WO2002078384A1 - Method and apparatus of disabling operation of a cellular telephone in a cellular communication system - Google Patents

Method and apparatus of disabling operation of a cellular telephone in a cellular communication system Download PDF

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Publication number
WO2002078384A1
WO2002078384A1 PCT/ZA2001/000070 ZA0100070W WO02078384A1 WO 2002078384 A1 WO2002078384 A1 WO 2002078384A1 ZA 0100070 W ZA0100070 W ZA 0100070W WO 02078384 A1 WO02078384 A1 WO 02078384A1
Authority
WO
WIPO (PCT)
Prior art keywords
interference signal
signal
carriers
period
cellular telephone
Prior art date
Application number
PCT/ZA2001/000070
Other languages
French (fr)
Inventor
Johann Erich Wolfgang Holm
Original Assignee
Telegenix Trading 323 Cc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telegenix Trading 323 Cc filed Critical Telegenix Trading 323 Cc
Publication of WO2002078384A1 publication Critical patent/WO2002078384A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H04W48/04—Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/40—Jamming having variable characteristics
    • H04K3/42—Jamming having variable characteristics characterized by the control of the jamming frequency or wavelength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/40—Jamming having variable characteristics
    • H04K3/44—Jamming having variable characteristics characterized by the control of the jamming waveform or modulation type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K2203/00—Jamming of communication; Countermeasures
    • H04K2203/10—Jamming or countermeasure used for a particular application
    • H04K2203/16—Jamming or countermeasure used for a particular application for telephony

