FIELD: radio engineering, communication.
SUBSTANCE: invention relates to a wireless network node and a corresponding method of controlling interference generated by at least one free window device controlled by the network node. The method comprises transmitting (520) an information request relative to channels available for secondary use to a remote object and receiving (530) information from the remote object, wherein said information indicates a channel available for secondary use, a critical position associated with said channel, and an interference threshold for the critical position. The method also comprises obtaining (540) a restriction for assigning said channel to at least one free window device based on the position of at least one free window device, the critical position and interference threshold and assigning (550) said channel and transmission power to at least one free window device based on the obtained restriction, through which interference generated in the critical position by at least one free window device is maintained below the interference threshold.
EFFECT: enabling a network node to maximise secondary use for WSD and concurrently control interference generated in critical positions of the primary system.
22 cl, 7 dwg
