Method and apparatus for adjusting transmission power of CDMA terminal

• US RE40,553 E1
• Filed: 04/22/2005
• Issued: 10/28/2008
• Est. Priority Date: 03/18/1998
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Ichihara, Masaki
• Primary Examiner(s): GESESSE, TILAHUN
• Application Number:
  US11/113,336
• Time in Patent Office: 1,285 Days
• Field of Search: 455/127.2, 455/116, 455/115.1, 455/123, 455/124, 455/125, 455/69, 455/522, 455/572, 370/342, 370/335
• US Class Current: 370/342
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/52 using AGC [Automatic Gain Control] circuits or amplifiers

Abstract

Variable gain circuits 16A and 16B are provided, respectively, on an output side of spreading circuits 15A and 15B disposed for each code channel, and after the outputs from the variable gain circuits 16A and 16B are added by adders 17 and 18, orthogonal modulation is applied to the outputs by a modulator 20, and a transmission signal is obtained. Furthermore, a variable gain circuit 22 for adjusting a level of the transmission signal is provided. An adjustment of average transmission power of the code channels is conducted by the variable again circuit 22, and an individual adjustment is conducted by the variable gain circuits 16A and 16B.

Claims

1. A method of adjusting transmission power in a CDMA terminal for code division multiple access communication in a spread spectrum system and transmitting information using a plurality of code channels, said method comprising the steps of:

generating base band signals and spreading data over a plurality of code channels, said data comprising in-phase components and orthogonal components of said base band signals;

adjusting the levels of said in-phase components and said orthogonal components for each of the plurality of code channels;

adding said in-phase component and said orthogonal components over said plurality of code channels;

modulating the signals after addition to generate a high frequency signal;

adjusting a level of said high frequency signal; and

sending said adjusted high frequency signal.

2. A method of adjusting transmission power in a CDMA terminal according to claim 1, wherein an adjustment in quantity of levels of said in-phase components and said orthogonal components and an adjustment in quantity of a level of said high frequency signal are determined based on a control signal from an other station.

3. A method of adjusting transmission power in a CDMA terminal according to claim 2, wherein levels of said in-phase components and said orthogonal components are not changed and only a level of said high frequency signal is changed when said control signal is for increasing or decreasing the levels by a constant quantity common to each of said code channels.

4. A method of adjusting transmission power in a CDMA terminal according to claim 1, wherein said step of adjusting the level of aid high frequency signal comprises adjusting a total average level of transmission signals of said code channels and adjusting the levels of said in-phase components and said orthogonal components for every code channel comprises adjusting a different of levels between said code channels.

5. A method of adjusting transmission power in a CDMA terminal according to claim 1, further comprising a step of determining a level difference between said in-phase components and said orthogonal components and the code channels in accordance with characteristic of data to be transmitted to each code channel, wherein the level for each code channel is adjusted in accordance with said determined level difference.

6. A method of adjusting transmission power in a CDMA terminal according to claim 1, wherein an adjustment of levels said in-phase components and said orthogonal components is not conducted for one specific code channel.

7. A method of adjusting transmission power in a CDMA terminal according to claim 1, wherein said CDMA terminal is a mobile station in a mobile communication system, and said other station is a base station.

8. A method of adjusting transmission power in a CDMA terminal according to claim 1, wherein said spread spectrum system is a direct sequence system.

25. A method of adjusting transmission power in a CDMA terminal according to claim 2, wherein an adjustment of levels said base band signals is not conducted for one specific code channel.

9. An apparatus for adjusting transmission power in a CDMA terminal for code division multiple access communication in a spread spectrum system transmitting information using a plurality of code channels, comprising:

a plurality of spreading means for each code channel for spreading data;

a plurality of first variable gain control means disposed for said each code channel for adjusting levels of output signals from said spreading means;

an adder for adding outputs from each of said first variable gain control means;

a modulator for modulating an output from said adder, and outputting a high frequency signal; and

second variable gain control means for adjusting a level of said high frequency signal.

