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Technology Stocks : Qualcomm Moderated Thread - please read rules before posting
QCOM 170.90-1.3%Nov 7 9:30 AM EST
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To: rkral who wrote (30835)1/7/2003 11:37:37 AM
From: Randall Knight  Read Replies (1) of 196546
 
I believe there is some confusion as to how 1xEV-DO operates and perhaps CDMA in general. The concept of one user "tying up" a channel is absurd. The example given where a user occupies a channel for a millisecond illustrates how TDMA works. In a CDMA system, multiple users are sending data simultaneously with each user having a code assigned. This is true whether the channel is allocated for voice or for data.

In 1xEV-DO, a 1.25 MHz channel is dedicated to data only. However, by definition, this channel is used by multiple users simultaneously. Given the high efficiency of how CDMA does data, particularly with EV-DO, this actually increases bandwidth. Remaining channels can then be dedicated to voice only using 1xRTT.

The comment that one user would have 100% of a channel's capacity if no one else were using it is a bit of stretch. Why would such a system be built if demand were so low? In reality, EV-DO delivers high data rates on a loaded channel. I don't know what number of users constitutes "loaded."

Also, I believe the channels can be dynamically assigned as demand increases.

I'm not a tech type but I'm sure there are those here who will correct me if I'm wrong.
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