Definitions

  • THIS INVENTION relates to cellular telephone communication.
  • it relates to a method of disabling operation of a cellular telephone in a particular zone, to a cellular telephone disabling device, and to a deterministic interference signal.
  • the GSM and DCS cellular telephone communication networks operate on frequency channels which are spaced 200 kHz apart. In order to inhibit communication between a cellular telephone and a base station of the network, sufficient electromagnetic energy must be generated on each of these frequency channels. It is preferable that electromagnetic energy be generated continuously on each of these frequency channels and only on the frequency channels on which the networks operate.
  • a method of disabling operation of a cellular telephone in a particular zone including the following steps, in any order generating a deterministic interference signal so that carriers are generated continuously on every frequency channel on which the cellular telephone operates, wherein the telephone operates on frequency channels spaced apart by fixed intervals; and transmitting the interference signal in the zone thereby to inhibit communication between the cellular telephone and a base station.
  • the interference signal may include a waveform segment having at least one pulse per interference signal period, wherein the same waveform segment is repeated after every period of the interference signal, so that the carriers are generated without generating carriers on frequencies on which the telephone does not operate.
  • the method may include the step of selecting the period of the
  • the period may be selected at 5 microseconds so that the carriers are spaced by 200 kHz.
  • the method may include the step of selecting a maximum pulse width of the interference signal to ensure that a bandwidth of the interference signal is at least the same as a bandwidth in which the cellular telephone operates.
  • the maximum pulse width may be selected to ensure that the bandwidth of the interference signal is 200 MHz.
  • the interference signal may be a pseudo-noise signal wherein the maximum pulse width of the interference signal and the period of the interference signal are both selectable whereas the rest of the waveform segment is determined by an underlying deterministic process wherein the pulse sequence is known.
  • a cellular telephone disabling device for disabling a cellular telephone in a particular zone, the device including a signal source for generating a deterministic interference signal so that carriers are generated continuously on every frequency channel on which the cellular telephone operates, wherein the telephone operates on frequency channels spaced apart by fixed intervals; and transmitter means operable to transmit the interference signal in the zone thereby to disable operation of the telephone.
  • the interference signal may include a waveform segment having at least one pulse per interference signal period, wherein the same waveform segment is repeated after every period of the interference signal, so that the carriers are generated without generating carriers on frequencies on which the telephone does not operate.
  • the period of the interference signal may be selected to ensure that the carriers of the interference signal are frequencially spaced the same as the channels on which the cellular telephone operates.
  • the period may be 5 microseconds to ensure that the carriers are spaced by 200 kHz.
  • the maximum pulse width of the interference signal may be selected to ensure that a bandwidth of the interference signal is at least the same as a bandwidth in which the cellular telephone operates.
  • the maximum pulse width may be selected to ensure that the bandwidth of the interference signal is 200 MHz.
  • the interference signal may be a pseudo-noise signal wherein the maximum pulse width of the interference signal and the period of the interference signal are both selectable whereas the rest of the waveform segment is determined by an underlying deterministic process wherein the pulse sequence is known.
  • a deterministic interference signal which includes carriers on every frequency channel on which the cellular telephone operates, wherein the telephone operates on frequency channels spaced apart by fixed intervals.
  • the signal may include a waveform segment having at least one pulse per signal period, wherein the same waveform segment is repeated after every period of the signal, so that the carriers are generated without generating carriers on frequencies on which the telephone does not operate.
  • the period of the signal may be selected to ensure that the carriers of the signal are frequencially spaced the same as the channels on which the cellular telephone operates.
  • the period may be 5 microseconds to ensure that the carriers are spaced by 200 kHz.
  • the maximum pulse width of the signal may be selected to ensure that a bandwidth of the signal is-at least the same as a bandwidth in which the cellular telephone operates.
  • the maximum pulse width may be selected to ensure that the bandwidth of the signal is 200 MHz.
  • the interference signal may be a pseudo-noise signal wherein the maximum pulse width of the interference signal and the period of the interference signal are both selectable whereas the rest of the waveform segment is determined by an underlying deterministic process wherein the pulse sequence is known.
  • Figure 1 shows a block diagram of a cellular telephone disabling device in accordance with the invention
