混合频谱分配的三层异构网络覆盖概率分析

Coverage probability analysis of three-layer heterogeneous networks with hybrid spectrum allocation

针对城市环境热点区域业务密集化部署带来的流量激增问题,将微微基站和毫微微基站密集部署在宏基站之上以达到分流的效果,构建了一个三层簇异构网络模型。为有效抑制层内和层间传输的严重干扰,提出了一种基于簇分类的改进共享频谱分配方案。采用泊松簇过程和泊松洞过程对基站部署进行建模,详细描述了接收端精确的干扰统计特性,基于有效性准则给出了系统覆盖概率。同时还考虑了有序FBS级联方案和无序FBS级联方案2种情况。仿真结果验证了理论分析的正确性,揭示了网络参数对网络性能的影响。与无序FBS级联方案相比,有序FBS级联方案的性能增益很大程度上取决于PBS和FBS的覆盖半径。

Aiming at the problem of traffic surge caused by business intensive deployment in hot areas of urban environment,a three-layer cluster heterogeneous network model is constructed by densely deploying pico base stations and femto base stations on macro base stations to achieve the effect of diversion.To restrict the severe interference from inter-tier and intra-tier transmitters,an improved shared spectrum separation and allocation scheme is proposed based on cluster classification.The Poisson cluster process and the Poisson hole process are used to model the deployment of the base station,a statistical description of the interference experienced at a typical receiver is given,and then the coverage probabilities based on the validity criterion is derived.At the same time,two cascade cases such as ordered FBS association scheme and non-ordered FBS are considered.The simulation results verify the correctness of the theoretical analysis and reveal the influence of network parameters on network performance.It is concluded that,compared with non-ordered FBS association scheme,ordered FBS association scheme’s performance gain greatly depends on the coverage radii of PBS and FBS.