JP4782858B2 - Warning method and wireless device using the same - Google Patents

Description

  The present invention relates to warning technology, and more particularly, to a warning method for warning theft of a wireless device and a wireless device using the warning method.

  In wireless communication, effective use of limited frequency resources is generally desired. One of the technologies for effectively using frequency resources is the adaptive array antenna technology. In the adaptive array antenna technology, the antenna directivity pattern is formed by controlling the amplitude and phase of signals transmitted and received by a plurality of antennas. That is, an apparatus equipped with an adaptive array antenna changes the amplitude and phase of signals received by a plurality of antennas, adds the changed received signals, and changes the amplitude and phase (hereinafter referred to as the amount of change). A signal equivalent to a signal received by an antenna having a directivity pattern corresponding to “weight” is received. In addition, a signal is transmitted by an antenna directivity pattern corresponding to the weight.

In the adaptive array antenna technique, an example of a process for calculating a weight is a method based on a minimum mean square error (MMSE) method. In the MMSE method, a Wiener solution is known as a condition for giving an optimum weight value, and a recurrence formula with a smaller amount of calculation than directly solving the Wiener solution is also known. As the recurrence formula, for example, an adaptive algorithm such as an RLS (Recursive Least Squares) algorithm or an LMS (Least Mean Squares) algorithm is used. Such an adaptive array antenna technology is being applied to a mobile communication system such as a simple mobile phone system and a base station apparatus of a wireless LAN (Local Area Network) (see, for example, Patent Document 1).
JP 2001-94499 A

  Since a terminal device that is a communication target of a base station device having such an adaptive array antenna is generally general, it may be stolen when the terminal device is placed away from the user. . On the other hand, since the weight and response coefficient derived by the base station apparatus equipped with the adaptive array antenna are values related to the position where the terminal apparatus communicating with the base station apparatus exists, When moving, the weight and response coefficient also change. However, since this variation occurs not only when the terminal device is stolen but also when the terminal device is simply moved, the two cannot be distinguished.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a warning method for estimating a theft of a terminal device and warning that when the theft is detected, and a wireless device using the warning method. There is.

  One embodiment of the present invention is a wireless device. The apparatus includes a connection unit that connects a wired network, a reception unit that receives a signal from a terminal device to be communicated via a plurality of antennas, and a derivation unit that derives a current reception response vector from the received signal. And a storage unit that stores the derived current reception response vector, a calculation unit that calculates a difference between the derived reception response vector and a past reception response vector stored in the storage unit, and a calculation over a period longer than a predetermined period. If the difference is greater than the threshold, the warning unit that outputs a warning about the terminal device to be communicated to the wired network via the connection unit, and the receiving unit sends a signal indicating a monitoring request from the terminal device to be communicated. When the warning unit receives a signal indicating a monitoring request and the calculated difference is greater than a threshold over a period longer than a predetermined period, the warning unit When a warning about the terminal device is output to the wired network via the connection unit, and the reception unit has not received a signal indicating a monitoring request, the warning unit should be used based on the difference calculated by the calculation unit A setting unit for setting a threshold value is provided.

  Another aspect of the present invention is a warning method. In this method, if the variation of the received response vector derived based on the signal from the terminal device of the communication target received via a plurality of antennas is larger than the threshold over a period longer than a predetermined period, the communication target Is a warning method for outputting a warning related to the terminal device to an external wired network, and when a signal indicating a monitoring request is received from a terminal device to be communicated, the derived variation occurs over a period longer than a predetermined period. If it is greater than the threshold, a warning about the terminal device to be communicated is output to the wired network, and if a signal indicating a monitoring request is not received from the terminal device to be communicated, the difference in fluctuation of the reception response vector is different. Based on this, the threshold is set.

