异构网络下基于混合保护子帧的干扰协调方案

增强型小区间干扰协调（enhanced inter cell interference coordination，eICIC)引入几乎空白子帧(almost black subframes，ABS)来降低异构网络中小区间的干扰，然而过多的ABS会损失宏蜂窝用户性能。为了提高异构网络的性能，联合考虑ABS和低功率几乎空白子帧(low power-ABS，LP-ABS)，提出了一种基于混合保护子帧(Hybrid Protected Subframes，HPS)的干扰协调方案。该方案综合考虑用户资源分配、HPS密度、HPS混合比例以及用户接入策略，以最大化系统比例公平效用为目标。仿真结果显示，所提方案在系统负载均衡、用户吞吐量以及用户公平性等指标上都优于传统增强型小区间干扰协调方案。

Interference coordination scheme based on hybrid protected subframes in heterogeneous networks

Enhanced inter cell interference coordination (eICIC) introduces almost black subframes (ABS) to reduce inter-cell interference in heterogeneous networks. However, excessive ABS can impair macrocell user performance. In order to improve the performance of heterogeneous networks, this paper proposes an interference coordination scheme based on hybrid protected subframes (HPS) considering both ABS and Low Power-ABS (LP-ABS) . The scheme takes into account the resource allocation, HPS density, HPS mixing ratio and user access strategy, in order to maximize the fairness of system proportion as the goal. Simulation results show that the proposed scheme is superior to the traditional enhanced inter-cell interference coordination schemes in terms of system load balancing, user throughput and user fairness.