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| Presentation | 2025-09-17 14:30 Handover Control Method for Multiple Base Stations in Millimeter-Wave V2X Communication Ryoichi Nori, Jin Nakazato, Yuki Sasaki, Sojin Ozawa (TUS), Haruki Osaki, Tetsuya Iye (KKE), Kazuki Maruta, Mikio Hasegawa (TUS)  CQ2025-46 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | In V2X (Vehicle-to-Everything) communication environments using the 28GHz millimeter-wave band, there is the issue that communication quality deteriorates when dynamic movement leads from a line-of-sight (LoS) environment to a non-line-of-sight (NLoS) environment due to other vehicles, or when interference from other vehicles occurs. Therefore, in this study, we propose a handover (HO) control method between multiple base stations in scenarios where interference or blockage (LoS/NLoS transitions) occurs. Additionally, focusing on multi-base-station handovers, we compare and evaluate two methods with different design philosophies—coordinated transmission and null steering—under identical conditions to verify the superiority of each method. Coordinated transmission aims to improve reception quality during handover by having multiple base stations synchronously transmit the same data, thereby combining interference components as the desired signals. On the other hand, null steering suppresses interference by projecting onto orthogonal supplementary spaces in the direction of interference. In our evaluations, using a straight-line scenario with three base stations and two terminals plus two blocking vehicles, we utilized three conditions—interference only, blockage only, and interference plus blockage—and compared both methods under SINR-based connected-BS selection using A3 trigger plus Time-To-Trigger (TTT). As a result, we confirmed that there are situations in which the synthetic gain from coordinated transmission and the interference reduction from null steering each function effectively, even at beam intersections at cell boundaries or during blockage transitions. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | millimeter wave / V2X / handover / beamforming / null space expansion / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 125, no. 182, CQ2025-46, pp. 19-24, Sept. 2025. | |
| Paper # | CQ2025-46 | |
| Date of Issue | 2025-09-10 (CQ) | |
| 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 | CQ2025-46 |
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| Conference Information | |
| Committee | CQ MIKA |
| Conference Date | 2025-09-17 - 2025-09-19 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | TBDWireless Communication Quality, 6G, IoT, CPS, Wireless Resource Optimization, etc. |
| Paper Information | |
| Registration To | CQ |
| Conference Code | 2025-09-CQ-MIKA |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Handover Control Method for Multiple Base Stations in Millimeter-Wave V2X Communication |
| Sub Title (in English) | |
| Keyword(1) | millimeter wave |
| Keyword(2) | V2X |
| Keyword(3) | handover |
| Keyword(4) | beamforming |
| Keyword(5) | null space expansion |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Ryoichi Nori |
| 1st Author's Affiliation | Tokyo University of Science (TUS) |
| 2nd Author's Name | Jin Nakazato |
| 2nd Author's Affiliation | Tokyo University of Science (TUS) |
| 3rd Author's Name | Yuki Sasaki |
| 3rd Author's Affiliation | Tokyo University of Science (TUS) |
| 4th Author's Name | Sojin Ozawa |
| 4th Author's Affiliation | Tokyo University of Science (TUS) |
| 5th Author's Name | Haruki Osaki |
| 5th Author's Affiliation | KOZO KEIKAKU ENGINEERING Inc. (KKE) |
| 6th Author's Name | Tetsuya Iye |
| 6th Author's Affiliation | KOZO KEIKAKU ENGINEERING Inc. (KKE) |
| 7th Author's Name | Kazuki Maruta |
| 7th Author's Affiliation | Tokyo University of Science (TUS) |
| 8th Author's Name | Mikio Hasegawa |
| 8th Author's Affiliation | Tokyo University of Science (TUS) |
| Speaker | Author-1 |
| Date Time | 2025-09-17 14:30:00 |
| Presentation Time | 25 minutes |
| Registration for | CQ |
| Paper # | CQ2025-46 |
| Volume (vol) | vol.125 |
| Number (no) | no.182 |
| Page | pp.19-24 |
| #Pages | 6 |
| Date of Issue | 2025-09-10 (CQ) |
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