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CDMA2000 1xEV-DO 1xEV-DO
Field :
Portable telephone 3G CDMA2000 1xEV-DO
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The data communication private technical specification which is included in the portable telephone system "cdma2000" standard which applies CDMA technology. It is the specification which improved "1xMC " specification andat portion "of 1xEV " specification, specializing rapidly raises transmission speed in data communication. Powerful apparent what it is done "HDR " of the QUALCOMM corporation is as the concrete technology which actualizesthis. When In JapanK DDI(au), the schedule which from 2002 end of year in 2003 starts service with the down town.
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CDMA2000 1xEV-DO Rev.A EV
Field :
Portable telephone 3G CDMA2000 1xEV-DO Rev.A
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The derivative standard which .Those which furthermoreimprove CDMA2000 1xEV-DO system.1xEV-DO as for the feature of Rev.A, improving of transmission speed, correspondingto multiple cast and the mountingQoS 3. Furthermore, as forformer1xEV-DO,1xEV-DO also "1xEV -DO Rev.0" is calledin order to distinguish with Rev.A.
Transmission speed descends and with former 1xEV-DO 1xEV -DO with Rev.A descends vis-a-vis being maximum2.4Mbpsand rising maximum 144kbps, has become , according to communication environment such as radio wave circumstance while communicating dynamically modulation technique and adaptation irregularity encoding which changes coded rate (AMC: Transmission speed it has improved Adaptive Modulation and Coding)
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CDMA2000 1xEV-DV 1xEV-DV
Field :
Portable telephone 3G CDMA2000 1xEV-DV
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Oneof the technical specifications which are included in the portable telephone system "cdma2000" standard which applies CDMA technology."1xMC " specification was improved atportion"of 1xEV " specification, covers the both of data communication and audio telephone call. Vis-a-vis this, specializing in data communication, those where rapidly it raises transmission speed are"1xEV-DO " specification. Although EV- DV directing to standardization, is the stage where examination is advanced, enterprise of some corporation has made proposition, it has not decided.
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CDMA2000 1xMC
Field :
Portable telephone 3G CDMA2000 1xMC |
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Oneof the technical specifications which are included in the portable telephone system "cdma2000" standard which applies CDMA technology. As for maximum transfer rate 144Kbps. It is called "1x " from the fact that zone 1of 1.25MHz is used, to this developmental shape, bundling zone 3 of 1.25MHz, uses "3x MC " exists as1 channel. With the system which can be utilized with whichever of the 2GHz band and the 800MHz bands, in the Japanese country serviceinthe 800MHz bandis plannedsame as former cdmaOne.KDDI(au) development of the service from 2002 April with this , that is expected from cdmaOne whether it is not to raise predominantly in the price aspect in comparison with the high-speed communication service of other companies.
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CDMA2000 1xRTT CDMA2000 1x
Full spelling : CDMA2000 1x Radio Transmission Technology
Alias :
1x, CDMA 1x and 1xRTT
Field :
Portable telephone 3G CDMA2000 1xRTT
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Oneof the technical specifications which are included in the portable telephone system "cdma2000"CDMA technology As for maximum transfer rate 144Kbps. It is called "1x" from the fact that zone 1 of 1.25MHz is used, to this developmental shape, bundling zoneand so onis includedin cdma2000 1x, it is general, but when such as "1x" simply, to point "1xMC ". In start of the service KDDI from 2001 fall with this system was planned, but start was late from lag and the like of base station equipment, formal service in was 2002 April.
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