Low-Delay Broadband Satellite Communications with High-Altitude Unmanned Aerial Vehicles

다국어 초록 (Multilingual Abstract)

The large number of users and the long propagation delayof communication satellites make it difficult to deploy a randomaccess scheme that performs well in terrestrial networks. The aimof this paper is to demonstrate that a relay architecture with unmannedaerial vehicles (UAV) between the ground and satellitescan facilitate satellite access with a low overhead. We considera TDMA-based two-level relay structure, in which users transmitdata to UAVs through a random access scheme, and the UAVs forwardit to the satellite with either a coordinated or uncoordinatedaccess scheme. We show that the coordinated access for the UAVto-satellite links can substantially improve the throughput and delayperformance. We conclude that a proper scheme for resourceallocation between ground-to-UAVs and UAVs-to-satellite is criticalto optimize the relay network, which includes the UAV altitude,and should be based on traffic demand and the number of UAVsdeployed.

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