通过对rtt的分析发现，变化的传输延迟和延迟ack将对使用RTT指示拥塞引入明显误差，从而影响dca算法的准确性。

By analyzing RTT's component, it is found that various transmitting delay and delayed ACK bring obvious errors in using RTT as the signal of network congestion, and affect DCA algorithms' veracity.

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该算法用显示拥塞指示标记取代丢包机制，用于通知源端网络即将发生拥塞，采用PID控制器实现反响控制，保证系统白勺稳定性。

In this algorithm, the mechanism of dropping packet is replaced with ECN marks. It USES the PID controller as feed-backward compensation to ensure the stability of the system.

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