基于不变流形的FAST TCP参数选择方法  

FAST TCP Preference Method Based on Invariant Manifolds

作　　者：陈晓龙[1,2] 章云[1] 刘治[1] 杨玲玲[1] 

机构地区：[1]广东工业大学自动化学院,广州510090 [2]茂名学院计算机与电子信息学院,茂名525000

出　　处：《计算机科学》2010年第8期124-128,共5页Computer Science

基　　金：国家广东省联合基金(U0735003);国家自然科学研究基金项目(60604006);茂名学院自然科学研究基金资助

摘　　要：在各路径FAST TCP连接到达服从泊松过程、传送文件长度服从指数分布和瓶颈链路处于重流量服务强度的条件下,利用含有各路径FAST TCP连接平均逗留时间的Lyapunov函数,证明了若处于不变流形状态,则各路径活跃FAST TCP连接平均逗留时间最短,并且在有限的时间内系统可到达该不变流形。针对FAST TCP采用静态映射表确定协议参数α的缺陷,按照降阶的不变流形中连接数和协议参数的关系,提出了一种在慢时间尺度比例下根据连接数期望值和不变流形迭代搜索协议参数的方法。NS-2仿真结果表明该方法是有效的。When each route FAST TCP connections were assumed Poisson arrival and exponentially distributed document sizes, a Lyapunov function including FAST TCP connection＇s lingering time was constructed to prove that each route connection lingering time was shortest at the invariant manifolds under the heavy traffic service intensity, and to prove that the invariant manifolds were reached in a finite time. Aiming at the weakness of FAST TCP static mapping protocol parameter method, according to the relation between connection numbers and the protocol parameter in reduced order invariant manifolds, a slow timescale iterative search protocol parameter method based on the expected connection numbers and invariant manifolds was proposed. NS-2 simulationresults were presented to verify the effectiveness of this method.

关 键 词：参数选择 不变流形 重流量 服务强度 流模型 逗留时间 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]