NDLI: Imt‐2000サービス特集 (2) モバイル新世紀の先駆け「foma」誕生リンク系装置技術

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Imt‐2000サービス特集 (2) モバイル新世紀の先駆け「foma」誕生リンク系装置技術

Content Provider	Semantic Scholar
Author	上利継男新田正雄洞山哲也三井力向山徹黒沢貴之
Copyright Year	2001
Abstract	次世代移動通信(IMT-2000:International Mobile Telecommunications-2000)では,音声からデータ,画像までの多種多様なサービスを効率的に伝送するため,非同期転送モード(ATM:Asynchronous Transfer Mode)技術を採用している.そのため,ATM対応の多重化装置やエントランス伝送路においてはさらなる伝送容量の増大が必要であり, その要求に応える新たなリンク系装置として,ATM形クロスコネクト装置(ATM-XC:ATM-Cross Connect equipment),ATM形多重化装置,11/15G-26MD無線方式を開発した.また,ATM形多重化装置の開発においては,ディジタル自動車電話方式(PDC:Personal Digital Cellular)の基地局にIMT-2000方式の基地局が併設される場合,従来の PDCサービスをATM化し,IMT-2000用専用回線に重畳する機能を実現することにより経済化も図った. 開発した各装置は,ATM-XCが中継伝送路,ノード局用 ATM形多重化装置(ATM-MUX:ATM MUltipleXer for node station)が基地局伝送路にそれぞれ導入され, 11/15G-26MD無線方式はエントランス伝送路に用いられる(図1). 本稿では,これらのIMT-2000構築に関るリンク系装置類の機能概要および特徴について解説する.
Starting Page	32
Ending Page	40
Page Count	9
File Format	PDF HTM / HTML
Volume Number	9
Alternate Webpage(s)	https://www.nttdocomo.co.jp/binary/pdf/corporate/technology/rd/technical_journal/bn/vol9_3/vol9_3_032jp.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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