Method, network node, and computer program for downlink interference suppression in an access network

Abstract

There is provided techniques for downlink interference suppression in an access network. The method is performed by a network node. The method comprises estimating an uplink inter-cell interference covariance matrix for UEs not served by the network node from signals as received from the UEs on a first set of antenna ports and for a selected mapping from the first set of antenna ports to a second set of antenna ports upon which the inter-cell interference covariance matrix is formed. The method comprises performing downlink interference suppression by using a precoder. The precoder is determined as a function of the inter-cell interference covariance matrix whilst treating the inter-cell interference covariance matrix as having a block-diagonal structure, with L>1 blocks.

Dependencies are inferred from the claim text.