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  7. Fujitsu Develops Push-to-Talk Ubiquitous-Networking Transceiver Technology

Fujitsu Develops Push-to-Talk Ubiquitous-Networking Transceiver Technology

Features superior sound quality and simultaneous voice communication to multiple users

Fujitsu Laboratories Ltd.,Fujitsu Limited

Tokyo, June 29, 2004

Fujitsu Laboratories Ltd. and Fujitsu Limited today announced their joint development of a ubiquitous-networking transceiver technology that enables simultaneous voice communication to multiple users from virtually anywhere, by using mobile phone and wireless LAN networks. The new technology, called "Push-to-talk over Cellular/Wireless" (PoC/W), opens up new opportunities when used with PCs, PDAs, mobile phones and other mobile devices in consumer applications, or as part of enterprise solutions to facilitate interdepartmental group communication.


PoC/W services using IP (Internet Protocol) based on mobile phones and wireless LAN networks, which realize transceiver-type conventional wireless voice communication, are gaining attention. This is because there is anticipation that PoC/W will offer low-cost and easy voice communication to multiples users dispersed across a wide area, leveraging high-speed packet transmission technology that is featured in 3G mobile phones. It is also hoped that PoC/W services will be offered across various business situations. The standardization of PoC/W services is being promoted by The Open Mobile Alliance (OMA), an organization that facilitates the standardization of mobile data services, with over 350 corporate members worldwide.

Technological Challenges

To provide PoC/W services in packet transmission environments in currently available wireless networks, there were problems such as time lags in delivering voice data to recipients and major fluctuations in voice transmission delays that varied during certain times of the day. Smooth voice communication was also difficult, due to frequent sound dropouts and delays in notifying who had speaking rights at a given time.

Fujitsu's New Technology

The new ubiquitous-networking transceiver technology features the following:

1. Minimal lag in delivering voice data, with high-quality voice signals and minimal sound dropouts

A new voice data processing technology was developed, which automatically optimizes sound quality by detecting delays and "jitter" (i.e. intermittent fluctuations) of voice data transmissions in various packet transmission environments, thereby minimizing sound delays and drop-outs.

2. Industry-leading responsiveness

By utilizing the SIP(1) and SIMPLE(2) protocols for management of user status, initiation of simultaneous voice-based communication to multiple parties, and management/notification of speaking rights, in combination with data compression when transmitting during packet-based transmissions in wireless networks, Fujitsu's new technology enables responses in less than one second which is about half the response time of existing services. This enables significantly smoother voice-based communication.


The new ubiquitous-networking transceiver technology was applied with Fujitsu's presence-services platform product, FLAIRINC(3), to enable a PoC/W system featuring industry-leading voice quality and responsiveness, which is used with PCs or PDAs linked to various wireless networks. This system has features that are in accordance with requirements currently under consideration by the Open Mobile Alliance (OMA) for specification standardization. Fujitsu's new technology makes it possible for PoC/W services featuring high-quality sound to be used as part of enterprise solutions and for personal use consumer applications.

Future Developments

Fujitsu plans to test the new technology with a variety of different communication networks, consider application with various devices including mobile phones, and promote further connectivity with enterprise systems. Commercialization of products using the new technology is expected within fiscal 2004 (year ending March 31, 2005).

PoC/W services application examplesPoC/W services application examples

  • [1] SIP

    Session Initiation Protocol, a signaling protocol for Internet conferencing, telephony, presence, event notification and instant messaging. This protocol is standardized by The Internet Engineering Task Force (IETF) as RFC3261, etc.

  • [2] SIMPLE

    SIP for Instant Messaging and Presence Leveraging Extensions, is a SIP extension protocol for Presence and Instant Messaging. Fujitsu Laboratories Ltd. currently plays a key role in contributing to the standardization of the Presence Information Data Format.

  • [3] FLAIRINC

    A Fujitsu presence services platform software package that features real-time notification and communication of status changes ("presence") to users or systems requiring such information. Combining FLAIRINC with enterprise services already in use enables new and more advanced interconnected communication systems.

About Fujitsu Laboratories Ltd.

Founded in 1968 as a wholly owned subsidiary of Fujitsu Limited, Fujitsu Laboratories Limited is one of the premier research centers in the world. With a global network of laboratories in Japan, China, the United States and Europe, the organization conducts a wide range of basic and applied research in the areas of Multimedia, Personal Systems, Networks, Peripherals, Advanced Materials and Electronic Devices.
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About Fujitsu

Fujitsu is a leading provider of customer-focused IT and communications solutions for the global marketplace. Pace-setting technologies, highly reliable computing and communications platforms, and a worldwide corps of systems and services experts uniquely position Fujitsu to deliver comprehensive solutions that open up infinite possibilities for its customers' success. Headquartered in Tokyo, Fujitsu Limited (TSE: 6702) reported consolidated revenues of 4.7 trillion yen (US$45 billion) for the fiscal year ended March 31, 2004.
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Date: 29 June, 2004
City: Tokyo
Company: Fujitsu Laboratories Ltd., Fujitsu Limited, , , ,

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