JP2018155630A - Transmitter detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an area in which a radio signal from a transmitter cannot be detected without requiring a large number of receivers. SOLUTION: A transmitter detection device 10 is a first received information based on a radio signal from a mobile tag received by a mobile terminal, and a radio signal from a fixed tag provided corresponding to the receiver. , The second received information based on the radio signal from the first fixed tag received before the reception of the radio signal from the mobile tag and from the second fixed tag received after the reception of the radio signal from the mobile tag. The first fixed tag is based on the acquisition unit that acquires the third reception information based on the radio signal and the first, second, and third reception times included in the first, second, and third reception information, respectively. The location position of the moving tag belongs to either the first area composed of the first receiver corresponding to the above and the second area composed of the second receiver corresponding to the second fixed tag. It is provided with a determination unit for determining. [Selection diagram] Fig. 1

Description

  The present invention relates to a transmitter detector.

  A wireless beacon transmitter is arranged in a mobile unit, a relay unit that receives a beacon signal is arranged in a predetermined area, and identification information is extracted from the beacon signal received by the relay unit to manage information on the position of the mobile unit The technique to do is known (for example, refer patent document 1).

JP 2017-004374 A

  For example, in a system that detects the position of a wireless tag when a receiver receives a wireless signal from a wireless tag (transmitter) exemplified by a BLE (Bluetooth Low Energy) tag (Bluetooth is a registered trademark), The range (reception area) in which the position of the wireless tag can be detected is defined by the receivable distance of the wireless signal defined according to the strength of the wireless signal from the tag. Alternatively, the reception area may be defined according to the reach of the radio signal transmitted by the receiver in response to reception of the radio signal from the radio tag. When the area in which the receiver is arranged is represented on a two-dimensional plane, the reception area constituted by one receiver is generally substantially circular. Therefore, in order to prevent an area where the position of the wireless tag cannot be detected from occurring, it is necessary to make the distance between the receivers so close that the respective reception areas overlap. However, in order to arrange such a receiver, a very large number of receivers are required.

  Therefore, the present invention has been made in view of the above problems, and can reduce the area where it is impossible to detect a radio signal from a transmitter without requiring a large number of receivers. An object is to provide a transmitter detector.

  In order to solve the above-mentioned problem, a transmitter detector according to an embodiment of the present invention is a transmitter attached to a movable mobile body among transmitters that transmit a radio signal including identification information of a transmitter. It is a transmitter detection device that detects the location of a mobile transmitter when the wireless signal of the mobile transmitter is not detected by the receiver that receives the wireless signal from the transmitter, and can receive the wireless signal An acquisition unit for acquiring, from a mobile terminal, reception information including identification information and reception time of a transmitter received by the mobile terminal, the first reception information based on a radio signal from the mobile transmitter, A radio signal from a fixed transmitter, which is a transmitter provided corresponding to a position, received by a mobile terminal that has received the radio signal from the mobile transmitter before receiving the radio signal from the mobile transmitter From the first fixed transmitter Obtaining second reception information based on a line signal and third reception information based on a radio signal from a second fixed transmitter, which the mobile terminal has received after receiving the radio signal from the mobile transmitter And the location of the mobile transmitter can receive a radio signal from the transmitter based on the first, second and third reception times included in the first and second reception information. First area constituted by a first receiver corresponding to the first fixed transmitter and a second area constituted by a second receiver corresponding to the second fixed transmitter And a determination unit that determines that it belongs to any of the above.

  According to the above aspect, the mobile terminal that can receive the radio signal from the transmitter is sequentially received based on the radio signals of the first fixed transmitter, the mobile transmitter, and the second fixed transmitter that are sequentially received. 2, first and third received information is acquired. And based on the reception time of the radio signal contained in the 1st-3rd reception information, the location where a mobile transmitter is located is the 1st constituted by the 1st receiver corresponding to the 1st fixed transmitter. And the second area constituted by the second receiver corresponding to the second fixed transmitter. Therefore, even if the radio signal of the mobile transmitter is not detected by the receiver, it is detected that the location of the mobile transmitter belongs to one of the first and second areas. Areas that are impossible to do are reduced.

  Without requiring a large number of receivers, it is possible to reduce areas where it is impossible to detect a radio signal from a transmitter.

