基于组合权重的异构无线网络选择算法

针对异构网络环境下网络选择算法采用单一方法确定判决指标权重存在的片面性问题,提出了基于组合权重的异构无线网络选择算法.首先根据用户需求建立判决矩阵,并进行层次分析,得到各判决指标的主观权重,同时对判决指标进行熵值处理,得到其客观权重;然后对主客观权重进行博弈均衡,确定指标的组合权重;最后对备选网络进行灰色关联分析,并运用组合权重对关联系数进行加权排序,得到最优接入网络.仿真实验证明:该方法能综合考虑多种接入判决指标,提高了异构网络中多模终端选择网络的准确性.

Heterogeneous wireless network selection algorithm based on combinational weight

In heterogeneous wireless network environments,there is a need to decide which network is the most suitable for each user at each moment for every application.To meet this demand,a network selection algorithm based on combinational weight is proposed.First,the analytic hierarchy process is applied to obtain the subjective weight of the network selection decision factor according to user demands.Then,the information entropy is used to decide the objective weight of the decision factor.To balance the subjective weight and the objective weight,a combinational weight is determined by using the game theory.After the selective networks are processed by the grey relational analysis,the optimum network could be selected according to the weighted grey relational degree.Simulation results show the algorithm can improve the accuracy of access selection for multi-mode terminals while balancing multiple decision criteria.