METHOD AND APPARATUS FOR DETERMINING CODE BLOCK LOSS

This application discloses a block group loss determining method and an apparatus. The method includes: A transmit end obtains at least two block groups, and sends the at least two block groups to a receive end. The receive end receives the at least two block groups, obtains a receiving quantity of first block groups between a first boundary block group and a second boundary block group in the at least two code groups, then obtains a target quantity of first block groups between the first boundary block group and the second boundary block group, and determines a quantity of lost block groups based on the receiving quantity and the target quantity. In embodiments of this application, when there is a discarded block group, a number of lost block groups can be accurately determined, and a line bit error rate can be obtained.