Patent ID: 8897153

Claim:
A method for adjusting downlink Adaptive Modulation and Coding (AMC) and Multiple Input and Multiple Output (MIMO) modes comprising: a base station determining a current maximum available Downlink Interval Usage Code (DIUC) using a downlink Carrier to Interference plus Noise Ratio (CINR) fed back by a terminal, using a MIMO mode fed back by the terminal to determine a current channel condition, and jointly adjusting a current MIMO mode and a the DIUC of the terminal within a maximum available DIUC range according to the current channel condition; wherein the step of jointly adjusting the current MIMO mode and the DIUC of the terminal within the maximum available DIUC range comprises: when a DIUC currently used by the terminal is greater than the maximum available DIUC, adjusting the DIUC currently used by the terminal to the maximum available DIUC, and adjusting the current MIMO mode of the terminal to a Space Time Coding (STC) mode; when the DIUC currently used by the terminal is less than or equal to the maximum available DIUC, the terminal is currently in the STC mode, and the MIMO mode fed back by the terminal is a spatial multiplexing (SM) mode, switching the current MIMO mode of the terminal to the SM mode, while remaining the currently used DIUC unchanged; when the DIUC currently used by the terminal is less than the maximum available DIUC, the terminal is currently in the STC mode, and the MIMO mode fed back by the terminal is also the STC mode, the base station adjusting the DIUC currently used by the terminal to the maximum available DIUC, while remaining the current MIMO mode unchanged.