| 摘要 |
PURPOSE: A method for selecting a GGSN(Gateway GPRS Support Node) of a SGSN(Serving GPRS Support Node) in a GPRS(General Packet Radio Service) is provided to select and connect an optimum GGSN among GGSNs indicated with the same APN(Access Point Name) when an SGSN and the GGSN are connected. CONSTITUTION: IP addresses 1.1.1.1 and 1.1.2.1 of a GGSN1(104-1) and a GGSN2(104-2) are indicated with the same APN 'x'. Upon receiving the APN 'x' from a terminal, an SGSN1(102-1) inquires of its local DNS server(210-1) about it. Then, the local DNS server(210-1) searches the APN 'x' from an IP address list. If the APN 'x' exists on the IP address list, the local DNS server(210-1) transfers the IP address 1.1.1.1 of the GGSN1(104-1) corresponding to the APN 'x' to the SGSN(102-1) Upon receiving the IP address 1.1.1.1, the SGSN1(102-1) is connected to the GGSN1(104-1), thereby selecting the optimum GGSN. If the APN does not exist in the local DNS server(210-2), the local DNS server(210-1) inquires of other DNS server such as a route DNS server(300) about the APN, in order to obtain an IP address. |
