I. Introduction
To ensure the ubiquitous global coverage, the amalgamation of satellites and traditional networks is imperative for 5G-Advanced and even 6G systems [1], [2]. In particular, low earth orbit (LEO) satellites can provide lower service latency for delay-sensitive applications due to its lower orbital altitude, and as well higher data rate for bandwidth-sensitive services due to its larger constellation density [3]. Further, LEO satellites can improve the backhaul capability in base stations (BSs), and work as access points to offload tasks of ground terminals with worse channel conditions to BSs [4].