基于多属性判决的网络选择算法

Network Selection Algorithm Based on Multi-attribute Decision

异构网络中,针对如何根据不同业务的特性选择合适的判决参数并利用这些参数来选择最适合的网络以及通过网络负载均衡来减少切换次数和切换失败可能性等问题,提出了一种基于多属性判决的网络选择算法——TAU-MADM算法。考虑到网络客观属性和用户偏好,进行两次判决:第一次判决采用TOPSIS算法,仅考虑网络客观属性,当备选网络方案相当接近时进行第二次判决;第二次判决采用AHP算法计算权重,并采用ANP网络分析法消除属性之间的依赖性,之后构造效用函数,根据每个网络的效用函数值进行网络选择。仿真结果表明,该算法考虑了网络负载均衡,有效地降低了平均切换率和平均切换阻塞率。

A network selection algorithm based on multi-attribute decision for heterogeneous networks was proposed according to how to choose and use the right parameters to select the most appropriate network on the characteristics of different services,considering the network load balancing to reduce handoff times and the probability of handoff blo- cking. This algorithm takes the network objective attributes and user preferences into account. Two decisions are made. The first decision uses TOPSIS algorithm, considering only the network objective attributes. When the alternative net- work solutions are very close, the second decision is made. The second decision uses AHP to calculate the weights and uses ANP to eliminate the dependenee between the attributes, then creates utility functions, and selects the most appro- priate network on the values of the utility functions. Simulation results show that the proposed algorithm take5 the net- work load balancing into consideration and reduces the average handoff rate and the average probability of handoff blo- eking effectively.