  • Figures 2 and 3 show graphical representations of a pseudo-noise signal, in the time and frequency domains respectively, in accordance with the invention.
  • Figures 4 and 5 show graphical representations of a pulse train signal, in the time and frequency domains respectively in accordance with the invention.
  • telephones using the GSM or DCS networks operate at frequencies spaced by fixed intervals 44 of 200 kHz.
  • the extended GSM band includes frequencies between 925 MHz and 960 MHz spaced by fixed intervals of 200 kHz and the DCS band includes frequencies between 1805 MHz and 1880 MHz spaced by fixed intervals of 200 kHz.
  • reference numeral 10 generally indicates a cellular telephone disabling device for disabling a cellular telephone in a particular zone.
  • the device 10 is located within a bank or the like.
  • the device 10 includes a signal source 12 for generating a deterministic interference signal 40 (shown in Figures 2 and 3) so that carriers 42 are generated continuously on every frequency channel on which the cellular telephone operates.
  • the telephone operates on frequencies spaced apart by fixed intervals 44.
  • the signal source 12 includes a reference frequency generator 14 which generates a reference frequency which is in turn used to centre a carrier source at the centre of the GSM or DCS down-link channels.
  • the signal source 12 also includes a carrier source generator in the form of a synthesised or PLL source 16 for generating the carrier source for accurate placement in either the GSM or DCS down-link channels.
  • the signal source 12 further includes a pattern generator 18 for generating a waveform pattern so that carriers 42 are spaced 200 kHz apart with a bandwidth of 200 MHz.
  • a mixer or alternatively an up-converter 20 is used to mix the waveform pattern up to the GSM or DCS bands, or to up-convert the waveform pattern to the GSM or DCS bands respectively.
  • the signal source 12 also includes a first filter 22 to filter out all out of band signals which are not on the frequency channel on which the telephone operates. These signals may have arisen from non-linearity in the mixer or up- converter 20.
  • a variable gain amplifier 24 is used to amplify the power of the signal outputted by the first filter 22.
  • the amplifier 24 is adjustable by means of a gain adjuster 26 to vary the power of the signal which in turn determines the size of the zone in which the telephone is disabled.
  • a second filter 28 is used to filter out unwanted harmonics caused by the amplifier 24 thereby outputting the interference signal 40.
  • the device 10 also includes transmitter means in- the form of an antenna 30 operable to transmit the interference signal 40 in the zone thereby to disable operation of the telephone.
  • Figures 2 and 3 show an interference signal 40, in the form of a pseudo- noise signal in one embodiment of the invention, in the time and frequency domains respectively.
  • the maximum pulse width 52 of the waveform segment 46 of the signal 40 and the period 50 of the signal 40 are both selectable whereas the rest of the waveform segment 46 is determined by an underlying deterministic process wherein the pulse sequence is known and generated by the pattern generator 18.
  • the amplitude generated by the pattern generator 18 is fixed.
  • Figures 4 and 5 show an interference signal 40, in the form of a pulse train signal in another embodiment of the invention, in the time and frequency domains respectively.
  • the interference signal 40 includes a waveform segment
  • the same waveform segment 44 is repeated after every period 50 of the interference signal 40, so that the carriers 42 are generated in the frequency domain without generating carriers on frequencies on which the telephone does not operate.
  • the period 50 of the interference signal 40 is selected to ensure that the carriers 42 of the interference signal 40 are frequencially spaced the same as the channels on which the cellular telephone operates.
  • the period 50 is selected at
  • the maximum pulse width 52 of the waveform segment 46 is selected to ensure that the bandwidth of the interference signal 40 is 200 MHz whichis more than the bandwidth in which the cellular telephone operates.
  • a cellular telephone within the zone will receive a telephone signal from a base station and the interference signal 40 from the cellular telephone disabling device 10.
  • the telephone will only be able to demodulate signals from the base station if the signals received from the base station are stronger than the interference signal received from the disabling device 10. Accordingly, the telephone will not be operable as long as it is located within the zone.
  • the fact that the signal transmitted by the base station may be on any one of the frequency channels on which the cellular telephone operates necessitates that all the frequency channels on which the cellular telephone operates be inhibited continuously.
  • a cellular telephone disabling device generates and transmits an interference signal so that carriers are generated continuously on every frequency channel on which a cellular telephone operates without generating carriers or noise on frequencies on which the telephone does not operate. This improves the efficiency of the device as opposed to when white noise or sweeping signals are used to disable a cellular telephone thereby removing the need for high-power output amplifiers. This also has the effect that little or no tuning of the device is required as the carriers are placed only on every frequency channel on which the cellular telephone operates.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Noise Elimination (AREA)

