| Masaaki Yoshimura | CDMA Project, Network Platform Business Development Operation, Information & Telecommunication Systems, |
| Naohisa Hamaguchi | CDMA Development Dept., |
| Takahiko Kozaki | CDMA Development Dept., |
| Masahiro Takatori | CDMA Project, Network Platform Business Development Operation, Information & Telecommunication Systems, |
| Norihisa Higaki | Software Dept., |
Utilizing an identical frequency band (1.25 MHz) to that of the existing cdmaOne* system, the 1xEV-DO (1x evolution-data only) system, which attains high-speed data transmission up to 2.4 Mbit/s (downlink), is expected to be the main platform for next-generation broadband mobile Internet services. At Hitachi Group, we have been actively involved in the concept development and standardization of this technology from the start, and through the development and testing of a trial 1xEV-DO system in collaboration with KDDI CORPORATION, we have successfully launched a 1xEV-DO system commercially. The various characteristics of this 1xEVDO system !) such as a flexible base-station line up, large-capacity network hardware, software upgrading without service interruption, a high-reliability OMC (operation and maintenance center) using a redundancy function, and high engineerability and maintainability !) are presented in this paper.
| * | cdmaOne is a registered trademark of CDG (CDMA Development Group). |
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1xEV-DO |
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QUALCOMM Incorporated |
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Hitachi Communication Technologies, Ltd. (Japanese Only) |
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Hitachi's mobile phone (Japanese Only) |
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The Hitachi Hyoron (Japanese Only) |
CDMA, cdma2000, 1xEV-DO, cellular, data communication
