Acknowledge back pager with adaptive variable transmitter...

Details Acknowledge back pager with adaptive variable transmitter... Acknowledge back pager with adaptive variable transmitter...

H - Electricity

04

Q

325/19, 325/41

H04Q 1/30 (2006.01) G08B 5/22 (2006.01) H04Q 7/12 (2006.01)

Patent

CA 1292042

ABSTRACT OF THE DISCLOSURE An acknowledge back (ack-back) pager is provided for receiving paging signals from a central paging station. The central paging station transmits a group of message signals to a group of ack-back pagers which are addressed as a group. The users of the group of addressed ack-back pagers indicate a response to their respective pagers thus providing ack-back data. The pagers in the group of addressed ack-back pagers then simultaneously transmit back to the central station their ack-back data on different frequency sub-band , a different frequency sub-band being dynamically allocated to each of the pagers in the group. Each ack-back pager determines whether the paging signals received thereby exhibits a signal level less than a predetermined threshold level. If the paging signals received by a particular ack-back pager exhibit a signal level less than such predetermined threshold level, then the pager transmits back to the central station at a first output power level. Otherwise, the pager transmits at a second output power level substantially less than the first output power level. In this manner, the problem of the ack-back signal from a particular pager being 80 strong at the central station as to mask other simultaneous ack-back signals is substantially ameliorated.

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