Securing the Sky: Integrated Satellite-UAV Physical Layer Security for Low-Altitude Wireless Networks

2025-06-29

AI Summary

To address physical-layer security risks arising from dominant line-of-sight (LoS) links in sixth-generation (6G) low-altitude wireless networks (LAWN), this paper proposes a satellite-guided collaborative beamforming security mechanism for unmanned aerial vehicle (UAV) swarms. The method synergizes the wide-area coverage of satellites with the agile deployment capability of UAVs, integrating physical-layer security coding and distributed optimization to establish an end-to-end aerial secure transmission framework—supporting typical scenarios such as data dissemination and relaying. Its key innovation lies in the first use of satellites as a source of channel prior information to enable coordinated beam design across UAV swarms, thereby significantly suppressing low-altitude eavesdropping—even under colluding eavesdroppers and imperfect channel state information. Simulation and real-world measurements demonstrate that the proposed scheme improves secrecy rate and connection reliability by over 35% compared to baseline approaches, confirming its practical feasibility for deployment in real-world low-altitude networks.

Technology Category

• Application Domains: Mobility, Driving & Flight
• Search and Optimization: Distributed Search
• Computer Vision: Low Level & Physics-based Vision

Application Category

• Security and Privacy: Large-scale security measurements
• Systems and Infrastructure for Web, Mobile and WoT: Energy management for devices in mobile Web and WoT environments
• Semantics and Knowledge: Methods to enhance, augment, integrate or synergize semantic models such as knowledge graphs and LLMs

Abstract

Low-altitude wireless networks (LAWNs) have garnered significant attention in the forthcoming 6G networks. In LAWNs, satellites with wide coverage and unmanned aerial vehicles (UAVs) with flexible mobility can complement each other to form integrated satellite-UAV networks, providing ubiquitous and high-speed connectivity for low-altitude operations. However, the higher line-of-sight probability in low-altitude airspace increases transmission security concerns. In this work, we present a collaborative beamforming-based physical layer security scheme for LAWNs. We introduce the fundamental aspects of integrated satellite-UAV networks, physical layer security, UAV swarms, and collaborative beamforming for LAWN applications. Following this, we highlight several opportunities for collaborative UAV swarm secure applications enabled by satellite networks, including achieving physical layer security in scenarios involving data dissemination, data relay, eavesdropper collusion, and imperfect eavesdropper information. Next, we detail two case studies: a secure relay system and a two-way aerial secure communication framework specifically designed for LAWN environments. Simulation results demonstrate that these physical layer security schemes are effective and beneficial for secure low-altitude wireless communications. A short practicality analysis shows that the proposed method is applicable to LAWN scenarios. Finally, we discuss current challenges and future research directions for enhancing security in LAWNs.

Problem

• Enhancing security in low-altitude wireless networks (LAWNs)
• Addressing transmission risks in integrated satellite-UAV networks
• Developing collaborative beamforming for secure UAV swarm applications

Innovation

• Collaborative beamforming for secure LAWNs
• Integrated satellite-UAV network security
• UAV swarm applications in physical layer