Two Millimeter-Wave Base Station Cooperation Technologies in High-Mobility Environments for 5G Evolution

2020 IEEE 91st Vehicular Technology Conference (VTC2020-Spring) Pub Date : 2020-05-01 DOI:10.1109/VTC2020-Spring48590.2020.9129102

Tatsuki Okuyama, S. Suyama, Nobuhide Nonaka, Y. Okumura, T. Asai

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引用次数: 5

Abstract

Commercial services in 5G have already started all over the world. The initial 5G introduces analog beamforming (BF) by Massive MIMO (M-MIMO) to compensate for the larger path-loss in millimeter-wave (mmW) bands such as 28 GHz. In 5G Evolution (5GE) that is expected to be realized for around 2025, the analog BF will be replaced with hybrid or fully digital BF to improve mmW-band downlink/uplink transmission performances. In addition, new radio access technologies are required for 5GE to provide stable and reliable cell-edge transmission in the mmW bands, even when mobile stations (MSs) travel in high mobility. This paper proposes two mmW base station cooperation technologies that are inter-baseband unit (inter-BBU) and intra-BBU cooperation for the hybrid BF. The former exploits two M-MIMO antennas in two BBUs connected to one central unit by limited-bandwidth fronthaul, and the latter cooperates two M-MIMO antennas connected to one BBU with Doppler frequency shift compensation. Computer simulations verify that the intra-BBU cooperation can achieve an excellent transmission performance in cases of two and four MSs moving at a velocity of 90 km/h.

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面向5G演进的高移动性环境下两毫米波基站协同技术

5G的商业服务已经在全球范围内开始。最初的5G通过大规模MIMO (M-MIMO)引入模拟波束形成(BF)，以补偿毫米波(mmW)频段(如28 GHz)中较大的路径损耗。在预计将于2025年左右实现的5G演进(5GE)中，模拟BF将被混合或全数字BF取代，以提高毫米波频段下行/上行传输性能。此外，5GE需要新的无线电接入技术，以便在毫米波频段提供稳定可靠的蜂窝边缘传输，即使移动站(MSs)在高移动性下运行也是如此。本文提出了两种毫米波基站合作技术，即混合BF的基带间单元(inter-BBU)和基带内单元(intra-BBU)合作。前者利用两个电池中的两个M-MIMO天线通过有限带宽前传连接到一个中心单元，后者利用多普勒频移补偿将两个M-MIMO天线连接到一个电池。计算机模拟验证了在2个和4个电池以90 km/h的速度移动的情况下，电池内部的合作可以实现出色的传输性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2020 IEEE 91st Vehicular Technology Conference (VTC2020-Spring)

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