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BDFL - Memuneh
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Reply # 19395 31-Aug-2005 12:33
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ITU 3G definition, aka IMT2000



Wikipedia entry on 3G:

3G technologies are an answer to the International Telecommunications Union's IMT-2000 specification. Originally, 3G was supposed to be a single, unified, worldwide standard, but in practice, the 3G world has been split into four camps.

UMTS (W-CDMA)
UMTS (Universal Mobile Telephone System), based on W-CDMA technology, is the solution generally preferred by countries that used GSM, centered in Europe. UMTS is managed by the 3GPP organization also responsible for GSM, GPRS and EDGE.

FOMA, launched by Japan's NTT DoCoMo in 2001, is generally regarded as the world's first commercial 3G service. However, while based on W-CDMA, it is not generally compatible with UMTS (although there are steps currently under way to remedy the situation).

CDMA 2000
The other significant 3G standard is CDMA2000, which is an outgrowth of the earlier 2G CDMA standard IS-95. CDMA2000's primary proponents are outside the GSM zone in the Americas, Japan and Korea. CDMA2000 is managed by 3GPP2, which is separate and independent from UMTS's 3GPP. The various types of transmission technology used in CDMA2000 include 1xRTT, CDMA2000-1xEV-DO and 1xEV-DV.

CDMA 2000, has a data rates of 144 kbit/s to over 3 Mbit/s. Adopted by the International Telecommunication Union ITU

Arguably the most successful introduction of CDMA-2000 3G networks is Japan's KDDI, which under the AU brand has more than 20 million 3G subscribers. Since December 2003, KDDI has upgraded the CDMA2000-1x network to CDMA2000-1xEV-DO which achieves data rates up to 2.4 Mbit/s. In 2006, AU plans to upgrade the network to above 3 Mbit/s.

TD-SCDMA
A less well known standard is TD-SCDMA which is being developed in the People's Republic of China by the companies Datang and Siemens. They are predicting an operational system for 2005.

Wideband CDMA
Supports speeds between 384 kbit/s and 2 Mbit/s. When this protocol is used in a WAN, the top speed is 384 kbit/s. When it is used in a LAN, the top speed is 2 Mbit/s. Also adopted by the ITU.

UMTS TDD
Supports speeds of up to 3 Mbit/s.


The Wikiepedia entry on IMT2000:

IMT-2000 (International Mobile Telecommunications-2000) is the global standard for third generation (3G) wireless communications as defined by the International Telecommunication Union.

In 1999 ITU approved five radio interfaces for IMT-2000 as a part of the ITU-R M.1457 Recommendation. The five standards are:

IMT-2000 CDMA Direct Spread
also known as W-CDMA or UTRA-FDD, used in UMTS
IMT-2000 CDMA Multi-Carrier
also known as CDMA2000, the successor to 2G CDMA (IS-95)
IMT-2000 Time-Code
this summarises UTRA-TDD (standardised in UMTS) and TD-SCDMA
IMT-2000 TDMA Single Carrier
also known as EDGE, an intermediate 2.75G technology
IMT-2000 FDMA/TDMA
also known as DECT




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Reply # 19397 31-Aug-2005 12:59
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I don't know Johnr - I guess the ITU will decide what 4G is. But I did hear and I could be wrong that 4G is 100Mbps down and 20Mbps up.

 
 
 
 


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Reply # 19418 31-Aug-2005 15:15
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Jama: No - I wont give up. People need to understand there is no such thing as 2.75 or 2.99G. It is 2G, 3G and soon 4G.


Maybe 1xRTT just doesnt quite have enough G

Tounge firmly in cheek here

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Reply # 19723 5-Sep-2005 21:54
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Hi guys,
just a word of advice. It may not be a wise idea to be posting any information on upcoming devices (from either voda or Telecom) on this (or any other) site.
Recently investigations at one of the companies into information that has been posted on this forum have led to job dismissals and may result in further legal action.
Rule of thumb, post what you know (don't guess / make it up), and if there's any chance it could be confidential, don't do it.
Easy
Felix




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Reply # 19724 5-Sep-2005 22:00
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Hey Felix thats just common sense. I don't post unless its in the media and can be found on google

BDFL - Memuneh
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Reply # 19725 5-Sep-2005 22:02
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Very good advice... It is good to make it clear that we do not ask people to disclose any confidential information, and anything that is private property (commercial sensitive, product descriptions, etc) should not be disclosed if it will result in the breach of confidentiality agreement, NDA (Non Disclosure Agreement) or common sense.





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Reply # 19750 6-Sep-2005 09:31
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heheh... 2G, 3G, 4G, G-Force....


then you get floating point G .... gosh. so many Gs.... is there a G-Spot? LOL



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Reply # 19860 8-Sep-2005 20:52
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From another thread:
s.joseph: Managing to break my harrier im now looking for a new evdo phone, i decided to look to see that telecom dont have any evdo phones?, i want to get a nokia 6265 if it comes out but its cdma 1x?, what are the upcomming evdo phones?, if telecom shut down the 1xrtt network when will it be?

There are no plans to shut down Telecoms 1xRTT network soon. In fact after CDMA being improved with 1xRTT, then EVDO, Telecom plan to add EVDO revision A next year to further improve data speeds.

There is little reason for many people to have EVDO on a phone - Telecom can already stream video, wap, ringtones, voice, sms and p2t through the 1X system.

Even on a basic data plan ($10), an EVDO PCMCIA card can be had for zero cost.

Although I do accept that for a small (and growing) segment of the market, EVDO through a handset is desirable, and to that end, I am sure we will see EVDO capable handsets more frequently before too long (mere speculation on my part - before anyone jumps on me I am not 'in the know' about Telecoms upcoming handsets, and am not breaking anyones NDA)




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Reply # 19879 9-Sep-2005 10:14
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Likewise, I can't see the 1xRTT network being taken down at all, particularly since it's just part of the backwards compatibility in the network. The same as the IS95 support (14.4k data - ie: the first set of phones they released like the Kyocera 2135, 3035,etc.).

No ideas where it's going after Rev A, but there's no reason for them to disable any of the IS95 or 1xRTT support.

Likewise, not privledged information, just my opinion. ; p




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Reply # 19975 12-Sep-2005 15:33
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does any one no anything about the nokia 6265 being relaeased

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Reply # 20730 29-Sep-2005 13:10
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freitasm: Yes, it is 3G, according to the ITU. Actually under certain conditions even CDMA 1xRTT was considered 3G. However I am more conservative and would consider 3G anything with speeds of 384kbps and up.



You sir, are correct :)

3G Network is pretty cool. It's been out in Hong Kong and Japan for quite a while. Due to the higher transfer rates, you can do a lot more. Plus instant messaging and WAP is a lot more enjoyable.

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