EP1926242B1 - Method for detecting the use of radio frequency signal inhibitors in wireless communications systems - Google Patents

Method for detecting the use of radio frequency signal inhibitors in wireless communications systems Download PDF

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Publication number
EP1926242B1
EP1926242B1 EP07380325A EP07380325A EP1926242B1 EP 1926242 B1 EP1926242 B1 EP 1926242B1 EP 07380325 A EP07380325 A EP 07380325A EP 07380325 A EP07380325 A EP 07380325A EP 1926242 B1 EP1926242 B1 EP 1926242B1
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EP
European Patent Office
Prior art keywords
base station
frequency band
inhibitors
time period
wireless communications
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Legal status (The legal status 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 status listed.)
Not-in-force
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EP07380325A
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German (de)
French (fr)
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EP1926242A1 (en
Inventor
Guillermo Esteve Asensio
Antonio Mercadal Colom
Francisco Javier Rubio Andres
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Vodafone Espana SA
Vodafone Group PLC
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Vodafone Espana SA
Vodafone Group PLC
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Publication of EP1926242A1 publication Critical patent/EP1926242A1/en
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Publication of EP1926242B1 publication Critical patent/EP1926242B1/en
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    • 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
    • H04K3/88—Jamming or countermeasure characterized by its function related to allowing or preventing alarm transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • 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
    • 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

