QoE驱动的SDN网络高可用传输框架  

QoE-driven High-availability Transmission Framework for SDN

作　　者：陈晨[1] 庄毅[1] 高增 CHEN Chen;ZHUANG Yi;GAO Zeng(College of Computer Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210000,China)

机构地区：[1]南京航空航天大学计算机科学与技术学院,江苏南京210000

出　　处：《计算机与现代化》2023年第11期62-68,74,共8页Computer and Modernization

基　　金：国家自然科学基金资助项目(61572253)。

摘　　要：针对复杂环境下单路传输可用性低且路径切换代价高的问题,本文提出一种用于高可用性传输服务的QoE驱动和SDN辅助MPTCP路径切换方案(QoE-driven and SDN-assisted MPTCP Path switching Scheme,QESMPS)。首先根据SDN架构下数据平面节点的介数中心性构建具有路径不相交的路径规划模型。其次采用双阶段策略分别执行带宽补偿与路径切换,加快传输受阻路径上子流的转移,实现以较低的吞吐量完成路径切换。最后,将Levy飞行引入到AOA模型更新中,防止算法过早收敛,增强跳出局部最优的能力,从而保证算法在对子流路径权重进行优化时达到最优。实验结果表明,本文提出的方法在执行子流路径切换时具有吞吐量波动范围更小、延迟更低以及抖动更小的优势。此外,改进AOA算法在计算最优权值向量时可获得更高的收敛效率。For the problem of low availability and high cost of path switching for single-path transmission in complex environments,this paper proposes a QoE-driven and SDN-assisted MPTCP path switching scheme for high-availability transmission services.Firstly,a path planning model with path disjoint is constructed based on the mesoscopic centrality of data plane nodes in SDN architecture.Secondly,a two-stage strategy is used to perform bandwidth compensation and path switching separately,the transfer of subflows on the transmission blocked path is accelerated to achieve path switching with lower throughput.Finally,Levy flight is introduced into the model update of AOA to prevent the algorithm from converging prematurely and enhance the ability to jump out of the local optimum,thus ensuring that the algorithm is optimal when optimizing the subflow path weights.Experimental results show that the method proposed in this paper has the advantages of smaller fluctuation range of throughput,lower delay and less jitter when performing sub-stream path switching.In addition,the improved AOA algorithm can obtain higher convergence efficiency when calculating the optimal weight vector.

关 键 词：软件定义网络 QOE 多路传输 带宽补偿 算术优化算法 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]