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Technology Stocks : Qualcomm Moderated Thread - please read rules before posting
QCOM 177.78-2.2%Jan 9 9:30 AM EST
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To: cfoe who wrote (28858)11/13/2002 12:42:45 PM
From: RalphCramden   of 197155
 
UMTS has in its standard definition the ability to build for synchronous handoff. It just isn't REQUIRED by the standard.

The base stations (called "node b"s I think) have different levels of synchronicity defined. And then the mobiles can take advantage of knowing how well BSs are synchronized to narrow their search space to allow handoffs to occur more readily and quickly.

The real issue is whether the infrastructure providers and the service providers who are their customers decide to use this synchronizing ability. They might as well, they have already all bought the licenses from QCOM, so it would seem there is no reason NOT to use it.

Even with this synchronizing there are still lots of differences between CDMA2000 and WCDMA. Among others, WCDMA uses spectrum in chunks of ~4 MHz at a time, CDMA puts 3 channels @ 1.25 MHz each in that amount of spectrum. This changes the flexibility of channel allocation and deployment (in CDMA2000s favor IMHO). It changes the complexity and processing power required in a receiver (wider band channel means more fingers in the RAKE to get same signal combining performance).

Finally the back-end (non-air-interface) stuff in WCDMA and CDMA2000 will still be pretty different, although they are probably both pretty good standards in that regard, each able to get the various jobs done that people want them to do.

Ralph
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