WO2000054538A1 - Apparatus for preventing the normal operation of a cellular mobile telephone - Google Patents

Apparatus for preventing the normal operation of a cellular mobile telephone Download PDF

Info

Publication number
WO2000054538A1
WO2000054538A1 PCT/GB2000/000857 GB0000857W WO0054538A1 WO 2000054538 A1 WO2000054538 A1 WO 2000054538A1 GB 0000857 W GB0000857 W GB 0000857W WO 0054538 A1 WO0054538 A1 WO 0054538A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency
predetermined
mobile telephone
sweep
cellular mobile
Prior art date
Application number
PCT/GB2000/000857
Other languages
French (fr)
Inventor
Simon Reza Saunders
Stavros Stavrou
Original Assignee
University Of Surrey
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 University Of Surrey filed Critical University Of Surrey
Priority to AU29319/00A priority Critical patent/AU2931900A/en
Publication of WO2000054538A1 publication Critical patent/WO2000054538A1/en

Links

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
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • 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
    • H04K3/43—Jamming having variable characteristics characterized by the control of the jamming power, signal-to-noise ratio or geographic coverage area
    • 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 apparatus for preventing the normal operation of a cellular
  • control means operable to cause the frequency of the signal generated by the
  • frequency generating means to sweep at a predetermined rate across a predetermined
  • telephones are used in areas such as restaurants, theatres, cinemas and trains.
  • the drawing shows a block diagram of apparatus suitable for preventing the normal
  • a triangular waveform generator 1 generates a
  • An amplitude control circuit 2 receives a
  • NCO voltage controlled oscillator
  • the output of the VCO 4 is fed via an RF attenuator 5 to an RF amplifier 6.
  • amplified signal is filtered by a bandpass filter 7 and then radiated via an antenna 8.
  • the antenna 8 may be selected to have a predetermined radiation pattern and this in
  • the waveform generator 1 may feed multiple transmitter chains 2',2",3',3" etc and this
  • the frequency radiated by the antenna 8 may be selected to block control channels of
  • the broadcast control channels a particular mobile telephony standard, for example, the broadcast control channels
  • a mobile telephone sweeps across a plurality
  • the signal transmitted from the antenna 8 may be substantially the same as the sweep rate
  • the apparatus of the invention may be any type of CDMA access (CDMA) communication schemes.
  • CDMA code division multiple access
  • the signal generated by the VCO 4 is typically confined substantially to a single
  • VCO 4 may cover a relatively narrow "block" of frequencies. It will be appreciated that a suitable choice of VCO 4 will allow one or more of the
  • the waveform generator 1 has been described as generating a triangular waveform.
  • the apparatus may also be used to prevent

Landscapes

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

Abstract

Apparatus for preventing the normal operation of a cellular mobile telephone comprising, frequency generating means (4) operable to generate an electrical signal at a predetermined frequency, sweep control means (1, 2, 3) operable to cause the frequency of the signal generated by the frequency generating means (4) to sweep at a predetermined rate across a predetermined bandwidth, amplifier means (6) for amplifying the electrical signal and antenna means (8) for receiving the output of the amplifier means (6) and for radiating the received signal.

