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WO1998034412A2 - Method and device for disabling cellular phones - Google Patents

Method and device for disabling cellular phones Download PDF

Info

Publication number
WO1998034412A2
WO1998034412A2 PCT/IL1998/000049 IL9800049W WO9834412A2 WO 1998034412 A2 WO1998034412 A2 WO 1998034412A2 IL 9800049 W IL9800049 W IL 9800049W WO 9834412 A2 WO9834412 A2 WO 9834412A2
Authority
WO
WIPO (PCT)
Prior art keywords
confined area
jamming signal
power level
antenna
frequency
Prior art date
Application number
PCT/IL1998/000049
Other languages
French (fr)
Other versions
WO1998034412A3 (en
Inventor
Yoav Geyra
Original Assignee
Yoav Geyra Consulting Ltd.
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 Yoav Geyra Consulting Ltd. filed Critical Yoav Geyra Consulting Ltd.
Priority to AU57787/98A priority Critical patent/AU5778798A/en
Publication of WO1998034412A2 publication Critical patent/WO1998034412A2/en
Publication of WO1998034412A3 publication Critical patent/WO1998034412A3/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
    • 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
    • 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
    • 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
    • H04K3/45—Jamming having variable characteristics characterized by including monitoring of the target or target signal, e.g. in reactive jammers or follower jammers for example by means of an alternation of jamming phases and monitoring phases, called "look-through mode"

Definitions

  • the present invention relates to a method and also to a device for disabling the use of cellular phones within a predetermined confined area.
  • Cellular phones which have come into wide spread use, frequently
  • An object of the present invention is to provide a method, and also a device, for disabling the use of cellular phones within specified confined areas without depending on the user to turn-off the cellular phone.
  • the service band refers to a specific band of frequencies used by the
  • the service band can appear as any band in the cellular system. Sometimes on a separate channel and sometimes in a receptions channel. It is
  • the subscriber jointly used by all the cell sites in the network to inform a subscriber which speech channel is to receive the call.
  • the subscriber also uses the service band frequencies to indicate the ready status of the phone to receive a call, and to indicate the power of the signal in the respective cell site.
  • connection has been made in the restricted area, and will not interfere with telephone conversations that have already started to take place before the blocking device has been activated (in most cases). Accordingly, there will be
  • the power level of the jamming signal is from 0.5 to 10 milliwatts, preferably about 1.0 milliwatt. This value could also change in the future.
  • a small portable housing including a voltage controlled oscillator controlled to vary the frequency of a jamming signal; a low frequency oscillator
  • the foregoing method and device may be used for automatically disabling cellular phones within a confined
  • the disabling of the cellular phones is effected automatically and does not require any particular act by the carrier of the cellular phone.
  • FIG. 1 schematically illustrates a cellular phone and a device constructed in accordance with the present invention for disabling the use of such a cellular phone within a confined area;
  • Fig. 2 is a block diagram illustrating the electrical circuitry in one form of disabling device constructed in accordance with the present invention.
  • the cellular phone 2 illustrated in Fig. 1 is of a commonly-used type. It includes a small portable housing 3 having an ear piece 4 disposed in
  • a keyboard 6 containing depressable number and control
