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Paper Abstract and Keywords
Presentation 2026-07-23 14:00
One-year Differential Evaluation of Sub-6 band 5G Mobile Communications System Base Station Signal Characteristics Around and Above Sendai International Airport
Shunichi Futatsumori, Kazuyuki Morioka, Noriaki Hiraga (ENRI) AP2026-61 SANE2026-49 SAT2026-28
Abstract (in Japanese) (See Japanese page) 
(in English) This report discusses electromagnetic interference (EMI) issues of aircraft radio altimeter (RA) due to Sub-6 band 5G mobile communications systems in Japan. The aircraft RAs are operated between 4.2−4.4 GHz. However, Sub-6 5G mobiles systems are introduced for the adjacent band those of the RA band. In Japan, the RA frequency band and the guard band for 5G mobile systems are 100 MHz, which is narrower than in other countries. We confirmed that the risk of interference is higher than other countries, under the narrow guard band conditions in Japan. In this paper, differences in base-station signal characteristics of sub-6 GHz band 5G mobile communication systems around and above Sendai International Airport and Sendai City between December 2024 and January 2026 are examined. The results confirm that airborne signal strength, including during approach and takeoff phases, increased by approximately 10 dB compared with measurements conducted one year earlier. In addition, the aerial coverage area expanded, including over the ocean. Consequently, the magnitude by which base-station signal strength exceeds the interference tolerance mask values increased. Furthermore, the number of observation points with detectable base-station signals in the 100-MHz guard band—where interference conditions are more critical—also increased.
Keyword (in Japanese) (See Japanese page) 
(in English) 5G mobile commutation system / Electromagnetic interference / Guard band / Radio altimeter / Spectrum sharing / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 123, SANE2026-49, pp. 96-101, July 2026.
Paper # SANE2026-49 
Date of Issue 2026-07-15 (AP, SANE, SAT) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
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)
Download PDF AP2026-61 SANE2026-49 SAT2026-28

Conference Information
Committee SAT AP SANE  
Conference Date 2026-07-22 - 2026-07-24 
Place (in Japanese) (See Japanese page) 
Place (in English) Kobe Port Oasis 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Remote sensing, Sattelite Communication, Radio propagation, Antennas and Propagation 
Paper Information
Registration To SANE 
Conference Code 2026-07-SAT-AP-SANE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) One-year Differential Evaluation of Sub-6 band 5G Mobile Communications System Base Station Signal Characteristics Around and Above Sendai International Airport 
Sub Title (in English)  
Keyword(1) 5G mobile commutation system  
Keyword(2) Electromagnetic interference  
Keyword(3) Guard band  
Keyword(4) Radio altimeter  
Keyword(5) Spectrum sharing  
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Keyword(7)  
Keyword(8)  
1st Author's Name Shunichi Futatsumori  
1st Author's Affiliation Electronic Navigation Research Institute (ENRI)
2nd Author's Name Kazuyuki Morioka  
2nd Author's Affiliation Electronic Navigation Research Institute (ENRI)
3rd Author's Name Noriaki Hiraga  
3rd Author's Affiliation Electronic Navigation Research Institute (ENRI)
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Speaker Author-1 
Date Time 2026-07-23 14:00:00 
Presentation Time 20 minutes 
Registration for SANE 
Paper # AP2026-61, SANE2026-49, SAT2026-28 
Volume (vol) vol.126 
Number (no) no.122(AP), no.123(SANE), no.124(SAT) 
Page pp.106-111(AP), pp.96-101(SANE), pp.78-83(SAT) 
#Pages 6 
Date of Issue 2026-07-15 (AP, SANE, SAT) 

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