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. 06, 2012
Filed:
Dec. 03, 2008
Nodoka Mimura, Kunitachi, JP;
Norihisa Matsumoto, Fuchu, JP;
Nodoka Mimura, Kunitachi, JP;
Norihisa Matsumoto, Fuchu, JP;
Hitachi Kokusai Electric Inc., Tokyo, JP;
Abstract
There is provided a communication system in which semi-duplex many-to-many multicasting service can be performed to both a mobile station and a base station by using a unified call control protocol such as SIP on an IP network, and can contain mobile stations and base stations of existing wireless facilities. The communication system in which the semi-duplex many-to-many multicasting service is performed to plural mobile stationsandincludes a gatewayto convert a first protocol to connect the mobile station, a base stationand the gateway, and a second protocol to connect the gateway, a call control serverand a press-talk server. The gatewaysandperform the protocol conversion for both communication to the mobile station and communication to the base station, so that the semi-duplex many-to-many press-talk can be realized.