10. The apparatus for adjusting transmission power in a CDMA terminal according to claim 9, furhter comprising a transmitter for sending an output signal from said second variable gain control means to an other station.

11. The apparatus for adjusting transmission power in a CDMA terminal according to claim 9, further comprising control means for determining a level adjustment in each of said first variable gain control means and said second variable gain control means based on a control signal from an other station.

12. The apparatus for adjusting transmission power in a CDMA terminal according to claim 11, wherein a total average level of transmission signals of said code channels is adjusted by said second variable gain control means, and a difference of levels between the code channels is adjusted by said first variable gain control means.

13. The apparatus for adjusting transmission power in a CDMA terminal according to claim 9, further comprising;

a level setting circuit for setting a level adjustment in quantity in each of said first variable gain control means based on a required level difference between said code channels and

control means for determining a level adjustment in quantity in said second variable gain control means based on a control signal from an other station.

14. The apparatus for adjusting transmission power in a CDMA terminal according to claim 13, wherein said required level difference is determined using insert of a transmission data in said each code channel.

15. The apparatus for adjusting transmission power in a CDMA terminal according to claim 9, wherein said first variable gain control means is not disposed in one specific code channel.

16. The apparatus for adjusting transmission power in a CDMA terminal according to claim 9, wherein each of said spreading circuits and each of said first variable gain control means are disposed in a digital signal processing circuit section, and said second variable gain control means is constructed as a high frequency analog circuit.

17. The apparatus for adjusting transmission power in a CDMA terminal according to claim 9, wherein said CDMA terminal is a mobile station in a mobile communication system, and an other station is a base station in said mobile communication system.

18. The apparatus for adjusting transmission power in a CDMA terminal according to claim 9, wherein said spread spectrum system is direct sequence system.

19. An apparatus for adjusting transmission power in a mobile station for code division multiple access communication with direct sequence system of spread spectrum system and transmitting information using a plurality of code channels, comprising:

a plurality of spreading means disposed for each code channel, said spreading means for spreading data;

a plurality of first variable gain control means disposed for said each code channel, said first variable gain control means for adjusting levels of output signals from said spreading means;

adder for adding outputs from each of said first variable gain control means;

modulator for modulating based on an output from said adder, and outputting a high frequency signal;

second variable gain control means for adjusting a level of said high frequency signal;

transmitter for sending an output signal from said second variable gain control means to the base station the other station; and

control means for determining a level adjustment in quantity in each of said first variable gain control means and said second variable gain control means based on a control signal from said other station.

20. The apparatus for adjusting transmission power in a CDMA terminal according to claim 19, wherein a total average level of transmission signals of said code channels is adjusted by said second variable gain control means, and a difference of levels between the code channels is adjusted by said first variable gain control means.

21. The apparatus for adjusting transmission power in a CDMA terminal according to claim 19, further comprising;

a level setting circuit for setting a level adjustment in each of said first variable gain control means based on a required level difference between said code channels and

control means for determining a level adjustment in said second variable gain control means based on a control signal from said other station.

22. The apparatus for adjusting transmission power in a CDMA terminal according to claim 19, wherein said required level difference is determined using information with respect to characteristic of a transmission data in each of code channels.

23. The apparatus for adjusting transmission power in a CDMA terminal according to claim 19, wherein said first variable gain control means is not disposed in one specific code channel.

24. The apparatus for adjusting transmission power in a CDMA terminal according to claim 19, wherein each of said spreading circuits and each of said first variable gain control means are disposed in a digital signal processing circuit section, and said second variable gain control means is a high frequency analog circuit.

