基于非正交分簇的家庭蜂窝网络干扰协调方案

Interference mitigation scheme for femtocell network based on non-orthogonal clustering

为了进一步减小异构网络中家庭蜂窝之间的干扰,文中提出了一种改进型的基于分簇思想的子信道分配方案(EPAS),该方案首先通过测量相邻家庭蜂窝间的干扰权值来建立网路的干扰权重图,再根据干扰权重图将所有家庭基站划分进互相独立的簇,然后依据每个簇中包含的家庭蜂窝数量对每个簇进行子信道的分配,最后遍历每个簇中的所有用户,寻找每个用户可用的其他簇的资源,将该资源分配给用户。仿真结果表明,文中提出的算法能够在减小家庭蜂窝同层干扰的同时,提高频带资源的利用率和整个系统的吞吐量。

To further mitigate co-tier interference of femtocells in heterogeneous networks,an enhanced sub-channel allocation（ EPAS） scheme based on the clustering is proposed. The scheme contains four steps： 1） Constructing a weighted interference graph based on the measurement reports of adjacent femtocell. 2） According to the interference graph above,all the femtocells are divided into disjoint clusters. 3）Allocate sub-channels to each cluster with reference to the number of femtocells in the cluster. 4） Checking all femtocells in each cluster and search available resource in other cluster. If there is,allocate it to the femtocell. Simulation results show that the scheme can mitigate the co-tier interference and improve the system throughput at the same time.