Patent ID: 7640017

Claim:
A method of performing a binding procedure for a mobile node in a foreign network, the mobile node having roamed from a home network and having a home packet data protocol address, the method comprising: the mobile node sending the home packet data protocol address to an allocating node of the foreign network; the allocating node allocating or participating in the allocation of an allocated packet data protocol address to the mobile node; the allocating node receiving a received packet data protocol address of a receiving node; and based on the home packet data protocol address, the received packet data protocol address, and the allocated packet data protocol address, the allocating node sending or arranging for another network node to send a message to the receiving node, the message indicating a binding between the allocated packet data protocol address and the home packet data protocol address of the mobile node, wherein the mobile node is a Mobile Internet Protocol (MIP)-enabled mobile node, the binding procedure is a MIP binding procedure, and the allocated packet data protocol address is a MIP care of address (CoA) or co-located care of address (CoCoA).