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:
Mar. 12, 2013
Filed:
Feb. 12, 2008
Takeshi Shibata, Yokohama, JP;
Seishi Hanaoka, Tokyo, JP;
Takeshi Shibata, Yokohama, JP;
Seishi Hanaoka, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In order to maintain the reliability of telecommunication by means of the multicast wireless communication when IP multicast is used in the IP broadcast service, the network system includes a transfer apparatus for transferring multicast packets and transfer request packets and a network apparatus for receiving transfer request packets and for transferring the multicast packets to be distributed. The transfer apparatus transmits transfer requests together with transfer request packets when it transmits multicast packets to the receiver requiring unicast communication, and the network apparatus receives multicast packets, sets the destination MAC address of the multicast packet as the unicast MAC address of the receiver in response to the conversion request from the transfer apparatus and transfers multicast packets.