一种异构无线网络的多属性垂直切换方案

为满足在异构无线网络中的用户对不同业务的需求,减少无线网络垂直切换所造成的乒乓效应,给出了一种异构无线网络的多属性垂直切换方案.该算法采用模糊逻辑对网络进行预判决,给出切换的代价函数以选择最佳网络,代价函数中采用了层次分析法来确定不同业务情况下信噪比,时延以及价格和用户偏好等参数的权重.针对WiMAX和UMTS网络重叠覆盖的环境所进行的仿真表明,该算法能够在满足用户需求的条件下有效地减少切换次数和功率消耗.

A multi-attribute vertical handoff scheme for heterogeneous wireless networks

In order to meet the user demand for different services as well as to mitigate the Ping-pong effect caused by vertical handoff for wireless network,a multi-attribute vertical handoff scheme for heterogeneous wireless network is proposed. In the algorithm,a fuzzy logic method is used to make pre-decision. The optimal handoff target network is selected by a cost function of network which uses an Analytic Hierarchy Process to calculate the weights of SNR,delay,cost and user preference in different business scenarios. Simulation is performed in the environment which is overlapped by WiMAX and UMTS networks. Results show that the proposed approach can effectively reduce the number of handoff and power consumption in a condition to satisfy the user needs.