发表机构
New York University（纽约大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对上中频段O2I覆盖问题，提出PRIMO联合优化基站预编码、RIS相移与部署，经双频段射线追踪验证，FR3频段可多支持92%室内用户，最小速率提升90%，速度快百倍。
AI 中文摘要
上中频段频谱有望用于5G和6G蜂窝网络，然而在2 GHz以上，混凝土和低辐射玻璃会造成超过20 dB的建筑穿透损耗，从而降低室外到室内（O2I）覆盖。相邻建筑上的可重构智能表面（RIS）通过将能量聚焦到室内用户来绕过这一障碍。本文提出了PRIMO（并行RIS最小速率优化），一种无需训练的基础站预编码、RIS相移和RIS部署的联合优化器，并在纽约布鲁克林MetroTech Commons数字孪生中，于6.75 GHz和16.95 GHz频率下，通过校准的射线追踪进行了验证。在相同物理孔径下，半波长间距在FR3频段每阵列可容纳的元素数量是FR1(C)频段的6.25倍，因此在室内用户数较少时FR1(C)占优，而在用户数较多时FR3占优，此时额外的空间自由度抑制了用户间干扰。在1 bps/Hz服务底线以上，PRIMO在FR3频段比FR1(C)频段多支持92%的室内用户，并且与完全收敛的交替优化基线相比，将最小用户速率提高了最多90%，同时运行速度快约100倍。
英文摘要
Upper mid-band spectrum is promising for 5G and 6G cellular networks, yet concrete and low-emissivity glass impose over 20 dB of building penetration loss above 2 GHz, degrading outdoor-to-indoor (O2I) coverage. A reconfigurable intelligent surface (RIS) on a neighboring building bypasses this blockage by focusing energy onto indoor users. This paper introduces PRIMO (Parallel RIS Min-Rate Optimization), a training-free joint optimizer of base-station precoding, RIS phase shifts, and RIS placement, validated by calibrated ray tracing in a MetroTech Commons digital twin (Brooklyn, NY) at 6.75 and 16.95 GHz. At equal physical aperture, half-wavelength spacing packs 6.25 times as many elements per array at FR3 as at FR1(C), so FR1(C) leads at low indoor-user counts while FR3 dominates at higher counts, where the additional spatial degrees of freedom suppress inter-user interference. Above a 1 bps/Hz service floor, PRIMO supports 92% more indoor users at FR3 than at FR1(C), and raises the minimum user rate by up to 90% over a fully converged alternating-optimization baseline while running about 100 times faster.
Comments5 pages, 3 figures. Accepted at Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, USA, Oct. 25-28, 2026
