MOBILE COMMUNICATION SYSTEM, MOBILE STATION DEVICE, BASE STATION DEVICE, SGSN, GGSN, MME, MBMS GW AND MOBILE COMMUNICATION METHOD

摘要

To provide a mobile communication system and the like that can efficiently use network resources, by defining a control method of releasing network resources by a counting function of a base station device. In a mobile communication system that performs distribution of broadcast data by an MBMS bearer service, from a BM-SC to a mobile station device that is connected to a base station device, via a GGSN and an SGSN for which an MBMS bearer has been established, the base station device transmits a session stop request associated with the MBMS bearer context to the SGSN when stopping the distribution of broadcast data associated with the MBMS bearer context, and stops distribution of broadcast data to thereby release the MBMS bearer resources between the base station device and the SGSN.