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To: JGoren who wrote (17178)	10/26/1998 10:14:00 AM
From: freak.monster1	Respond to of 152472

>Is there any technical superiority of cdma over GSM-TDMA for WLL? I know little about GSM, but my conjecture is that CDMA is better for WLL for the following reasons: 1. Higher capacity 2. Ability to benefit more from the different channel condition. 3. With IS-95HDR, to offer ASDL like data rates bandwidth efficiently (I know EDGE is being talked about for GSM, but I don't know enough to comment) while overcoming the "last mile" problem. In summary, it would be better because of higher voice and data capacity. Welcome additional comments on this.

To: JGoren who wrote (17178)	10/26/1998 10:49:00 AM
From: Clarksterh	Respond to of 152472

JG - Is there any technical superiority of cdma over GSM-TDMA for WLL? As I mentioned in passing earlier, CDMA gets the extra capacity for WLL for free (without any changes in software or air interface). In order to get any of the benefits of WLL vs mobile, TDMA systems would need to make changes (like better frequency reuse between cells). I don't know exactly how hard this would be, but it is certainly not free. And there is the quote from the Economic Report: Fixed Wireless Networks sent to me by Qualcomm with the specs: "In mobile networks, CDMA capacity is usually 3 or 4 times greater than D-AMPS for a single site. When the users are fixed in a network, the capacity of CDMA is typically 6 or 7 times greater than D-AMPS for a single cell site. The cell capacity increases because fixed subscribers create a lower level of interference and a more stable power control environment than mobile users, allowing a greater number of users to coexist within a single RF carrier for CDMA WLL. In a mobile CDMA network from Qualcomm, 24 calls per sector per carrier are possible. In a fixed network, the capacity increases to 45 users per sector per carrier." Although DAMPS is not the same as GSM, they do use the same basic technology -TDMA. Given this quote plus my original thinking I am actually much more confident of the fact that CDMA has an extra advantage over TDMA in WLL than I am over the CDMA/TDMA advantage in a full mobile system. (The only strong, relatively unbiased, evidence I've seen for the latter is the data Gregg referred to - the cost per user for the different kinds of networks.) Hope this answers your question. Clark