We propose a UAV-enabled Space-Air-Ground Integrated Network (SAGIN) to overcome the capacity and reliability limitations of traditional Direct-to-Cell communication. By using altitude-optimized UAV relays and realistic channel modeling, our framework significantly improves link reliability in disaster and remote scenarios. Simulation results using NVIDIA Sionna show up to 91.7% throughput gain with minimal latency degradation.
We propose a reliable and secure multicast transport protocol for Space–Ground Integrated Networks using a role-based access control (RBAC) mechanism. The protocol enhances security through role-based anomaly detection and improves reliability via backup intermediary activation during failures. Experimental results demonstrate improved throughput, low packet drop rate, minimal delay, and higher anomaly detection accuracy.