| Presentation | 2024-01-19 Parameter Reduction for Interference Coordination from HAPS to Terrestrial Systems Using Null Sweeping 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) | High-altitude platform stations (HAPSs) have attracted increasing attention for their potential to extend coverage in mobile networks and provide communication infrastructure during disasters. As a technology to realize spectrum sharing between HAPS and terrestrial systems, a method has been proposed to form a single null toward each terrestrial base station (BS) using an array antenna mounted on HAPS. Furthermore, an advanced technique referred to as a null-sweeping scheme is under consideration. This scheme dynamically changes the direction of the null on each time and frequency resource toward each terrestrial BS, thereby enhancing the interference reduction effect on terrestrial cells. However, in this scheme, user scheduling performed by the terrestrial BS requires an evaluation of interference from the HAPS for each wireless resource. Therefore, the scheme necessitates the communication of a substantial number of parameters, such as precoding weights, from HAPS to each terrestrial BS. This poses a significant load on the backhaul links, including the feeder link. This paper proposes a method of reducing the number of shared parameters by modeling the interference power from HAPS to each terrestrial cell. Simulation results demonstrate that the proposed method can significantly reduce the number of parameters without impacting the interference reduction on terrestrial cells. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | HAPS / spectrum sharing / MU-MIMO / nullforming / null sweeping |
| Paper # | IT2023-60,SIP2023-93,RCS2023-235 |
| Date of Issue | 2024-01-11 (IT, SIP, RCS) |
| Conference Information | |
| Committee | SIP / IT / RCS |
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| Conference Date | 2024/1/18(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Takayuki Nakachi(Ryukyu Univ.) / Tetsuya Kojima(Tokyo Kosen) / Kenichi Higuchi(Tokyo Univ. of Science) |
| Vice Chair | Koichi Ichige(Yokohama National Univ.) / Kiyoshi Nishikawa(okyo Metropolitan Univ.) / Yasuyuki Nogami(Okayama Univ.) / Fumihide Kojima(NICT) / Osamu Muta(Kyushu Univ.) / Naoto Ishii(NEC) |
| Secretary | Koichi Ichige(Chiba Univ.) / Kiyoshi Nishikawa(Kogakuin Univ.) / Yasuyuki Nogami(Waseda Univ.) / Fumihide Kojima(Nagaoka Univ. of Tech.) / Osamu Muta(Univ. of Electro-Comm) / Naoto Ishii(Sharp) |
| Assistant | Taichi Yoshida(UEC) / Sayaka Shiota(Tokyo Metropolitan Univ.) / Tetsunao Matsuta(Saitamai Univ.) / Masashi Iwabuchi(NTT) / Issei Kanno(KDDI Research) / Yuyuan Chang(Tokyo Inst. of Tech) / Kazuki Maruta(Tokyo Univ. of Science) / Kiichi Tateishi(NTT Docomo) |
| Paper Information | |
| Registration To | Technical Committee on Signal Processing / Technical Committee on Information Theory / 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) | Parameter Reduction for Interference Coordination from HAPS to Terrestrial Systems Using Null Sweeping |
| Sub Title (in English) | |
| Keyword(1) | HAPS |
| Keyword(2) | spectrum sharing |
| Keyword(3) | MU-MIMO |
| Keyword(4) | nullforming |
| Keyword(5) | null sweeping |
| 1st Author's Name | Tsutomu Ishikawa |
| 1st Author's Affiliation | SoftBank Corp.(SoftBank) |
| 2nd Author's Name | Koji Tashiro |
| 2nd Author's Affiliation | SoftBank Corp.(SoftBank) |
| 3rd Author's Name | Kenji Hoshino |
| 3rd Author's Affiliation | SoftBank Corp.(SoftBank) |
| 4th Author's Name | Atsushi Nagate |
| 4th Author's Affiliation | SoftBank Corp.(SoftBank) |
| Date | 2024-01-19 |
| Paper # | IT2023-60,SIP2023-93,RCS2023-235 |
| Volume (vol) | vol.123 |
| Number (no) | IT-338,SIP-339,RCS-340 |
| Page | pp.pp.163-168(IT), pp.163-168(SIP), pp.163-168(RCS), |
| #Pages | 6 |
| Date of Issue | 2024-01-11 (IT, SIP, RCS) |