Interference Analysis Between FSS and IMT-2020 at Extended C-Band

Abstract

IMT-2020 (5G) is a solution to addressing continuous increased in global data traffic. Amongst candidate bands to be allocated for IMT-2020 mid bands, the extended C-band (±3.5 GHz) becomes favorite due to its advantages in terms of both technology and economy. Thus, many countries identify it as one of the candidate bands for IMT-2020. In Indonesia, C-Band and extended C-band are primarily occupied by Fixed-Satellite Services (FSS) because of its robustness to heavy rain. This study investigates the feasibility for IMT-2020 and FSS systems to coexist in the extended-C band by analyzing the possibility of interference from IMT-2020 base stations to FSS earth stations using deterministic calculations. The calculations use FSS earth station and IMT-2020 base station trial parameters in Indonesia. The study results show that under any circumstances, co-channel scenario is very challenging since it requires very significant separation distance between the two systems. By employing off-axis angle of 50°, IMT 2020 base station need to be separated at least 78 km away from any FSS earth station. On the contrary, in the adjacent channel scenario, two systems are possible to coexist with a small protection distance (about 1 km) and a guard band of 10 MHz. The protection distance can be minimized by directing the IMT-2020 base station transmitting antenna away from the direction of the FSS earth station antenna.