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Thursday, April 28, 2011

Power Control

Open loop power control make rough estimate of path loss by means of a downlink beacon signal. This may not be accurate.
Closed loop power control is performed in the uplink; base station performs frequent estimates of the received Signal-to-Interference Ratio (SIR) and compares it to a target SIR. If the measured SIR is higher than the target SIR, the base station will command the mobile station to lower the power; if it is too low it will command the mobile station to increase its power.

Outer loop power control a procedure where target SIR is changed based on signal quality. Based on the quality of radio link measure in the uplink for each user data channel regulates the target SIR.

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