In one embodiment, a method implemented in a virtual network function (VNF) manager for delivering of services to a roaming UE is disclosed. The method includes identifying a trigger condition for handing-over delivery of at least a subset of services from a radio interface of a source radio base station to a radio interface of a target radio base station. The method also includes transferring the subset of the services to the target radio base station through a route based on information from a software-defined networking (SDN) controller of a SDN system that includes the source radio base station and the target radio base station. The method further includes causing at least one VNF to be deployed on the target radio base station, the at least one VNF on the target radio base station being adapted to offer the subset of the services to the roaming UE.