1.Outline

CDMA can efficiently utilize the limited frequency resources available and accommodate as many users as possible. This is achieved by sharing frequencies on the basis of spectrum-spread codes assigned to each user, rather than through dividing broadband channels by frequency or time.

Among the various systems, DOCOMO is promoting the introduction of W-CDMA that can transmit high-quality moving images in addition to voice and fax, and also allows for connections to the Internet. As it offers many benefits such as high transmission quality and needs little power for transmissions, W-CDMA is the most suitable technology to meet the objectives of third-generation mobile communications -- namely, multimedia, personal and intelligent systems.

By combining W-CDMA with the asynchronous transfer mode, which is the most effective technology to process text and image information in addition to voice on an integrated basis, it is possible to structure a mobile, multimedia integrated communications system that enables high-speed, flexible and efficient transmissions.

Targets of Third Generation Communications Systems

Created 1999/03

Updated 2004/03