You enable lower granularity for the retransmission timer for this connection and resend the packet.
您为这个连接启用了更低粒度的重新传输计时器，并重新发送数据包。
2
If the ack is from the expected node, the retransmission of the packet is cancelled.
收到一个应答时调用。如果应答是期望的节点，将取消数据包重发。
3
We set up a system for packet transmission and transmission control, and propose a layered retransmission error control mechanism based on immediate feedback.