新型互联网传输控制协议拥塞控制的设计与实现

发布时间：2018-01-29 05:08

本文关键词： COTCP 公平性均衡拥塞拥塞控制　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：目前,TCP协议是传统互联网使用最多的传输控制协议。然而随着用户对网络需求的不断增长,单一路径的TCP传输协议已经暴露出不能适应网络发展的局限性。同时,接入技术的发展和接入方式的多样化也使得多路径并行传输技术成为了可能。北京交通大学依托标识网络研究设计了新型互联网面向连接的传输控制协议(COTCP),可支持多路径并行传输数据。本文分析和比较现有的多路径拥塞控制算法,并在此基础上分别从公平性、均衡拥塞、总体设计三个方面对COTCP拥塞控制进行了研究。在公平性方面,考虑到传统拥塞控制运用到COTCP时,COTCP用户会在共享瓶颈链路处对TCP用户造成N倍路径的侵占,引起资源公平问题。本文根据公平性问题提出了基于动态路径加权的拥塞控制算法(DWCC:Dynamic path Weighted Congestion Control)。DWCC算法能根据多路径传输的差异,动态改变各个子流的权重因子。保证了一个COTCP连接在共享链路瓶颈时与TCP连接竞争资源的公平性,实现网络资源的有效利用。在均衡拥塞方面,考虑到COTCP多链路在均衡拥塞时会产生网络不稳定现象,本文提出了基于链路数据评估的拥塞控制算法(LECC:Link data Evaluated Congestion Control)。该算法对于链路状态进行了精确的评估,能更好的调整拥塞控制窗口,有效地提高了网络的稳定性。最后介绍了 COTCP拥塞控制整体模块,为实现提供了理论基础。基于COTCP拥塞控制的设计,论文将拥塞控制算法在linux内核中加以实现,并且通过实验验证了COTCP拥塞控制算法的有效性,最后总结了 COTCP拥塞控制的总体内容,为后续研究提出了几个比较有意义的研究方向。
[Abstract]:At present, TCP protocol is the most widely used transmission control protocol in the traditional Internet. However, with the increasing demand of users for the network. The single path TCP transport protocol has exposed the limitations that can not adapt to the development of the network. At the same time. The development of access technology and the diversification of access methods make multipath parallel transmission possible. Beijing Jiaotong University has designed a new Internet Connection-Oriented Transmission Control Protocol based on the identification network. COTCP). This paper analyzes and compares the existing multipath congestion control algorithms, and on this basis respectively from the fairness, equilibrium congestion. The overall design of the three aspects of COTCP congestion control is studied. In fairness, considering the traditional congestion control used in COTCP. COTCP users will cause N-fold path encroachment on TCP users at shared bottleneck links. This paper presents a dynamic path-weighted congestion control algorithm based on the fairness problem. The DWCC:Dynamic path Weighted Congestion Control).DWCC algorithm can be based on the differences of multipath transmission. Dynamically changing the weight factor of each sub-stream, which ensures the fairness of competition between a COTCP connection and TCP connection when the link bottleneck is shared, and realizes the effective utilization of network resources. Considering that COTCP multi-links will cause network instability in equalization congestion. A congestion control algorithm based on link data evaluation is proposed in this paper. The algorithm evaluates the link state accurately. Can better adjust the congestion control window, effectively improve the stability of the network. Finally, the overall module of COTCP congestion control is introduced. Based on the design of COTCP congestion control, the congestion control algorithm is implemented in the linux kernel. The effectiveness of COTCP congestion control algorithm is verified by experiments. Finally, the overall content of COTCP congestion control is summarized, and several meaningful research directions are proposed for further research.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.04

【参考文献】