JP4598662B2 - Wireless information collection system - Google Patents

Description

  The present invention relates to a wireless information collection system for detecting a distribution of communication failures.

  2. Description of the Related Art Conventionally, there is a mobile communication system that includes a radio network control device, a radio base station that is accommodated in the radio network control device and controls a radio area, and a radio terminal device that moves within the radio area of the radio base station. In such a mobile communication system, a wireless network control device that controls a plurality of wireless base stations performs reception level measurement, interference level measurement, and other monitoring requests to the wireless base station and wireless terminal device, and the received monitoring results Based on the above, it is determined whether to set a reference level for transmission power control and whether to perform a handover (for example, see Patent Document 1).

JP 2004-235725 A

  However, in the conventional mobile communication system, it is possible to check the reception level between each wireless terminal device and the wireless base station, but it is impossible to detect the distribution of communication failures in the communication service area. there were. If such a distribution of communication faults can be created, it can be used for measures for recovering from communication faults and avoiding communication faults. However, in order to examine the distribution of communication failures, it is necessary to arrange dedicated sensors or the like over a wide communication service area, which increases the scale of the system.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a wireless information collection system that can detect the distribution of communication failures over a wide area while suppressing an increase in system scale.

The wireless information collection system of the present invention includes a plurality of wireless terminal devices, a wireless base station that communicates with the wireless terminal device and acquires transmission / reception state information indicating a transmission / reception state between the wireless terminal devices for each wireless terminal device Position information acquisition means for acquiring position information of each wireless terminal apparatus, transmission / reception state information for each wireless terminal apparatus acquired by the wireless base station, position information for each wireless terminal apparatus acquired by the position information acquisition means, based on, possess a distribution creation means and said radio terminal apparatus and the radio base station to create a communication failure distribution indicating a two-dimensional arrangement of the communication failure in a communicable area, the distribution generation unit, the A statistical processing unit that creates a transmission / reception state distribution indicating the state of the transmission / reception state in the communicable area from the transmission / reception state information and position information for each wireless terminal device, and the transmission / reception state distribution And the transmission / reception state information includes demodulating propriety information of radio waves received from the wireless terminal device, and the statistical processing unit is capable of the communication as the transmission / reception state distribution. A non-demodulable point distribution indicating a non-demodulable point in the area is created, and the determination unit generates a broadband electromagnetic noise at the non-demodulable point when the total area of the non-demodulable point is larger than a predetermined threshold. And a distribution indicating the presence or absence of the broadband electromagnetic noise is created as the communication failure distribution .
Further, in one configuration example of the wireless information collection system of the present invention, the determination unit is configured such that the total area of the non-demodulable points is larger than a predetermined threshold and the number of wireless terminal devices existing in the non-demodulable points Is divided by a predetermined area of the non-demodulable point and the density of the wireless terminal device is larger than a predetermined number threshold, it is determined that broadband electromagnetic noise is generated .

In addition, the wireless information collection system of the present invention communicates with a plurality of wireless terminal devices and the wireless terminal device, and obtains transmission / reception state information indicating a transmission / reception state between the wireless terminal devices for each wireless terminal device. A base station, position information acquisition means for acquiring position information of each wireless terminal apparatus, transmission / reception state information for each wireless terminal apparatus acquired by the wireless base station, and position for each wireless terminal apparatus acquired by the position information acquisition means Distribution creating means for creating a communication failure distribution indicating a two-dimensional arrangement of communication failures in an area where the wireless terminal device and the wireless base station can communicate based on information, and the distribution creating means A statistical processing unit that creates a transmission / reception state distribution indicating a state of the transmission / reception state in the communicable area from the transmission / reception state information and position information for each wireless terminal device; and the transmission / reception state Displacement distribution indicating displacement of the transmission / reception state in the communicable area from a storage unit for storing cloth, a current transmission / reception state distribution created by the statistical processing unit, and a past transmission / reception state distribution stored in the storage unit And a determination unit that creates the communication failure distribution based on the displacement distribution, the transmission / reception state information includes information on whether radio waves received from the wireless terminal device can be demodulated, and the statistical processing unit includes: A non-demodulable point distribution indicating a non-demodulable point in the communicable area is created as the transmission / reception state distribution, and the determination unit is the current non-demodulable point distribution created by the statistical processing unit and the past stored in the storage unit A displacement distribution of non-demodulable points in the communicable area is created from the distribution of non-demodulable points, and the total area of the displacement distribution of the non-demodulable points is a predetermined threshold. Greater than, broadband electromagnetic noise is determined to be generated in the demodulation impossible point, it is characterized in that to create a distribution indicating the presence or absence of the wide-band electromagnetic noise as the communication failure distribution.
Moreover, in one configuration example of the wireless information collection system of the present invention, the determination unit includes a wireless terminal that has a total area of displacement distribution of the non-demodulable point larger than a predetermined threshold value and exists in the non-demodulable point. When the density of the wireless terminal device obtained by dividing the number of devices by a predetermined area of the displacement distribution of the non-demodulable point is larger than a predetermined number threshold, it is determined that broadband electromagnetic noise is generated. To do .
In addition, the wireless information collection system of the present invention communicates with a plurality of wireless terminal devices and the wireless terminal device, and obtains transmission / reception state information indicating a transmission / reception state between the wireless terminal devices for each wireless terminal device. A base station, position information acquisition means for acquiring position information of each wireless terminal apparatus, transmission / reception state information for each wireless terminal apparatus acquired by the wireless base station, and position for each wireless terminal apparatus acquired by the position information acquisition means Distribution creating means for creating a communication failure distribution indicating a two-dimensional arrangement of communication failures in an area where the wireless terminal device and the wireless base station can communicate based on information, and the distribution creating means A statistical processing unit that creates a transmission / reception state distribution indicating a state of the transmission / reception state in the communicable area from the transmission / reception state information and position information for each wireless terminal device; and the transmission / reception state Displacement distribution indicating displacement of the transmission / reception state in the communicable area from a storage unit for storing cloth, a current transmission / reception state distribution created by the statistical processing unit, and a past transmission / reception state distribution stored in the storage unit And a determination unit that generates the communication failure distribution based on the displacement distribution, the transmission / reception state information includes information on received radio wave intensity, and the statistical processing unit receives the received radio wave as the transmission / reception state distribution. An intensity distribution is created, and the determination unit determines the received radio wave intensity in the communicable area from the current received radio wave intensity distribution created by the statistical processing unit and the past received radio wave intensity distribution stored in the storage unit. When a displacement distribution is created, and there is a point where the displacement of the received radio wave intensity is negative and the state where the absolute value of the displacement is greater than a predetermined threshold continues for a predetermined time, Point determines that broadband electromagnetic noise is generated in the, it is characterized in that to create a distribution indicating the presence or absence of the wide-band electromagnetic noise as the communication failure distribution.