It is a figure which shows the apparatus structure of the transmitter detection system containing the transmitter detection apparatus which concerns on this embodiment. It is a figure for demonstrating the subject solved by the transmitter detection apparatus of this embodiment. It is a block diagram which shows the functional structure of a transmitter detection apparatus. 2 is a block diagram showing a functional configuration of a mobile terminal 20. FIG. It is a hardware block diagram of a transmitter detector. It is a figure which shows the example of the structure of the tag classification table, and the data stored. It is a figure which shows the example of a structure of the received information storage part, and the data stored. It is a figure for demonstrating the example of the detection of the movement tag by the transmitter detection apparatus in this embodiment. It is a flowchart which shows the processing content of the transmitter detection method of this embodiment. It is a figure which shows typically the area where the some receiver is arrange | positioned. It is a figure which shows typically the structure of the tag location area determination result memory | storage part, and the data memorize | stored. It is a figure which shows the state where the reception area was expanded in the area. It is a flowchart which shows the processing content of the method of the change of the reception area of this embodiment. It is a figure which shows the structure of a transmitter detection program.

  An embodiment of a transmitter detection device according to the present invention will be described with reference to the drawings. If possible, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a diagram illustrating a device configuration of a transmitter detection system 1 including a transmitter detection device 10 according to the present embodiment. As shown in FIG. 1, the transmitter detection system 1 includes a transmitter detection device 10, a mobile terminal 20, and a receiver 30. The transmitter detection device 10, the mobile terminal 20 and the receiver 30 can communicate with each other via the network N. In FIG. 1, three receivers 30A, 30B, and 30C are shown, but the number of receivers is not limited. Further, the number of mobile terminals 20 is not limited to one as shown in FIG.

  In the present embodiment, the transmitter detection device 10 is a mobile tag (moving) that is a wireless tag attached to a movable body among wireless tags (transmitters) that transmit wireless signals (for example, beacon signals). Detect the location of the transmitter. The wireless tag is a device that transmits a wireless signal including identification information of the wireless tag, and is exemplified by a BLE (Bluetooth Low Energy) tag (Bluetooth is a registered trademark; the same applies hereinafter).

  The mobile terminal 20 is a movable terminal device, and may be, for example, a portable personal computer, or a portable terminal such as a high-function mobile phone (smart phone) or a mobile phone. In the present embodiment, the mobile terminal 20 has a function of a receiver that can receive a radio signal from a radio tag. The receiver 30 is a device that receives a radio signal from a radio tag.

  FIG. 2 is a diagram for explaining a problem solved by the transmitter detection device 10 of the present embodiment. As shown in FIG. 2, a plurality of receivers 30A and 30B are arranged in the area in order to detect the location of the mobile tag TM located in a certain area.

  The receivers 30A and 30B constitute reception areas AA and AB, which are areas where radio signals from the radio tag can be received, respectively. That is, when a wireless tag exists in the reception area AA, the receiver 30A can receive a wireless signal from the wireless tag.

  The reception area is defined by the arrival distance of the radio signal transmitted by the receiver in response to reception of the radio signal from the radio tag. As shown in FIG. 2, the area where the receiver is arranged is two-dimensional. The reception area is substantially circular when represented on the plane. As illustrated in FIG. 2, when the receivers 30 are arranged in the area with a certain interval, there may be a region that is not included in the reception area and cannot detect the wireless tag. Since the location of the mobile tag TM is not included in any of the reception areas AA and AB, neither the receiver 30A nor the receiver 30B can receive a radio signal from the mobile tag TM. The transmitter detector 10 of the present embodiment detects the location of the mobile tag TM when the radio signal from the mobile tag TM is not detected by the receiver 30.

  FIG. 3 is a block diagram illustrating a functional configuration of the transmitter detection device 10. As shown in FIG. 3, the transmitter detection device 10 functionally includes an acquisition unit 11, a determination unit 12, a totaling unit 13, an area changing unit 14, and an instruction unit 15. Further, the transmitter detection device 10 can access storage units such as the tag type table 16, the reception information storage unit 17, and the tag location area determination result storage unit 18. As shown in FIG. 3, these storage units 16, 17, and 18 may be configured as a storage device that can communicate with the transmitter detection device 10, or may be configured inside the transmitter detection device 10. Good. In addition, each function part of the transmitter detector 10 will be described in detail later.

