拥塞控制算法主要分为两部分：在端系统上使用的源算法和在网络设备上使用的链路算法。
The congestion control algorithm mainly divides into two parts: source algorithm which USES on the end system and the link algorithm which USES on the network equipment.
由于TCP端到端的本质，拥塞控制的源算法无法利用网络中的具体信息进行理想地拥塞控制。
Due to the end-to-end essence of TCP, the source algorithm of congestion control can't acquire enough information of intermediate network to control traffic ideally.
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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