Telecommunications – Interference signal transmission
Reexamination Certificate
1998-03-12
2001-02-27
Urban, Edward F. (Department: 2746)
Telecommunications
Interference signal transmission
C455S103000, C342S014000
Reexamination Certificate
active
06195529
ABSTRACT:
The invention relates to a method for preventing transmission activities of a mobile radio station, especially a mobile telephone in a mobile radio system with a mobile radio network and with fixed base stations, with the base station transmitting signals into the mobile radio network as synchronization information with a basic power and the mobile radio station receiving the signals with a receiving power that is reduced by the interference power present in the mobile radio network, and the mobile radio station being able to transmit only when it receives a signal with a receiving power that exceeds a predetermined threshold value.
The invention also relates to a transmission blocker to prevent transmission activities of a mobile radio station when working the method.
Transmission blockers for mobile radio stations, such as mobile telephones for example, to prevent transmission activities or to block them have not been known previously.
In areas with safety-relevant electronic devices, a transmitting mobile telephone can cause interference that can result in danger. At the present time, attention is directed to such danger by spoken or written warnings on the spot, given by stewardesses aboard aircraft for example.
The holders or users of mobile telephones, such as cell phones, usually cannot be recognized as such. The persons responsible for safety, at airports, aboard aircraft, etc. for example, must therefore depend on the potential users understanding these warnings and behaving in a responsible way by switching off their mobile telephones. This solution results in uncertain situations and is therefore unsatisfactory.
The goal of the invention is to prevent mobile radio stations such as mobile telephones that function according to known principles, from transmitting in order thus to reduce the danger of safety-relevant interference without the cooperation of the owner or potential user, especially in protected areas PA limited in space and time.
This goal is achieved by a method according to the invention according to claim
1
as well as a device designed in accordance with claim
1
and termed a transmission blocker.
Advantageous embodiments of the method and the transmission blocker can be found in the characterizing features of the subclaims.
The method according to the invention for preventing transmissions by mobile telephones with limitations in space and time or for interrupting the transmission of mobile telephones is therefore characterized by the fact that an interference signal with an interference signal power is generated in the mobile radio network, with the interference signal power being chosen to be large enough that the signal that is radiated at the basic power by the base radio station, upon receipt by the mobile radio station, no longer exceeds the threshold value of the receiving power. In addition, the invention proposes a device for working the method. The device is termed a transmission blocker. The transmission blocker according to the invention is characterized by the fact that it comprises devices for generating and transmitting radio signals as interference signals in the frequency range of the relevant corresponding mobile radio network to prevent transmission activities of a mobile radio station, especially a mobile telephone, in a mobile radio station with a mobile radio network and with fixed base radio stations, with the base radio stations transmitting signals (S) as synchronization information for receipt by the mobile radio station in order to permit the mobile radio station to transmit, in such fashion that synchronization of the mobile radio station with a base radio station by means of the signal transmitted by the mobile radio station to be received by the base radio station and/or a decoding of the signals transmitted by the base radio station by the mobile radio station and/or a recognition of the signals emitted by the base radio station by the mobile radio station is preventable in a protected area defined by the interference signals, their interference signal power, and the transmission duration of the interference signals.
The method according to the invention and a transmission blocker according to the invention that operates according to the method have the following features:
1. The transmission blocker transmits radio signals as interference signals that prevent the mobile telephone from synchronizing with the so-called base radio station or Ifrom decoding the signals emitted by a signaling channel of the base radio station as synchronization information, or generally recognizing the relevant signals from the mobile radio network.
2. The transmission blocker prevents transmission on all mobile radio stations that can make transmission contact with the base radio stations only when the relevant signals that serve as synchronization information from the base radio station are received and have been recognized perfectly by the mobile radio station.
3. The transmission blocker uses an interference signal which, owing to its nature and strength, has no negative influences on the safety-relevant electronic devices present in the area to be protected PA.
4. The transmission blocker can be adjusted so that it does not have a disturbing effect on radio networks outside the protected area PA within which it is employed.
5. Optionally, the transmission blocker can be provided with equipment that limits its influence to the mobile radio systems that supply the protected area in question, GSM or CDMA for example.
6. Optionally, the transmission blocker can be provided with equipment that enables it to measure the prevailing levels of the existing mobile radio networks and to create an optimum interference level by means of a corresponding interference signal SS with an interference signal power PSS that is sufficient to prevent the mobile radio stations, like the mobile telephones, from transmitting.
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Baumle Regina
Linz Joachim
Antonelli Terry Stout & Kraus LLP
Jackson Blane J.
Urban Edward F.
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