超密集网络中一种改进的分簇及资源分配方案

为了减少超密集网络中小区间的干扰，提出了一种改进的分簇及资源分配方案.首先，根据小基站间的路径损耗程度构造损耗图，基于损耗图选出簇头并且分簇，将路径损耗之和较小的小基站放在一个簇中，每个簇中小基站的数量不超过子信道的数量；然后，根据簇内的用户在每个子信道上的信干噪比依次为每个簇的用户分配正交的子信道；最后，优化功率分配，以提高吞吐量.仿真结果显示，与相同场景中的已有方案相比，所提方案更加均匀地将小基站分布在每个簇中，并且显著提高了系统吞吐量.

An Improved Clustering and Resource Allocation Scheme for Ultra-Dense Networks

An improved clustering and resource allocation scheme was proposed for ultra-dense network in order to reduce the interference among small cells. Firstly, a loss graph was constructed according to the path loss among the small base stations, and the cluster head was selected based on the loss graph. Small base stations with the smaller sum of path loss were divided into the one cluster in which the number of small base stations was no more than the number of subchannels. Then, orthogonal subchannels were allocated to users in each cluster according to the signal to interference plus noise ratio on each subchannel of each user in the cluster. Finally, power allocation was optimized to improve throughput. Simulation results show that compared with the existed schemes in the same scenario, the small base stations are more evenly distributed in each cluster, so that the system throughput is improved significantly.