100 megahertz below the frequency of 6000 megahertz shall be identified for use on an exclusive, licensed basis for commercial mobile use, pursuant to the Commission’s authority to implement such licensing in a flexible manner, and subject to potential continued use of such spectrum by incumbent Federal entities in designated geographic areas indefinitely or for such length of time stipulated in transition plans approved by the Technical Panel under
section 923(h) of this title for those incumbent entities to be relocated to alternate spectrum; and