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| 講演名 | 2026-03-06 16:30 Precoding Optimization for FR3 Downlink Transmission Considering RF-EMF Exposure Based on Sionna Ray-Tracing ○Hongda Xu・Kun Li（UEC）  RCS2025-299 |
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| 抄録 | （和） | The FR3 band (7-24 GHz) has broad application prospects in future 6G mobile communication systems owing to its favorable balance between coverage and capacity. In beamformed downlink (DL) transmission using FR3 bands, base stations (BS) actively track user equipment (UE) to enhance link performance. However, such beamforming operations may unintentionally generate high radio frequency electromagnetic field (RF-EMF) levels in areas outside the target UE. To reduce RF-EMF exposure, simply reducing the transmitting power of BS may degrade overall system performance simultaneously. In this study, we propose a precoding optimization framework for FR3 DL transmission that balances both communication performance and RF-EMF exposure. Using the open-source Sionna ray-tracing library, a typical urban street scenario is modeled, and a co-simulation method is developed to jointly evaluate DL multiple-input single-output (MISO) channel and spatial distribution of incident power density (IPD). Based on these metrics, DL precoding is optimized to suppress unintended high-EMF regions while maintaining reliable link performance for the target UE. The results indicate that proposed precoding optimization method provides an effective solution of balancing wireless communication performance and RF-EMF exposure control, which is potentially to be used for practical 6G system design. |
| （英） | The FR3 band (7-24 GHz) has broad application prospects in future 6G mobile communication systems owing to its favorable balance between coverage and capacity. In beamformed downlink (DL) transmission using FR3 bands, base stations (BS) actively track user equipment (UE) to enhance link performance. However, such beamforming operations may unintentionally generate high radio frequency electromagnetic field (RF-EMF) levels in areas outside the target UE. To reduce RF-EMF exposure, simply reducing the transmitting power of BS may degrade overall system performance simultaneously. In this study, we propose a precoding optimization framework for FR3 DL transmission that balances both communication performance and RF-EMF exposure. Using the open-source Sionna ray-tracing library, a typical urban street scenario is modeled, and a co-simulation method is developed to jointly evaluate DL multiple-input single-output (MISO) channel and spatial distribution of incident power density (IPD). Based on these metrics, DL precoding is optimized to suppress unintended high-EMF regions while maintaining reliable link performance for the target UE. The results indicate that proposed precoding optimization method provides an effective solution of balancing wireless communication performance and RF-EMF exposure control, which is potentially to be used for practical 6G system design. | |
| キーワード | （和） | / / / / / / / |
| （英） | Downlink / FR3 / Radio Frequency Electromagnetic / Precoding Optimization / Sionna Ray-Tracing / / / | |
| 文献情報 | 信学技報, vol. 125, no. 387, RCS2025-299, pp. 233-237, 2026年3月. | |
| 資料番号 | RCS2025-299 | |
| 発行日 | 2026-02-25 (RCS) | |
| ISSN | Online edition: ISSN 2432-6380 | |
| 著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します．(許諾番号：10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| PDFダウンロード | RCS2025-299 |
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| 研究会情報 | |
| 研究会 | RCS SR SRW |
| 開催期間 | 2026-03-04 - 2026-03-06 |
| 開催地（和） | 東京理科大学 葛飾キャンパス |
| 開催地（英） | Tokyo University of Science |
| テーマ（和） | 移動通信ワークショップ |
| テーマ（英） | Mobile Communication Workshop |
| 講演論文情報の詳細 | |
| 申込み研究会 | RCS |
| 会議コード | 2026-03-RCS-SR-SRW |
| 本文の言語 | 英語 |
| タイトル（和） | |
| サブタイトル（和） | |
| タイトル（英） | Precoding Optimization for FR3 Downlink Transmission Considering RF-EMF Exposure Based on Sionna Ray-Tracing |
| サブタイトル（英） | |
| キーワード(1)（和/英） | / Downlink |
| キーワード(2)（和/英） | / FR3 |
| キーワード(3)（和/英） | / Radio Frequency Electromagnetic |
| キーワード(4)（和/英） | / Precoding Optimization |
| キーワード(5)（和/英） | / Sionna Ray-Tracing |
| キーワード(6)（和/英） | / |
| キーワード(7)（和/英） | / |
| キーワード(8)（和/英） | / |
| 第1著者 氏名（和/英/ヨミ） | 徐 宏達 / Hongda Xu / |
| 第1著者 所属（和/英） | 電気通信大学 (略称： 電通大) The University of Electro-Communications (略称： UEC) |
| 第2著者 氏名（和/英/ヨミ） | 李 鯤 / Kun Li / |
| 第2著者 所属（和/英） | 電気通信大学 (略称： 電通大) The University of Electro-Communications (略称： UEC) |
| 講演者 | 第1著者 |
| 発表日時 | 2026-03-06 16:30:00 |
| 発表時間 | 15分 |
| 申込先研究会 | RCS |
| 資料番号 | RCS2025-299 |
| 巻番号（vol） | vol.125 |
| 号番号（no） | no.387 |
| ページ範囲 | pp.233-237 |
| ページ数 | 5 |
| 発行日 | 2026-02-25 (RCS) |
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