26. A method of adjusting transmission power in a CDMA terminal for code division multiple access communication in a spread spectrum system transmitting information using a plurality of code channels, said method comprising:

generating base band signals by spreading data over every code channel;

adjusting the level differences of said base band signals between code channels;

adding said adjusted base band signals over said plurality of code channels;

modulating said signal after addition to generate a high frequency signal;

adjusting a total average level of said code channels and adjusting the levels of said high frequency signal; and

sending said adjusted high frequency signal to an other station.

27. A method of adjusting transmission power in a CDMA terminal according to claim 26, wherein an adjustment of said base band signal level for every code channel and an adjustment of said high frequency signal level are determined based on a control signal from said other station.

28. A method of adjusting transmission power in a CDMA terminal according to claim 27, wherein levels of said base band signals are not changed and only a level of said high frequency signal is changed when said control signal is for increasing or decreasing the levels by a constant common to each of said code channels.

29. A method of adjusting transmission power in a CDMA terminal according to claim 26, further comprising a step of determining a level difference of said band signals between the code channels in accordance with characteristic of data to be transmitted to each code channel, wherein a level for each code channel is adjusted in accordance with said determined level difference.

30. A method of adjusting transmission power in a CDMA terminal according to claim 26, wherein an adjustment of level said base band signals is not conducted for one specific code channel.

31. A method of adjusting transmission power in a CDMA terminal according to claim 26, wherein said CDMA terminal is a mobile station in a mobile communication system and said other station is a base station in said mobile communication system.

32. An apparatus of adjusting transmission power in a CDMA terminal for code division multiple access communication with spread spectrum system transmitting information using a plurality of code channels, comprising:

a plurality of spreading means for spreading data disposed for each code channel;

a plurality of first variable control means disposed for said each code channel, for adjusting output signal levels from said spreading means;

adders for adding outputs from each of said first variable gain control means;

modulator for modulating an output from said adder and outputting a high frequency signals;

second variable gain control means for adjusting a level of said high frequency signal; and

a control means for controlling said first variable gain control means and said second variable gain control means.

33. An apparatus for adjusting transmission power in a CDMA terminal according to claim 32, further comprising a transmitter for sending an output signal from said second variable gain control means.

34. An apparatus for adjusting transmission power in a CDMA terminal according to claim 33, further comprising control means for determining a level adjustment each of said first variable gain control means and said second variable gain control means based on a control signal from an other station.

35. An apparatus for adjusting transmission power in a CDMA terminal according to claim 32, further comprising;

level setting circuit for setting a level adjustment in each of said first variable gain control means based on a required level difference between said code channels and

control means for determining a level adjustment in said second variable gain control means based on a control signal from an other station.

36. An apparatus for adjusting transmission power in a CDMA terminal according to claim 35, comprising means for determining said required level difference based on transmission data in said each code channel.

37. An apparatus for adjusting transmission power in a CDMA terminal according to claim 32, wherein said first variable gain control means is omitted in one code channel.

38. An apparatus for adjusting transmission power in a CDMA terminal according to claim 32, wherein each of said spreading circuits and each of said first variable gain control means are disposed in a digital signal processing circuit section, and said second variable gain control means is constructed as a high frequency analog circuit.

39. An apparatus for adjusting transmission power in a CDMA terminal according to claim 32, wherein said CDMA terminal is a mobile station in a mobile communication system, and an other station is a base station in said mobile communication system.

40. An apparatus for adjusting transmission power in a CDMA terminal according to claim 32, wherein said spread spectrum system is direct sequence system.

41. An apparatus that adjusts transmission power in a CDMA mobile station for code division multiple access communication in a spread spectrum system transmitting information using a plurality of code channels, said apparatus comprising,

a plurality of spreading circuits that spread data over said code channels,

a plurality of first gain controllers that adjust level differences of outputs from said spreading circuits based on an error correcting method for said code channels,

an adder that adds outputs from said first gain controllers,

a modulator that modulates an output from said adder, and

a second gain controller that adjusts a level of an output signal from said modulator.

42. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 41, further comprising:

a transmitter that ends an output from said second gain controller to a base station.

43. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 42, further comprising:

a receiver that receives a control signal for said first gain controllers from said base station,

wherein said first gain controllers adjust level differences of outputs from said spreading circuits based on said control signal.

44. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 42, further comprising:

a receiver that receives a control signal for said second gain controller from said base station,

wherein said second gain controller adjusts level of said output signal from said modulator based on said control signal.

45. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 41, further comprising:

a receiver that receives a control signal for said first gain controllers from a base station,

wherein said first gain controllers adjust level differences of outputs from said spreading circuits based on said control signal.

46. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 41, further comprising:

a memory that stores a control signal for setting level differences of said code channels,

wherein said first gain controllers adjust level differences of outputs from said spreading circuits based on said control signal.

47. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 41, further comprising:

a receiver that receives a control signal for said second gain controller from a base station,

wherein said second gain controller adjusts level of said output signal from said modulator based on said control signal.

48. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 41, wherein said first gain controller adjust based on the information with respect to characteristic of each code channel.

49. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 41, wherein each of said spreading circuits and each of said first gain controllers are constructed as a digital circuit, and said second gain controller is constructed as an analog circuit.

50. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 41, wherein said second gain controller has a wider dynamic range than said first gain controllers.

51. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 41, further comprising:

a receiver that receives a first control signal and a second control signal from a base station,

wherein said first gain controllers are controlled based on said first control signal and said second gain controller is controlled based on said second control signal.

52. An apparatus that adjusts transmission power in a CDMA mobile station for code division multiple access communication in a spread spectrum system transmitting information using a plurality of code channels, said apparatus comprising:

spreading means that spreads data over said code channels,

first gain controlling means for adjusting level differences of outputs from said spreading means based on an error correcting method for said code channels,

adding means for adding outputs from said first gain controlling means,

modulating means for modulating an output from said adding means, and

second gain controlling means adjusting a level of an output signal from said modulating means.

53. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 52, further comprising:

transmitting means for sending an output from said second gain controlling means to a base station.

54. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 53, further comprising:

receiving means for receiving a control signal for said first gain controlling means from said base station,

wherein said first gain controlling means adjusts level differences of outputs from said spreading means based on said control signal.

55. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 53, further comprising:

receiving means for receiving a control signal for said second gain controlling means from said base station,

wherein said second gain controlling means adjust level of said output signal from said modulating means based on said control signal.

56. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 52, further comprising:

receiving means for receiving a control signal for said first gain controlling means from a base station,

wherein said first gain controlling means adjusts level differences of outputs from said spreading means based on said control signal.

57. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 52, further comprising:

storing means for storing a control signal for setting level differences of said code channels,

wherein said first gain controlling means adjusts level differences of outputs from said spreading means based on said control signal.

58. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 52, further comprising:

receiving means for receiving a control signal for said second gain controlling means from a base station,

wherein said second gain controlling means adjusts level of said output signal from said modulating means based on said control signal.

59. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 52, wherein said first gain controlling means adjusts based on the information with respect to characteristic of each code channel.

60. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 52, wherein each of said spreading means and each of said first gain controlling means are constructed as a digital circuit, and said second gain controlling means is constructed as an analog circuit.

61. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 52, wherein said second gain controlling means has a wider dynamic range than said first gain controlling means.

62. An apparatus that adjusts transmission power in a CDMA mobile station according to claim 52, further comprising:

receiving means for receiving a first control signal and a second control signal from a base station,

wherein said first gain controlling means is controlled based on said first control signal and said second gain controlling means is controlled based on said second control signal.

63. A method of adjusting transmission power in a CDMA mobile station for code division multiple access communication in a spread spectrum system transmitting information using a plurality of code channels, said method comprising:

generating base band signals by spreading data over code channels,

adjusting level differences of said base band signals based on an error correcting method for said code channels,

adding adjustment base band signals over said base band signals modulating added base band signals to generate a transmission signal,

adjusting level of said transmission signal, and

sending an adjusted transmission signal to a base station.

