Patent ID: 7751816
Filing Date: 2010-07-06
Classification: H04W

Abstract:
1. A mobile Internet Protocol (IP) network system in a mobile IP environment, the mobile IP network system comprising: a first foreign agent of a first foreign subnet, the first foreign agent having information on care-of-addresses of foreign agents of subnets adjacent to the first subnet; a second foreign agent of a second subnet; and a mobile node which registers on a home agent of the mobile node via the second foreign agent if the mobile node moves from the first subnet to the second subnet, wherein the mobile node receives, from the first foreign agent, a message containing the care-of-addresses of the foreign agents adjacent to the first subnet, collects the care-of-addresses from the message, and sequentially broadcasts a plurality of messages each including one of the collected care-of-addresses if the mobile node moves to the second subnet, and wherein the second foreign agent receives the plurality of messages broadcast from the mobile node, extracts the care-of-addresses in the received plurality of messages, and transmits one of the care-of-addresses to the home agent to register the mobile node on the home agent if the one of the care of address is identical to a care-of-address allocated by the second foreign agent.