A link adaptation outer loop control method and system. The method comprises: determining, according to transmission efficiency and a retransmission rate of an Nth-order modulation and coding scheme (MCS) and transmission efficiency and a retransmission rate of an (N+1)th-order MCS, decision limits of a reference value compensation amount under the (N+1)th-order MCS, N being a positive integer; and when a processing cycle of the reference value compensation amount is reached, comparing statistical information of acknowledgments (ACKs) and negative acknowledgments (NACKs) in the processing cycle with the decision limits, and processing the reference value compensation amount according to a comparison result. The link adaptation outer loop control method and system solve the problem of system throughput loss caused by using a uniform decision limit, thereby improving the overall system throughput while ensuring the stability of the system.
LINK ADAPTATION OUTER LOOP CONTROL METHOD AND SYSTEM