  FIG. 4 is a block diagram showing a functional configuration of the mobile terminal 20. As illustrated in FIG. 4, the mobile terminal 20 includes a reception unit 21 and a reception information transmission unit 22. The receiving unit 21 receives a wireless signal from the wireless tag. As described above, since the wireless signal includes identification information of the transmission source wireless tag, the receiving unit 21 receives the identification information of the wireless tag included in the wireless signal. The reception information transmission unit 22 transmits the reception information including the identification information of the wireless tag received by the reception unit 21 and the reception time when the wireless signal is received to the transmitter detection device 10.

  Note that the block diagrams shown in FIGS. 3 and 4 show functional unit blocks. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one device physically and / or logically coupled, and two or more devices physically and / or logically separated may be directly and / or indirectly. (For example, wired and / or wireless) and may be realized by these plural devices.

  For example, the transmitter detection device 10 according to an embodiment of the present invention may function as a computer. FIG. 5 is a diagram illustrating an example of a hardware configuration of the transmitter detection device 10 according to the present embodiment. The transmitter detection device 10 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Also, the mobile terminal 20 shown in FIG. 4 may be configured as a computer device, similar to the transmitter detection device 10.

  In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configuration of the transmitter detection device 10 may be configured to include one or a plurality of devices illustrated in FIG. 5 or may be configured not to include some devices.

  Each function in the transmitter detection device 10 reads predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculation, and communication by the communication device 1004, This is realized by controlling reading and / or writing of data in the storage 1003.

  For example, the processor 1001 controls the entire computer by operating an operating system. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the functional units 11 to 14 illustrated in FIG. 1 may be realized by the processor 1001.

  Further, the processor 1001 reads a program (program code), software module, and data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the functional units 11 to 14 of the transmitter detection device 10 may be realized by a control program stored in the memory 1002 and operating on the processor 1001. Although the above-described various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

  The memory 1002 is a computer-readable recording medium and includes, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. May be. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to implement the wireless communication method according to the embodiment of the present invention.

  The storage 1003 is a computer-readable recording medium such as an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray (Registered trademark) disk, smart card, flash memory (for example, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. The storage 1003 may be referred to as an auxiliary storage device. The storage medium described above may be, for example, a database, server, or other suitable medium including the memory 1002 and / or the storage 1003.

  The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like.

  The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, or the like) that accepts an external input. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

  Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.

  The transmitter detection device 10 includes hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). A part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.

  With reference to FIG. 3 again, each function part of the transmitter detector 10 will be described. The acquisition unit 11 acquires from the mobile terminal 20 reception information including the identification information and reception time of the wireless tag received by the mobile terminal 20. The acquisition unit 11 refers to the tag type table 16, acquires the type of the wireless tag related to the reception information, and stores the reception information in the reception information storage unit 17.

  The tag type table 16 is a storage unit that stores in advance a tag type associated with identification information of a wireless tag. FIG. 6 is a diagram illustrating a configuration of the tag type table 16 and an example of stored data. As shown in FIG. 6, the tag type table 16 corresponds to a mobile tag and a receiver 30 that are wireless tags attached to a mobile object in association with a tag ID that is identification information of the wireless tag. The tag type (moving / fixing) information indicating which one of the fixed tags is provided is stored. Further, the tag ID of the fixed tag is associated with information on the corresponding receiver, which is identification information of the corresponding receiver.

  The reception information storage unit 17 is a storage unit that stores the reception information acquired by the acquisition unit 11. FIG. 7 is a diagram illustrating a configuration of the reception information storage unit 17 and an example of stored data. As illustrated in FIG. 7, the reception information storage unit 17 associates a mobile terminal ID, a tag ID, a tag type, and a serial number “No.” sequentially attached to the acquired reception information with each other. A detection time that is a time at which the radio signal related to the reception information is received by the mobile terminal 20 is associated and stored.

  The determination unit 12 determines an area to which the location of the moving tag TM belongs. Specifically, the determination unit 12 determines whether the area where the moving tag TM is located is a reception area constituted by any one of the receivers 30.

  The totaling unit 13 totals the determination results of the area to which the moving tag TM is located by the determination unit 12.

  The tag location area determination result storage unit 18 is a storage unit that stores a determination result of an area to which the location of the mobile tag TM belongs, based on a radio signal from the mobile tag TM received by the mobile terminal 20.

  The area changing unit 14 determines that the receiver 30 is changed to expand or reduce the reception area in which the wireless signal from the wireless tag can be received.

