多路径并行传输中传输路径选择策略

摘要

该文首先在实验分析的基础上,发现在互联网端到端传输层多路径并行传输(CMT)中,当端到端关联中路径间的特性参数如丢包率和延迟存在较大差异时,部分路径并行传输的吞吐量优于全部并行传输的吞吐量,从而论证了多路径并行传输情况下传输路径选择的必要性及对传输性能的影响.其次,建立了路径吞吐量与不同丢包率和延迟的拟合关系,并以路径吞吐量为路径权值,提出了一种基于路径权值的传输路径选择策略CMT-PW(Path Weight),给出了该策略的算法实现和相应的伪代码实现.仿真实验表明,CMT-PW策略优于传统CMT策略.%Based on experimental analysis, this paper firstly find that the throughput of concurrent partial path transfer is better than that of concurrent all path transfer when there are more difference of path characteristic parameters among paths in Concurrent Multipath Transfer (CMT) of Internet end-to-end transport layer, so, the necessity and influence of transmission path selection in Concurrent Multipath Transfer environment are discussed. Then, fitting relations to path throughput with a variety of loss rate and delay are establish. As path throughput to path weight, a transmission path selection strategy based on path weight (i.e., CMT-PW) is proposed, the realization of algorithm and pseudocode is given. The simulation reveals that CMT-PW policy outperforms than traditional CMT policy.