EP0583523A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Pager with reverse paging facility
Assignee: Nexus Telecommunication Systems Ltd
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Filing: 1992-12-30
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Granted: —
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Expires: 2012-12-30
Abstract
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.
Inventors
- 👤 Hanoch Yokev
- 👤 Haim Harel
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 14:46
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/713; H04B1/7156; G; G01; G01S; G01S1/00; G01S1/02; G01S1/022; G01S1/026; G01S3/00; G01S3/02; G01S3/023; G01S3/04; G01S3/043; G01S3/10; G01S5/00; G01S5/0009; G01S5/02; G01S5/0205; G01S5/021; G01S5/04; H04B7/00; H04B7/24; H04B7/26; H04B7/2662; H04B7/2671; H04B7/2678; H04B7/2681; H04B7/2687; H04B7/2693; H04W; H04W64/00; H04W88/00; H04W88/02; H04W88/022
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
98 words
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 transit a message to the at least one base station.
Claim 2
Dependent Claim
39 words
Apparatus according to claim 1 wherein the base station includes: a base receiver which receives the radiated frequency hopped signal; and signal identification circuitry operative for identifying the remote unit based on the frequency sequence of received frequency-hopped signal.
Claim 3
Dependent Claim
22 words
Apparatus according to claim 1 or claim 2 wherein the base station also includes means for determining direction of the remote unit.
Claim 4
Dependent Claim
29 words
Apparatus according to any of the preceding claims wherein the remote unit includes means for providing an activating signal to activate the mobile transmitter in response to activation signals.
Claim 5
Dependent Claim
18 words
Apparatus according to claim 4 wherein the activation signal is produced by a carrier of the remote unit.
Claim 6
Dependent Claim
21 words
Apparatus according to claim 4 wherein the activation signal is transmitted by the bases station and received by the remote unit.
Claim 7
Dependent Claim
30 words
Apparatus according to any of the preceding claims wherein the remote unit further comprises a frequency synthesizer which produces a frequency responsive to the resonant frequency of a resonant circuit.
Claim 8
Dependent Claim
33 words
Apparatus according to claim 7, wherein the resonant circuit includes a fixed high-Q element and a perturbating element which is periodically switched into the resonant circuit whereby the resonant frequency is periodically switched.
Claim 9
Dependent Claim
13 words
Apparatus according to claim 8 wherein the fixed high-Q element is a crystal.
Claim 10
Dependent Claim
16 words
Apparatus according to claim 9 wherein the perturbating element is a capacitor switched by a diode.
Claim 11
Dependent Claim
65 words
Apparatus according to any of the preceding claims wherein the message generator comprises: a frequency generator which generates a sequence of pulses each having one of two nearby frequencies in response to an input; and an encoder which chooses a particular pulse sequence responsive to an input by a carrier of the remote unit, whereby the particular sequence represents a message chosen by the carrier.
Claim 12
Dependent Claim
68 words
A reverse paging transmission system comprising: a plurality of portable remote units; and a base station operative to transmit messages to any one of the remote units, wherein the remote unit is operative, when activated by a carrier of the remote unit, to transmit coded messages to the base station and the base station is operative to transmit the messages to a destination indicated by the remote unit.
Claim 13
Dependent Claim
33 words
Apparatus according to claim 11 or claim 12 wherein the base station comprises: a decoder which receives and decodes the sequence; and a message dispatcher which dispatches the message to an intended destination.
References Cited (Backward Citations)
No citation records indexed.
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