Satellite mobile telephone cell departure prediction
First Claim
1. A mobile telephone for a satellite mobile telephone system, the mobile telephone having an active mode during which a telephone call can be processed and an inactive mode during which no telephone call can be being processed, the mobile telephone comprising:
- a memory configured to store information related to the movement of a current cell across the Earth'"'"'s surface the information being valid for a predetermined time interval; and
a processor to process the information and thereby make a prediction of a time at which the mobile telephone will depart the current cell, the processor, upon the mobile telephone entering the active mode, causing the mobile telephone to scan a predetermined set of communication channels, less than all communication channels, if a present time is within the predetermined time interval.
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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
11 Claims
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1. A mobile telephone for a satellite mobile telephone system, the mobile telephone having an active mode during which a telephone call can be processed and an inactive mode during which no telephone call can be being processed, the mobile telephone comprising:
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a memory configured to store information related to the movement of a current cell across the Earth'"'"'s surface the information being valid for a predetermined time interval; and a processor to process the information and thereby make a prediction of a time at which the mobile telephone will depart the current cell, the processor, upon the mobile telephone entering the active mode, causing the mobile telephone to scan a predetermined set of communication channels, less than all communication channels, if a present time is within the predetermined time interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification