Pager with reverse paging facility
First Claim
1. Paging apparatus comprising:
- at least one base station including a base transmitter which periodically transmits timing signals; and
a plurality of remote units, each including;
a mobile receiver operative to receive timing signals transmitted by at least one base transmitter;
synchronization circuitry receiving the timing signals and providing a spread spectrum frequency-hopping sequence characteristic of the particular remote unit;
a mobile transmitter producing a radiated frequency-hopped signal responsive to the frequency-hopping sequence and the timing signal; and
a message generator operative to modify the radiated frequency-hopped signal to transmit a message to at least one base station.
4 Assignments
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Accused Products
Abstract
Position determining apparatus including at least one base station including a base transmitter which periodically transmits timing signals and a plurality of mobile remote units. Each remote unit includes a mobile receiver operative to receive timing signals transmitted by at least one base transmitter; synchronization circuitry receiving the timing signals and providing a spread-spectrum frequency-hopping sequence characteristic of the particular remote unit; a mobile transmitter producing a radiated frequency-hopped signal responsive to the frequency-hopping sequence and the timing signal; and a message generator operative to modify the radiated frequency-hopped signal to transmit a message to the at least one base station. least one base station.
272 Citations
20 Claims
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1. Paging apparatus comprising:
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at least one base station including a base transmitter which periodically transmits timing signals; and a plurality of remote units, each including; a mobile receiver operative to receive timing signals transmitted by at least one base transmitter; synchronization circuitry receiving the timing signals and providing a spread spectrum frequency-hopping sequence characteristic of the particular remote unit; a mobile transmitter producing a radiated frequency-hopped signal responsive to the frequency-hopping sequence and the timing signal; and a message generator operative to modify the radiated frequency-hopped signal to transmit a message to at least one base station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A reverse paging transmission system comprising:
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a plurality of portable remote units; and a base station operative to transmit a first message to any one of the remote units, wherein the remote unit is operative, when activated by a carrier of the remote unit, to transmit frequency-hopped spread spectrum signals containing second messages to the base station and the base station is operative to transmit the second messages to a destination indicated by the remote unit.
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Specification