Selective power control messaging

• US 7,257,101 B2
• Filed: 09/30/2002
• Issued: 08/14/2007
• Est. Priority Date: 07/03/2002
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: ArrayComm LLC (Ygomi LLC)
• Inventors: Petrus, Paul, Sankaran, Sundar G.
• Primary Examiner(s): HO, DUC CHI
• Application Number:
  US10/262,316
• Publication Number:
  US 20040004944A1
• Time in Patent Office: 1,779 Days
• Field of Search: None
• US Class Current: 370/332
• CPC Class Codes: H04W 52/36 with a discrete range or set of values, e.g. step size, ramping or offsets
• CPC Class Codes: H04W 52/58 Format of the TPC bits

Abstract

According to an embodiment of the invention, a method and apparatus are described to receive a signal, determine a quality of the received signal, and transmit a power control message, with a selected size, the power control message being based at least in part on the quality of the received signal. The power control message requests a modification in transmission power or indicates the deviation of the signal quality from a reference signal quality.

Claims

1. A method comprising:

receiving a signal;

determining a quality of the received signal, the quality of the signal being compared to a reference quality; and

transmitting a power control message, with a selected size, the power control message being based at least in part on the quality of the received signal;

the power control message including a request for a modification in transmission power for a power control message transmitted by a first device and including an indication of a deviation of the quality of the received signal from the reference quality for a power control message transmitted by a second device.

2. The method of claim 1, wherein the first device is a base station and the second device is a remote terminal.

3. The method of claim 1, wherein the power control message comprises a basic power control message and an optional extended power control message.

4. The method of claim 3, wherein the power control message requests a modification in transmission power and wherein the basic power control message comprises one of a request to increase transmission power by a predetermined amount or a request to decrease transmission power by a predetermined amount.

5. Tbe method of claim 4, wherein the extended power control message compnses a request to increase or decrease transmission power by an amount specified by the extended power control message.

6. The method of claim 3, wherein the power control message indicates a deviation in the quality of the received signal from the reference quality and wherein the basic power control message comprises one of an indication that the signal quality is above the reference signal quality by a predetermined amount or an indication that the signal quality is below the reference signal quality by a predetermined amount.

7. The method of claim 6, wherein the extended power control message comprises an indication that the signal quality is above or below the reference signal quality by an amount specified by the extended power control message.

8. The method of claim 3, wherein determining the quality of the received signal includes determining the signal to interference plus noise ratio of the received signal.

9. The method of claim 3, wherein the extended power control message is included if the basic power control message is not sufficient.

10. The method of claim 9, wherein the extended power control message is included if the quality of the received signal is above a certain upper quality threshold or below a certain lower quality threshold.

11. The method of claim 9, wherein the extended power control message is sent if signal quality remains above a certain upper quality threshold or below a certain lower quality threshold for a certain number of consecutive bursts of data.

12. The method of claim 9, further comprising determining a time averaged signal quality for the received signal, wherein the extended power control message is included if the time averaged signal quality is above a certain upper quality threshold or below a certain lower quality threshold.

13. The method of claim 9, further comprising suppressing transmission of additional extended power control messages for a certain period after an extended power control message is transmitted.

14. The method of claim 13, wherein the period is a period that is sufficient to allow adjustment of the transmission power level in response to the transmitted extended power control message.

15. The method of claim 9, further comprising suppressing transmission of additional extended power control messages if the quality of the received signal remains outside a specified range after the transmission of a specified number of extended power control messages.

16. The method of claim 9, further comprising including to extended power control message in all power control requests for a data format comprising a large number of data bits.

17. The method of claim 9, further comprising suppressing transmission of extended power control messages for all power control requests if the received signal comprises a small number of data bits.

18. The method of claim 3, wherein the basic power control message comprises one bit of data.

19. The method of claim 3, wherein the extended power control message comprises a plurality of bits of data.

20. The method of claim 3, wherein the basic power control message is transmitted via a dedicated control channel.

21. The method of claim 20, wherein the dedicated control channel comprises a signal header.

22. The method of claim 3, wherein the extended power control message is transmitted via a shared control channel.

23. The method of claim 22, wherein the shared control channel comprises a data payload of a signal.

24. A method comprising:

transmitting a signal;

receiving a power control message, of a selected size, the power control message being based at least in part on a quality of the signal; and

adjusting transmission power based at least in part on the received power control message;

the power control message including a request for a modification in transmission power for a power control message received by a second device, and including an indication that the transmitted signal deviates from a reference signal quality for a power control message rceived by a first device.

