Talk:Universal Mobile Telecommunications System
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[edit] Releases 5,6,7
This article only mentions old UMTS features. During 2005 release 5 is rolling out over the world, which simply spells out to VoIP. I added a link to the IMS article, but this one needs some serious restructuring. /Henrik Leion
So is UMTS used for making video+voice calls?
- Yep. UMTS-networks deployed (at least in Europe) support video+voice calls and have done so for quite some time now (i have such a phone myself).– Probell (Talk) 09:07, 19 September 2005 (UTC)
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- this article is too much around the USA I think. Almost any mobile phone sold in europe is triband because the US have different frequencies from worldwide. 62.48.109.85 (talk) 21:52, 7 January 2008 (UTC)
[edit] Cleanup Request
This article is choppy and hard to read and does not seem to reflect the current status of the UMTS systems and phones. I also strongly feel that the introduction should be about UMTS and not about how great other standards are. – Probell (Talk) 09:24, 19 September 2005 (UTC)
Also I disagree that this article should be placed underneath the one on WCDMA. The correct order is 3G > UMTS (as a family) > WCDMA, TD-SCDMA (as family members) Alistair9210 14:22, 26 December 2006 (UTC)
If you're talking about the Mobile phone standards table, I proposed a clean up here but haven't done it yet because it's somewhat radical and I've only had one piece of feedback so far. If you'd like to comment, I'd be very grateful. Squiggleslash 14:05, 27 December 2006 (UTC)
The comment about certain services not working in ireland's UMTS networks has relatively little relevance. I suggest removing it. --193.53.0.59 16:19, 30 October 2007 (UTC)
[edit] Updates
Hello what is UMTS
I've made a stab at making the article more up to date but it could do with more work.
The AWS auctions in the US happened last month. It seems probable that both Cingular and T-Mobile (the latter of whom has announced this publically, see footnotes) will be running UMTS on 2150/1750 nationwide. There doesn't appear to be any move to use the same frequencies as Europe, and personally, I doubt there will be, due to the 5MHz issue and the fact that licensed frequencies in the 2150MHz range may not match up with their equivalents in the 1900MHz area. Someone who knows more about it than I do though should probably clear that issue up.
I've also added a footnotes section, and a clean-up should probably consider moving many of the links to that area.
Over all, I think the article is in need of a clean-up, and possibly a rewrite. There's too much redundancy (I had to fix speculation about the US UMTS roll-out and claims the FCC hasn't free'd any relevent spectrum in three separate sections!), much of it seems to be based upon speculation that I doubt was in question even when the article was written. What do others think? Squiggleslash 13:31, 24 October 2006 (UTC)
It should probably also be noted that Vodafone's Japanese operation was bought by Softbank in March 2006. Vuori 20:59, 22 December 2006 (UTC)
[edit] UMTS in Russia
That little paragraph about UMTS in Russia is total nonsense. Mentioned Skylink is a CDMA2000 450MHz operator that recently launched EV-DO in Moscow with a very fragmented EV-DO coverage still. UMTS is going to be developed by major GSM operators, but to the date it is not. schmalter194.84.64.191 19:30, 6 December 2006 (UTC)
[edit] UMTS and CDMA
I came to this page to learn what UMTS was and I am still confused. Is it nothing more than a data protocall usually used with W-CDMA over GSM networks? I also found the wording slightly biased. "UMTS over W-CDMA uses a pair of 5 MHz channels. In contrast, the competing CDMA2000 system uses one or more arbitrary 1.25 MHz channels for each direction of communication. UMTS and other W-CDMA systems are widely criticized for their large spectrum usage, which has delayed deployment in countries that acted relatively slowly in allocating new frequencies specifically for 3G services (such as the United States)." If I remeber correctly W-CDMA was a creation of a few European companies to try and not pay royalties by widening the bandwidth, so that they could overlay existing GSM networks with CDMAto get the higher data speeds. Which they lost in court a few years ago. If we are going to talk arbitrary (see arbitrary above)maybe we could discuss the history of this thing some more. Although I believe the FCC is not the greatest institution by a long shot. I still need a good explanation of UMTS to decide if I need to study it more to remain up to date in my field. Thank you for your time Ljgebbia 10:38, 1 March 2007 (UTC)ljgebbia
- UMTS is a complete mobile phone standard, like GSM is. It is often described as GSM version 3.