  The instruction unit 15 transmits an instruction to change the area determined by the area changing unit 14 to the receiver 30.

  With reference to FIG. 8, the determination of the area to which the moving tag TM belongs will be described more specifically. FIG. 8 is a diagram for explaining an example of detection of the moving tag TM by the transmitter detection device 10 according to the present embodiment. In the example shown in FIG. 8, similarly to the example shown in FIG. 2, receivers 30A and 30B are arranged in a certain predetermined area PA. The receiver 30A constitutes a reception area AA that can receive a wireless signal from the wireless tag. The receiver 30B constitutes a reception area AB.

  As shown in FIG. 8, since the location of the mobile tag TM is not included in any of the reception areas AA and AB, neither the receiver 30A nor the receiver 30B can receive a radio signal from the mobile tag TM. .

  Fixed tags TA and TB are provided at the positions of the receivers 30A and 30B, respectively. That is, the fixed tag TA (fixed transmitter) is a wireless tag provided corresponding to the position of the receiver 30A. The fixed tag TB (fixed transmitter) is a wireless tag provided corresponding to the position of the receiver 30B.

  In the example described with reference to FIG. 8, it is assumed that the tag ID for identifying the fixed tag TA is “AAA”, and the tag ID for identifying the fixed tag TB is “BBB”. Further, it is assumed that the tag ID for identifying the moving tag TM is “XXX”. These tag IDs and tag types are stored in advance as shown in FIG.

FIG. 8 shows the mobile terminals 20 (20 ₁ , 20 ₂ , 20 ₃ ) in a situation where the receivers 30A, 30B, etc. are arranged in this way and the radio signal from the mobile tag TM is not detected by the receivers 30A, 30B. Represents a state of moving in the area PA as indicated by an arrow r.

Mobile terminal 20 ₁ of the moving constitutes the reception area AM ₁ capable of receiving a radio signal of the radio tag. Since the fixed tag TA is included in the receiving area AM _1, the receiving unit 21 of the mobile terminal 20 ₁ receives a radio signal from the fixed tag TA, receives the tag ID "AAA" identifies a fixed tag TA. Receiving information transmitting section 22 of the mobile terminal 20 ₁ is transmitted to the transmitter sensing device 10 as reception information tag ID "AAA" of the fixed tags TA with the reception time of the radio signal.

  When the acquisition unit 11 of the transmitter detection device 10 acquires the reception information (second reception information), the tag type “fixed” information associated with the tag ID “AAA” is referred to the tag type table 16 with reference to the tag type table 16. To get. Then, the acquisition unit 11 associates the received tag ID “AAA” with the mobile terminal ID “S” of the mobile terminal 20, the tag type “fixed”, and the detection time “10:00” when the radio signal is received. It is stored in the received information storage unit 17 as “No. 1”.

Mobile terminal 20 ₂ in the mobile constitutes a receivable reception area AM ₂ wireless signal of the wireless tag. Since the mobile tag TM is included in the receiving area AM _2, the receiving unit 21 of the mobile terminal 20 ₂ receives a radio signal from the mobile tag TM, receives the tag ID "XXX" identifies the mobile tag TM. Receiving information transmitting section 22 of the mobile terminal 20 ₂ sends to the transmitter sensing device 10 as reception information tag ID "XXX" of the mobile tag TM with the reception time of the radio signal.

  When the acquisition unit 11 of the transmitter detection device 10 acquires the reception information (first reception information), the tag type “movement” information associated with the tag ID “XXX” is referred to the tag type table 16 with reference to the tag type table 16. To get. The acquisition unit 11 associates the received tag ID “XXX” with the mobile terminal ID “S” of the mobile terminal 20, the tag type “move”, and the detection time “10:02” when the radio signal is received. It is stored in the received information storage unit 17 as “No. 2”.

The moving mobile terminal 20 ₃ configures a reception area AM ₃ that can receive the radio signal of the radio tag. Since the fixed tag TB are included in the reception area AM _3, the receiving unit 21 of the mobile terminal 20 ₃ receives the radio signals from the fixed tag TB, receives the tag ID "BBB" identifies a fixed tag TB. Receiving information transmitting section 22 of the mobile terminal 20 ₃ transmits the transmitter sensing device 10 as reception information tag ID "BBB" of the fixed tag TB with the reception time of the radio signal.

