how-to block ads
|
|
Share Topic
 |
 |
|
|
 wifi4milezBig Russ, 1918 to 2008. Rest in Peace
join:2004-08-07
New York, NY | reply to GSMUser
Re: Better for Promoting CDMA Abroad said by GSMUser :
LTE is not GSM. LTE is an IP-Based network infrastructure and doesn't share the same core network as current day CDMA or GSM networks.
I think people get confused because the GSM Association chose LTE as their upgrade standard of choice. People now associate LTE with GSM when it is anything but.
Not entirely. LTE is an evolution of UMTS, which is itself an evolution (and based on) GSM. So while LTE is a new standard, it is based on, and composed of, GSM standards.
--
с новым годом | |
| What part of LTE is GSM? UMTS uses a CDMA (WCDMA) air interface. GSM uses a TDMA core. Completely different regardless of what "path," any particular carrier chooses. | |
wifi4milezBig Russ, 1918 to 2008. Rest in Peace
join:2004-08-07
New York, NY | said by AllCingularUser :
What part of LTE is GSM? UMTS uses a CDMA (WCDMA) air interface. GSM uses a TDMA core. Completely different regardless of what "path," any particular carrier chooses.
Huh?? Do some proper research buddy. UMTS is the evolution of GSM, and is based on the standard. LTE is also the evolution of UMTS and GSM, and is likewise based on the standard. Yes, each evolution utilizes new technologies (such as W-CDMA), however that doesnt change their core design.
said by UMTS Technical Description :
UMTS, the 3G successor to GSM which utilizes the W-CDMA air interface and GSM infrastructures.
said by UMTS Technical Description :
UMTS combines the W-CDMA, TD-CDMA, or TD-SCDMA air interfaces, GSM's Mobile Application Part (MAP) core, and the GSM family of speech codecs. In the most popular cellular mobile telephone variant of UMTS, W-CDMA is currently used.
I could quote many more lines explaining this in detail, but I will let you read it yourself and get a leg up on things.
»en.wikipedia.org/wiki/Universal_···s_System
--
с новым годом | |
|
All you quoted proves that UMTS is CDMA based (on the airlink - WCDMA) like the other guys said. You didn't prove that LTE is a natural evolution of GSM.
Don't confuse GSM with WCDMA and WCDMA with LTE either.
Like the other poster said. LTE is IP-based (OFDM for the downlink). What part of GSM is IP-based?
There will be no simple software upgrade from UMTS/HSDPA sites. They will require completely new hardware. There is NO guarantee that calls that originate on the old 2G GSM network or the newer WCDMA network will soft handoff to any LTE technology.
With the stock market the way it is and the way AT&T moves as slow as molasses with their technology rollouts, I don't see them really rushing to roll LTE out either. I'm sure Vodafone and Verizon will market the technology much sooner.
"Natural progression," in this case implies that the greater majority of GSM operators that are part of the "Association," mutually agreed that they'd unanimously migrate to a new standard. From a cost perspective, the move to LTE made much more sense since it required less bandwidth to operate with while allowing the various telcos to stay within budget. This was clearly a pure politics and money based decision.
| |
wifi4milezBig Russ, 1918 to 2008. Rest in Peace
join:2004-08-07
New York, NY | said by Howard F :
All you quoted proves that UMTS is CDMA based (on the airlink - WCDMA) like the other guys said. You didn't prove that LTE is a natural evolution of GSM.
You missed the point as well. GSM evolved to EDGE, which then evolved to UMTS. HSPA is an extension/evolution of UMTS. LTE is the next evolution of all the prior services, again, based on the core GSM design. For your reading pleasure:
said by LTE Technical Description :
3GPP LTE (Long Term Evolution) is the name given to a project within the Third Generation Partnership Project to improve the UMTS mobile phone standard to cope with future requirements. Goals include improving efficiency, lowering costs, improving services, making use of new spectrum opportunities, and better integration with other open standards. The LTE project is not a standard, but it will result in the new evolved release 8 of the UMTS standard, including mostly or wholly extensions and modifications of the UMTS system
said by Howard F :
There will be no simple software upgrade from UMTS/HSDPA sites. They will require completely new hardware. There is NO guarantee that calls that originate on the old 2G GSM network or the newer WCDMA network will soft handoff to any LTE technology.
Again, you missed the point. UMTS wasnt a simple software upgrade from GSM/EDGE either! NEW equipment has been required at each major "jump" in technology. The same applies with LTE. This is nothing new, and has happened multiple times already. Simply because equipment upgrades are required, in no way precludes something from being evolutionary.
The full description, along with the evolutionary lineage (along the right hand side) can be found at the following link:
»en.wikipedia.org/wiki/3GPP_Long_···volution
Mobile communication standards
GSM / UMTS (3GPP) Family
--------------------------------------------------------------------------------
2G
GSM
GPRS
EDGE (EGPRS)
EDGE Evolution
HSCSD
3G
UMTS (3GSM)
HSPA
HSDPA
HSUPA
HSPA+
UMTS-TDD
TD-CDMA
TD-SCDMA
FOMA
Pre-4G
UMTS Revision 8
LTE
HSOPA (Super 3G)
--
с новым годом | |
patcat88
join:2002-04-05
Jamaica, NY
kudos:1 | reply to AllCingularUser
CDMA is a digital modulation scheme, involing vectors, walsh codes, and psudorandom numbers. Nothing more.
Qualcomm Corp, makes a product called "IS2000" also called "CDMA2000", it is an upgrade of "IS-95", also there is a product called "IS-856, aka "EVDO". These are protocols that use CDMA modulation/multiple access. CDMA is a digital modulation/encoding, nothing more. It doesn't allow for cellphone, phone calls, internet, or anything else, it only allows multiple users on 1 communication medium.
GSM family decided to use CDMA modulation since it was more efficient than TDMA used in GSM. Their product is called "WCDMA", WCDMA and CDMA2000 only share a digital mutiple access technology, nothing more.
Are you also going to say next that sim-less old ATT Wireless handsets, also called "TDMA" are the same thing as GSM handsets? | |
|
