A method in a network node (10, 11, 31) for use in a wireless communications system operating in time division duplex, TDD, mode, the method comprising: performing interference channel measurements to estimate at least one interference channel between a fixed communication node (10, 11) and a number of other fixed communication nodes (10,11); storing interference channel information on said at least one interference channel, wherein the interference channel information includes radio channel estimates derived from the interference channel measurements; pre-computing receive antenna weights, that based on the stored interference channel information, limit the fixed communication node's sensitivity to interference caused by transmissions from a number of different sets of the other fixed communication nodes; storing the pre-computed receive antenna weights in a database, such that pre-computed receive antenna weights associated with a selected one of the different sets of the other fixed communication nodes may be applied at a future point in time when the fixed communication node is to perform interference reduction with respect to the selected set of other fixed communication nodes and performing interference reduction between the fixed communication node and a set of the other fixed communication nodes when the fixed communication node is operating in uplink mode to receive an uplink signal from a desired transmitting node, wherein the interference reduction involves antenna weight selection for a plurality of antenna elements of the fixed communication node and applying receive antenna weights, that based on the stored interference channel information, are selected to limit the fixed communication node's sensitivity to interference caused by transmissions from the set of other fixed communication nodes. performing interference channel measurements to estimate at least one interference channel between a fixed communication node (10, 11) and a number of other fixed communication nodes (10,11); storing interference channel information on said at least one interference channel, wherein the interference channel information includes radio channel estimates derived from the interference channel measurements; pre-computing receive antenna weights, that based on the stored interference channel information, limit the fixed communication node's sensitivity to interference caused by transmissions from a number of different sets of the other fixed communication nodes; storing the pre-computed receive antenna weights in a database, such that pre-computed receive antenna weights associated with a selected one of the different sets of the other fixed communication nodes may be applied at a future point in time when the fixed communication node is to perform interference reduction with respect to the selected set of other fixed communication nodes and performing interference reduction between the fixed communication node and a set of the other fixed communication nodes when the fixed communication node is operating in uplink mode to receive an uplink signal from a desired transmitting node, wherein the interference reduction involves antenna weight selection for a plurality of antenna elements of the fixed communication node and applying receive antenna weights, that based on the stored interference channel information, are selected to limit the fixed communication node's sensitivity to interference caused by transmissions from the set of other fixed communication nodes.