Patent ID: 8908637

Claim:
A method for discovering a home link in mobile IP, comprising: when a UE is attached to a network, an access network assigning an address as Care of Address (CoA) to the UE; the UE acquiring a Home Address (HoA) from the network; the UE comparing the CoA with the HoA, and determining that the UE is attached to the home link in the case that the CoA is the same as the HoA; wherein during the UE obtains the home address from the network, the home address is sent to the UE by the access network or the home agent; wherein the access network and the home agent share a same address space and use same identity information to identify the UE; wherein in the case that any one of the access network and the home agent assigns an address to the UE, the method further comprises: inquiring whether the UE has been assigned with an address according to the identity information of the UE; in the case that it is inquired that the address has been assigned, the UE is assigned with the same address as the address that has been assigned; wherein the method further comprises the following process after the access network assigns an address to the UE, the access network registering, in an address assignment table, the identity information of the UE, the address assigned to the UE and the association relationship between the identity information and the assigned address; wherein the method further comprises: the home agent searching the address assigned to the UE in the address assignment table through the association relationship between the identity information of the UE and the assigned address; if the address corresponding to the identity information is searched out, the home agent regarding the searched address as a home address.