  • the present invention relates to a method detecting the blocking of alarm systems with inhibitors emitting in the frequencies used for the communication between the alarm and the base station of a wireless communications system. Said invention is therefore applicable to alert service and security systems used by security companies.
  • alarms There are currently a number of automated systems for detecting intrusion and emergency situations in buildings and private areas, hereinafter referred to as alarms. Some of these systems include the functionality of initiating a communication towards the party or parties interested in knowing the emergency situation or intrusion, either the owners or users of the building or an alarm center.
  • Knowing this alarm functionality when someone wants to enter without authorization an area in which there supposedly is an operating alarm, he or she can attempt to prevent the communications from the device towards the rest of the communication networks. To that end, he or she can physically cut the fixed transmission lines and/or use devices interfering or disabling the connection by means of radiofrequency waves.
  • the current solution consists of maintaining a constant communication or a communication every short time period with the alarm and considering that if the communication is interrupted, it is assumed that there is an emergency situation or intrusion.
  • This type of solution is described in document W02004028184 , disclosing a method whereby the mobile devices transmit signals regularly in order to detect a break in the communication. This practice involves a high cost because it requires constant communication between both ends, occupying a transmission resource constantly or at short time intervals in addition to negatively affecting the duration of the battery of the wireless device, and requires a modification in the device in order to carry out these regular communications.
  • Document EP1363421-A discloses a method for detecting the use of radiofrequency signal inhibitors in wireless communication systems, wherein the power levels received in several frequency bands are measured and wherein the baseline background noise is obtained from previous measurements.
  • the present invention solves the problem of detecting, in wireless communications systems, the break caused in the communication due to the use of radiofrequency signal inhibitors in the bands in which the system operates.
  • This invention solves said problem in an innovative manner that has never been considered before, improving the current methods in terms of used resources and response time because it does not regularly consume transmission over time and does not need modifications in the user devices.
  • the method object of the invention detects the blocking of alarm systems with inhibitors emitting in the frequencies used for the wireless communication between the alarm and the base stations.
  • the present invention relates to a method for detecting the use of radiofrequency signal inhibitors in wireless communications systems according to claim 1. Preferred embodiments of said method are defined in the dependent claims.
  • the inhibitors act to prevent the communication between at least one mobile device and a base station of the wireless communications system by means of emitting noise in at least one of the frequency bands used by the mobile device and the base station to communicate.
  • the data capture necessary for detecting inhibitors is carried out in said base station, whereas the detection itself is carried out in said base station or in other equipment, such as a server outside the base station, for example.
  • the method comprises the following steps:
  • the power level received in the base station in configurable time periods T is first measured in said frequency band ⁇ f, in order to thus obtain a track of the power level for said frequency band ⁇ f in time domains and which will be used as historical reference data.
  • the baseline background noise level R in said base station for said frequency band ⁇ f and optionally for different times of the day and of the year will subsequently be obtained from the previous measurements, because this background noise can depend on the time and on the season. In other words, the noise in time domains for said frequency ⁇ f is obtained to thus generate a record.
  • the mean power level P received in the base station in the frequency band ⁇ f is then measured in time periods ⁇ t, obtaining a value P i for each measurement carried out in each period ⁇ t i .
  • Each P i thus obtained is then related to a parameter N i , where N i is the average of the powers assigned to the connections set up in the frequency bands ⁇ f and within each time period ⁇ t i , obtaining pairs of data (P i ,N i ) for the frequency bands ⁇ f. It must be taken into account that when a connection is set up between the mobile device and the base station, the latter assigns to the mobile device the power that it must use to communicate and it is therefore not fixed for all the mobile devices.
  • a series of rules can be applied to this detection to determine the probability of certainty on such detection, which rules can be rules relating to the number of detections in a time period greater than ⁇ t, rules relating to detections in several frequencies or rules relating to the detection from several base stations, for example.
  • rules can be rules relating to the number of detections in a time period greater than ⁇ t, rules relating to detections in several frequencies or rules relating to the detection from several base stations, for example.
  • an alarm of the presence of interference or inhibitor can be generated.
  • Said alarm can be communicated to other entities, such as security companies for example, using suitable communication systems which cannot be affected by the detected signal inhibitors.
  • This method can be carried out for both the wireless link from the base station towards the user devices (downlink direction) and for those used in the reverse direction (uplink).
