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Paper Abstract and Keywords
Presentation 2019-04-18 11:20
28 GHz-Band Experimental Trial of Downlink Massive MIMO in Urban Railway Environment
Kazushi Muraoka, Nobuhide Nonaka, Yuta Takahashi, Tatsuki Okuyama, Jun Mashino, Satoshi Suyama, Yukihiko Okumura (NTT DOCOMO) RCS2019-5
Abstract (in Japanese) (See Japanese page) 
(in English) Field trials of the fifth-generation (5G) mobile communication system using 28 GHz band at which 400 MHz band will be available have been performed all over the world. To realize large coverage at such a high frequency band, beamforming by Massive MIMO (Multiple Input Multiple Output) is necessary to compensate large path loss. Furthermore, beam tracking which adaptively changes beam direction according to user location is an important function to support user mobility. Authors already conducted experimental trials using 28 GHz-band 5G prototypes implementing beam tracking in rural railroad environments. The experiment was performed with a train running over a straight track. We conducted another experimental trial deploying two 28 GHz-band base stations along with a curved track in urban railroad environment. This report reveals downlink performance results of the experimental trials.
Keyword (in Japanese) (See Japanese page) 
(in English) 5G / Railroad / High Mobility / Massive MIMO / Beamforming / / /  
Reference Info. IEICE Tech. Rep., vol. 119, no. 8, RCS2019-5, pp. 23-28, April 2019.
Paper # RCS2019-5 
Date of Issue 2019-04-11 (RCS) 
ISSN Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee RCS  
Conference Date 2019-04-18 - 2019-04-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Noboribetsu Grand Hotel 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Railroad Communications, Inter-Vehicle Communications, Road to Vehicle Communications, Radio Access Technologies, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2019-04-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) 28 GHz-Band Experimental Trial of Downlink Massive MIMO in Urban Railway Environment 
Sub Title (in English)  
Keyword(1) 5G  
Keyword(2) Railroad  
Keyword(3) High Mobility  
Keyword(4) Massive MIMO  
Keyword(5) Beamforming  
1st Author's Name Kazushi Muraoka  
1st Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
2nd Author's Name Nobuhide Nonaka  
2nd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
3rd Author's Name Yuta Takahashi  
3rd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
4th Author's Name Tatsuki Okuyama  
4th Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
5th Author's Name Jun Mashino  
5th Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
6th Author's Name Satoshi Suyama  
6th Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
7th Author's Name Yukihiko Okumura  
7th Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
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Speaker Author-1 
Date Time 2019-04-18 11:20:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2019-5 
Volume (vol) vol.119 
Number (no) no.8 
Page pp.23-28 
Date of Issue 2019-04-11 (RCS) 

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