Wireless networks are scrambling to feed the growing hunger for mobile data and downloads.
AT&T has a problem in Chicago. The city was one of the first to be upgraded to the wireless carrier’s next-generation LTE (long-term evolution) network, which packs more data into a radio signal and offers much faster download speeds. But independent tests published this month showed that AT&T downloads in Chicago are less than half the speed of those on Verizon’s LTE network there. The reason? A lack of radio spectrum. AT&T’s radio licenses allow it to use only a 10-megahertz chunk of the airwaves for its LTE network in Chicago, compared with the 20 megahertz it has in other cities