Reverse link, closed loop power control in a code division multiple access system
First Claim
1. At a base station, a method for controlling transmitter power of a remote communication device which transmits a signal at a predetermined data rate of a plurality of data rates, each data rate having a different power level, the method comprising the steps of:
- receiving said signal;
determining a quality level of said received signal;
comparing said quality level to each of a plurality of quality thresholds which each correspond to a respective power level of said plurality of data rates;
generating a power control signal in response to said comparing step, said power control signal comprising a plurality of power control commands, each of said power control commands corresponding to one of said plurality of data rates; and
transmitting said power control signal to said remote communication device.
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Abstract
The process of the present invention enables a mobile radiotelephone to operate at a 100% duty cycle while providing closed loop power control. The base station measures the signal to noise ratio of the signal from the mobile and compares that SNR with the SNR threshold values the base station has for each data rate the mobile is capable of transmitting. The base station then generates power control commands to instruct the mobile to change its power depending on the outcome of the comparisons.
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Citations
10 Claims
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1. At a base station, a method for controlling transmitter power of a remote communication device which transmits a signal at a predetermined data rate of a plurality of data rates, each data rate having a different power level, the method comprising the steps of:
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receiving said signal; determining a quality level of said received signal; comparing said quality level to each of a plurality of quality thresholds which each correspond to a respective power level of said plurality of data rates; generating a power control signal in response to said comparing step, said power control signal comprising a plurality of power control commands, each of said power control commands corresponding to one of said plurality of data rates; and transmitting said power control signal to said remote communication device. - View Dependent Claims (2, 3, 4, 5)
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6. In a remote communication device having a transmitter which transmits a signal at a predetermined data rate of a plurality of data rates, each of said plurality of data rates having a different power level, said remote communication device communicating with a base station, a method for adjusting transmitter power of said remote communication device, said method comprising the steps of:
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transmitting a signal to said base station at a predetermined data rate of the plurality of data rates, said signal having a power level corresponding to said predetermined data rate; receiving a power control signal corresponding to said plurality of data rates, said power control signal comprising a plurality of power control commands, each of said power control commands corresponding to one of said plurality of data rates; and adjusting said transmitter power in response to said power control signal and said predetermined data rate. - View Dependent Claims (7, 8, 9, 10)
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Specification