UDP流量对TCP往返延迟的影响  

Effect of UDP traffic on TCP’s round-trip delay

作　　者：朱海婷[1] 丁伟[1] 缪丽华[1] 龚俭[1] 

机构地区：[1]东南大学计算机科学与工程学院江苏省计算机网络技术重点实验室,江苏南京211189

出　　处：《通信学报》2013年第1期19-29,共11页Journal on Communications

基　　金：国家重点基础研究发展计划("973"计划)基金资助项目(2009CB320505);国家科技攻关计划基金资助项目(2008BAH37B04)~~

摘　　要：提出一个面向单条链路的TCP综合传输性能测度R,分析其与同一时间粒度内链路的占用带宽和UDP流量比例间的关系,使用中国和美国2条主干信道的实测数据进行了检验。结果表明R测度可表示为以占用带宽和UDP流量比例为参数的正态分布的随机过程。随后进行的CERNET链路R测度正态分布均值参数的拟合分析具有很高的可接受水平,拟合的结果给出的量化关系可用于流量的公平性评价。A single link-oriented TCP transmission performance metric called ＂R＂ was proposed. The relationship be-tween metric R and two indicators （the utilized link bandwidth and the UDP traffic proportion） on the same link was ana-lyzed, and the experiment results on passive measurement datasets from two bidirectional network links separately lo- cated in USA and China were laid out. The results show that the metric R can be expressed as a normally distributed sto- chastic process with distinct parameters decided by the utilized bandwidth and the UDP traffic proportion. Further, by using fitting methods on local datasets, a concrete function, which was acceptable at a high confidence level, was given to describe the relationship between the mean value of R＇s normal distribution and the two indicators mentioned before. This work offers a reference to the study of network fairness.

关 键 词：TCP性能 UDP流量模型 流量公平性 往返时延 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]