Patent ID: 8644870

Claim:
A method in a communication node of a wireless communications system providing at least two communication links each having at least two frequency channels, wherein the communication node is configured to communicate with a receiving communication node over a link under influence of interference from surrounding transmitter(s) using said frequency channels, the method comprises the steps of: determining a target for said link for the sum of the data rates; and allocating power on the frequency channels to reach said target while minimizing the sum of the power on said link; wherein the updated power to be allocated on one link, u, for a frequency channel is calculated by using waterfilling allocation provided a predefined Lagrange parameter λ u (m+1) , where u represents the link and m the iteration, and wherein an updated Lagrange parameter to be used for calculating the updated power to be allocated for link u, λ u (m+1) , is λ u ( m + 1 ) = λ u ( m ) · 2 R u ( m ) - R u Target N u ( m ) , wherein R u (m) represents the data rate on link u at iteration m, R u Target is said target, and N u (m) is the number of frequency channels for which the sender use non-zero transmit power in iteration m.