  • the broadcast band and the receiver band constitute most of the 800-960 MHz band width, with the service band being about 870-960 MHz.
  • the service band is about 870-960 MHz.
  • one system operates at 870-890 MHz, and another at 920-960 MHz.
  • Such cellular telephones generally transmit at power levels of about 600-700 milliwatts.
  • a device for disabling the use of a cellular phone within a
  • the confined area such as a room, hall, vehicle or the like.
  • the confined area such as a room, hall, vehicle or the like.
  • portable disabling device 10 is physically placed in the confined area to be neutralized. It continuously transmits a jamming signal continuously varying in frequency to cover the service band spectrum for the respective cellular sites, and of a power level to have a range sufficiently only for covering the respective confined area.
  • the frequency of the jamming signal is continuously varied in specific frequencies from about 800 to 980 MHz so as to cover the service band or the respective cell site.
  • the jamming signal is preferably about 0.5 to 10 milliwatts. This is usually
  • the power level of the jamming or disabling signal is about 1.0 milliwatts. This power level which is two or three orders of magnitude below the 600-700 milliwatts transmitted by the cellular telephones, would normally not require FCC approval nor is it likely to
  • the disabling device 10 illustrated in Fig. 1 includes a housing 11 which
  • the illustrated device includes an on/off switch 12, an LED indicator 13 indicating when the unit is operating, a manual range setting control 14 for setting the range of the device, a sweep frequency control 15 permitting manual setting of the lower frequency and the upper frequency of the jamming signal, and a manual control 16 for presetting the sweep frequency repetition rate of the jamming signal.
  • Unit 10 illustrated in Fig. 1 further includes a display 17 for displaying the
  • the signal strength of the cellular telephone system signal received in the respective area of the cell site depends on the location of the confined area to be neutralized, and also the prevailing weather
  • the jamming signal to assure that it is sufficient for disabling only the cellular phones in the respective confined area where the unit 10 is located.
  • disabling unit 10 includes a voltage controlled oscillator 20 which generates the jamming signal at a frequency controlled by a low frequency oscillator 21 , and a power amplifier 22 which amplifies the jamming signal and transmits it into the
  • the frequency of the jamming signal generated by the voltage controlled oscillator 20 is preset by the manual frequency setting 15, and the sweep frequency repetition rate is controlled by the low frequency
  • the transmitter jamming signal may be preset by manual control 14; alternatively, it may be automatically controlled by the signal strength detector 23 which detects and measures the signal strength of the cellular telephone system at the respective confined area, displays it in display 17, and automatically controls the power amplifier 22 via the range setting circuit 24. Since the signal strength detector 23 cannot operate at the same time that the disabling unit 10 transmits the jamming signal, detector 23 may be in the form of a separate unit providing a reading of the detected signal strength, enabling the user to manually preset the power setting (24) of the disabling unit. Disabling unit 10 is preferably in the form of a small, portable,
  • the disabling unit can be built in the form of a synthesized oscillator in which the frequencies are controlled by a crystal in a phased locket loop (PLL) system to prevent problems in manual adjustment of the frequency or in its stabilization with respect to time, temperature, different voltages, different
  • the system could use a programmable attenuator to

