TCP New Veno:一种改进的TCP拥塞控制机制  

TCP NEW VENO:A NOVEL MECHANISM FOR TCP CONGESTION CONTROL

作　　者：吴艳洁[1] 白光伟[1] 吴志刚[1] 

机构地区：[1]南京工业大学计算机科学与技术系,江苏南京210009

出　　处：《计算机应用与软件》2010年第2期22-24,84,共4页Computer Applications and Software

基　　金：国家自然科学基金项目(60673185);2006年度江苏省"青蓝工程"中青年学术带头人培养对象资助项目(苏教师20072)

摘　　要：TCP Veno协议通过对慢启动、拥塞避免和快速恢复的修改,改进了传统的TCP Reno的性能。然而,TCP的不公平性的问题仍然有待于解决。参与竞争的TCP流之间的不平衡可能造成某些通信源垄断队列空间。例如,当长RTT和短RTT流共存时,网络流量会逐渐集中于短RTT链路上。提出了一种新的TCP拥塞控制机制——TCP New Veno。其基本思路是通过引入带宽预测和动态窗口变化的思想进一步改进TCP Veno的性能,并导出其数学模型。数学分析和仿真实验都证明,改进后的算法在保证吞吐量的基础上提高了原算法的公平性。TCP Veno protocol improves the performance of traditional TCP Reno through modifying its slow start, congestion avoidance and fast recovery. However, significant TCP unfairness in MANETs is still an issue to be resolved. Some unbalanced situations among contending TCP sources may lead to part of sources monopolises the queue space. For example, the sources with shorter round trip delays link will gradually attract more network flow than the sources having higher delays when these two streams are coexisting. In this paper we propose a novel mechanism for TCP congestion control,i, e. TCP New Veno. The main idea of it is to introduce bandwidth prediction and dynamic window variation for further meliorating TCP Veno performance. The mathematical model of its mechanism is also deducted. Both mathematical analyses and simulations demonstrate that the improved algorithm can boost the TCP fairness significantly when still ensuring high throughput.

关 键 词：TCP Veno TCP公平性 带宽估计 

分 类 号：TP393.06[自动化与计算机技术—计算机应用技术] TN915.04[自动化与计算机技术—计算机科学与技术]