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Christian

There's an overview of UMTS bands on Wikipedia: http://en.wikipedia.org/wiki/UMTS_frequency_bands

I wonder when we will finally see chipsets capable of supporting more than three UMTS-frequency bands in one device.

Takeshi Suyama

Hello. DOCOMO has kept thier 2G network for legacy devices only. Actually DOCOMO don't sell dual-mode devices now, and they sold just one dual-mode device N2701 in 2003. The main reason of DOCOMO started 3G network is that their 2G network couldn't meet the increasend demand for their service due to limited bandwidht, so dual-mode devices interfared with DOCOMO's aim. Moreover, DOCOMO's 3G network coverrage has been increasing very fast, and most people are satisified with 3G only devicses. Now, DOCOMO's 3G netowrk coverage is wider than their 2G network.

You may find some diffculties in reading. Sorry for poor English.

David

I agree with you. DoCoMo will remain an exception for a long time: I do not see GSM operators switching off their GSM networks in the five next years. Also, these dual mode phones might be more expensive than a pure 3gpp phone due to lack of scale.

mobilesociety

Hi Christian,

Yes, 5-band 3G (850, 900, 1900, 2100 and 1700/1900) band support would be even nicer :-) This would cover Europe and the US and the main 3G band in Japan (but not their 800 MHz band). O.k. 6-band then :-)

Cheers,
Martin

David Boettger

Actually, a few years back, Japan restructured its 800 MHz spectrum. Now there is complete overlap between North American "850 MHz" and Japan "800 MHz" allocations. The duplex spacing is 45 MHz in both cases. The main difference is that the allocation in Japan is only 10x10 MHz, whereas it's 25x25 MHz in North America. It should require no hardware and only a little software to get a North American 850 MHz phone to work in Japan which, I think, was the whole point.

Christian

@David
Does an American 3G device actually require modification in order work in Japan? Not only is band VI (Japan) a subset of band V (Americas) in terms of frequencies, but the channel numbers of band VI (UARFCN) are within the range of band V's channel above).numbers (check the Wikipedia article linked
Band VI seems just to be a cut band V.

David Boettger

@Christian
I suppose I was being conservative. 3GPP went through the trouble to define an 800 MHz band for Japan, as distinct from North American 850 MHz, so I presumed there must be some specific software requirements for a Japan 800 MHz-compatible device.

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