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maemo.org - Talk (https://talk.maemo.org/index.php)
-   Nokia N900 (https://talk.maemo.org/forumdisplay.php?f=44)
-   -   N900 utms? (https://talk.maemo.org/showthread.php?t=33258)

china 2009-10-22 04:29
Re: N900 utms?
 
Quote:
Originally Posted by texaslabrat (Post 354235)
I highly doubt that the N900 will work with TD-SCDMA based 3G services. It is a fundamentally different technology from W-CDMA...one is time-division and one is frequency-division. Maybe compatibility is an "undocumented feature", but I wouldn't hold my breath.
can anyone confirm this?

kyoleon 2009-10-22 04:40
Re: N900 utms?
 
Quote:
Originally Posted by Rauha (Post 354799)
As far as I know, China Unicom is only chinese network that uses W-CDMA 3G.
Correct!


(Words Patch.EXE)

china 2009-10-22 10:03
Re: N900 utms?
 
So, will the N900 support both WCDMA and TD-SCDMA?

SubCore 2009-10-22 10:11
Re: N900 utms?
 
Quote:
Originally Posted by china (Post 355171)
So, will the N900 support both WCDMA and TD-SCDMA?
sorry to say, but no, it won't.

china 2009-10-22 10:14
Re: N900 utms?
 
Quote:
Originally Posted by SubCore (Post 355177)
sorry to say, but no, it won't.
I'm looking for a more technical answer here.... how can you be so sure?

SubCore 2009-10-22 10:17
Re: N900 utms?
 
Quote:
Originally Posted by china (Post 355180)
I'm looking for a more technical answer here.... how can you be so sure?
because of this:
http://en.wikipedia.org/wiki/TD-SCDM...cal_highlights

time division duplexing and frequency division duplexing are quite different.

edit:
a quick google search found this:
http://www.theunwired.net/?item=comp...mobile-handset

"While the rest of world uses W-CDMA for 3G services, China decided to use TD-SCDMA for its 3G service with the general problem that not too many TD-SCDMA compatible handsets are available today."

DannStarr 2009-10-22 10:31
Re: N900 utms?
 
I'm still caught up in this "does n900 use Sim cards" business....

My natural assumption for any mobile phone is that it uses sim cards.... Can anybody tell me of a mobile phone that doesn't?

china 2009-10-22 10:38
Re: N900 utms?
 
Quote:
Originally Posted by SubCore (Post 355184)
because of this:
http://en.wikipedia.org/wiki/TD-SCDM...cal_highlights

time division duplexing and frequency division duplexing are quite different.

edit:
a quick google search found this:
http://www.theunwired.net/?item=comp...mobile-handset

"While the rest of world uses W-CDMA for 3G services, China decided to use TD-SCDMA for its 3G service with the general problem that not too many TD-SCDMA compatible handsets are available today."
I prefer to wait for someone who can provide me with an answer regarding the specific capabilities of the N900.

In what way does your post indicate that the N900 does not support TD-SCDMA? The link you sent me was dated 2007, and about some WinMo phone that China mobile is testing

SubCore 2009-10-22 10:45
Re: N900 utms?
 
this link was only supposed to show you that there is no compatibility between w-cdma and td-scdma (otherwise china would not have the "general problem" mentioned.)

and since the n900 specs do not list td-scdma, only w-cdma, it won't work. td-scdma is a different technology, with different hardware.

china 2009-10-22 11:37
Re: N900 utms?
 
This is what I was looking for: http://www.tdscdma-forum.org/en/news...ime=2009-10-19.

Unless the N900 has a dual-mode FDD/TDD chipset, then it won't support TD-SCDMA.

TD sounds promising. http://www.tdscdma-forum.org/en/pdfw...7463050335.pdf and with the majority of gloabl mobile subscribers in China.. this may be something Nokia will want to look into over the next few years.

Luckily for me (and others) there is WCDMA access in China (Unicom)... it seems the largest problem regarding the N900 is actaully getting one over here ::thumbs::


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