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Paper Abstract and Keywords
Presentation 2020-11-27 16:05
Human Blockage Loss Characteristics of 5 GHz in A Crowded Stadium
Motoharu Sasaki, Toshiro Nakahira, Keisuke Wakao, Takatsune Moriyama (NTT) AP2020-94
Abstract (in Japanese) (See Japanese page) 
(in English) This paper reports on human body blockage loss characteristics based on measurement results under unoccupied and crowded conditions in a stadium environment. The measurements were taken at the Japan National Stadium, which will be used at the opening ceremonies of the Tokyo 2020 Olympics and Paralympics. We measured the received signal strength (RSSI) with smartphones (UEs) using the Wi-Fi signal from various access points (APs) laid inside the stadium for actual service. The measurement data were acquired at the opening event of the Japan National Stadium on December 21, 2019, and the measurements were performed both in the unoccupied environment before the event and in the crowded environment after the event started. We analyzed the human blockage loss characteristics by comparing the measurement data taken under the crowded and unoccupied conditions and clarified the location dependency and time variation characteristics of the human blockage loss in a crowded stadium. The results showed that while the location dependence of the human blockage loss does not depend on the distance between the APs and UEs, it does differ depending on the location, and follows a normal distribution with a median value of 7.2 dB and standard deviation of 5.5 dB. We also found that the time variation characteristics of human blockage loss follow a normal distribution with a standard deviation of 2.4 dB.
Keyword (in Japanese) (See Japanese page) 
(in English) Human blockage / Stadium / Crowded environment / Wi-Fi / 5 GHz / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 248, AP2020-94, pp. 112-117, Nov. 2020.
Paper # AP2020-94 
Date of Issue 2020-11-18 (AP) 
ISSN Online edition: ISSN 2432-6380
Copyright
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reproduction
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 AP UWT  
Conference Date 2020-11-25 - 2020-11-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Adaptive Antenna, Equalization, Interference Canceler, MIMO, Wireless Communications, etc. 
Paper Information
Registration To AP 
Conference Code 2020-11-RCS-AP-UWT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Human Blockage Loss Characteristics of 5 GHz in A Crowded Stadium 
Sub Title (in English)  
Keyword(1) Human blockage  
Keyword(2) Stadium  
Keyword(3) Crowded environment  
Keyword(4) Wi-Fi  
Keyword(5) 5 GHz  
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1st Author's Name Motoharu Sasaki  
1st Author's Affiliation NTT (NTT)
2nd Author's Name Toshiro Nakahira  
2nd Author's Affiliation NTT (NTT)
3rd Author's Name Keisuke Wakao  
3rd Author's Affiliation NTT (NTT)
4th Author's Name Takatsune Moriyama  
4th Author's Affiliation NTT (NTT)
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Speaker Author-1 
Date Time 2020-11-27 16:05:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2020-94 
Volume (vol) vol.120 
Number (no) no.248 
Page pp.112-117 
#Pages
Date of Issue 2020-11-18 (AP) 


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