PACKET DATA NETWORK GATEWAY AND MOBILE COMMUNICATION SYSTEM WITH DEFAULT RAT-TYPE AND METHOD THEREOF

摘要

The present invention relates to an access network in which an IP network is allocated to a terminal in an EPC network and a packet data network gateway for controlling a session for interworking with an external Internet network and a non-3GPP network is connected to an access network Define the default RAT-TYPE parameter information for each interface in advance and grasp the type of the corresponding access network defined in the default RAT-TYPE parameter information when requesting access from the access network, thereby enabling service according to the access network .