异构网络中基于用户划分的资源分配与功率控制方案

部署异构网络是提高移动通信系统容量至关重要的举措。然而宏基站的高发射功率会使得微蜂窝边缘用户受到严重的干扰；同时，微蜂窝周围的宏蜂窝用户由于靠近微基站将同样受到其所造成的干扰，因此这些用户应该受到保护。通过研究异构网络下行传输中的资源分配与功率控制策略，提出了一种基于用户划分的资源分配与功率控制方案。首先根据用户的信干噪比对用户进行分类，同时为受干扰严重的边缘用户划分保护频带。此外，通过动态地调整每个基站在保护频带上的传输功率，在不过度牺牲系统性能情况下减轻边缘用户的干扰。仿真结果表明，与传统方案相比，该方案能够有效抑制宏蜂窝和微蜂窝边缘用户的干扰并提高整个系统的吞吐量。

A resource allocation and power control strategy based on user partitioning in heterogeneous networks

Deploying heterogeneous networks is a key move to increase the capacity of mobile communication systems. However, the high transmit power of the macrocell base station can cause severe interference to the edge users of the microcell; at the same time, the macrocell users around the microcell base station can also be interfered by the proximity of the microcell base station, so these users should be protected. By studying the resource allocation and power control strategies in the downlink transmission of heterogeneous networks, we propose a resource allocation and power control strategy based on user partitioning. Firstly, the users are classified according to the ratio of signal interference to noise, and a guard band is designed for the edge users with severe interference. In addition, by dynamically adjusting the transmission power of each base station on the guard band, the interference on edge users is mitigated without sacrificing system performance. Simulation results show that compared with the traditional scheme, the proposed strategy can effectively suppress the interference on macrocell and microcell edge users and improve the throughput of the whole system.