| The 5th Generation Mobile Communication Technology(5G)has been widely deployed globally in recent years.Countries have prioritized deploying 5G New Ratio(NR)systems in the sub 6GHz frequency band.Due to the electromagnetic solid wave diffraction ability and mature modulation and demodulation equipment technology in the sub 6GHz frequency band,many communication systems have been deployed in this frequency band,making it difficult for 5G NR systems to allocate large continuous spectra.The millimeter wave frequency band currently needs to be developed and utilized,and many countries are considering deploying 5G NR systems in the millimeter wave frequency band in the future to fully utilize the potential of 5G NR systems.The unsynchronized network is a particular network deployment method in which the interfering and interfered systems do not need to be in both uplink and downlink states at each time slot.Unsynchronized networks are more flexible than synchronized networks.Like the sub-6GHz frequency band,The millimeter wave frequency band also has deployment requirements for unsynchronized networks.Currently,the millimeter-wave frequency bands with the most potential for priority use are the 26GHz frequency band and 40GHz frequency band.This paper researches these two frequency bands.Firstly,the characteristics of three single system deployment scenarios of 5G NR system in the millimeter wave frequency band,including outdoor macro station,outdoor micro station,and indoor micro station,were analyzed.Based on the possible scenarios the co-channel interference of the interfering system to the interfered system under different unsynchronized ratio conditions in the four deployment scenarios of outdoor macro-station to outdoor macro-station,outdoor micro-station to outdoor micro-station,outdoor macro-station to indoor micro-station,and indoor micro-station to indoor micro-station.Firstly,the system models of four interference coexistence scenarios are studied and analyzed,including the topology,path loss,antenna,power control,and interference evaluation models.Secondly,build a simulation platform according to the model indicators,and use the simulation platform to conduct a Monte Carlo simulation to study the interference of the interfered system under the 100%unsynchronized ratio and 50%unsynchronized ratio for the uplink and downlink,respectively.Finally,the simulation results suggest the isolation required for coexistence between systems. |
