LTE-Advanced异构网中载波选择与波束成形联合算法

Component Carrier Selection and Beamforming Jointly in LTE-Advanced Heterogeneous Network

为解决LTE-Advanced异构网内宏小区及微小区间的相互干扰问题,提出了载波选择与波束成形联合算法。在高密度、多低功率微基站节点的异构网中,通过关闭部分基站的部分载波,并在开启载波的基站天线上进行波束成形,使接收端受到的干扰大幅度降低。另外,基于效用函数的约束,对载波、波束分别计算,使原本二维联合优化问题变成两个一维优化问题,降低了算法复杂度。仿真结果表明该方案增加了异构网中边缘用户及整个系统的吞吐量。

To deal with the interference between macro cell and pico cell, or between pico cell themselves in LTE-Advaneed heterogeneous network, joint algorithm of component carrier selection and beamforming was proposed. By shutting down a subset of the component carrier in the dense low power node deployment scenario, it could remove lots of interference at the receive side. Additionally, based on utility function and calculate separately, algorithm reduced the dimensions and the searching complexity of the algorithm. Simulation results show that the proposed scheme can bring a great throughput gain of edge users and the whole system in the heterogeneous network.