  When the acquisition unit 11 of the transmitter detector 10 acquires the reception information (third reception information), the tag type “fixed” information associated with the tag ID “BBB” is referred to the tag type table 16 with reference to the tag type table 16. To get. Then, the acquisition unit 11 receives the mobile terminal ID “S”, the tag type “fixed”, and the detection time “10:10” at which the radio signal is received in association with the received tag ID “BBB” as reception information. It is stored in the received information storage unit 17 as “No. 3”.

  That is, the acquisition unit 11 receives the fixed information received based on the radio signal from the mobile tag TM and the mobile terminal 20 that has received the radio signal from the mobile tag TM before receiving the radio signal from the mobile tag TM. The reception information based on the radio signal from the tag TA and the reception information based on the radio signal from the fixed tag TB received after the mobile terminal 20 receives the radio signal from the mobile tag TM are acquired.

  The determination unit 12 receives the reception information “No. 2” based on the radio signal from the mobile tag TM, the reception information “No. 1” based on the radio signal from the fixed tag TA, and the reception based on the radio signal from the fixed tag TB. Based on the consultation time included in each of the information “No. 3”, the location of the moving tag TM is a reception area AA (first area) constituted by the receiver 30A (first receiver) and reception. It belongs to one of the reception areas AB (second area) constituted by the device 30B (second receiver).

  Specifically, the determination unit 12 receives the reception time (second reception time) when the mobile terminal 20 receives the radio signal from the fixed tag TA and the reception time when the mobile terminal 20 receives the radio signal from the mobile tag TM. From the interval with (first reception time), the reception time when the mobile terminal 20 receives a radio signal from the mobile tag TM and the reception time when the mobile terminal 20 receives a radio signal from the fixed tag TB (third reception) If the time interval is long, it is determined that the location of the moving tag TM belongs to the reception area AA.

  On the other hand, the determination unit 12 moves the mobile terminal 20 based on the interval between the reception time when the mobile terminal 20 receives the radio signal from the fixed tag TA and the reception time when the mobile terminal 20 receives the radio signal from the mobile tag TM. When the interval between the reception time when the radio signal from the tag TM is received and the reception time when the mobile terminal 20 receives the radio signal from the fixed tag TB is short, the location of the mobile tag TM belongs to the reception area AB. judge.

  Note that the interval between the reception time at which the mobile terminal 20 receives the radio signal from the fixed tag TA and the reception time at which the mobile terminal 20 receives the radio signal from the mobile tag TM, and the radio from the mobile tag TM by the mobile terminal 20 When the interval between the reception time when the signal is received and the reception time when the mobile terminal 20 receives the radio signal from the fixed tag TB is the same, the determination unit 12 determines that the location of the mobile tag TM is within the reception area AA. It may be determined that the data belongs to the reception area AB.

  When the reception information as illustrated in FIG. 7 is acquired, the determination unit 12 receives the reception time “10:00” of the reception information “No. 1” and the reception time “10: 10” of the reception information “No. 2”. From the interval “2 minutes” to “02”, the interval “8 minutes” between the reception time “10:02” of the reception information “No. 2” and the reception time “10:10” of the reception information “No. 3” is Since it is long, it is determined that the location of the moving tag TM belongs to the reception area AA.

  As described above, when the mobile terminal 20 sequentially receives the radio signals of the fixed tag TA, the mobile tag TM, and the fixed tag TB, the mobile terminal 20 was received at the reception time closer to the reception time of the radio signal from the mobile tag TM. The determination is performed as described above in view of the high possibility that the mobile tag TM is located at a position closer to the fixed tag of the wireless signal source. Accordingly, the area to which the location of the moving tag TM belongs is appropriately determined.

  When the interval between the reception time when the mobile terminal 20 receives the radio signal from the mobile tag TM and the reception time when the mobile terminal 20 receives the radio signal from the fixed tag TB exceeds a predetermined time, the determination unit 12 The determination of the area to which the location of the moving tag TM belongs may not be performed. When the interval between the reception time when the mobile terminal 20 receives the radio signal from the mobile tag TM and the reception time when the mobile terminal 20 receives the radio signal from the fixed tag TB is longer than a predetermined time, the fixed tag Since there is a high possibility that the TB is located far from the position of the mobile tag TM, there is a high possibility that the location of the mobile tag TM cannot be determined appropriately. In such a case, the determination of the location of the moving tag TM is not performed, thereby preventing erroneous determination. In addition, although the predetermined time regarding the interval of reception time can be set arbitrarily, it can be 10 minutes, for example.

