According to an aspect, a method comprises detecting a need to change a duplex mode in a first network node from half duplex to full duplex, determining relevant neighboring network nodes of the first network node, determining duplex pairing information of the first network node, wherein the duplex pairing information of the first network node comprises duplex information of the relevant neighboring network nodes, the duplex information comprising at least information on a current duplex mode of a corresponding neighboring network node, using the duplex pairing information to determine duplex modes of the relevant neighboring network nodes, if all the relevant neighboring network nodes operate in half duplex mode, causing changing the duplex mode of the first net-work node to full duplex; and in response to the causing changing the duplex mode, causing updating information on a current duplex mode of the first net-work node.