Cloud-based system for distributed hierarchical databases

An apparatus comprising:

• at least one processor;
• and
• at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform at least the following:
• receive, by the apparatus and from a cloud node, a service request to allocate a portion of a shared spectrum;
• synchronize, by the apparatus, local spectrum information collected by a sensor at the apparatus with remote spectrum information at a central shared spectrum access database to form synchronized spectrum information, wherein the local spectrum information and the remote spectrum information include radar information and possible interferer information, and wherein the radar information includes at least one of a physical location of a radar, a location of the radar main beam, a frequency of a radar, or a rotation pattern of the radar;
• determine, by the apparatus and in response to the service request, whether to allocate, to the cloud node, a portion of the shared spectrum, the determining based on the synchronized spectrum information;
• and
• send, by the apparatus and in response to the determining, a command to the cloud node to indicate an allowance to use the portion of the shared spectrum or to inhibit a use of the portion of the shared spectrum by at least a radar and a wireless user equipment.