US 7,321,577 B2
Mobility management system by distributed mobile IP
Keiichi Shimizu, Tokyo (Japan); and Masatsugu Yano, Tokyo (Japan)
Assigned to Mitsubishi Denki Kabushiki Kaisha, Tokyo (Japan)
Appl. No. 10/492,849
PCT Filed May 15, 2003, PCT No. PCT/JP03/06073
§ 371(c)(1), (2), (4) Date Apr. 16, 2004,
PCT Pub. No. WO2004/025908, PCT Pub. Date Mar. 25, 2004.
Claims priority of application No. 2002-267786 (JP), filed on Sep. 13, 2002.
Prior Publication US 2004/0252653 A1, Dec. 16, 2004
Int. Cl. H04Q 7/24 (2006.01)
U.S. Cl. 370—338  [370/401; 709/217; 709/238] 16 Claims
OG exemplary drawing
 
1. A mobility management system using a distributed Mobile IP, in a Mobile IP network which allows a mobile node while moving to hold a current communication session, comprising:
a foreign agent control server that is located in a first subnet where the mobile node is located, performs Mobile IP signaling;
a first IP tunnel router that is located in, the first subnet, and performs IP tunnel transfer;
a home agent control server that is located in a second subnet where the mobile node is located, and performs Mobile IP signaling; and
a second IP tunnel router that is located in the second subnet, and performs IP tunnel transfer, wherein
the foreign agent control server and the first IP tunnel router constitute a virtual foreign agent, and
the home agent control server and the second IP tunnel router constitute a virtual home agent.