基于双向匹配模型的异构网络垂直切换算法

针对当前垂直切换判决算法存在的单一性，即切换判决时以用户或网络单方面为中心，没有充分考虑两者对切换判决的综合影响，导致垂直切换性能不佳的问题，该文提出一种基于双向匹配模型的垂直切换算法。该算法的主要思想是:首先分别以用户和网络为中心，设计各自的评估模型，用于评估双方对彼此的偏好顺序，并建立相应的排序值矩阵；其次利用排序值信息，基于一对多双向匹配模型对用户侧和网络侧的双向匹配行为进行建模和求解，以获得最优匹配解；最后根据最优匹配结果，进行垂直切换。仿真表明，该文设计的评估模型是合理的，并且所提出的算法能较好地兼顾用户侧的高性价比需求和网络侧的低阻塞率需求。

Two-sided Matching Model Based Vertical Handover Algorithm in Heterogeneous Wireless Networks

Most of the existing vertical handover algorithms are only based on user centric or network centric, which do not fully consider the common impact of the two sides on the handover decision. In order to solve this problem, a two-sided matching model based vertical handover algorithm in heterogeneous wireless networks is proposed. The handover performance is improved from the following aspects: first, two evaluation models of user centered and network centered are respectively proposed based on quality of service revenue and the blocking rate. And the ranking value of the two sides is evaluated further. Then, based on the ranking value, a one-to-many two-sided matching model is used to model the two-sided matching behavior of users and networks. In this way, users can access suitable networks. Simulation results show that the proposed evaluation models are in accordance with the practical network scenario, and the proposed algorithm can better balance the demand of users and networks.