Google is not the only big company testing shared spectrum in the 3.5 GHz Citizens Broadband Radio Service, which supports up to 150 MHz of communications spectrum.
AT&T plans its own tests using non line of sight radios.
Incumbent Access (IA) users are federal government users which include the U.S. Navy (shipborne littoral radars), Department of Defense and military bases (ground-based radars), Air Force and Navy Tactical (airborne radars), and non-federal users (Fixed Satellite Service [FSS] earth stations).
These users would have priority access to spectrum and all other users are bound not to interfere with their operations.
Exclusion zones will be defined to protect IA users. In the original studies which assumed macro cell deployments resulted in very large exclusion zones that cover the eastern and western seaboards and along the Gulf of Mexico with a total 60% of the population.
This was in large part to shipborne littoral radars of different power types which require exclusion up to 570 miles inland for the highest powered radar in some location where the land is flat and unobstructed.
With the focus now being on small cells, interference profiles are being reconsidered and new exclusion zones will be defined.
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