T-Mobile's success in reusing spectrum through a process called massive MIMO, which stands for multi-input multi-out, triggered sky-high demand for C-band spectrum. T-Mobile tested massive MIMO by sending two streams of data to eight 5G devices at the same time.

The U.S. Federal Communication Commission’s C-band auction of 280-megahertz of C-band has raised nearly $81 billion and it’s not quite over.

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Debra Werner is a correspondent for SpaceNews based in San Francisco. Debra earned a bachelor’s degree in communications from the University of California, Berkeley, and a master’s degree in Journalism from Northwestern University. She is a recipient...