基于MPTCP耦合的自适应带宽估计算法  

Adaptive Bandwidth Estimation Algorithm Based on Coupling of MPTCP

作　　者：夏雨峰 占敖 吴呈瑜 王卉 XIA Yufeng;ZHAN Ao;WU Chengyu;WANG Hui(School of Information and Technology,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学信息学院,杭州浙江310018

出　　处：《无线电通信技术》2022年第2期336-341,共6页Radio Communications Technology

基　　金：国家自然科学基金(61801430);浙江理工大学基本科研业务费专项资金资助(2020Q021)。

摘　　要：多路径TCP(MultiPath TCP,MPTCP)协议既能满足用户对数据高速传输的需求又具有较高的稳定性,故提出一种基于MPTCP耦合的自适应带宽估计算法(Adaptive Bandwidth Estimation Algorithm Based on Coupling of MPTCP,ABEC-MPTCP)。为保证链路在瓶颈处的公平性,在慢启动阶段采用了子流耦合的拥塞控制算法,再根据时间间隔内传输数据量的平均值来估算当前链路的平均带宽,对平均带宽做平滑处理,从而使得拥塞避免阶段的慢启动阈值更加合理,因此提高链路的吞吐量以及稳定性。仿真结果表明,在保证子流瓶颈处公平性的情况下,耦合的自适应带宽估计算法相比Westwood算法带宽估计值更加趋近平稳和接近理想带宽值,网络链路的吞吐量提高40%左右,提高了对网络带宽的利用率。MultiPath TCP protocol proposed in recent years to meet user demand for high⁃speed data transmission and high stability,propose an adaptive bandwidth estimation algorithm based on coupling of MPTCP(ABEC⁃MPTCP).First of all,to ensure the fairness of the links at the bottleneck,a subflow coupled congestion control algorithm is used during slow start phase.The average link bandwidth is estimated,according to the average value of the amount of data transmitted in the time interval.And then average bandwidth is smoothed.In congestion control stage,slow start threshold is more reasonable.Therefore,the throughput and the stability of the link are improved.Simulation results show that,this bandwidth estimation algorithm is more stable than the Westwood algorithm,and closer to the ideal bandwidth value.The throughput of the network link is increased by about 40%.At the same time,it shows that the algorithm improves the utilization of network bandwidth.

关 键 词：子流耦合 带宽估计 拥塞控制 多路径传输 公平性 

分 类 号：TP915.04[自动化与计算机技术]