一种改进的星地异构网络选择算法

Improved Algorithm of Satellite-to-Ground Heterogeneous Network Selection

针对目前异构网络选择算法在确定指标权重存在主观性的问题,提出一种改进的星地异构无线网络选择算法。将线性比例变换方法和极差变换方法结合,对网络属性值标准化处理,使处理结果更具科学性,采用10/10-18/2新标度系统构造判断矩阵,利用层次分析法计算网络性能差异的客观权重,通过对权重的排序,得到最优接入网络。仿真结果证明,该算法能有效改进传统多接入选择算法中对判决指标权重定义主观因素强,判决不准确的问题,提高了网络的选择准确性和有效性。

An improved algorithm of satellite-to-ground heterogeneous network selection was proposed in allusion to the subjectivity existing in the index weight decision of normal algorithms.The network attribute values were standardized with combinations of linear scaling transformation method and range transformation method,which made the results more scientific.The judgment matrix was built by 10/10 -18/2 new scale structure system.The subjective weights of indexes were calculated by AHP.Finally,the optimal access network was chosen through the weighted ranking of the relative membership degree.The results of simulation indicate that the algorithm improved the problem that the definition of judgment index weigh was too subjective and not accurate in traditional access selection algorithm and improved the accuracy and effectiveness in network selection.