64. A method of adjusting transmission power in a CDMA mobile station according to claim 63, further comprising:

receiving a control signal from said base station,

wherein level differences of said base band signals are adjusted based on said control signal.

65. A method of adjusting transmission power in a CDMA mobile station according to claim 63, further comprising:

storing a control signal for setting level differences of said base band signals, wherein level differences of said base band signals are adjusted based on said control signal.

66. A method of adjusting transmission power in a CDMA mobile station according to claim 63, further comprising:

receiving a control signal from said base station,

wherein said transmission signal is adjusted based on said control signal.

67. A method of adjusting transmission power in a CDMA mobile station according to claim 63, wherein level differences of said base band signals are adjusted based on the information with respect to characteristic of each code channel.

68. A method of adjusting transmission power in a CDMA mobile station according to claim 63, wherein the dynamic range of said step of adjusting level of said transmission signal is wider than the dynamic range of said step of adjusting level differences of said base band signals.

69. A method of adjusting transmission power in a CDMA mobile station according to claim 63, further comprising:

receiving a first control signal and a second control signal from said base station

wherein level differences of said base band signals are adjusted based on said first control signal and the level of said transmission signal is adjusted based on said second control signal.

70. An apparatus that adjusts transmission power in a CDMA mobile station for a code division multiple access communication in a spread spectrum system over a plurality of channels, said apparatus comprising:

(a) a spreading circuit;

(b) a first gain controller disposed after said spreading circuit, said first gain controller adjusting a level of a first channel from among said plurality of channels, based on a level of a second channel from among said plurality of channels, different from said first channel, and based on an error correcting method for said first channel;

(c) an adder disposed after said first gain controller that adds signals on said first and second channels;

(d) a modulator that modulates an output from said adder; and

(e) a second gain controller that adjusts a level of output from said modulator.

71. An apparatus according to claim 70, wherein said first gain controller adjusts said level of said first channel based on a calculation relative to said level of said second channel.

72. An apparatus according to claim 70, further comprising:

a transmitter that sends an output from said second gain controller to a base station.

73. An apparatus according to claim 70, wherein said spreading circuit and said first gain controller are constructed as a digital circuit, and said second gain controller is constructed as an analog circuit.

74. An apparatus according to claim 70, wherein said second gain controller has a wider dynamic range than said first gain controller.

75. A method of adjusting transmission power in a CDMA mobile station for a code division multiple access communication in a spread spectrum system over a plurality of channels, said method comprising:

(a) spreading data over a channel;

(b) adjusting a level of a first channel from among the plurality of channels, based on a level of a second channel from among the plurality of channels, different from the first channel, and based on an error correcting method for said first channel;

(c) adding signals on the first and second channels;

(d) modulating the sum obtained in said adding step; and

(e) adjusting a level of output from said modulating step.

76. A method according to claim 75, wherein said step (b) adjusts the level of the first channel based on a calculation relative to the level of the second channel.

77. A method according to claim 75, further comprising:

sending an output from step (e) to a base station.

78. A method according to claim 75, wherein said steps (a) and (b) are performed by a digital circuit, and said step (e) is performed using an analog circuit.

79. A method according to claim 75, wherein said step (e) is performed with a wider dynamic range than said step (b).

80. An apparatus that adjusts transmission power in a CDMA mobile station for a code division multiple access communication in a spread spectrum system over a plurality of channels, said apparatus comprising:

(a) spreading means for spreading data over a channel;

(b) first gain control means disposed after said spreading means, said first gain control means for adjusting a level of a first channel from among said plurality of channels, based on a level of a second channel from among said plurality of channels, different from said first channel, and based on an error correcting method for said first channel;

(c) adding means disposed after said first gain control means for adding signals on said first and second channels;

(d) modulation means for modulating an output from said adding means; and

(e) second gain control means for adjusting a level of output from said modulation means.

