Method and system for power control in wireless networks using interference prediction with an error margin
First Claim
1. A method for power control in a wireless network, comprising:
- measuring an interference power value at an intended receiver for a first time slot;
predicting a second interference power value at the intended receiver for a second time slot using the measured interference power value;
estimating an error margin for the predicted second interference power value; and
selecting a transmission power for the second time slot based on the predicted second interference power value and the error margin.
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Accused Products
Abstract
An enhanced power control method for use in a wireless packet-switched network having an interference prediction algorithm which includes an error margin. In particular, the method can measure an interference power and a path gain between an intended receiver and transmitter. Based upon the past performance of the network, a future interference value may be predicted by using a prediction algorithm. Furthermore, based upon the prior accuracy of the interference prediction, the method can also estimate an error margin for the interference prediction. Finally, a transmission power for the transmitter can be calculated using the predicted interference power, the estimated error margin for the predicted interference power, the path gain, and the target SINR.
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Citations
23 Claims
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1. A method for power control in a wireless network, comprising:
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measuring an interference power value at an intended receiver for a first time slot;
predicting a second interference power value at the intended receiver for a second time slot using the measured interference power value;
estimating an error margin for the predicted second interference power value; and
selecting a transmission power for the second time slot based on the predicted second interference power value and the error margin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
determining a probability distribution of error between the predicted second interference power value and an actual second interference power value; and
estimating the error margin based on a desired probability and the probability distribution of error.
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3. The method according to claim 1, wherein the step of selecting a transmission power comprises calculating a transmission power to meet a target signal-to-interference-and-noise ratio (SINR).
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4. The method according to claim 3, further including the step of determining a path gain parameter between at least one transmitter and a receiver.
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5. The method according to claim 4, wherein the step of selecting a transmission power to meet a target SINR includes multiplying the second interference power value by a target signal to interference ratio (SINR) parameter and the error margin, and dividing by the path gain parameter.
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6. The method according to claim 4, wherein the path gain parameter is estimated using a prediction algorithm.
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7. The method according to claim 6, wherein the prediction algorithm is a Kalman filter.
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8. The method according to claim 1, further including the steps of transmitting the selected transmission power to an intended transmitter.
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9. The method according to claim 8, wherein the intended transmitter is a base station.
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10. The method according to claim 8 wherein the intended transmitter is a mobile terminal.
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11. The method according to claim 1 wherein the step of predicting a second interference power value for a second time slot comprises using a Kalman filter to estimate an interference power value for the second time slot using the measured interference power value.
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12. Method for power control in a wireless network using a Kalman filter, comprising:
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measuring an interference power value at a receiver for a time slot;
inputting the measured interference power value to a Kalman filter to predict a second interference power value at the receiver for a second time slot;
estimating an error margin for the predicted second interference power value; and
selecting a transmission power for the second time slot in order to meet a target signal to interference and noise ratio (SINR). - View Dependent Claims (13, 14, 15)
determining a probability distribution of error between the predicted second interference power value and an actual second interference power value; and
estimating the error margin based on a desired probability and the probability distribution of error.
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14. The method according to claim 12, further including the step of determining a path gain parameter between at least one transmitter and a receiver.
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15. The method according to claim 12, wherein the step of selecting a transmission power for the second time slot comprises multiplying the second interference power by a target SINR and the error margin, and dividing by the path gain parameter.
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16. A wireless packet-switched communication system with power control, comprising:
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at least one cell comprising;
a base station having at least a transponder and an antenna;
at least one mobile terminal including at least a transponder and an antenna;
an electronic device for measuring an interference power value at an intended receiver for a time slot;
a central processing unit (CPU) adapted to perform the steps of;
predicting a second interference power value for a second time slot;
estimating an error margin for the predicted second interference power value; and
selecting a transmission power for the second time slot based at least the second interference power value and the error margin. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
determining a probability distribution of error between the predicted second interference power value and an actual second interference power value; and
estimating the error margin based on a desired probability and the probability distribution of error.
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18. The wireless communication system according to claim 16 wherein the step of selecting a transmission power comprises calculating a transmission power to meet a target SINR.
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19. The wireless communication system of claim 18, further including an electronic device to measure a path gain parameter between the base station and the at least one mobile terminal.
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20. The wireless communication system of claim 19, wherein the step of selecting a transmission power to meet a target SINR comprises multiplying the second interface power value by a target SINR parameter and the error margin, and divide by the path gain parameter.
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21. The wireless communication system of claim 16, wherein the intended transmitter is the base station.
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22. The wireless communication system according to claim 16, wherein the intended transmitter is a mobile terminal.
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23. The wireless communication system according to claim 16, wherein the CPU is further adapted to perform this step of transmitting the selected transmission power to an intended transmitter.
Specification