SGW SGW MOBILE COMMUNICATION SYSTEM SGW TERMINAL RECEPTION METHOD OF MOBILE COMMUNICATION SYSTEM RECEPTION METHOD OF SGW AND RECEPTION METHOD OF TERMINAL

摘要

A mobile communication system according to an exemplary embodiment of the present invention includes a UE 45, an MME 25, a SGSN 27, and an SGW 15. [ The SGW 15 sends a Downlink Data Notification (DDN) message to the MME 25 and the SGSN 27 when the ISR is active in the UE 45, MME 25, SGSN 27 and SGW 15 And a Modify Bearer Request message is received from another MME 35 or another SGSN 37 different from the MME 25 and the SGSN 27, Means for retransmitting a downlink data notification message only to another SGSN (35) or another SGSN (37).