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在异构无线网络的移动终端的垂直切换中,针对现有使用的自适应或直接搜索切换算法的精度低、计算量大等缺陷,提出一种基于粒子群优化(PSO)的垂直切换(VH)决策算法(PSOVH)。首先通过SEFI生成初始种群,然后利用PSO操作获得全局最优解。该方案能处理大量QoS参数,选择出最佳QoS权重,从而获得最优解,且能避免产生较大计算量。在不同数据集和用户偏好设置文件场景下进行实验,结果表明,相比其他方法,提出的方案能更加精确地搜索到最优解,且避免了高计算复杂度。
In the vertical handover of mobile terminals in heterogeneous wireless networks, aiming at the shortcomings of low accuracy and large amount of calculation of the existing adaptive or direct search handover algorithms, a particle swarm optimization (PSO) based vertical handover (VH Decision Making Algorithm (PSOVH). The initial population is generated by SEFI first, and then the global optimal solution is obtained by using the PSO operation. The scheme can handle a large number of QoS parameters, select the best QoS weight, so as to obtain the optimal solution, and can avoid a large amount of computation. Experiments under different data sets and user preference settings show that compared with other methods, the proposed scheme can search the optimal solution more accurately and avoid the high computational complexity.