感知无线电是一个解决当前频谱资源紧缺情况的有效手段,其中动态频谱分配技术是一个非常重要的环节。文章首先建立了基于冲突图的需求分配模型,基于此模型提出了一种基于用户需求的动态频谱分配算法,在传统标签机制基础上增加了对感知用户随时间改变的频谱需求的支持。试验结果表明,当每个感知用户对频谱的需求随着时间的变化而变化并且为有限值的情况下,该算法能保证较好的公平性和提供较高的分配效率。 Perceiving radio is an effective solution to the current shortage of spectrum resources, of which dynamic spectrum allocation technology is a very important part. Firstly, the paper establishes a demand assignment model based on conflict graph. Based on this model, a dynamic spectrum allocation algorithm based on user needs is proposed. Based on the traditional label mechanism, the support for the spectrum requirement of perceiving users over time is added. The experimental results show that the proposed algorithm can ensure fairness and provide higher allocation efficiency when the spectrum demand of each perceived user changes with time and has a finite value.