基于带宽测量拥塞控制分阶段慢启动改进机制

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。

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

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 multi-packet in the congestion windows has great decrease and the capability of the network transfer has been greatly improved.