EP2632068A1 - Procédé de détection d'un émetteur parasite affectant un équipement d'utilisateur de communication et système, équipement d'utilisateur et module de communication - Google Patents

Procédé de détection d'un émetteur parasite affectant un équipement d'utilisateur de communication et système, équipement d'utilisateur et module de communication Download PDF

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Publication number
EP2632068A1
EP2632068A1 EP12156957.8A EP12156957A EP2632068A1 EP 2632068 A1 EP2632068 A1 EP 2632068A1 EP 12156957 A EP12156957 A EP 12156957A EP 2632068 A1 EP2632068 A1 EP 2632068A1
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EP
European Patent Office
Prior art keywords
radiolink
power indicator
user equipment
communication
jamming
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Granted
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EP12156957.8A
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German (de)
English (en)
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EP2632068B1 (fr
Inventor
Volker Breuer
Bernd Röhl
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Thales DIS AIS Deutschland GmbH
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Gemalto M2M GmbH
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Priority to EP12156957.8A priority Critical patent/EP2632068B1/fr
Priority to CN201310131760.1A priority patent/CN103441804B/zh
Publication of EP2632068A1 publication Critical patent/EP2632068A1/fr
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    • 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
    • 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
    • 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
    • H04K3/20—Countermeasures against jamming
    • H04K3/22—Countermeasures against jamming including jamming detection and monitoring
    • H04K3/222—Countermeasures against jamming including jamming detection and monitoring wherein jamming detection includes detecting the absence or impossibility of intelligible communication on at least one channel

Definitions

  • a present invention relates to a method of detecting a jamming transmitter affecting a communication user equipment, wherein a set communication user equipment is adapted for a communication with a component of the radio network having a number of user equipments and a number of base stations.
  • the invention also relates to a communication module for a user equipment adapted to execute the method of detecting a user equipment and a jamming transmitter affecting the communication user equipment.
  • the invention also relates to a system comprising the module and an application layer.
  • Contemporary, cellular radio networks are known since many years now meanwhile based on different technologies.
  • the broadcast carrier still is held by the global system for mobile communications according to the so called GSM standard.
  • An user equipment in such cellular network can move freely and may be handed over to various cells of the radio networks as e. g. described in GSM standards specification 3GPP ETSI TS51.010 or the like.
  • CDMA code division multiple access
  • UMTS universal mobile telecommunication system
  • a user equipment in radio networks can be subject of being affected by a jamming transmitter - jamming in this context generally is performed by an instrument preventing a user equipment from receiving signals from its base station.
  • the jammer effectively disables cellular phones mostly by broad frequency interference with communication frequencies of the user equipment at high power level.
  • some jammer applications are meant to be legal for instances in places where phone call is to be suppressed due to silence conditions.
  • Other jammers are applied during misuse for instances to interrupt security applications of user equipment or the like. Jammers are available for jamming GSM and also UMTS frequencies.
  • a method for jamming detection in a GSM mobile telecommunications network comprising the steps of, at a user equipment registered with the mobile telecommunications network: a) measuring a signal power level in at least one of a plurality of communication channels between the user equipment and a base station within a band of operation of the mobile telecommunications network; b) checking whether the signal power level in said at least one communication channel is greater than a threshold MNPL and, if so, attempting to decode a Base Station Identity Code BSIC broadcast by the base station in said communication channel; c) repeating steps a) and b) for a certain number of channels; d) signaling a jammed condition report JDR message to the base station if said BSIC cannot be decoded for said number DCMN of channels.
  • This method suffers from the fact that usually a signaling of a jammed condition report JDR message to the base station is not possible due to the jammed condition; thus the jammed condition remains unanswered.
  • a further anti-jamming solution is known from WO 2007/019814 which is restricted to the GSM standard.
  • a method for detecting a jamming transmitter affecting a communication terminal is described wherein receipt radio-channel signal levels are evaluated at periodic intervals on a signaling channel.
  • the communication terminal detects a radio-channel signal level that exceeds a predefined threshold value in the signaling channel but is nevertheless unable to decode a message content of a message, then this state is interpreted as an interference state and an alarm signal is emitted.
  • An idle mode of a user equipment according to the GSM standard is e. g. described in 3GPP ETSI TS 45.008.
