The number of cellular subscribers continues toincrease, creating a large market. This growth in subscribers isoonsldered to have been mainly supported by market needs. Asecond factor is that new services and attractive small handsetshave been supplied to the market.This paper examines the technological trends supporting thegrowth in this market in terms of mobile communication terminalssuch as personal digital cellular (PDC), the personal handy-phonesystem (PHS), and cdmaOne. First, the shift from analog todigLtal systems and trends in mobile data communications aredescribed, then the standardization situation of IMT-2000(International Mobile Telecommunication 2000), the next-generation mobile communication system, is reported. Next, theelement technologies that have enabled attractive handsets to berealized are described.These development efforts in the mobile telephone field aresupporting the growth of the market.
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