Abstract

The invention provides a cellular telephone disabling device (10) for disabling a cellular telephone in a particular zone. The device (10) includes a signal source (12) for generating a deterministic interference signal so that carriers are generated continuously on every frequency channel on which the cellular telephone operates. The telephone operates on frequencies spaced apart by fixed intervals. The device (10) also includes transmitter means in the form of an antenna (30) operable to transmit the interference signal in the zone thereby to disable operation of the telephone. The interference signal includes a waveform segment having at least one pulse over an interference signal period in the time domain. The same waveform segment is repeated after every period of the interference signal, so that the carriers are generated in the frequency domain without generating carriers on frequencies on which the telephone does not operate.

Description

METHOD AND APPARATUS OF DISABLING OPERATION OF A CELLULAR TELEPHONE IN CELLULAR COMMUNICATION SYSTEM
Field of the Invention
THIS INVENTION relates to cellular telephone communication. In particular it relates to a method of disabling operation of a cellular telephone in a particular zone, to a cellular telephone disabling device, and to a deterministic interference signal.
Background of the Invention
In South Africa the GSM and DCS cellular telephone communication networks operate on frequency channels which are spaced 200 kHz apart. In order to inhibit communication between a cellular telephone and a base station of the network, sufficient electromagnetic energy must be generated on each of these frequency channels. It is preferable that electromagnetic energy be generated continuously on each of these frequency channels and only on the frequency channels on which the networks operate.
Summary of the Invention
According to the invention, there is provided a method of disabling operation of a cellular telephone in a particular zone, the method including the following steps, in any order generating a deterministic interference signal so that carriers are generated continuously on every frequency channel on which the cellular telephone operates, wherein the telephone operates on frequency channels spaced apart by fixed intervals; and transmitting the interference signal in the zone thereby to inhibit communication between the cellular telephone and a base station. The interference signal may include a waveform segment having at least one pulse per interference signal period, wherein the same waveform segment is repeated after every period of the interference signal, so that the carriers are generated without generating carriers on frequencies on which the telephone does not operate.
The method may include the step of selecting the period of the
- interference signal to ensure that the carriers of the"interference~signal are frequencially spaced the same as the channels on which the cellular telephone operates. The period may be selected at 5 microseconds so that the carriers are spaced by 200 kHz.
The method may include the step of selecting a maximum pulse width of the interference signal to ensure that a bandwidth of the interference signal is at least the same as a bandwidth in which the cellular telephone operates. The maximum pulse width may be selected to ensure that the bandwidth of the interference signal is 200 MHz.
The interference signal may be a pseudo-noise signal wherein the maximum pulse width of the interference signal and the period of the interference signal are both selectable whereas the rest of the waveform segment is determined by an underlying deterministic process wherein the pulse sequence is known.
Further according to the invention, there is provided a cellular telephone disabling device for disabling a cellular telephone in a particular zone, the device including a signal source for generating a deterministic interference signal so that carriers are generated continuously on every frequency channel on which the cellular telephone operates, wherein the telephone operates on frequency channels spaced apart by fixed intervals; and transmitter means operable to transmit the interference signal in the zone thereby to disable operation of the telephone. The interference signal may include a waveform segment having at least one pulse per interference signal period, wherein the same waveform segment is repeated after every period of the interference signal, so that the carriers are generated without generating carriers on frequencies on which the telephone does not operate.
The period of the interference signal may be selected to ensure that the carriers of the interference signal are frequencially spaced the same as the channels on which the cellular telephone operates. The period may be 5 microseconds to ensure that the carriers are spaced by 200 kHz.
The maximum pulse width of the interference signal may be selected to ensure that a bandwidth of the interference signal is at least the same as a bandwidth in which the cellular telephone operates. The maximum pulse width may be selected to ensure that the bandwidth of the interference signal is 200 MHz.
The interference signal may be a pseudo-noise signal wherein the maximum pulse width of the interference signal and the period of the interference signal are both selectable whereas the rest of the waveform segment is determined by an underlying deterministic process wherein the pulse sequence is known.
Still further according to the invention, there is provided a deterministic interference signal which includes carriers on every frequency channel on which the cellular telephone operates, wherein the telephone operates on frequency channels spaced apart by fixed intervals.
The signal may include a waveform segment having at least one pulse per signal period, wherein the same waveform segment is repeated after every period of the signal, so that the carriers are generated without generating carriers on frequencies on which the telephone does not operate. The period of the signal may be selected to ensure that the carriers of the signal are frequencially spaced the same as the channels on which the cellular telephone operates. The period may be 5 microseconds to ensure that the carriers are spaced by 200 kHz.
The maximum pulse width of the signal may be selected to ensure that a bandwidth of the signal is-at least the same as a bandwidth in which the cellular telephone operates. The maximum pulse width may be selected to ensure that the bandwidth of the signal is 200 MHz.
