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- Title
Dynamic Scheduling and Power Allocation with Random Arrival Rates in Dense User-Centric Scalable Cell-Free MIMO Networks.
- Authors
Shin, Kyung-Ho; Kim, Jin-Woo; Park, Sang-Wook; Yu, Ji-Hee; Choi, Seong-Gyun; Kim, Hyoung-Do; You, Young-Hwan; Song, Hyoung-Kyu
- Abstract
In this paper, we address scheduling methods for queue stabilization and appropriate power allocation techniques in downlink dense user-centric scalable cell-free multiple-input multiple-output (CF-MIMO) networks. Scheduling is performed by the central processing unit (CPU) scheduler using Lyapunov optimization for queue stabilization. In this process, the drift-plus-penalty is utilized, and the control parameter V serves as the weighting factor for the penalty term. The control parameter V is fixed to achieve queue stabilization. We introduce the dynamic V method, which adaptively selects the control parameter V considering the current queue backlog, arrival rate, and effective rate. The dynamic V method allows flexible scheduling based on traffic conditions, demonstrating its advantages over fixed V scheduling methods. In cases where UEs scheduled with dynamic V exceed the number of antennas at the access point (AP), the semi-orthogonal user selection (SUS) algorithm is employed to reschedule UEs with favorable channel conditions and orthogonality. Dynamic V shows the best queue stabilization performance across all traffic conditions. It shows a 10% degraded throughput performance compared to V = 10,000. Max-min fairness (MMF), sum SE maximization, and fractional power allocation (FPA) are widely considered power allocation methods. However, the power allocation method proposed in this paper, combining FPA and queue-based FPA, achieves up to 60% better queue stabilization performance compared to MMF. It is suitable for systems requiring low latency.
- Subjects
CENTRAL processing units; MIMO radar; FRACTIONAL powers; SCHEDULING; ANTENNAS (Electronics)
- Publication
Mathematics (2227-7390), 2024, Vol 12, Issue 10, p1515
- ISSN
2227-7390
- Publication type
Article
- DOI
10.3390/math12101515