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.
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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