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

摘要

The present invention provides a mobile communication system which is capable of effectively using network resources by defining a control method for releasing network resources by a counting function of a base station device. In a mobile communication system of the present invention for performing broadcast data distribution by an MBMS bearer service from a BM-SC to a mobile station device which 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, if broadcast data distribution which has been associated with the MBMS bearer context is to be stopped, transmits to the SGSN a session stop request which has been associated with the MBMS bearer context, stops the broadcast data distribution, and releases the MBMS bearer resource for the SGSN.