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To: waitwatchwander who wrote (330)	12/17/2006 2:51:23 PM
From: Eric L	Read Replies (1) \| Respond to of 356

A Good Siemens TD-SCDMA whitepaper (March 2002) ... t3gt.com << It is unfortunate that it's containing everything including the kitchen sink has delayed it's coming forth. >> The primary reasons for the delay ... * Development of the primary access mode of UMTS (UTRA FDD) was prioritized over the secondary mode (UTRA TDD) so the initial 3GPP release (R'99) focused on UTRA FDD (WCDMA) and UTRA TDD (TD-CDMA and TD-SCDMA) were moved out to R'4. * UTRA TDD needed to harmonize TD-CDMA and TD-SCDMA, and essentially two harmonized variants of a single mode were created -- UTRA TDD HCR (TD-CDMA) and UTRA TDD LCR, and those needed to be harmonized with UTRA FDD (WCDMA). << It is unfortunate that it's containing everything including the kitchen sink >> As far as kitchen sink RTT's go, 3GPP2's UMB (cdma2000 EV- DO Revision C) has to take the cake. UMB is an evolutionary upgrade within the family of CDMA2000 standards that can be deployed in existing or new spectrum allocations using scalable bandwidths up to 20 MHz. UMB enhances the performance and capabilities of CDMA2000 by combining the best aspects of the following leading air interface techniques; CDMA, TDM, OFDM, and OFDMA. UMB also incorporates Multiple Input Multiple Output (MIMO) and Space Division Multiple Access (SDMA) << Kind of like landing a man on the moon ... One small step by half a dozen companies and one giant leap for the industry. >> At the 3GPP2 meeting in Montreal this month, the working group that was chartered by Technical Specification Group C (TSG-C) reached an agreement on defining a common framework for Frequency Division Duplexing (FDD) operations based on the evaluation and harmonization of various air interface proposals that were submitted to the 3GPP2. This common framework agreement was based upon a consolidated framework proposal submitted by China Unicom, Huawei Technologies, KDDI, LG Electronics, Lucent Technologies, Motorola, Nortel, QUALCOMM Incorporated, RITT, Samsung Electronics, and ZTE Corporation. Looks like 3GPP still doesn't have a TDD solution. Meet Clyde, the White Reindeer [click link then click play after a slow download] thecompassgroup.biz Best, - Eric -

To: waitwatchwander who wrote (330)	12/18/2006 10:48:16 AM
From: Eric L	Read Replies (1) \| Respond to of 356

Another typo ... You asked ... If it [TS-SCDMA] 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? In my prior post here I rsponded ... Because it (TD-SCDMA] 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. That should, of course, read ... Because TD-SCDMA [UTRA TDD LCR] 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 paired spectrum -- i.e. traditional cellular spectrum which in China is 900 MHz for GSM and 850 MHz for CDMA. Sorry 'bout dat. - Eric -