基于SDN架构的垂直切换算法  

Vertical handover algorithm based on SDN architecture

作　　者：唐鑫 徐彦彦[1] 潘少明[1] 宋方振 TANG Xin;XU Yan-yan;PAN Shao-ming;SONG Fang-zhen(State Key Laboratory of Information Engineering for Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430000,China)

机构地区：[1]武汉大学测绘遥感信息工程国家重点实验室,湖北武汉430000

出　　处：《计算机工程与设计》2022年第5期1201-1206,共6页Computer Engineering and Design

基　　金：国家重点研发计划基金项目(2017YFB0504202);国家自然科学基金项目(91738302、41571426)。

摘　　要：针对当前大部分垂直切换算法采用分布式局部寻优策略,容易导致网络拥塞的问题,提出一种基于软件定义网络(softwaredefinednetwork,SDN)架构的垂直切换算法。利用SDN获得全局网络状态信息,设计模糊逻辑控制模型对网络多属性参数进行归一化决策处理与收益计算,结合二阶马尔可夫模型预测未来全局网络的实际状态,实现异构无线网络的集中控制与切换决策。实验结果表明,所提算法在节点移动的动态性条件下能获得较优的切换性能,可以满足异构无线网络通信的切换需求。In view of the problem that most current vertical handover algorithms adopt distributed local optimization strategy,which easily leads to network congestion,a vertical handover algorithm based on SDN(software defined network)architecture was proposed.SDN was used to obtain global network state information,a fuzzy logic control model was designed to normalize network multi-attribute parameters and calculate the benefits,and the actual state of the future global network was forecasted using the second-order Markov model,to realize the centralized control and handoff decision of heterogeneous wireless networks.Experimental results show that the proposed algorithm can achieve better handoff performance under the dynamic condition of node mobility,and can meet the handoff requirements of heterogeneous wireless network communication.

关 键 词：异构网络 垂直切换 模糊逻辑 马尔可夫模型 软件定义网络 

分 类 号：TN929.5[电子电信—通信与信息系统]