Efficient Transmission of Multi Satellites-Multi Terrestrial Nodes Under Large-Scale Deployment of LEO

In this paper, a novel uplink satellite-terrestrial network (STN) under the large-scale deployment of satellites is proposed to achieve efficient transmission of satellite-terrestrial data. In this network framework, spectrum utilization is improved by appropriate spectrum reuse and optimization to achieve matching transmission of multi terrestrial nodes (TNs) -multi satellite nodes (SNs). We formulate the optimization problem with maximizing system sum rate as optimization objective while considering TNs’ power and rate constraints. The original optimization problem is a highly non-convex optimization problem. We divide the optimization problem into node association subproblem and resource allocation subproblem, where resource allocation problem mainly includes channel allocation and power allocation. We propose a Matching and Lagrangian dual combination algorithm (MLCA) to solve the 0–1 combinatorial programming, wherein we use a matching algorithm and transform the original problem into convex subproblems via the Lagrangian dual method. Finally, simulation results are performed to verify the advantages of the proposed algorithm.