| CPC H04L 1/1614 (2013.01) [H04L 1/1812 (2013.01)] | 20 Claims |

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1. A data transmission method, comprising:
generating a data frame, wherein the data frame comprises a payload format identifier bit for indicating a modulation and coding scheme (MCS) applied to a payload of the data frame and a retransmission identifier bit for indicating whether the data frame is a retransmission data frame, the payload of the data frame comprises a media access control protocol data unit (MPDU) or an aggregation MPDU (A-MPDU), and the retransmission identifier bit is located within a header of the data frame; and
transmitting the data frame.
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