  • the base stations have suitable radiofrequency receivers for the uplink (communication of the mobile device towards the base station) frequency band, therefore the method object of the invention can be directly applied to detect the use of signal inhibitors in said uplink frequency band.
  • this method is to be applied to detect the use of inhibitors in the downlink (communication from the base station towards the mobile devices) frequency range
  • means for receiving radiofrequency in the downlink frequency band could be incorporated in the base station.
  • Figure 1 shows a generic wireless communications system, formed by a base station 1 and mobile devices 2, such as mobile telephones, personal digital assistants (PDAs) and wireless alarm systems.
  • the communication can be carried out in a GSM, UMTS, Wi-Fi system or any other wireless communications system.
  • any communications system there is a noise level R, as shown in Figure 2 (the x-axis represents the frequency whereas the y-axis represents the power), showing a graph in which the concept of background noise R and the transmission power of the mobile terminals of Figure 1 , in the frequency bands ⁇ f whereby they communicate with the base station 1, can be observed.
  • said communications system operates in the frequency band ⁇ f, a power outside said band ⁇ f, which is precisely the frequency-dependent background noise level R, is measured.
  • Figure 3 shows a wireless communications system in which a signal inhibitor 3 is acting, which inhibitor introduces a high noise level, an interference, normally in the frequency band ⁇ f used by the wireless communications system. This is observed in Figure 4 , showing a graph in which the power balance variation occurring when there is an inhibitor 3 in the area is observed.
  • the radiofrequency signal inhibitors 3 work by emitting an interfering signal in the same frequencies used by the wireless alarm systems 2 to communicate with the base station 1.
  • the base station 1 is designed to receive signals in the uplink direction (in the direction from the mobile devices 2 towards the base station 1) frequencies, it can therefore detect the use of said inhibitor 3 thanks to the method described below and act accordingly thereafter. It may be necessary to install additional measurement equipment in the base station 1 for the frequency band used in the downlink direction (in the direction from the base station 1 towards the mobile devices 2).
  • the method object of the invention consists of several steps.
  • the received power level in a frequency band ⁇ f of interest (normally the uplink direction frequency band) is first measured by the base station 1 in configurable time periods T, which can be of several minutes or even hours, for example, in order to obtain a signal and noise track in the time domains for said frequency band ⁇ f which can be stored for the purpose of having historical data, obtaining the baseline signal and background noise or R level data.
  • the received power level in the frequency band ⁇ f is measured in a similar manner in the base station 1 in time periods ⁇ t, as shown in Figure 5 (the x-axis represents the time variable whereas the y-axis represents the power), and it is related to the number of connections set up and to the power used by each connection, as in many wireless communications systems each connection has different power levels assigned at each time to minimize the emissions by both ends according to several parameters such as quality, transfer rate, etc.
  • the time periods ⁇ t can be as small as they are to be configured, minutes or even seconds, for example. Pairs of values are thus obtained which are related to the power P measured in the frequency band ⁇ f with the occupation, considered in terms of power, of the wireless link N.
  • the weighted number of connections according to the transfer rate as well as the transmission power required for each connection can be used as source data to obtain N.
  • P EXPi N i +R i , where P EXPi is the expected mean power for the time period ⁇ t i , N i is the average of the powers assigned to the connections set up within said certain time period ⁇ t i and R i is the noise considered to exist (normally stored in database record) for that time of the day in which the measurement is carried out.
  • Each measurement of the mean power level P i received in the base station 1 in each time period ⁇ t i is compared with the expected mean power P EXP .
  • the comparison allows knowing if the measured power level varies by a certain percentage or value with respect to the expected one according to the evaluated function, giving rise to a detection of the possible presence of interference or inhibitor 3.
  • the chosen value or percentage will determine the percentages of false alarm (an inhibitor 3 or interference is not present) and those of probability of detection (it is not detected even if it is present) with which the system will operate.
  • a series of rules can be applied to determine the probability of certainty on such detection, which rules can be rules relating to the number of detections in a time period greater than ⁇ t, rules relating to detections in several frequencies or rules relating to the detection from several base stations 1, for example.
  • rules can be rules relating to the number of detections in a time period greater than ⁇ t, rules relating to detections in several frequencies or rules relating to the detection from several base stations 1, for example.
  • the system can communicate it to other interested entities using the necessary communication systems.
  • Figure 5 shows a graph showing an example of the power measured during different times of the day, in which it is observed that the average background noise and powers can vary during different times of the day, the time of the day is therefore a parameter to be taken into account.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

