Resource Management for Transmit Power Minimization in UAV-Assisted RIS HetNets Supported by Dual Connectivity
Ata Khalili, Ehsan Mohammadi Monfard, Shayan Zargari, Mohammad Reza., Javan, Nader Mokari, and Eduard A. Jorswieck

TL;DR
This paper introduces a resource management scheme for UAV-assisted RIS in HetNets, optimizing power and trajectory to reduce power consumption while maintaining QoS, using deep learning and convex optimization.
Contribution
It proposes a novel joint optimization framework for UAV trajectories, RIS phase shifts, and beamforming in HetNets supported by dual connectivity, employing deep Q-Networks and convex approximation methods.
Findings
Transmit power reduced by 6 dBm with UAV-RIS deployment.
Deep Q-Network effectively optimizes UAV trajectories and RIS phases.
Proposed scheme outperforms baseline resource allocation methods.
Abstract
This paper proposes a novel approach to improve the performance of a heterogeneous network (HetNet) supported by dual connectivity (DC) by adopting multiple unmanned aerial vehicles (UAVs) as passive relays that carry reconfigurable intelligent surfaces (RISs). More specifically, RISs are deployed under the UAVs termed as UAVs-RISs that operate over the micro-wave (W) channel in the sky to sustain a strong line-of-sight (LoS) connection with the ground users. The macro-cell operates over the W channel based on orthogonal multiple access (OMA), while small base stations (SBSs) operate over the millimeter-wave (mmW) channel based on non-orthogonal multiple access (NOMA). We study the problem of total transmit power minimization by jointly optimizing the trajectory/velocity of each UAV, RISs' phase shifts, subcarrier allocations, and active beamformers at each BS. The underlying…
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