Talk:CDMA2000/Archive 1

CDMA2000 around the World
Question/request--can someone please add the formal names of the specification documents for 1x and 1xEV-DO?

In general the article doesn't touch much on the fact that these systems are pretty much limited to the USA - and even there do not completely dominate.

However, in New Zealand the Telecom offering marketed as "T3G" is EV-DO.

Does CDMA technology offer roaming services in different countries? Apart from voice clarity/better network reception, what is the other benefit of CDMA over GSM? - Pranav.

As you noted CDMA2000 is also in New Zeeland. Vivo, the largest operator in Brazil, also uses CDMA2000. There are additonal CDMA2000 systems in other parts of South America, Australia, Africa, Eastern Europe and 19 CDMA2000 operators in Asia! It's more than just a North American Technology!

In fact, CDMA2000 subscribers in Asia-Pacific Region outnumber CDMA2000 subscribers in North America.

CDMA2000 is the dominant 3G technology in Japan where KDDI has 63.5% of the 3G subscribers.

Weblinks
Someone should remove/fix the direct weblinks inside article to ref section or whatever, AFAIK it is wiki rule.

PCS
"PCS" or "Personal Communications System" refers to a frequency band, not a cellular interface technology. In fact, the statement on this page was entirely incorrect: The largest provider in the US to use the PCS band is Sprint PCS, which uses... CDMA2000!

Link
I changed the link to D-AMPS, the technology used by AT&T which was commonly referred to as "TDMA." This is a factually correct statement. --66.31.77.166 29 June 2005 22:55 (UTC)

India
I looked up the websites of the 3 Indian operators listed as supporting CDMA2k (BSNL, Reliance and Tata Teleservices) and only one of them - Tata - seems to support this technology, the other 2 are GSM.

Max Active Set Pilot
This is a parameter which will limit the number of pilots in the active set. This can be operator defined to prevent the weakest pilot(s), even though they qualify through the soft slope algorithm, from being involved in the traffic channel. Is this parameter a useful one or not. I put this across to the CDMA community for its suggestions and inputs.

Narayanan.N Ericsson.


 * This discussion page is for the encyclopedia entry, and is not an appropriate forum for your question. But I will answer it anyway:  the Max Active Set Pilots parameter is useful if the operator is concerned about limited BTS resources being used up by pilots which are not contributing much to the traffic channel.

DylanW 11:56, 15 January 2006 (UTC)

CDMA channels
Hi, The access channel is used for originations. The paging channel for control and paging. Can a mobile listen on both the access channel and paging channel at the same time? Comments are welcome!!

Shiv


 * This discussion page is for the encyclopedia entry, and is not an appropriate forum for your question. But I will answer it anyway:  the mobile does not listen on the access channel, it only transmits on it.

DylanW 11:56, 15 January 2006 (UTC)

Make up your minds
So, is CDMA2000 3G or not? This article says it is, but the column on the right states it still falls under 2G. I think for the time being, the only things we can qualify as 3G are UMTS, WCDMA, FOMA, etc, and the other listed there.


 * Good question. CDMA2000 standards are all 3G because a) they have been published by 3GPP2 (third generation partnership project), b) they are designated by ITU (International Telecommunication Union) as IMT-2000, c) in terms of performance (spectral efficiency and latency match or exceed the standards mentioned above).  The 3G/2G/2.5G/2.75G is not very technical anyway.  —Preceding unsigned comment added by Lesswire (talk • contribs) 22:13, 23 March 2008 (UTC)

CDMA2000 cdma vs tdma vs fdma
"CDMA permits many simultaneous transmitters on the same frequency channel, unlike TDMA (time division multiple access), used in GSM and D-AMPS, and FDMA, used in AMPS ("analog" cellular)."

Consider revising. tdma does allow simultaneous "conversations" on one frequency but they are technically not transmitting at the same time. What defines many?

"Since more phones can be served by fewer cell sites, CDMA-based standards have a significant economic advantage over TDMA- or FDMA-based standards."

it is unclear why more phones can be served with cdma —Preceding unsigned comment added by Jakedoy (talk • contribs) 23:18, 27 October 2007 (UTC)


 * cdma has higher spectral efficiency in terms of bits/sec/Hz, hence the voice capacity is higher in cdma compared to GSM. —Preceding unsigned comment added by Lesswire (talk • contribs) 22:15, 23 March 2008 (UTC)

References are needed
References are needed. You cannot write one of these without them. --KJRehberg (talk) 05:11, 17 January 2008 (UTC)

Working on this
I'm going to work on this page for the next few days, hopefully have a big update at some point next week. I might even put in citations. --Mblumber (talk) 03:56, 18 January 2008 (UTC)

Intro too technical
The introduction on this article is way too technical and the list of different standards doesn't mean anything if they're not in context. The list should be moved to the article and just about every sentence after the first one should have a non-technical explanation of what it is. Also the acronyms are excessive for an introduction, even if it is a technical subject the reader should be able to look up the page and understand what the main concept is from just the intro.

This sentence should probably be moved down to history.
 * "In the United States, CDMA2000 is a registered trademark of the Telecommunications Industry Association (TIA-USA).[3]"

All of these acronyms are meaningless, you shouldn't have to look up all of the other stuff just get an introduction into what the article is about.
 * "The successor to CDMA2000 is LTE, part of the competing 3GPP family.[4]"

Does anyone agree? Epididymus (talk) 02:43, 24 February 2011 (UTC)

i think people generally agree. — Preceding unsigned comment added by 67.151.51.83 (talk) 14:46, 15 July 2013 (UTC)

CDMA Band Classes?
Is the lack of a listing of the band classes due to copyright? — Preceding unsigned comment added by Caspar347 (talk • contribs) 13:27, 12 March 2014 (UTC)