In a communications spectrum shared by public safety users and commercial users, in the event of an emergency condition, commercial users are preempted and corresponding resources are reallocated to authorized public safety users. When the emergency condition subsides, the reallocated resources are again made available for commercial use. In an example configuration, resources and associated attributes including preemptability status are maintained in a Base Station Controller (BSC), Radio Network Controller (RNC), and/or Radio Resource Control (RRC) of a communications network.