Analysis of Interference from ATG Uplink to Terrestrial 5G Base Stations in 2.1 GHz Band

For the effective utilization of frequency resources, the ATG (Air to Ground, ATG) system is considered to be co-frequency multiplexed with the ground 5G system. In this paper, an inter-system coexistence analysis is conducted for the co-frequency interference situation between the 2.1 GHz band ATG system airborne terminal and the 5G system. The 2.1 GHz ATG airborne terminal parameters are used in the interference analysis, and the technical parameters of the 5G system in both rural and urban scenarios are considered. The interference isolation required for the coexistence of ATG airborne equipment with the ground-based co-channel 5G network is analyzed for different ATG aircraft flight altitudes and different horizontal distance scenarios, respectively. The analysis results show that the higher the aircraft flight altitude in the same scenario, the easier it is for the ATG system to coexist with the 5G system; at the same flight altitude, it is more likely for the ATG system to coexist with the 5G system in the urban scenario. Finally, by proposing some possible interference isolation measures to ensure the coexistence between systems is achieved.