  Yet another embodiment of the present invention is a program. The program includes a step of receiving a signal from a terminal device to be communicated via a plurality of antennas, a step of deriving a current reception response vector from the received signal, and a memory of the derived current reception response vector. The difference between the derived reception response vector and the past reception response vector stored in the memory, and the calculated difference over a period longer than a predetermined period than the threshold value stored in the memory in advance. If it is larger, the step of outputting a warning related to the terminal device to be communicated to an external wired network, and the step of receiving receives and outputs a signal indicating a monitoring request from the terminal device to be communicated. When a signal indicating a monitoring request is received, the calculated difference is longer than a predetermined period. If greater than, output a warning about the terminal device to be communicated to the wired network, and when the signal indicating the monitoring request is not received from the terminal device to be communicated, based on the difference in the variation of the reception response vector, Cause the computer to execute the step of setting the threshold.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  According to the present invention, when a theft of a terminal device is estimated and the theft is detected, a warning to that effect can be given.

1 is a diagram illustrating a configuration of a communication system according to a first embodiment. It is a figure which shows the structure of the terminal device of FIG. 1, and a base station apparatus. It is a figure which shows the structure of the signal processing part of FIG. It is a figure which shows the structure of the warning process part of FIG. It is a figure which shows the data structure of the terminal device information memorize | stored in the memory | storage part of FIG. It is a flowchart which shows the monitoring process of FIG. It is a flowchart which shows the response process of FIG.

  Before describing the present invention in detail, an outline will be described. An embodiment of the present invention relates to a base station apparatus provided with a plurality of antennas in a simple mobile phone system. The base station apparatus according to the present embodiment performs adaptive array processing on a reception signal from a communication target terminal apparatus using a plurality of antennas. In adaptive array processing, a reception response vector that reflects a wireless environment with a terminal device is generally calculated. The base station device monitors the time variation of the reception response vector, and if the variation of the reception response vector is large, the base station device determines that the terminal device has been stolen and warns the management server connected to the base station device via the wired network. A signal indicating is output. Furthermore, the management server notifies the user of the terminal device of a signal indicating a warning by a predetermined communication method.

  When there is a change in the reception response vector, the base station apparatus determines the theft in consideration of the period during which the fluctuation continues in order to distinguish the theft of the terminal apparatus from the simple movement of the terminal apparatus. That is, since it is unlikely that the person who has stolen the terminal device will immediately stop, it is determined that the terminal device is stolen if the period during which the fluctuation continues continues for a long time. In addition, since the user who owns the terminal device recognizes the case where the terminal device is likely to be stolen, for example, away from the terminal device, a signal requesting monitoring is received from the terminal device in advance. If the base station apparatus receives a signal requesting monitoring, the base station apparatus determines that the variation in the reception response vector is not a simple movement but a theft, and outputs a warning.

  FIG. 1 illustrates a configuration of a communication system 100 according to the first embodiment. The communication system 100 includes a terminal device 10, a base station device 34, a network 32, a management server 310, a mobile phone wired network 312, a mobile phone base station device 314, and a mobile phone 316.

  The terminal device 10 is a communication device that is owned by the user 318 and communicates with a base station device 34 described later. Although two terminal devices 10 are shown in the figure, the terminal device 10 connected to the base station device 34 by a dotted line is in a state before movement, and the terminal device 10 connected to the base station device 34 by a solid line is moving. It is a later state. The former terminal device 10 is in a state managed by the user 318, but the latter terminal device 10 is not under the management of the user 318 and shows a stolen state.

  The base station device 34 communicates with a plurality of terminal devices 10 (not shown) by adaptive array processing based on a plurality of antennas (not shown). Further, not only the wireless line but also the network 32 is connected, and when the theft of the terminal device 10 is detected, a warning signal is output to the management server 310 described later via the network 32.

  The management server 310 receives a warning regarding theft of the terminal device 10 from the base station device 34 as described above. In this case, the management server 310 notifies the mobile phone 316 owned by the user 318 of the theft of the terminal device 10 via the mobile phone wired network 312 and the mobile phone base station device 314.

