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1. WO1996038938 - APPARATUS AND METHOD OF CONTROLLING TRANSMITTING POWER AND TRANSMIT RATE OF A WIRELESS TELECOMMUNICATIONS SYSTEM

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[ EN ]

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WHAT IS CLAIMED IS:
1. A subscriber terminal located at a fixed distance from a central terminal, comprising:
a spreader operable to receive user traffic and control information, the spreader operable in an acquisition mode to generate a first signal representing control information, the spreader operable in a traffic mode to generate a second signal representing control information and user traffic; and
a converter coupled to the spreader, the converter operable to convert one of the first signal and the second signal into a transmission signal for communication to the central terminal .

2. The subscriber terminal of Claim 1, wherein the spreader generates the first signal at a first rate and the second signal at a second rate greater than the first rate .

3. The subscriber terminal of Claim 1, further comprising:
an amplifier coupled to the converter and operable to amplify the transmission signal; and
an antenna coupled to the amplifier and operable to transmit the transmission signal.

4. The subscriber terminal of Claim 1, further comprising an amplifier coupled to the converter and operable to amplify the transmission signal at a selected one of a first power and a second power less than the first power.

5. The subscriber terminal of Claim 1, further comprising an amplifier coupled to the converter and operable to amplify the transmission signal at a selected one of a first power and a second power less than the first power, wherein the first power corresponds to the acquisition mode of the subscriber terminal.

6. The subscriber terminal of Claim 1, further comprising an amplifier coupled to the converter and operable to amplify the transmission signal at a selected one of a first power and a second power less than the first power, wherein the second power corresponds to a standby mode of the subscriber terminal.

7. The subscriber terminal of Claim 1, further comprising a telephone operable to generate user traffic.

8. A method for wireless telephone communication between fixed locations, comprising:
transmitting control information at a first rate;
detecting a request for user traffic;
transmitting control information and user traffic at a second rate greater than the first rate in response to the request for user traffic.

9. The method of Claim 8, further comprising the following steps performed before transmitting control information:
receiving control information at a first rate; and establishing a receive communication path.

10. The method of Claim 8, further comprising the following steps performed before transmitting control information:
receiving control information at a first rate and a first power;
establishing a receive communication path; and
receiving control information at a first rate and a second power upon establishing the receive communication path, the second power being less than the first power.

11. The method of Claim 8, wherein the step of transmitting control information comprises:
transmitting control information at a first rate and a first power to establish a transmit communication path; and
transmitting control information at a first rate and a second power upon establishing the transmit communication path, the second power being less than the first power.

12. The method of Claim 8, wherein the step of transmitting control information comprises combining, control information with a code sequence.

13. The method of Claim 8 , wherein the step of transmitting control information comprises combining control information with a code sequence, wherein the code sequence comprises a combination of a pseudo-random noise code and an orthogonal code.

14. The method of Claim 8, wherein the step of detecting a request comprises receiving a message from a remote device indicating a request for user traffic.

15. The method of Claim 8, wherein the step of transmitting control information and user traffic comprises combining control information and user traffic with a code sequence .

16. The method of Claim 8, wherein the step of transmitting control information and user traffic comprises combining control information and user traffic with a code sequence, wherein the code sequence comprises a combination of a pseudo-random noise code and an orthogonal code.

17. The method of Claim 8, further comprising the following steps performed after transmitting control information and user traffic:
receiving an indication of call termination; and
transmitting control information at the first rate in response to the indication of call termination.

18. The method of Claim 8, further comprising the following steps performed after transmitting control information and user traffic:
transmitting an indication of call termination; and transmitting control information at the first rate.

19. A central terminal, comprising:
a plurality of modem cards, each modem card operable to receive user traffic and control information associated with at least one of a plurality of subscriber terminals located at a fixed distance from the central terminal, each modem card operable in an acquisition mode to generate a first signal representing control information, each modem card operable in a traffic mode to generate a second signal representing control information and user traffic; and an analogue card coupled to the modem cards, the analogue card operable to generate a summed signal representing one of the first signal and the second signal generated by each of the modem cards.

