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Paper Abstract and Keywords
Presentation 2026-03-06 13:00
Emergency CAC based on High-Precision Mathematical Model considering Class-Specific Packetization Interval Adjustment
Sota Narikiyo, Sumiko Miyata (Science Tokyo), Ken-ichi Baba (KUTE-TOKYO), Katsunori Yamaoka (Science Tokyo) IN2025-100
Abstract (in Japanese) (See Japanese page) 
(in English) During large-scale disasters, a surge in voice call requests causes severe congestion in the communication infrastructure. Under such conditions, increasing connected low-priority calls, such as safety confirmations, is a critical issue. We propose an call admission control method that adjusts the packetization interval of the voice packet. This increases low-priority connections while protecting high-priority calls. Verifying this requires a mathematical model, but balancing complexity and accuracy is hard. a conventional mathematical model was designed to reduce the number of states, but this model lacked the accuracy needed to find the optimal threshold. In this study, we improved the mathematical model to be accurate without increasing the number of states. This allows us to find the optimal threshold that maximizes the number of low-priority connections.
Keyword (in Japanese) (See Japanese page) 
(in English) Call admission control / Packetization Interval / Call blocking probability / Queueing theory / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 386, IN2025-100, pp. 230-235, March 2026.
Paper # IN2025-100 
Date of Issue 2026-02-25 (IN) 
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 IN2025-100

Conference Information
Committee IN NS  
Conference Date 2026-03-04 - 2026-03-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa-Ken Shichoson Jichi Kaikan 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General 
Paper Information
Registration To IN 
Conference Code 2026-03-IN-NS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Emergency CAC based on High-Precision Mathematical Model considering Class-Specific Packetization Interval Adjustment 
Sub Title (in English)  
Keyword(1) Call admission control  
Keyword(2) Packetization Interval  
Keyword(3) Call blocking probability  
Keyword(4) Queueing theory  
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1st Author's Name Sota Narikiyo  
1st Author's Affiliation Institute of Science Tokyo (Science Tokyo)
2nd Author's Name Sumiko Miyata  
2nd Author's Affiliation Institute of Science Tokyo (Science Tokyo)
3rd Author's Name Ken-ichi Baba  
3rd Author's Affiliation Kogakuin University (KUTE-TOKYO)
4th Author's Name Katsunori Yamaoka  
4th Author's Affiliation Institute of Science Tokyo (Science Tokyo)
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Speaker Author-1 
Date Time 2026-03-06 13:00:00 
Presentation Time 25 minutes 
Registration for IN 
Paper # IN2025-100 
Volume (vol) vol.125 
Number (no) no.386 
Page pp.230-235 
#Pages 6 
Date of Issue 2026-02-25 (IN) 

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