NTT DoCoMo to Separate Voice and Data Traffic during Major Disasters

Products & Services

TOKYO, JAPAN, April 8, 2004 --- NTT DoCoMo, Inc. and its eight regional subsidiaries announced today that they would separately manage voice calls and data packet transmissions for some handsets to avoid excessive network congestion during major natural disasters.

The move is expected to increase the ability to successfully transmit text messages to DoCoMo's i-mode® Disaster Message Board service, even if network traffic should rise sharply during a major disaster.

Presently, if network traffic were to become exceedingly heavy during a disaster, DoCoMo could be forced to block traffic in selected areas on a temporary basis to prevent serious degradation of network performance. In some instances, urgent messages sent to the Disaster Message Board could be blocked inadvertently.

By separating management of voice calls and data packet transmissions, DoCoMo expects that text messages will have an increased chance for successful transmission during a disaster, when the traffic of voice calls would likely rise and that of data packet transmissions would be relatively low.

The i-mode Disaster Message Board service, launched on January 17, enables i-mode subscribers in Japan to post text messages on a special i-mode site, rather than making voice calls, to help avoid network congestion. DoCoMo will enable users to try out the service (Japanese only) from 10:00 a.m., April 20 to 5 p.m., April 26.

In a separate measure, DoCoMo users making calls during major disasters will hear an announcement encouraging them to use the i-mode Disaster Message Board service or NTT's disaster message service (dial 171) instead of calling individuals directly, which will also help to reduce network traffic.


About NTT DoCoMo
NTT DoCoMo is the world's leading mobile communications company with more than 48 million customers. The company provides a wide variety of leading-edge mobile multimedia services. These include i-mode®, the world's most popular mobile internet service, which provides e-mail and internet access to over 41 million subscribers, and FOMA®, launched in 2001 as the world's first 3G mobile service based on W-CDMA. In addition to wholly owned subsidiaries in Europe and North America, the company is expanding its global reach through strategic alliances with mobile and multimedia service providers in Asia-Pacific, Europe and North America.
NTT DoCoMo is listed on the Tokyo (9437), London (NDCM), and New York (DCM) stock exchanges. For more information, visit www.nttdocomo.co.jp/english

i-mode and FOMA are trademarks or registered trademarks of NTT DoCoMo, Inc. in Japan and other countries.
NTT DoCoMo's FOMA service is available only to subscribers in Japan.

Go to top of the page