  FIG. 2 shows configurations of the terminal device 10 and the base station device 34. The terminal device 10 includes a baseband unit 26, a modem unit 28, a radio unit 30, and a terminal antenna 16, and the base station device 34 includes a first base station antenna 14a, a second base station antenna 14a, and a second base station antenna 14. Base station antenna 14b, Nth base station antenna 14n, first radio unit 12a, second radio unit 12b, Nth radio unit 12n, signal processing unit 18, modem unit 20, baseband Part 22, control part 24, and warning processing part 300. In addition, as a signal, a first digital reception signal 200a, a second digital reception signal 200b, an Nth digital reception signal 200n, which are collectively referred to as a digital reception signal 200, a first digital transmission signal 202a, which is collectively referred to as a digital transmission signal 202, 2 digital transmission signal 202b, Nth digital transmission signal 202n, signal processing control signal 204, synthesis signal 206, pre-separation signal 208, reception response vector signal 212, monitoring request signal 220, and warning processing interface signal 222.

  The baseband unit 22 of the base station device 34 is an interface with the network 32, and the baseband unit 26 of the terminal device 10 is an interface with a PC connected to the terminal device 10 and an application inside the terminal device 10, Each communication system 100 performs transmission / reception processing of information signals to be transmitted. Further, error correction and automatic retransmission processing may be performed, but the description thereof is omitted here.

  The modem unit 20 of the base station device 34 and the modem unit 28 of the terminal device 10 modulate the carrier signal with an information signal to be transmitted and generate a transmission signal as a modulation process. Here, as a modulation method, π / 4 Shift QPSK (Quadrature Phase Shift Keying) is targeted. Further, as a demodulation process, the received signal is subjected to delay detection, and the transmitted information signal is reproduced.

  The signal processing unit 18 performs signal processing necessary for transmission / reception processing by the adaptive array antenna.

  The radio unit 12 of the base station apparatus 34 and the radio unit 30 of the terminal apparatus 10 include a baseband signal processed by the signal processing unit 18, the modem unit 20, the baseband unit 22, the baseband unit 26, and the modem unit 28. Frequency conversion processing between frequency signals, amplification processing, AD or DA conversion processing, etc. are performed.

  The base station antenna 14 of the base station apparatus 34 and the terminal antenna 16 of the terminal apparatus 10 perform transmission / reception processing of radio frequency signals. The directivity of the antenna may be arbitrary, and the number of antennas of the base station antenna 14 is N.

  The control unit 24 controls the timing of the radio unit 12, the signal processing unit 18, the modem unit 20, and the baseband unit 22.

  The warning processing unit 300 monitors the theft of the terminal device 10 based on the reception response vector signal 212 output from the signal processing unit 18, and when determining that the theft has been made, the warning processing unit 300 outputs a warning-related signal to the warning processing interface signal 222. Output as.

  This configuration can be realized in terms of hardware by a CPU, memory, or other LSI of an arbitrary computer, and in terms of software, it is realized by a program having a reservation management function loaded in memory. The functional block realized by those cooperation is drawn. Accordingly, those skilled in the art will understand that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.

  FIG. 3 shows the configuration of the signal processing unit 18. The signal processing unit 18 includes a synthesis unit 50, a reception weight vector calculation unit 56, a reference signal generation unit 58, a reception response vector calculation unit 60, a separation unit 62, and a transmission weight vector calculation unit 66. The synthesis unit 50 is a multiplication unit. 52 includes a first multiplication unit 52 a, a second multiplication unit 52 b, a third multiplication unit 52 c, a fourth multiplication unit 52 d, and an addition unit 54, and the separation unit 62 is a first multiplication collectively referred to as a multiplication unit 64. Part 64a, second multiplier 64b, third multiplier 64c, and fourth multiplier 64d. As signals, a first reception weight signal 210a, a second reception weight signal 210b, a third reception weight signal 210c, a fourth reception weight signal 210d, a reception response vector signal 212, a transmission weight signal, which are collectively referred to as a reception weight signal 210, A first transmission weight signal 214a, a second transmission weight signal 214b, a third transmission weight signal 214c, a fourth transmission weight signal 214d, a reception weight reference signal 216, and a reception response reference signal 218, which are collectively referred to as 214, are included.

