Improved techniques are provided for managing frequency channels in a shared spectrum available to a radio local access network device (RLAN) in a wireless network. A shared spectrum system may perform operations including retrieving a plurality of parameters for one or more high-priority users in the wireless network; computing, based on the retrieved parameters, a plurality of interference-to-noise power ratio (I/N) contour values; storing the plurality of I/N contour values in a database; receiving, from the RLAN in the wireless network, a request for channel availability, wherein the received request includes at least a first value; extracting, based on the first value in the request for channel availability, I/N contour values from the database exceeding a threshold value; determining, based on the extracted I/N contour values, available frequency information corresponding to the received request for channel availability; and transmitting a channel availability response comprising the available frequency information.