Communication control method, base station, and user equipment

A communication control method used in a mobile communication system, the communication control method comprising:

• receiving, at a base station shared by a plurality of core networks from each of the plurality of core networks, an MBS service identifier indicating an MBS service provided by the corresponding one of the plurality of core networks;
• transmitting, at the base station, MBS data belonging to the MBS service to a plurality of user equipments belonging to a plurality of Public Land Mobile Networks (PLMNs) corresponding to the plurality of core networks through multicast or broadcast;
• and
• receiving, at the base station from one core network of the plurality of core networks, information indicating whether sharing of a radio resource and/or a core network resource for transmitting the MBS data with another core network is permitted,
• wherein the MBS service identifier is a unique identifier independent of the plurality of PLMNs.