System and techniques for radio spectrum sharing are described herein. A free radio spectrum block may be identified. An identification packet of the free radio spectrum block may be published. Here, the identification packet may include at least one of available spectrum, time, or area corresponding to the free radio spectrum block. An acknowledgement to the identification packet may be received. A provider of the free radio spectrum block may then be caused to cease radio communication on the available spectrum for the time and area specified in the identification packet.