June 1, 2005:

• Demonstration of Mobile Broadband Communication by 108Mbps wireless LAN Eliminating Packet Loss upon Handover by Adopting New Paradigm
  - will be exhibited at Interop2005 Tokyo(5/8-10) -

ROOT INC. (Headquartered in Bunkyo, Tokyo; Hiroshi Mano, Chief Executive Officer) successfully carried out the demonstration experiment of the system which enables constant connection to the Internet from a moving vehicle with Keio University, The University of Tokyo, Tokyo Institute of Technology and National Institute of Information and Communications Technology in SIMPLE PROJECT (http://www.simple-project.org/about_e.html), which is a collaborative research group comprising government, industry and academic institutes. In the demonstration experiment, 108Mbps broadband network with 5GHz was realized by a special access point for an experiment.

This system realizes constant broadband connection to the Internet from a moving vehicle by IP connection between base routers (5GHz band wireless LAN access points mounted to utility poles along a street) and a mobile router in a car.

Moreover, this system covers general condition required to mobile communication, such as authentication, security and etc. It proves that 100 Mbps mobile communication, which ITU-R recommendation shows as a target of 4G Mobile Communication, is already feasible with present technology.

The demonstration experiment proved that it is possible to realize continuous mobile broadband and voice communication with VoIP technology by making some technical improvements on wireless LAN and systems with mobile IP technology which ROOT INC. originally sells.

The technical improvements are run by making use of outcomes of study of protocol by the joint project members and test bed of National Institute of Information and Communications Technology. ROOT INC. has charge development of access point for an experiment, acquisition radio license for experiment, development of mobile router and implementation of high-speed handover protocol.

• Major Technical Innovation
  Transmission rate up to 108Mbps is achieved by a special access point for an experiment and 802.11a turbo mode.
  Moreover, "Make before Brake" is realized by adopting PDMA which eliminates packet loss upon handover.
  The technical Innovation eliminates the need for multiple access points.

• Applications which were examined in the demonstration test
  • Transmission of high-quality images from a moving vehicle to wired network by DVTS
  • Transmission of high-quality images from wired network to a moving vehicle by DVTS
  • Broadband connection from a moving vehicle to the Internet (WEB Access, Image Delivery, Send and Receive e-mails, Data Transmission and etc.)
  • Voice communication between a Internet user in a moving vehicle and one in an office with Internet telephone.

• System Configuration

• ROOT INC. will exhibit the system at "Interop 2005 Tokyo"
  (http://www.interop.jp/english/index.html) which is held from June 8(Wed) to 10(Fri), while advances the commercialization of the system.

• Joint Research Members
  • Aoyama-Morikawa Laboratory, Department of Information and Communication Engineering / Department of Frontier Informatics, The University of Tokyo
  • Teraoka Laboratory, Department of Information & Computer Science, Faculty of Science & Technology, Keio University
  • Ohta Laboratory, Graduate School of Information Science and Engineering, Tokyo Institute of Technology
  • Wireless Communications Department, National Institute of Information and Communications Technology

• Video of the Experiment
  Video of the experiment is exhibit at Interop 2005 Tokyo (Jun 8, 2005 -Jun 10, 2005, Booth No. 5C01) and coming to ROOT INC. 's website.
  (http://www.root-hq.com/e/information/050617.html)

[Glossary]

• SIMPLE (Smart Internet Mobile Project with Layered Effects)
  A collaborative research group comprising government, industry and academic institutes. They are developing a high-speed mobile communication system with high flexibility by constructing several test beds. Their contributions to industry standardizations include some important technologies, such as packet exchange and layer design.
  URL:http://www.simple-project.org/about_e.html
• DVTS(Digital Video Transport System)
  An application for delivering DV (Digital Video) through IP network.
  It realizes image transports with DVD-like supremely clear vision.
• PDMA(Packet Division Multiple Access)
  One of multiplex systems in which all cells share a single frequency.
  Compared to Frequency Division Multiple Access which was supposed to be most common, PDMA realizes high-speed communication and smooth handover.
• Make Before Break
  A mobile router constantly connects to multiple base routers to ensure connection to the next base router before the connection to the former one is disconnected.
  This method eliminates discontinuity of communication upon switching cells so that users can use applications such as VoIP comfortably.

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