| Author |
umts/wcdma difference |
govigov
Joined: Jul 30, 2004
Posts: > 500
From: Back home - Cochin
PM |
Tdma = Time Division Multiplex Access. Gsm = Global Standard for Mobiles. They are entirely diff technologies. Will you pls try google? You can get loads of info there. (I confess, i am a bit confused. I know the working of gsm and cdma, but tdma i am lost.) (And i am not at all good with my communication skills.)
This message was posted from a K500 |
|
|
OluYom
Joined: Oct 27, 2004
Posts: > 500
From: Nigeria
PM, WWW
|
Scots wrote: "GSM usesTDMA, which is a different technology." @govigov: That, and the contradicting post you did (plus my semi-ignorance) was the source of my confusion :)
This message was posted from a P800 |
govigov
Joined: Jul 30, 2004
Posts: > 500
From: Back home - Cochin
PM |
Scots is a senior member. He must be correct.
This message was posted from a K500 |
scotsboyuk
Joined: Jun 02, 2003
Posts: > 500
From: UK
PM, WWW
|
Quote:
|
On 2005-01-02 19:51:58, govigov wrote:
Scots is a senior member. He must be correct.
|
|
I hope you were being sarcastic! If not then your comment is absolute rot, senior member indeed! I'm nothing of the sort and please don't label me as such. I'm not a fan of such titles.
@all
Getting back on-topic; GSM used narrow band TDMA, this article should give you a good understanding of the technology.
"I may be drunk my dear woman, but in the morning I will be sober, and you will still be ugly." WSC |
brix25
Joined: Aug 20, 2003
Posts: > 500
From: Cape Town, South Africa
PM, WWW
|
@scotsboyuk... In way I feel vindicated because in a previous thread I said that GSM and TDMA were related.
This message was posted from a T68i |
scotsboyuk
Joined: Jun 02, 2003
Posts: > 500
From: UK
PM, WWW
|
@brix25
They are more than related, GSM uses TDMA to function.
"I may be drunk my dear woman, but in the morning I will be sober, and you will still be ugly." WSC |
OluYom
Joined: Oct 27, 2004
Posts: > 500
From: Nigeria
PM, WWW
|
Guess that settles the debate then :)
This message was posted from a P800 |
govigov
Joined: Jul 30, 2004
Posts: > 500
From: Back home - Cochin
PM |
@scots, nothing bad should be inferred. I said that because i had some doubts, you were clear on the topic. So you had to be correct.(hope you are not offended in any way) @all, what does the article say?
This message was posted from a K500 |
scotsboyuk
Joined: Jun 02, 2003
Posts: > 500
From: UK
PM, WWW
|
@govigov
I just can't stand all that bally nonsense about 'veterans' and 'senior members' etc, not my cup of tea. Everyone's opinion is equally valid regardless of the length of time they have been a member of Esato or the number of posts they have.
The article explains how GSM is based on narrow band TDMA.
"I may be drunk my dear woman, but in the morning I will be sober, and you will still be ugly." WSC |
govigov
Joined: Jul 30, 2004
Posts: > 500
From: Back home - Cochin
PM |
@scots, hmmm... But you are still a senior member to me :p ! @all, i meant if some one could quote the article.
This message was posted from a K500 |
OluYom
Joined: Oct 27, 2004
Posts: > 500
From: Nigeria
PM, WWW
|
Now I can see how a GSM network setting up 3G requires so much funds. Its actually setting up a different platform (WCDMA) from the existing (TDMA), not merely upgrading. @scots: I imagine that 3G sets belong to those cross-platform devices you inferred, since they (3G sets) can also utilize 2G networks under certain circumstances.
This message was posted from a P800 |
govigov
Joined: Jul 30, 2004
Posts: > 500
From: Back home - Cochin
PM |
@aya, will pls copy paste the article here.
This message was posted from a K500 |
scotsboyuk
Joined: Jun 02, 2003
Posts: > 500
From: UK
PM, WWW
|
@govigov
I shall take your comment as a compliment then, but I would rather you didn't call me that.
The article is from Howstuffworks.
Probably the most useful thing to know about the Global System for Mobile communications (GSM) is that it is an international standard. If you travel in Europe and many other parts of the world, GSM is the only type of cellular service available. Originally, the acronym GSM stood for Groupe Spécial Mobile, a group formed by the Conference of European Posts and Telegraphs (CEPT) in 1982 to research the merits of a European standard for mobile telecommunications. Commercial service using the GSM system did not actually start until 1991. Instead of using analog service, GSM was developed as a digital system using TDMA technology.
Using TDMA, a narrow band that is 30 kHz wide and 6.7 milliseconds long is split time-wise into three time slots. Narrow band means channels in the traditional sense. Each conversation gets the radio for one-third of the time. This is possible because voice data that has been converted to digital information is compressed so that it takes up significantly less transmission space. Therefore, TDMA has three times the capacity of an analog system using the same number of channels.
TDMA splits a frequency into time slots.
TDMA is the access method used by GSM, as well as the Electronics Industry Alliance and the Telecommunications Industry Association for Interim Standard 54 (IS-54) and Interim Standard 136 (IS-136). GSM implements TDMA in a somewhat different and incompatible way from IS-136. Think of GSM and IS-136 as two different operating systems that work on the same processor, like Windows and Linux both working on an Intel Pentium III. GSM systems provide a number of useful features:
* Uses encryption to make phone calls more secure
* Data networking
* Group III facsimile services
* Short Message Service (SMS) for text messages and paging
* Call forwarding
* Caller ID
* Call waiting
* Multi-party conferencing
GSM operates in the 900 MHz band (890 MHz - 960 MHz) in Europe and Asia and in the 1900 MHz (sometimes referred to as 1.9 GHz) band in the United States. It is used in digital cellular and PCS-based systems. GSM is also the basis for Integrated Digital Enhanced Network (iDEN), a popular system introduced by Motorola and used by Nextel. The incredible growth of GSM is a big part of why the acronym is now commonly thought of as standing for the Global System for Mobile communications!
_________________
"I may be drunk my dear woman, but in the morning I will be sober, and you will still be ugly." WSC
[ This Message was edited by: scotsboyuk on 2005-01-02 20:12 ] |
govigov
Joined: Jul 30, 2004
Posts: > 500
From: Back home - Cochin
PM |
@scots. Yup thanks! Sure appreciate you a lot brother.
This message was posted from a K500 |
walaj
Joined: Jul 06, 2004
Posts: 11
From: UK
PM |
Quote:
|
On 2005-01-02 21:06:32, AYA wrote:
Now I can see how a GSM network setting up 3G requires so much funds. Its actually setting up a different platform (WCDMA) from the existing (TDMA), not merely upgrading. @scots: I imagine that 3G sets belong to those cross-platform devices you inferred, since they (3G sets) can also utilize 2G networks under certain circumstances.
|
|
however, UMTS actually only requires a new RADIO network - much of the "non-radio" part (known as the "Core") of a GSM network can be reused.
One of the reasons most commerical 3G networks have been so late, is because of the cross network functionality - in the handset. So (for example) the SE V800 is a dual mode handset as it supports both GSM and W-CDMA radio networks, and can handover between them (assuming this is supported by the network of course) |
|
|
Posted: 2005-01-02 19:42
