Method and apparatus for adjusting a signal-to-interference threshold in a closed loop power control communications system
First Claim
1. An apparatus used to adjust a signal-to-interference ratio (SIR) threshold used in a closed loop power control system of a wireless communications network, said closed loop power control system having an inner loop and an outer loop, comprising:
- detection means for identifying typical inner loop power control command patterns, wherein said typical inner loop power control command patterns are indicative of said inner loop not correctly commanding that transmission power be changed; and
outer loop power control means, communicatively coupled to said detection means, for adjusting an SIR threshold in accordance with said inner loop power control patterns.
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Abstract
A method and apparatus for dynamically adjusting the signal-to-interference ratio (SIR) threshold used to control signal transmission power in closed loop communication systems. The closed loop power control comprises an inner loop that provides up/down transmission power control commands to a transmitter based upon a comparison of the SIR for a received signal to the threshold SIR. The outer loop dynamically adjusts the threshold SIR using historic inner loop power control information. When it is detected that the inner loop is not acceptably performing power control, the target SIR is not changed, or may increased or decreased more or less than 0.5 dB or 0.5 dB/99, respectively.
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Citations
25 Claims
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1. An apparatus used to adjust a signal-to-interference ratio (SIR) threshold used in a closed loop power control system of a wireless communications network, said closed loop power control system having an inner loop and an outer loop, comprising:
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detection means for identifying typical inner loop power control command patterns, wherein said typical inner loop power control command patterns are indicative of said inner loop not correctly commanding that transmission power be changed; and
outer loop power control means, communicatively coupled to said detection means, for adjusting an SIR threshold in accordance with said inner loop power control patterns. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for adjusting a signal-to-interference ratio (SIR) threshold of a closed loop power control system used in a wireless communications network, said closed loop power control system having an inner loop and an outer loop, comprising the steps of:
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generating inner loop power control commands in accordance with a comparison between a first quality metric and a variable threshold;
adjusting said variable threshold in accordance with said first quality metric unless a second quality metric indicates that said inner loop power control commands are not appropriate, and if said inner loop power commands are not appropriate, then either;
(a) suspending the adjustment of said variable threshold, or (b) adjusting said variable threshold by an amount less than the amount the adjustment would have been if said adjustment had been made based only on said first quality metric. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for adjusting a signal-to-interference ratio (SIR) threshold used in a closed loop power control system of a wireless communications network, said closed loop power control system having an inner loop and an outer loop, comprising:
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identifying typical inner loop power control command patterns, wherein said typical inner loop power control command patterns are indicative of said inner loop not correctly commanding that transmission power be changed; and
adjusting said SIR threshold in accordance with said inner loop power control patterns. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for adjusting a signal-to-interference ratio (SIR) threshold of a closed loop power control system used a wireless communications network, said closed loop power control system having an inner loop and an outer loop, comprising:
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generating inner loop power control commands in accordance with a comparison between a first quality metric and a variable threshold; and
adjusting said variable threshold in accordance with said first quality metric unless a second quality metric indicates that said inner loop power control commands are not appropriate. - View Dependent Claims (20, 21, 22, 23)
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24. A computer readable medium embodying a method for adjusting a signal-to-interference ratio (SIR) threshold of a closed loop power control system used a wireless communications network, said closed loop power control system having an inner loop and an outer loop, the method comprising:
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generating inner loop power control commands in accordance with a comparison between a first quality metric and a variable threshold; and
adjusting said variable threshold in accordance with said first quality metric unless a second quality metric indicates that said inner loop power control commands are not appropriate, and if said inner loop power commands are not appropriate, then either;
suspending the adjustment of said variable threshold, or adjusting said variable threshold by an amount less than the amount the adjustment would have been if said adjustment had been made based only on said first quality metric.
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25. An apparatus for adjusting a signal-to-interference ratio (SIR) threshold of a closed loop power control system used a wireless communications network, said closed loop power control system having an inner loop and an outer loop, comprising:
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means for generating inner loop power control commands in accordance with a comparison between a first quality metric and a variable threshold; and
means for adjusting said variable threshold in accordance with said first quality metric unless a second quality metric indicates that said inner loop power control commands are not appropriate, and if said inner loop power commands are not appropriate, then said means for adjusting further including either;
means for suspending the adjustment of said variable threshold, or means for adjusting said variable threshold by an amount less than the amount the adjustment would have been if said adjustment had been made based only on said first quality metric.
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Specification