    Field of the Invention
  • The present invention relates to a method detecting the blocking of alarm systems with inhibitors emitting in the frequencies used for the communication between the alarm and the base station of a wireless communications system. Said invention is therefore applicable to alert service and security systems used by security companies.
    • Background of the Invention
  • There are currently a number of automated systems for detecting intrusion and emergency situations in buildings and private areas, hereinafter referred to as alarms. Some of these systems include the functionality of initiating a communication towards the party or parties interested in knowing the emergency situation or intrusion, either the owners or users of the building or an alarm center.
  • Knowing this alarm functionality, when someone wants to enter without authorization an area in which there supposedly is an operating alarm, he or she can attempt to prevent the communications from the device towards the rest of the communication networks. To that end, he or she can physically cut the fixed transmission lines and/or use devices interfering or disabling the connection by means of radiofrequency waves.
  • The current solution consists of maintaining a constant communication or a communication every short time period with the alarm and considering that if the communication is interrupted, it is assumed that there is an emergency situation or intrusion. This type of solution is described in document W02004028184 , disclosing a method whereby the mobile devices transmit signals regularly in order to detect a break in the communication. This practice involves a high cost because it requires constant communication between both ends, occupying a transmission resource constantly or at short time intervals in addition to negatively affecting the duration of the battery of the wireless device, and requires a modification in the device in order to carry out these regular communications. Document US 5,687,217 discloses a method whereby wireless communications-receiving stations, also referred to as base stations, detect if there is any other base station that has stopped emitting or if the quality with which it does so has degraded, which differs from the object of the present patent, which consists of detecting elements that do not belong to the wireless communications system.
  • Document EP1363421-A discloses a method for detecting the use of radiofrequency signal inhibitors in wireless communication systems, wherein the power levels received in several frequency bands are measured and wherein the baseline background noise is obtained from previous measurements.
  • The present invention solves the problem of detecting, in wireless communications systems, the break caused in the communication due to the use of radiofrequency signal inhibitors in the bands in which the system operates. This invention solves said problem in an innovative manner that has never been considered before, improving the current methods in terms of used resources and response time because it does not regularly consume transmission over time and does not need modifications in the user devices. The method object of the invention detects the blocking of alarm systems with inhibitors emitting in the frequencies used for the wireless communication between the alarm and the base stations.
    • Description of the Invention
  • The present invention relates to a method for detecting the use of radiofrequency signal inhibitors in wireless communications systems according to claim 1. Preferred embodiments of said method are defined in the dependent claims.
  • The inhibitors act to prevent the communication between at least one mobile device and a base station of the wireless communications system by means of emitting noise in at least one of the frequency bands used by the mobile device and the base station to communicate. In the proposed method, the data capture necessary for detecting inhibitors is carried out in said base station, whereas the detection itself is carried out in said base station or in other equipment, such as a server outside the base station, for example. For each frequency band Δf in which the use of inhibitors is to be detected (the frequency band Δf will depend on each wireless communications system), the method comprises the following steps:
  • The power level received in the base station in configurable time periods T is first measured in said frequency band Δf, in order to thus obtain a track of the power level for said frequency band Δf in time domains and which will be used as historical reference data. The baseline background noise level R in said base station for said frequency band Δf and optionally for different times of the day and of the year will subsequently be obtained from the previous measurements, because this background noise can depend on the time and on the season. In other words, the noise in time domains for said frequency Δf is obtained to thus generate a record. Once this historical reference data has been obtained for different times of the day and year, it will initially be unnecessary to carry out more noise measurements in said time periods T, although it would be recommendable to carry out the measurements again from time to time to keep the historical reference data updated, because the external conditions of the noise can vary due to the action of new radiating external elements.
  • The mean power level P received in the base station in the frequency band Δf is then measured in time periods Δt, obtaining a value Pi for each measurement carried out in each period Δti.
  • Each Pi thus obtained is then related to a parameter Ni, where Ni is the average of the powers assigned to the connections set up in the frequency bands Δf and within each time period Δti, obtaining pairs of data (Pi,Ni) for the frequency bands Δf. It must be taken into account that when a connection is set up between the mobile device and the base station, the latter assigns to the mobile device the power that it must use to communicate and it is therefore not fixed for all the mobile devices.
  • A function PEXP=f(N) is then evaluated, which function relates the expected mean power PEXP, in the frequency bands Δf and in a certain time period Δt, to the average N of the powers assigned to the connections set up within said certain time period Δt. The steps of measuring values and evaluating functions PEXP=f(N) described up until now can be periodically repeated, because the propagation conditions and the noise level R vary over time and the obtained results can be incorporated to the historical data.
  • Finally, once the function PEXP=f(N) has been obtained for each measurement of the mean power level Pi received in the base station in each time period Δti, it is determined if said power level Pi exceeds the expected mean power PEXPI in the time period Δti, obtained according to the function PEXP=f(N), by a configurable percentage and/or by an also configurable predetermined value; in which case a detection of a possible use of signal inhibitors will occur.
  • A series of rules can be applied to this detection to determine the probability of certainty on such detection, which rules can be rules relating to the number of detections in a time period greater than Δt, rules relating to detections in several frequencies or rules relating to the detection from several base stations, for example. In the event that the probability of the use of signal inhibitors is considered sufficiently certain, an alarm of the presence of interference or inhibitor can be generated. Said alarm can be communicated to other entities, such as security companies for example, using suitable communication systems which cannot be affected by the detected signal inhibitors.
