Patent ID: 8665849

Claim:
A method for implementing inter-network roam, wherein, the method is applied in a network of access identifier and location identifier separation, in the network, an access identifier (AID) is used as a user identity identifier of a terminal and a routing identifier (RID) is used as a location identifier of the terminal, and the method comprises: after attaching to an Access Service Node (ASN) of a roaming area network, a roaming terminal sending a first data packet to a destination device, wherein a destination address of the first data packet is the AID of the destination device; after receiving the first data packet, the ASN in the roaming area network querying locally AID-RID mapping information, and requesting a roaming gateway to query the RID of the destination device if the RID of the destination device is not found and the destination device does not belong to the roaming area network; the roaming gateway querying the RID of the destination device from a home network of the destination device and returning the RID of the destination device to the ASN in the roaming area network; and according to the RID of the destination device, the ASN in the roaming area network sending subsequent data packets of the roaming terminal to the destination device.