基于部分频率复用的可调部分频率复用研究

虽然LTE系统中部分频率复用和软频率复用两种方法都可有效地避免小区间干扰，但当大量移动用户聚集在某小区中的某扇区时，可能导致该小区中不同扇区用户需求及其频谱资源分配产生严重的负载不平衡。改进的可调部分频率复用方法通过重新调整各扇区的频谱资源分配，寻找与相邻小区不同扇区间不相干扰的可用频谱资源来改善用户平均传输量及频谱资源的利用率，改善因负载不平衡所造成的频谱资源分配不均衡。从模拟仿真结果可知，可调部分频率复用方法在系统未达到满负载容量前较前两种频率复用方法更能有效改善用户平均传输量及频谱资源的利用率。

Study on adjustable fractional frequency reuse based on fractional frequency reuse

Although both methods of fractional frequency reuse and soft frequency reuse of the LTE system can effectively avoid the interference between zones, it may lead to user requirements and its frequency spectrum resource allocation in different sectors serious imbalance when large numbers of mobile users gather into a sector of certain cell. Improved adjustable fractional frequency reuse methods improve the user average throughput and spectrum resource utilization, improve the spectrum resource allocation imbalance because of unbalanced load caused through readjusting the sector of spectrum resource allocation and looking for available spectrum resources relationship between different sectors of neighboring cells. The simulation result shows that the adjustable fractional frequency reuse methods can more effectively improve the average user throughput and spectrum resource utilization before the system fails to reach the full load capacity compared with the previous two frequency reuse methods.