The interference signal may be a pseudo-noise signal wherein the maximum pulse width of the interference signal and the period of the interference signal are both selectable whereas the rest of the waveform segment is determined by an underlying deterministic process wherein the pulse sequence is known.
Detailed Description of the Invention
The invention will now be described, by way of non-limiting example, with reference to the following drawings, in which
Figure 1 shows a block diagram of a cellular telephone disabling device in accordance with the invention;
Figures 2 and 3 show graphical representations of a pseudo-noise signal, in the time and frequency domains respectively, in accordance with the invention; and
Figures 4 and 5 show graphical representations of a pulse train signal, in the time and frequency domains respectively in accordance with the invention. In South Africa, telephones using the GSM or DCS networks operate at frequencies spaced by fixed intervals 44 of 200 kHz. The extended GSM band includes frequencies between 925 MHz and 960 MHz spaced by fixed intervals of 200 kHz and the DCS band includes frequencies between 1805 MHz and 1880 MHz spaced by fixed intervals of 200 kHz.
In the drawings, reference numeral 10 generally indicates a cellular telephone disabling device for disabling a cellular telephone in a particular zone. Typically, the device 10 is located within a bank or the like. The device 10 includes a signal source 12 for generating a deterministic interference signal 40 (shown in Figures 2 and 3) so that carriers 42 are generated continuously on every frequency channel on which the cellular telephone operates. The telephone operates on frequencies spaced apart by fixed intervals 44.
The signal source 12 includes a reference frequency generator 14 which generates a reference frequency which is in turn used to centre a carrier source at the centre of the GSM or DCS down-link channels. The signal source 12 also includes a carrier source generator in the form of a synthesised or PLL source 16 for generating the carrier source for accurate placement in either the GSM or DCS down-link channels.
The signal source 12 further includes a pattern generator 18 for generating a waveform pattern so that carriers 42 are spaced 200 kHz apart with a bandwidth of 200 MHz. A mixer or alternatively an up-converter 20 is used to mix the waveform pattern up to the GSM or DCS bands, or to up-convert the waveform pattern to the GSM or DCS bands respectively.
The signal source 12 also includes a first filter 22 to filter out all out of band signals which are not on the frequency channel on which the telephone operates. These signals may have arisen from non-linearity in the mixer or up- converter 20. A variable gain amplifier 24 is used to amplify the power of the signal outputted by the first filter 22. The amplifier 24 is adjustable by means of a gain adjuster 26 to vary the power of the signal which in turn determines the size of the zone in which the telephone is disabled. A second filter 28 is used to filter out unwanted harmonics caused by the amplifier 24 thereby outputting the interference signal 40.
The device 10 also includes transmitter means in- the form of an antenna 30 operable to transmit the interference signal 40 in the zone thereby to disable operation of the telephone.
Figures 2 and 3 show an interference signal 40, in the form of a pseudo- noise signal in one embodiment of the invention, in the time and frequency domains respectively. The maximum pulse width 52 of the waveform segment 46 of the signal 40 and the period 50 of the signal 40 are both selectable whereas the rest of the waveform segment 46 is determined by an underlying deterministic process wherein the pulse sequence is known and generated by the pattern generator 18. The amplitude generated by the pattern generator 18 is fixed.
Figures 4 and 5 show an interference signal 40, in the form of a pulse train signal in another embodiment of the invention, in the time and frequency domains respectively.
In Figures 2 to 5, the interference signal 40 includes a waveform segment
46 having at least one pulse 48 over an interference signal period 50 in the time domain. The same waveform segment 44 is repeated after every period 50 of the interference signal 40, so that the carriers 42 are generated in the frequency domain without generating carriers on frequencies on which the telephone does not operate. The period 50 of the interference signal 40 is selected to ensure that the carriers 42 of the interference signal 40 are frequencially spaced the same as the channels on which the cellular telephone operates. The period 50 is selected at
5 microseconds to ensure that the carriers 42 are spaced by fixed intervals 44 of 200 kHz.
The maximum pulse width 52 of the waveform segment 46 is selected to ensure that the bandwidth of the interference signal 40 is 200 MHz whichis more than the bandwidth in which the cellular telephone operates.
In use, a cellular telephone within the zone will receive a telephone signal from a base station and the interference signal 40 from the cellular telephone disabling device 10. The telephone will only be able to demodulate signals from the base station if the signals received from the base station are stronger than the interference signal received from the disabling device 10. Accordingly, the telephone will not be operable as long as it is located within the zone. The fact that the signal transmitted by the base station may be on any one of the frequency channels on which the cellular telephone operates necessitates that all the frequency channels on which the cellular telephone operates be inhibited continuously.
The Applicant believes it to be advantageous that a cellular telephone disabling device generates and transmits an interference signal so that carriers are generated continuously on every frequency channel on which a cellular telephone operates without generating carriers or noise on frequencies on which the telephone does not operate. This improves the efficiency of the device as opposed to when white noise or sweeping signals are used to disable a cellular telephone thereby removing the need for high-power output amplifiers. This also has the effect that little or no tuning of the device is required as the carriers are placed only on every frequency channel on which the cellular telephone operates.

