The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 2010
Filed:
Feb. 12, 2007
Kazuyuki Oka, Kawasaki, JP;
Kazuyuki Oka, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
If a trouble, which occurred in a node managing positional information, has been solved, the positional information can be restored only by transmitting a position registration request addressed to one multicast address without need to transmit multiple position registration requests addressed to multiple mobile terminals (MN). There are included a home agent, a mobile anchor point and a communication node, each of which is a node connected to a network. Each node receives a position registration from a mobile terminal, copies a binding cache to produce a backup binding cache, and maintains and manages the backup binding cache. When recovering from a trouble, each of the home agent, mobile anchor point and communication node searches for the backup binding cache to acquire the binding cache held before occurrence of the trouble; then designates an already registered multicast address for a mobile terminal stored in the acquired binding cache; sends a packet of position registration request to the mobile terminal; regards the acquired binding cache as being valid when a response to the position registration request packet is received from the mobile terminal; and then continues to maintain and manage the acquired binding cache.