基于状态确认的卫星链路拥塞控制算法研究  

Research on Congestion Control Algorithm of Satellite Link Based on State Confirmation

作　　者：关世杰[1] 王国靖 GUAN Shijie;WANG Guojing(Shenyang Ligong University,Shenyang 110159,China)

机构地区：[1]沈阳理工大学信息科学与工程学院,沈阳110159

出　　处：《沈阳理工大学学报》2023年第4期15-18,25,共5页Journal of Shenyang Ligong University

基　　金：辽宁省“兴辽英才计划”项目(XLYC1902095);辽宁省自然科学基金指导计划项目(2019-ZD-0255);沈阳市中青年科技创新人才支持计划项目(RC200386)。

摘　　要：卫星通信中使用传统通信协议Vegas算法进行拥塞控制时,由于无法识别丢包的原因和位置,导致不能充分利用链路带宽,吞吐量降低。为此,提出一种基于状态确认的拥塞控制算法CD-Vegas,在数据传输过程中能够实时判断拥塞可能发生的位置,使得发送端对时延变化做出准确判断,及时调整拥塞窗口,预防并控制拥塞的发生。文中基于OPNET软件设计仿真模型并搭建卫星网络通信所需环境,以吞吐量和丢包率为评估指标,验证算法可行性。仿真结果显示,峰值吞吐量提高11%,最高丢包率降低7‰,有效减少反向拥塞对链路传输效率的影响。In satellite communications,the link bandwidth can not be fully utilized and the throughput is reduced because the cause and location of packet loss cannot be identified when the traditional communication protocol Vegas algorithm is used for congestion control.To solve this problem,a congestion control algorithm CD-Vegas based on state confirmation is proposed.By judging the possible location of congestion in real time during data transmission accurate judgment on delay change can be made by the sending side to adjust the congestion window in time and prevent and control congestion.Based on OPNET simulation software,a simulation model is designed and the required environment for satellite network communication is built,the throughput and packet loss rate are used as evaluation indicators to verify the feasibility of the algorithm.The simulation results show that the peak throughput is increased by 11%,and the maximum packet loss rate is reduced by 7‰,the impact of reverse congestion on the link transmission efficiency is effectively reduced.

关 键 词：卫星通信 Vegas算法 反向拥塞 吞吐量 丢包率 

分 类 号：TN927.2[电子电信—通信与信息系统]