  • the above jamming approaches have the aim to detect a jamming situation only in the idle mode. It is known for instance from technical specification 3GPP ETSI TS23.022 that the idle mode still preserves certain operations as the user equipment is still registered in the radio network, that is when the user equipment (also referred to as a mobile station MS) is switched on but has no dedicated channel allocated. Thus, the mobile station is not able to make or receive a call.
  • the object of which is to provide an improved method of detecting a jamming transmitter affecting a communication user equipment.
  • a further object of the invention is to provide an improved communication module, in particular user equipment, adapted to execute the method of detecting a jamming transmitter affecting the communication user equipment, in particular to detect the jamming situation already whilst the communication user equipment is in a connected mode; preferably before the connection breaks down.
  • the method and the communication module shall be adapted to detect a jamming warning before a jammed situation is to be accepted; in particular it shall be discriminated between an out of service state of the user equipment and a jamming warning situation.
  • the object is achieved by the method of the invention as claimed in claim 1.
  • the method and developed configurations thereof as outlined above may be implemented by digital circuits of any preferred kind, whereby the advantages associated with the digital circuits may be obtained.
  • one or more method steps and/or features of the method can be implemented by one or more means for functionally executing the method step.
  • a single processor or other unit may fulfill the functions of several means recited in the claims - this in particular holds for user equipment according to the concept of the invention.
  • the invention also leads to a system of a communication module and an application layer, in particular an user equipment, as claimed in claim 16.
  • the invention also leads to a communication module as claimed in claim 17.
  • said communication user equipment and a number of base stations are components of a radio network, in particular based on a cellular global system for mobile communications (GSM).
  • GSM global system for mobile communications
  • the invention starts from the consideration that instant approaches for detecting a jamming situation are based on measurements at a mobile station (user equipment UE) in the idle mode.
  • the instant invention recognized that nevertheless it is also possible to find sufficient indication for a jamming situation when the user equipment is in a connected mode of a communication radiolink to a component of the radio network; thus wherein during the connected mode the user equipment has a dedicated channel allocated. So to say, the instant invention starts from the recognition that a jamming detection already is possible in a status where the mobile station has a dedicated channel allocated; thus is able to make or receive a call.
  • this approach allows for detecting a jamming attack even during a call or connection, i. e. an in-call/connection jamming detection concept is provided.
  • the method is characterized by providing the user equipment in a connected mode of a communication radiolink to a component of the radio network. More precisely, the method provides a basis to observe the impact of the jammer, respectively jamming power, on an existing radiolink.
  • the user-equipment indeed can be in an active-status, i. e. is switched on. Consequently, the method preferably further is characterized by providing the user equipment in an active-status, respectively switched on.
  • the method according to the invention provides the steps as further defined in claim 1; in short terms:
  • the first power indicator is set before the second power indicator, in particular before evaluating whether the communication radiolink is affected by a radiolink error. Nevertheless, it can be useful also to set the first power indicator even during evaluating whether the communication radiolink is affected by a radiolink error as soon as it can be assumed that the first power indicator somewhat reflects a situation wherein the user equipment is not totally blocked by a jamming transmitter.
  • an early power indicator can be set by measuring an early power indicator, in particular at a first time (t1), indicative of a received radio signal strength.
  • a power indicator indicative of a received radio signal strength, in particular over the used radiofrequency of the communication user equipment (UE) is determined in a state of the user equipment which can be assumed to be undisturbed.
  • the communication user equipment is assumed to be undisturbed, in the case a radiolink-timeout counter or another scoring counter has a value above an upper threshold value, which is below a maximum value.
  • the power indicator at this --in particular early-- point of first time is stored or held in a similar way. Further firstly it is evaluated whether the communication radiolink is affected by a radiolink error.
  • a radiolink error is assumed to enclose any kind of disturbance of the radiolink which can be measured or determined actually.
  • the first time is before a radiolink evaluation and the second time is during or after the radiolink error identification, and wherein in case of the radiolink error identification the early power indicator determined at the first time before the radiolink error identification is compared to the later power indicator determined at the second time after the radiolink error identification.
  • a situation during the radiolink error identification e.g. can be assumed in the case the radiolink-timeout counter or another scoring counter has a value below an upper threshold value, in particular which is below a lower threshold value.
  • an early power indicator determined at a first time before the radiolink error identification is compared to a later power indicator determined at a second time after the radiolink error identification.
