异构网络中一种基于改进的TOPSIS的接入选择策略

It is very important that how to select a optimal network to access for both user and Operators in heterogeneous network environment. The academic community has proposed many algorithms to solve this problem recently, and the method of MADM（Multi Attribute Decision Making）is used widely for its simplicity and accuracy. MADM methods, however, known to suffer from ranking abnormalities. Also, the attribute value processed by MADM must be certain value. This paper applies improved TOPSIS（Technique for Order Preference Similarity to Ideal Solution）,a MADM algorithm, to the problem of network selection. Not only do the defuzzification the new method will, but also analyze the disorder causes and propose solutions. Through the numerical analysis, the algorithm proposed in this paper can be a good solution to the above two issues.