A. Hakata

Fujitsu Ltd., Kawasaki Si, Kanagawa, Japan

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Publications (5)0 Total impact

  • A. Hakata · M. Katoh · H. Yamashita · S. Nojima
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    ABSTRACT: This paper proposes a next-generation IP core transport network architecture that fully utilizes the features of a photonic network. To cope with the IP traffic trends and users' demands for Quality of Service (QoS), we propose a virtual router network paradigm to make the public network operate and look like a single virtual router. Also, we present a traffic-engineering scheme and a network protection scheme for ensuring a high utilization of network resources and a high reliability.
    No preview · Article · Jan 2001
  • T. Kato · T. Ishibara · M. Wakamoto · M. Katoh · A. Hakata · A. Rouz
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    ABSTRACT: The number of the mobile subscribers has been increasing. At the same time, the scale of the Internet is still rapidly increasing. This means that the next generation of mobile networks should handle not only voice but also multimedia data, including still images and video based on the IP protocol, without restriction. We propose a mobile network architecture for the multimedia age based on a mixed model of ATM connectionless and connection-oriented method. We also propose an efficient mobility management mechanism and analyze its effectiveness by simulation
    No preview · Conference Paper · Feb 1999
  • Y. Fujii · K. Miyazaki · S. Kuroyanagi · T. Chujo · A. Hakata
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    ABSTRACT: We describe an approach to WDM network management, especially addressing issues related to the restoration function. We also introduce a prototype management system for optical cross-connect networks that we have developed. We discuss the restoration algorithm which is adopted in the prototype system, and present results with respect to the restoration function, such as the required restoration time. Moreover, the implementation of fault and performance management in the prototype system is explained. After that, the used network design method is described, with special attention to spare capacity allocation and we present an evaluation of the restoration algorithm by simulation of the designed network
    No preview · Conference Paper · Feb 1999
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    ABSTRACT: The explosion of the Internet is still continuing due to the expansion of the number of users and multimedia services. To replace the conventional router network, a new paradigm of some multi-layer switching techniques are proposed in the standardization sectors and forums. We estimate the best solution for a very large scale Internet backbone, i.e. a nationwide scale. After estimating the size of the Internet in the future, we study the high speed internetworking solutions. We especially compare the multiprotocol label switching (MPLS) and CL (connectionless)-network from the view point of scalability and the size of the buffers of each node
    No preview · Conference Paper · Feb 1998
  • Y. Kamigaki · T. Nara · S. Machida · A. Hakata · K. Yamaguchi
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    ABSTRACT: The ATM (asynchronous transfer mode) network is regarded as effective for a multimedia telecommunication environment that enables high-speed and broadband communication. This paper reports the development of the FETEX-150 ESP (Enhanced Switching Platform) which has been designed as an ATM switch in a public broadband network. To track the latest ATM standards and trends, a simple, scaleable, and open architecture was set forth for the FETEX-150 ESP design target at the beginning of the system design. This paper describes design concept and system architecture of the FETEX-150 ESP system from hardware and software design viewpoint. Also, this paper describes traffic management, system features and operation and maintenance features in the FETEX-150 ESP
    No preview · Conference Paper · Dec 1996