Joint power and frequency resource allocation algorithm for integrated satellite and terrestrial networks

In this paper, we propose a joint power and frequency allocation algorithm considering interference protection in the integrated satellite and terrestrial network (ISTN). We efficiently utilize spectrum resources by allowing user equipment (UE) of terrestrial networks to share frequencies with satellite networks. In order to protect the satellite terminal (ST), the base station (BS) needs to control the transmit power and frequency resources of the UE. The optimization problem involves maximizing the achievable throughput while satisfying the interference protection constraints of the ST and the quality of service (QoS) of the UE. However, this problem is highly nonconvex, and we decompose it into power allocation and frequency resource scheduling subproblems. In the power allocation subproblem, we propose a power allocation algorithm based on interference probability (PAIP) to address channel uncertainty. We obtain the suboptimal power allocation solution through iterative optimization. In the frequency resource scheduling subproblem, we develop a heuristic algorithm to handle the non-convexity of the problem. The simulation results show that the combination of power allocation and frequency resource scheduling algorithms can improve spectrum utilization.