| 摘要 |
A paging system broadcasts a message to a selected remote pager at a known broadcast time. The selected remote pager transmits an acknowledge signal (84) following a predetermined delay relative to the broadcast time. The paging system verifies receipt of the message by offsetting the time of receiving the acknowledge signal with the predetermined delay (146), thereby deriving the broadcast time and associating the acknowledge signal with the selected remote pager (150). The remote pager broadcasts a low wattage acknowledge signal to conserve power and the paging system includes a network of acknowledge signal receivers distributed through the paging area for reporting times at which acknowledge signals occur within the paging area. |