Claims

Claims
1. A method of disabling operation of a cellular telephone in a particular zone, the method including the following steps, in any order generating a deterministic interference signal so that carriers are generated continuously on every frequency channel on which the cellular telephone operates, wherein the telephone operates on frequency channels -spaced apart by fixed intervals; and transmitting the interference signal in the zone thereby to inhibit communication between the cellular telephone and a base station.
2. A method as claimed in claim 1 , in which the interference signal includes a waveform segment having at least one pulse per interference signal period, wherein the same waveform segment is repeated after every period of the interference signal, so that the carriers are generated without generating carriers on frequencies on which the telephone does not operate.
3. A method as claimed in claim 2, which includes the step of selecting the period of the interference signal to ensure that the carriers of the interference signal are frequencially spaced the same as the channels on which the cellular telephone operates.
4. A method as claimed in claim 3, in which the period is selected at 5 microseconds so that the carriers are spaced by 200 kHz.
5. A method as claimed in any one of claims 2 to 4, which includes the step of selecting a maximum pulse width of the interference signal to ensure that a bandwidth of the interference signal is at least the same as a bandwidth in which the cellular telephone operates.
6. A method as claimed in claim 5, in which the maximum pulse width is selected to ensure that the bandwidth of the interference signal is 200 MHz.
7. A method as claimed in any one of claims 2 to 6, in which the interference signal is a pseudo-noise signal wherein the maximum pulse width of the interference signal and the period of the interference signal are both selectable whereas the rest of the waveform segment is determined by an underlying deterministic process wherein the pulse sequence is known.
8. A cellular telephone disabling device for disabling a cellular telephone in a particular zone, the device including a signal source for generating a deterministic interference signal so that carriers are generated continuously on every frequency channel on which the cellular telephone operates, wherein the telephone operates on frequency channels spaced apart by fixed intervals; and transmitter means operable to transmit the interference signal in the zone thereby to disable operation of the telephone.
9. A device as claimed in claim 8, in which the interference signal includes a waveform segment having at least one pulse per interference signal period, wherein the same waveform segment is repeated after every period of the interference signal, so that the carriers are generated without generating carriers on the frequencies on which the telephone does not operate.
10. A device as claimed in claim 9, in which the period of the interference signal is selected to ensure that the carriers of the interference signal are frequencially spaced the same as the channels on which the cellular telephone operates.
11. A device as claimed in claim 10, in which the period is 5 microseconds to ensure that the carriers are spaced by 200 kHz.
12. A device as claimed in any one of claims 9 to 11 , in which the maximum pulse width of the interference signal is selected to ensure that a bandwidth of the interference signal is at least the same as a bandwidth in which the cellular telephone operates.
13. A device as claimed in claim 12, in which the maximum pulse width is selected to ensure that the bandwidth of the interference signal is 200 MHz.
14. A device as claimed in any one of claims 9 to 13, in which the interference signal is a pseudo-noise signal wherein the maximum pulse width of the interference signal and the period of the interference signal are both selectable whereas the rest of the waveform segment is determined by an underlying deterministic process wherein the pulse sequence is known.
15. A deterministic interference signal which includes carriers on every frequency channel on which the cellular telephone operates, wherein the telephone operates on frequency channels spaced apart by fixed intervals.
16. A signal as claimed in claim 15, which includes a waveform segment having at least one pulse per signal period, wherein the same waveform segment is repeated after every period of the signal, so that the carriers are generated without generating carriers on the frequencies on which the telephone does not operate.
17. A signal as claimed in claim 16, in which the period of the signal is selected to ensure that the carriers of the signal are frequencially spaced the same as the channels on which the cellular telephone operates.
18. A signal as claimed in claim 17, in which the period may be 5 microseconds to ensure that the carriers are spaced by 200 kHz.
19. A signal as claimed in any one of claims 16 to 18, in which the maximum pulse width of the signal is selected to ensure that a bandwidth of the signal is at least the same as a bandwidth in which the cellular telephone operates.
20. A signal as claimed in claim 19, in which the maximum pulse width is selected to ensure that the bandwidth of the signal is 200 MHz.
21. A- signal as claimed in any one of claims 16- to -20 in-which^the interference signal is a pseudo-noise signal wherein the maximum pulse width of the interference signal and the period of the interference signal are both selectable whereas the rest of the waveform segment is determined by an underlying deterministic process wherein the pulse sequence is known.
22. A method, device, or signal according to the invention, as hereinbefore generally described.
23. A method, device, or signal as specifically described with reference to or as illustrated in the accompanying drawings.
24. A method, device, or signal including any new and inventive integer or combination of integers, substantially as hereinbefore described.
PCT/ZA2001/000070 2001-03-22 2001-05-29 Method and apparatus of disabling operation of a cellular telephone in a cellular communication system WO2002078384A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2001/2366 2001-03-22
ZA200102366 2001-03-22

