The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
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O sistema de comunicações móveis de quinta geração (5G) introduziu inicialmente múltiplas entradas múltiplas e saídas massivas (M-MIMO) com formação de feixe analógico (BF) para compensar a maior perda de caminho em bandas de ondas milimétricas (mmW). Para resolver um problema de cobertura e apoiar a alta mobilidade das bandas mmW, tecnologias de cooperação de estação base (BS) foram investigadas em ambientes de alta mobilidade. No entanto, trabalhos anteriores assumem um cenário de estação móvel (MS) e BF analógico que não suprime a interferência entre MSs. A fim de melhorar o desempenho do sistema nas bandas mmW, o BF totalmente digital que inclui pré-codificação digital deve ser empregado para suprimir a interferência mesmo quando os MSs viajam em alta mobilidade. Este artigo propõe duas tecnologias de cooperação mmW BS que são unidade inter-banda base (inter-BBU) e cooperação intra-BBU para o BF totalmente digital. A cooperação inter-BBU explora duas antenas M-MIMO em duas BBUs conectadas a uma unidade central por fronthaul de largura de banda limitada, e a intra-BBU coopera duas antenas M-MIMO conectadas a uma BBU com compensação de mudança de frequência Doppler. Este artigo verifica a eficácia das tecnologias de cooperação BS por meio de simulações computacionais e testes experimentais ao ar livre. Primeiro, mostra-se que a cooperação intra-BBU pode alcançar um excelente desempenho de transmissão nos casos de dois e quatro MSs movendo-se a uma velocidade de 90km/h por meio de simulações computacionais. Em segundo lugar, os ensaios experimentais ao ar livre esclarecem que a cooperação inter-BBU mantém o rendimento máximo numa área mais ampla do que a cooperação não-BS quando apenas um MS se move a uma velocidade máxima de 120 km/h.
Tatsuki OKUYAMA
NTT DOCOMO, INC.
Nobuhide NONAKA
NTT DOCOMO, INC.
Satoshi SUYAMA
NTT DOCOMO, INC.
Yukihiko OKUMURA
NTT DOCOMO, INC.
Takahiro ASAI
NTT DOCOMO, INC.
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Tatsuki OKUYAMA, Nobuhide NONAKA, Satoshi SUYAMA, Yukihiko OKUMURA, Takahiro ASAI, "Base Station Cooperation Technologies Using 28GHz-Band Digital Beamforming in High-Mobility Environments" in IEICE TRANSACTIONS on Communications,
vol. E104-B, no. 9, pp. 1009-1016, September 2021, doi: 10.1587/transcom.2020FGP0013.
Abstract: The fifth-generation (5G) mobile communications system initially introduced massive multiple-input multiple-output (M-MIMO) with analog beamforming (BF) to compensate for the larger path-loss in millimeter-wave (mmW) bands. To solve a coverage issue and support high mobility of the mmW bands, base station (BS) cooperation technologies have been investigated in high-mobility environments. However, previous works assume one mobile station (MS) scenario and analog BF that does not suppress interference among MSs. In order to improve system performance in the mmW bands, fully digital BF that includes digital precoding should be employed to suppress the interference even when MSs travel in high mobility. This paper proposes two mmW BS cooperation technologies that are inter-baseband unit (inter-BBU) and intra-BBU cooperation for the fully digital BF. The inter-BBU cooperation exploits two M-MIMO antennas in two BBUs connected to one central unit by limited-bandwidth fronthaul, and the intra-BBU cooperates two M-MIMO antennas connected to one BBU with Doppler frequency shift compensation. This paper verifies effectiveness of the BS cooperation technologies by both computer simulations and outdoor experimental trials. First, it is shown that that the intra-BBU cooperation can achieve an excellent transmission performance in cases of two and four MSs moving at a velocity of 90km/h by computer simulations. Second, the outdoor experimental trials clarifies that the inter-BBU cooperation maintains the maximum throughput in a wider area than non-BS cooperation when only one MS moves at a maximum velocity of 120km/h.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2020FGP0013/_p
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@ARTICLE{e104-b_9_1009,