Further, in one configuration example of the wireless information collection system of the present invention, the position information acquisition unit specifies the position of the wireless terminal device by communication between the wireless terminal device and at least one of the wireless base stations, and The position information is acquired.
Moreover, in one configuration example of the wireless information collection system of the present invention, the position information acquisition means acquires the position information transmitted from the wireless terminal device via the wireless base station.
In one configuration example of the wireless information collection system of the present invention, the wireless base station obtains the transmission / reception state information for a plurality of wireless frequencies.
Further, in one configuration example of the wireless information collection system of the present invention, a plurality of the wireless base stations are arranged in the communicable area, and the distribution creating means creates the communication failure distribution for each wireless base station. It is.

  According to the present invention, based on the transmission / reception state information for each wireless terminal apparatus acquired by the wireless base station and the position information for each wireless terminal apparatus acquired by the position information acquisition unit, the two-dimensional communication failure in the communicable area is achieved. A communication failure distribution indicating the arrangement can be created. In the present invention, since a communication failure distribution can be created without using a dedicated sensor, an increase in system scale can be suppressed.

  Also, in the present invention, a communication failure distribution can be created based on this transmission / reception state distribution by creating a transmission / reception state distribution in the communicable area from the transmission / reception state information and position information for each wireless terminal device.

  In the present invention, a transmission / reception state distribution in the communicable area is created from the transmission / reception state information and position information for each wireless terminal device, and the transmission / reception state in the communicable area is determined from the current transmission / reception state distribution and the past transmission / reception state distribution. By creating the displacement distribution, it is possible to create a communication failure distribution based on this displacement distribution.

In the present invention, a non-demodulable point distribution indicating a non-demodulable point distribution in a communicable area is created as a transmission / reception state distribution, and broadband electromagnetic noise is detected by comparing this non-demodulable point distribution with a predetermined threshold. be able to.
Further, in the present invention, a non-demodulable point distribution in the communicable area is created as a transmission / reception state distribution, and a displacement distribution of non-demodulable points is created from the current non-demodulable point distribution and the past non-demodulable point distribution. And a predetermined threshold value, broadband electromagnetic noise can be detected.
In the present invention, the total area of the non-demodulable points or the total area of the displacement distribution of the non-demodulable points is larger than a predetermined threshold value, and the number of wireless terminal devices existing in the non-demodulable points is determined as the predetermined non-demodulable points. By determining that broadband electromagnetic noise is generated only when the density of the wireless terminal device divided by the predetermined area of the displacement distribution of the area or the non-demodulable point distribution is larger than the predetermined number threshold, The accuracy of detection can be improved.

  Further, in the present invention, a received radio wave intensity distribution is created as a transmission / reception state distribution, and a displacement distribution of a received radio wave intensity in a communicable area is created from a current received radio wave intensity distribution and a past received radio wave intensity distribution. And a predetermined threshold value can be compared to create a communication failure distribution.

  Further, in the present invention, a received radio wave intensity distribution is created as a transmission / reception state distribution, and a displacement distribution of a received radio wave intensity in a communicable area is created from a current received radio wave intensity distribution and a past received radio wave intensity distribution. And a predetermined threshold value, broadband electromagnetic noise can be detected.

  In the present invention, the position information of the wireless terminal device can be acquired by specifying the position of the wireless terminal device through communication between the wireless terminal device and at least one wireless base station.

  In the present invention, the position information of the wireless terminal device can be acquired by receiving the position information transmitted from the wireless terminal device via the wireless base station.

  In the present invention, the detection accuracy of broadband electromagnetic noise can be improved by obtaining transmission / reception state information for a plurality of radio frequencies.

