摘要 |
A METHOD AND APPARATUS IS PROVIDED FOR EXTENDING THE BATTERY LIFE OF A CELLULAR RADIOTELEPHONE. A CELLULAR RADIOTELEPHONE IS CONDITIONED TO OPERATE IN A PAGER-ONLY MODE WHEREIN THE RADIOTELEPHONE MAY RECEIVE SHORT MESSAGES FROM A BASE STATION WHILE CONSERVING BATTERY LIFE BY CYCLICALLY ADOPTING A DEEP-SLEEP STATE. THE BASE STATION IS NOTIFIED BY THE RADIOTELEPHONE BEFORE THE RADIOTELEPHONE ENTERS THE DEEP-SLEEP STATE THAT THE RADIOTELEPHONE IS UNABLE TO RECEIVE MESSAGES. AFTER A PERIOD OF TIME, THE RADIOTELEPHONE WAKES-UP, RE-ESTABLISHES CONTACT WITH THE BASE STATION AND NOTIFIES THE BASE STATION THAT THE RADIOTELEPHONE IS READY TO RECEIVE MESSAGES. AFTER RECEIPT OF ANY MESSAGES THE RADIOTELEPHONE REPEATS THE PROCESS.
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