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Technology Stocks : Qualcomm Incorporated (QCOM)

QCOM 173.96

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Nov 11 3:59 PM EST

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To: Bux who wrote (20252)	12/22/1998 12:57:00 PM
From: Ramus	Read Replies (2) of 152472

Bux, W-CDMA is a kind of hybrid system. It has CDMA and TDMA modes. The latter so that there will be some kind of backward compatibility with TDMA based 2G standards. From the ARIB proposal: <6.3.1.2 Dual-mode Terminals for 2G and 3G Systems The proposed RTT was designed taking into account the feasibility of dual-mode terminals with typical second-generation systems, e.g., PDC, GSM and IS-95. Systems based on the proposed RTT can support most services provided by second-generation systems, in addition to IMT-2000 services.> You have to be careful with the verbiage here. The standard is not necessarily directly useable with PDC and certainly not with IS-95 but can share some resources with GSM as Clark has pointed out. What they really mean to say is that they could share spectrum with these. An operator would still have to have hardware to support PDC, GSM or IS-95. For W-CDMA proponents: The TDMA mode is compatible with GSM in a timesharing sense. The method of modulation for instance is QPSK not MSK so W-CDMA in no way represents a directly compatible air interface for GSM. The compatibility is only in timesharing and certain other timing related issues. I might add that this is far different from IS-95 and CDMA-2000 compatibility. Where IS-95 protocol is a subset of 1XRTT in 3G and will integrate very smoothly with it. Afterall, it's CDMA to CDMA, not TDMA to CDMA. I know, you think that W-CDMA must be superior to CDMA-2000 in overlaying a GSM system. Sorry but not true. As I said W-CDMA proposes using a 1/2 capacity TDMA mode to overlay GSM systems. IS-95 has demonstrated overlay of GSM systems and the economics involved. This overlay would be a much more economically viable upgrade path for GSM operators looking to move up to 3G services. As Perry LaForge pointed out, we should see movement on this in Europe once the spectrum allocations are finished. Walt

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