基于快速链路动态感知的多路分流算法

Multi-path Splitting Algorithm Based on Fast Link Dynamic Awareness

多路并行传输技术的发展为解决实时视频低延时、高画质的业务需求提供了一种方法。现有的多路并行传输技术在某一路径发生丢包时,往往无法通过快速切换等手段,及时地将拥塞链路上的数据包进行重传或分流,如多路径传输协议(MPTCP)的快速重传机制需要三个相同的反馈数据包,无法保证实时视频的流畅性。为解决该问题,设计了一种基于用户数据报协议(UDP)的多路并行传输框架,并针对该框架提出了基于快速链路动态感知的多路分流算法。该算法综合考虑数据包到达特性,对链路网络状态进行建模,快速地感知链路状态并动态地调整链路重传切换时间。仿真结果表明,相比于超时判断分流决策,该算法能更准确地感知链路的质量和性能,并根据算法结果做出合理的数据分发决策,有效提升多路并行传输的性能,降低重传数据端到端时延,提高网络利用率。

The development of multi-path parallel transmission technology has provided a method to address the demands of low latency and high-quality real-time video services.However,existing multi-path parallel transmission technologies often fail to timely retransmit or redirect data packets on congested links in the event of packet loss on a particular path,such as the fast retransmit mechanism of MPTCP,which requires three identical ACK packets and cannot guarantee the smoothness of real-time video streaming.To address this issue,a UDP-based multi-path parallel transmission framework has been designed,and a multi-path splitting algorithm based on fast link dynamic awareness has been proposed for this framework.This algorithm comprehensively considers packet arrival characteristics,models the network state of the links,rapidly senses the link state,and dynamically adjusts the link retransmission and switching time.Simulation results demonstrate that compared to timeout-based splitting decisions,this algorithm can more accurately perceive the quality and performance of the links,make reasonable data distribution decisions based on algorithm results,effectively improve the performance of multi-path parallel transmission,reduce end-to-end retransmission latency,and enhance network utilization.