Interference Evaluation Between HAPS and Neighboring HAPS Considering Overlapped Ground Service Coverage

A High Altitude Platform Station (HAPS) is known as one of the promising solutions that can enlarge service coverage of current mobile communication systems. We evaluate interference in the overlapped ground service coverage deployed by HAPS and neighboring HAPS operating on the typical spherical cap. The probability of interference is derived based on various parameters such as the distance between the typical ground user and neighboring HAPS, the distance (i.e., arc length) between HAPS and neighboring HAPS on the spherical cap, and the elevation angle and the Earth-centered zenith angle of neighboring HAPS. Numerical results demonstrate the impact of these parameters on interference probability, highlighting the need for careful consideration in deploying both HAPS in the air and their ground service coverage.