Satellite mobile telephone cell departure prediction
First Claim
1. A method of operating a satellite mobile telephone in which a plurality of cells move across the surface of the Earth as a satellite orbits, comprising:
- subsequent to completion of a registration process, receiving data related to a position and movement of a cell relative to the Earth'"'"'s surface;
determining a position of mobile telephone; and
while the mobile telephone is not actively processing a telephone call, using the received data and the position of the mobile telephone to determine, at the mobile telephone, a prediction for the time when the mobile telephone will leave the cell.
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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 (BCCH) 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 includes information about the current cell'"'"'s (40) shape (V1, V2, V3, V4, V5, V6) and translational (T) and rotational (R) motion.
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Citations
21 Claims
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1. A method of operating a satellite mobile telephone in which a plurality of cells move across the surface of the Earth as a satellite orbits, comprising:
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subsequent to completion of a registration process, receiving data related to a position and movement of a cell relative to the Earth'"'"'s surface; determining a position of mobile telephone; and while the mobile telephone is not actively processing a telephone call, using the received data and the position of the mobile telephone to determine, at the mobile telephone, a prediction for the time when the mobile telephone will leave the cell. - View Dependent Claims (2, 3, 4, 5, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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- 6. The method of 5 wherein determining a prediction comprises the mobile telephone predicting a selected one of the plurality of sub-periods during which it will leave the cell on the basis of the members of the set of translational vectors.
Specification