Patent ID: 8725076

Claim:
A method of sharing a frequency in an environment where an incumbent system exists, the method comprising using a radio access technology to perform operations including: obtaining information associated with a plurality of frequency sets with respect to a sub-frequency resource generated by dividing a target frequency resource assigned to the incumbent system, each of the frequency sets indicating a characteristic of a sub-frequency resource included in each of the frequency sets; in response to a change in state of at least one sub-frequency resource belonging to one of the frequency sets, assigning the at least one sub-frequency resource to at least one frequency sharing system discriminated from the incumbent system; and sharing the frequency sets based on the assigning; wherein the assigning is according to a state of a sub-frequency resource of the frequency sets and to an order that priorly assigns a spare sub-frequency resource for sole use by a single frequency sharing system, then assigns a sub-frequency resource for sharing by a plurality of frequency sharing systems based at least partly on determining that the plurality of frequency sharing systems use a same radio access technology, and then assigns a sub-frequency resource for sharing by a plurality of frequency sharing systems based at least partly on determining that the plurality of frequency sharing systems respectively use different radio access technologies.