Patent ID: 8406237

Claim:
A method for implementing proxy mobile Internet protocol (PMIP) in mobile IP foreign agent care-of-address mode, the method being performed by a network node that acts as a proxy performing mobile IP client functionality in an access terminal, the method comprising: determining a home address of the access terminal; communicating with a source base station and a local mobility home agent wherein the source base station sends an access request to an authentication, authorization, and accounting (AAA) device, the AA device replies with an access accept message that includes a home address of the access terminal; generating and exchanging session keys by the access terminal and source base station; sending a dynamic host configuration protocol request from the access terminal to the source base station; receiving a dynamic host configuration protocol reply from the source base station, wherein the dynamic host configuration reply includes the home address of the access terminal; obtaining, by the source base station, all foreign agent care of addresses of all access terminals served by the source base station; creating a binding at the local mobility home agent between at least one access terminal served by the source base station, wherein the binding is between an address of the proxy mobile internet protocol network node and the home address of at the at least one access terminal served by the source base station, and also to establish a tunnel between the proxy mobile IP network node and the local mobility home agent, wherein the local mobility home agent is separate from a home agent in the access terminal's home network; receiving, at the proxy mobile IP network node, first packets destined for the access terminal from the local mobility home agent via the tunnel and sending the first packets to the access terminal without using any tunnel; and receiving second packets sent by the access terminal that are destined for a correspondent node and sending the second packets to the local mobility home agent via the tunnel.