  • the later power indicator determined at a second time after the radiolink error identification is determined whilst still the connected mode exists; in other words before a radiolink-failure which involves a broken connection.
  • a jamming affection is indicated in case the comparison shows that the received wide band radio signal strength is unchanged or has increased from the first time to the second time.
  • the concept of the invention thus has an advantage overcoming solutions wherein a jamming detection is possible only in the idle mode or even only in the out of service mode.
  • the concept provides a method for detecting a jamming situation in-call/connection, that is to say, already when a dedicated channel is allocated for the mobile station a jamming situation or an approach of a jamming situation can be detected.
  • This has the advantage that a camera or other security systems can provide a better performance.
  • An anti-jamming detection is rather quick and countermeasures can be provided in a broader and earlier range.
  • a jamming detection is based on detecting that no cell can be received (BCCH) although a high RSSI level is measured.
  • BCCH no cell can be received
  • a mobile station will at first loose the connected mode of a communication radiolink and will than fall back into the idle mode. Subsequently, the mobile station will have to provide a band or channel search and only in the case this search is not successful a jamming situation can be assumed. In this stadium the mobile station might already be in the out of service situation. This is disadvantageous as it takes time to identify a jamming situation. However time is a valuable parameter in security applications like camera systems or the like.
  • the concept of the invention is able to indicate a jamming situation already when the user equipment still is functioning in a connected mode, although the radiolink in the connected mode is already endangered.
  • a radiolink timeout counter has reached a first threshold value, which is not the lowest threshold, like above zero or the like; i. e. before a (total) radiolink failure with broken connected mode.
  • a power indicator can be any suitable parameter which is directly measurable or can be deduced from a measurable parameter.
  • the received radio signal strength is a received wide band radio signal strength over the used radiofrequency of the communication user equipment.
  • the power indicator is an indicator for a downlink power; preferably the power indicator is or can be deduced from an unbiased downlink power indicator like a received signal strength indicator (RSSI) or the like.
  • RSSI received signal strength indicator
  • An application layer can be interfaced to and/or integrated in a communication module.
  • an application layer can be interfaced to the user equipment; e.g. by means of an interface apart from the communication radiolink by connection of the communication module and the application layer.
  • the communication module can be adapted to perform also evaluation functions in an application layer integrated in the module.
  • the radiolink evaluation it is evaluated whether the communication radiolink is affected by a radiolink-failure, and wherein in case of a radiolink-failure identification
  • a jamming affection is indicated due to indicating a radiolink-failure once a second counter-threshold is passed, in particular indicating a radiolink-failure once the scoring-counter falls below the second counter-threshold, e. g. the lowest counter-threshold like zero or the like.
  • a radiolink error is assumed to enclose any kind of disturbance of the radiolink which can be measured or determined actually.
  • a radiolink error in particular can be identified due to one, in particular a number of radiolink-irregularities e.g. due to a broken block and/or broken link and/or.
  • a rather severe kind of a radiolink irregularity is a radiolink failure, wherein a radiolink-failure is identified due to a fully decremented radiolink-failure timeout counter.
  • a radiolink error identification in the method thus is possible on basis of any radiolink irregularity, in particular a radiolink-failure or another radiolink irregularity.
  • a radiolink error can be specified according to a rather sensitive setting, namely any radiolink irregularity, in particular arising from a failure to receipt a sent test message, e.g. on a SACCH. Consequently, in case of an early power indicator exceeding a later power indicator an early jamming evaluation can be given well before a totally broken connection due to a radiolink-failure wherein a radiolink timeout counter already has reached a timeout-value.
  • determining the power indicator and evaluating the radiolink error in particular any kind of a radiolink-failure or irregularity, in combination is repeated in a predetermined time sequence.
  • this or other kind of repetition in a loop practically allows a steady supervision of a user equipment against a jamming attack.
  • the power indicator is an indicator for a downlink power like an incident downlink power spectral density.
  • a preferred indicator is an unbiased downlink power indicator like a received signal strength indicator RSSI or the like.
  • the indication can be given to an application layer of an evaluation unit which interfaces to the user equipment.
  • the evaluation unit By means of the evaluation unit it is possible to provide information discriminating between a jamming situation and an out-of-coverage-situation.
  • This kind of information can be signalized to a user.
  • a user can be a person or an automatic environment like an alarm or a supervision environment, in particular in mobile entities like a car for instance.
