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This paper aims to develop satellite-user association and resource allocationmechanisms to minimize the total transmit power for integrated terrestrial andnon-terrestrial networks wherein a constellation of LEO satellites provides theradio access services to both terrestrial base stations (BSs) and thesatellite-enabled users (SUEs). In this work, beside maintaining thetraditional SatCom connection for SUEs, the LEO satellites provide backhaullinks to the BSs to upload the data received from their ground customers.Taking the individual SUE traffic demands and the aggregated BS demands, weformulate a mixed integer programming which consists of the binary variablesdue to satellite association selection, power control and bandwidth allocationrelated variables. To cope with this challenging problem, an iterativeoptimization-based algorithm is proposed by relaxing the binary components andalternating updating all variables. A greedy mechanism is also presented forcomparison purpose. Then, numerical results are presented to confirm theeffectiveness of our proposed algorithms.

LEO-to-User Assignment and Resource Allocation for Uplink Transmit Power Minimization