I. Introduction
In Internet of Things (IoT), satellite communication systems have become a critical communication medium, which offers global coverage incorporating remote areas where traditional terrestrial networks fall short [1], [2]. Specifically, Low Earth Orbit (LEO) satellites are utilized for various IoT services such as IoT positioning, navigation, and environmental monitoring [3], [4], [5]. In the literature, several researches on channel allocation and spectrum utilization issues in satellite IoT are investigated. For example, Sanctis et al. [6] emphasized the importance of satellite communication systems for sensors and actuators in remote areas lacking terrestrial network connections. Obata and Takyu [7] explored interference detection techniques, assuming dynamic spectrum sharing between terrestrial and non-terrestrial communications. They propose a radio sensor to identify interference from ground systems with satellite earth stations. Hu et al. [8] proposed a solution for satellite IoT forward link multiplexing using high-order modulation to facilitate the transmission of different signals over the same frequency band simultaneously. However, higher-order modulation poses challenges for complex demodulation. Therefore, Yang et al. [9] designed a spectrum-sharing scheme based on soft frequency reassignment for satellite-ground integrated networks. Their slot allocation approach enhances spectral isolation and aims to optimize satellite spectrum utilization, albeit with increased interference. Although satellite communications have great potential, they are also facing a number of challenges, such as limited non-terrestrial spectrum resources, high transmission delays, and inter-satellite interference [10], [11].