| 摘要 |
PURPOSE: An APN(Access Point Name) management method for a packet termination service in a mobile communication system is provided to discriminate an external network by retrieving APN information in a GGSN(Gateway GPRS(General Packet Radio Service) Support Node) by an IP(Internet Protocol) packet. CONSTITUTION: A GGSN extracts a network prefix from an IP packet transmitted from a certain external network. The GGSN uses the network prefix as a key value, and retrieves an APN information object, corresponding to the network prefix, including information about a sub network. If one or more sub network information exists in the retrieved APN information object, the GGSN ANDs a source IP address and a subnet mask included in the APN information object and calculates a new network prefix(S270). The GGSN uses the calculated new network prefix as a key value, and retrieves an APN information object again(S280). If sub network information does not exist in the retrieved APN information object(S290), the GGSN finally decides an APN value included in the retrieved APN information object as an APN about the external network. |
