| Presentation | 2021-06-25 Null-Steering Technique in HAPS Systems for Spectrum Sharing with Terrestrial Mobile Networks 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) | Coverage extension to the sky, seas, and mountains is one of the important concepts of the sixth generation (6G) mobile communications. High-altitude platform stations (HAPS) have attracted much attention as a leading candidate for the coverage extension. In terms of spectrum sharing, it is preferable for HAPS systems to utilize the same frequency band as that used in terrestrial mobile networks. However, the signals from HAPS strongly interfere with the communications between a terrestrial base station (BS) and the users connected to the BS, which leads to serious deterioration in the system capacity of terrestrial networks. This paper proposes a null-steering technique for achieving the spectrum sharing between HAPS and terrestrial systems. Simulation results show that the proposed scheme is able to suppress the capacity degradation of terrestrial systems within 10% compared with the case where HAPS is out of service. Moreover, the proposed scheme achieves about 1.5 as high performance as a conventional beamforming method without null-steering, in terms of the sum capacity of HAPS and terrestrial systems. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | high-altitude platform station (HAPS) / null-steering / spectrum sharing / service link / 6G |
| Paper # | RCS2021-75 |
| Date of Issue | 2021-06-16 (RCS) |
| Conference Information | |
| Committee | RCS |
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| Conference Date | 2021/6/23(3days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | First Presentation in IEICE Technical Committee, Resource Control, Scheduling, Wireless Communications, etc. |
| Chair | Eiji Okamoto(Nagoya Inst. of Tech.) |
| Vice Chair | Fumihide Kojima(NICT) / Toshihiko Nishimura(Hokkaido Univ.) / Tomoya Tandai(Toshiba) |
| Secretary | Fumihide Kojima(Panasonic) / Toshihiko Nishimura(NEC) / Tomoya Tandai |
| Assistant | Koichi Adachi(Univ. of Electro-Comm.) / Osamu Nakamura(Sharp) / Manabu Sakai(Mitsubishi Electric) / Masashi Iwabuchi(NTT) / Tatsuki Okuyama(NTT DOCOMO) |
| 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-Steering Technique in HAPS Systems for Spectrum Sharing with Terrestrial Mobile Networks |
| Sub Title (in English) | |
| Keyword(1) | high-altitude platform station (HAPS) |
| Keyword(2) | null-steering |
| Keyword(3) | spectrum sharing |
| Keyword(4) | service link |
| Keyword(5) | 6G |
| 1st Author's Name | Koji Tashiro |
| 1st Author's Affiliation | SoftBank Corp.(SoftBank) |
| 2nd Author's Name | Kenji Hoshino |
| 2nd Author's Affiliation | SoftBank Corp.(SoftBank) |
| 3rd Author's Name | Atsushi Nagate |
| 3rd Author's Affiliation | SoftBank Corp.(SoftBank) |
| Date | 2021-06-25 |
| Paper # | RCS2021-75 |
| Volume (vol) | vol.121 |
| Number (no) | RCS-72 |
| Page | pp.pp.267-272(RCS), |
| #Pages | 6 |
| Date of Issue | 2021-06-16 (RCS) |