Patent ID: 7463606

Claim:
A method for establishing a mobile Internet protocol (MIP) by a mobile node, the method comprising: the mobile node establishing the (MIP) with at least two wireless packet service systems, each of which a serving GPRS support node (SGSN) and a gateway GPRS support node (GGSN), wherein said establishing includes: a first SGSN connected to a mobile node transmitting predetermined first connection information on the mobile node to at least one or more second SGSNs adjacent to the first SGSN; the second SGSN receiving the first connection information storing the first connection information as a database item, and transmitting first connection acknowledgement message to the first SGSN; when reception of the connection acknowledgement message is successful, the first GGSN connected to the first SGSN transmitting predetermined second connection information on the mobile node to at least one or more second GGSNs connected to the second SGSN; and the second GGSN receiving the second connection information and then transmitting a second connection acknowledgement message to the second GGSN.