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为保证业务的连续性,移动节点在异构无线网络间需要进行无缝垂直切换,针对现有基于服务质量(QoS)切换算法的搜索精度低、计算时间长且不能处理大量QoS参数等缺陷,提出一种融合模拟退火(SA)算法的改进型权重组合快速搜索(SEFI)算法:SA-SEFI。首先,根据具体应用,利用SEFI获得多个QoS参数权重组合的较优解,然后利用SA算法获取最优解,最后根据最优参数权重组合计算每个网络QoS参数的适应度来决定切换策略。实验结果表明,SA-SEFI能够精确的搜索最优解、计算量小且能够处理多达6个QoS参数。
In order to ensure the continuity of the service, the mobile node needs seamless vertical handover between heterogeneous wireless networks. In view of the defects of the existing search quality based on the quality of service (QoS) switching algorithm, low computation accuracy, long computation time and unable to handle a large number of QoS parameters, This paper proposes an improved Fast Combination Search (SEFI) algorithm based on Simulated Annealing (SA) algorithm: SA-SEFI. First of all, according to the specific application, we use SEFI to obtain the optimal solution of multiple QoS parameter weight combinations, and then use SA algorithm to obtain the optimal solution. Finally, the fitness of each network QoS parameter is calculated according to the optimal parameter weight combination to decide the switching strategy. The experimental results show that SA-SEFI can search the optimal solution exactly, with less computation and can handle up to 6 QoS parameters.