From The Technology Liberation Front:

As Joe Kane explained in a white paper, the FCC and telecom companies are exploring various ways of accomplishing that.

Prof. Dan Lyons and Roslyn Layton wrote in support of the secondary market plan on the AEI blog and at Forbes, respectively. Joe Kane also favors the approach. As they say, the benefit of secondary market sales is that it will likely lead a significant and fast repurposing of the C Band for mobile use.