DOCOMO & Fujitsu Develop Counter-Failure Technologies for IP Networks


— Expected to Support Coming Launch of High-Speed LTE Services —

TOKYO, JAPAN, December 16, 2009 --- NTT DOCOMO, INC. and Fujitsu Limited announced today their development of two technologies to detect and locate "silent failures" in IP networks much faster and more accurately than currently possible (see diagrams below).

The new technologies will enable DOCOMO to significantly shorten the time required to recover from silent failures, which will support the eventual launch of extra-high-speed LTE services over DOCOMO's emerging IP-based mobile network.

A silent failure occurs when a router in an IP network fails and data transmission is halted without the network administrator being notified, since routers cannot detect internal failures. Network operators can install dedicated monitoring devices that detect silent failures, but only by continually transmitting test data throughout the entire network and then analyzing the test results, making the process time-consuming.

One of the two new technologies analyzes data on not only test transmissions but also loss rates and network delays, which facilitates faster detection of silent failures. It can also detect warning signs of silent failures that are possibly about to occur.

The second technology identifies the location of silent failures in an efficient manner by analyzing data only from routes over which data is actually being transmitted. In trials conducted on DOCOMO's existing FOMA™ 3G network, the technology identified failure locations by up to 80 percent faster than the conventional method. This technology also enhances conventional network-monitoring systems by analyzing failure and operational data in combination, which improves the accuracy of failure location and enables ordinary and silent failures to be separately identified.

New Technology to Detect Silent Failures

New Technology to Detect Silent Failures

New Technology to Locate Silent Failures

New Technology to Locate Silent Failures

NTT DOCOMO is the world's leading mobile operator and provider of advanced mobile services. The company serves over 55 million customers in Japan, including 48 million using i-mode™, the world's most popular mobile e-mail/Internet platform, and 51 million using FOMA™, the world's original 3G mobile service based on W-CDMA. As a leader in the development of cutting-edge mobile technologies, DOCOMO is continually expanding the role of mobile phones as versatile and highly personalized "lifestyle tools" for everyday life, including with a wide range of innovative services for mobile payments, GPS, mobile TV, multimedia content and much more. NTT DOCOMO is listed on the Tokyo (9437), London (NDCM) and New York (DCM) stock exchanges. For more information, visit

FOMA and i-mode are trademarks or registered trademarks of NTT DOCOMO, INC. in Japan and/or other countries.
FOMA service is only available in Japan.


About Fujitsu
Fujitsu is a leading provider of IT-based business solutions for the global marketplace. With approximately 175,000 employees supporting customers in 70 countries, Fujitsu combines a worldwide corps of systems and services experts with highly reliable computing and communications products and advanced microelectronics to deliver added value to customers. Headquartered in Tokyo, Fujitsu Limited (TSE:6702) reported consolidated revenues of 4.6 trillion yen (US$47 billion) for the fiscal year ended March 31, 2009. For more information, please see:

All other company or product names mentioned herein are trademarks or registered trademarks of their respective owners. Information provided in this press release is accurate at time of publication and is subject to change without advance notice.

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