提高边缘吞吐量的软频率复用改进方案研究

Research on Improved Scheme of Soft Frequency Reuse for Improving Cell-Edge Throughout

对于固定软频率复用算法在小区边缘用户分布不均匀时,无法动态地分配频率资源而造成系统整体频谱资源浪费的问题,提出一种动态软频率复用算法。在此算法中,以边缘用户在相邻小区间的分布为依据,将小区边缘频段进一步划分,将频率资源动态地分配给用户,分布较多边缘用户的小区将会分配到较多的频率资源,而分布较少边缘用户的小区就会分配到较少的资源。通过仿真可知,与固定软频率复用算法相比,动态软频率复用算法在几乎不影响中心用户吞吐量的同时提高了边缘用户的吞吐量。因此,动态软频率复用算法能够在小区边缘用户分布不均匀时,有效解决系统整体频谱资源浪费的问题。

In order to solve the problem that the fixed soft frequency reuse algorithm can not dynamically allocate frequency resources and wastes the overall spectrum resources of the system when users in the edge of the cell are unevenly distributed,an improved algorithm is proposed.In this algorithm,the cell edge frequency band is further divided,and frequency resources are dynamically allocated to users based on the distribution of edge users between adjacent cells.Cells with more edge users will be allocated more frequency resources,while cells with fewer edge users will be allocated less resources.The simulation results show that compared with the fixed soft frequency reuse algorithm,the dynamic soft frequency reuse algorithm improves the throughout of edge users while not affecting the central users throughout.Therefore,the dynamic soft frequency reuse algorithm can effectively solve the problem of waste of the overall spectrum resources of the system when users in the edge of the cell are unevenly distributed.