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Jamming Coordination for Secure HAPS-Based Communication: A Joint Coverage and Secrecy Framework
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DOI：10.1109/tcomm.2026.3716991.png)
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Abstract
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This paper investigates physical layer security in high-altitude platform station (HAPS)-based wireless networks, where friendly jammers are cooperatively deployed in secrecy-vulnerable regions. Due to the large coverage area and line-of-sight nature of HAPS transmissions, legitimate transmissions are vulnerable to eavesdropping. To mitigate this vulnerability, we propose and analyze three practical jamming coordination schemes: 1) nearest jammer deactivation (NJD), which disables the closest jammer to each user; 2) region-based jammer deactivation (RJD), which deactivates all jammers within a fixed protection region; and 3) null-steering jammers (NSJ), which employ directional antennas to steer nulls toward legitimate users while jamming other directions. Using stochastic-geometry tools, we derive tractable expressions for key performance metrics: coverage probability, secrecy probability, joint coverage and secrecy probability, and average secrecy capacity. The proposed schemes are evaluated under varying network parameters and validated through extensive simulations. Our results reveal important trade-offs among the coordination schemes. NJD offers the strongest secrecy with minimal coordination overhead and hardware complexity but limited coverage. RJD maximizes coverage at the expense of secrecy with moderate coordination overhead, while NSJ achieves the best joint coverage and secrecy performance and the highest average secrecy capacity, particularly for larger protection regions and sufficient antenna null depth, but at the expense of higher coordination overhead and antenna complexity. These findings offer useful design guidelines for secure HAPS-enabled networks.
Keywords:
High-altitude platform station (HAPS)
friendly jammer
coverage probability
secrecy probability
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