Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
  • H04K3/00—Jamming of communication; Counter-measures
  • H04K3/20—Countermeasures against jamming
  • H04K3/22—Countermeasures against jamming including jamming detection and monitoring
  • H04K3/224—Countermeasures against jamming including jamming detection and monitoring with countermeasures at transmission and/or reception of the jammed signal, e.g. stopping operation of transmitter or receiver, nulling or enhancing transmitted power in direction of or at frequency of jammer
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
  • H04K3/00—Jamming of communication; Counter-measures
  • H04K3/60—Jamming involving special techniques
  • H04K3/68—Jamming involving special techniques using passive jamming, e.g. by shielding or reflection
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
  • H04K3/00—Jamming of communication; Counter-measures
  • H04K3/80—Jamming or countermeasure characterized by its function
  • H04K3/84—Jamming or countermeasure characterized by its function related to preventing electromagnetic interference in petrol station, hospital, plane or cinema
• • 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

• Radiotelephones allowing radiotelephones to manage filtering or interference.
• the present invention defines devices and procedures to be included in radiotelephones and their environment to enable them to respond properly to interference and filtering.
• Radiotelephones more and more widespread, have the disadvantage of creating noise pollution.
• FIG. 1 shows a local jamming / filtering system F which prevents the radiotelephone R from establishing a link with the transmitter S, and in particular from ringing, by means of an electromagnetic emission B which interferes with the normal link A or transmits signals (B, D) which modify the behavior of R or S.
• the present invention is represented by an addition of connections and software instructions in the radiotelephone R (see fig 2) to allow it to react correctly to interference, in particular, by warning the user of the existence of interference.
• the device R made inaccessible by jamming / filtering must, thanks to the present invention, detect a call or detect jamming and warn the user without circumventing the jamming, except in certain specific cases described below.
• the present invention also describes the associated means C which allow a controlled radio link to the radiotelephones present in a filtered area.
• This invention also allows the radiotelephone to dialogue with a jammer to provide detection functions, change of operating mode, to mitigate the drawbacks of the interference for itself or those outside the volume.
• R in the filtered zone, receives B and recognizes the filtering messages thanks to its characteristics: frequencies and / or contents of the filtering messages.
• the changeover to a "filtered" mode of the radiotelephone takes place after a certain delay after the reception of the first filtering message.
• This delay avoids the immediate switchover of a radiotelephone which has passed quickly into a filtered zone, especially if it was at the limit of the filtered zone and the interference emissions exceeded the strict limit of the volume to be protected.
• test If the test is positive, it warns the user after a certain delay (a few seconds or tens of seconds). This is the case of permanent interference. This time delay has 2 goals: to avoid an unblocking following the passage in a shadow zone for the interference waves, and to avoid an accumulation of rings at the exit of a scrambled zone.
• the present invention provides for the storage in memory of priority caller numbers or codes: gendarmeries, for example. If the filtered call corresponds to one of these numbers, the device, in the filtered area, will emit a specific signal (brief and discreet ringing or vibrations) which will prompt the user to leave the filtered area, possibly keeping in touch with the appellant thanks to a waiting message and with display on the screen. This option is facilitated with jamming devices F which establish a dialogue with the radiotelephone R or the station S at the time of the jamming.
• the numbers in memory will be of 2 types:
• the warning signal will be even more discreet, to keep priority on filtering the area and reducing noise pollution.
• a variant of the assembly of the invention described above uses the possibilities of the transmitting stations.
• the software associated with the transmitting stations can incorporate part of the logic functions described above.
• the transmitting station detects a scrambling code via the identified jammer or radiotelephone. In this case, it takes over for the management of filtered radiotelephones with procedures equivalent to those described above in the present invention.
• the variants of the present invention will be chosen according to the types of interference used (volumetric, detection at passages, permanent, intermittent, etc.) in accordance with the constraints of the operators.
• the use of a radiotelephone in "filtered" mode may be voluntary, outside a filtered area, by users who do not want to be disturbed but only warned. In this case, the return to normal mode is possible and triggered by the user.
• the "filtered” mode is therefore intermediate between the operating mode and the off mode, with 2 cases: voluntary or imposed.
• the present invention is therefore complementary to that of jammers and allows more flexible management of the filtering of radiotelephones in areas where their noise pollution is not desired.
• This filtering management will allow operators and manufacturers of radiotelephones to ultimately offer additional services to their customers.

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Electromagnetism (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Public Health (AREA)
• Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Radar, Positioning & Navigation (AREA)
• Remote Sensing (AREA)
• Mobile Radio Communication Systems (AREA)
• Telephone Function (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=9508909

Family Applications (1)

Country Status (5)

Families Citing this family (7)

Family Cites Families (9)

• 1997
  • 1997-07-01 FR FR9708546A patent/FR2765753B1/fr not_active Expired - Fee Related
• 1998
  • 1998-07-01 EP EP98935078A patent/EP1005729A1/de not_active Withdrawn
  • 1998-07-01 WO PCT/FR1998/001411 patent/WO1999001958A1/fr not_active Application Discontinuation
  • 1998-07-01 AU AU84454/98A patent/AU8445498A/en not_active Abandoned
  • 1998-07-01 US US09/462,055 patent/US6584319B1/en not_active Expired - Fee Related

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events