  • a person driving a car can be warned that at a certain location no alarm or supervision function can be achieved by the user equipment be that it may be due to a jamming situation or be that it may be due to an out-of-coverage situation.
  • the information to the automatic or personalized periphery by means of the evaluation unit can be used to provide further measures which are adapted to the kind of loss of service availability. For instance other alarm or supervision functions can be activated. For instance the situation can be used to save energy by cutting off a process which is not of use in an out-of-coverage situation.
  • a power indicator is considered as any parameter significant for a power. This, of course comprises a physically measurable power quantity itself, but also comprises any other value which is of use to denote quantitatively the power quantity.
  • the parameter not necessarily needs to have the metric unit of a power but can be a dimensionless quantity, in particular a ratio or logarithmic or bit-value or other value, which is suitable to quantitatively describe the physical power quantity.
  • PSD power spectral density
  • PSD Power Spectral Density
  • a PSD is a function of power versus frequency and when integrated across a given bandwidth (like a channel e. g.); the function represents the mean power in such a bandwidth.
  • the mean power is normalized to (divided by) the chip-rate it represents the mean energy per chip. This is the common practice of relating power and energy or the like magnitudes in communication systems.
  • a radiolink error is identified with a single radiolink irregularity or a sequence of irregularities e.g. two or three radiolink irregularities, in particular low number of radiolink irregularities.
  • a radiolink error, in particular irregularity can be measured by any suitable means.
  • a radiolink irregularity can be measured by sending a testmessage or another kind of radiolink-information item, either for test purposes only or also using usual sending of other messages or another kind of radiolink-information item, e. g. a paging message or a channel signal the like. Subsequently a missing receipt or non-decodability of the testmessage or other message can be detected.
  • a radiolink-failure identification is performed by:
  • a radiolink error e.g. a irregularity
  • a radiolink error can be indicated once a first counter decrement, in particular a first counter-threshold is passed.
  • a radiolink error can be indicated once the scoring-counter falls below the first counter-threshold.
  • a radiolink-failure can be indicated once a second counter-threshold is passed.
  • a radiolink-failure can be indicated once the scoring-counter falls below the second counter-threshold.
  • a scoring rule which can be easily implemented in a standard; like for instance the technical specification GSM ETSI TS0508 chapter 5.
  • a particular preferred scoring-counter is described in form of a radiolink timeout counter (RLT).
  • RLT radiolink timeout counter
  • Using the radiolink timeout counter is considered to be particular advantageous for identifying a radiolink error and/or a radiolink-failure.
  • a radiolink-testmessage is a testmessage sent on a slow associated control channel SACCH. Nevertheless, generally a radiolink-testmessage can also be a testmessage on any control channel CCH.
  • the instant development distinguishes basically from approaches using paging messages on a PCH channel or another message on a TCH channel, as these are only suited to serve as a basis in an idle mode, whereas the instant development is based on detecting a jamming situation already in the connected mode of a radiolink.
  • the RLT counter based on the downlink SACCH in 3GPP ETSI TS05.08 is only one example of a scoring-counter based on a control channel.
  • scoring-counter can indicate a radiolink-failure once the scoring-counter falls below a counter threshold. For instance, additionally the scoring-counter can be checked whether it decrements or increments continuously. This is an advantageous further condition for safely indicating a jamming situation.
  • a strong indicator for an upcoming radiolink-failure i. e. existing radiolink error
  • a radiolink timeout counter may not have reached a second threshold limit, but still nevertheless the consecutive sequence can be sufficient to give a safe extrapolation, that (and possibly also when) a radiolink-failure is to be expected.
  • a scoring rule is advantageous to detect a radiolink-failure before the radiolink-failure occurs, in particular before a second late countermeasure or limit countermeasure is passed.
  • a preferred embodiment as described with the drawing can be used, wherein a lower and a upper threshold value of a radiolink timeout counter serve as suitable countermeasures.
  • the instant concept and the developed configuration thereof are particularly advantageous in a radio network based on a cellular global system for mobile communications.
  • equivalent measures according to the concept can also be used in a CDMA based radio network like an UMTS network for detecting an in-call/connection jamming situation.
  • Fig. 1 shows a preferred embodiment of a method of detecting a jamming transmitter affecting a communication user equipment wherein the user equipment is activated in step S1, namely by switching on the user equipment to an active-status.
