高速网络拥塞控制协议VCP的研究

Study on High-speed Network Congestion Control Protocol

互联网正在逐步进入一种高带宽延时积的高速网络时代。当网络的带宽或者时延增大时,TCP协议的性能严重下降,最显著的就是网络瓶颈处带宽利用率很低。在高速拥塞控制方面比较理想的XCP协议却存在部署方面的问题。变结构拥塞控制协议(VCP)可有效地解决上述问题。VCP协议联合使用ECN机制的两个二进制来编码拥塞信息。根据来自接收端的拥塞信息,VCP协议的发送端选择控制算法来响应拥塞信号。仿真实验表明VCP协议与TCP协议、XCP协议相比不仅具有较高的链路利用率,并且对现有的协议改动非常小,有利于逐步地实施。

The Internet is shifting to the age of high-speed network, which is called as High Bandwidth-Delay product （BDP） network. TCP＇s performance degrades significantly as either bandwidth or latency increases. The most noteworthy aspect of this poor performance is the low bandwidth utilization in bottleneck. And XCP protocol has some applied problems. Variable-structure Congestion control Protocol （VCP） addresses this problem efficiently. VCP protocol en- codes congestion information with two binary bits in ECN. According to congestion information from receiver, the sender chooses control arithmetic to reply congestion signals. The paper indicates VCP protocol has high link usage,and it changes present protocol a bit. This is helpful to put VCP into practice.