多様なサービスを実現するスモールセルソリューション
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- きょういち あいしま
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1 Small-Cell Solution to Make Diverse Services Possible 橋本正則 岩本秀男 あらまし IoT Internet of Things Abstract The Internet of Things (IoT) has brought the age of connection where everything is linked to a network, but it is also causing an eruption of mobile network traffic and non-uniform traffic concentration in certain areas. While a mobile telecommunication network will become more important than ever, the current networking configuration is not capable of handling the increasing demand. To address this situation, and having the future mobile network in mind, it is important to consider reinforcing the existing macro cells with small cells to counter data traffic concentrations in certain small areas called hot spots. This paper introduces the small-cell solution that has been developed to address this challenge by bolstering the data traffic capacity in specific areas. It explains the solution in terms of its structure as well as the functions and technologies that it deploys. The paper also describes the services this solution offers, touching on the diversity of the applicable fields as well as the solution s scalability and adaptability to future technologies. 52 FUJITSU. 66, 6, p , 2015
2 多様なサービスを実現するスモールセルソリューション まえがき 1 モバイル市場動向 図 -1 IoT Internet of Things 11 km 100 m 月間平均トラフィック (Gbps) 年で 1.44 倍に増加 LTE 2 本ソリューションの構成と機能 技術 LTE LTE Long Term Evolution 3GPP 3rd Generation Partnership Project ( 年 ) 出典 : 総務省 : 我が国の移動通信トラヒックの現状 (H27 年 3 月分 ) (1) を基に作成 FUJITSU. 66, 6 11,
3 3 3 LTE Wi-Fi 図 -2 LTE PC 構成 1 LTE BroadOne LS100/ Evolved Packet Core LTE LTE LTE LTE LTE User Equipment PC 5 LGW LAN 6 Wi-Fi LTE-Wi-FiWi-Fi 機能 技術 FW main option スモールセルソリューション構成要素 本店 企業内 LTE ネットワーク LGW L2/L3-VPN FW: 企業のファイアーウォール : 企業内で社員のみがアクセス可能な有線 LAN L2/L3-VPN: ex. 広域イーサネットワーク /IP-VPN : 基地局 支店 VPN:Virtual Private Network FUJITSU. 66, 6 11, 2015
4 1 VoLTE Voice over LTE IMS 4 PBX 2 3 LTE TAI Tracking 4 IP Multimedia Subsystem LTE 3GPP Area Identity 図 -3 Pull Push Pull Push IMES Indoor Messaging System GPS 4 LAN LAN FW TAI=11 TAI=12 1 移動 4 TAI=21 LGW 3 L2/L3VPN 2 コンテンツ 1 コンテンツ2 支店 本店 Pull 型機能 1 TAI 受信により, 端末は自身の移動 ( セル単位の位置 ) を検出 2 位置に応じたコンテンツを取得 TAI=11 の場合コンテンツ 1 を取得 TAI=12 の場合コンテンツ 2 を取得 Push 型機能 3 TAI 受信により, 端末は に位置登録動作を実行 それを が System に通知する 4 System が 経由で対応するコンテンツを配信する TAI=21 の場合コンテンツ 1 を配信 -3 SCS Pull /Push FUJITSU. 66, 6 11,
5 LAN 図 -4 LGW LAN LTE 5 図 -5-5 a -5 b -5 c -5 d -5 e 6 LTE-Wi-Fi LAN Wi-Fi Wi-Fi FW 1 本店 企業内 LTE ネットワーク LGW L2/L3VPN 2 支店 1 通常, 端末が企業内 LTE ネットワークの外へアクセスを行うためには 経由となる 2 LGW により, に接続することで, 最短距離での企業内 LAN アクセスが可能になる -4 LAN 56 FUJITSU. 66, 6 11, 2015
6 多様なサービスを実現するスモールセルソリューション (b) 複数基地局間干渉 隣接基地局からの干渉にも自動で対応 (c) マクロ近傍干渉 (a) 隣接基地局干渉 複数設置時のセルスループット向上 マクロ基地局 マクロ基地局からの距離に応じて最適な干渉制御方式を選択 (d) マクロ遠方干渉 (e) 大量基地局干渉マクロ基地局への干渉も低減 基地局 マクロ マクロ への干渉を低減 -5 Web Web 無線部分の混雑度, トラフィック量,Web までのアクセス時間などから,LTE か Wi-Fi かを自動選択して接続を切り替える Select MPTCP MPTCP 技術により,LTE と Wi-Fi を同時利用し, 高速アクセスを実現 LTE Wi-Fi LTE Wi-Fi 接続切替 LTE- LTE- LTE+ Wi-Fi Wi-Fi- Wi-Fi- Wi-Fi- MPTCP LTE+Wi-Fi (a)lte+wi-fi 自動選択機能 (b)lte+wi-fi 同時高速アクセス機能 -6 LTE-Wi-Fi Wi-Fi LTE-Wi-Fi 図 -6 a LTE Wi-Fi LTE Wi-Fi LTE Wi-Fi LTE-Wi-Fi -6 b MPTCP MultiPath TCP TCP LTE-Wi- FUJITSU. 66, 6 11,
7 多様なサービスを実現するスモールセルソリューション Fi 3 LTE- Wi-Fi 4 HTTP MPTCP HTTP TCP 今後の課題と次へのステップ LTE-Advanced LTE LTE 3GPP むすび 参考文献 tsuushin06.html 2 Fujitsu Global Homepage Network Products products/femto/index.html 3 Vol.114 No.297 NS p ARROWS NX F-02G 3 info.html#heading02 58 FUJITSU. 66, 6 11, 2015
8 著者紹介 橋本正則 ( はしもとまさのり ) 岩本秀男 ( いわもとひでお ) FUJITSU. 66, 6 11,
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