Patent ID: 8824352

Claim:
A method for processing handover state information, comprising: receiving, by a mobile access gateway (MAG), a handover state notification message from a mobile node (MN) that has accessed the MAG, wherein the handover state notification message is a Point-to-Point Protocol (PPP) configuration request message, the handover state notification message comprises a Internet Protocol version 6 Control Protocol (IPv6CP) Header, the IPv6CP Header comprises interface handover indication information, and the interface handover indication information is a HO flag, the HO flag is in a type, length, and value (TLV) format, the value of the HO flag is one of “1”, “2” and “3”, wherein if the HO is set to “1”, it indicates an attachment of the MN over a new interface, if the HO is set to “2”, it indicates a handover between different interfaces of the MN, if the HO is set to “3”, it indicates a handover between different MAGs over a same interface; determining, by the MAG, when the value of the HO flag is “1”, a handover indication option value that is used for instructing a local mobility anchor (LMA) to allocate, to the MN, a new unique home network prefix (HNP) that is different from an existing HNP used by a existing interface through which the MN accesses the MAG; determining, by the MAG, when the value of the HO flag is “2”, a handover indication option value that is used for instructing the LMA to allocate a same HNP used by the existing interface to the MN; determining, by the MAG, when the value of the HO flag is “3”, a handover indication option value that is used for instructing the LMA to allocate a same HNP used by the same interface between different MAGs to the MN; and generating and sending, by the MAG, a proxy binding update (PBU) message to the LMA, wherein the PBU message comprises the handover indication option value.