  • This method can be carried out for both the wireless link from the base station towards the user devices (downlink direction) and for those used in the reverse direction (uplink). The base stations have suitable radiofrequency receivers for the uplink (communication of the mobile device towards the base station) frequency band, therefore the method object of the invention can be directly applied to detect the use of signal inhibitors in said uplink frequency band. In the event that this method is to be applied to detect the use of inhibitors in the downlink (communication from the base station towards the mobile devices) frequency range, means for receiving radiofrequency in the downlink frequency band could be incorporated in the base station.
    • Brief Description of the Drawings
  • To better understand the invention, an embodiment of the invention is briefly described below as an illustrative and non-limiting example thereof. To that end, reference is made to the attached drawings, in which:
    • Figure 1 shows a generic wireless communications system.
    • Figure 2 shows a graph in which the concept of background noise R and transmission power of the mobile terminals of Figure 1 can be observed.
    • Figure 3 shows a wireless communications system in which a signal inhibitor is acting.
    • Figure 4 shows a graph in which the power balance variation occurring in the case of Figure 3 when there is an inhibitor in the area can be observed.
    • Figure 5 shows a graph showing an example of the power measured during different times of the day.
    Detailed Description of the Invention
  • Figure 1 shows a generic wireless communications system, formed by a base station 1 and mobile devices 2, such as mobile telephones, personal digital assistants (PDAs) and wireless alarm systems. The communication can be carried out in a GSM, UMTS, Wi-Fi system or any other wireless communications system. In any communications system there is a noise level R, as shown in Figure 2 (the x-axis represents the frequency whereas the y-axis represents the power), showing a graph in which the concept of background noise R and the transmission power of the mobile terminals of Figure 1, in the frequency bands Δf whereby they communicate with the base station 1, can be observed. Although said communications system operates in the frequency band Δf, a power outside said band Δf, which is precisely the frequency-dependent background noise level R, is measured.
  • Figure 3 shows a wireless communications system in which a signal inhibitor 3 is acting, which inhibitor introduces a high noise level, an interference, normally in the frequency band Δf used by the wireless communications system. This is observed in Figure 4, showing a graph in which the power balance variation occurring when there is an inhibitor 3 in the area is observed.
  • The radiofrequency signal inhibitors 3 work by emitting an interfering signal in the same frequencies used by the wireless alarm systems 2 to communicate with the base station 1. In the case of the wireless communications systems, the base station 1 is designed to receive signals in the uplink direction (in the direction from the mobile devices 2 towards the base station 1) frequencies, it can therefore detect the use of said inhibitor 3 thanks to the method described below and act accordingly thereafter. It may be necessary to install additional measurement equipment in the base station 1 for the frequency band used in the downlink direction (in the direction from the base station 1 towards the mobile devices 2).
  • The method object of the invention consists of several steps. The received power level in a frequency band Δf of interest (normally the uplink direction frequency band) is first measured by the base station 1 in configurable time periods T, which can be of several minutes or even hours, for example, in order to obtain a signal and noise track in the time domains for said frequency band Δf which can be stored for the purpose of having historical data, obtaining the baseline signal and background noise or R level data.
  • The received power level in the frequency band Δf is measured in a similar manner in the base station 1 in time periods Δt, as shown in Figure 5 (the x-axis represents the time variable whereas the y-axis represents the power), and it is related to the number of connections set up and to the power used by each connection, as in many wireless communications systems each connection has different power levels assigned at each time to minimize the emissions by both ends according to several parameters such as quality, transfer rate, etc. The time periods Δt can be as small as they are to be configured, minutes or even seconds, for example. Pairs of values are thus obtained which are related to the power P measured in the frequency band Δf with the occupation, considered in terms of power, of the wireless link N. The weighted number of connections according to the transfer rate as well as the transmission power required for each connection can be used as source data to obtain N. A function PEXP=f(N) is then evaluated, which function relates the expected mean power PEXP in the frequency bands Δf and in a certain time period Δt to the average N of the powers assigned to the connections set up within said certain time period Δt. The process described in the previous paragraphs for measuring values and evaluating functions must be carried out regularly given that the propagation conditions and the noise level R vary over time, the obtained functions being able to be stored for the purpose of having historical data. A possible function would be PEXPi=Ni+Ri, where PEXPi is the expected mean power for the time period Δti, Ni is the average of the powers assigned to the connections set up within said certain time period Δti and Ri is the noise considered to exist (normally stored in database record) for that time of the day in which the measurement is carried out.
  • Each measurement of the mean power level Pi received in the base station 1 in each time period Δti is compared with the expected mean power PEXP. The comparison allows knowing if the measured power level varies by a certain percentage or value with respect to the expected one according to the evaluated function, giving rise to a detection of the possible presence of interference or inhibitor 3. The chosen value or percentage will determine the percentages of false alarm (an inhibitor 3 or interference is not present) and those of probability of detection (it is not detected even if it is present) with which the system will operate.
  • A series of rules can be applied to determine the probability of certainty on such detection, which rules can be rules relating to the number of detections in a time period greater than Δt, rules relating to detections in several frequencies or rules relating to the detection from several base stations 1, for example. In the event that the probability of the use of signal inhibitors 3 is considered sufficiently certain according to the mentioned rules, an alarm of the presence of inhibitor 3 or interference can be generated.
  • Once the alarm has been detected, the system can communicate it to other interested entities using the necessary communication systems.
  • Figure 5 shows a graph showing an example of the power measured during different times of the day, in which it is observed that the average background noise and powers can vary during different times of the day, the time of the day is therefore a parameter to be taken into account.

