基于带宽测量拥塞控制分阶段慢启动改进机制

A Phase-Divided Improvement Mechanism of the Congestion Control Slow Start Based on Bandwidth Measurement

用端到端实时在线网络带宽测量方法进行TCP拥塞控制慢启动改进算法的研究。TCP拥塞控制慢启动存在发送速率变化幅度大、网络性能低的问题。本文分析相关慢启动改进算法及其局限,结合端到端时延带宽模型分析,提出了端到端网络带宽测量方法,实现了基于带宽测量的分阶段平滑慢启动改进算法MP-start,得出了灵活慢启动参数模型并实现了自适应参数设置。仿真结果表明,拥塞窗口中多个分组丢弃概率大大降低,网络传输性能得到了明显改善。

Research on the TCP congestion control slow start algorithm improves the end-to-end bandwidth measurement on real-time line. The TCP congestion control slow start has a problem that the send-velocity change is great and the capability of the network is low. This paper analyses the limitation about the improved slow start algorithm and end-to-end delayed bandwidth model, then advances the end-to-end available bandwidth measurement methods and realizes an improved algorithm of phase-divided smooth slow start based on the bandwidth measurement, and gets a flexible slow-start parameter model, realizes the auto-adaptation parameter setting. The simulation results show that the lost probability of the multipacket in the congestion windows has great decrease and the capability of the network transfer has been greatly improved.