  When the interval between the reception time when the mobile terminal 20 receives the radio signal from the fixed tag TA and the reception time when the mobile terminal 20 receives the radio signal from the mobile tag TM exceeds the predetermined time, the determination unit 12 The determination of the area to which the location of the moving tag TM belongs may not be performed. If the interval between the reception time when the mobile terminal 20 receives the radio signal from the fixed tag TA and the reception time when the mobile terminal 20 receives the radio signal from the mobile tag TM is longer than a predetermined time, the fixed tag Since there is a high possibility that the TA is located far from the position of the mobile tag TM, there is a high possibility that the location of the mobile tag TM cannot be determined appropriately. In such a case, the determination of the location of the moving tag TM is not performed, thereby preventing erroneous determination.

  Next, a transmitter detection method in the transmitter detection device 10 will be described with reference to FIG. FIG. 9 is a flowchart showing the processing contents of the transmitter detection method of the present embodiment.

  In step S1, the acquisition unit 11 determines whether or not reception information indicating that the mobile terminal 20 has received the radio signal of the first fixed tag has been acquired. The process of step S1 is repeated until it is determined that the reception information indicating that the wireless signal of the first fixed tag has been received is acquired. When it is determined that the reception information indicating that the wireless signal of the first fixed tag has been received is obtained, the process proceeds to step S2.

  In step S <b> 2, the acquisition unit 11 acquires reception information (second reception information) including a reception time T <b> 1 when the mobile terminal 20 receives the radio signal of the first fixed tag.

  In step S <b> 3, the acquisition unit 11 determines whether or not reception information indicating that the mobile terminal 20 has received the radio signal of the mobile tag TM within a predetermined time has been acquired. When it is determined that the reception information indicating that the mobile terminal 20 has received the radio signal of the mobile tag TM has been acquired, the process proceeds to step S4. On the other hand, when the predetermined time has elapsed without acquiring the reception information indicating that the mobile terminal 20 has received the radio signal of the mobile tag TM, the process returns to step S1. Note that even when reception information indicating that a wireless signal of a fixed tag other than the first fixed tag has been received within a predetermined time is obtained, the process returns to step S1, and the other fixed tag is connected to the first fixed tag. Processing continues as a tag.

  In step S4, the acquisition unit 11 acquires reception information (first reception information) including a reception time T2 when the mobile terminal 20 receives the radio signal of the mobile tag TM.

  In step S5, the acquisition unit 11 determines whether or not reception information indicating that the mobile terminal 20 has received the radio signal of the second fixed tag has been acquired. When it is determined that the reception information indicating that the mobile terminal 20 has received the radio signal of the second fixed tag has been acquired, the process proceeds to step S7. On the other hand, if it is not determined that the reception information indicating that the mobile terminal 20 has received the radio signal of the second fixed tag has been acquired, the process proceeds to step S6.

  In step S6, it is determined whether or not a predetermined time has elapsed. If it is determined that the predetermined time has elapsed, the process ends without determining the location of the moving tag TM. On the other hand, if it is not determined that the predetermined time has elapsed, the process returns to step S5.

  In step S7, the acquisition unit 11 acquires reception information (third reception information) including a reception time T3 when the mobile terminal 20 receives the radio signal of the second fixed tag.

  In step S8, the determination unit 12 includes first reception information based on a radio signal from the mobile tag TM, second reception information based on a radio signal from the first fixed tag, and a radio signal from the second fixed tag. Based on the reception times T2, T1, T3 included in each of the third reception information based on, the area to which the location of the movement tag TM belongs is determined. Specifically, the length of the interval from the reception time T1 of the first fixed tag to the reception time T2 of the mobile tag TM and the interval from the reception time T2 of the movement tag TM to the reception time T3 of the second fixed tag are short and long. In order to determine the relationship, for example, it is determined whether or not the relationship of (reception time T1 + reception time T3)> (reception time T2 × 2) is established.

  When the relationship of (reception time T1 + reception time T3)> (reception time T2 × 2) is established, the interval between the reception time T2 and the reception time T3 is longer than the interval between the reception time T1 and the reception time T2. The process proceeds to step S9. On the other hand, when the relationship of (reception time T1 + reception time T3)> (reception time T2 × 2) is not established, the interval between the reception time T2 and the reception time T3 is equal to or less than the interval between the reception time T1 and the reception time T2. Therefore, the process proceeds to step S10.