  The reception weight vector calculation unit 56 generates a reception weight signal 210 required for weighting the digital reception signal 200 from the digital reception signal 200 and the reception weight reference signal 216 by using an RLS (Recursive Last Squares) algorithm or an LMS (Least Mean Squares) algorithm. Calculate by an adaptive algorithm such as

  The multiplier 52 weights the digital reception signal 200 with the reception weight signal 210, and the adder 54 adds the outputs of the multiplier 52 and outputs a combined signal 206.

  The reference signal generator 58 outputs the training signal stored in advance as a reception weight reference signal 216 and a reception response reference signal 218 during the training period. Further, after the training period, the composite signal 206 is determined with a predetermined threshold value, and the result is output as a reception weight reference signal 216 and a reception response reference signal 218. Note that the determination does not need to be a hard determination, and may be a soft determination.

  The reception response vector calculation unit 60 calculates the reception response vector signal 212 as the reception response characteristic of the reception signal with respect to the transmission signal from the digital reception signal 200 and the reception response reference signal 218. Although the calculation method of the reception response vector signal 212 may be arbitrary, it is executed based on correlation processing as shown below as an example. The digital reception signal 200 and the reception response reference signal 218 are input not only from within the signal processing unit 18 but also from a signal processing unit corresponding to another user's terminal device 10 through a signal line (not shown). To do. The digital reception signal 200 corresponding to the first terminal device 10 is indicated as x1 (t), the digital reception signal 200 corresponding to the second terminal device 10 is indicated as x2 (t), and the reception corresponding to the first terminal device 10 is indicated. If the response reference signal 218 is denoted by S1 (t) and the reception response reference signal 218 corresponding to the second terminal device 10 is denoted by S2 (t), x1 (t) and x2 (t) are expressed by the following equations. .

ここで、ｈｉｊは、第ｉ番目の端末装置１０から第ｊ基地局用アンテナ１４ｊまでの応答特性であり、また雑音は無視する。第１の相関行列Ｒ１は、Ｅをアンサンブル平均として、次の式で示される。

Here, hij is a response characteristic from the i-th terminal apparatus 10 to the j-th base station antenna 14j, and noise is ignored. The first correlation matrix R1 is expressed by the following equation, where E is an ensemble average.

受信応答参照信号２１８間の第２の相関行列Ｒ２も次の式のように計算される。

The second correlation matrix R2 between the reception response reference signals 218 is also calculated as follows.

最終的に、第２の相関行列Ｒ２の逆行列と第１の相関行列Ｒ１を乗算し、次の式で示される受信応答ベクトル信号２１２が求められる。なお、受信応答ベクトル信号２１２は、図示しない警告処理部３００にも出力される。

Finally, the inverse matrix of the second correlation matrix R2 and the first correlation matrix R1 are multiplied to obtain a reception response vector signal 212 expressed by the following equation. The reception response vector signal 212 is also output to a warning processing unit 300 (not shown).

送信ウエイトベクトル計算部６６は、分離前信号２０８の重み付けに必要な送信ウエイト信号２１４を、受信応答特性である受信ウエイト信号２１０や受信応答ベクトル信号２１２から推定する。送信ウエイト信号２１４の推定方法は、任意とするが、最も簡易な方法として、受信ウエイト信号２１０や受信応答ベクトル信号２１２をそのまま使用すればよい。あるいは、受信処理と送信処理の時間差で生じる伝搬環境のドップラー周波数変動を考慮して、従来の技術によって、受信ウエイト信号２１０や受信応答ベクトル信号２１２を補正してもよい。なお、ここでは、送信ウエイト信号２１４の推定に、受信応答ベクトル信号２１２を使用する。

The transmission weight vector calculation unit 66 estimates the transmission weight signal 214 necessary for weighting the pre-separation signal 208 from the reception weight signal 210 and the reception response vector signal 212 that are reception response characteristics. Although the estimation method of the transmission weight signal 214 is arbitrary, the reception weight signal 210 and the reception response vector signal 212 may be used as they are as the simplest method. Alternatively, the reception weight signal 210 and the reception response vector signal 212 may be corrected by a conventional technique in consideration of the Doppler frequency fluctuation in the propagation environment caused by the time difference between the reception process and the transmission process. Here, the reception response vector signal 212 is used to estimate the transmission weight signal 214.

