AT&T filed the paperwork with the FCC for an experimental license to conduct fixed and mobile tests using various gear in the 3.5 GHz band at several sites in the Redmond, Washington, area.

The operator explained that the testing and expected experimental equipment would support potential fixed wireless applications, including video and data transmissions. The application calls for 10 experimental units to be used from multiple manufacturers but doesn’t name the suppliers.

AT&T would like to start the experimental operations on Dec. 15, with an end date of June 14, 2019.

That AT&T is conducting more 3.5 GHz tests isn’t surprising given that it has said it plans to start testing Citizens Broadband Radio Service equipment in its own labs early next year and expects to roll out commercial CBRS technology in U.S. cities starting in late 2019. AT&T announced in September that it would be using gear from Samsung and Spectrum Access Sharing administration services from CommScope.