Staggered Dynamic Spectrum Sharing for Integrated Satellite–Terrestrial Networks

Efficient spectrum sharing is a growing need in integrated satellite and terrestrial networks. However, spectrum sharing makes satellite bring severe interference to terrestrial networks. To solve this problem, we proposed a staggered dynamic spectrum sharing (SDSS) strategy, that is, downlink satellite networks use carriers occupied by uplink terrestrial networks. Based on SDSS, the base station addresses satellite-terrestrial interference independently, reducing the burden on satellite. Furthermore, the corresponding weighted sum rate problems are formulated, and the alternating optimization and selective signal extraction schemes are designed to solve problems. Simulations confirm that our approach achieves significant performance gains compared to baseline schemes.