Transactions of Nanjing University of Aeronautics & Astronautics
Cell Breathing Scheme for Mega-Constellation Satellite Networks
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Abstract:
Low earth orbit （LEO） mega-constellations can provide global low-latency high bandwidth coverage compared to the terrestrial network. The time-varying topology of satellite networks and the uneven traffic distribution lead to the mismatch between satellites and users， resulting in the waste of satellite resources and the degradation of user performance. Through negotiation with neighbors， the traditional terrestrial cell breathing continuously converges to the optimal cell size in the face of user tides， but this method is difficult to converge timely when facing rapid and extreme flow changes caused by the rapid movement of satellites. This paper presents a fast adaptive cell breathing scheme （FaB） through sub-block division and satellite cell initialization and adjustment. FaB divides the ground into sub-blocks according to the user density. When the satellite moves in the same sub-block， the step size of breathing is adjusted according to the cell size difference between the previous satellite and the current satellite. When the satellite switches between different sub-blocks， the initial value of the cell is determined according to the density of the new sub-block. In addition to negotiating with neighboring satellites， this scheme also introduces location information to directly adjust the parameters of cell breathing and decrease the time of cell breathing convergence. From the real constellation data-driven simulation， we conclude that FaB can quickly adjust the size of the cell with the location changing， and the utilization rate is increased by 2.66 times compared to the method with no cell breathing， and by 2.37 times compared to the method with cell breathing without location information.
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This work was supported by the National Key Research and Development Plan of China （No.2018YFB1800301）； the National Natural Science Foundation of China （No.62132009）； the Youth Fund of National Natural Science Foundation of China （No.61902214）； and the Tsinghua University-China Mobile Communications Group Co.，Ltd. Joint Institute. The authors would like to acknowledge the following people for their assistance： LI Yuanjie， LAI Zeqi， WU Qian.
Clc Number:
TP293
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