| 摘要 |
The present invention provides a data transmission method and a network side device. The method includes: establishing a mapping relation between a first identifier of data required to be sent in a first retransmission request process and a second identifier of the data in a second retransmission request process,; and sending the data, where in the second retransmission request process updates, according to the mapping relation and a sending status of the data, sending status information of the data in the first retransmission request process, so that in the first retransmission request process, whether to retransmit the data is determined according to the sending status information of the data.
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