| Presentation | 2023-08-31 [Invited Lecture] Nullforming and Coordination Techniques for Spectrum Sharing between High-Altitude Platforms and Terrestrial Networks Koji Tashiro, Kenji Hoshino, Atsushi Nagate, |
|---|---|
| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Non-terrestrial networks (NTNs) using high-altitude platform stations (HAPSs) have garnered significant attention as a leading technology for providing an extended coverage in mobile communications. For operating multiple HAPSs using the same frequency band as terrestrial networks, interference with terrestrial cells, which is produced by HAPSs, and interference between HAPSs should be properly managed. The authors have considered nullforming and coordination techniques for spectrum sharing between HAPSs and terrestrial networks. In this invited lecture, we introduce a nullforming technique combined with subarray grouping for reducing the interference with service areas of neighboring HAPSs, targeting massive MIMO systems with a cylindrical array antenna that achieves the service area with a radius of 100 km. In addition, nullforming schemes for mitigating the interference with terrestrial cells are also introduced. Furthermore, we give a presentation on a null-sweeping scheme where HAPSs switch the direction of nulls in time and/or frequency domain in coordination with terrestrial base stations, which can improve the interference reduction performance through multiple nulls with different directions. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | high-altitude platform station / spectrum sharing / nullforming / null-sweeping / interference reduction |
| Paper # | SAT2023-37,RCS2023-108 |
| Date of Issue | 2023-08-24 (SAT, RCS) |
| Conference Information | |
| Committee | RCS / SAT |
|---|---|
| Conference Date | 2023/8/31(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Naganoken Nokyo Building, and online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Satellite Communications, Broadcasting, Forward Error Correction, Wireless Communications, etc. |
| Chair | Kenichi Higuchi(Tokyo Univ. of Science) / Takana Kaho(Shonan Inst. of Tech.) |
| Vice Chair | Fumihide Kojima(NICT) / Osamu Muta(Kyushu Univ.) / Naoto Ishii(NEC) / Masashi Kamei(NHK) / Yoji Kishi(KDDI Research) |
| Secretary | Fumihide Kojima(Univ. of Electro-Comm) / Osamu Muta(Sharp) / Naoto Ishii(Mitsubishi Electric) / Masashi Kamei(NTT) / Yoji Kishi(NHK) |
| Assistant | Masashi Iwabuchi(NTT) / Issei Kanno(KDDI Research) / Yuyuan Chang(Tokyo Inst. of Tech) / Kazuki Maruta(Tokyo Univ. of Science) / Kiichi Tateishi(NTT Docomo) / Riichiro Nagareda(KDDI Research) / Hideaki Kotake(NICT) |
| Paper Information | |
| Registration To | Technical Committee on Radio Communication Systems / Technical Committee on Satellite Telecommunications |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | [Invited Lecture] Nullforming and Coordination Techniques for Spectrum Sharing between High-Altitude Platforms and Terrestrial Networks |
| Sub Title (in English) | |
| Keyword(1) | high-altitude platform station |
| Keyword(2) | spectrum sharing |
| Keyword(3) | nullforming |
| Keyword(4) | null-sweeping |
| Keyword(5) | interference reduction |
| 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 | 2023-08-31 |
| Paper # | SAT2023-37,RCS2023-108 |
| Volume (vol) | vol.123 |
| Number (no) | SAT-171,RCS-172 |
| Page | pp.pp.24-24(SAT), pp.36-36(RCS), |
| #Pages | 1 |
| Date of Issue | 2023-08-24 (SAT, RCS) |