Spot beam location method and apparatus
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United States of America Patent
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Feb 18, 2003
Grant Date -
N/A
app pub date -
Sep 14, 1998
filing date -
Jul 28, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A mobile terminal (6) communicates via a satellite (8), which projects a number of overlapping spot beams (10), with a fixed earth station (2). To determine which spot beam (10) is to be used for communication, the mobile terminal signals in a common signalling channel which is simultaneously received by all, or a subgroup of, the spot beams (10). The satellite (8) retransmits to the fixed earth station (2) in separate channels the signal as received by each of the spot beams (10) which are able to receive the common signalling channel. The relative strengths of the signal as received in the different spot beams (10) are compared at the fixed earth station and a communications channel is assigned to the mobile terminal in one of the spot beams (10), selected according to the comparison of signal strengths.
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