Apparatus and method for sending common information on...

H - Electricity – 04 – B

Patent

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H04B 7/185 (2006.01)

Patent

CA 2345792

A method and apparatus for transmitting common information to a plurality of user terminals within a geographic region. The method and apparatus are useful in a satellite communication system (100) having a gateway (120, 122), and a plurality of satellites (116, 118) that orbit such that they are not stationary with respect to a point on the surface of the Earth. The method includes the step of generating a list identifying a plurality of common data channels (702) over which the common information will be transmitted. The list can include, for each of said plurality of common data channels, information identifying a predetermined satellite, beam (401-416), frequency, and channel. Due to the orbiting of the satellites (116, 118), the list changes over time. The method also includes the steps of transmitting (708), from the gateway to the geographic region (502, 504, 520, 522), the common information on the plurality of common data channels. The method also includes receiving (720), at a user terminal (124, 126), the common information over at least one of the plurality of common data channels.

Cette invention a trait à un appareil et au procédé correspondant permettant de transmettre une information commune à plusieurs postes d'utilisateurs dans une région géographique donnée. Cet appareil et le procédé correspondant se révèlent des plus utiles dans un système de communications par satellites (100) équipé d'une passerelle (120, 122) et de plusieurs satellites orbitant de manière à ne pas rester en position stationnaire par rapport à un point de la surface de la Terre. Le procédé consiste à élaborer une liste identifiant plusieurs canaux de données communes (702) sur lesquels sera transmise l'information commune. Cette liste peut contenir, pour chaque canal, une information identifiant un satellite prédéterminé, un faisceau (401, 416), une fréquence et un canal. Du fait du déplacement orbital des satellites (116, 118), la liste change avec le temps. Le procédé consiste également à émettre (708) depuis la passerelle en direction de la région géographique (502, 504, 520, 522), l'information commune sur les canaux de données communes. Il consiste, en outre, à recevoir (720), au niveau du poste d'utilisateur (124, 126), l'information commune transitant par au moins l'un des canaux de données communes.

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