If a smart city will truly be that, it needs a network to allow data transfer, mobile use opens up a few problems, this small video opens up the subject and explains some of the problems and fix's
But city to city communication is equally as important, so in this video the author looks at the Global internet
Fixed fiber has its benefits, speed and dencity of signal in a fibre optic cable, but in areas where there is no cable or the cable fails, earhtquakes and the like, this ballon connectivity offer so much.