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Diference betwen 3G and UMTS |
alfuen_00
Joined: Jul 29, 2003
Posts: 19
PM |
here in mexico we had two diferent kind of services, one was a 1900 TDMA service provider that now works with the GSM network, i hear that the evolution of the TDMA was the GSM network so they migrate trought the TDMA to GSM using the same 1900bandwith and i hear that the GSM is kinda the 2.5 generation of phones, but now an old porvider that had a CDMA service migrates to a 3G servive, i hear that this is only the 3G generation of the CDMA technologie and the real 3G that the people uses in europe and japan for videoconference and that kind of things that the z1010 and nec phones do are the UMTS (the evolution of the GSM network), im kinda confused, DoCoMo japan is a service provider or a UMTS thing, hehe a lot of terms and i still in the shadows, well if someone could help me i will be very happy the service providers that i told u are TELCEL and IUSACELL the first one with 15years providing mobilephones services, the biggest company of its class in latinamerica and using GSM at 1900 band (http://www.telcel.com/gsm/equipos/equipo_menu.htm?) | |
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kr4nc
Joined: Jul 17, 2004
Posts: 263
PM |
3generation phones are using UMTS connection. I have t230, its 2.5 generation phone and has GPRS connection.dont know if im right
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themarques
Joined: Jan 26, 2003
Posts: > 500
From: London, Tokyo,
PM |
TDMA is a whole lot different system from CDMA.
TDMA is rather similar to GSM.
CDMA is called code-division multiple access
It is different from GSM and TDMA, which resembles GSM networks.
CDMA digitalizes the data and then extends it to every frequency available for the phone. As the communications are overlapped with a single channel, each communications are given certain digital codes to each of them to distinguish each other. Developed from Qualcomm, CDMA was first nation-widely commercialized in Korea. Nowadays about 1/3 of the cell phone users are using CDMA networks and about 20 countries use this. Major countries are South Korea/USA/Japan
Hoever, TDMA is kinda disappearing network technology. It is called time division multiple access. TDMA is used by Digital American Mobile phone service, GSM and Personal Digital Cellular. But these are developed so that they don't have compatibility between each different networks. (PDC in japan doesn't work in Europe for this reason) As a substitute, CDMA is developed. |
HjJ
Joined: Jul 02, 2004
Posts: 185
PM |
1G was analogue mobile phones, well-known systems are AMPS, ETACS and NMT.
2G is the first digital version of mobile phones. GSM is one standard for 2G, used in Europe and many other parts of the world. It is the most widely used 2G-standard in the world. In the USA and other countries, other 2G standards are also used.
TDMA and CDMA are two different radio-access technologies used to enable several simultaneous communications to share the same frequency band. GSM uses the TDMA technology. CDMA technology is widely used for 2G in the USA.
"2.5G" is used to denote various enhancements to 2G, notably higher transfer rates. GPRS and EDGE are 2.5G-enhancements to GSM. Non-GSM operators in the USA, Japan, South Korea, name their 2.5G-enhancements differently
3G is the third generation of mobile phone services. UMTS is one standard for 3G, and it will probably be used by most of the operators that currently use GSM. South Korea, Japan, China and USA also have other standards for 3G. The main difference between 2G and 3G is the much higher data transfer speeds on 3G, enabling such services as video-streaming and video calls.
UMTS specifies a radio technology called W-CDMA (Wide-band CDMA or something). Other 3G standards may use other forms of W-CDMA.
Most UMTS handsets will also support GSM.
You can get GSM for the 850, 900, 1800 and 1900MHz bands.
The mobile phone market in the USA is a complete mess, with each operator using its own standard. In Europe and other countries where GSM is mandatory, customers can freely switch operators and keep their handsets and telephone numbers.
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alfuen_00
Joined: Jul 29, 2003
Posts: 19
PM |
yeah that's what happend here, telcel moves to GSM using their actual tdma infraestucture, i tought they upgrade it, and now we had the most widely variety of 1900band phones most of them triband ones, and i mean tons, we had a new service provider that offers the same bandwith Movistar (from spain and one of the biggest european companies), and the other ones that used to had CDMA phones now offers 3G services, well as i tought the only 3g is the UMTS but maybe their lying or just trying to make the people moves to their companies, the one that is saying they use 3g offers horrible phones as the kyocera slider the lg mx 6000 and other one that sucks |
shyam335
Joined: May 25, 2004
Posts: > 500
From: 127.0.0.1
PM |
But utms or imt 2000 was supposed to be a single standard under which 3g was to be made?
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Posted: 2004-07-19 11:24
