Method and apparatus for controlling transmission power in a cellular mobile communication system
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United States of America Patent
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Jul 13, 1999
Grant Date -
N/A
app pub date -
May 1, 1997
filing date -
Oct 18, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power control apparatus for controlling transmission power of a mobile unit through a step size based power control implemented in a closed loop control system in a cellular mobile communication system which improves power control performance by reducing power control error and increasing system channel capacity involving power control delay. The improved power control apparatus has a feedback function of a transmission power control command signal, transmission power command (TPC) bit, implemented in an adjuster including an adder, a delay circuit, and an amplifier at a base station. Through the TPC-bit feedback function, the power control error of transmission power from the mobile unit not adjusted based upon a TPC bit currently generated and transmitted to the mobile unit due to the power control delay is adjusted with a power predicted through the feedback loop based upon the same TPC bit to generate a quality TPC bit.
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