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Paper Abstract and Keywords
Presentation 2026-04-10 10:50
A Study on Redundancy for Fixed IP Address Allocation in Mobile Core Networks
Kenzo Okuda (NTT), Koichiro Kunitomo, Katsuma Miyamoto, Takashi Shiramizu (NTT DOCOMO) NS2026-13
Abstract (in Japanese) (See Japanese page) 
(in English) In mobile core networks, assigning fixed IP addresses to user equipment (UE) is an important capability for applications such as IoT devices and VPN connectivity. However, when User Plane Functions (UPFs) are deployed in a geographically redundant configuration, it becomes difficult to forward downlink packets from the data network to the appropriate UPF. A conventional approach is to advertise per-UE routing information using dynamic routing protocols such as BGP. However, this requires advertising host routes for each UE session, leading to scalability issues in large-scale networks. This paper investigates a method to realize geographically redundant UPF deployment while maintaining fixed IP addresses for user equipment. We propose an architecture in which the UPF is separated into control and user plane components, and identical session information and packet processing rules are distributed across multiple user plane instances. This enables geographically redundant operation without relying on per-UE routing. Furthermore, we evaluate the proposed approach in comparison with conventional methods and discuss its effectiveness and applicable scenarios.
Keyword (in Japanese) (See Japanese page) 
(in English) 5GC / UPF / Fixed IP address / Redundancy / Anycast / Mobile core network / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 2, NS2026-13, pp. 70-74, April 2026.
Paper # NS2026-13 
Date of Issue 2026-04-02 (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 NS2026-13

Conference Information
Committee NS  
Conference Date 2026-04-09 - 2026-04-10 
Place (in Japanese) (See Japanese page) 
Place (in English) Yakushima Island Environmental and Cultural Village Center + Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Communication traffic theory, Traffic and quality evaluation, Network performance evaluation, QoS/QoE, Reliability and robustness, Traffic and quality management, AI and machine learning, Network and system operation management, High capacity, low latency, many connections, General 
Paper Information
Registration To NS 
Conference Code 2026-04-NS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Redundancy for Fixed IP Address Allocation in Mobile Core Networks 
Sub Title (in English)  
Keyword(1) 5GC  
Keyword(2) UPF  
Keyword(3) Fixed IP address  
Keyword(4) Redundancy  
Keyword(5) Anycast  
Keyword(6) Mobile core network  
Keyword(7)  
Keyword(8)  
1st Author's Name Kenzo Okuda  
1st Author's Affiliation NTT, Inc. (NTT)
2nd Author's Name Koichiro Kunitomo  
2nd Author's Affiliation NTT DOCOMO, INC (NTT DOCOMO)
3rd Author's Name Katsuma Miyamoto  
3rd Author's Affiliation NTT DOCOMO, INC (NTT DOCOMO)
4th Author's Name Takashi Shiramizu  
4th Author's Affiliation NTT DOCOMO, INC (NTT DOCOMO)
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Speaker Author-1 
Date Time 2026-04-10 10:50:00 
Presentation Time 25 minutes 
Registration for NS 
Paper # NS2026-13 
Volume (vol) vol.126 
Number (no) no.2 
Page pp.70-74 
#Pages 5 
Date of Issue 2026-04-02 (NS) 

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