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> And forcing all cell phones of every design every where to have GPS.

Cell phones need some kind of accurate-enough (GPS is arguably overkill) self-locating ability, because the encryption properties of the modulation make passive transmitter location and ranging determination difficult: they need to know when to switch between cell towers (ENodeB).

Wiener functions are cool, and the RADAR applications were top secret during WW II.

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I don't know of any strategy that uses GPS location to decide when to switch between towers. A tower could be offline for maintenance. You're probably going to want to use the signal strength from the tower as the strongest indicator of switching.

Aside from that ENodeB uses GPS for timing. At the base station. In a way that does not require your phone to _also_ have GPS.

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