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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)

Abstract

A method of disabling the use of a cellular phone (2 or 3) within a confined area in a cell site, comprising transmitting within the confined area a jamming signal continuously varying in frequency to cover the service band for the respective cell site and of a power level to have a range sufficiently only for the respective confined area.

Description

METHOD AND DEVICE FOR DISABLING CELLULAR PHONES
The present invention relates to a method and also to a device for disabling the use of cellular phones within a predetermined confined area. Cellular phones, which have come into wide spread use, frequently
produce disturbances to those in the immediate vicinity. The use of cellular phones can even introduce a hazard, such as when used in the vicinity of electronic instrumentation at airports, hospitals, and the like. Many locations
therefore request that cellular phones not be used, or expressly ban their use.
Such a ban requires the user to turn-off his/her phone when entering such an
area, but users frequently neglect to do this. As a result, cellular phones
frequently create undesirable disturbances and even health hazards.
An object of the present invention is to provide a method, and also a device, for disabling the use of cellular phones within specified confined areas without depending on the user to turn-off the cellular phone.
According to one aspect of the present invention, there is provided a method for disabling the use of a cellular phone within a confined area in a cell
site, comprising transmitting within the confined area a jamming signal continuously varying in frequency to cover the service band for the respective
cell site and of a power level to have a range sufficiently only for the respective
confined area.
The service band refers to a specific band of frequencies used by the
cellular telephone system to locate a subscriber found in the cell site by sending its address. The service band can appear as any band in the cellular system. Sometimes on a separate channel and sometimes in a receptions channel. It is
jointly used by all the cell sites in the network to inform a subscriber which speech channel is to receive the call. The subscriber also uses the service band frequencies to indicate the ready status of the phone to receive a call, and to indicate the power of the signal in the respective cell site.
A number of important advantages are provided by jamming the service
frequency bands rather than the complete transmission band. Thus, since the power required for this purpose varies with the band width of the transmitted
signal, less power is needed to disable the cellular phones within a pre-determined confined area. This enables the disabling to be better restricted
to a specific confined area and without disturbing adjacent areas not intended to
be affected. In addition, the disabling will be effected only before a telephone
connection has been made in the restricted area, and will not interfere with telephone conversations that have already started to take place before the blocking device has been activated (in most cases). Accordingly, there will be
less chance that the device will interfere with transient persons traveling through
the restricted area.
According to further features in the described preferred embodiment the
frequency of the jamming signal is continuously varied in specific frequencies
from about 800 MHz to about 980 MHz. This frequency range of the jamming or disabling signal is presently the one used by cellular phone networks but this could change in the future. In addition, the power level of the jamming signal is from 0.5 to 10 milliwatts, preferably about 1.0 milliwatt. This value could also change in the future.
According to another aspect of the present invention, there is provided a
device for disabling the use of a cellular phone within a confined area in a cell
site, comprising a small portable housing including a voltage controlled oscillator controlled to vary the frequency of a jamming signal; a low frequency oscillator
controlling the voltage controlled oscillator to control the frequency repetition rate of the jamming signal; a power amplifier receiving the output of the voltage
controlled oscillator and amplifying the output to said power level of about 0.5 to
10 milliwatts; and an antenna receiving the output of the power amplifier and
transmitting the output to the respective confined area.
As will be described more particularly below, the foregoing method and device may be used for automatically disabling cellular phones within a confined
area, such as a meeting room, hall, vehicle, airport, hospital, etc., where their use may create undesirable disturbances or even dangerous hazards. The disabling of the cellular phones is effected automatically and does not require any particular act by the carrier of the cellular phone.
Further features and advantages of the present invention will be apparent
from the description below.
The invention is herein described by way of example only, with reference
to the accompanying drawings, wherein: Fig. 1 schematically illustrates a cellular phone and a device constructed in accordance with the present invention for disabling the use of such a cellular phone within a confined area; and
Fig. 2 is a block diagram illustrating the electrical circuitry in one form of disabling device constructed in accordance with the present invention.
The cellular phone 2 illustrated in Fig. 1 is of a commonly-used type. It includes a small portable housing 3 having an ear piece 4 disposed in
the upper end of the housing, a mouthpiece 5 pivotally mounted to the lower
end of the housing, a keyboard 6 containing depressable number and control
