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:
Dec. 25, 2007
Filed:
Apr. 05, 2002
Seiichiro Tani, Atsugi, JP;
Toshiaki Miyazaki, Yokohama, JP;
Noriyuki Takahashi, Yokosuka, JP;
Takahiro Murooka, Atsugi, JP;
Shinya Ishihara, Tokyo, JP;
Takeru Inoue, Yokohama, JP;
Seiichiro Tani, Atsugi, JP;
Toshiaki Miyazaki, Yokohama, JP;
Noriyuki Takahashi, Yokosuka, JP;
Takahiro Murooka, Atsugi, JP;
Shinya Ishihara, Tokyo, JP;
Takeru Inoue, Yokohama, JP;
Nippon Telegraph & Telephone Corporation, Tokyo, JP;
Abstract
A multicast data communication system is provided that has high security, and prevents problems such as an attack by a malicious user creating a great number of meaningless tables at nodes in the network. Clients regularly transmit request packets toward a server; a node receives the request packet, and subsequently receives a delivery-table-creation packet or a delivery packet from the server; if the node has no delivery table corresponding to the server, the node creates the delivery table, registers the addresses of the clients, and their request packet arrival times, and regularly transmits the request packet toward the server; when the node has received a delivery packet from the server, the node duplicates and delivers the delivery packet only to those clients whose request packet arrival times, registered in the delivery table, are within a fixed period from the arrival of the delivery packet.