So, finally you agree CDMAOne is first of several air interfaces where loading and interference diminishes coverage? I commend you on your unusually lucid attempt to explain away what I believe are serious flaws in your assertions.
1900mhz GSM with its smaller coverage only exists to free up existing 900mhz capacity in metro areas. 900mhz capacity constraints force providers to license 1900mhz spectrum, increase site density and deploy E1 lines linking base station transceivers together. It was the cheapest method they had at their disposal that allowed inexpensive dual-band handset design. But, increased base station density was still expensive to deploy.
AMPS certainly faces the same site placement challenges of TDD standards. Now, lets compare apples to apples. IS95/Amps providers have been able to move customers to IS95 and migrate their FM channels to CDMA as warranted. No new spectrum. Now, I am not going to claim 800CDMA has the exact same coverage as 800AMPS. But, they are offering 7 cents a minute calls with free long distance. Since Verizon doesn't have Class Action lawsuits filed against it like AT&T over blocked and dropped calls, I think its safe to assume cell coverage variations has been rendered moot.
European customers will rely on GSM and GPRS roaming on 3G calls until base station density fills in the gaps at 2.1ghz for UMTS. With EDGE trapped in development, GPRS suffering from data rates hovering above and below the 14.4kb of IS95A, your hard handoff challenge between bands and standards cannot give customers the same voice performance they have with a single-band 900mhz gsm phone..
What if the Isle of Mann was chosen so you can neglect to demonstrate TDD handoffs?
Cingular, Voicestream, and AT&T will be deploying living breathing cell coverage in the near future as well.
But, they will also have the challenge of hard handoffs between 3 bands and at least 3 different standards.
If all they have to roam on is GPRS between 3G cells, then US TDMA providers will be overshadowed by the combination of 1X and 1XEv about to be deployed by Verizon and Sprint.
Since us dumb old Americans are stumped by phones without a dedicated power button, I am confident uniform performance and coverage will be key.
Advantage: SprintPCS and Verizon. |