20. The central terminal of Claim 19, further comprising a tributary unit coupled to the modem cards, the tributary unit operable to communicate user traffic between the modem cards and a public switched telephone network.

21. The central terminal of Claim 19, wherein each modem card generates the first signal at a first rate and the second signal at a second rate greater than the first rate.

22. The central terminal of Claim 19, further comprising:
an amplifier coupled to the analogue card and operable to amplify the summed signal; and
an antenna coupled to the amplifier and operable to transmit the summed signal to the subscriber terminals.

23. The central terminal of Claim 19, wherein the analogue card is operable to amplify one of the first signal and second signal generated by each of the modem cards at a selected one of a first power and a second power, before generating the summed signal.

24. The central terminal of Claim 19, wherein the analogue card is operable to amplify one of the first signal and the second signal generated by each of the modem cards at a selected one of a first power and a second power less than the first power, wherein the first power corresponds to the acquisition mode of the subscriber terminal.

25. The central terminal of Claim 19, wherein the analogue card is operable to amplify one of the first signal and the second signal generated by each of the modem cards at a selected one of a first power and a second power less than the first power, wherein the second power corresponds to a standby mode of the subscriber terminal .

26. A method for wireless telephone communication between a central terminal and a plurality of subscriber terminals located at a fixed distance from the central terminal, the method comprising the following steps performed at the central terminal :
receiving a plurality of signals associated with the subscriber terminals;
spreading each signal to generate a plurality of spread signals;
combining the spread signals into a combined signal; and
transmitting the combined signal to the subscriber terminals .

27. The method of Claim 26, wherein each signal comprises user traffic and control information.

28. The method of Claim 26, wherein the step of receiving a plurality of signals comprises receiving at least a portion of the signals from a public switched telephone network.

29. The method of Claim 26, wherein the step of spreading each signal comprises :
spreading each signal at a first rate if the signal represents control information; and
spreading each signal at a second rate greater than the first rate if the signal represents control information and user traffic.

30. The method of Claim 29, wherein the first rate corresponds to an acquisition mode and the second rate corresponds to a traffic mode.

31. The method of Claim 29, further comprising the step of amplifying each spread signal at one of a first power and a second power less than the first power.

32. The method of Claim 29, further comprising the step of amplifying each spread signal at one of a first power and a second power less than the first power, the first power corresponding to an acquisition mode and the second power corresponding to a standby mode.

33. The method of Claim 29, wherein the step of spreading each signal comprises combining the signal with a code sequence.

34. The method of Claim 29, wherein the step of spreading each signal comprises combining the signal with a code sequence, wherein the code sequence comprises a combination of a pseudo-random noise code and an orthogonal code.

35. A wireless receiver, comprising:
an antenna operable to receive a downlink signal from a remote device located at a fixed distance from the wireless receiver;
a converter coupled to the antenna and operable to convert a downlink signal into digital form; and
a despreader coupled to the converter, the despreader operable in an acquisition mode and at a first rate to despread control information in the downlink signal, the despreader operable in a traffic mode and at a second rate to despread control information and user traffic in the downlink signal.

36. The wireless receiver of Claim 35, wherein the downlink signal received at the despreader comprises in-phase and quadrature components .

37. The wireless receiver of Claim 35, wherein the control information comprises :
a code synchronization signal; and
a power control signal.

38. The wireless receiver of Claim 35, wherein the downlink signal received at the despreader comprises in-phase and quadrature components, and further comprising a convolutional decoder coupled to the despreader, the convolutional decoder operable to decode the in-phase and quadrature components of the downlink signal into a single bit stream.

39. The wireless receiver of Claim 38, further comprising a frame extractor coupled to the convolutional decoder, the frame extractor operable to extract a power control signal and a code synchronization signal from the single bit stream.

