Satellite selective call signalling system
First Claim
1. A satellite based transmission system including a satellite having a directing means for directing, in a predetermined sequence, the synchronous transmission of selective call messages to a plurality of geographic areas corresponding to a sequence of transmission time intervals, said satellite based transmission system comprising:
- means for identifying message traffic levels for selective call receivers operating in each of the geographic areas, and for generating at least a first receiver control signal in response thereto when the message traffic level for a particular geographic area exceeds a predetermined message traffic level;
means for encoding the selective call messages to include the first receiver control signal; and
means for transmitting the selective call messages to the satellite;
the directing means being responsive to the first receiver control signal for directing to the particular geographic area the transmission of a portion of the selective call messages directed thereto during at least a portion of the transmission time interval assigned for another geographic area.
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Accused Products
Abstract
A signalling system provides for efficient reception of message by a plurality of Earth based selective call receivers such as pagers. The signals are transmitted from satellites in orbit above the Earth. Each satellite includes a multiple lobe antenna capable of transmitting messages to a selected portion of the surface of the Earth. Methods for conserving satellite transmission power in the communication of message information are described. Furthermore, a signalling protocol transmitted by the satellite provides for power conservation by Earth based selective call receivers. Additionally, a method enabling an area of the Earth to receive messages from multiple satellites is described.
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Citations
11 Claims
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1. A satellite based transmission system including a satellite having a directing means for directing, in a predetermined sequence, the synchronous transmission of selective call messages to a plurality of geographic areas corresponding to a sequence of transmission time intervals, said satellite based transmission system comprising:
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means for identifying message traffic levels for selective call receivers operating in each of the geographic areas, and for generating at least a first receiver control signal in response thereto when the message traffic level for a particular geographic area exceeds a predetermined message traffic level; means for encoding the selective call messages to include the first receiver control signal; and means for transmitting the selective call messages to the satellite; the directing means being responsive to the first receiver control signal for directing to the particular geographic area the transmission of a portion of the selective call messages directed thereto during at least a portion of the transmission time interval assigned for another geographic area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification