Patent Document ID: 9800353
Application ID: 14241309
Patent Flag: 1

Claim One:
1. A method performed by a node, for controlling an aggregated interference generated by at least two white space units in at least one point in space for at least one frequency channel, wherein a model of propagation channels from each of the at least two white space units to each of the at least one point comprises a variable with a lognormal distribution, the method comprising: receiving requests for usage of white space frequency channels from the at least two white space units, the requests comprising positions of the at least two white space units, determining output power limits for the at least two white space units by maximizing a utility function while fulfilling a probabilistic constraint on the amount of aggregated interference generated in each of the at least one point, based on the received requests and on said model of propagation channels, wherein a sum of lognormal variables in the probabilistic constraint is approximated by a single lognormal variable, the probabilistic constraint corresponding to a probability that the aggregated interference from the at least two white space units does not exceed an interference value threshold, wherein the probability is constrained to be below a probability threshold at each of the at least one points, wherein determining the output power limits further comprises: determining that the output power limit for each of the at least two white space units is equal to or lower than a maximum output power value available for the respective one of the at least two white space units; transmitting the determined output power limits to the respective at least two white space units, and wherein the at least two white space units are requesting simultaneous usage of at least two frequency channels, and wherein determining of output power limits is subject to a constraint on a total transmit power for each of the at least two white space units over all selected frequency channels including the at least two frequency channels.