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MIPI Alliance offers new specs for RF control

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mbarnett
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re: MIPI Alliance offers new specs for RF control
mbarnett   1/18/2012 9:31:09 PM
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Per Dr. Dietmar Wenzel, chair of the DigRF Working Group, DigRF v4 is not limited to 2G and 3G. It also supports the requirements of today’s LTE implementations and is prepared to support the requirements of future LTE-A/4G systems as well. DigRF v4 is a completely new generation of BBIC to RFIC interface compared to previous versions of DigRF, i.e. DigRF v1.12 for 2.5G and DigRF v3.09 for 2.5G/3.5G. DigRF v4 is very flexible and configurable. Of course, it can be used for other standards like CDMA, TD-SCDMA, etc. as well.

Bert22306
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re: MIPI Alliance offers new specs for RF control
Bert22306   1/18/2012 10:02:40 AM
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Was looking for a cool graphic that showed which countries supported what, but couldn't find it this time. Not sure about Australia, however it looks like 40 countries do provide so-called CDMA cellular, in addition to GSM, but none of them are in Europe. Also, I meant 3G in my previous, not 34G. That was fat finger typing, not that I returned from the distant future.

Bert22306
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re: MIPI Alliance offers new specs for RF control
Bert22306   1/18/2012 9:42:17 AM
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I made two points that I think are factual: (1) that this DigRF only addresses the GSM 2G and 34G radio interfaces (and further checking proved this to be the case), and (2) that Europe only supports GSM. Both are true. In the US, you have been able to use GSM for many years now, all over. But in addition to that, there's also a widespread other standard, commonly but ambiguously referred to as CDMA. And other standards that have since fallen by the wayside. Other countries also support this so-called CDMA standard, along with GSM, (Russia, Korea, Australia, and others), but not Europe. In Europe, it's GSM only. Parenthetically, the reason I object to "CDMA vs GSM" is that this differentiation at best applied during 2G days, where GSM still used TDMA for the radio link. With 3G, everyone went to wideband CDMA, even though the GSM variant is slightly different, and incompatible with, the Qualcomm design.

jackOfManyTrades
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re: MIPI Alliance offers new specs for RF control
jackOfManyTrades   1/18/2012 7:20:12 AM
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A very strange comment, Bert. A year or so into my career, I remember reading that you could use a GSM phone in 70 different countries, but couldn't use a single phone all 50 US states. Hardly an "island of nothing". I was a member of the standardisation committee of an earlier version of this standard. I shall never forget the session (in 2005, I think) where we were talking about the width of a PCB track and a US member said something like "5 or 6 mils" and all us Europeans said "what - 5 or 6mm?". It turned out the US member meant thousandths of an INCH!

Bert22306
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CEO
re: MIPI Alliance offers new specs for RF control
Bert22306   1/17/2012 9:09:46 PM
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I can't tell if this is truly an all-encompassing standard, as it sounds like on the surface, or whether they are deliberately leaving out the CDMA, cdma2000, and EV-DO variants of 2.5G and 3.5G. It seems odd to me that Europe continues to be an island of nothing outside of the GPRS/EDGE and the ITU variant of WCDMA, respectively for 2.5G and 3G +. I can't tell if DigRF is also that way, or if it's just the way the various options are being identified in these articles.

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