Oh, and you have to perfectly control all customers so that they never attempt to use more resources than the system has available. What people don't realize is that this kind of perfection is not even realized on wireline networks. Wireline networks suffer from dropped and blocked calls, and always have. They have it it a lot less than a wireless network, but they do have it. And a wireless network has variables that would give a wireline network engineer nightmares.
Chaos theory applies here.
Weather, traffic, ball games letting out, earthquakes. Hey, in our Seattle network, for the hour after the recent earthquake, the call volume went from an average of 50,000 calls to over 600,000. You see, it's not just about the air interface. It's not just about the hardware. . .