Method and apparatus for determining the closed loop power control set point in a wireless packet data communication system
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United States of America Patent
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Oct 14, 2003
Grant Date -
N/A
app pub date -
Aug 6, 1999
filing date -
Aug 6, 1999
priority date (Note) -
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Abstract
The present invention is a novel and improved method and apparatus for performing closed loop power control. A method of implementing reverse link outer loop using only pilot signal is described. Such a method is especially useful when the data signals are only present in short burst such that packet or frame error rates (PER or FER) cannot be estimated accurately. Moreover, since this method provides a mechanism for accurate set point adjustment even without a PER (FER) estimate, it can also be used to improve the accuracy of outer loop performance when such estimate becomes available. The present invention estimates a 'pilot bit error rate' (PBER), where each pilot 'bit' consists of a number pilot chips distributed over a frame. In addition, it estimates the normalized variance of the signal energy (or C/I) for each packet. In addition, in the preferred embodiment, the average number of fingers in lock is also used to determine the power control set point.
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