Claims (4)

  1. A method for detecting the use of radiofrequency signal inhibitors in wireless communications systems, which inhibitors (3) act to prevent the communication between at least one mobile device (2) and a base station (1) of the wireless communications system by means of emitting noise in at least one of the frequency bands used by the mobile device (2) and the base station (1) to communicate, the method comprising, for each frequency band Δf in which the use of inhibitors (3) is to be detected, the following steps:
    a- measuring in said frequency band Δf the power level received in the base station (1) in configurable time periods T;
    b- obtaining from the previous measurements the baseline background noise level R in said base station (1) for said frequency band Δf ;
    c- measuring in time periods Δt the mean power level P received in the base station (1) in the frequency band Δf, obtaining a value Pi for each measurement carried out in each period Δti;
    characterized in that the data capture necessary for detecting the inhibitors (3) is carried out in said base station (1) and in that the method further comprises:
    d- relating each Pi obtained to a parameter Ni, where Ni is the average of the powers assigned to the connections set up in the frequency band Δf and within each time period Δti, obtaining pairs of data (Pi,Ni);
    e- evaluating a function PEXP=f(N) relating the expected mean power PEXP in a certain time period Δt to the average N of the powers assigned to the connections set up within said certain time period Δt;
    f- determining for each measurement of the mean power level Pi received in the base station (1) in each time period Δti if said power level Pi exceeds the expected mean power PEXPI in the time period Δti by a configurable percentage and/or by an also configurable predetermined value; in which case a detection of a use of signal inhibitors (3) will occur.
  2. A method according to the previous claim, wherein steps a) and e) of measuring values and evaluating functions PEXP=f(N) are periodically repeated.
  3. A method according to any of the previous claims, wherein once the use of signal inhibitors (3) has been detected, an alarm of the presence of inhibitor (3) is generated.
  4. A method according to any of the previous claims, wherein means for receiving radiofrequency in the downlink frequency band used by the base station (1) to communicate with the mobile devices (2) are incorporated to the base station (1) to be able to detect the use of inhibitors (3) in said downlink frequency band.
EP07380325A 2006-11-23 2007-11-22 Method for detecting the use of radio frequency signal inhibitors in wireless communications systems Not-in-force EP1926242B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES200602995A ES2321256B1 (en) 2006-11-23 2006-11-23 METHOD FOR DETECTING THE USE OF RADIO FREQUENCY SIGNAL INHIBITORS IN WIRELESS COMMUNICATIONS SYSTEMS.

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EP1926242A1 EP1926242A1 (en) 2008-05-28
EP1926242B1 true EP1926242B1 (en) 2012-05-30

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Publication number Priority date Publication date Assignee Title
ES2355347B1 (en) 2009-01-30 2012-02-10 Vodafone España, S.A.U. METHOD FOR DETECTING INTERFERENCES IN A WIRELESS COMMUNICATION SYSTEM.

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US5687217A (en) 1995-04-07 1997-11-11 Spectralink Corporation Listen verification method and system for cellular phones
CA2386709A1 (en) * 2002-05-17 2003-11-17 Boomerang Tracking Inc. Method and apparatus for detecting a radio wave jammer
CA2433242A1 (en) * 2002-07-03 2004-01-03 Newtrax Technologies Inc. Detector of commercial jammer
SE0202771L (en) 2002-09-17 2004-03-18 Multicom Security Ab Device for a mobile telephone system

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ES2321256A1 (en) 2009-06-03
ES2389002T3 (en) 2012-10-22
EP1926242A1 (en) 2008-05-28

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