一种适用于超密集网络下行链路的干扰抑制方案

An Interference Suppression Scheme for Downlink Ultra-dense Networks

在超密集网络(UDN)下行链路场景中,为了有效克服因节点间距减小、邻近节点传输损耗相差不大而产生多个强度相近的干扰源对用户性能的影响,提出了一种基于优先级以用户为中心的小区间干扰抑制方案。为了便于量化基站协作取得的带宽性能增益,采用了一种计算带宽盈亏率的定量分析指标。通过该指标,易于确定在特定UDN场景下干扰协调方案是否处于盈利状态,进而通过系统能够接受的最大损耗比优化参数配置。仿真结果表明,该干扰抑制方案能显著提升用户的信号干扰噪声比(SINR)性能,且能更好地保障用户公平性,有效地克服了用户SINR性能在基站数较多时受天线数限制的缺陷,为提升UDN网络用户性能和系统性能提供了一种解决方案。

In the downlink of an Ultra-dense Network(UDN),in order to effectively overcome the influence of similar-intensity interference which results from the decrease of the distance between nodes and the simi-larity of neighboring nodes’transmission loss on user performance,this paper proposes a priority-based user-centric interference coordination scheme.In order to quantize performance criteria of bandwidth gain a-chieved through the base stations cooperation,it proposes a performance criteria to compute the bandwidth loss-gain-rate.With the quantitative value of bandwidth loss-gain-rate,it is easily to learn whether the scheme is profitable in the UDN scene,and the parameters are optimized according to the largest acceptable loss ratio for the system.The simulation results show that the scheme can significantly improve user perform-ance and guarantee user fairness,efficiently overcoming the defect that user signal to interference pluse noise ratio(SINR)performance is restricted by the number of base stations’antennas under the condition of more base stations.The scheme presents a solution to improve users performance and system performance.