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Dive into the research topics where Keiichi Nakatsugawa is active.

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Featured researches published by Keiichi Nakatsugawa.


ieee conference on standards for communications and networking | 2015

Extension of OpenFlow protocol to support optical transport network, and its implementation

Shinji Yamashita; Akiko Yamada; Keiichi Nakatsugawa; Toshio Soumiya; Masatake Miyabe; Toru Katagiri

By having the OpenFlow protocol support Optical Transport Networks (OTN) and work as the unified control interface for multilayer (L0-L4) networks, a simple and cost-effective multilayer Software Defined Networking (SDN) controller can be created. Our aim is to propose and standardize the extended OpenFlow protocol to support OTN in Open Networking Foundation (ONF). We describe the approved specification, and the process from proposal to standard. We applied this extension to our OpenFlow controller and OpenFlow agent and succeeded in demonstrating that the extension works as desired in single- and multi-vendor environments. Future directions for OpenFlow extension and modeling of multilayer integrated nodes are also discussed.


Archive | 2001

Packet transfer method for hierarchical packet network, hierarchical packet communication system, and gate node, edge node and mobile terminal for use with hierarchical packet communication system, as well as handover method and routing node for packet network

Hideaki Ono; Tsuguo Kato; Ryuichi Takechi; Keiichi Nakatsugawa; Akiko Tamai; Kazuyuki Oka


Archive | 2003

Application handover method in mobile communication system, mobile management node used in the mobile communication system, and mobile node

Hideaki Ono; Keiichi Nakatsugawa; Yuji Matsumoto


Archive | 2003

Mobile communication system, router, mobile node, and mobile communication method

Keiichi Nakatsugawa; Tsuguo Kato; Kazuyuki Oka


Archive | 2003

Handover method in mobile communication system and router device used in mobile communication system

Hideaki Takusagawa; Ryuichi Takechi; Keiichi Nakatsugawa; Takeshi Kawasaki; Kazuyuki Oka


Archive | 2005

Application handover method for mobile communications system, and mobility management node and mobile node used in the mobile communications system

Hideaki Ono; Keiichi Nakatsugawa; Yuji Matsumoto


Archive | 2005

Network QoS control system and method

Akiko Yamada; Hitoshi Yamada; Keiichi Nakatsugawa


Archive | 2001

Mobile node adapted router and home agent router

Keiichi Nakatsugawa; Tsuguo Kato; Ryuichi Takechi


Archive | 2002

Router and mobile communication terminal for mobile communication network

Keiichi Nakatsugawa; Tsuguo Kato


Archive | 2009

Base Station Device, Wireless Terminal, Wireless Communication Management Device, And Wireless Communication System

Keiichi Nakatsugawa

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