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006107725A2 (en) * 2005-04-06 2006-10-12 Arinc, Inc. Connection inhibition apparatus and method
FR2885476A1 (en) * 2005-05-04 2006-11-10 France Telecom Communication e.g. emergency call, controlling system, for e.g. portable telephone, has unit transmitting communication transmitted or received by mobile terminal via one channel in communication zone and via another channel outside zone
EP1969750A1 (en) * 2005-12-22 2008-09-17 Telefonaktiebolaget LM Ericsson (publ) Jamming device for mobile communication
US9996079B2 (en) * 2016-09-19 2018-06-12 Citadel Defense Company Radio frequency device detection and intervention

Citations (4)

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Publication number Priority date Publication date Assignee Title
WO1998018232A1 (en) * 1996-10-23 1998-04-30 Deropa (Proprietary) Limited Cellular telephone jamming method and device
WO1998034412A2 (en) * 1997-02-03 1998-08-06 Yoav Geyra Consulting Ltd. Method and device for disabling cellular phones
WO2000030286A1 (en) * 1998-11-17 2000-05-25 Nomobile Sa Cellular telephone disabling device
US6195529B1 (en) * 1998-03-12 2001-02-27 Joachim Linz Transmission blocker for mobile radio stations and method for preventing transmission activities of a mobile radio station

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998018232A1 (en) * 1996-10-23 1998-04-30 Deropa (Proprietary) Limited Cellular telephone jamming method and device
WO1998034412A2 (en) * 1997-02-03 1998-08-06 Yoav Geyra Consulting Ltd. Method and device for disabling cellular phones
US6195529B1 (en) * 1998-03-12 2001-02-27 Joachim Linz Transmission blocker for mobile radio stations and method for preventing transmission activities of a mobile radio station
WO2000030286A1 (en) * 1998-11-17 2000-05-25 Nomobile Sa Cellular telephone disabling device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006107725A2 (en) * 2005-04-06 2006-10-12 Arinc, Inc. Connection inhibition apparatus and method
WO2006107725A3 (en) * 2005-04-06 2007-03-01 Arinc Inc Connection inhibition apparatus and method
US7937038B2 (en) 2005-04-06 2011-05-03 Aeromobile Communications Limited Connection inhibition apparatus and method
NO340887B1 (en) * 2005-04-06 2017-07-10 Aeromobile Ltd Device and method of connection prevention
FR2885476A1 (en) * 2005-05-04 2006-11-10 France Telecom Communication e.g. emergency call, controlling system, for e.g. portable telephone, has unit transmitting communication transmitted or received by mobile terminal via one channel in communication zone and via another channel outside zone
EP1969750A1 (en) * 2005-12-22 2008-09-17 Telefonaktiebolaget LM Ericsson (publ) Jamming device for mobile communication
EP1969750A4 (en) * 2005-12-22 2012-02-08 Ericsson Telefon Ab L M Jamming device for mobile communication
US9996079B2 (en) * 2016-09-19 2018-06-12 Citadel Defense Company Radio frequency device detection and intervention

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