  Also, by creating a communication failure distribution for each radio base station, it is possible to create a communication failure distribution over a wide communicable area covered by a plurality of radio base stations.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a wireless information collecting system according to the first embodiment of the present invention. The wireless information collection system according to the present embodiment communicates with a plurality of wireless terminal devices 1 such as mobile phones and the wireless terminal device 1, and transmits / receives transmission / reception state information indicating a transmission / reception state between the wireless terminal devices 1 to the wireless terminal A wireless base station 2 acquired for each device, a mobile communication switching center 3 that connects the wireless terminal device 1 and a counterpart terminal via a public network 6 such as a fixed telephone network or the wireless base station 2, and each wireless terminal device 1 Based on the location database 4 for storing the location information, the transmission / reception state information for each wireless terminal device acquired by the wireless base station 2, and the location information of the wireless terminal device 1, the two-dimensional arrangement of communication failures in the communicable area And a statistical processing device 5 (distribution creating means) for creating a communication failure distribution indicating

  In FIG. 1, reference numeral 7 denotes a cell, which is an area covered by each radio base station 2, that is, an area where radio waves from the radio base station 2 reach. The mobile communication switching center 3 and the position database 4 constitute position information acquisition means for acquiring the position information of each wireless terminal device 1.

  FIG. 2 is a block diagram illustrating a configuration example of the radio base station 2. The radio base station 2 includes an antenna 20, a receiving unit 21 that receives radio waves from the radio terminal device 1 via the antenna 20, a transmission unit 22 that transmits radio waves to the radio terminal device 1 via the antenna 20, And a radio wave state acquisition unit 23 that acquires transmission / reception state information for each terminal device.

  FIG. 3 is a block diagram illustrating a configuration example of the statistical processing device 5. The statistical processing device 5 includes a statistical processing unit 50 that creates a transmission / reception state distribution in a communicable area from transmission / reception state information and position information for each wireless terminal device, and a storage unit that stores the transmission / reception state distribution created by the statistical processing unit 50 51, a transmission / reception state displacement distribution in the communicable area is created from the current transmission / reception state distribution created by the statistical processing unit 50 and the past transmission / reception state distribution stored in the storage unit 51, and communication is performed based on the displacement distribution. And a determination unit 52 that creates a failure distribution.

Hereinafter, the operation of the wireless information collection system of this embodiment will be described. Here, as an example, the description will be made assuming that the use frequency is 300 MHz, and the size of the cell 7 that is an area allocated to one radio base station 2 is 5 km square.
The wireless terminal device 1 and the wireless base station 2 are not only at the time of a call in which communication information such as voice data is exchanged between the wireless terminal device 1 and the partner terminal, but also at regular intervals (for example, 1 second). Every).

  The receiving unit 21 of the radio base station 2 demodulates the radio wave received from the radio terminal device 1 received via the antenna 20 and transmits the demodulated communication information to the mobile communication switching center 3. The radio wave state acquisition unit 23 of the radio base station 2 measures the intensity of the radio wave received from the radio terminal device 1 received by the reception unit 21, and the RSSI (Received Signal Strength Indicator) representing the measured received radio wave intensity and the identification of the own station. Transmission / reception state information including a number (hereinafter referred to as a base station ID) and an identification number (hereinafter referred to as a terminal ID) such as a telephone number of the wireless terminal device 1 is transmitted to the mobile communication switching center 3. The communication information and the transmission / reception state information may be time-division multiplexed, for example, and transmitted to the mobile communication switching center 3 through one communication line.

  The mobile communication switching center 3 connects the wireless terminal device 1 and the partner terminal via the public network 6 or the wireless base station 2 during a call, and transmits the communication information received from the wireless terminal device 1 to the public network 6 or the wireless base station 2. The communication information received from the counterpart terminal is transmitted to the radio terminal device 1 via the radio base station 2.

  Further, the mobile communication switching center 3 acquires the terminal ID and the base station ID from the received transmission / reception status information, and the wireless terminal device 1 corresponding to the terminal ID is in the cell of the wireless base station 2 corresponding to the base station ID. The position information indicating the presence is registered in the position database 4, and the transmission / reception state information is transmitted to the statistical processing device 5. The mobile communication switching center 3 updates such a location database 4 at regular intervals according to transmission / reception state information.

  Here, the position of the wireless terminal device 1 is specified based on the transmission / reception state information from one wireless base station 2, but the wireless terminal device 1's position is determined based on the transmission / reception state information from a plurality of wireless base stations 2. The position may be specified. In this case, the mobile communication switching center 3 acquires the terminal ID and the base station ID from the transmission / reception state information received from the plurality of radio base stations 2, respectively, and the radio wave received from the radio terminal device 1 with the same terminal ID is the most. A strong radio base station 2 is identified based on RSSI included in each transmission / reception state information, and location information indicating that the radio terminal device 1 exists in the cell of the radio base station 2 is registered in the location database 4. Alternatively, the mobile communication switching center 3 determines that the wireless terminal device 1 exists at a point where cells of a plurality of wireless base stations 2 that have received radio waves from the wireless terminal device 1 having the same terminal ID overlap, and the cell is Position information indicating that the wireless terminal device 1 exists at the overlapping point may be registered in the position database 4.

