| 講演抄録/キーワード |
| 講演名 |
2023-10-11 14:30
[ポスター講演]準狭帯域無線システムDR-IoT設計のためのVHF-High帯通信実験 ~ 地理的条件を考慮した伝搬特性推定手法の考察 ~ ○池亀旅人・池田直希・今井元就・井家上哲史(明大)・高井峰生(阪大)・石原 進(静岡大)・加藤新良太・梶田宗吾(スペースタイムエンジニアリング) |
| 抄録 |
(和) |
VHF-High帯(207.5 MHz~222 MHz)において, 十分な伝送速度を実現可能な災害対応の準狭帯域無線システムDR-IoT(Diversified-Range / Disaster-Response IoT)の検討が進められている.DR-IoTでは6.25 kHzから400 kHzの準狭帯域の複数の帯域幅をもつチャネルを多数用意し,これらを活用することで用途,通信範囲,収容端末数に応じて柔軟にネットワークを構築することを目指している.屋外伝搬特性測定結果より,山岳地形における伝搬特性の把握にITM(Longley-Rice)が有効であることはすでに報告した.また一方で,市街地の建物の多い見通し外環境などの周辺環境によるシャドウイングやフェージングの影響への考慮が必要であると報告されている.本検討では,屋外伝搬特性測定結果より,ITM(Longley-Rice),基盤地図情報(国土地理院)による建築物のデータベースを基とした,山岳地形や市街地の見通し外環境などの地理的条件を考慮した統計的な距離伝搬特性モデルの推定手法の考察を行う. |
| (英) |
In the VHF-High band (207.5 MHz to 222 MHz), research is being conducted on a disaster-response narrowband wireless system called DR-IoT (Diversified-Range / Disaster-Response IoT) capable of achieving sufficient transmission speed. In DR-IoT, multiple channel bandwidths ranging from 6.25 kHz to 400 kHz are provided, and the goal is to flexibly build a network based on the application, communication range, and the number of accommodated terminals by utilizing these bandwidths. It has been reported that ITM (Longley-Rice) is effective in understanding propagation characteristics in mountainous terrain, based on outdoor propagation measurement results. However, it has also been reported that consideration is needed for the impact of shadowing and fading caused by surrounding environments such as urban areas with many buildings and non-line-of-sight (NLOS) conditions. In this study, we will consider a statistical distance propagation model that considers geographical conditions such as mountainous terrain and non-line-of-sight (NLOS) urban environments, based on outdoor propagation measurement results and a database of building information from the basic map information (The Geospatial Information Authority of Japan) and discuss the estimation method for this model. |
| キーワード |
(和) |
DR-IoT / 伝搬モデル / ITM (Longley-Rice) / / / / / |
| (英) |
DR-IoT / Propagation model / ITM (Longley-Rice) / / / / / |
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信学技報 |
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