卫星互联网TCP拥塞控制算法  

TCP congestion control algorithm forsatellite internet

作　　者：林晓拔 林基明[1,2] 阎剑 王波 LIN Xiao-ba;LIN Ji-ming;YAN Jian;WANG Bo(School of Information and Communication Engineering,Guilin University of Electronic Technology,Guilin 541004,China;Wuzhou University,Wuzhou 543003,China;Key Laboratory of Electronic Information Control,Southwest China Research Institute of Electronic Equipment,Chengdu 610036,China;Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory,The 54th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang 050081,China)

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004 [2]梧州学院,广西梧州543003 [3]中国电子科技集团公司,第29研究所电子信息控制重点实验室,四川成都610036 [4]中国电子科技集团公司,第54研究所通信网信息传输与分发技术重点实验室,河北石家庄050081

出　　处：《计算机工程与设计》2018年第4期943-948,共6页Computer Engineering and Design

基　　金：广西自然科学基金项目(2014GXNSFAA118387)

摘　　要：为解决TCP Vegas拥塞控制算法无法适应卫星互联网场景的问题,分析该问题导致吞吐量性能降低的原因,提出一种基于链路长度计算结合带宽估计判决的Vegas-W算法。通过计算通信链路长度修正往返时延,结合带宽估计判决增加带宽竞争力,使Vegas拥塞控制算法在时延突变的情况仍保持较高吞吐量,适应卫星互联网星座动态环境特点。NS2仿真结果表明,Vegas-W算法相比Vegas算法在卫星互联网场景中吞吐量性能提高了40%,有效降低时延突变和带宽竞争不足给Vegas算法造成的不利影响。To solve the problem that the TCP Vegas congestion control algorithm can not adapt to the satellite network scene,leading to compromise the throughput performance,the causes of the problems were analyzed,and a Vegas-W algorithm based on link length calculation and bandwidth estimation was proposed.Round trip delay was fixed by calculating the length of the communication link and the bandwidth competitiveness was increased using the bandwidth estimation,which made the Vegas congestion control algorithm maintain the high throughput in the case of the delay mutation to adapt to the dynamic environment of the satellite Internet constellation.NS2 simulation results show that Vegas-W algorithm improves the throughput performance by 40%compared with the Vegas algorithm in the satellite Internet network,effectively reducing the adverse effects on the Vegas algorithm caused by delay mutation and bandwidth competition.

关 键 词：TCP传输控制协议 Vegas拥塞控制 卫星互联网 时延突变 带宽估计 

分 类 号：TN915.04[电子电信—通信与信息系统]