  Also, the mobile communication switching center 3 uses the RSSI included in the transmission / reception state information received from the plurality of radio base stations 2 to obtain the received radio wave intensity measured at each radio base station 2 for the radio terminal device 1 with the same terminal ID. The position of the radio terminal device 1 in the cell is detected in more detail by obtaining the magnitude relationship of the distance between the radio terminal device 1 and each radio base station 2 from the magnitude relationship of the received radio wave intensity. Information may be registered in the position database 4.

  In addition, when the wireless terminal device 1 includes a GPS (Global Positioning System) that detects the position (latitude, longitude) of the device itself, the wireless terminal device 1 transmits position information to the wireless base station 2. May be. In this case, the radio base station 2 registers the position information received by the mobile communication switching center 3 in the position database 4 by transmitting the transmission / reception state information including the position information received from the radio terminal device 1 to the mobile communication switching center 3. To do.

  In addition, each radio base station 2 may be provided with a plurality of directional antennas 20 having different transmission / reception directions, and the direction of the radio terminal device 1 viewed from the radio base station 2 may be determined. In this case, the radio base station 2 transmits transmission / reception state information including direction information of the radio terminal device 1 to the mobile communication switching center 3. The mobile communication switching center 3 detects the position of the wireless terminal device 1 in the cell in more detail from the direction information included in the transmission / reception state information received from one or a plurality of wireless base stations 2, and The position information is registered in the position database 4.

  Next, the statistical processing unit 50 of the statistical processing device 5 receives the transmission / reception state information from the mobile communication switching center 3, and stores the position information of the wireless terminal device 1 corresponding to the terminal ID included in the transmission / reception state information in the position database 4. The received radio wave intensity represented by the RSSI of the transmission / reception state information and the position of the wireless terminal device 1 are averaged in unit time (for example, 1 minute). The statistical processing unit 50 performs such reception radio wave intensity averaging and position averaging for each terminal ID and each cell (for each radio base station).

  Then, based on the average received radio wave intensity and the average position for each radio terminal device, the statistical processing unit 50 communicates with the communication area of this system (the area where radio waves reach from at least one radio base station 2, that is, the radio terminal device 1 In the case of a cellular phone, a reception radio wave intensity distribution in which the received radio wave intensity within a region where a communication service can be provided is represented by contour lines is created for each cell.

  The storage unit 51 of the statistical processing device 5 stores the received radio wave intensity distribution created by the statistical processing unit 50. FIG. 4 shows an example of the received radio wave intensity distribution E (T1) at time T1 stored in the storage unit 51. In FIG. 4, the numerical values of 1, 1/4, 1/9, 1/16, and 1/32 written on the concentric contour lines are normalized with each received radio wave intensity being set to 1. It is the value. In the example of FIG. 4, a concentric received radio wave intensity distribution is shown in the cell of one radio base station 2, but it goes without saying that the actual received radio wave intensity distribution is not necessarily concentric.

  Next, the determination unit 52 of the statistical processing device 5 receives the received radio wave intensity distribution E (T2) at the current time T2 created by the statistical processing unit 50 and the received radio wave intensity distribution E one unit time before stored in the storage unit 51. (T1) is calculated for each cell, and a displacement distribution E (T2) / (T1) of received radio wave intensity is created for each cell. FIG. 5 shows an example of the received radio wave intensity distribution E (T2) at the current time T2. Displacement distribution E (T2) / obtained as a result of arithmetic processing (in this embodiment, division processing for obtaining the ratio of E (T2) and E (T1)) of received radio wave intensity E (T2) and E (T1) (T1) is as shown in FIG. In the example of FIG. 6, it is shown that the received radio wave intensity is displaced by half in the cell of the radio base station 2.

  Subsequently, the determination unit 52 estimates the distribution of communication failures in the communicable area by comparing the received radio field intensity displacement distribution E (T2) / (T1) with a predetermined threshold value. That is, the determination unit 52 compares the displacement of the received radio wave intensity on the time axis at each position in the communicable area with the threshold value for each unit time and for each position, and the displacement of the received radio wave intensity is negative. If there is a point where the absolute value of the displacement is greater than the threshold value, it is estimated that a communication failure has occurred at this point. Based on such estimation, the determination unit 52 creates a distribution indicating the presence or absence of a communication failure. Possible causes of communication failure include at least one of clouds, rain, fog, lightning, hail, hail, smoke, photochemical smog, buildings, jamming waves, and the like.

  As described above, in this embodiment, a received radio wave intensity distribution is created based on transmission / reception state information and position information for each wireless terminal device, and received from the current received radio wave intensity distribution and the past received radio wave intensity distribution. By creating a displacement distribution of radio wave intensity and comparing this displacement distribution with a threshold value, a communication failure distribution can be created over a wide communicable area. If such a communication failure distribution can be created, it can be used for communication failure recovery measures and communication failure avoidance. Moreover, in this Embodiment, since the radio | wireless terminal apparatus 1, the radio base station 2, and the mobile communication switching center 3 of a mobile communication system can be utilized, the apparatus newly installed is reduced and the increase in a system scale is suppressed. be able to.

  In the present embodiment, the received radio wave intensity distribution of one unit time ago is used as the past received radio wave intensity distribution in the calculation process for obtaining the received radio wave intensity displacement distribution, but the average value of the past received radio wave intensity distributions is used. It may be used.

