采用部分频率复用的小小区网络建模与分析

小小区组网技术被认为是解决迅速增长的移动数据量需求的方法。然而，密集的小小区组网会导致严重的小区间干扰。传统的部分频率复用方法不能完全照搬用在部署不规则的小小区网络内，急需一种合理高效建模采用频率复用小小区网络的方法，对其性能进行评估。利用随机几何理论对小小区网络考虑部分频率复用场景进行建模，推导了考虑部分频率复用的小小区网络下行覆盖概率和网络吞吐量的表达式。数值仿真结果显示：部分频率复用技术可以提高小小区网络下行覆盖概率，但是会降低网络图吞吐量。在满足覆盖概率约束条件下，得到了使得网络吞吐量最大的频率复用因子的表达式。以上结果对未来采用频率复用技术的小小区组网的具体实施具有重要的指导意义。

Modeling and analysis of small cell networks with fractional frequency reuse

Small cell enhancement has been considered as a promising way to cope with the rapid growth of need for mobile data traffic. However,it also leads to severe inter-cell interference(ICI). Traditional fractional frequency reuse(FFR) can not be entirely applied to small cell scenario with irregular deployment and a reasonable and efficient method for modeling the network with frequency reuse is needed to evaluate its performance.This paper uses stochastic geometry theory to model small cell network considering FFR and derives the expressions of coverage probability and throughput of small cell network considering FFR. The simulation results show that the FFR can improve the downlink coverage probability of small cell networks but will decrease the throughput of small cell networks. Finally,it obtains the expression of optimal frequency reuse factor maximizing the throughput under some constrains of coverage probability. These results have important guiding significance for the implementation of small cell networks in the future.