There is provided a method, comprising: communicating a first data session on a first network slice with a source network node; receiving an indication indicating whether or not mapping the first data session to a second data session at a target network node requires switching to a second network slice, wherein the user equipment is equipped with a dual active protocol stack enabling the user equipment to communicate with the source network node and with the target network node during the handover process of the apparatus from a source cell provided by the source network node to a target cell provided by the target network node; deciding to continue the first data session on the first network slice with the source network node during the handover process; and deciding, based on the indication, when to start user plane data communication on the second data session with the target network node.