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To: Wyätt Gwyön who wrote (2215)	10/12/1999 8:58:00 AM
From: Clarksterh	Read Replies (2) \| Respond to of 13582

Mucho - Now, there has been speculation and perhaps news that ATT is going straight to EDGE (skipping GPRS). GP has said that this will be expensive and difficult. Is this (replacing 30KHz BS radios with 200KHz) the reason why? Yes, although it isn't just the move from 30KHz to 200KHZ. Its probably driven by the change in modulation scheme necessary to get more bits into the same hertz. How does that affect existing subscriber terminals, if at all? This is more like a migration than evolution (too many very basic things are changing at once) and thus backwards compatibility will probably require extra gear at the basestation. This is less true of CDMA's move which is equivalent to EDGE (e.g. HDR). Is there a CDMA overlay in the works that would be more cost-effective to implement? Do you mean from CDMAOne or from GSM? If the former then HDR is probably more cost effective since it just takes better advantage of the CDMAOne scheme (assuming the original hardware was build flexibly enough); it doesn't go to an entirely new scheme. If you mean from GSM, then overlaying GSM with CDMAOne is probably about as cost effective as overlaying with EDGE (although, given that CDMAOne wasn't designed with this in mind, and it hasn't been done on a large scale, there might be some large initial extra costs for CDMAOne). Both require a pretty large change in the RF interface. Right now, is Mobile IP a CDMA2000-only "thing"? Is there a reason why it is superior to GPRS-specific protocols, and should be adopted by carriers coming from a GPRS upgrade path? Also, are there any other salient differences between W-CDMA and CDMA2000 that we should be looking at? Don't know. Although I will have to learn aspects of GPRS for my job, I haven't gotten there yet... . Clark

To: Wyätt Gwyön who wrote (2215)	10/12/1999 9:48:00 AM
From: engineer	Read Replies (2) \| Respond to of 13582

MobileIP has nothing to do with EDGE. EDGE is USING mobile IP. EDGE is a RADIO Protocol and Mobile IP is a way of assigning IP addresses on the fly. Any radio protocol can use MobileIP. MobileIP is the way the net will work in the future. Alot like your phone number works today. You will be able to send and rec email to your IP once you register. Your phone will register once you have started it and notify the network that your IP is in a certain cell, then any info directed to your IP will find you by a router and be delivered. Today the IP works only after you have established a session and done a series of IP exchanges to get your info.