Method and system for closed loop power control in wireless systems
OwnerLijun Qian, Zoran Gajicinventors
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Abstract
The present invention relates to a method and system for closed loop power control in a mobile communication system. Error is determined between a target signal-to-interference (SIR) and a received SIR. A power control scheme at a power controller of a base station determines a power change that is proportional to the error. Gain of the power controller is selected to achieve minimum error at a subsequent time instant.
Claims20
A transmission power control method for a mobile communication system comprising the steps of:
- determining a target Signal-to-Interference Ratio (SIR);
- estimating a received SIR of a base station;
- determining error between the received SIR and the target SIR;
- and
- determining a power control scheme at a power controller of the base station to determine a power change for the transmission power of a mobile to the base station in proportion to the error;
- and
- selecting a gain of the power controller to achieve minimum error at a subsequent time instant.
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A transmission power control system for a mobile communication system comprising:
- means for determining a target Signal-to-Interference Ratio (SIR);
- means for estimating a received SIR of a base station;
- means for determining error between the received SIR and the target SIR;
- and
- means for determining a power control scheme at a power controller of the base station to determine a power change for the transmission power of a mobile to the base station in proportion to the error;
- and
- means for selecting a gain of the power controller to achieve minimum error at a subsequent time instant.
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Dependencies are inferred from the claim text.