Have a look at this: 5G NR Testbed 3.5 GHz Coverage Results
In this paper the coverageof 3.5 GHz is studied by means of a full-scale trial with a NRtestbed. With beamforming the increased propagation losses at 3.5GHz compared to 2.1 GHz can be compensated and the coveragewas demonstrated to be on par with 2.1 GHz LTE fixed antennacoverage both outdoor and indoor.
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