Joint Beam Hopping Scheduling and Power Allocation for Interference Management in LEO-GEO Coexisting Satellite Systems

Abstract

Low Earth Orbit (LEO) satellites are becoming increasingly vital as a complement to terrestrial networks for 6G, owing to the advantages of low latency, high capacity, and low launch cost. However, with the rapid increase in the number of LEO satellites, the limited spectrum resources are severely constraining the development of satellite communication networks. In particular, the co-frequency interference between LEO and Geostationary Earth Orbit (GEO) satellites needs to be carefully considered. We propose a joint beam hopping scheduling and power allocation scheme to achieve interference management in LEO-GEO coexisting satellite systems (CSSs). We flexibly design the beam hopping pattern and continuously optimize the power allocation, effectively enhancing the downlink data rate of the LEO system while guaranteeing the quality of service (QoS) of GEO users. Simulation results demonstrate that our proposed scheme achieves rapid convergence, reliably ensures the QoS of the GEO system, effectively maximizes the total downlink data rate of the LEO system, and exhibits potential for the applications in large-scale LEO-GEO CSSs.