  • the user equipment is registering in the radio network, which in the present case is a GSM network (global systems for mobile communication).
  • GSM global systems for mobile communication
  • the user equipment will approach from the out of service situation after registering to the idle mode in step S3, wherein the user equipment is switched on but has not yet a dedicated channel allocated.
  • the user equipment is able to make or receive a call but does not have an active call.
  • a call establishment is done, i.e.
  • the user equipment receives or originates a call and once parameters are made as outlined in 3GPP TS45.008, the communication module will approach to the connected mode in step S5; then the communication module will have an active call on a dedicated channel, which has been allocated during step S4.
  • the signals can be transmitted in the dedicated connection or channel of the connected mode of the communication radiolink.
  • the further flow chart indicates measures, which can steadily be provided in a predetermined time sequence or loop by the communication module.
  • the measures are described for a process of a jamming situation, wherein a jamming signal J is affecting the user equipment UE.
  • a power indicator --here the so called received signal strength indicator RSSI-- is measured as an early power indicator and is determining at a first time t1 as a received wide band radio signal strength over the radio frequency band width of the antenna of the communication user equipment.
  • the early power indicator RSSI-t1 in step S6 is determined at the first time t1; thus well before in step S8 a radiolink-failure identification happens, due to the continued jamming action indicated along with step S7.
  • the received signal strength indicator RSSI measured at the first time t1 to determine the early power indicator RSSI-t1 can be stored or held by any suitable means as the early power indicator.
  • the early power indicator is available for later on comparison and contains a received signal strength indicator RSSI measured for an undisturbed situation of the user equipment at the first time t1.
  • the radiolink-failure identification in step S8 of the instant embodiment is prepared by decrementing --due to the jamming signal J-- a radiolink timeout counter RLT.
  • the radiolink timeout counter RLT is decremented continuously from a maximum value MAX to or below a counter-threshold, which is referenced by a value 0.
  • the radiolink-failure identification reliably is established by a radiolink timeout counter RLT with a value S equal to or below 0 and a positive parameter "cont".
  • RLT radiolink timeout counter
  • a further action can be specified as described in GSM ETSI TS04.18 and the radiolink timeout parameter can be transmitted by each BSS (Base Station System) in the data of the BCCH (Broadcast Control Channel) and the mobile station MS or other kind of user equipment UE shall continue transmitting as normal on the uplink until the value S reaches 0.
  • BSS Base Station System
  • BCCH Broadcast Control Channel
  • the algorithm of a further action shall start after the assignment of a dedicated channel and the value S shall be initialized to a value of the radiolink timeout counter.
  • the detailed operation is outlined in GSM ETSI TS05.08 chapter 5.2. This is the case for the NO-path N1 starting from step S8 and the NO-path N2 starting from step S10.
  • step S9 following the YES-path Y1-- a further determination of a later power indicator RSSI-t2 at a second time t2 after the radiolink-failure identification in step S8 is performed.
  • two power indicators are available; an early power indicator RSSI-t1 from step S6 --not influenced by the jamming signal J-- and a later power indicator RSSI-t2 from step S9 --influenced by the jamming signal J--.
  • step S10 the further condition is verified whether the received wide band radio signal strength RSSI is unchanged or has increased from the first time t1 to the second time t2.
  • step S10 the later power indicator RSSI-t2 is greater or equal to RSSI-t1
  • a jamming situation is indicated in step S11.
  • the jamming situation JAM can be indicated to an application APP in step S12.
  • a messaging by a software-interface or the like is possible to an application APP informing about the jamming situation JAM.
  • warnings about the jamming situation JAM can be given from another side of a higher system. A user or supervisor of the higher system level can be warned by the messaging in that jamming occurs and that a correct functioning of a security system cannot be guaranteed.
  • Fig. 2 shows a more elaborated exemplifying embodiment of a method of detecting a jamming transmitter affecting a communication user equipment UE in course of one or more radiolink-irregularities, preferably wherein a radiolink-irregularity is identified due to a broken block and/or broken link and/or a fully decremented timeout counter identifies a radiolink-failure.
  • a radiolink-irregularity is identified due to a broken block and/or broken link and/or a fully decremented timeout counter identifies a radiolink-failure.
  • the more elaborated second embodiment of a method of Fig. 2 starts in a first step SE1 wherein the user equipment UE is in a connected mode.