- W-CDMA is an air interface specification. That means it's a standard that explains the part of a mobile phone network where the handset itself communicates with the towers. W-CDMA was originally developed by the Japanese telecommunications giant DoCoMo, for their own slightly different mobile phone standard called FOMA.
- Unlike earlier versions of GSM, which were originally tied to a specific FH-TDMA air interface (though others were standardized later on, like DECT), UMTS is able to support multiple, standardized, air interfaces.
- W-CDMA is one air interface used by UMTS. There's also TD-CDMA (used exclusively by UMTS-TDD), TD-SCDMA (a Chinese standard), and HSOPA (developed as a replacement for W-CDMA, essentially because CDMA is not the fantastic solution to all problems it was claimed to be.)
- W-CDMA was chosen as the air interface for UMTS because it was felt better to handle the kinds of application that UMTS was planned to support (such as video calls) than Qualcomm's implementation of CDMA. It is not true that it was developed to try to dodge Qualcomm's patents and royalties, Qualcomm has many patents covering W-CDMA, and W-CDMA isn't that different from Qualcomm's own implementations. Qualcomm's supporters are infamous for casting FUD on non-Qualcomm initiatives, and that you'd think this isn't surprising.
- You cannot overlay W-CDMA signals and GSM2 because the noise generated by the W-CDMA network would interfere with the GSM2 network; different frequency bands have to be used (and a different tower placement strategy, and a lot of other things...) Indeed, this is much of the reason why UMTS has been slow to roll out in the US, as in many areas GSM operators only have 5MHz to play with, and implementing UMTS means dropping GSM.
- The only connection with GSM is that UMTS is the latest version of GSM, and W-CDMA is the most common air interface used with it. But it's essentially the latest in the same way as CDMA2000 is the latest version of AMPS. You can't overlay one on the other, and the newer system is much more capable than the old system (though it's unfair to compare GSM to AMPS!)
- Because the terminology is confusing, you often here people refer to UMTS as W-CDMA or 3G. These are misleading terms as they encompass different concepts. If you live in a country where the only 3G networks are UMTS, run over W-CDMA, then it kind of makes sense, but it doesn't.
Does that help? --Squiggleslash 13:32, 1 March 2007 (UTC)
[edit] R99?
- users in deployed networks can expect a performance up to 384 kbit/s for R99 handsets
The term "R99" is not defined. AxelBoldt 04:42, 15 January 2007 (UTC)
[edit] 3GSM
"3GSM," which redirects here, is also used to refer to the 3GSM World Congress (in Barcelona next month). Should we reference that? --Miguel 16:52, 16 January 2007 (UTC)
[edit] Anyone knows the frequency of Cingular's (AT&T) UMTS service in Puerto RIco?
I talked with one the guys from Cingular's customer service/store and he told me Puerto Rico's UMTS frequency was 2100 MHz. I wish to know if this is true because my HTC Universal supports this and only this frequency. As it says in this article Cingular has only so far rolled out 1900 and 850 UMTS... But Puerto Rico Being another country with different set of spectrum rules I wouldn't be surprised if it was true. Any thoughts about this? Or, at least, some place where I can know this type of info for sure? Thanx in advance.
Yubal 20:06, 10 February 2007 (UTC)
[edit] Usable uplink speeds?
What are the typical uplink speeds for UMTS/HDSPA networks?
[edit] Power emission unspecified
Hi, I saw there is no specification for power consumption for UMTS, so it isn't informational enough. There is also nothing about ecological, health and biohazard concerns in UMTS nor GSM articles.
This link says UMTS runs 2W peak power, but it is not clear whether it is peak power of a pulse, or averaged power of pulses and silences together. I suspect the former, otherwise the battery would go empty very quickly, but IMHO it needs clarification. Thx -- Mtodorov 69 13:34, 7 May 2007 (UTC)
