Satellite mobile telephone cell departure prediction
First Claim
1. A method of operating a satellite mobile telephone having a sleep mode to conserve power and an awake mode to receive satellite signals in a satellite mobile telephone system in which a plurality of cells move across the surface of the Earth as a satellite orbits, comprising:
- receiving data indicative of relative movement of a cell-predicting when the satellite mobile telephone will leave the cell using the received data; and
the satellite mobile telephone using the prediction of when the satellite mobile telephone will leave the cell to reduce resource utilization of the satellite mobile telephone.
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Accused Products
Abstract
A mobile station (4) in a satellite mobile telephone system predicts when it will move into another cell on the basis of one set of broadcast information thereby reducing the overall processing burden. The mobile station (4) can predict with a useful degree of certainty which broadcast control channel (BOCH) frequencies it should listen on when it wakes up on the basis of a stored map of the relative positions of cells. The broadcast information is valid for a predetermined time interval. Upon waking up, the mobile station (4) determines present time within the predetermined time interval and uses the broadcast information as well as the present time within the predetermined time interval to predict the time at which the mobile telephone will leave the cell.
42 Citations
19 Claims
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1. A method of operating a satellite mobile telephone having a sleep mode to conserve power and an awake mode to receive satellite signals in a satellite mobile telephone system in which a plurality of cells move across the surface of the Earth as a satellite orbits, comprising:
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receiving data indicative of relative movement of a cell-predicting when the satellite mobile telephone will leave the cell using the received data; and the satellite mobile telephone using the prediction of when the satellite mobile telephone will leave the cell to reduce resource utilization of the satellite mobile telephone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A mobile device having a sleep mode to conserve power and an awake mode to receive satellite signals for use in a satellite mobile telephone system in which a plurality of cells move across the surface of the Earth as a satellite orbits, the mobile device comprising:
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a receiving means for receiving data indicative of relative movement of a cell-predicting when the satellite mobile telephone will leave the cell using the received data; and a prediction means that uses the received data indicative of relative movement of a cell to predict when the satellite mobile telephone will leave the cell to reduce resource utilization of the satellite mobile telephone.
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Specification