apart by at least a minimum amount of time configurable by the wireless communication device.

80. The computer readable medium of claim 72, wherein the second performance metric is filtered over time to provide a time-averaged performance metric.