为了缓解TCP拥塞控制机制对于往返时间(rtt)较小流的偏向问题，现有方法在网络拥塞程度严重时由于对rtt较大流的过分保护而不能有效地工作。
To mitigate the bias of TCP congestion mechanisms to short RTT flows, the existing methods cannot work well when network congestion level is high due to the over protecting to long RTT flows.
流核中心线偏离环空中心线，且偏向环空内侧。
The center line of the flow care is partial to the inner side of annulus.
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