标题： 干扰最小化在5G异构网络中 显示英文标题

标题： Interference Minimization in 5G Heterogeneous Networks

摘要： 在本文中，我们关注的是代表性的5G网络场景之一，即多层异构蜂窝网络。 用户关联被研究以减少下行链路同频干扰。 首先，为了分析不同层级中的基站通常采用不同发射功率的多层异构蜂窝网络，我们提出了一种发射功率归一化模型（TPNM），该模型能够将多层蜂窝网络转换为单层网络，使得所有基站具有相同的归一化发射功率。 然后，利用TPNM，可以通过考虑等效单层蜂窝网络模型中的同一点来分析复杂多层环境中任意点接收到的信号和干扰，从而大大简化分析。 在此基础上，我们在异构蜂窝网络中提出了一种新的用户关联方案，其中从满足特定移动站服务质量（QoS）约束的候选基站集合中选择对其他同频移动站造成最小干扰的基站。 数值结果表明，与现有方案相比，所提出的用户关联方案能够在保持合理良好的QoS的同时显著降低下行链路干扰。 显示英文摘要

摘要： In this paper, we focus on one of the representative 5G network scenarios, namely multi-tier heterogeneous cellular networks. User association is investigated in order to reduce the down-link co-channel interference. Firstly, in order to analyze the multi-tier heterogeneous cellular networks where the base stations in different tiers usually adopt different transmission powers, we propose a Transmission Power Normalization Model (TPNM), which is able to convert a multi-tier cellular network into a single-tier network, such that all base stations have the same normalized transmission power. Then using TPNM, the signal and interference received at any point in the complex multi-tier environment can be analyzed by considering the same point in the equivalent single-tier cellular network model, thus significantly simplifying the analysis. On this basis, we propose a new user association scheme in heterogeneous cellular networks, where the base station that leads to the smallest interference to other co-channel mobile stations is chosen from a set of candidate base stations that satisfy the quality-of-service (QoS) constraint for an intended mobile station. Numerical results show that the proposed user association scheme is able to significantly reduce the down-link interference compared with existing schemes while maintaining a reasonably good QoS.