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The recent development of high-altitude platforms (HAPs) has attractedincreasing attention since they can serve as a promising communication methodto assist satellite-terrestrial networks. In this paper, we consider anintegrated three-layer satellite-HAP-terrestrial network where the HAP supportdual-band connectivity. Specifically, the HAP can not only communicate withterrestrial users over C-band directly, but also provide backhaul services toterrestrial user terminals over Ka-band. We formulate a sum-rate maximizationproblem and then propose a fractional programming based algorithm to solve theproblem by optimizing the bandwidth and power allocation iteratively. Theclosed-form optimal solutions for bandwidth allocation and power allocation ineach iteration are also derived. Simulation results show the capacityenhancement brought by the dual-band connectivity of the HAP. The influence ofthe power of the HAP and the power of the satellite is also discussed.

Integrated Satellite-HAP-Terrestrial Networks for Dual-Band Connectivity