异构无线网络中基于模糊逻辑的分级垂直切换算法  

A Hierarchical Vertical Handover Algorithm Based on Fuzzy Logic in Heterogeneous Wireless Networks

作　　者：马彬[1,2] 李尚儒 谢显中[1,2] MA Bin;LI Shangru;XIE Xianzhong((Institute of Computer Science and Technology,Chongqing University of Post and Telecommunications,Chongqing 400065,China;Chongqing Key Laboratory of Computer Network and Communication Technology,Chongqing University of Post and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学计算机科学与技术学院,重庆400065 [2]重庆邮电大学重庆市计算机网络与通信技术重点实验室,重庆400065

出　　处：《电子与信息学报》2020年第3期629-636,共8页Journal of Electronics & Information Technology

基　　金：重庆市教委科学技术研究重大项目(KJZD-M201900602);重庆市教委科学技术研究重点项目(KJZD-K201800603);重庆市基础研究与前沿探索项目(cstc2018jcyj AX0432);重庆邮电大学博士启动基金(A2015-16);重庆市研究生教育教学改革研究重点项目(yjg182024);重庆市高等教育教学改革研究项目(193095)~~

摘　　要：在异构无线网络中,针对综合考虑网络端和用户端参数的垂直切换算法,参数权重难以确定,同时基于模糊逻辑的垂直切换算法存在复杂度高的问题,该文提出一种基于模糊逻辑的分级垂直切换算法。首先,将接收信号强度(RSS)、带宽、时延输入到1级模糊逻辑系统,结合规则自适应匹配,推理出QoS模糊值,并通过QoS模糊值对网络进行初步筛选得到候选网络集;然后通过触发机制触发2级模糊逻辑系统,并将候选网络的QoS模糊值、网络负载率、用户接入费用输入2级模糊逻辑系统,同时结合规则自适应匹配,得到输出判决值,从而选择最佳接入网络。最后,实验结果表明,该算法能保证网络性能的同时,降低系统的时间开销。In the heterogeneous wireless networks, the parameter weight is difficult to determine for the vertical handover algorithm considering the parameters of the network and the user, at the same time, the vertical handover algorithm based on fuzzy logic has high complexity. Considering this problem, a hierarchical vertical handover algorithm based on fuzzy logic is proposed. Firstly, the Received Signal Strength(RSS), bandwidth and delay are input into the first-level fuzzy logic system. Combining with the rule adaptive matching, the QoS fuzzy value is inferred, and the network is initially filtered by the QoS fuzzy value to obtain the candidate network set;Then, the second-level fuzzy logic system is triggered by the trigger mechanism, and the QoS fuzzy value, network load rate and user access cost of the candidate network are input into the second-level fuzzy logic system. At the same time, the output decision value is obtained by combining the adaptive rule matching,so as to select the best access network. Finally, the experimental results show that the algorithm can guarantee the network performance while reducing the time cost of the system.

关 键 词：异构无线网络 模糊逻辑 复杂度 自适应规则匹配 触发机制 

分 类 号：TN915[电子电信—通信与信息系统]