  Further, in the present embodiment, division processing for obtaining the ratio of the received radio wave intensity distribution is used as the calculation process for obtaining the displacement distribution of the received radio wave intensity, but the received radio wave intensity distribution at the current time and the past received radio wave intensity distribution are Subtraction processing using the difference between the two as a displacement distribution may be used.

  In the present embodiment, an example in which a received radio wave intensity distribution is created mainly based on transmission / reception state information from one radio base station 2 has been described. The received radio wave intensity distribution may be created for each station (each cell). FIG. 7 shows an example of the received radio wave intensity distribution created for each cell. In the example of FIG. 7, received radio wave intensity distributions EA (T1), EB (T1), and EC (T1) are created for each cell of each of the radio base stations 2-A, 2-B, and 2-C. The received radio wave intensity distributions EA (T1), EB (T1), and EC (T1) of each cell are the received radio wave intensity distributions viewed from the central radio base stations 2-A, 2-B, and 2-C, respectively.

  In addition, the received radio wave intensity is not measured only for the radio terminal apparatus 1 belonging to the cell of its own station, and each radio base station 2 measures the received radio wave intensity of the radio terminal apparatus 1 belonging to the cell of another station. Then, the transmission / reception status information of the wireless terminal device 1 may be transmitted to the mobile communication switching center 3. For example, in the situation shown in FIG. 8, radio waves from the wireless terminal device 1 can be received by the wireless base stations 2-A and 2-B.

[Second Embodiment]
According to the first embodiment, for example, a communication failure that occurs locally in a cell unit or at a specific position in a cell can be detected, but there is also a communication failure that occurs in a wider range and in a wider band. As a cause of such a communication failure, there is an electromagnetic wave caused by a change in the crust or the ground. The generation of this electromagnetic wave may be a precursor of an earthquake. In the present embodiment, the generation of such an electromagnetic wave is detected. Also in the present embodiment, since the configuration as the wireless information collecting system is the same as that of the first embodiment, the operation of the present embodiment will be described using the reference numerals of FIGS.

  As described above, pulsed broadband electromagnetic noise may occur over a wide area as a precursor of an earthquake. If the radio base station 2 observes the received radio wave intensity from the radio terminal device 1 when such broadband electromagnetic noise occurs, the radio signal from the radio terminal device 1 receives the received signal RS as shown in FIG. In addition, broadband electromagnetic noise N is superimposed.

  On the other hand, when the intensity of the broadband electromagnetic noise N is large, when the wireless terminal device 1 exists near the area where the broadband electromagnetic noise N is generated, or when the wireless terminal device 1 is away from the wireless base station 2, FIG. As shown in FIG. 3, the difference in intensity between the received signal RS and the broadband electromagnetic noise N is reduced, and the received signal RS is buried in the broadband electromagnetic noise N. In such a case, there is a possibility that the received signal RS cannot be demodulated. In this embodiment, whether or not such demodulation is possible is detected to detect broadband electromagnetic noise.

  Similarly to the first embodiment, the radio wave state acquisition unit 23 of the radio base station 2 measures the intensity of radio waves from the radio terminal device 1 received by the reception unit 21. Then, the radio wave state acquisition unit 23 transmits transmission / reception state information including RSSI indicating the measured received radio wave intensity, the base station ID of the local station, and the terminal ID of the wireless terminal device 1 to the mobile communication switching center 3. The communication information and the transmission / reception status information may be multiplexed and transmitted to the mobile communication switching center 3 through one communication line.

  Similar to the first embodiment, the mobile communication switching center 3 updates the position information of the wireless terminal device 1 registered in the position database 4 at regular intervals, and transmits / receives transmission / reception state information received from the wireless base station 2. Is transmitted to the statistical processing device 5.

  Similar to the first embodiment, the statistical processing unit 50 of the statistical processing device 5 receives the transmission / reception state information from the mobile communication switching center 3, and the wireless terminal device 1 corresponding to the terminal ID included in the transmission / reception state information. Is obtained from the position database 4 and the received radio wave intensity represented by the RSSI of the transmission / reception state information and the position of the wireless terminal device 1 are averaged for each terminal ID and each cell. Then, the statistical processing unit 50 creates a received radio wave intensity distribution in the communicable area for each cell based on the average received radio wave intensity and the average position for each wireless terminal device.

  The storage unit 51 of the statistical processing device 5 stores the received radio wave intensity distribution. Next, the determination unit 52 of the statistical processing device 5 receives the received radio wave intensity distribution E (T2) at the current time T2 created by the statistical processing unit 50 and the received radio wave intensity distribution E one unit time before stored in the storage unit 51. (T1) is calculated for each cell, and a displacement distribution E (T2) / (T1) of received radio wave intensity is created for each cell. The calculation process at this time may be a division process for obtaining a ratio of received radio wave intensity distributions or a subtraction process for obtaining a difference of received radio wave intensity distributions.

  Subsequently, the determination unit 52 detects broadband electromagnetic noise by comparing the displacement distribution E (T2) / (T1) of the received radio wave intensity with a predetermined threshold value. That is, the determination unit 52 compares the displacement of the received radio wave intensity on the time axis at each position in the communicable area with the threshold value for each unit time and for each position, and the displacement of the received radio wave intensity is negative. If there is a point where a state where the absolute value of the displacement is greater than the threshold value continues for a predetermined time, it is estimated that broadband electromagnetic noise is generated at this point. Based on such estimation, the determination unit 52 creates a distribution indicating the presence or absence of broadband electromagnetic noise. As described above, the cause of the generation of broadband electromagnetic noise is considered to be fluctuations in the crust and ground.

