•News Center
 •Internet
 •PC
 •This Week
 •From US
 •Japan
 •Taiwan
 •Korea
 •Register Now
 •Directory
 •About Us
 •Advertising Info
 •Nikkei BP Group
 •Links


Advanced Search


(Japanese Site)




















  • Multimedia Council to Disclose Wireless Access Test
  • March 13, 1998 (TOKYO) -- The Multimedia Mobile Access Communication Systems Promotion Council (MMAC) and about 20 companies disclosed results of high-speed wireless access experiments.
    The experiments allowed motion pictures to be transmitted to mobile units using next-generation wireless communications technology. The test results were revealed March 9.

    The council has been developing the technology with an aim to commercialize it around 2002. The group plans to implement high-speed wireless network access for use outdoors and a higher-speed wireless local area network (LAN) for use indoors.

    In the plan, the council aims to transmit a maximum of 25Mbps using radio waves in the SHF band (3-60GHz) for wireless access, and a maximum of 156Mbps using radio waves in the millimeter wave radio band (30-300GHz) for wireless LAN.

    The experiments were publicized at Yokosuka Research Park's YRP Center and NTT Yokosuka R&D; Center in Yokosuka, Kanagawa prefecture, where research organizations specializing in mobile communications and research institutes of electronics makers are concentrated.

    Among exhibits, a Multi-point Video Conferencing Transmission System (See chart.) displayed by NTT Corp. drew the most intensive attention. The display was an experiment with ATM Wireless Access (AWA) to realize high-speed ATM data transmission at terminals on a computer network using wireless communications. NTT achieved transmission speed of a maximum of 80Mbps using the 25GHz band.

    Wireless equipment used for the experiment is about the size of a personal computer with a tower configuration. Two white bars at the back of a display serve as an antenna for the terminal. A black bar with a stand set up at the back of the exhibition site served as an antenna for wireless base station to be connected to a wired backbone network.

    In the future, NTT plans to realize a system to search and display data, including a video conferencing system and motion pictures, using a small-size mobile PC with a wireless capability.

    Other exhibits included: a high-speed (156Mbps) transmission system using the 60GHz band developed by Communications Research Laboratory of the Ministry of Posts and Telecommunications, AWA and a high-speed MPEG2 video on demand system using the 25GHz band developed by Matsushita Communications Industrial Co., Ltd.

    MMAC is a private organization launched in December 1996 by about 130 domestic electronics makers and telecommunications operators.

    Chart: Multi-point video conferencing transmission system

    (return to news)

    (Hi-Tech News Center)


    Copyright © 1997-98
    Nikkei BP BizTech, Inc.
    All Rights Reserved.
    Updated: Thu Mar 12 17:21:33 1998