基于改进多属性判决的异构网络接入选择算法

摘要

针对现有多属性切换算法没有考虑所切换的目标网络负载、难以保障网络服务质量的不足,提出基于改进多属性判决的异构网络接入算法.首先,采用万有引力模型简化了复杂多属性判决算法的计算过程,减少了网络接入切换执行时间;其次,在切换执行前,通过加入负载判决模块计算出最优目标网络、次优目标网络负载,从而选出最终切换的目标网络.采用MATLAB和NS2等仿真工具,搭建了WLAN和UMTS融合的异构网络仿真环境.仿真结果表明,算法明显提高了整体网络的负载均衡度和资源利用率,有效降低了移动终端的切换阻塞率.%Aiming at the problem that the existing multi attribute handoff algorithm doesn't consider the load balancing of the target network and can not guarantee the quality of network service,the heterogeneous network access algorithm based on improved multi attribute decision was put forward.Firstly,the gravity model is used to simplify the complicated calculation process of multiple attribute decision algorithms,reducing the execution time of network access handoff.Secondly,the optimal target network and suboptimal target network load are calculated by adding the load decision module before switching,to select the final target handoff network.Using MATLAB,NS2 simulation tools,etc,a heterogeneous network simulation environment for WLAN and UMTS fusion was built.The simulation results show that the algorithm significantly improves the load balancing degree and resources utilization rate of the whole network,and reduces the handoff blocking rate of the mobile terminal effectively.