Method and apparatus for performing fast power control in a mobile communication system
First Claim
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1. An apparatus for dynamically controlling transmission power from a central CDMA communications station, comprising:
- receiver means for receiving a signal from a remote station; and
transmitter means for adjusting a transmission power for the received signal to an acceptable level following a transmission power increase, wherein the acceptable level is determined by a method comprising the steps of;
determining the cause of the transmission power increase, wherein the cause of the transmission power increase may be a random fade condition or a continuing fade condition;
if the cause of the transmission power increase is a random fade condition, then reducing the transmission power at a first predetermined rate for a first predetermined time period in response to the transmission power increase;
if the transmission power is still at an unacceptable level after the step of reducing the transmission power at a first predetermined rate for a first predetermined time period, then continuing to reduce the transmission power at a second predetermined rate for at least one other predetermined time period following the first predetermined time period, wherein the first predetermined time period and the at least one other predetermined time period may or may not be of equal duration; and
if the cause of the transmission power increase is a continuing fade condition, then maintaining the transmission power at the level of the transmission power increase.
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Abstract
A method and apparatus for controlling transmission power in a mobile communication system is disclosed. The method disclosed provides for a closed-loop power control method for variable rate transmissions. The power of transmissions is varied in accordance with the rate of the frames of data being transmitted. The transmission power between the rates can be a fixed or variable difference.
120 Citations
10 Claims
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1. An apparatus for dynamically controlling transmission power from a central CDMA communications station, comprising:
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receiver means for receiving a signal from a remote station; and
transmitter means for adjusting a transmission power for the received signal to an acceptable level following a transmission power increase, wherein the acceptable level is determined by a method comprising the steps of;
determining the cause of the transmission power increase, wherein the cause of the transmission power increase may be a random fade condition or a continuing fade condition;
if the cause of the transmission power increase is a random fade condition, then reducing the transmission power at a first predetermined rate for a first predetermined time period in response to the transmission power increase;
if the transmission power is still at an unacceptable level after the step of reducing the transmission power at a first predetermined rate for a first predetermined time period, then continuing to reduce the transmission power at a second predetermined rate for at least one other predetermined time period following the first predetermined time period, wherein the first predetermined time period and the at least one other predetermined time period may or may not be of equal duration; and
if the cause of the transmission power increase is a continuing fade condition, then maintaining the transmission power at the level of the transmission power increase. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for controlling transmission power of variable rate frames of data, comprising:
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control processor means for providing a transmit power signal and is further for determining a reference rate transmit power level, and for determining at least one additional reference rate transmit power level in accordance with the reference rate transmit power;
variable gain transmitter means for receiving the transmit power signal and a frame rate signal, and for amplifying the variable rate frames in accordance with the transmit power signal and the frame rate signal; and
variable rate data source means for providing the variable rate data frames and the frame rate signal. - View Dependent Claims (9, 10)
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Specification