Method of power control for a wireless communication system having multiple information rates
First Claim
1. A method for controlling the power in a wireless communication system, the method comprising the steps of:
- determining a target value of a signal quality parameter to achieve a required signal quality for a full information rate frame of data of a received signal;
determining a target value of the signal quality parameter for a fractional information rate frame of the received signal as a proportional adjustment to the full-rate target value, the proportional adjustment being a function of a fraction the fractional information rate frame bears to the full information rate;
adjusting the fractional-rate target value by a variable power control scaling factor, wherein the variable power control scaling factor represents a fraction by which the fractional-rate target value can be reduced while maintaining the required signal quality for the frame; and
evaluating a received value of the signal quality parameter for ones of power control groups in frames transmitted at the fractional information rate against the adjusted fractional-rate target value.
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Accused Products
Abstract
A method of controlling the power in a wireless communication system. In one embodiment of the invention, a base station determines the information rate of a signal to be transmitted to a mobile station, and obtains the variable power control scaling factor based on this information rate. The base station then transmits the variable power control scaling factor to the mobile station. The mobile station determines a target signal quality measurement for a received signal from the base station, such as a target Eb/N0, and scales the target Eb/N0 by the variable power control scaling factor. The mobile station also obtains an information rate scaling factor based on the information rate of the received signal, and further scales the target Eb/N0 by this information rate scaling factor. The mobile station then compares the target Eb/N0 to a measured Eb/N0 of the received signal. An increase in power of the received signal is requested when the measured Eb/N0 of the received signal is smaller than the scaled Eb/N0. A decrease in power of the received signal is requested when the measured Eb/N0 of the received signal is larger than the scaled Eb/N0. Providing the variable power control scaling factor to the mobile station allows frames having an information rate lower than the full rate to be transmitted at a power even lower than the power of a frame having an information rate equal to the full rate times the information scaling factor.
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Citations
19 Claims
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1. A method for controlling the power in a wireless communication system, the method comprising the steps of:
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determining a target value of a signal quality parameter to achieve a required signal quality for a full information rate frame of data of a received signal;
determining a target value of the signal quality parameter for a fractional information rate frame of the received signal as a proportional adjustment to the full-rate target value, the proportional adjustment being a function of a fraction the fractional information rate frame bears to the full information rate;
adjusting the fractional-rate target value by a variable power control scaling factor, wherein the variable power control scaling factor represents a fraction by which the fractional-rate target value can be reduced while maintaining the required signal quality for the frame; and
evaluating a received value of the signal quality parameter for ones of power control groups in frames transmitted at the fractional information rate against the adjusted fractional-rate target value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
measuring a signal quality value of the received signal;
comparing the measured signal quality value of the received signal to the scaled target signal quality value;
requesting an increase in power of the received signal responsive to the measured signal quality value of the received signal being smaller than the scaled target signal quality value; and
requesting a decrease in power of the received signal responsive to the measured signal quality value of the received signal being larger than the scaled target signal quality value.
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5. The method of claim 1, wherein the variable power control scaling factor is received in a message of the paging channel.
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6. The method of claim 1, wherein the variable power control scaling factor is received in a message of the traffic channel.
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7. The method of claim 1, wherein the scaling step operates on ones of power control group intervals in the frame.
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8. A method for controlling transmitter power in a wireless system, the method comprising the steps of:
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determining a target value of a signal quality parameter to achieve a required signal quality for a full information rate frame of data of a received signal;
determining a target value of the signal quality parameter for a fractional information rate frame of the received signal as a proportional adjustment to the full-rate target value, the fractional-rate target value being proportional to the full-rate target value in the proportion that the fractional information rate bears to the full information rate;
determining a variable power control scaling factor representing a factor by which the fractional-rate target value can be reduced while maintaining a required signal quality at the fractional information frame rate;
scaling the target signal quality parameter value for the fractional information rate by the variable power control scaling factor;
adjusting transmitter power for a power control interval in a fractional information rate frame as a function of a difference between a service quality parameter value measured for that interval and the scaled target signal quality parameter value. - View Dependent Claims (9, 10, 11, 12, 13)
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14. In a wireless communication system wherein information signals are transmitted at a full and one or more fractional information rates, and wherein target values of a signal quality parameter needed to achieve a specified signal quality are provided for a full-rate information frame and for at least one fractional-rate information frame, the fractional-rate target value being proportional to the full-rate target value in the proportion that the fractional information rate bears to the full information rate, a method for controlling transmission power in the wireless communication system comprising the steps of:
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adjusting the fractional-rate target value by a variable power control scaling factor, wherein the variable power control scaling factor represents a fraction by which the fractional-rate target value can be reduced while maintaining a required signal quality for the frame; and
evaluating a received value of the signal quality parameter for ones of power control groups in frames transmitted at the fractional information rate against the adjusted fractional-rate target value. - View Dependent Claims (15, 16, 17, 18, 19)
requesting an increase in power of the received signal responsive to the received value of the signal quality parameter being smaller than the adjusted fractional-rate target value; and
requesting a decrease in power of the received signal responsive to the received value of the signal quality parameter being larger than the adjusted fractional-rate target value.
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18. The method of claim 14, wherein the variable power control scaling factor is received in a message of the reverse pilot channel.
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19. The method of claim 14, wherein the scaling step operates on ones of power control group intervals in the frame.
Specification