US 7,577,425 B2
	Method for securing access to mobile IP network
Satomi Okazaki, Palo Alto, Calif. (US); Atsushi Takeshita, Sunnyvale, Calif. (US); Yiqun Yin, San Mateo, Calif. (US); and Aki Yokote, San Francisco, Calif. (US)
Assigned to NTT DOCOMO Inc., Tokyo (Japan)
Filed on May 15, 2002, as Appl. No. 10/146,548.
Claims priority of provisional application 60/332396, filed on Nov. 09, 2001.
Claims priority of provisional application 60/345967, filed on Nov. 09, 2001.
Prior Publication US 2003/0092425 A1, May 15, 2003
This patent is subject to a terminal disclaimer.
Int. Cl. H04M 1/66 (2006.01)

U.S. Cl. 455—411  [455/436; 455/432.1; 380/281; 380/282; 380/45]

37 Claims

1. A communication network comprising a plurality of administrative domains each served by at least one administrative server and each having at least one mobility agent deployed therein, wherein each mobility agent offers connectivity to a mobile node via an advertisement message which is certified by a trusted entity for authentication by the mobile node.