| 摘要 |
A method and apparatus for transmitting common information to a plurality of user terminals within a geographic region. The method and apparatus are usef ul 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 dat a channels (702) over which the common information will be transmitted. The li st can include, for each of said plurality of common data channels, information identifying a predetermined satellite, beam (401-416), frequency, and channe l. 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 t o 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 t he plurality of common data channels.
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