Siemens Message Board - Msg: 23111017

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Technology Stocks : Siemens

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To: waitwatchwander who wrote (332)	12/18/2006 10:14:27 AM
From: Eric L	of 356

The 2002 Siemens TD-SCDMA whitepaper ... NF, << Your white paper is not dated >> As noted in the prior post's header it is dated March 2002, at about the time 3GPP R'4 was completed (i.e. functionally frozen), and despite its age is still one of the best basic treatments of TD-SCDMA (UTRA TDD LCR) I've seen ... A Good Siemens TD-SCDMA whitepaper (March 2002) ... [See 'File \| Document Properties' in Adobe Reader] In R'5 & R'6 HSxPA is added to UTRA TDD LCR (TD-SCDMA) but I believe it requires aggregating 3 LCR carriers. The document you linked was written 2 years earlier than the paper I posted ... May 2000. I thought you might like to see something somewhat more current. I've been trying to keep my TD-SCDMA reading down to 4 or 5 page articles until I get a better handle on what it's all about. I guess I'm now ready for 40 pages. It's big type. <g> << I also noted that paper proposes TD-SCDMA as the better overlay solution for GSM constrained systems. If it is such a serious contender, why haven't we heard noise about this "better" solution instead of the use of w-cmda in 850 Mhz? >> Because it is a Time Division Duplex (TDD) solution. It was proposed but not chosen by ETSI as the primary access mode of UMTS for use in traditional cellular paired spectrum and an FDD version has never been standardized in 3GPP. WCDMA was chosen as the Frequency Division Duplex (FDD) solution -- the primary UMTS access mode for use in unpaired spectrum. << It is peculiar that you choose to compare TD-SCDMA with UWB. >> I didn't. I compared it to 3GPP2's and CDG's (QUALCOMM's) recently announced UMB (Ultra Mobile Broadband aka cdma200 EV-DO Revision C vaporware from the "kitchen sink" technology soup perspective ... More UMB detail here ... Message 23110954 I did make a typo in my prior post here ... I said: Looks like 3GPP still doesn't have a TDD solution. I meant to say ... Looks like 3GPP2 still doesn't have a TDD solution (for unpaired spectrum). Best, - Eric -

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