A base station comprising: providing means adapted to provide each of a first service and a second service to each of a first user and a second user, wherein the first service is at least one of a group communication service and a proximity service; mode monitoring means adapted to monitor if the providing means operates in an isolated mode or in a linked mode opposite to the isolated mode; and at least one of a service control means and a user control means, wherein the service control means comprises: a service inhibiting means adapted to inhibit, if the providing means operates in the isolated mode, the providing means from providing the second service to the first user and the second user, wherein a decision to operate in the isolated mode being responsive to detection of unavailability of a first link between a radio access network and a core network; and a service maintaining means adapted to prevent the service inhibiting means from inhibiting the providing means from providing the first service to at least one of the first user and the second user; and wherein the user control means comprises: a user inhibiting means adapted to inhibit, if the providing means operates in the isolated mode, the providing means from providing the first service and the second service to the second user, wherein the decision to operate in the isolated mode being responsive to detection of unavailability of the first link between a radio access network and a core network; and a user maintaining means adapted to prevent the user inhibiting means from inhibiting the providing means from providing at least one of the first service and the second service to the first user. providing means adapted to provide each of a first service and a second service to each of a first user and a second user, wherein the first service is at least one of a group communication service and a proximity service; mode monitoring means adapted to monitor if the providing means operates in an isolated mode or in a linked mode opposite to the isolated mode; and at least one of a service control means and a user control means, wherein the service control means comprises: a service inhibiting means adapted to inhibit, if the providing means operates in the isolated mode, the providing means from providing the second service to the first user and the second user, wherein a decision to operate in the isolated mode being responsive to detection of unavailability of a first link between a radio access network and a core network; and a service maintaining means adapted to prevent the service inhibiting means from inhibiting the providing means from providing the first service to at least one of the first user and the second user; a service inhibiting means adapted to inhibit, if the providing means operates in the isolated mode, the providing means from providing the second service to the first user and the second user, wherein a decision to operate in the isolated mode being responsive to detection of unavailability of a first link between a radio access network and a core network; and a service maintaining means adapted to prevent the service inhibiting means from inhibiting the providing means from providing the first service to at least one of the first user and the second user; and wherein the user control means comprises: a user inhibiting means adapted to inhibit, if the providing means operates in the isolated mode, the providing means from providing the first service and the second service to the second user, wherein the decision to operate in the isolated mode being responsive to detection of unavailability of the first link between a radio access network and a core network; and a user maintaining means adapted to prevent the user inhibiting means from inhibiting the providing means from providing at least one of the first service and the second service to the first user. a user inhibiting means adapted to inhibit, if the providing means operates in the isolated mode, the providing means from providing the first service and the second service to the second user, wherein the decision to operate in the isolated mode being responsive to detection of unavailability of the first link between a radio access network and a core network; and a user maintaining means adapted to prevent the user inhibiting means from inhibiting the providing means from providing at least one of the first service and the second service to the first user.