Spectrum sharing with terrestrial base stations (BSs) is a challenging topic in the field of wireless communications using high-altitude platform stations (HAPSs). In an existing approach based on a coordinated nullforming technique, interference signals of a HAPS are reduced through multiple nulls toward each terrestrial cell. However, a huge number of control parameters are shared between the HAPS and terrestrial BSs so that they can calculate the interference of HAPSs for resource allocation, which causes heavy load on backhaul networks. This study proposes an interference estimation model (IEM) for reducing the number of control parameters in the conventional coordinated nullforming scheme. In addition, a novel resource allocation algorithm for the terrestrial BSs based on the IEM is developed. Simulation results show that the signal-to-interference-plus-noise ratio of users in terrestrial cells achieved using the proposed scheme is equivalent to that of the conventional scheme. The proposed scheme reduces the number of control parameters shared with the terrestrial BSs to approximately 1/400th of the conventional scheme.
Coordinated Nullforming with Limited Control Parameters for Spectrum Sharing Between High-Altitude Platforms and Terrestrial Networks
2024-06-24
731140 byte
Conference paper
Electronic Resource
English
PROPULSION AND ALTITUDE CONTROL OPERATION INHIBITORS IN HIGH ALTITUDE PLATFORMS
European Patent Office | 2022
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