\r章 辉¹，李 鸾¹，隋学铭^{1, 2}，吕沅宏\r¹\r
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AuthorsHTML:\r章 辉¹，李 鸾¹，隋学铭^{1, 2}，吕沅宏\r¹\r
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AuthorsListE:\rZhang Hui¹，Li Luan¹，Sui Xueming^{1, 2}，Lü Yuanhong\r¹\r
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AuthorsHTMLE:\rZhang Hui¹，Li Luan¹，Sui Xueming^{1, 2}，Lü Yuanhong\r¹\r
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Unit:\r\r1. 南开大学电子信息与光学工程学院，天津 300350；\r
\r\r2. 华为信息技术有限公司全球培训中心，杭州 310000\r
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Unit_EngLish:\r1. College of Electronic Information and Optical Engineering，Nankai University，Tianjin 300350，China；
2. Huawei Information Technology Co.，Ltd. Global Training Center，Hangzhou 310000，China\r
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Abstract_Chinese:\r在移动蜂窝网络信号衰落场景分析中，现有的标准路径损耗模型中信号随距离以单一的路径损耗指数衰减，这种情况过于理想化，会导致平均接收功率和干扰功率都与真实值之间存在数量级差异．在实际环境中，由于地面反射、遮挡物以及信号散射等物理特性，传播路径更为复杂，即使简单的双射线模型也会产生明显不同的路径损耗行为．随着5 G 的逐步商用，未来移动通信系统呈现出密集多层的异构网络架构特征，为了缓解日益紧张的无线频谱资源，毫米波受到关注．与传统的单路径损耗模型所不同的是，国外有关毫米波的外场传输实验表明，在视距和非视距范围内存在不同的路径损耗因子．而双重路径损耗模型采用分段幂律，不同距离范围受到不同路径损耗指数的影响，比标准路径损耗模型更贴近实际情况．研究中采用双重路径损耗模型，使用泊松点过程分析了瑞利信道衰落条件下的基站激活效应．仿真结果显示，关闭非激活基站可作为一种有效的干扰缓解方案，有效提高对覆盖概率、吞吐量等性能的影响，并且系统的干扰主要由活跃用户的密度限制．在关闭了非激活基站之后，用户密度与网络性能密切相关．\r
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Abstract_English:\rAbstract：When analyzing the state of signal fading scenarios in mobile cellular networks，the signal will attenuate with distance by a single path loss exponent in the current standard path loss model．However，this situation is too idealized，which will result in magnitude difference between the average received power and the true value and between the interference and the true value．In the actual environment，the propagation path is complicated owing to physical characteristics，such as ground reflections，occlusions，and signal scattering．Even a simple two-ray model will cause significantly different types of path loss behaviors．With the gradual commercialization of 5G，the future mobile communication system presents a dense multi-layered heterogeneous network architecture．Millimeter waves have attracted attention to alleviate the increasingly tight wireless spectrum resources．In contrast to the traditional single path loss model，foreign experiments on millimeter wave external field transmission show the presence of different path loss factors in the line of sight and non-line of sight．The dual-slope path loss model uses a piecewise power law，in which different distance ranges are affected by different path loss indices．As a result，this model is closer to the actual situation than the standard path loss model．In this research，using the dual-path loss model and then the Poisson point process were conducted to analyze the base station activation effect under Rayleigh channel fading conditions．The simulation results showed that turning off the inactive base station can be an effective interference mitigation solution to improve the impact of coverage probability as well as throughput effectively．In addition，the interference of the system is mainly limited by the density of active users．When turning off the inactive base station，the user density is closely related to the network performance．\r
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Keyword_Chinese:路径损耗；临界距离；衰落因子；激活因子；网络性能\r

Keywords_English:path loss；critical distance；fading factor；activation factor；network performance\r


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