25. The method of claim 24, wherein the first device is a base station and the second device is a remote terminal.

26. The method of claim 24, wherein the received power control message comprises a basic power control message and an optional extended power control message.

27. The method of claim 26, wherein the power control message requests a modification in transmission power, end wherein the basic power control message comprises one of a request to increase the transmission power level by a predetermined amount or a request to decrease the transmission power level by a predetermined amount.

28. The method of claim 27, wherein the extended power control message comprises a request to increase or decrease the transmission power level by an amount specified by the extended power control message.

29. The method of claim 26, wherein the power control message indicates a deviation of the quality of the signal from the reference signal quality.

30. The method of claim 29, wherein the power control signal includes an indication that the transmitted signal deviates from a reference signal quality and wherein the basic power control message comprises one of an indication that the signal quality is above the reference signal quality by a predetermined amount or an indication that the signal quality is below the reference signal quality by a predetermined amount.

31. The method of claim 30, wherein the extended power control message comprises an indication that the signal quality is above or below the reference signal quality by an amount specified by the extended power control message.

32. The method of claim 26, further comprising ignoring the basic power control message if the extended power control message is received.

33. The method of claim 26, further comprising interpreting the basic power control message with the extended power control message if the extended power control message is received.

34. The method of claim 33, wherein the basic power control message is used to express the sign of the power control message if the extended power control message is received.

35. The method of claim 33, wherein the basic power control message and the extended power control message are interpreted together as a single message if the extended power control message is received.

36. The method of claim 26, wherein the basic power control message comprises one bit of data.

37. The method of claim 26, wherein the extended power control message comprises a plurality of bits of data.

38. The method of claim 26, wherein the basic power control message is received via a dedicated control channel.

39. The method of claim 38, wherein the dedicated control channel comprises a signal header.

40. The method of claim 26, wherein the extended power control message is received via a shared control channel.

41. The method of claim 40, wherein the shared control channel is a data payload of a signal.

42. A method comprising:

transmitting a signal, the signal including;

an optional extended power control message, the extended power control message including a request that the transmission power level be increased or decreased by an amount specified by the extended power control message if the signal is sent by a first device and includes an indication that a signal quality is above or below a target signal quality by an amount specified by the extended power control message if the signal is sent by a second device; and

a standard power control message, the standard power control message if the extended power control message is not included in the signal, including a request that a transmission power level be increased or decreased by a predetermined amount if the signal is sent by the first device and includes an indication that the signal quality is above or below the target signal quality by a predetermined amount if the signal is sent by the second device.

43. The method of claim 42, wherein the standard power control message is ignored if the extended power control message is included in the signal.

44. The method of claim 42, the standard power control message is interpreted with the extended power control message if the extended power control message is included in the signal.

45. The method of claim 44, wherein the standard power control message is used to express the sign of data contained in the extended power control message if the extended power control message is included in the signal.

46. The method of claim 44, wherein the standard power control message and the extended power control message are interpreted together as a single message if the extended power control message is included in the signal.

47. The method of claim 42, wherein the standard power control message is contained in a header of the signal.

48. The method of claim 42, wherein the extended power control message is contained in a data payload of the signal.

49. The method of claim 42, wherein the standard power control message comprises one bit of data.

50. The method of claim 42, wherein the extended power control message comprises a plurality of bits of data.

51. The method of claim 42, wherein the first device is a base station.

52. The method the claim 42, wherein the second device is a remote terminal.

53. A radio unit comprising:

a receiver to receive a first signal, the radio unit determining a quality of the first signal; and

a transmitter to transmit a second signal, the second signal including a power control message of selectable size related to a modification in transmission power, the power control message being based at least in part on the quality of the first signal, the power control message including a request for a modification in transmission power if the radio unit is a first type of radio and the power control unit including an indication of a deviation of the quality of the first sianal from a reference signal quality if the radio unit is a second type of radio.

54. The radio unit of claim 53, ivherein the power control message comprises a basic power control message and an optional extended power control message.

