基于模糊逻辑的单速率组播拥塞控制机制  

A Fuzzy Logic-Based Single Rate Multicast Congestion Control Mechanism

作　　者：李欢[1] 孟相如[1] 郑博[1] 蒋静芝[1] 

机构地区：[1]空军工程大学电讯工程学院,陕西西安710077

出　　处：《计算机测量与控制》2010年第6期1319-1321,1325,共4页Computer Measurement &Control

基　　金：陕西省自然科学基金(SJ08F14)

摘　　要：分析了现有的单速率组播拥塞控制的优缺点,提出了一种基于模糊逻辑的单速率组播拥塞控制机制FSRMCC;在FSRMCC中接收端利用指数平滑预测模型预测期望速率,运用模糊判决器控制反馈信息的发送,减少反馈包的数量,发送端根据反馈信息通过模糊控制器及时调整发送速率,减少速率抖动;仿真表明,FSRMCC具有良好的TCP友好性、速率平滑性、响应性以及可扩展性,适用于流媒体组播业务的传输。The merits and shortcomings of existing single rate multieast congestion control mechanisms are analyzed respectively. Then a fuzzy logic--based single rate multicast congestion control mechanism （FSRMCC） is presented. In FSRMCC, each receiver forecast its expected rate by exponential smoothing prediction model. A fuzzy adjudicating controller is designed to control the sending of feedback information to decreasing the number of feedback packet. The sender adjusts sending rate in time to reduce the jitter of sending rate based on the feedback information from receivers by fuzzy controller. The simulations indicate that FSRMCC has well smoothness, TCP--friendliness, responsiveness and scalability, which make it a good choice for streaming media transportation.

关 键 词：组播 模糊控制 速率调节 预测 

分 类 号：TP393.04[自动化与计算机技术—计算机应用技术]