Evolution of The Mobile Phone Communication Industry (What is 1Seg?

Present Technologies
Mobile communications technology has made giant strides over the past decade, rapidly moving from first-generation (1G) analog voice-only service to second-generation (2G) digital voice and data communications. These 2G technologies include IS-136 (also known as US-TDMA and Digital AMPS) in the U.S.; GSM in Europe which became a popular standard worldwide; and PDC (Personal Digital Communications) in Japan. NTT DoCoMo's third-generation (3G) FOMA (Freedom Of Mobile multimedia Access) service, based on W-CDMA, has now shifted the mobile communication environment to the next level. This advanced new service not only provides voice transmission quality on a par with fixed-line communications, it also supports diverse multimedia content.

As part of the transition from 3.5G to 4G, NTT DoCoMo is engaged in research to create networks with even higher speeds and larger capacity. Currently, HSDPA (3.5G) can achieve speeds of up to 14 Mbps even when using the same 5 MHz frequency band as W-CDMA (3G). This service was timetabled for introduction in the second quarter of FY2006 (ending in March 2006).

Future Technologies

In addition to Audio Barcodes and 3D Display System introduced in the world presently, cutting-edge technologies beyond the imagination are already under development. These include a system that makes distant objects feel like an extension of the human body for ultra-realistic experiences, and advanced chips that will allow items such as household appliances to communicate. What's more, we are actively realizing 4G technology such as MIMO (Multiple-Input-Multiple-Output) multiplexing technology and a wireless access communications system, as well as contributing to the establishment of specifications for global standardization.

Researchers have a clear vision of the future. A future that will unite all of the above advances and many more, to create a world where people can communicate at a higher level, regardless of time and space.



1seg

1seg is a mobile terrestrial digital audio/video and data broadcasting service in Japan. Service began experimentally during 2005 and commercially on April 1, 2006. The first mobile phone handsets for 1seg were sold by KDDI to consumers in autumn 2005.

Terrestrial digital broadcast in Japan (ISDB-T) is designed so that each channel is divided into 13 segments (plus one segment for separating channels). HDTV broadcast occupies 12 segments, and the remaining (13th) one segment is used for mobile receivers. Thus the name, "1seg" or "One Seg".




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