基于运动趋势的模糊逻辑垂直切换算法

随着无线异构网络的融合,移动性管理技术成为其关键问题,而切换管理又是移动性管理的重要部分。针对垂直切换管理提出了一种基于运动趋势的模糊逻辑垂直切换算法。算法分为预判定、模糊逻辑控制及切换判决3个过程。首先,在预判定阶段根据MN的运动趋势及接收信号强度滤除掉不适宜接入WLAN的网络信息,从而有效减少不必要的数据量和系统开销;其次,将接收信号强度、网络的可用带宽和网络开销送入模糊逻辑控制器,通过参数的归一量化最终得到网络综合性能值(VCPN);最后,通过综合考虑VCPN和驻留时间来进行网络切换判决。仿真结果显示,该算法能够有针对性地做出切换判决,有效消除乒乓效应,提高网络切换性能。

Fuzzy Logic Based on Motion Trend of Vertical Handoff Algorithm

With the development of heterogeneous wireless network,mobility management is one of the key issues,and handoff management is one of the most important issues in mobility management.Aiming at vertical handoff here presents a fuzzy logic based on motion trend of vertical handoff algorithm.The algorithm is divided into pre-determined,fuzzy logic control and handoff decision process.In the pre-determined procedure,according to the motion trends of MN and the received signal strength of WLAN to filter out the information which are not appropriate,reduce the amount of unnecessary data and system overheads.Then,put the RSS,network available bandwidth and the cost into the fuzzy logic controller,get the value of the final comprehensive performance of the network(VCPN) by normalizing.Finally making the decision according to VCPN and the dwell time.Simulation results show that the proposed algorithm can make the handover decision effectively,eliminate of ping-pong effects and improve the network switch performance.