【摘要】 基于国内运营商运用地面系统自有资源部署HIBS系统，为未来国内HIBS与地面系统的同频部署提供参考。首先根据3GPP相关协议建立系统模型，包括拓扑与传播模型等内容，参考相关协议给出ACIR计算方案，其次采用蒙特卡洛仿真方法对900 MHz频段HIBS与5G NR在同频时的干扰情况进行了研究，最后给出同频共存所需隔离度。仿真结果显示，只有HIBS终端干扰5G NR基站不需要额外隔离度，其他场景均需要5-30 dB的额外隔离度。更多还原

【Abstract】 Based on the deployment of HIBS system by domestic operators using their own resources of the ground system, this paper provides a reference for the future co-frequency deployment of domestic HIBS and ground systems.Firstly, the system model is established according to 3GPP related protocols, including topology generation, user generation and inter-system propagation models. In the topology generation, the single-system topology and two-system coexistence topology of HIBS and 5G NR are described, respectively. Specifically, 5G NR adopts the traditional three-sector structure, and HIBS adopts the seven-sector structure where the seven sectors are presented in the deployment mode of two-layer cells. The coexistence topology adopts the co-coverage scenario with more stringent coexistence requirements, and thus the additional isolation required for coexistence is higher and the conclusion is more accurate in this case. The air-ground propagation models introduced in 3GPP TR38.811 and ITU-R P.1409 are investigated in this paper, respectively, where the specific usages of the two models are described and compared.Secondly, the uplink and downlink ACIR between the two systems is analyzed emphatically. The bandwidth of the HIBS system is 20 MHz, each uplink subframe has three users, and each downlink subframe has one user. Two types of 5G NR system bandwidth are considered, i.e., 5 MHz and 10 MHz, and the users in each uplink/downlink subframe are the same as in HIBS. Referring to the protocol 3GPP 36.942, the uplink ACIR is determined by the terminal ACLR, and the downlink ACS is 0 because the single user occupies all the bandwidth. In the uplink, HIBS terminal causes the interference to 5G NR base stations and 5G NR terminal causes the interference to HIBS base stations, however, due to the different uplink interference systems, the bandwidth of the interfering system is different, and thus the calculation method is different for 5G NR and HIBS. Specifically, when the bandwidth of the interfering system is larger than that of the terminal in the interfered system, the interfered system terminal suffers part of the interference power in the interfering system. When the bandwidth of the interfering system is smaller than that of the interfered system terminal, the interfered system terminal is affected by multiple parts of ACLR. In order to facilitate understanding, the combination of graph and formula is adopted to briefly introduce the ACIR calculation process and give the relevant results. Finally, Monte Carlo simulation method is used to analyze the interference of 900 MHz HIBS and 5G NR in the same frequency band and the simulation conclusion is given. In this study, there are eight different simulation cases based on the combination of different 5G NR system bandwidth(5 MHz/10 MHz), different propagation models(3GPP TR38.811/ITU-R P.1409) and different simulation scenarios(urban/rural). The co-existence results of these eight cases are provided in this paper. The additional isolation required is given when two systems deployed in the same area cannot achieve co-frequency coexistence. Simulation results show that in the co-area deployment, only HIBS terminals interfering with 5G NR base stations can achieve co-existence at the same frequency and do not require additional isolation, while other scenarios require additional isolation of 5-30 dB.更多还原