  As described above, in this embodiment, a received radio wave intensity distribution is created based on transmission / reception state information and position information for each wireless terminal device, and received from the current received radio wave intensity distribution and the past received radio wave intensity distribution. By creating a displacement distribution of radio wave intensity and comparing this displacement distribution with a threshold value, it is possible to detect broadband electromagnetic noise generated in a wide range and in a wide band. If broadband electromagnetic noise can be detected, information on the generation of broadband electromagnetic noise can be used as earthquake prediction information. Moreover, in this Embodiment, since the radio | wireless terminal apparatus 1, the radio base station 2, and the mobile communication switching center 3 of a mobile communication system can be utilized, the apparatus newly installed is reduced and the increase in a system scale is suppressed. be able to.

  In the present embodiment, the received radio wave intensity distribution of one unit time ago is used as the past received radio wave intensity distribution in the calculation process for obtaining the received radio wave intensity displacement distribution, but the average value of the past received radio wave intensity distributions is used. It may be used.

  In the present embodiment, an example in which a received radio wave intensity distribution is created mainly based on transmission / reception state information from one radio base station 2 has been described. The received radio wave intensity distribution may be created for each station (each cell). In addition, the received radio wave intensity is not measured only for the radio terminal apparatus 1 belonging to the cell of its own station, and each radio base station 2 measures the received radio wave intensity of the radio terminal apparatus 1 belonging to the cell of another station. Then, the transmission / reception status information of the wireless terminal device 1 may be transmitted to the mobile communication switching center 3.

[Third Embodiment]
In the second embodiment, the broadband electromagnetic noise is detected using the received radio wave intensity distribution. However, the broadband electromagnetic noise may be detected using a non-demodulable point distribution indicating a non-demodulable point in the communicable area. . Also in the present embodiment, since the configuration as the wireless information collecting system is the same as that of the first embodiment, the operation of the present embodiment will be described using the reference numerals of FIGS.

  The radio wave state acquisition unit 23 of the radio base station 2 according to the present embodiment receives the RSSI representing the measured received radio wave intensity, the base station ID of the own station, the terminal ID of the radio terminal device 1, and the radio terminal device 1. The transmission / reception state information including the demodulation propriety information indicating whether the radio wave is demodulated is transmitted to the mobile communication switching center 3. The operation of the mobile switching center 3 is the same as that in the first embodiment.

  Similar to the first embodiment, the statistical processing unit 50 of the statistical processing device 5 receives the transmission / reception state information from the mobile communication switching center 3, and the wireless terminal device 1 corresponding to the terminal ID included in the transmission / reception state information. Is obtained from the position database 4 and the received radio wave intensity represented by the RSSI of the transmission / reception state information and the position of the wireless terminal device 1 are averaged for each terminal ID and each cell. Then, the statistical processing unit 50 creates a received radio wave intensity distribution in the communicable area for each cell based on the average received radio wave intensity and the average position for each wireless terminal device.

The storage unit 51 of the statistical processing device 5 stores the received radio wave intensity distribution. FIG. 11 shows an example of the received radio wave intensity distribution E (T1) at time T1 stored in the storage unit 51.
Subsequently, the statistical processing unit 50 of the statistical processing device 5 is based on the received radio wave intensity distribution E (T1) stored in the storage unit 51 and the demodulation propriety information included in the transmission / reception state information. A non-demodulable point distribution F (T1) indicating is generated for each cell. That is, the statistical processing unit 50 creates the non-demodulable point distribution F (T1) by leaving only the received radio wave intensity of the wireless terminal device 1 whose demodulation availability information indicates that demodulation is impossible in the received radio wave intensity distribution E (T1). To do.

  FIG. 12 shows an example of the non-demodulable point distribution F (T1). In the example of FIG. 12, since radio waves from the radio terminal devices 1-a, 1-b, 1-c, 1-d cannot be demodulated, the radio terminal devices 1-a, 1-b, 1-c, 1 By leaving only the received radio wave intensity from -d, a non-demodulable point distribution F (T1) is created.

  Next, the determination unit 52 detects wideband electromagnetic noise by comparing the non-demodulable spot distribution F (T1) with a predetermined threshold value. That is, the determination unit 52 determines that broadband electromagnetic noise is generated at the non-demodulable point when the total area of the non-demodulable point is larger than a predetermined threshold. Based on such determination, the determination unit 52 creates a distribution indicating the presence or absence of broadband electromagnetic noise.

  As described above, in the present embodiment, a non-demodulable spot distribution is created based on transmission / reception state information, position information, and demodulator availability information for each wireless terminal device, and this non-demodulable spot distribution is compared with a threshold value. Thus, it is possible to distinguish between locally disturbing radio waves and wide-band electromagnetic noises generated in a wide range, and the same effect as in the second embodiment can be obtained.

