A femtocell base station in a telecommunications network identifies, for each user device served by the base station, which other base stations in the network that user device is authorized to access. The base station also determines a group identity for each of a plurality of possible neighbor cell base stations in the network. Based on this information, the base station identifies at least one possible handover target cell base station for each user device served by the base station, based on the identified other base stations in the network that user device is authorized to access; and based on the identified group identity for each of a plurality of possible neighbor cell base stations in the network.