55. The radio unit of claim 54, wherein determining a quality of the first signal includes comparing the quality of the first signal to the reference signal quality.

56. The radio unit of claim 55, wherein determining a quality of the first signal includes determining the signal to interference plus noise ratio of the first signal.

57. The radio unit of claim 55, wherein the basic power control message comprises one of a request to increase transmission power by a predetermined amount or a request to decrease transmission power by a predetermined amount.

58. The radio unit of claim 55, wherein the basic power control message comprises one of an indication that the quality of the first signal is above the reference signal quality by a predetermined amount or an indication that the quality of the first signal is below the reference signal quality by a predetermined amount.

59. The radio unit of claim 55, wherein the extended power control message comprises a request to increase or decrease transmission power by an amount specified by the extended power control message.

60. The radio unit of claim 55, wherein the extended power control message comprises an indication that the quality of the first signal is above or below the reference signal quality by an amount specified by the extended power control message.

61. The radio unit of claim 55, wherein the radio unit includes the extended power control message in the power control message if the basic power control message is not sufficient.

62. The radio unit of claim 61, wherein the radio unit includes the extended power control message in the power control message if the quality of the received signal is above a certain upper quality threshold or below a certain lower quality threshold.

63. The radio unit of claim 55, wherein the basic power control message comprises one bit of data.

64. The radio unit of claim 55, wherein the extended power control message comprises a plurality of bits of data.

65. The radio unit of claim 55, wherein the radio unit transmits the basic power control message via a dedicated control channel.

66. The radio unit of claim 65, wherein the dedicated control channel comprises a signal header of the second signal.

67. The radio unit of claim 55, wherein the radio unit transmits the extended power control message via a shared control channel.

68. The radio unit of claim 67, wherein the shared control channel comprises a data payload of the second signal.

69. The radio unit of claim 53, wherein the first type of radio is a base station and the second type of radio is a remote terminal.

70. A radio unit comprising:

a transmitter to transmit a first signal; and

a receiver to receive a second signal, the second signal including a power control message of selectable size, the power control message being based at least in part on a quality of the first signal in comparison with a reference quality, the radio unit adjusting transmission power of the transmitter in response to the power control message;

the power control message including a request for a modification in transmission power if the radio unit is a first type of radio and the power control message including an indication of a deviation of the quality of the first siunal from the reference quality if the radio unit is a second type of radio.

71. The radio unit of claim 70, wherein the received power control message comprises a basic power control message and an optional extended power control message.

72. The radio unit of claim 71, wherein the radio unit ignores the basic power control message if the extended power control message is received.

73. The radio unit of claim 71, wherein the radio unit interprets the basic power control message with the extended power control message if the extended power control message is received.

74. The radio unit of claim 73, wherein the basic power control message is used to express the sign of the power control message if the extended power control message is received.

75. The radio unit of claim 73, wherein the basic power control message and the extended power control message are interpreted together as a single message if the extended power control message is received.

76. The radio unit of claim 71, wherein the basic power control message comprises one of a request to increase the transmission power level by a predetermined amount or a request to decrease the transmission power level by a predetermined amount.

77. The radio unit of claim 71, wherein the basic power control message comprises one of an indication that the quality of the first signal is above the reference quality by a predetermined amount or an indication that the quality of the first signal is below the reference quality by a predetermined amount.

78. The radio unit of claim 71, wherein the extended power control message comprises a request to increase or decrease the transmission power level by an amount specified by the extended power control message.

79. The radio unit of claim 71, wherein the extended power control message comprises an indication that the quality of the first signal is above or below the reference signal quality by an amount specified by the extended power control message.

80. The radio unit of claim 71, wherein the basic power control message comprises one bit of data.

81. The radio unit of claim 71, wherein the extended power control message comprises a plurality of bits of data.

82. The radio unit of claim 71, wherein the radio unit receives the basic power control message via a dedicated control channel.

83. The radio unit of claim 82, wherein the dedicated control channel comprises a signal header of the second signal.

84. The radio unit of claim 71, wherein the radio unit receives the extended power control message via a shared control channel.

85. The radio unit of claim 84, wherein the shared control channel is a data payload of the second signal.

86. The radio unit of claim 70, wherein the first type of radio is a remote terminal and the second type of radio is a base station.