Interference Coexistence Study Of HIBS And IMT For WRC-23

At present,China’s communication system construction has been gradually improved,but in some remote rural,grassland,ocean and desert areas,limited by terrain conditions,technical difficulties,investment costs and other problems,it is difficult for the traditional land mobile communication system to play its advantages.At the same time,considering the high cost and high loss of satellite communication and other problems,deploying aerial base station becomes an effective means to realize full coverage of communication network.At the 2019 WRC Conference,Japan promoted HIBS as research topic 1.4 of WRC-23.In the global or regional scope,in the frequency band below 2.7GHz that has been identified as IMT’s,the research on the use of HIBS for mobile communication services is carried out,including the research on the coexistence of HIBS and terrestrial IMT’s.This thesis analyzes the isolation index of coexistence between HIBS and existing IMT systems in different frequency bands.Among them,the Adjacent Channel Interference Power Ratio(ACIR)for 900MHz is studied.The additional ACIR under different bandwidths was calculated.In the 1.8GHz/2.1 GHz frequency band,the two systems can coexist by increasing the isolation distance in space.This thesis mainly includes the following parts:(1)Study on co-frequency interference of 900MHz HIBS and 5G NR/LTE systems.The research scheme and simulation scenario of interference coexistence between two systems in this frequency band are proposed,and the ACIR of upstream and downstream links is analyzed.A platform based on Monte Carlo simulation method was developed to analyze the co-existence of the same frequency,and the simulation conclusion of ACIR required for the co-existence of two systems in different scenarios was obtained,and the isolation degree required for the co-existence of the same frequency was given according to the performance evaluation standard to support the standardization of China Unicom.(2)Study on co-frequency coexistence of HIBS and IMT systems in 1.8GHz/2.1GHz band.The simulation system architecture of HIBS jamming IMT is determined,and the simulation scenarios need to be studied are defined.According to 3 GPP and ITU related simulation parameters,a platform based on Monte Carlo simulation method was developed,the simulation curve was output and verified,and the conclusions under different pulling distances were obtained through simulation.According to the performance evaluation standards,the spatial isolation distance required to realize the coexistence of the same frequency was given to support the standardization of China Unicom.