Satellite mobile telephone cell departure prediction
First Claim
Patent Images
1. A method of operation of a satellite mobile telephone system in which a plurality of cells move across the surface of the Earth as a satellite orbits, the method comprising the steps of:
- providing a mobile station with information related to the movement of a cell relative to the Earth'"'"'s surface, including rotational movement of the cell; and
while the mobile station is not in a call, determining at the mobile station a prediction for the time when the mobile station will leave said cell on the basis of said received information; and
waiting for a period set in dependence on said prediction and then starting to perform a cell selection operation.
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Abstract
A mobile station 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 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 shape and translational and rotational motion.
34 Citations
26 Claims
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1. A method of operation of a satellite mobile telephone system in which a plurality of cells move across the surface of the Earth as a satellite orbits, the method comprising the steps of:
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providing a mobile station with information related to the movement of a cell relative to the Earth'"'"'s surface, including rotational movement of the cell; and
while the mobile station is not in a call, determining at the mobile station a prediction for the time when the mobile station will leave said cell on the basis of said received information; and
waiting for a period set in dependence on said prediction and then starting to perform a cell selection operation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operation of a satellite mobile telephone system in which a plurality of cells move across the surface of the Earth as a satellite orbits, the method comprising the steps of:
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providing a mobile station with information related to the movement of a cell relative to the Earth'"'"'s surface; and
while the mobile station is not in a call, determining at the mobile station a prediction for the time when the mobile station will leave said cell on the basis of said received information, waiting for a period set in dependence on said prediction and then starting to perform a cell selection operation, wherein said cells rotate in their plane as they move across the surface of the Earth and said information includes information regarding rotational movement of the cell in its own plane. - View Dependent Claims (9, 10, 11, 12, 13, 14)
waiting for a period set in dependence on said prediction and then starting to perform a cell selection operation.
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- 15. A mobile telephone for a satellite mobile telephone system, including memory means for storing control data including geographical information related to the movement, including rotational movement, of a cell across the Earth'"'"'s surface and processing means configured for processing said information to make a prediction of when the mobile station will depart the current cell, and, while not in a call, waiting for a period set in dependence on said prediction and then starting to perform a cell selection operation.
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22. A mobile telephone for a satellite mobile telephone system, including memory means for storing control data including geographical information related to the movement of a cell across the Earth'"'"'s surface and processing means for processing said information to make a prediction of when the mobile station will depart the current cell,
wherein the processing means is configured to predict a cell departure time for the mobile station on the basis of the members of a set of translational vectors comprised in said information and defining the traversing of the cell over the surface of the Earth, and wherein said cells rotate in their own planes as they move across the surface of the Earth and the processing means is configured to predict the cell departure time on the basis of a set of vectors comprised in said information and defining the rotation of the cell in its own plane.
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24. A mobile radio communication apparatus comprising:
- a memory for storing control data including information related to the movement of a cell across the Earth'"'"'s surface, including information regarding cell rotation;
a processor programmed to calculate, based on the stored information, a predicted time that the mobile radio communication apparatus will leave a cell in which it is currently located, to set an idle mode timer for an idle mode of the processor based on the predicted time, and to start to perform a cell selection operation when the processor is awakened by the timer. - View Dependent Claims (25)
- a memory for storing control data including information related to the movement of a cell across the Earth'"'"'s surface, including information regarding cell rotation;
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26. A method of operation of a satellite mobile telephone system in which a plurality of cells move across the surface of the Earth as a satellite orbits, the method comprising the steps of:
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providing a mobile station with information, including rotational information, related to the movement of a cell relative to the Earth'"'"'s surface; and
while the mobile station is not in a call, determining at the mobile station a prediction for the time when the mobile station will leave said cell on the basis of said received information; and
waiting for a period set in dependence on said prediction and then determining a new cell to select and starting a selection operation to select that new cell.
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Specification