US6449463B1
Expired / Lapsed
US
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Variable loop gain in double loop power control systems
Assignee: Qualcomm Inc
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Filing: 1998-10-29
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Granted: 2002-09-10
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Expires: 2018-10-29
Abstract
Abstract An apparatus and method for using a variable loop gain in a double-loop power control system to control the power of a forward link signal sent by a gateway to a user terminal to compensate for fading in a wireless communications system. In one embodiment the invention includes the steps of detecting fast fading in the forward link signal and informing the gateway of the fast fading; and at the gateway, reducing the loop gain of the power control loop when fast fading is indicated. In another embodiment, the invention includes the steps of, at the gateway, detecting fast fading in a reverse link signal received from the user terminal and reducing the loop gain of the power control loop when fast fading is indicated.
Inventors
- 👤 Leonard N. Schiff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:25
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/06; H04W52/12; H04W52/18; H04W52/20; H04W52/22; H04W52/225; H04W52/228; H04W52/24; H04W52/30; H04W52/36
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
162 words
An apparatus comprising: means coupled to a first station for measuring a signal-to-noise ratio of a signal transmitted by a second station, said signal comprising a plurality of frames; means for adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; means coupled to said first station for measuring a signal quality of the received signal; means for adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold, comprising: means for increasing said signal-to-noise ratio threshold when a current frame has an error and a predetermined number of previous frames have no errors with a preselected minimum period between increases; and means for decreasing said signal-to-noise ratio threshold otherwise; means coupled to said first station for measuring a fading rate of said signal; and means for adjusting said loop gain as a function of said fading rate and a fading rate threshold.
Claim 2
Independent Claim
162 words
An apparatus comprising: means coupled to a first station for measuring a signal-to-noise ratio of a signal transmitted by a second station, said signal comprising a plurality of frames; means for adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; means coupled to said first station for measuring a signal quality of the received signal; means for adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold, comprising: means for increasing said signal-to-noise ratio threshold when a current frame has an error and a predetermined number of previous frames have no errors with a preselected minimum period between increases; and means for decreasing said signal-to-noise ratio threshold otherwise; means coupled to said first station for measuring a fading rate of said signal; and means for adjusting said loop gain as a function of said fading rate and a fading rate threshold.
Claim 3
Dependent Claim
22 words
The apparatus of claim 1 , wherein said signal-to-noise ratio threshold is decreased by a preselected small amount over said minimum period.
Claim 4
Dependent Claim
43 words
The apparatus of claim 1 , wherein: said means for increasing comprises means for increasing said signal-to-noise ratio threshold by a predetermined amount; and said means for decreasing comprises means for decreasing said signal-to-noise ratio threshold by much less than said predetermined amount.
Claim 5
Independent Claim
158 words
An apparatus comprising: means coupled to a first station for measuring a signal-to-noise ratio of a signal transmitted by a second station; means for adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; means coupled to said first station for measuring a signal quality of the received signal; means for adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold; means coupled to said first station for measuring a fading rate of said signal; and means for adjusting said loop gain as a function of said fading rate and a fading rate threshold comprising: means for setting said loop gain to a first loop gain when said fading rate is below said fading rate threshold; and means for setting said loop gain to a second loop gain when said fading rate is above said fading rate threshold.
Claim 6
Independent Claim
158 words
An apparatus comprising: means coupled to a first station for measuring a signal-to-noise ratio of a signal transmitted by a second station; means for adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; means coupled to said first station for measuring a signal quality of the received signal; means for adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold; means coupled to said first station for measuring a fading rate of said signal; and means for adjusting said loop gain as a function of said fading rate and a fading rate threshold comprising: means for setting said loop gain to a first loop gain when said fading rate is below said fading rate threshold; and means for setting said loop gain to a second loop gain when said fading rate is above said fading rate threshold.
Claim 7
Dependent Claim
19 words
The apparatus of claim 4 , wherein said second loop gain is much smaller than said first loop gain.
Claim 8
Independent Claim
168 words
An apparatus comprising: means coupled to a first station for measuring a signal-to-noise ratio of a signal transmitted by a second station, said signal comprising a plurality of frames; means for adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; means coupled to said first station for measuring a signal quality of the received signal; means for adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold, comprising: means for increasing said signal-to-noise ratio threshold when a current frame has an error and a predetermined number of previous frames have no errors with a preselected minimum period between increases; and means for decreasing said signal-to-noise ratio threshold otherwise; means coupled to said second station for measuring a fading rate of a further signal transmitted by said first station; and means for adjusting said loop gain as a function of said fading rate and a fading rate threshold.