40. The wireless receiver of Claim 38, further comprising a frame extractor coupled to the convolutional decoder, the frame extractor operable to extract a first user channel and a second user channel from the single bit stream.

41. The wireless receiver of Claim 35, further comprising:
a digital signal processor coupled to the despreader and operable to generate system parameter information for link reestablishment; and
a memory coupled to the digital signal processor and operable to store the system parameter information.

42. A method for wireless communication between a central terminal and a subscriber terminal located at a fixed distance from the central terminal, the method comprising:
receiving a downlink signal at an antenna;
converting the downlink signal into digital form;
despreading, in an acquisition mode and at a first rate, the downlink signal to recover control information; and
despreading, in a traffic mode and at a second rate, the downlink signal to recover control information and user traffic.

43. The method of Claim 42, wherein the downlink signal comprises in-phase and quadrature components .

44. The method of Claim 42, wherein the control information comprises:
a code synchronization signal; and
a power control signal.

45. The method of Claim 42, wherein the downlink signal comprises in-phase and quadrature components, and further comprising the step of decoding the in-phase and quadrature components of the downlink signal to generate a single bit stream.

46. The method of Claim 45, further comprising the step of extracting a power control signal and a code synchronization signal from the single bit stream.

47. The method of Claim 45, further comprising the step of extracting a first user channel and a second user channel from the single bit stream.

48. The method of Claim 42, further comprising:
extracting a power control signal and a code synchronization signal from control information in the downlink signal; and
extracting a first user channel and a second user channel from user traffic in the downlink signal.

49. The method of Claim 42, further comprising:
generating system parameter information for link reestablishment; and
storing the system parameter information in a memory.

50. A subscriber terminal for communicating with a central terminal located at a fixed distance from the subscriber terminal, the subscriber terminal comprising: a spreader operable to receive an information signal, the spreader further operable to combine the information signal with a code sequence signal to generate a spread signal;
a receiver operable to receive a code synchronization signal from the central terminal using a wireless link; and a code generator coupled to the spreader, the code generator operable to generate the code sequence signal in response to the code synchronization signal, the code synchronization signal specifying a phase adjustment to the code sequence signal .

51. The subscriber terminal of Claim 50, wherein the receiver comprises:
a despreader operable to receive a downlink signal from the central terminal; and
a frame extractor coupled to the despreader, the frame extractor operable to extract the code synchronization signal from the downlink signal.

52. The subscriber terminal of Claim 50, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a coarse phase adjustment; and
a fine phase adjustment.

53. The subscriber terminal of Claim 50, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a phase advance; and
a phase delay.

54. The subscriber terminal of Claim 50, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a coarse phase advance;
a fine phase advance;
a coarse phase delay; and
a fine phase delay.

55. The subscriber terminal of Claim 50, wherein the phase adjustment comprises a previous phase adjustment stored in a memory at the subscriber terminal .

56. A method for wireless communication between a subscriber terminal and a central terminal located at a fixed distance from the subscriber terminal, the method comprising the following steps performed at the subscriber terminal :
receiving an information signal associated with a user channel of the subscriber terminal;
receiving a code synchronization signal from the central terminal using a wireless link;
generating a code sequence signal in response to the code synchronization signal, the code synchronization signal specifying a phase adjustment to the code sequence signal; and
combining the information signal with the code sequence signal to generate a spread signal.

57. The method of Claim 56, wherein the step of receiving a code synchronization signal from the central terminal comprises:
receiving a downlink signal from the central terminal; despreading the downlink signal to generate a despread signal; and
extracting the code synchronization signal from the despread signal .

58. The method of Claim 56, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a course phase adjustment; and
a fine phase adjustment.

59. The method of Claim 56, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a phase advance; and
a phase delay.

60. The method of Claim 56, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a coarse phase advance;
a fine phase advance;
a coarse phase delay; and
a fine phase delay.

