Home base station nodes (110) that support multi-carrier operation are disclosed. In some embodiments, two carrier signals are transmitted on different frequencies to one or more user devices that support multi-carrier operation, and different global cell identifiers are broadcast on the two carrier signals. Control messages are sent and received for both of the two carrier signals over a single control-plane interface between the home base station (110) and either a core network node (170) or a home base station gateway (120).