{"created":"2025-01-19T01:29:57.851662+00:00","updated":"2025-01-19T11:12:36.177791+00:00","metadata":{"_oai":{"id":"oai:ipsj.ixsq.nii.ac.jp:00230293","sets":["6504:11436:11441"]},"path":["11441"],"owner":"44499","recid":"230293","title":["LoRaWAN????クラスB通信におけるNTPサーバを用いた時刻同期方式"],"pubdate":{"attribute_name":"公開日","attribute_value":"2023-02-16"},"_buckets":{"deposit":"a7a9238e-5e52-4495-993e-2fd23fc3c1f4"},"_deposit":{"id":"230293","pid":{"type":"depid","value":"230293","revision_id":0},"owners":[44499],"status":"published","created_by":44499},"item_title":"LoRaWAN????クラスB通信におけるNTPサーバを用いた時刻同期方式","author_link":["620308","620309","620307","620310"],"item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"LoRaWAN????クラスB通信におけるNTPサーバを用いた時刻同期方式"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"ネットワーク","subitem_subject_scheme":"Other"}]},"item_type_id":"22","publish_date":"2023-02-16","item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_22_text_3":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"NTT西日本"},{"subitem_text_value":"NTT西日本"},{"subitem_text_value":"NTT西日本"},{"subitem_text_value":"NTT西日本"}]},"item_publisher":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"情報処理学会","subitem_publisher_language":"ja"}]},"publish_status":"0","weko_shared_id":-1,"item_file_price":{"attribute_name":"Billing file","attribute_type":"file","attribute_value_mlt":[{"url":{"url":"https://ipsj.ixsq.nii.ac.jp/record/230293/files/IPSJ-Z85-2E-04.pdf","label":"IPSJ-Z85-2E-04.pdf"},"date":[{"dateType":"Available","dateValue":"2023-11-17"}],"format":"application/pdf","filename":"IPSJ-Z85-2E-04.pdf","filesize":[{"value":"496.5 kB"}],"mimetype":"application/pdf","accessrole":"open_date","version_id":"888e9c08-58da-4ec0-8cc7-c68c3787c824","displaytype":"detail","licensetype":"license_note","license_note":"Copyright (c) 2023 by the Information Processing Society of Japan"}]},"item_22_creator_5":{"attribute_name":"著者名","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"髙田, 祥平"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"金城, 皓羽"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"森田, 智子"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"石原, 達也"}],"nameIdentifiers":[{}]}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourceuri":"http://purl.org/coar/resource_type/c_5794","resourcetype":"conference paper"}]},"item_22_source_id_9":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00349328","subitem_source_identifier_type":"NCID"}]},"item_22_description_7":{"attribute_name":"論文抄録","attribute_value_mlt":[{"subitem_description":"LoRaWAN????においてエンドデバイス(ED)の消費電力を抑えながら下り通信を行うクラスB通信では、EDはGPS信号により時刻同期されたゲートウェイ(GW)から発出されるビーコン情報を用いて下り通信の受信タイミング設定を行う。しかし、屋内などのGPS電波が届かない環境では、各GWからのビーコン送信タイミングがずれることでEDはビーコン情報を正しく復号できず、結果として下り通信が失敗する可能性がある。そこで本稿では、GW間の時刻ずれを考慮し、定期的にビーコンを発出させないビーコン間引き機能とNTPサーバによる時刻同期を組み合わせた方式について提案し、評価結果について併せて報告する。","subitem_description_type":"Other"}]},"item_22_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicPageEnd":"48","bibliographic_titles":[{"bibliographic_title":"第85回全国大会講演論文集"}],"bibliographicPageStart":"47","bibliographicIssueDates":{"bibliographicIssueDate":"2023-02-16","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicVolumeNumber":"2023"}]},"relation_version_is_last":true,"weko_creator_id":"44499"},"id":230293,"links":{}}