超密集异构网络下的系统建模和时域干扰协调分析

采用基于随机理论的空间泊松点过程建立超密集异构网络的系统分析模型.在此模型下,通过分析异构网络中使用小区范围扩展技术和增强型小区间干扰协调技术引起的小区扩展区域和非扩展区域干扰类型不同的情况,分别推论出不同区域的中断概率和频谱效率等性能指标的表达式.针对异构蜂窝网络中存在几乎空白子帧(ABS)时,用户接入选择和资源分配方法过于复杂的情况,提出了一种动态分配几乎空白子帧算法.仿真结果表明:相较于固定几乎空白子帧算法,所提算法在兼顾各区域用户公平性的同时,可以使系统平均遍历容量提升10%~25%,同时也改善了扩展区域内的用户干扰问题.

Modeling of ultra-dense heterogeneous network and time-domain interference coordination analysis

A system analysis model for ultra-dense heterogeneous network is established using the space Poisson point process based on stochastic theory.In this model,by analyzing the interference types of the extended and non-expanded areas of the cell caused by the cell-wide extension technology and the enhanced inter-cell interference coordination technology in heterogeneous network,the expressions of performance indicators such as outage probability and spectrum efficiency in different regions are deduced.A method of dynamically allocating almost blank subframes(ABS) is proposed for the case when the user equipment access selection and the resource allocation methods are too complicated in heterogeneous networks with almost blank subframes.The simulation results show that compared with the fixed ABS algorithm,the proposed scheme can improve the average ergodic capacity of the system by 10%-25% while taking into account the fairness of the users in each area.It also improves the cross layer interference of extended region''s user.