Tech Brief: Full-Domain Simulation Evaluation Model for 5G and C-Band FSS Spectrum Coexistence

Large-scale dense deployment of global 5G base stations leads to frequent spectrum overlap interference between 3.4–3.8 GHz 5G bands and 3.7–4.2 GHz C-band FSS satellite services. Interference intensity varies greatly with deployment distance, base station power and antenna tilt, while traditional empirical evaluation methods cannot accurately predict on-site interference risks. The industry has established a full-domain simulation evaluation model for 5G and C-band FSS coexistence to realize quantitative analysis and scenario prediction of spectrum interference.

This model accurately simulates space-terrestrial spectrum coupling interference under diverse geographical scenarios, equipment parameters and networking conditions, and quantifies the impact thresholds of 5G adjacent-channel interference and RF spurs on VSAT/FSS terminal SNR, link margin and bit error rate. It also evaluates the applicability of four mainstream suppression solutions including filtered LNBs, spatial isolation, base station power control and digital compensation, providing standardized selection criteria for different interference levels. It delivers accurate data support for global satellite terminal compliance upgrades, base station planning and spectrum management, effectively improving the coexistence stability and deployment compliance of C-band satellite and terrestrial 5G networks.