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:
May. 09, 2006
Filed:
Jul. 31, 1997
Nobuyuki Kawai, Chofu, JP;
Hok Shuen Wong, Guildford, GB;
Michael John Mctiffin, Winchester, GB;
David Randall, Romsey, GB;
Nobuyuki Kawai, Chofu, JP;
Hok Shuen Wong, Guildford, GB;
Michael John McTiffin, Winchester, GB;
David Randall, Romsey, GB;
Inmarsat Ltd., London, GB;
Abstract
Data relating to the status of usersin a mobile communications system is broadcast via satellitefrom a network registerto local registersin an HDLC format. Each of the local registersrequests retransmission of any HDLC frames which are incorrectly received. The network registerrecords the earliest transmitted frame not yet acknowledged by all of the local registers and inhibits transmission of new frames if they fall outside a transmission window relative to the earliest transmitted frame. The network registerpolls the local registersfor retransmission requests and the local registersalso send unsolicited requests to the network register. The network registeronly retransmits a frame once if multiple requests for that frame are transmitted within a predetermined period. When a new local registerenters the broadcast reception group, the network registerinforms the new local registerwhich new frame will next be transmitted. The number of bits used for frame sequence numbers is greater than that defined in the HDLC protocols.