author={Tatsuki OKUYAMA, Nobuhide NONAKA, Satoshi SUYAMA, Yukihiko OKUMURA, Takahiro ASAI, },
journal={IEICE TRANSACTIONS on Communications},
title={Base Station Cooperation Technologies Using 28GHz-Band Digital Beamforming in High-Mobility Environments},
year={2021},
volume={E104-B},
number={9},
pages={1009-1016},
abstract={The fifth-generation (5G) mobile communications system initially introduced massive multiple-input multiple-output (M-MIMO) with analog beamforming (BF) to compensate for the larger path-loss in millimeter-wave (mmW) bands. To solve a coverage issue and support high mobility of the mmW bands, base station (BS) cooperation technologies have been investigated in high-mobility environments. However, previous works assume one mobile station (MS) scenario and analog BF that does not suppress interference among MSs. In order to improve system performance in the mmW bands, fully digital BF that includes digital precoding should be employed to suppress the interference even when MSs travel in high mobility. This paper proposes two mmW BS cooperation technologies that are inter-baseband unit (inter-BBU) and intra-BBU cooperation for the fully digital BF. The inter-BBU cooperation exploits two M-MIMO antennas in two BBUs connected to one central unit by limited-bandwidth fronthaul, and the intra-BBU cooperates two M-MIMO antennas connected to one BBU with Doppler frequency shift compensation. This paper verifies effectiveness of the BS cooperation technologies by both computer simulations and outdoor experimental trials. First, it is shown that that the intra-BBU cooperation can achieve an excellent transmission performance in cases of two and four MSs moving at a velocity of 90km/h by computer simulations. Second, the outdoor experimental trials clarifies that the inter-BBU cooperation maintains the maximum throughput in a wider area than non-BS cooperation when only one MS moves at a maximum velocity of 120km/h.},
keywords={},
doi={10.1587/transcom.2020FGP0013},
ISSN={1745-1345},
month={September},}
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TY - JOUR
TI - Base Station Cooperation Technologies Using 28GHz-Band Digital Beamforming in High-Mobility Environments
T2 - IEICE TRANSACTIONS on Communications
SP - 1009
EP - 1016
AU - Tatsuki OKUYAMA
AU - Nobuhide NONAKA
AU - Satoshi SUYAMA
AU - Yukihiko OKUMURA
AU - Takahiro ASAI
PY - 2021
DO - 10.1587/transcom.2020FGP0013
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E104-B
IS - 9
JA - IEICE TRANSACTIONS on Communications
Y1 - September 2021
AB - The fifth-generation (5G) mobile communications system initially introduced massive multiple-input multiple-output (M-MIMO) with analog beamforming (BF) to compensate for the larger path-loss in millimeter-wave (mmW) bands. To solve a coverage issue and support high mobility of the mmW bands, base station (BS) cooperation technologies have been investigated in high-mobility environments. However, previous works assume one mobile station (MS) scenario and analog BF that does not suppress interference among MSs. In order to improve system performance in the mmW bands, fully digital BF that includes digital precoding should be employed to suppress the interference even when MSs travel in high mobility. This paper proposes two mmW BS cooperation technologies that are inter-baseband unit (inter-BBU) and intra-BBU cooperation for the fully digital BF. The inter-BBU cooperation exploits two M-MIMO antennas in two BBUs connected to one central unit by limited-bandwidth fronthaul, and the intra-BBU cooperates two M-MIMO antennas connected to one BBU with Doppler frequency shift compensation. This paper verifies effectiveness of the BS cooperation technologies by both computer simulations and outdoor experimental trials. First, it is shown that that the intra-BBU cooperation can achieve an excellent transmission performance in cases of two and four MSs moving at a velocity of 90km/h by computer simulations. Second, the outdoor experimental trials clarifies that the inter-BBU cooperation maintains the maximum throughput in a wider area than non-BS cooperation when only one MS moves at a maximum velocity of 120km/h.
ER -