Satellite mobile telephone cell departure prediction

摘要

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.