Claim 9
Independent Claim
168 words
An apparatus comprising: means coupled to a first station for measuring a signal-to-noise ratio of a signal transmitted by a second station, said signal comprising a plurality of frames; means for adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; means coupled to said first station for measuring a signal quality of the received signal; means for adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold, comprising: means for increasing said signal-to-noise ratio threshold when a current frame has an error and a predetermined number of previous frames have no errors with a preselected minimum period between increases; and means for decreasing said signal-to-noise ratio threshold otherwise; means coupled to said second station for measuring a fading rate of a further signal transmitted by said first station; and means for adjusting said loop gain as a function of said fading rate and a fading rate threshold.
Claim 10
Dependent Claim
22 words
The apparatus of claim 6 , wherein said signal-to-noise ratio threshold is decreased by a preselected small amount over said minimum period.
Claim 11
Dependent Claim
43 words
The apparatus of claim 6 , wherein: said means for increasing comprises means for increasing said signal-to-noise ratio threshold by a predetermined amount; and said means for decreasing comprises means for decreasing said signal-to-noise ratio threshold by much less than said predetermined amount.
Claim 12
Independent Claim
164 words
An apparatus comprising: means coupled to a first station for measuring a signal-to-noise ratio of a signal transmitted by a second station; means for adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; means coupled to said first station for measuring a signal quality of the received signal; means for adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold; means coupled to said second station for measuring a fading rate of a further signal transmitted by said first station; and means for adjusting said loop gain as a function of said fading rate and a fading rate threshold, comprising: means for setting said loop gain to a first loop gain when said fading rate is below said fading rate threshold; and means for setting said loop gain to a second loop gain when said fading rate is above said fading rate threshold.
Claim 13
Independent Claim
164 words
An apparatus comprising: means coupled to a first station for measuring a signal-to-noise ratio of a signal transmitted by a second station; means for adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; means coupled to said first station for measuring a signal quality of the received signal; means for adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold; means coupled to said second station for measuring a fading rate of a further signal transmitted by said first station; and means for adjusting said loop gain as a function of said fading rate and a fading rate threshold, comprising: means for setting said loop gain to a first loop gain when said fading rate is below said fading rate threshold; and means for setting said loop gain to a second loop gain when said fading rate is above said fading rate threshold.
Claim 14
Dependent Claim
19 words
The apparatus of claim 9 , wherein said second loop gain is much smaller than said first loop gain.
Claim 15
Independent Claim
149 words
A method comprising the steps of: measuring, at a first station, a signal-to-noise ratio of a signal transmitted by a second station, said signal comprising a plurality of frames; adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; measuring, at said first station, a signal quality of the received signal; adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold, comprising the steps of: increasing said signal-to-noise ratio threshold when a current frame has an error and a predetermined number of previous frames have no errors with a preselected minimum period between increases; and decreasing said signal-to-noise ratio threshold otherwise; measuring, at said first station, a fading rate of said signal; and adjusting said loop gain as a function of said fading rate and a fading rate threshold.
Claim 16
Independent Claim
149 words
A method comprising the steps of: measuring, at a first station, a signal-to-noise ratio of a signal transmitted by a second station, said signal comprising a plurality of frames; adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; measuring, at said first station, a signal quality of the received signal; adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold, comprising the steps of: increasing said signal-to-noise ratio threshold when a current frame has an error and a predetermined number of previous frames have no errors with a preselected minimum period between increases; and decreasing said signal-to-noise ratio threshold otherwise; measuring, at said first station, a fading rate of said signal; and adjusting said loop gain as a function of said fading rate and a fading rate threshold.
Claim 17
Dependent Claim
22 words
The method of claim 11 , wherein said signal-to-noise ratio threshold is decreased by a preselected small amount over said minimum period.
Claim 18
Dependent Claim
43 words
The method of claim 11 , wherein: said increasing step comprises the step of increasing said signal-to-noise ratio threshold by a predetermined amount; and said decreasing step comprises the step of decreasing said signal-to-noise ratio threshold by much less than said predetermined amount.
Claim 19
Independent Claim
145 words
A method comprising the steps of: measuring, at a first station, a signal-to-noise ratio of a signal transmitted by a second station; adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; measuring, at said first station, a signal quality of the received signal; adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold; measuring, at said first station, a fading rate of said signal; and adjusting said loop gain as a function of said fading rate and a fading rate threshold, comprising the steps of: setting said loop gain to a first loop gain when said fading rate is below said fading rate threshold; and setting said loop gain to a second loop gain when said fading rate is above said fading rate threshold.
Claim 20
Independent Claim
145 words
A method comprising the steps of: measuring, at a first station, a signal-to-noise ratio of a signal transmitted by a second station; adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; measuring, at said first station, a signal quality of the received signal; adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold; measuring, at said first station, a fading rate of said signal; and adjusting said loop gain as a function of said fading rate and a fading rate threshold, comprising the steps of: setting said loop gain to a first loop gain when said fading rate is below said fading rate threshold; and setting said loop gain to a second loop gain when said fading rate is above said fading rate threshold.
Claim 21
Dependent Claim
19 words
The method of claim 14 , wherein said second loop gain is much smaller than said first loop gain.
Claim 22
Independent Claim
155 words
A method comprising the steps of: measuring, at a first station, a signal-to-noise ratio of a signal transmitted by a second station, said signal comprising a plurality of frames; adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; measuring, at said first station, a signal quality of the received signal; adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold, comprising the steps of: increasing said signal-to-noise ratio threshold when a current frame has an error and a predetermined number of previous frames have no errors with a preselected minimum period between increases; and decreasing said signal-to-noise ratio threshold otherwise; measuring, at said second station, a fading rate of a further signal transmitted by said first station; and adjusting said loop gain as a function of said fading rate and a fading rate threshold.
Claim 23
Independent Claim
155 words
A method comprising the steps of: measuring, at a first station, a signal-to-noise ratio of a signal transmitted by a second station, said signal comprising a plurality of frames; adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; measuring, at said first station, a signal quality of the received signal; adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold, comprising the steps of: increasing said signal-to-noise ratio threshold when a current frame has an error and a predetermined number of previous frames have no errors with a preselected minimum period between increases; and decreasing said signal-to-noise ratio threshold otherwise; measuring, at said second station, a fading rate of a further signal transmitted by said first station; and adjusting said loop gain as a function of said fading rate and a fading rate threshold.
Claim 24
Dependent Claim
22 words
The method of claim 16 , wherein said signal-to-noise ratio threshold is decreased by a preselected small amount over said minimum period.
Claim 25
Dependent Claim
43 words
The method of claim 16 , wherein said increasing step comprises the step of increasing said signal-to-noise ratio threshold by a predetermined amount; and said decreasing step comprises the step of decreasing said signal-to-noise ratio threshold by much less than said predetermined amount.
Claim 26
Independent Claim
151 words
A method comprising the steps of: measuring, at a first station, a signal-to-noise ratio of a signal transmitted by a second station; adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; measuring, at said first station, a signal quality of the received signal; adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold; measuring, at said second station, a fading rate of a further signal transmitted by said first station; and adjusting said loop gain as a function of said fading rate and a fading rate threshold comprising the steps of: setting said loop gain to a first loop gain when said fading rate is below said fading rate threshold; and setting said loop gain to a second loop gain when said fading rate is above said fading rate threshold.
Claim 27
Independent Claim
151 words
A method comprising the steps of: measuring, at a first station, a signal-to-noise ratio of a signal transmitted by a second station; adjusting a transmitted signal power of said signal as a function of a loop gain, said signal-to-noise ratio, and a signal-to-noise ratio threshold; measuring, at said first station, a signal quality of the received signal; adjusting said signal-to-noise ratio threshold as a function of said signal quality and a signal quality threshold; measuring, at said second station, a fading rate of a further signal transmitted by said first station; and adjusting said loop gain as a function of said fading rate and a fading rate threshold comprising the steps of: setting said loop gain to a first loop gain when said fading rate is below said fading rate threshold; and setting said loop gain to a second loop gain when said fading rate is above said fading rate threshold.
Claim 28
Dependent Claim
19 words
The method of claim 19 , wherein said second loop gain is much smaller than said first loop gain.
References Cited (Backward Citations)
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