81. An apparatus according to claim 80, wherein said first gain control means adjusts said level of said first channel based on a calculation relative to said level of said second channel.

82. An apparatus according to claim 80, further comprising:

transmitting means for sending an output from said second gain control means to a base station.

83. An apparatus according to claim 80, wherein said spreading means and said first gain control means are constructed as a digital circuit, and said second gain control means is constructed as an analog circuit.

84. An apparatus according to claim 80, wherein said second gain control means has a wider dynamic range than said first gain control means.

85. An apparatus that adjusts transmission power in a CDMA mobile station for code division multiple access communication in a spread spectrum system transmitting information using a plurality of code channels, said apparatus comprising:

a plurality of spreading circuits that spread data over said code channels;

a plurality of first gain controllers that adjust levels of outputs from said spreading circuits based on an error correcting method for said code channels;

an adder that adds outputs from said first gain controllers;

a modulator that modulates an output from said adder; and

a second gain controller that adjusts a level of an output from said modulator.

86. An apparatus according to claim 85, further comprising:

a transmitter that sends an output from said second gain controller to a base station.

87. An apparatus according to claim 85, wherein said spreading circuits and said first gain controllers are constructed as digital circuits, and said second gain controller is constructed as an analog circuit.

88. An apparatus according to claim 85, wherein said second gain controller has a wider dynamic range than said first gain controller.

89. An apparatus that adjusts transmission power in a CDMA mobile station for code division multiple access communication in a spread spectrum system transmitting information using a plurality of code channels, said apparatus comprising:

spreading means for spreading data over said code channels;

first gain controlling means for adjusting levels of outputs from said spreading means based on an error correcting method for said code channels;

adding means for adding outputs from said first gain controlling means;

modulating means for modulating an output from said adding means; and

second gain controlling means for adjusting a level of an output from said modulating means.

90. An apparatus according to claim 89, further comprising:

transmitting means that sends an output from said second gain controlling means to a base station.

91. An apparatus according to claim 89, wherein said spreading means and said first gain controlling means are constructed as digital circuits, and said second gain controlling means is constructed as an analog circuit.

92. An apparatus according to claim 89, wherein said second gain controlling means has a wider dynamic range than said first gain controlling means.

93. An method of adjusting transmission power in a CDMA mobile station for code division multiple access communication in a spread spectrum system transmitting information using a plurality of code channels, said method comprising:

generating base band signals by spreading data over said code channels;

adjusting levels of said base band signals based on an error correcting method for said code channels;

adding said adjusted base band signals;

modulating said added base band signals to generate a transmission signal;

adjusting a level of said transmission signal; and

sending said adjusted transmission signal to a base station.

94. A method of adjusting transmission power in a CDMA mobile station according to claim 93, further comprising:

receiving a control signal from said base station,

wherein level differences of said base band signals are adjusted based on said control signal.

95. A method of adjusting transmission power in a CDMA mobile station according to claim 93, further comprising:

storing a control signal for setting level differences of said base band signals, wherein level differences of said base band signals are adjusted based on said control signal.

96. A method of adjusting transmission power in a CDMA mobile station according to claim 93, furhter comprising:

receiving a control signal from said base station,

wherein said transmission signal is adjusted based on said control signal.

97. A method of adjusting transmission power in a CDMA mobile station according to claim 93, wherein level differences of said base band signals are adjusted based on the information with respect to characteristic of each code channel.

98. A method of adjusting transmission power in a CDMA mobile station according to claim 93, wherein the dynamic range of said step of adjusting level of said transmission signal is wider than the dynamic range of said step of adjusting level differences of said base band signals.

99. A method of adjusting transmission power in a CDMA mobile station according to claim 93, further comprising:

receiving a first control signal and a second control signal from said base station

wherein level differences of said base band signals are adjusted based on said first control signal and the level of said transmission signal is adjusted based on said second control signal.