Patent ID: 6219564
Filing Date: 2001-04-17
Classification: H04B

Abstract:
A digital mobile telecommunications station having a high frequency timebase circuit for generating a mobile telecommunications station timebase which is synchronized with a base station timebase, said digital mobile telecommunication station comprising:shutting-down means for shutting down said high frequency timebase circuit for a predetermined shutdown period for power saving purposes; andre-synchronizing means for re-synchronizing the mobile telecommunications station timebase following completion of the shutdown period,said re-synchronizing means comprising:a low frequency clock;a first counter for counting a number of cycles of said low frequency clock;a second counter for counting a number of cycles of a high frequency clock of the timebase circuit;first storage means for storing a first count corresponding to the number of cycles of said high frequency clock counted by said second counter at a first specified point in a timebase cycle during operations required to commence the shutdown period;second storage means for storing a second count corresponding to the number of cycles of said high frequency clock counted by said second counter at a second specified point in a timebase cycle following completion of the shutdown period; andtimebase correction means for correcting the mobile telecommunications station timebase after completion of the shutdown period on the basis of the number of cycles of the low frequency clock during the shutdown period, the first and second counts stored in said first and second storage means and data identifying said first and second points in the timebase cycles.