  • the radiolink timeout counter RLT is set to its maximum value MAX.
  • a power indicator parameter --here an RSSI-value RSSI-t1 at a first earlier point of time t1-- is acquired and hold; for instance by storing in a storing medium of or connected to a communication module in the user equipment UE.
  • step SE4 directly, namely by evaluating the radiolink; e.g. by sending a test message on the SACCH as described above.
  • a radiolink error can be indicated in step S5.
  • the radiolink-failure described with the embodiment of Fig.1 is only one exemplifying item of a radiolink irregularity, which --of course can also be define to be of minor severity.
  • a radiolink error identification in step SE5 thus is possible on basis of any radiolink irregularity according to the general part of these application documents, in particular well before a radiolink-failure is detected as outlined in the above description of Fig. 1 .
  • the RLT counter is decremented in step SE6.
  • the further later power indicator RSSI is measured in step SE7 as RSSI-t2. This procedure makes sure that the later power indicator RSSI-t2 at the second point of time t2 is measured already in a rather early stadium of radiolink irregularity, namely already just after the occurrence of a first radiolink-irregularity.
  • the sequence of steps SE5, SE6 and SE7 makes sure that an early jamming evaluation warning of Step SE16 is possible already right after the occurrence of a first radiolink irregularity.
  • a radiolink error is specified according to a rather sensitive setting, namely any radiolink irregularity, in particular arising from a failure to receipt a sent test message on a SACCH.
  • the instant elaborated method is able to provide an early jamming warning following the step SE9 and SE16 well before a totally broken connection and thus earlier than the embodiment described in Fig. 1 .
  • the Early Jamming warning level can be decreased and/or the warning state can be switched off.
  • the measurement of RSSI-t1 in step SE3 can be replaced by a setting of an early power indicator according to a best estimate value for a suitable cell. This allows a saving of energy consumption in a module.
  • an early jamming warning in step SE16 in the modified embodiment already is possible once an RLT counter decrement is evaluated in SE9 and a RRSI-t2 is below the best estimate value.
  • an estimation of a jamming probability is possible advantageously with taking into account further parameters of an instant situation of the module.
  • step SE5 a radiolink error is not indicated (NO-path NE1) the radiolink timeout counter RLT is incremented in step SE10. Thereafter in step SE11 it is verified further whether the RLT counter value is below a maximum value S ⁇ MAX.
  • Early Jamming Evaluation in step SE9. is continued until it can be safely assumed that no radiolink irregularity exists.
  • the radiolink timeout counter RLT is set to its maximum value MAX.
  • step SE13 a broken connection will be indicated in step SE13 and given as an indication of a jamming situation JAM to the user of a user equipment UE. Also, once the RLT counter value is equal to or below 0, an OOS warning can be given in step SE15.
  • the instant procedural steps can be performed by a module itself in user equipment itself, wherein an application APP in step SE14 is integrated into the module. Also the application layer can be interfaced to the module in the user equipment UE. The application APP can gather further information and parameters to rate the instant situation; thus is also capable to further modify the indication of a broken connection. Also the application APP is in receipt of an out-of-service warning OOS as depicted in step SE15 and a Jamming warning as depicted in step SE16.
  • Fig. 3 describes in more detail what has been indicated before as an embodiment of smoothed setting.
  • a particular preferred further extension of the procedure described with the second embodiment of Fig. 2 can be switched-in between junction items J1 following step SE7 and J2 before step SE12 as depicted in the flow chart of Fig. 2 .
  • the extension is preferably used to define application and usage dependent threshold criteria for very early indication of a radiolink error; which is also denoted as a jamming warning.
  • follow-up junction J1 in step SJ1 various threshold criteria can be defined. For instance it can be defined that a radiolink error is indicated only in the case the RLT counter decrements below a certain first threshold value Y.
  • step SE9 As a follow-up the early jamming warning of step SE9 is given only in the case the RLT counter has been decremented in step SE6 below the specified threshold value Y.
  • a number X of radiolink irregularities can be specified which define a consecutive sequence of one after the other radiolink irregularities.
  • step SJ1 dependent on the definition of threshold criteria in step SJ1 the conditions given in step SJ3 and SJ2 are checked.
  • the further procedure can reveal in step SJ2 that the RSSI-t2-value exceeds the RSSI-t1-value.
  • a jamming probability of step SJ4 can be given in step SJ5 --dependent on the severity of the threshold criteria defined in steps SJ3 and SJ2-- in the YES-path YJ1; otherwise in the case the condition is not fulfilled only a bad radiolink indication is given in step SJ6, in particular step SJ6 can also indicate an out-of-coverage-situation to the user if for example RSSI-t2 ⁇ RSSI-t1.
  • a jamming probability indication result of step SJ4 can be given additionally to or alternatively to an early jamming evaluation of step SE9 of the procedure in Fig. 2 .
  • a user of the user equipment UE can receive in an elaborated situation not only an early jamming evaluation indication from step SE9 but also an indication of probability of jamming as produced from step SJ7.
  • the jamming probability and the early jamming evaluation of steps SJ4 and/or SE9 respectively can be given to an application APP, in particular an application layer 10 as shown in Fig.4 .
  • the application layer primarily is adapted to provide further measures like e.g. provide signalling options for giving a jamming indication and/or warning to a user or other layers of a communication system and/or network.
  • the application layer 10 further measures as follow-up action can be evaluated to be taken or signalized to a user or connected items of the user equipment.
  • step SJ2 In the case the condition checked in step SJ2 is not fulfilled the supplement of the extended procedure is followed to the junction point J2 and continued with step SE12 shown in Fig. 2 . Also, if the RSSI-t2-value does not exceed the RSSI-t1-value (NO-path of step SJ3) in-between indication to the user of step SJ5 is suppressed for instance before continuing with junction J2 as outlined above. Thus, in the supplement between junction items J1 and J2 the user receives a bad radiolink warning as long the RLT counter value is above a minimum or low threshold in step SE12.
  • a user equipment UE is shown wherein a communication module 1, 1' and a connected application layer 10, 10' is provided in the user equipment UE.
  • the communication module 1, 1' is connected via an antenna 11 thus a received wide band radio signal strength can be measured by a power indicator 2 of the communication module.
  • the power indicator 2 will provide an RSSI value taking into account not only the usual network signal strength but also a strength of the jamming signal J.
  • a radiolink timeout module 3 is provided, capable of executing the step S7 of the method described in Fig. 1 or similar step SE6 as shown in Fig. 2 and Fig. 3 in the case an early jamming indication is preferred.
  • the radiolink timeout module 3 and the power indicator 2 are started repeatedly for determining the power indicator RSSI; a radiolink-failure evaluation is triggered by a clock 4 or the like sequencing unit.
  • step S11 a jamming indication of step S11 can be given to an application 7 connected to the module 1.
  • module 1' can be adapted only to provide the output of radiolink timeout module 3 and power indicator 2 to an application layer 10'; thus the application layer 10' can be adapted to provide the procedural steps of comparator 5 and unit 6.
  • a comparator 5 is triggered for comparing an early power indicator at a first time t1 and a later power indicator at a second time t2. The difference thereof is provided to an evaluation unit 6 for processing the step S10 of the method of Fig. 1 .
  • the result is positive, it can be assumed that the received wide band radio signal strength is unchanged or has increased from the first time t1 to the second time t2.
  • the user of the user equipment UE can be warned of the jamming situation.

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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)
  • Monitoring And Testing Of Transmission In General (AREA)
EP12156957.8A 2012-02-24 2012-02-24 Procédé de détection d'un émetteur parasite affectant un équipement d'utilisateur de communication, et système Active EP2632068B1 (fr)

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EP12156957.8A EP2632068B1 (fr) 2012-02-24 2012-02-24 Procédé de détection d'un émetteur parasite affectant un équipement d'utilisateur de communication, et système
CN201310131760.1A CN103441804B (zh) 2012-02-24 2013-02-25 检测干扰发射机的方法、系统、用户设备和通信模块

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TWI601387B (zh) 2016-06-22 2017-10-01 晨星半導體股份有限公司 包含錯誤更正程序之解碼裝置及解碼方法
CN107579803B (zh) * 2016-07-05 2020-07-03 联发科技股份有限公司 包括错误更正程序的解码装置及解码方法

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CA2433242A1 (fr) * 2002-07-03 2004-01-03 Newtrax Technologies Inc. Detecteur de brouilleur commercial
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CN103441804A (zh) 2013-12-11
CN103441804B (zh) 2017-04-26

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