HAPS-ISAC for 6G: Architecture, Design Trade-offs, and a Practical Roadmap

TL;DR

This paper proposes a HAPS-based integrated sensing and communication architecture for 6G networks, combining high-altitude platforms and UAVs to enhance performance, sensing, and coverage in large-scale environments.

Contribution

It introduces a novel HAPS-ISAC system architecture, analyzes design trade-offs, and provides a practical deployment roadmap for 6G applications.

Findings

Significant performance improvements over UAV-only systems

Enhanced sensing accuracy and network fairness

Feasible deployment strategies for smart city environments

Abstract

To meet the ambitious goals of next-generation 6G networks, including ultra-high data rates and ubiquitous coverage, we propose a novel high-altitude platform station (HAPS)-based integrated sensing and communication (ISAC) architecture. Operating in the stratosphere, the HAPS functions as both a powerful communication hub and an advanced environmental sensor. Combined with a fleet of cooperative uncrewed aerial vehicles (UAVs), this dual-purpose system forms a scalable and intelligent 3D network. Simulation results indicate that this approach significantly boosts network performance, improves sensing accuracy, and ensures a fairer service distribution across users, outperforming conventional UAV-only baselines. We conclude by outlining the prospective applications and a deployment roadmap for this technology for smart cities and other large-scale environments.