WCDMA

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NerdBoy - 17 Oct 2003 21:59 GMT

How come everytime I hear about WCDMA, its always the flavor that has a max
data rate of 384Kbps, instead of the max 2 megabit per second that the
technology can allow. I realize the data rates will be much less than this,
which is why I asked. A max data rate of 384K probably will not deliver
video under real world conditions, so why are they going with it?

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Mike
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" The boy is dangerous, they all sense it."

Star Wars Episode One

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Wayne - 26 Oct 2003 02:30 GMT

there are many variables to consider which will affect the TPT... for
the case of WCDMA (I assume you're refering to the UMTS implementation -
as opposed to the 1XEV flavor) the theortical max TPT is 2 Mbit/sec.

However, for "real-life" conditions such as stationary person, the max
TPT was quoted at about 384kbps. Of course, if you were driving on the
highway, your estimated TPT maybe considerably less ~ 100 kbps.

If you want to learn more - you should check out the white papers on the
3GPP (& 3GPP2) forums.

Wayne

> How come everytime I hear about WCDMA, its always the flavor that has a max
> data rate of 384Kbps, instead of the max 2 megabit per second that the
> technology can allow. I realize the data rates will be much less than this,
> which is why I asked. A max data rate of 384K probably will not deliver
> video under real world conditions, so why are they going with it?

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NerdBoy - 27 Oct 2003 20:05 GMT

So in other words, the maximum is 2Mbps but in real life it is only going to
hit around 384Kbps? I thought it was a case of which standard of UMTS they
deployed, i.e. that there was another UMTS standard that boosted the data
rate from 384Kbps to 2 Mbps (not 1xEV).

Signature

Mike
(A+)
" The boy is dangerous, they all sense it."

Star Wars Episode One

> there are many variables to consider which will affect the TPT... for
> the case of WCDMA (I assume you're refering to the UMTS implementation -
[quoted text clipped - 14 lines]
> > which is why I asked. A max data rate of 384K probably will not deliver
> > video under real world conditions, so why are they going with it?

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Wayne - 27 Oct 2003 23:01 GMT

Mike,

not that I know of... but if what we see in the case of 2G services
(i.e. 2G {GSM} -> 2.5G {GPRS} -> 2.75G {EDGE}) holds true then UMTS may
follow the same type of incremental improvements; that is 3G -> 3.xG

Of course, we're excluding CDMA/1XEV & only discussing GSM/UMTS.

Wayne

> So in other words, the maximum is 2Mbps but in real life it is only going to
> hit around 384Kbps? I thought it was a case of which standard of UMTS they
> deployed, i.e. that there was another UMTS standard that boosted the data
> rate from 384Kbps to 2 Mbps (not 1xEV).

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