Scalable Distributed User Scheduling for Low-Altitude Wideband Cell-Free RAN

Le résumé fourni par la source

This paper investigates scalable user scheduling in low-altitude, wideband cell-free radio access networks (CF-RANs), where scheduling is decentralized to user-centric distributed units (UCDUs), enabling scalable medium access control (MAC)-layer operation. Firstly, to provide analytical insights into the impact of distributed nature of CF-RAN, a closed-form expression for the uplink spectral efficiency (SE) is derived under zero-forcing (ZF) receiver implemented at edge distributed units (EDUs), revealing the performance degradation due to partial channel state information (CSI) availability. Next, we propose a three-level cooperation framework between the cloud central processing unit (CPU) and UCDUs to strike a balance among scheduling optimality, computational complexity, and fronthaul signaling overhead. This framework allows the system to dynamically adapt to varying network conditions and resource constraints. Furthermore, a low-complexity scheduling scheme based on large-scale fading is developed, enabling real-time operation without requiring matrix inversion. Numerical results validate the accuracy of the SE analysis and demonstrate that the proposed scheduling scheme achieves superior performance while significantly reducing computational complexity.

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