CPU-Cooperative Power Control Scheme for Scalable Cell-Free Massive MIMO Systems
- Title
- CPU-Cooperative Power Control Scheme for Scalable Cell-Free Massive MIMO Systems
- Author
- 조성현
- Keywords
- cell-free massive MIMO; CPU edge region performance; CPU cooperation; max-min power control; scalability
- Issue Date
- 2024-06-11
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Citation
- IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, page. 1-16
- Abstract
- Cell-free massive multiple-input multiple-output (CF-mMIMO) can provide uniformly great service to user equipment (UE) by utilizing a large number of distributed access points (APs) connected to a single central processing unit (CPU). For addressing scalability and feasibility issues inherent in single-CPU CF-mMIMO systems, multiple-CPU CF-mMIMO (MC-CF-mMIMO) has been considered. However, the MC-CF-mMIMO system inevitably encounters performance degradation at the boundary area of the CPUs, referred to as the CPU edge. Cooperation among CPUs can improve the performance in the CPU edge region; however, scalability problems resurface owing to inter-CPU information sharing during the cooperation process. In this study, we propose a scalable CPU cooperation scheme that focuses on power control to address the performance degradation issue in the CPU edge region. Initially, we propose a policy estimation scheme for other CPUs to reduce the overhead of information sharing. Based on these estimated policies, each CPU can independently derive power control policies for the max-min optimization problem without simultaneous information sharing. Simulation results show that the proposed power control scheme achieves a performance improvement of up to 4.3234 dB in terms of CPU edge region performance and minimum spectral efficiency compared to baseline schemes based on the degree of CPU cooperation.
- URI
- https://ieeexplore.ieee.org/document/10552910https://repository.hanyang.ac.kr/handle/20.500.11754/191238
- ISSN
- 1536-1276; 1558-2248
- DOI
- 10.1109/TWC.2024.3405585
- Appears in Collections:
- COLLEGE OF COMPUTING[E](소프트웨어융합대학) > COMPUTER SCIENCE(소프트웨어학부) > Articles
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