  In the third embodiment, the determination unit 52 of the statistical processing device 5 uses the current non-demodulable point distribution created by the statistical processing unit 50 and the past non-demodulable point distribution stored in the storage unit 51. It is also possible to perform a calculation process for each same cell and create a displacement distribution of the points that cannot be demodulated for each cell. The calculation process at this time may be a subtraction process for obtaining a difference between the non-demodulable point distributions. In this case, when the total area of the displacement distribution of the non-demodulable point is larger than a predetermined threshold, the determining unit 52 determines that broadband electromagnetic noise is generated at the non-demodulable point.

  Further, the determination unit 52 determines whether the total area of the non-demodulable points or the total area of the displacement distribution of the non-demodulable points is larger than a predetermined threshold, If the density of the wireless terminal device divided by the predetermined area of the predetermined area or the predetermined area of the displacement distribution of the non-demodulable point is larger than the predetermined number threshold, it is determined that broadband electromagnetic noise is generated at the non-demodulable point. May be. By introducing the number threshold in this way, it is possible to exclude the case where the number of the wireless terminal devices 1 existing in the non-demodulable point is small, that is, the case where the detection accuracy is low. Accuracy can be improved.

  In the second and third embodiments, communication between the radio terminal device 1 and the radio base station 2 is performed using a plurality of radio frequencies, and transmission / reception status information for each radio terminal device is obtained for the plurality of radio frequencies. You may do it. At this time, the radio waves from the wireless terminal device 1 include reception signals RS of a plurality of radio frequencies as shown in FIG. If the non-demodulable point distribution is created using the transmission / reception state information for each radio frequency, the detection accuracy of the broadband electromagnetic noise can be improved.

In the first to third embodiments, the transmission / reception state information includes the received radio wave intensity and the demodulation availability information. However, the radio wave arrival time difference, the bit error rate, and the S / N ratio are used as the transmission / reception state information. It may be.
In the first to third embodiments, a mobile phone has been described as an example of the wireless terminal device 1. However, the present invention is not limited to this, and a desired period and position are fixed as the wireless terminal device 1. You may use the terminal device made.

  The present invention can be applied to a wireless information collection system.

It is a block diagram which shows the structure of the radio | wireless information collection system used as the 1st Embodiment of this invention. It is a block diagram which shows the structural example of the radio base station in the 1st Embodiment of this invention. It is a block diagram which shows the structural example of the statistical processing apparatus in the 1st Embodiment of this invention. It is a figure which shows one example of the received radio wave intensity distribution memorize | stored in the memory | storage part of the statistical processing apparatus in the 1st Embodiment of this invention. It is a figure which shows an example of the received radio wave intensity distribution of the present time which the statistical processing part of the statistical processing apparatus in the 1st Embodiment of this invention produced. It is a figure which shows one example of the displacement distribution of the received radio wave intensity | strength in the 1st Embodiment of this invention. It is a figure which shows one example of the received radio wave intensity distribution produced for every cell in the 1st Embodiment of this invention. It is a figure for demonstrating operation | movement in the case of receiving the electromagnetic wave from a radio | wireless terminal apparatus in several radio base stations. It is a figure which shows an example of the frequency characteristic of the received radio wave intensity in a wireless base station when a broadband electromagnetic noise generate | occur | produces. It is a figure which shows the other example of the frequency characteristic of the received radio wave intensity in a wireless base station when broadband electromagnetic noise generate | occur | produces. It is a figure which shows an example of the received radio wave intensity distribution memorize | stored in the memory | storage part of the statistical processing apparatus in the 3rd Embodiment of this invention. It is a figure which shows an example of the non-demodulable spot distribution which the determination part of the statistical processing apparatus in the 3rd Embodiment of this invention produced. It is a figure which shows one example of the frequency characteristic of the received radio wave intensity in the radio base station in the case of using a plurality of radio frequencies.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Wireless terminal device, 2 ... Wireless base station, 3 ... Mobile communication switching center, 4 ... Location database, 5 ... Statistical processing device, 6 ... Public network, 7 ... Cell, 20 ... Antenna, 21 ... Reception part, 22 ... Transmission unit, 23 ... Radio wave state acquisition unit, 50 ... Statistical processing unit, 51 ... Storage unit, 52 ... Determination unit.

Claims (9)