  The multiplier 64 weights the pre-separation signal 208 with the transmission weight signal 214 and outputs the digital transmission signal 202. Note that the timing in the above operation is in accordance with the signal processing control signal 204.

  FIG. 4 shows the configuration of the warning processing unit 300. The warning processing unit 300 includes a storage unit 350, a calculation unit 352, a setting unit 354, a reception unit 356, a warning output unit 358, and a response unit 360.

  The accepting unit 356 receives a monitoring request from the terminal device 10 and notifies the storage unit 350, the setting unit 354, the warning output unit 358, and the response unit 360, which will be described later, that the monitoring state has been entered. On the other hand, a request for canceling the monitoring is also received from the terminal device 10, and in this case, the opposite process is performed when the monitoring request is received.

  The storage unit 350 stores the reception response vector signal 212. When the base station device 34 connects a plurality of terminal devices 10, the reception response vector signal 212 is stored for each terminal device 10. In addition, the notification output from the reception unit 356 that is in the monitoring state is also stored.

  The calculation unit 352 calculates the correlation between the reception response vector signal 212 stored in the storage unit 350 and the past reception response vector signal 212. Here, the frame interval of the reception response vector signal 212 to be calculated for correlation may be one frame interval or a plurality of frame intervals. Further, both the calculation for one frame interval and a plurality of frame intervals may be performed.

  The warning output unit 358 is a case where the correlation value calculated by the calculation unit 352 is smaller than the threshold value, that is, when the variation of the reception response vector signal 212 is large and the correlation value is smaller than the threshold value for a predetermined period. For example, when it continues for 1 second, a warning signal is output as the warning processing interface signal 222. The warning processing interface signal 222 is transmitted to the external management server 310.

  The setting unit 354 sets a threshold value to be compared with the correlation value of the reception response vector signal 212 used in the warning output unit 358 when the notification of the monitoring state of the terminal device 10 is not received from the reception unit 356. . For example, when the radio propagation environment between the terminal device 10 and the base station device 34 is static, the correlation value of the reception response vector signal 212 tends to increase if the terminal device 10 does not move. In this case, the threshold value is set high for the purpose of improving the detection accuracy so that any movement of the terminal device 10 can be detected. On the other hand, when the radio propagation environment between the terminal apparatus 10 and the base station apparatus 34 is dynamic, the correlation value of the reception response vector signal 212 tends to be small even if the terminal apparatus 10 does not move. In that case, in order to prevent the output of a warning when the terminal device 10 is not moved, the threshold value is set low for the purpose of preventing false detection.

  When the response unit 360 receives a notification of the monitoring state of the terminal device 10 from the reception unit 356, when the incoming call from the network 32 to the terminal device 10 is inputted by the warning processing interface signal 222, the response unit 360 On the other hand, a response is output as a warning processing interface signal 222 on behalf of the terminal device 10.

  FIG. 5 shows the data structure of the terminal device information stored in the storage unit 350. The “terminal device number” is an identification number of the terminal device 10 to which the base station device 34 is connected. The “reception response vector” is a reception response vector signal 212 for one terminal device 10. The reception response vector signal 212 is generally a vector quantity and has a plurality of components. Here, the reception response vector signal 212 is collectively shown as, for example, A1. Further, although A1, A2, and A3 are stored, it is assumed that A1 is a reception response vector signal 212 having a new derivation time. “Monitoring information” is set to “monitoring” when a notification of the monitoring state is received from the reception unit 356.