Description

APPARATUS FOR PREVENTING THE NORMAL OPERATION OF A CELLULAR MOBILE TELEPHONE
This invention relates to apparatus for preventing the normal operation of a cellular
mobile telephone.
According to the present invention there is provided apparatus for preventing the
normal operation of a cellular mobile telephone comprising, frequency generating
means operable to generate an electrical signal at a predetermined frequency, sweep
control means operable to cause the frequency of the signal generated by the
frequency generating means to sweep at a predetermined rate across a predetermined
bandwidth and antenna means for receiving and radiating the output of the frequency
generating means.
Apparatus in accordance with the invention will now be described with reference to
the drawing which is a schematic block diagram of the apparatus.
It is desirable to prevent the operation of cellular mobile telephones in localised areas.
This may be done with the intention of reducing the annoyance caused when
telephones are used in areas such as restaurants, theatres, cinemas and trains.
The drawing shows a block diagram of apparatus suitable for preventing the normal
operation of mobile telephones operating under various standards such as GSM, EGSM, TACS, ETACS, DCS or UMTS and which is also suitable for manufacture
in a compact unit.
With reference to the drawing, a triangular waveform generator 1 generates a
waveform whose frequency is controllable. An amplitude control circuit 2 receives a
signal from the waveform generator and feeds this to a DC offset circuit 3 which adds
a selectable DC offset to the signal received from the amplitude control circuit 2. The
resulting signal is fed to a voltage controlled oscillator (NCO) 4. Thus the
combination of the components 1, 2, 3 and 4 enables the output of the NCO to be
swept at a predetermined rate through a predetermined range of frequencies having
a predetermined maximum and minimum frequency.
The output of the VCO 4 is fed via an RF attenuator 5 to an RF amplifier 6. The
amplified signal is filtered by a bandpass filter 7 and then radiated via an antenna 8.
The antenna 8 may be selected to have a predetermined radiation pattern and this in
conjunction with control of the radiated power using the attenuator 5 permits the range
over which the apparatus is effective to be selected, for example, to match the interior
dimensions of a train carriage.
The waveform generator 1 may feed multiple transmitter chains 2',2",3',3" etc and this
arrangement may be used to prevent normal operation of cellular mobile telephones which use different standards having different characteristics such as using different
portions of the available frequency spectrum.
The frequency radiated by the antenna 8 may be selected to block control channels of
a particular mobile telephony standard, for example, the broadcast control channels
(BCCH) of the GSM standard. By blocking the downlink control channels, the mobile
telephone is unable to logon to a local base station. The telephone is thus unable to
make or receive calls.
Typically during a logging on procedure, a mobile telephone sweeps across a plurality
of control channels. For optimal operation of the invention, the sweep rate of the
signal transmitted from the antenna 8 may be substantially the same as the sweep rate
employed by the mobile telephone across the control channels.
For mobile telephony standards such as UMTS which use code division multiple
access (CDMA) communication schemes, the apparatus of the invention may be
operated to sweep relatively quickly across a wide bandwidth thereby to generate a
broadband signal which prevents the operation of a UMTS-type telephone.
The signal generated by the VCO 4 is typically confined substantially to a single
frequency. However, by mixing the output of the VCO with noise, the signal which
is swept may cover a relatively narrow "block" of frequencies. It will be appreciated that a suitable choice of VCO 4 will allow one or more of the
attenuator 5, the amplifier 6 or the filter 7 to be omitted. This modification allows an
even more compact and cost effective apparatus to be manufactured.
The waveform generator 1 has been described as generating a triangular waveform.
However other waveforms may also be used.
By suitable choices of radiated frequencies, the apparatus may also be used to prevent
the normal operation of other RF wireless systems such as radio broadcasts, DECT or
television broadcasts.

Claims

1. Apparatus for preventing the normal operation of a cellular mobile telephone
comprising, frequency generating means operable to generate an electrical signal at
a predetermined frequency, sweep control means operable to cause the frequency of
the signal generated by the frequency generating means to sweep at a predetermined
rate across a predetermined bandwidth and antenna means for receiving and radiating
the output of the frequency generating means.
2. Apparatus according to claim 1 , wherein the said predetermined bandwidth
substantially overlaps the frequency spectrum used for one or more control channel
used for passing control information between the cellular mobile telephone and a
cellular base station.
3. Apparatus according to claim 1 or claim 2, wherein the predetermined sweep
rate is substantially the same as the rate at which the cellular mobile telephone sweeps
across control channels whilst attempting to logon to a cellular base station.
4. Apparatus according to any preceding claim, wherein the sweep control means
is arranged to cause a relatively fast sweep across a relatively wide spectrum such that
the antenna means radiates a relatively broadband signal, and wherein the bandwidth
of the broadband signal is selected substantially to cover the frequency spectrum used
by a cellular mobile telephone using a CDMA communication scheme.
5. Apparatus according to any preceding claim, wherein the frequency generating
means is a voltage controlled oscillator.
6. Apparatus according to claim 5, wherein the sweep control means includes a
waveform generator for generating a waveform, such as a triangular waveform, at a
predetermined and adjustable frequency, amplitude adjustment means for adjusting
the amplitude of the waveform generated by the waveform generator and DC offset
means for applying a DC offset to the waveform generated by the waveform
generator, the combination of the waveform generator, the amplitude adjustment
means and the DC offset means being operable to generate a wavefoπn which sweeps
at a predetermined rate between a predetermined minimum voltage and a
predetermined maximum voltage.
7. Apparatus according to any preceding claim including attenuator means for
adjusting the amplitude of the signal received by the antenna means whereby the
power radiated by the antenna may be adjusted.
8. Apparatus according to any preceding claim, including respective pluralities
of frequency generating and sweep control means, the apparatus being operable to
radiate in a plurality of discrete portions of the frequency spectrum.
9. Apparatus according to any preceding claim, including amplifier means operable to amplify the signal generated by the frequency generating means.
10. Apparatus according to any preceding claim, including filter means operable
to filter the signal generated by the frequency generating means.
1 1. Apparatus for preventing the normal operation of a cellular mobile telephone
constructed and arranged as described herein with reference to the drawings.
PCT/GB2000/000857 1999-03-11 2000-03-09 Apparatus for preventing the normal operation of a cellular mobile telephone WO2000054538A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU29319/00A AU2931900A (en) 1999-03-11 2000-03-09 Apparatus for preventing the normal operation of a cellular mobile telephone

