Advanced Mechanisms for Satellite and Terrestrial Co-existence in 26/28 GHz mmWave spectrum

Abstract

Availability of wide bandwidth makes mmWave spectrum in 26 and 28 GHz an attractive candidate for terrestrial cellular and satellite services. Dividing the spectrum into parts for each service proportionally shrinks the available resources for each service, thus co-existence of competing service in mmWave band is an indispensable subject to maximize usage of the spectrum. However, in the available literature co-existence has not been explored adequately for deployed technologies in satellite and terrestrial cellular communication. We have evaluated interference on satellite services in 26/28 GHz, which originates from the 5G terrestrial cellular network. To the best of our knowledge, for the first time in this paper, we have proposed interference mitigation mechanism for operating satellite communication in both space to earth (S-E) and earth to space (E-S) scenarios. In the S-E scenario, where 5G stations (base station and User Equipment (UE)) create interference on satellite earth stations, we have proposed applying (a) site shielding, and (b) beam nulling and power adaptation (BNAP) at 5G base stations to mitigate interference. In E-S scenario, where 5G stations create interference at the satellite space station, we have proposed applying (i) BNAP at the UE, (ii) Transmit Time Interval (TTI) bundling with reduced uplink transmission power at the UE, and (iii) localized deployment for the 5G base station to mitigate interference. Through extensive analytical modelling and simulations, we show that the proposed interference mitigation techniques can provide 10-20dB interference reduction and offer better co-existence for satellite and terrestrial services in the mmWave spectrum.