  FIG. 6 is a flowchart showing the monitoring process. The receiving unit 356 receives a monitoring request from the terminal device 10 (S10). The accepting unit 356 registers the monitoring request in the storage unit 350 (S12), and notifies the terminal device 10 of the completion of the monitoring request by the warning processing interface signal 222 (S14). The warning processing interface signal 222 is transmitted to the terminal device 10 via the base station antenna 14 or the like. The base station apparatus 34 transmits signals to the terminal apparatus 10 at predetermined time intervals (S16). The base station apparatus 34 receives a signal from the terminal apparatus 10 (S18), and the reception response vector calculation unit 60 calculates a reception response vector signal 212 (S20). That is, in the case of a simplified mobile phone system, if the terminal device 10 is not communicating, the terminal device 10 does not transmit a signal to the base station device 34, so the base station device 34 uses a signal for calculating the reception response vector signal 212. In order to make the terminal device 10 transmit, a signal is transmitted to the terminal device 10 in advance.

  The calculation unit 352 compares the reception response vector signal 212 with the past reception response vector signal 212 (S22). The correlation calculated by the warning output unit 358 of the reception response vector signal 212 and the past reception response vector signal 212 is smaller than the threshold (Y in S24), and the state where the correlation is smaller than the threshold is longer than the predetermined period. If it continues (Y of S26), the warning output part 358 will include a warning in the warning process interface signal 222, and will output it to the management server 310 via the network 32 (S28). On the other hand, the correlation calculated by the warning output unit 358 of the reception response vector signal 212 and the past reception response vector signal 212 is smaller than the threshold value (N in S24), or the state where the correlation is smaller than the threshold value is predetermined. If it does not last longer than the period (N in S26), the processing from step 16 is continued.

  FIG. 7 is a flowchart showing the response process. Steps 50 to 54 are the same as steps 10 to 14 in FIG. The response unit 360 receives an incoming call from the network 32 to the terminal device 10 by the warning processing interface signal 222 (S56). If the terminal device 10 that has received an incoming call is being monitored (Y in S58), the response unit 360 responds to the caller that the call cannot be made via the network 32 (S60). On the other hand, if the terminal device 10 that has received an incoming call is not being monitored (N in S58), the terminal device 10 is called in a normal procedure (S62).

  According to the embodiment of the present invention, when the variation of the reception response vector has continued for a longer period than the predetermined period, it is determined that the theft has occurred, so the probability of erroneously outputting a warning can be reduced. Further, since the theft is determined when a monitoring request is received from the terminal device in advance, the mere movement of the terminal device and the theft can be accurately distinguished. Further, since the threshold value to be compared with the variation of the reception response vector is changed according to the radio propagation environment, it is possible to accurately detect the theft in a static environment and to prevent the false detection of the theft in a dynamic environment.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are also within the scope of the present invention. is there.

  In the embodiment of the present invention, the communication system 100 has been described as a simple mobile phone system. However, the present invention is not limited to this, and other wireless communication systems such as a mobile phone system and a wireless LAN may be used. According to this modification, the present invention can be applied to various communication systems 100. That is, the base station apparatus 34 to which the terminal apparatus 10 should be connected may be included in the configuration requirements of the communication system 100.

  In the modification of the present invention, the communication system 100 transmits a signal in advance to calculate the reception response vector signal 212 to the terminal device 10 to be monitored. However, the present invention is not limited to this. For example, a signal may not be transmitted. According to this modification, the traffic in the wireless section can be reduced. That is, the base station apparatus 34 only needs to be able to receive signals from the terminal apparatus 10 at predetermined intervals.

  In the embodiment of the present invention, the management server 310 notifies the mobile phone 316 owned by the user 318 of the warning. However, the present invention is not limited to this. For example, a warning may be sent to a landline telephone or pager. According to this modification, various communication systems can be used as a communication system for notifying a warning. That is, it is only necessary to notify the user 318 of a warning.

