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NTT DoCoMo to Implement New Congestion Control System for 3G FOMA Network


—Voice and Packet Data Traffic Congestion to be Controlled Separately—

TOKYO, JAPAN, August 21, 2006 --- NTT DoCoMo, Inc. and its eight regional subsidiaries announced today that they would separately manage call and data packet transmission congestion over the 3G FOMA™ network to prevent voice traffic congestion control from affecting packet communication traffic and vice versa.

Currently, excessive congestion in either voice or data transmissions can force DoCoMo to limit network usage for both voice and data in order to prevent network breakdown.

One result of the move is the increased ability to successfully transmit text messages via i-mode mail, or to DoCoMo’s i-mode™ Disaster Message Board service, even if voice traffic should rise sharply during a major disaster. The i-mode Disaster Message Board service, launched on January 17, 2004, enables i-mode subscribers to post text messages on a special i-mode site.

The new system will initially apply only to selected handsets — D902iS, F902iS, N902iS, P902iS, SH902iS, DOLCE SL, SH702iS, D702iF, N702iS, P702iD, and N902iX HIGH-SPEED.

A similar control system for the 2G mova™ network was implemented in April 2004.

About NTT DoCoMo
NTT DoCoMo is the world’s leading mobile communications company. DoCoMo serves more than 51 million customers, of which more than half subscribe to FOMA™, launched as the world’s first 3G mobile service based on W-CDMA in 2001. DoCoMo also offers a wide variety of leading-edge mobile multimedia services, including i-mode™, the world’s most popular mobile e-mail/Internet service, used by more than 46 million people. With the addition of credit-card and other e-wallet functions, DoCoMo mobile phones have become highly versatile tools for daily life. NTT DoCoMo is listed on the Tokyo (9437), London (NDCM) and New York (DCM) stock exchanges.
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i-mode, mova and FOMA are trademarks or registered trademarks of NTT DoCoMo, Inc. in Japan and other countries.
NTT DoCoMo’s FOMA service is only available to subscribers in Japan.


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