  In step S9, the determination unit 12 determines that the moving tag TM belongs to the area configured by the receiver corresponding to the first fixed tag. On the other hand, in step S10, the determination unit 12 determines that the moving tag TM belongs to an area configured by a receiver corresponding to the second fixed tag. And the determination part 12 outputs the determination result in step S9 or step S10 by making it memorize | store in a predetermined memory | storage part, or displaying on a predetermined display means.

  Next, with reference to FIG. 10 to FIG. 13, processing related to the change of the reception area constituted by the receiver 30 will be specifically described.

  FIG. 10 is a diagram schematically showing an area PA2 where a plurality of receivers are arranged. Receivers 30A, 30B, 30C, and 30D are arranged in area PA2. The receivers 30A, 30B, 30C, and 30D constitute reception areas AA, AB, AC, and AD, which are areas that can receive wireless signals from the wireless tag.

  FIG. 11 is a diagram schematically illustrating the configuration of the tag location area determination result storage unit 18 and the stored data. Based on the fact that the mobile terminal 20 sequentially receives the radio signal from the first fixed tag, the radio signal from the mobile tag TM, and the radio signal from the second fixed tag, the counting unit 13 The position belongs to the first area constituted by the first receiver corresponding to the first fixed tag or the second area constituted by the second receiver corresponding to the second fixed tag. The number of times determined by the determination unit 12 is stored in the tag location area determination result storage unit 18 for each pair of the first area and the second area. The rows and columns of the table shown in FIG. 11 correspond to one and the other of the first area and second area pairs, respectively.

  In the example shown in FIG. 11, the radio signal from the fixed tag corresponding to the receiver 30A constituting the reception area AA, the radio signal from the mobile tag TM, and the fixed tag corresponding to the receiver 30B constituting the reception area AB. This indicates that the number of times that the location of the mobile tag TM is determined to belong to the reception area AA or the reception area AB based on the fact that the mobile terminal 20 sequentially received the radio signals is one.

  The acquisition unit 11 acquires the reception information including the identification information of the wireless tag received by the receiver 30 and the reception time from the receiver 30.

  After the wireless signal from the mobile tag TM is detected by the first receiver or the second receiver (based on the reception information from the receiver 30 acquired by the acquisition unit 11), the area changing unit 14 A radio signal from the mobile tag TM has not been detected by any of the receivers, and a predetermined time or more has passed, and a radio signal from the first fixed tag corresponding to the first receiver, Based on the fact that the mobile terminal 20 sequentially received the radio signal and the radio signal from the second fixed tag corresponding to the second receiver, the location of the mobile tag TM is configured by the first receiver. The first area and the second area are expanded when the number of times determined by the determination unit 12 to be in one area or the second area configured by the second receiver is equal to or greater than a predetermined threshold. Judge that .

  The determination of area expansion will be specifically described. In the area PA2 shown in FIG. 10, the mobile body to which the mobile tag TM is attached moves from the left to the right in the figure, and any reception area after the radio signal of the mobile tag TM is detected by the receiver 30B. It is assumed that the mobile tag TM is located at a position that is not included, and that a predetermined time or more has passed without the wireless signal of the mobile tag TM being detected by any receiver. In this case, there is a high possibility that the moving tag TM is located in the vicinity of the reception area AB and not included in any reception area.

  In this case, the area changing unit 14 indicates that the mobile terminal 20 has sequentially received the radio signal from the fixed tag TB corresponding to the receiver 30B, the mobile tag TM, and the fixed tag corresponding to a receiver other than the receiver 30B. The number of times of determination that the moving tag TM belongs to a reception area constituted by any one of the receivers is extracted from the tag location area determination result storage unit 18.

  Specifically, the area changing unit 14 refers to the tag location area determination result storage unit 18, and the location of the moving tag TM is within the pair of the reception area AB and the reception area AA configured by the receiver 30 </ b> B. The number of times determined to belong to any one of the reception areas “1”, the number of times determined to belong to any one of the reception areas AB and the pair of reception areas AC “120”, and the reception area The number of times “100” determined to belong to one of the reception areas of the pair of AB and reception area AD is extracted.

