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Paper Abstract and Keywords
Presentation 2026-03-06 10:45
5G Control Plane Congestion Mitigation by Pre-slice Priority Control and AMF Delay Analysis
Izzy Nha, Akihiro Nakao (UTokyo) NS2025-315
Abstract (in Japanese) (See Japanese page) 
(in English) With the rapid growth of Internet of Things (IoT) devices, control plane congestion caused by massive simultaneous connections has emerged as a critical challenge that degrades the availability and robustness of 5G core networks.
This study proposes a selective connection control mechanism that prevents control plane collapse and maintains connectivity for high-priority User Equipment (UE) during the initial registration phase, referred to as the pre-slice stage, where slice information is not yet available. Specifically, we introduce a method that combines early priority control with multi-threaded processing within the Access and Mobility Management Function (AMF).
The novelty of this work lies in mitigating congestion through early priority assignment at the Pre-slice stage, while decomposing and visualizing the total connection time, which is defined as the duration from the initiation of a UE connection request to the completion of Packet Data Unit (PDU) session establishment, using telemetry analysis.
The analysis reveals that the primary cause of control plane latency is not the internal computational processing of the AMF, but the waiting time associated with inter-Network Function (NF) communication. Experimental results demonstrate that the proposed method significantly reduces these communication stalls, achieving a maximum reduction of 90.16% in the average total connection time for high-priority UEs, while improving CPU utilization by approximately 22% through more efficient use of computational resources. These results indicate that the proposed approach effectively enhances the robustness of 5G core networks by optimizing communication latency and resource utilization.
Keyword (in Japanese) (See Japanese page) 
(in English) 5G / control plane congestion / AMF optimization / multithreaded processing / priority-based scheduling / telemetry-based analysis / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 385, NS2025-315, pp. 551-556, March 2026.
Paper # NS2025-315 
Date of Issue 2026-02-25 (NS) 
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 NS2025-315

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 NS 
Conference Code 2026-03-IN-NS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) 5G Control Plane Congestion Mitigation by Pre-slice Priority Control and AMF Delay Analysis 
Sub Title (in English)  
Keyword(1) 5G  
Keyword(2) control plane congestion  
Keyword(3) AMF optimization  
Keyword(4) multithreaded processing  
Keyword(5) priority-based scheduling  
Keyword(6) telemetry-based analysis  
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Keyword(8)  
1st Author's Name Izzy Nha  
1st Author's Affiliation University of Tokyo (UTokyo)
2nd Author's Name Akihiro Nakao  
2nd Author's Affiliation University of Tokyo (UTokyo)
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Speaker Author-1 
Date Time 2026-03-06 10:45:00 
Presentation Time 25 minutes 
Registration for NS 
Paper # NS2025-315 
Volume (vol) vol.125 
Number (no) no.385 
Page pp.551-556 
#Pages 6 
Date of Issue 2026-02-25 (NS) 

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