The Interference And Coexistence Study Of The 5G System With The Satellite Fixed Service

In order to meet the various requirements of continuous wide-area coverage scenario,high-capacity hot-spot scenario,low-latency high-reliability scenario and low-power massive-connection scenario,the frequency demand gap of 5G systems has increased significantly compared with the past,meanwhile,the existing low-band bandwidth resources are far from meeting their requirements.Considering the possibility of finding continuous large bandwidths in the high frequency range,a new agenda for World Radiocomunication Conferences 2019(WRC-19)was confirmed at the World Radiocomunication Conferences 2015(WRC-15).In order to increase spectrum allocation for mobile services and identify additional bands for IMT,WRC-191.13 issue was proposed and discussed which focuses on 11 potential candidate bands in the 24.25-86 GHz band and is aimed at looking millimeter wave band resources for the next step in the development of 5G systems.Based on the WRC-19 1.13 research framework and the compatibility analysis requirements for domestic IMT-2020(5G)candidate bands above 6 GHz,this thesis targets the interference coexistence study of the satellite fixed service with the IMT-2020(5G)system in 37.5-42.5 GHz band and 27.5GHz-29.5GHz band.This thesis begins with the introduction of the IMT-2020(5G)system,including the characteristics of the IMT-2020 system where the key technologies used,the classification of satellite systems and different satellite orbits,and the research methods of interference types and inter-system interference coexistence.With research and reference on ITU and 3GPP standards and recommendations,using Monte Carlo simulation method,I design and implement multiple simulation platforms for different coexistence scenarios,network topology,antenna model,link loss model.The above problems were studied in a number of different scenarios using a system-level simulation about the interference between the IMT-2020 system to the FSS earth station and the space station,that is,the downlink and uplink of the FSS respectively,and the interference results in multiple scenarios are obtained.In the study of IMT-2020 system interference to FSS space stations,satellites are classified into geosynchronous orbit(GSO)satellites and non-geosynchronous orbit(NGSO)satellites by orbital type.The former has a relatively static position that is easy to model,while the latter is difficult to model with time-varying modeling.This thesis uses the combination of the Systems Tool Kit(STK)satellite simulation tool and the Matlab simulation platform to make the latter's interference process accurately modeled.The research results show that the 5G systems in the above frequency bands can coexist well with the fixed-satellite service and have a certain interference margin.The relevant research results can provide technical basis for the future 5G system frequency planning and protection of satellite satellite fixed services in the millimeter wave band.