61. The method of Claim 56, further comprising the step of retrieving a previous phase adjustment stored in a memory at the subscriber terminal in response to the code synchronization signal.

62. A subscriber terminal for communicating with a central terminal located at a fixed distance from the subscriber terminal, the subscriber terminal comprising: a spreader operable to receive an information signal, the spreader further operable to combine the information signal with a code sequence signal to generate a spread signal;
a receiver operable to receive a power control signal from the central terminal using a wireless link; and
a transmitter coupled to the spreader and operable to receive the spread signal, the transmitter operable to amplify the spread signal in response to the power control signal, the power control signal specifying a power adjustment to the spread signal.

63. The subscriber terminal of Claim 62, wherein the receiver is further operable to receive a code synchronization signal from the central terminal using the wireless link, and further comprising a code generator coupled to the spreader, the code generator operable to generate the code sequence signal in response to the code synchronization signal, the code synchronization signal specifying a phase adjustment to the code sequence signal.

64. The subscriber terminal of Claim 62 , wherein the receiver comprises:
a despreader operable to receive a downlink signal from the central terminal; and
a frame extractor coupled to the despreader, the frame extractor operable to extract the power control signal from the downlink signal.

65. The subscriber terminal of Claim 62, wherein a plurality of possible power adjustments specified by the power control signal comprise:
a coarse power adjustment; and
a fine power adjustment.

66. The subscriber terminal of Claim 62, wherein a plurality of possible power adjustments specified by the power control signal comprise:
a power increment; and
a power decrement .

67. The subscriber terminal of Claim 62, wherein a plurality of possible power adjustments specified by the power control signal comprise:
a coarse power increment;
a fine power increment;
a coarse power decrement; and
a fine power decrement .

68. The subscriber terminal of Claim 62, wherein the power adjustment comprises a reset to a minimum power output .

69. The subscriber terminal of Claim 62, wherein the power adjustment comprises a setting to a nominal power mode.

70. A method for wireless communication between a subscriber terminal and a central terminal located at a fixed distance from the subscriber terminal, the method comprising:
receiving an information signal associated with a user channel of the subscriber terminal;
combining the information signal with a code sequence signal to generate a spread signal;
receiving a power control signal from the central terminal using a wireless link; and
amplifying the spread signal in response to the power control signal, the power control signal specifying a power adjustment to the spread signal.

71. The method of Claim 70, further comprising the step of receiving a code synchronization signal from the central terminal using the wireless link, the code synchronization signal specifying a phase adjustment to the code sequence signal.

72. The method of Claim 70, further comprising:
receiving a downlink signal from the central terminal; despreading the downlink signal to generate a despread signal; and
extracting the power control signal from the despread signal.

73. The method of Claim 70, wherein a plurality of possible power adjustments specified by the power control signal comprise:
a coarse power adjustment; and
a fine power adjustment.

74. The method of Claim 70, wherein a plurality of possible power adjustments specified by the power control signal comprise:
a power increment; and
a power decrement .

75. The method of Claim 70, wherein a plurality of possible power adjustments specified by the power control signal comprise :
a coarse power increment;
a fine power increment;
a coarse power decrement; and
a fine power decrement .

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76. A subscriber terminal for communicating with a central terminal, comprising:
a despreader operable to receive a downlink signal from the central terminal, the despreader operable in an acquisition mode and at a first rate to despread control information in the downlink signal, the despreader operable in a traffic mode and at a second rate to despread control information and user traffic in the downlink signal;
a frame extractor coupled to the despreader, the frame extractor operable to extract a code synchronization signal from the despread downlink signal;
a code generator operable to generate a code sequence signal in response to a phase adjustment specified in the code synchronization signal; and
a spreader coupled to the code generator, the spreader operable to receive an information signal associated with a user channel of the subscriber terminal, the spreader further operable to combine the information signal with the code sequence signal to generate an uplink signal for transmission to the central terminal.

