There is disclosed a method in a first network node operating in a split bearer environment, the first network node being communicatively connected with a second network node via an internode interface. The method comprises obtaining, by the first network node, expected queuing times of packet data convergence protocol (PDCP) packet data units (PDUs) at the first network node and at the second network node. The method comprises determining, by the first network node and according to the estimated expected queuing times, forwarding of a flow of PDCP PDUs destined for a User Equipment (UE).