卫星网络中基于BaseRTT计算的TCP Vegas算法改进  

Improvement on TCP Vegas Algorithm Based on BaseRTT Computation in Satellite Network

作　　者：潘成胜[1,2] 宣景朋[1,2] 魏德宾[1,2] 杨力[1,2] 

机构地区：[1]辽宁省通信网络与信息处理重点实验室,辽宁116622 [2]大连大学信息工程学院,辽宁116622

出　　处：《系统仿真学报》2012年第6期1254-1258,共5页Journal of System Simulation

基　　金：国家863计划项目(2009AAXX);辽宁省教育厅创新团队(2009T004)

摘　　要：传统的TCPVegas是一种基于测量的拥塞控制算法,并没有考虑通信节点移动的情况。针对卫星间距离变化对往返时延的影响较大,以及带宽分配的不公平性问题,提出一种基于最小往返时延计算的拥塞控制算法Vegas_Sat(Vegas over Satellite)。该算法根据卫星间的距离计算出最小往返时延,据此进行拥塞控制,提高了网络的资源利用率,改善了带宽分配的不公平性问题。最后,利用NS2的仿真软件验证了算法的有效性。TCP Vegas is a measurement-based congestion control algorithm,it does not consider the communication node movement.To overcome the changes of delay due to the satellite movement,and the problem of malapportioned bandwidth,Vegas_Sat algorithm was proposed for the satellite network.The new algorithm calculated the Base_RTT using the distance between the communicate satellites to congestion control.The Vegas_Sat improved network resource utilization and the problem of malapportioned bandwidth.Finally,the validity of the new algorithm was verified by NS2 simulation software.

关 键 词：拥塞控制 TCP VEGAS 卫星网络 最小往返时延 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]