77. The subscriber terminal of Claim 76, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a coarse phase adjustment; and
a fine phase adjustment.

78. The subscriber terminal of Claim 76, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a phase advance; and
a phase delay.

79. The subscriber terminal of Claim 76, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a coarse phase advance;
a fine phase advance;
a coarse phase delay; and
a fine phase delay.

80. The subscriber terminal of Claim 76, wherein the phase adjustment comprises a previous phase adjustment stored in a memory.

81. The subscriber terminal of Claim 76, wherein the downlink signal comprises in-phase and quadrature components, and further comprising a convolutional decoder coupled to the despreader, the convolutional decoder operable to decode the in-phase and quadrature components of the downlink signal into a single bit stream for delivery to the frame extractor.

82. The subscriber terminal of Claim 76, wherein the frame extractor extracts a first user channel and a second user channel from the downlink signal.

83. The subscriber terminal of Claim 76, further comprising:
a digital signal processor coupled to the despreader and operable to generate system parameter information for link reestablishment; and
a memory coupled to the digital signal processor and operable to store the system parameter information.

84. A method for communicating between a subscriber terminal and a central terminal located at a fixed distance from the subscriber terminal, the method comprising the following steps performed at the subscriber terminal :
receiving a downlink signal from the central terminal; despreading, in an acquisition mode and at a first rate, the downlink signal representing control information; despreading, in a traffic mode and at a second rate, the downlink signal representing control information and user traffic- extracting a code synchronization signal from the despread downlink signals;
receiving an information signal from a user channel associated with the subscriber terminal;
generating a code sequence signal in response to a phase adjustment specified in the code synchronization signal; and
combining the information signal with a code sequence signal to generate an uplink signal for transmission to the central terminal.

85. The method of Claim 84, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a coarse phase adjustment; and
a fine phase adjustment.

86. The method of Claim 84, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a phase advance; and
a phase delay.

87. The method of Claim 84, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a coarse phase advance;
a fine phase advance;
a coarse phase delay; and
a fine phase delay.

88. The method of Claim 84, wherein the downlink signal comprises in-phase and quadrature components, and further comprising the step of decoding the in-phase and quadrature components of the downlink signal into a single bit stream before the step of extracting.

89. The method of Claim 84, further comprising the step of extracting a first user channel and a second user channel from the despread downlink signal .

90. The method of Claim 84, further comprising:
generating system parameter information for link reestablishment ; and
storing the system parameter information in a memory.

91. A subscriber terminal for communicating with a central terminal, comprising:
a receive antenna operable to receive a downlink signal from the central terminal;
a receive converter coupled to the receive antenna and operable to convert the downlink signal into digital form; a despreader coupled to the receive converter, the despreader operable in an acquisition mode and at a first rate to despread control information in the downlink signal, the despreader operable in a traffic mode and at a second rate to despread control information and user traffic in the downlink signal;
a frame extractor coupled to the despreader, the frame extractor operable to extract a power control signal and a code synchronization signal from the despread downlink signal;
a code generator operable to generate a code sequence signal in response to a phase adjustment specified in the code synchronization signal;
a spreader coupled to the code generator, the spreader operable to receive an information signal associated with a user channel of the subscriber terminal, the spreader further operable to combine the information signal with the code sequence signal to generate an uplink signal;
a transmitter coupled to the spreader, the transmitter operable to receive the uplink signal, the transmitter further operable to amplify the uplink signal in response to a power adjustment specified in the power control signal; and
a transmit antenna coupled to the transmitter and operable to transmit the amplified uplink signal to the central terminal .

92. The subscriber terminal of Claim 91, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a coarse phase adjustment; and
a fine phase adjustment.

93. The subscriber terminal of Claim 91, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a coarse phase advance;
a fine phase advance;
a coarse phase delay; and
a fine phase delay.

