{"ID":2898975,"CreatedAt":"2026-06-01T04:54:23.091178241Z","UpdatedAt":"2026-06-01T04:54:23.091178241Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/2507.01289","arxiv_id":"2507.01289","title":"Fluid Aerial Networks: UAV Rotation for Inter-Cell Interference Mitigation","abstract":"With the rapid development of aerial infrastructure, unmanned aerial vehicles (UAVs) that function as aerial base stations (ABSs) extend terrestrial network services into the sky, enabling on-demand connectivity and enhancing emergency communication capabilities in cellular networks by leveraging the flexibility and mobility of UAVs. In such a UAV-assisted network, this paper investigates position-based beamforming between ABSs and ground users (GUs). To mitigate inter-cell interference, we propose a novel fluid aerial network that leverages ABS rotation to increase multi-cell capacity and overall network efficiency. Specifically, considering the line-of-sight channel model, the spatial beamforming weights are determined by the orientation angles of the GUs. In this direction, we examine the beamforming gain of a two-dimensional multiple-input multiple-output (MIMO) array at various ground positions, revealing that ABS rotation significantly affects multi-user channel correlation and inter-cell interference. Based on these findings, we propose an alternative low-complexity algorithm to design the optimal rotation angle for ABSs, aiming to reduce inter-cell interference and thus maximize the sum rate of multi-cell systems. In simulations, exhaustive search serves as a benchmark to validate the optimization performance of the proposed sequential ABS rotation scheme. Moreover, simulation results demonstrate that, in interference-limited regions, the proposed ABS rotation paradigm can significantly reduce inter-cell interference in terrestrial networks and improve the multi-cell sum rate by approximately 10\\% compared to fixed-direction ABSs without rotation.","short_abstract":"With the rapid development of aerial infrastructure, unmanned aerial vehicles (UAVs) that function as aerial base stations (ABSs) extend terrestrial network services into the sky, enabling on-demand connectivity and enhancing emergency communication capabilities in cellular networks by leveraging the flexibility and mo...","url_abs":"https://arxiv.org/abs/2507.01289","url_pdf":"https://arxiv.org/pdf/2507.01289v1","authors":"[\"Enzhi Zhou\",\"Yue Xiao\",\"Ziyue Liu\",\"Sotiris A. Tegos\",\"Panagiotis D. Diamantoulakis\",\"George K. Karagiannidis\"]","published":"2025-07-02T02:06:35Z","proceeding":"cs.NI","tasks":"[\"cs.NI\",\"eess.SP\"]","methods":"[]","has_code":false}