Error correction may generally be realized in two different ways: Automatic repeat request (ARQ) (sometimes also referred to as backward error correction): This is an error control technique whereby an error detection scheme is combined with requests for retransmission of corrupted data.
错误纠正通常可以用两种方式实现： 自动重传请求（ARQ），有时也称后向纠错：这是一种错误控制技术，其中将错误检测方案与重传错误数据的请求组合。