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arXiv · 2301.12804

From ORAN to Cell-Free RAN: Architecture, Performance Analysis, Testbeds and Trials

Yang Cao·Ziyang Zhang·Xinjiang Xia·Pengzhe Xin·Dongjie Liu·Kang Zheng·Mengting Lou·Jing Jin·Qixing Wang·Dongming Wang·Yongming Huang·Xiaohu You·Jiangzhou Wang
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Abstract

Open radio access network (ORAN) provides an open architecture to implement radio access network (RAN) of the fifth generation (5G) and beyond mobile communications. As a key technology for the evolution to the sixth generation (6G) systems, cell-free massive multiple-input multiple-output (CF-mMIMO) can effectively improve the spectrum efficiency, peak rate and reliability of wireless communication systems. Starting from scalable implementation of CF-mMIMO, we study a cell-free RAN (CF-RAN) under the ORAN architecture. Through theoretical analysis and numerical simulation, we investigate the uplink and downlink spectral efficiencies of CF-mMIMO with the new architecture. We then discuss the implementation issues of CF-RAN under ORAN architecture, including time-frequency synchronization and over-the-air reciprocity calibration, low layer splitting, deployment of ORAN radio units (O-RU), artificial intelligent based user associations. Finally, we present some representative experimental results for the uplink distributed reception and downlink coherent joint transmission of CF-RAN with commercial off-the-shelf O-RUs.

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Yang Cao, Ziyang Zhang, Xinjiang Xia, Pengzhe Xin, Dongjie Liu, Kang Zheng, Mengting Lou, Jing Jin, Qixing Wang, Dongming Wang, Yongming Huang, Xiaohu You, Jiangzhou Wang. 2023-02-07. From ORAN to Cell-Free RAN: Architecture, Performance Analysis, Testbeds and Trials. https://arxiv.org/abs/2301.12804

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