keys, a display 7, and an antenna 8. At the present time, such cellular phones generally operate in the frequency band of 800-960 MHz, but future networks
will probably work at higher frequencies, in the GHz spectrum. The broadcast band and the receiver band constitute most of the 800-960 MHz band width, with the service band being about 870-960 MHz. For example, one system operates at 870-890 MHz, and another at 920-960 MHz. Such cellular telephones generally transmit at power levels of about 600-700 milliwatts.
Since such cellular phones are well known, further details of their
construction and operation are not set forth herein.
In accordance with the present invention, a device, generally designated 10 in Fig. 1, is provided for disabling the use of a cellular phone within a
confined area, such as a room, hall, vehicle or the like. For this purpose, the
portable disabling device 10 is physically placed in the confined area to be neutralized. It continuously transmits a jamming signal continuously varying in frequency to cover the service band spectrum for the respective cellular sites, and of a power level to have a range sufficiently only for covering the respective confined area.
In the embodiment described herein, the frequency of the jamming signal is continuously varied in specific frequencies from about 800 to 980 MHz so as to cover the service band or the respective cell site. By thus covering the
complete service band all the cellular phones within that confined area will be
disabled since they will not have a service band available to them, and therefore will display a no service available message in display 7.
In the embodiment of the invention described below, the power level of
the jamming signal is preferably about 0.5 to 10 milliwatts. This is usually
sufficient to jam the confined area but not to disturb the use of cellular telephones outside the confined area. Preferably the power level of the jamming or disabling signal is about 1.0 milliwatts. This power level which is two or three orders of magnitude below the 600-700 milliwatts transmitted by the cellular telephones, would normally not require FCC approval nor is it likely to
produce hazards to instrumentations or controls that might be caused by the 600-700 milliwatt power level transmitted by cellular telephones.
The disabling device 10 illustrated in Fig. 1 includes a housing 11 which
encloses the electrical circuitry described below illustrated in Fig. 2. The
illustrated device includes an on/off switch 12, an LED indicator 13 indicating when the unit is operating, a manual range setting control 14 for setting the range of the device, a sweep frequency control 15 permitting manual setting of the lower frequency and the upper frequency of the jamming signal, and a manual control 16 for presetting the sweep frequency repetition rate of the jamming signal.
Unit 10 illustrated in Fig. 1 further includes a display 17 for displaying the
signal strength of the cellular telephone system signal received in the respective area of the cell site. The power level of such a signal depends on the location of the confined area to be neutralized, and also the prevailing weather
conditions. It determines the range setting 14, which setting controls the power
of the jamming signal to assure that it is sufficient for disabling only the cellular phones in the respective confined area where the unit 10 is located.
As shown in Fig. 2, the electronic circuitry within housing 11 of the
disabling unit 10 includes a voltage controlled oscillator 20 which generates the jamming signal at a frequency controlled by a low frequency oscillator 21 , and a power amplifier 22 which amplifies the jamming signal and transmits it into the
confined area via antenna 18. The frequency of the jamming signal generated by the voltage controlled oscillator 20 is preset by the manual frequency setting 15, and the sweep frequency repetition rate is controlled by the low frequency
oscillator 21 as preset by the sweep rate setting 16. The output power or range
of the transmitter jamming signal may be preset by manual control 14; alternatively, it may be automatically controlled by the signal strength detector 23 which detects and measures the signal strength of the cellular telephone system at the respective confined area, displays it in display 17, and automatically controls the power amplifier 22 via the range setting circuit 24. Since the signal strength detector 23 cannot operate at the same time that the disabling unit 10 transmits the jamming signal, detector 23 may be in the form of a separate unit providing a reading of the detected signal strength, enabling the user to manually preset the power setting (24) of the disabling unit. Disabling unit 10 is preferably in the form of a small, portable,
self-contained unit. Accordingly, it includes its own battery power supply 25 for
supplying the power to the above-described circuit components via the on/off switch 12 and the LED indicator 13. It will be appreciated that the various controls illustrated in the unit of Fig. 1 are shown for purposes of example only, and that some of these controls could be
pre-set at the factory, could be omitted, and/or other controls could be included. Also, the disabling unit can be built in the form of a synthesized oscillator in which the frequencies are controlled by a crystal in a phased locket loop (PLL) system to prevent problems in manual adjustment of the frequency or in its stabilization with respect to time, temperature, different voltages, different
antenna loads, etc. Also, the system could use a programmable attenuator to
control the range instead of a programmed amplifier.
Therefore, while the invention has been described with respect to one preferred embodiment, it will be appreciated that this is set forth merely for purposes of example, and that many other variations, modifications and
applications of the invention may be made.

