Gain control method and apparatus

The present application relates to a gain control method and apparatus, comprising an automatic gain controller. PSS input power of a main synchronization signal in an input signal is detected in real time; a downlink PSS rated power that acts as a gain control threshold of the automatic gain controller is acquired; and according to the magnitudes of the PSS input power and the downlink PSS rated power, the automatic gain controller is controlled to adjust a gain attenuation value, which is used to adjust an uplink gain and a downlink gain. In the present application, the downlink PSS rated power is used as the gain control threshold of the automatic gain controller, the magnitude relationship between the inputted PSS input power and downlink PSS rated power is detected to control the levels of uplink and downlink input signals, the uplink gain and downlink gain are further controlled so as to prevent frequent switching of signal levels, and at the same time, linkage control of the downlink gain and uplink gain is performed to prevent interference with a base station due to excessively high uplink noise floor.