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9905589.9A GB9905589D0 (en) 1999-03-11 1999-03-11 Apparatus for preventing the normal operation of a cellular mobile telephone
GB9905589.9 1999-03-11

Publications (1)

Publication Number Publication Date
WO2000054538A1 true WO2000054538A1 (en) 2000-09-14

Family

ID=10849414

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2000/000857 WO2000054538A1 (en) 1999-03-11 2000-03-09 Apparatus for preventing the normal operation of a cellular mobile telephone

Country Status (3)

Country Link
AU (1) AU2931900A (en)
GB (1) GB9905589D0 (en)
WO (1) WO2000054538A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2834151A1 (en) * 2001-12-21 2003-06-27 Vincent Bernatets Mobile phone radio inhibition system uses random low power carriers
FR2834838A1 (en) * 2002-01-15 2003-07-18 Herisse Pascal Dominique Le METHOD AND DEVICE FOR INHIBITING RADIOTELEPHONES AND THE LIKE
GB2425019A (en) * 2005-04-06 2006-10-11 Roke Manor Research Masking transmissions to inhibit call connection to external base stations
EP1969750A1 (en) * 2005-12-22 2008-09-17 Telefonaktiebolaget LM Ericsson (publ) Jamming device for mobile communication

Citations (3)

* 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
FR2764145A1 (en) * 1997-06-02 1998-12-04 Raoul Girod APPARATUS FOR FILTERING RADIOTELEPHONES

Patent Citations (3)

* 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
FR2764145A1 (en) * 1997-06-02 1998-12-04 Raoul Girod APPARATUS FOR FILTERING RADIOTELEPHONES

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2834151A1 (en) * 2001-12-21 2003-06-27 Vincent Bernatets Mobile phone radio inhibition system uses random low power carriers
WO2003055116A2 (en) * 2001-12-21 2003-07-03 Vincent Bernatets Method and device for inhibiting radio terminals, radiotelephones and the like
WO2003055116A3 (en) * 2001-12-21 2003-12-18 Vincent Bernatets Method and device for inhibiting radio terminals, radiotelephones and the like
FR2834838A1 (en) * 2002-01-15 2003-07-18 Herisse Pascal Dominique Le METHOD AND DEVICE FOR INHIBITING RADIOTELEPHONES AND THE LIKE
WO2003061321A2 (en) * 2002-01-15 2003-07-24 Pascal Dominique Le Herisse Method and device for inhibiting wireless telephones and similar devices
WO2003061321A3 (en) * 2002-01-15 2003-12-11 Herisse Pascal Dominique Le Method and device for inhibiting wireless telephones and similar devices
GB2425019A (en) * 2005-04-06 2006-10-11 Roke Manor Research Masking transmissions to inhibit call connection to external base stations
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
GB2425019B (en) * 2005-04-06 2009-09-23 Roke Manor Research 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
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

Also Published As

Publication number Publication date
GB9905589D0 (en) 1999-05-05
AU2931900A (en) 2000-09-28

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