Acknowledge back pager with adaptive variable transmitter output

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

1988-01-07

1989-04-25

Crosland, Donnie L.

Communications: electrical

Systems

Nonselective paging

340502, 34082544, 34082547, 455127, H04Q 130, G08B 522

Patent

active

048251933

ABSTRACT:
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-bands, 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 ouput 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 so strong at the central station as to mask other simultaneous ack-back signals is substantially ameliorated.

REFERENCES:
patent: 4194153 (1980-03-01), Masaki et al.
patent: 4392242 (1983-07-01), Kai
patent: 4604583 (1986-08-01), Aoyagi et al.
patent: 4636741 (1987-01-01), Mitzlaff
patent: 4654882 (1987-03-01), Ikeda

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