Talk:UMTS - Knowledge

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Chinese market. Originally the aim was to not be redundant on foreign patents related to the UMTS standard, so the Chinese telecommunications industry developed TD-SCDMA in cooperation with Siemens as an alternative to TD-CDMA. TD-SCDMA was originally not part of the UMTS standard but was later added or included as an alternative air interface to TD-CDMA on the "TDD-side". Nevertheless development and commercial introduction of TD-SCDMA to the chinese market was delayed until 2009 (compared to the introduction of UMTS with W-CDMA and TD-CDMA in 2001 in Japan). In the end this resulted in the introduction of 3G technology to the chinese mobile market in three flavours UMTS-FDD with W-CDMA (3GPP-Standard), CDMA2000 with CDMA (3GPP2-Standard) and TD-SCDMA. Each of the three main chinese mobile operators adopted one of these.

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various stump articles and doubled content from different articles into this one which itself was not very well written as well and lacking a lot of citations and background information. This gave the intention to concentrate everything here to clean up content, removing false information with the aim to introduce a proper structuring. Actually there is also quite a bit of of content on networking infrastructure which actually belongs into article

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Let me go ahead: At first there was only TD-CDMA available for the TDD-part which was directly standardized within the UMTS standard from the start, but as mentioned above this technology failed. Further the Chinese government and telecommunications industry wanted to introduce a 3G technology on the

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available for the TDD channel access method, but this technology failed on the market as the FDD version gained much more recognition, spread, deployment and support which lead to the rapid evolution of this "part" of the UMTS telecommunication standard. In common language this resulted in UMTS-FDD

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of spectrum, each slice divided into 10 ms frames containing fifteen time slots (1500 per second). The time slots (TS) are allocated in fixed percentage for downlink and uplink. TD-CDMA is used to multiplex streams from or to multiple transceivers. Unlike W-CDMA, it does not need separate frequency

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This is what I came across with so far. I hope that this helps to understand and aids existing confusion. Please let me know if there are any further questions that are worth to be discussed. I also had the intention to clear things up regarding the UMTS topic and naming. This resulted in merging

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component on 1.6 MHz slices of spectrum, allowing deployment in even tighter frequency bands than TD-CDMA. It is standardized by the 3GPP and also referred to as "UTRA-TDD LCR" However, the main incentive for development of this Chinese-developed standard was avoiding or reducing the license fees

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might be used. UMTS-TDD is not directly compatible with UMTS-FDD: a device designed to use one standard cannot, unless specifically designed to, work on the other, because of the difference in air interface technologies and frequencies used. It is more formally as IMT-2000 CDMA-TDD or IMT 2000

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which calls TD-CDMA both a "channel access method" and an "air interface". I get the impression that there's more to an "air interface" than a "channel access method"; is that true and, if so, which of those is TD-CDMA? Is UTRA-TDD HCR the air interface, and TD-CDMA its channel access method?

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And what's the relationship between "UTRA-XXX" and "UMTS-XXX"? Does only the first of those refer to the air interface in the case of UTRA-FDD and the two air interfaces in the case of UTRA-TDD, with the latter being "the entire UMTS stack, with one of UTRA-XXX's air interfaces as the air

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which currently redirects to this article." Are you saying there should be separate "UTRA" and "UTRA (telecommunication)" articles? That seems a bit confusing; perhaps they'd need more descriptive titles. What would the distinction be between the two articles?

1138:. Thank you very much for opening this topic. I consider it being very important to adress this issue. Indeed this structuring and the definition of various terms is very confusing and has to be made clear. As far as I know so far the structure is as follows: 1373:

This article does not feel neutral - CDMA2000 and evdo was never going to go anywhere globally. In reality there was not much criticism of W-CDMA, at least I never heard anything. W-CDMA was original development and fairly different from what Qualcomm did.

893:(TDMA): the frequency band is divided into time slots (TDMA), which are further divided into channels using CDMA spreading codes. These air interfaces are classified as TDD, because time slots can be allocated to either uplink or downlink traffic. 1290: 1119:

interface"? Or are they just two names for the same thing? And do the "IMT CDMA XXX" and "IMT XXX" names refer to the entire UMTS stack with the corresponding air interface or just to the air interface?

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that have to be paid to non-Chinese patent owners. Unlike the other air interfaces, TD-SCDMA was not part of UMTS from the beginning but has been added in Release 4 of the specification.

1215:), which has not seen any deployment yet and is also very unlikely to see any in the near future because of missing device compatibility, as the standard extension arrived too late.) 1260:(and sometimes even W-CDMA) beeing referred to as "UMTS". From the technical side this naming scheme is false, but quite many people don't got to know this background information. 1295:

In your reply in "Names for various flavors of UMTS?", you say "Actually there is also quite a bit of of content on networking infrastructure which actually belongs into article

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So what is the relationship between "W-CDMA", "UMTS-FDD", "UTRA-FDD", and "IMT-2000 CDMA Direct Spread"? Do they all refer to the same thing? If not, which ones, if any,

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services, but can also carry data at high speeds, allowing mobile operators to deliver higher bandwidth applications including streaming and broadband Internet access.

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The term "TD-SCDMA" is misleading. While it suggests covering only a channel access method, it is actually the common name for the whole air interface specification.

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To me it would make sense to have the same structuring concerning content and redirecting for both technologies in the end. With a view on

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which currently redirects to this article. To gain a better overview on everything, I have taken action and introduced an article-matrix (

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there's a long discussion of various terms used in various of the articles that were merged into the air interfaces section.

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in UTRA-TDD HCR. UTRA-TDD HCR is closely related to W-CDMA, and provides the same types of channels where possible. UMTS's

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The two UMTS air interfaces (UTRAs) for UMTS-TDD are TD-CDMA and TD-SCDMA. Both air interfaces use a combination of two

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be the case with TD-CDMA? And is "UTRA TDD 1.28 mcps low chip rate" another name for the air interface?

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air interfaces, which would indicate that it's not a UTRA, it's a "something else" that has two UTRAs.

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So that's calling TD-SCDMA an air interface, not a channel access method. Is it both, unlike what

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on 2016-03-13. For the contribution history and old versions of the redirected page, please see

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