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To: quidditch who wrote (29509)	5/11/1999 7:29:00 PM
From: Clarksterh	Read Replies (1) \| Respond to of 152472

Steven - I forgot about your Part I post - To articulate my question re. "TDMA survives" more precisely, if W-CDMA involves simultaneous TD and CD to maintain compatibility with legacy GSM (TD?) mode, and base station is "processing" signals on TD mode, where is the functionality of CD in this context, or is the air interface CD but TD remnant of system is at another layer of system operation (realize my question is lacking in tech specific lingo)? The primary reason for using TD in the 3g systems (including CDMA-2000) is to allow for more flexible frequency planning. For example, I had a customer whose country had one frequency block available. This ruled out all non-TD systems due to the fact that systems where the forward and reverse links are being transmitted simultaneously need to have the links separated by fairly large frequencies to avoid interfering with one another. As for CD, it still performs the same function as in CDMAOne. It allows multiple users to send at the same time or receive at the same time - just not one user to TX and another user (or more especially the same user) to RX at the same time. Clark