FR2789539A1 - Mobile telephone location system having antenna station interface/ command unit with directive antenna same frequency telephone position detecting. - Google Patents

Abstract

The mobile telephone location system has an antenna station interface (e) and control unit (f) connected to a directive antenna (g) and base (h). The directive antenna locates the mobile telephone position using the same range of frequencies as is used for communications.

Description

RADIOTELEPHONE LOCATION TERMINALS

  Radiotelephone systems do not currently make it possible to accurately detect the presence of a radiotelephone in a determined place, nor to determine

its precise position.

  Knowledge of the presence in a cell is possible as well as cross-checking with the help of 2 or more transmitters, but this location, not very precise, does not make it possible to determine the presence of a mobile phone in a specific room, because it should also know the geographic coordinates of this room, which would be

heavy and expensive.

  The use of a GPS type means has the same drawback. Terminal systems that require modification of mobiles or special mobiles are not applicable

at the current park.

  The use of frequencies different from those used by operators present allocation problems

  of these frequencies (frequency saturation).

  Knowing the location of a mobile phone in a specific location is useful for several application areas: - location for security reasons

  (police, prisons, ...) for the use of the authorities.

  In addition, the identification of the mobile can be done

  through operator files.

  - localization with a view to filtering calls for reasons of comfort (silence, ...) for the use of

  responsible for the premises (without identification).

  The latter area is the subject of patents FR 97 07000,

FR 97 10105 and PCT FR 98/01109.

  The present invention widens the fields of use of the means defined in the patents mentioned and specifies

some common means.

  The present invention defines a system of location terminals usable with the current fleet of mobiles and defines the structure of the management software used.

by operators.

  The term "mobile" refers to a mobile radiotelephone. Localization can be carried out by a single terminal or

  by cross-checking between several terminals.

  These terminals have the function of sending signals

  for transmitters and the radiotelephony network.

  In addition, they can also send signals

  to the mobiles themselves depending on the type of application.

  The frequencies used are those assigned to operators. The principles of the present invention can be used for

  all radiotelephony systems with mobile receivers.

  The present invention describes the operating principles of these location terminals, as well as the radio means so that the accuracy of the location is sufficient, in particular for dissociating places.

  adjacent, without interference with unsupervised premises.

  The terminals will be fixed but may be mobile for

particular uses.

  Each terminal is identified by an alphanumeric code

  saved in his memory card (SIM card or equivalent).

  They can be integrated into local stations or

be autonomous.

  The detection is done thanks to the signals emitted by the mobile telephones: either at the time of the calls - or at precise passages - or at the time of the operations of assignment of a mobile to a cell The apparatus object of the present invention will include 2 antennas or means of communication: an antenna or means of detection and communication with the mobiles an antenna or a means of connection with the

transmitter or the global network.

  In this case, the connection is made by radio or by transmission by electric cables or

by optical fibers.

  The present invention uses several selective radio detection means for the precise location of the mobiles: - selective angle antennas, - close and distributed sensors, - radiating cables, - detection gates, - pre-existing cabling,

  - combinations of the above.

  The choice of means depends on the geometry of the room or place corresponding to the terminal. The choice is made

  to cover only the room to be monitored.

  The accuracy of the coverage is achieved by adjusting the sensitivity of the detection means according to the types

  partitions, by their position and orientation.

  In the event of detection, the terminal sends its personal code plus: - a signal indicating a detection in time, the network will be able to cross-check with the current link to determine the detected mobile. and / or the codes issued by the mobile or the transmitter

  for the purpose of possible identification.

  (repetition of detected signals with or without modifications). The operators' software will have to be adapted to ensure the link with the terminal and manage the identification or allow the filtering selectivity (emergency calls,

priority subscriptions, ...).

  Figure 1 shows the location of the different

- elements present.

  a: transmitter, earth or satellite base station, in connection with the data centers

radiotelephone treatment.

  4- b: terminal c: mobile radiotelephone 1: radio links between a and c when communicating, identifying or sending commands to the terminal, 2: detection of the mobile by the terminal,

  3: sending of the detection signal by b to a.

  FIG. 2 represents an architecture of the terminal: e: antenna for connection with the stations, - f: control unit, g: antenna for selective detection of the mobiles,

h: antenna support g.

  FIG. 3 defines the architecture of the management software used by the operators to decide the cut and / or

identify the mobile.

  The signal received from the terminal at the time of a call or assignment to a cell, triggers the decision program for the type of filtering for the mobile detected by

terminal.

  Comparison with the files of subscribers, special numbers (emergencies, ...) and terminals allows you to trigger the type of selective filtering or to decide on the type of service (restricted, ...). This comparison also allows

  identify the subscriber, if this function is requested.

  In the optional case of using detection gates, a file of the inputs and outputs of the room is

  held and allows to filter the corresponding calls.

  The present invention allows the localization and / or

  the identification of a mobile in a given place.

  This location is useful for surveillance services or for selective filtering operations

communications.

  Each terminal is used to process the different operators.

  These terminals are part of the radiocommunication network, are identified and serve as location relays

  to the radiotelephony network.

Claims (6)

  1- Devices making it possible to locate the mobile radiotelephones present in a given place characterized in that it consists of a radio detection organ for radiotelephones and a communication organ with the radiotelephony system, these radio communications using the same frequency range than that used for communications.   2- Apparatus according to claim 1 characterized in that the radio detection member is selective so as to   only monitor the location.   3- Apparatus according to claim 1 characterized in that the communication member with the system   radiotelephony consists of a radio antenna.   4- Apparatus according to claim 1 characterized in that the communication member with the radiotelephone system consists of electrical conductors or optical.   - Apparatus according to claims 2 characterized in   that the selective detection device consists of a selective angle antenna or consists of distributed sensors in the place to watch.   6- Apparatus according to claim 1 characterized in that the detection of radio waves emitted by the mobile is made at the start of a communication or or time of   the assignment of the mobile to a cell.   7- Apparatus according to claim 1 characterized in that the signals they send to the central radiotelephone system are processed by specific software which compares the information received with its database to identify the mobile or decide the interruption or the   modification of the communication mode.