Synchronized paging system

Details Synchronized paging system Synchronized paging system

1996-07-19

1997-09-02

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

34082544, 370350, 455 313, H04Q 100

Patent

active

056637152

ABSTRACT:
A two-way paging system includes a paging terminal and one or more transmitters and receivers. The paging terminal, transmitter and receiver are synchronized to a common clock reference which is derived from the global positioning satellite system. The transmitter transmits paging signals in sequential frames having a predefined start time and duration. A paging unit is instructed to transmit its acknowledge signal during a predefined time slot. By synchronizing the paging terminal transmitters and receivers to a common clock the receivers are able to determine the frame number and time slot during which an acknowledge signal is transmitted based on the time of reception of the acknowledge signal. If the acknowledge signal is transmitted during the correct flame and time slot, the paging system can determine that the paging unit has received the paging message correctly.

REFERENCES:
patent: 5396230 (1995-03-01), Motegi
patent: 5420576 (1995-05-01), Matai
patent: 5485463 (1996-01-01), Godoroja
patent: 5495233 (1996-02-01), Kawashima
patent: 5555183 (1996-09-01), Willard

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