Basestation Choose and Power Allocation Aiming at Maximizing Energy-efficiency for Data Offloading LEO Satellite-ground Network

The low earth orbit (LEO) satellite constellation network can realize the global seamless coverage, and provide data offload services to remote areas, such as mountain areas. This paper considers a LEO satellite-ground network, in the network each user can choose a basestation equipped with a special antenna through C-band, and then the basestation will transmit the collected data to the LEO satellite through backhaul link over Ka-band, so as to realize the data offloading services for mobile users. We aim to maximize the system energy efficiency within the constraints of meeting the backhaul capacity determined by the LEO satellite backhaul link and the users minimum data rate requirements. The optimization problem is a nonconvex problem, which is solved by an iterative algorithm based on successive convex approximation(SCA). The final simulation results show that the proposed allocation scheme for data offloading transmission has higher system energy efficiency than the traditional access allocation schemes.