Claims

What is claimed is:
1. A method of disabling the use of a cellular phone within a confined area in a cell site, comprising:
transmitting within said confined area a jamming signal continuously varying in frequency to cover the service band for the respective
cell site and of a power level to have a range sufficiently only for the respective
confined area.
2. The method according to Claim 1 , wherein the frequency of said jamming signal is continuously varied in specific frequencies from about 800
MHz to about 980 MHz.
3. The method according to either of Claims 1 or 2, wherein the power level of the jamming signal is from 0.5 to 10 milliwatts.
4. The method according to Claim 3, wherein the power level of the
jamming signal is about 1.0 milliwatts.
5. The method according to any one of Claims 1-4, wherein the cellular phone system signal level at the respective confined area is first
measured, and that measurement is used to preset the power level of
transmission of the jamming signal so that its range is sufficiently only for the
respective confined area.
6. The method according to Claim 5, wherein said measured signal level is displayed to enable the user to preset said power level.
7. The method according to Claim 5, wherein said measured signal level is used to automatically preset said power level.
8. The method according to any one of Claims 1-7, wherein said
confined area is a room.
9. The method according to any one of Claims 1-7, wherein said confined area is a hall.
10. The method according to any one of Claims 1-7, wherein said
confined area is a vehicle.
11. The method according to any one of Claims 1-10, wherein said jamming signal is transmitted by a small portable unit placed in said confined
area.
12. The method according to Claim 11 , wherein said small portable
unit includes: a voltage controlled oscillator controlled to sweep the frequency of
the jamming signal; a low frequency oscillator controlling the voltage controlled
oscillator to control the sweep frequency repetition rate of the jamming signal; a power amplifier receiving the output of the voltage controlled oscillator for amplifying the output to said power level of the jamming signal; and an antenna receiving the output of the power amplifier and
transmitting said output to the respective confined area.
13. The method according to Claim 12, wherein said antenna is an omnidirectional antenna and is placed in the middle of the confined area.
14. The method according to Claim 12, wherein said antenna is a directional antenna and is placed at one end of the confined area.
15. A device for disabling the use of a cellular phone within a confined area in a cell site, comprising:
a small portable housing including:
a voltage controlled oscillator controlled to vary the frequency of a
jamming signal; a low frequency oscillator controlling the voltage controlled oscillator to control the sweep repetition rate of the jamming signal;
a power amplifier receiving the output of the voltage controlled oscillator and amplifying the output to a power level of about 0.5 to 10
milliwatts; and an antenna receiving the output of the power amplifier and
transmitting said output to the respective confined area.
16. The device according to Claim 15, wherein said voltage controlled
oscillator is continuously varied to sweep specific frequencies from about 800 MHz to about 980 MHz.
17. The device according to either of Claims 15 or 16, wherein the
power level of the jamming signal is about 1.0 milliwatts.
18. The device according to any one of Claims 15-17, wherein said power amplifier includes a control for pre-setting the power level of the jamming signal.
19. The device according to Claim 18, wherein said control includes a presettable manual control.
20. The device according to either of Claims 18 or 19, wherein said
control includes a detector for detecting and measuring the signal level received at the respective cell site, and a control circuit for automatically controlling said power amplifier in accordance with said measured signal level.
21. The device according to any one of Claims 15-20, wherein said
voltage controlled oscillator includes a manual control for pre-setting the sweep
frequency of the jamming signal.
22. The device according to any one of Claims 15-21 , wherein said low frequency oscillator includes a manual control for pre-setting the sweep
repetition rate of the jamming signal.
23. The device according to any one of Claims 15-22, wherein said antenna is an omnidirectional antenna.
24. The device according to any one of Claims 15-22, wherein said antenna is a directional antenna.
PCT/IL1998/000049 1997-02-03 1998-02-02 Method and device for disabling cellular phones WO1998034412A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU57787/98A AU5778798A (en) 1997-02-03 1998-02-02 Method and device for disabling cellular phones

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL12013497A IL120134A0 (en) 1997-02-03 1997-02-03 Apparatus and method for activating cellular phones
IL120134 1997-02-03

Publications (2)

Publication Number Publication Date
WO1998034412A2 true WO1998034412A2 (en) 1998-08-06
WO1998034412A3 WO1998034412A3 (en) 1998-12-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL1998/000049 WO1998034412A2 (en) 1997-02-03 1998-02-02 Method and device for disabling cellular phones

Country Status (3)

Country Link
AU (1) AU5778798A (en)
IL (1) IL120134A0 (en)
WO (1) WO1998034412A2 (en)

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