| Presentation | 2023-04-13 Null Sweeping for Reduction of Residual Interference between HAPS and Terrestrial Systems Tsutomu Ishikawa, Koji Tashiro, Kenji Hoshino, Atsushi Nagate, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A high-altitude platform station (HAPS) is a promising technology which realizes the coverage extension in the 6G wireless systems. From the aspects of spectral efficiency, it is desirable that HAPS uses the same frequencies that terrestrial systems use. Assuming this spectrum sharing, interference reduction between HAPS and the terrestrial systems is essential; therefore, the scheme where HAPS forms a single null towards each ground base station (BS) has been considered. However, we cannot necessarily protect the whole area of the ground cell by the single null. The communication quality around the cell edge becomes low. In particular, this quality deterioration of the ground cells near HAPS would be significant. In this paper, we propose a scheme where HAPS changes the direction of the single null over the time or frequency domain, which we call null sweeping. In this scheme, HAPS cooperates with the terrestrial systems, and reduces the residual interference with numerous ground cell users. Simulation results show that the proposed scheme improves the received signal-to-interference-plus-noise ratio and the sum capacity of the terrestrial systems even in the case that the ground BSs are located relatively close to HAPS. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | HAPS / spectrum sharing / MU-MIMO / nullforming |
| Paper # | RCS2023-2 |
| Date of Issue | 2023-04-06 (RCS) |
| Conference Information | |
| Committee | RCS |
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| Conference Date | 2023/4/13(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Matsue New Urban Hotel, and online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Railroad Communications, Inter-Vehicle Communications, Road to Vehicle Communications, Radio Access Technologies, Wireless Communications, etc. |
| Chair | Kenichi Higuchi(Tokyo Univ. of Science) |
| Vice Chair | Tomoya Tandai(Toshiba) / Fumihide Kojima(NICT) / Osamu Muta(Kyushu Univ.) |
| Secretary | Tomoya Tandai(Panasonic) / Fumihide Kojima(Univ. of Electro-Comm) / Osamu Muta(Sharp) |
| Assistant | Manabu Sakai(Mitsubishi Electric) / Masashi Iwabuchi(NTT) / Issei Kanno(KDDI Research) / Yuyuan Chang(Tokyo Inst. of Tech) / Kazuki Maruta(Tokyo Univ. of Science) |
| Paper Information | |
| Registration To | Technical Committee on Radio Communication Systems |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Null Sweeping for Reduction of Residual Interference between HAPS and Terrestrial Systems |
| Sub Title (in English) | |
| Keyword(1) | HAPS |
| Keyword(2) | spectrum sharing |
| Keyword(3) | MU-MIMO |
| Keyword(4) | nullforming |
| 1st Author's Name | Tsutomu Ishikawa |
| 1st Author's Affiliation | SoftBank Corporation(SoftBank Corp.) |
| 2nd Author's Name | Koji Tashiro |
| 2nd Author's Affiliation | SoftBank Corporation(SoftBank Corp.) |
| 3rd Author's Name | Kenji Hoshino |
| 3rd Author's Affiliation | SoftBank Corporation(SoftBank Corp.) |
| 4th Author's Name | Atsushi Nagate |
| 4th Author's Affiliation | SoftBank Corporation(SoftBank Corp.) |
| Date | 2023-04-13 |
| Paper # | RCS2023-2 |
| Volume (vol) | vol.123 |
| Number (no) | RCS-3 |
| Page | pp.pp.7-12(RCS), |
| #Pages | 6 |
| Date of Issue | 2023-04-06 (RCS) |