| 摘要 |
Disclosed are a data transmission method, apparatus, and system. The method comprises: receiving a protocol data unit (PDU), a first identifier in header information of the PDU indicating whether data in the PDU is retransmitted data. Through the data transmission method disclosed in the embodiment of the present invention, the troublesome process in the prior art that a receiver determines whether a received PDCP PDU contains retransmitted data can be solved, and the efficiency of the transmission process is enhanced.
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