Interference-aware Resource Allocation and Inter-satellite Handover Management in Integrated Satellite Terrestrial Networks

The integrated satellite terrestrial network (ISTN) has the potential to provide global coverage and access by combining the advantages of satellite and terrestrial networks. However, the proliferation of low earth orbit (LEO) satellites leads to serious co-channel interference and frequent inter-satellite handover, resulting in the degradation of the downlink sum rate. To address this issue, we propose an interference-aware resource allocation and inter-satellite handover management scheme to maximize the downlink sum rate based on interference-aware insights. Neglecting inter-satellite handover will lead to reduced efficiency and increased complexity of resource allocation. Therefore, the integration of resource allocation and inter-satellite handover is leveraged to realize interference and handover management under the environment of network dynamic change. Different from static interference management which associates first and allocates later, our scheme performs interference aware according to channel state information and signal strength during resource allocation to make handover decisions to update connection relation and allocation strategy. To balance the capacity gain and handover times, we use the difference between the received signal and the interference signal strength as the handover threshold. Using simulations based on real satellite data, we demonstrate the effectiveness of the proposed algorithm in improving the downlink sum rate of ISTN.