94. The subscriber terminal of Claim 91, wherein a plurality of possible power adjustments specified by the power control signal comprise:
a coarse power adjustment; and
a fine power adjustment.

95. The subscriber terminal of Claim 91, wherein a plurality of possible power adjustments specified by the power control signal comprise :
a coarse power increment;
a fine power increment;
a coarse power decrement; and
a fine power decrement.

96. The subscriber terminal of Claim 91, wherein:
a plurality of possible phase adjustments specified by the code synchronization signal comprise a coarse phase adjustment and a fine phase adjustment; and
a plurality of possible power adjustments specified by the power control signal comprise a coarse power adjustment and a fine power adjustment.

97. The subscriber terminal of Claim 91, wherein:
a plurality of possible phase adjustments specified by the code synchronization signal comprise a coarse phase advance, a fine phase advance, a coarse phase delay, and a fine phase delay; and
a plurality of possible power adjustments specified by the power control signal comprise a coarse power increment, a fine power increment, a coarse power decrement, and a fine power decrement.

98. The subscriber terminal of Claim 91, further comprising a step attenuator coupled to the transmitter, the step attenuator operable to provide a low transmit power level and a high transmit power level for the subscriber terminal.

99. A method for communicating between a subscriber terminal and a central terminal, the method comprising the following steps performed at the subscriber terminal:
receiving a downlink signal from the central terminal; converting the downlink signal into digital form;
despreading, in an acquisition mode and at a first rate, control information in the downlink signal;
despreading, in a traffic mode and at a second rate, control information and user traffic in the downlink signal;
extracting a power control signal and a code synchronization signal from the despread downlink signal; receiving an information signal associated with a user channel of the subscriber terminal;
generating a code sequence signal in response to a phase adjustment specified in the code synchronization signal;
combining the information signal with the code sequence signal to generate an uplink signal;
amplifying the uplink signal in response to a power adjustment specified in the power control signal; and
transmitting the amplified uplink signal to the central terminal .

100. The method of Claim 99, further comprising the step of attenuating the amplified uplink signal to provide a low transmit power level and a high transmit power level for the subscriber terminal .

101. The method of Claim 99, further comprising the step of attenuating the amplified uplink signal to provide a low transmit power level and a high transmit power level for the subscriber terminal, wherein the low transmit power level corresponds to a standby mode and the high transmit power level corresponds to the traffic mode.

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102. The method of Claim 99, wherein a plurality of possible phase adjustments specified by the code synchronization signal comprise:
a coarse phase advance;
a fine phase advance;
a coarse phase delay; and
a fine phase delay.

103. The method of Claim 99, wherein a plurality of possible power adjustments specified by the power control signal comprise :
a coarse power increment;
a fine power increment;
a coarse power decrement; and
a fine power decrement .

104. The subscriber terminal of Claim 99, wherein:
a plurality of possible phase adjustments specified by the code synchronization signal comprise a coarse phase adjustment and a fine phase adjustment; and
a plurality of possible power adjustments specified by the power control signal comprise a coarse power adjustment and a fine power adjustment.

105. The subscriber terminal of Claim 99, wherein:
a plurality of possible phase adjustments specified by the code synchronization signal comprise a coarse phase advance, a fine phase advance, a coarse phase delay, and a fine phase delay; and
a plurality of possible power adjustments specified by the power control signal comprise a coarse power increment, a fine power increment, a coarse power decrement, and a fine power decrement .

106. The method of Claim 99, wherein the downlink signal comprises in-phase and quadrature components, and further comprising the step of decoding the in-phase and quadrature components of the downlink signal into a single bit stream.

107. The method of Claim 99, further comprising the step of extracting a first user channel and a second user channel from the despread downlink signal.

108. The method of Claim 99, further comprising;
generating system parameter information for link reestablishment; and
storing the system parameter information in a memory of the subscriber terminal.