A plurality of wireless terminal devices;
A wireless base station that communicates with the wireless terminal device and acquires transmission / reception state information indicating a transmission / reception state with the wireless terminal device for each wireless terminal device;
Position information acquisition means for acquiring position information of each wireless terminal device;
Based on the transmission / reception state information for each wireless terminal apparatus acquired by the wireless base station and the position information for each wireless terminal apparatus acquired by the position information acquisition unit, the wireless terminal apparatus and the wireless base station can communicate with each other. It possesses a distribution creation means for creating a communication failure distribution indicating a two-dimensional arrangement of the communication failure in the area,
The distribution creating means includes
A statistical processing unit that creates a transmission / reception state distribution indicating the state of the transmission / reception state in the communicable area from the transmission / reception state information and position information for each wireless terminal device;
A determination unit that creates the communication failure distribution based on the transmission / reception state distribution;
The transmission / reception state information includes radio wave demodulation propriety information received from the wireless terminal device,
The statistical processing unit creates a non-demodulable point distribution indicating non-demodulable points in the communicable area as the transmission / reception state distribution,
When the total area of the non-demodulable points is larger than a predetermined threshold, the determination unit determines that wide-band electromagnetic noise is generated at the non-demodulable points, and distributes the distribution indicating presence / absence of the wide-band electromagnetic noises. A wireless information collection system created as a communication failure distribution . The wireless information collection system according to claim 1,
The determination unit is a wireless terminal device in which the total area of the non-demodulable points is larger than a predetermined threshold value and the number of wireless terminal devices existing in the non-demodulable points is divided by the predetermined area of the non-demodulable points A wireless information collecting system , wherein when the density of the signal is larger than a predetermined number threshold, it is determined that broadband electromagnetic noise is generated . A plurality of wireless terminal devices;
A wireless base station that communicates with the wireless terminal device and acquires transmission / reception state information indicating a transmission / reception state with the wireless terminal device for each wireless terminal device;
Position information acquisition means for acquiring position information of each wireless terminal device;
Based on the transmission / reception state information for each wireless terminal apparatus acquired by the wireless base station and the position information for each wireless terminal apparatus acquired by the position information acquisition unit, the wireless terminal apparatus and the wireless base station can communicate with each other. A distribution creating means for creating a communication failure distribution indicating a two-dimensional arrangement of communication failures in the area;
The distribution creating means includes
A statistical processing unit that creates a transmission / reception state distribution indicating the state of the transmission / reception state in the communicable area from the transmission / reception state information and position information for each wireless terminal device;
A storage unit for storing the transmission / reception state distribution;
A displacement distribution indicating the displacement of the transmission / reception state in the communicable area is created from the current transmission / reception state distribution created by the statistical processing unit and the past transmission / reception state distribution stored in the storage unit, and the displacement distribution is And a determination unit that creates the communication failure distribution based on
The transmission / reception state information includes radio wave demodulation propriety information received from the wireless terminal device,
The statistical processing unit creates a non-demodulable point distribution indicating non-demodulable points in the communicable area as the transmission / reception state distribution,
The determination unit creates a displacement distribution of non-demodulable points in the communicable area from the current non-demodulable point distribution created by the statistical processing unit and the past non-demodulable point distribution stored in the storage unit, When the total area of the displacement distribution of the non-demodulable point is larger than a predetermined threshold, it is determined that broadband electromagnetic noise is generated at the non-demodulable point, and the distribution indicating the presence or absence of the broadband electromagnetic noise is determined as the communication failure. A wireless information collection system characterized by being created as a distribution . The wireless information collection system according to claim 3 ,
The determination unit is configured such that a total area of the displacement distribution at the non-demodulable point is larger than a predetermined threshold and the number of wireless terminal devices existing in the non-demodulable point is a predetermined area of the displacement distribution at the non-demodulable point. A wireless information collecting system , wherein when the density of wireless terminal devices divided by 1 is larger than a predetermined number threshold, it is determined that broadband electromagnetic noise is generated . A plurality of wireless terminal devices;
A wireless base station that communicates with the wireless terminal device and acquires transmission / reception state information indicating a transmission / reception state with the wireless terminal device for each wireless terminal device;
Position information acquisition means for acquiring position information of each wireless terminal device;
Based on the transmission / reception state information for each wireless terminal apparatus acquired by the wireless base station and the position information for each wireless terminal apparatus acquired by the position information acquisition unit, the wireless terminal apparatus and the wireless base station can communicate with each other. A distribution creating means for creating a communication failure distribution indicating a two-dimensional arrangement of communication failures in the area;
The distribution creating means includes
A statistical processing unit that creates a transmission / reception state distribution indicating the state of the transmission / reception state in the communicable area from the transmission / reception state information and position information for each wireless terminal device;
A storage unit for storing the transmission / reception state distribution;
A displacement distribution indicating the displacement of the transmission / reception state in the communicable area is created from the current transmission / reception state distribution created by the statistical processing unit and the past transmission / reception state distribution stored in the storage unit, and the displacement distribution is And a determination unit that creates the communication failure distribution based on
The transmission / reception state information includes information on received radio wave intensity,
The statistical processing unit creates a received radio wave intensity distribution as the transmission / reception state distribution,
The determination unit creates a displacement distribution of the received radio wave intensity in the communicable area from the current received radio wave intensity distribution created by the statistical processing unit and the past received radio wave intensity distribution stored in the storage unit, When there is a point where the displacement of the received radio wave intensity is negative and the state where the absolute value of the displacement is greater than a predetermined threshold continues for a predetermined time, broadband electromagnetic noise is generated at this point. A wireless information collection system that determines and creates a distribution indicating the presence or absence of the broadband electromagnetic noise as the communication failure distribution . In the radio | wireless information collection system of any one of Claims 1 thru | or 5 ,
The position information acquisition unit specifies the position of the wireless terminal device through communication between the wireless terminal device and at least one of the wireless base stations, and acquires the position information . In the radio | wireless information collection system of any one of Claims 1 thru | or 5 ,
The position information acquisition unit acquires the position information transmitted from the wireless terminal device via the wireless base station . In the radio | wireless information collection system of any one of Claims 1 thru | or 7 ,
The radio base station obtains the transmission / reception state information for a plurality of radio frequencies . In the radio | wireless information collection system of any one of Claims 1 thru | or 8 ,
A plurality of the radio base stations are arranged in the communicable area,
The distribution creation means creates the communication failure distribution for each radio base station .

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