  In the embodiment of the present invention, the calculation unit 352 calculates the correlation between the reception response vector signal 212 and the past reception response vector signal 212 in order to determine theft. However, the present invention is not limited to this. For example, the calculation unit 352 may calculate the correlation between the reception weight signal 210 and the past reception weight signal 210. In that case, the storage unit 350 stores the reception weight signal 210. According to this modification, the circuit size can be reduced because the reception response vector calculation unit 60 can be omitted from the circuit configuration. That is, it is only necessary to obtain a value that varies depending on the movement of the terminal device 10.

  10 terminal device, 12 radio unit, 14 base station antenna, 16 terminal antenna, 18 signal processing unit, 20 modem unit, 22 baseband unit, 24 control unit, 26 baseband unit, 28 modem unit, 30 radio unit, 32 network, 34 base station device, 50 combining unit, 52 multiplying unit, 54 adding unit, 56 receiving weight vector calculating unit, 58 reference signal generating unit, 60 receiving response vector calculating unit, 62 demultiplexing unit, 64 multiplying unit, 66 transmission Weight vector calculation unit, 100 communication system, 200 digital reception signal, 202 digital transmission signal, 204 signal processing control signal, 206 composite signal, 208 signal before separation, 210 reception weight signal, 212 reception response vector signal, 214 transmission weight signal,216 reception weight reference signal, 218 reception response reference signal, 220 monitoring request signal, 222 warning processing interface signal, 300 warning processing unit, 310 management server, 312 wired network for mobile phone, 314 base station device for mobile phone, 316 mobile phone , 318 user, 350 storage unit, 352 calculation unit, 354 setting unit, 356 reception unit, 358 warning output unit, 360 response unit.

Claims (3)

A connection for connecting a wired network;
A receiver that receives signals from a terminal device to be communicated via a plurality of antennas;
A derivation unit for deriving a current reception response vector from the received signal;
A storage unit for storing the derived current reception response vector;
A calculation unit for calculating a difference between the derived reception response vector and a past reception response vector stored in the storage unit;
A warning unit that outputs a warning about the terminal device to be communicated to the wired network via the connection unit if the calculated difference is greater than a threshold over a period longer than a predetermined period;
The receiving unit receives a signal indicating a monitoring request from the terminal device to be communicated, and the warning unit receives the signal indicating the monitoring request over a period longer than a predetermined period. If the difference is greater than a threshold value, a warning regarding the communication target terminal device is output to the wired network via the connection unit,
A setting unit configured to set a threshold to be used in the warning unit based on the difference calculated by the calculation unit when the reception unit has not received the signal indicating the monitoring request; A wireless device characterized. If the variation of the reception response vector derived based on the signal from the communication target terminal apparatus received via a plurality of antennas is larger than the threshold over a period longer than a predetermined period, the communication target terminal apparatus A warning method for outputting a warning about an external wired network,
When a signal indicating a monitoring request is received from the communication target terminal device, a warning regarding the communication target terminal device is wired if the derived variation is greater than a threshold over a period longer than a predetermined period. Output to the network,
Further, the warning method is characterized in that, when a signal indicating a monitoring request is not received from the terminal device to be communicated, the threshold value is set based on a difference in variation of a reception response vector. Receiving a signal from a terminal device to be communicated via a plurality of antennas;
Deriving a current reception response vector from the received signal;
Storing the derived current received response vector in a memory;
Calculating a difference between the derived reception response vector and a past reception response vector stored in the memory;
If the calculated difference is greater than a threshold value stored in advance in a memory over a period longer than a predetermined period, a warning regarding the communication target terminal device is output to an external wired network, and
The receiving step receives a signal indicating a monitoring request from the terminal device to be communicated,
In the outputting step, when a signal indicating the monitoring request is received, if the calculated difference is larger than a threshold over a period longer than a predetermined period, a warning regarding the communication target terminal device is wired. Output to the network,
Further, a program for causing a computer to execute the step of setting the threshold value based on a difference in fluctuation of a reception response vector when a signal indicating a monitoring request is not received from the communication target terminal device .

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