  If the predetermined threshold value regarding the number of determinations is “100”, the area changing unit 14 determines to expand the reception area AB, the reception area AC, and the reception area AD. The degree of expansion of the size of the reception area may be set in advance, for example.

  The instruction unit 15 instructs the receiver 30B, the receiver 30C, and the receiver 30D configuring the reception area AB, the reception area AC, and the reception area AD, which are determined to be expanded by the area changing unit 14, to expand the reception area. Send. FIG. 12 is a diagram illustrating a state where the reception area is expanded in area PA2. As illustrated in FIG. 12, the receiver 30B expands the reception area AB1 before expansion as indicated by the reception area AB2 based on the instruction from the instruction unit 15. Similarly, the receiver 30C expands the reception area AC1 before expansion as indicated by the reception area AC2 based on the instruction from the instruction unit 15. Similarly, based on the instruction from the instruction unit 15, the receiver 30D expands the reception area AD1 before expansion as indicated by the reception area AD2.

  By extending the reception area in this way, the mobile tag TM that was not included in any reception area is included in the reception area AB2 of the reception area AB2, the reception area AC2, and the reception area AD2. Therefore, the movement tag TM can be detected.

  The instruction unit 15 may transmit an instruction to reduce the expanded reception area to the size before the expansion to a receiver 30 configuring the expanded reception area at a predetermined opportunity. The predetermined trigger may be, for example, an event such as detection by any one of the receivers 30 of the mobile tag TM and the passage of a predetermined time.

  Next, with reference to FIG. 13, a method for changing the reception area in the transmitter detection device 10 will be described. FIG. 13 is a flowchart showing the processing contents of the method for changing the reception area according to this embodiment.

  In step S <b> 21, the acquisition unit 11 determines whether or not the reception information indicating that the wireless signal of the mobile tag TM has been received has been acquired from the receiver 30. If it is determined that the reception information indicating that the radio signal of the mobile tag TM has been received is obtained, the process proceeds to step S22. If it is not determined that the reception information indicating that the radio signal of the mobile tag TM has been received is obtained, the process of step S21 is repeated.

  In step S22, the area changing unit 14 determines whether any radio signal of the mobile tag TM determined to have been received in step S21 has not been detected by any receiver 30 for a predetermined time or more. If a predetermined time or more has elapsed without any receiver 30 detecting the radio signal of the mobile tag TM, the process proceeds to step S23. If a radio signal of the mobile tag TM is detected by any of the receivers 30 before the predetermined time has elapsed, the detection is handled as reception information in step S21.

  In step S23, the area changing unit 14 corresponds to the second receiver other than the fixed tag, the moving tag TM, and the first receiver 30 corresponding to the first receiver 30 that has received the reception information in step S21. Based on the fact that the mobile terminal 20 has sequentially received radio signals from the fixed tag, it is determined that the mobile tag TM belongs to a reception area constituted by one of the first and second receivers. Is extracted from the tag location area determination result storage unit 18.

  In step S24, the area changing unit 14 determines whether or not the number of determinations extracted in step S23 is greater than or equal to a predetermined threshold. If it is determined that the number of determinations is greater than or equal to a predetermined threshold, the process proceeds to step S25. On the other hand, if it is not determined that the number of determinations is equal to or greater than a predetermined threshold, the process ends.

  In step S25, the area changing unit 14 determines to expand the reception area configured by the first and second receivers.

  In step S <b> 26, the instruction unit 15 transmits to the first and second receivers instructions to expand the reception areas that each constitutes.

  In step S <b> 27, the instruction unit 15 transmits an instruction to reduce the expanded reception area to the original size to the first and second receivers at a predetermined opportunity.

  Next, a control program for causing a computer to function as the transmitter detection device 10 of the present embodiment will be described. FIG. 14 is a diagram showing the configuration of the transmitter detection program P10.

  The transmitter detection program P10 includes a main module m10, an acquisition module m11, a determination module m12, a counting module m13, an area change module m14, and an instruction module m15 that collectively control transmitter detection processing in the transmitter detection device 10. Composed. And each function for the acquisition part 11, the determination part 12, the total part 13, the area change part 14, and the instruction | indication part 15 in the transmitter detection apparatus 10 is implement | achieved by each module m11-m15. The transmitter detection program P10 may be transmitted through a transmission medium such as a communication line, or may be stored in the recording medium D10 as shown in FIG. .

  In the transmitter detection device 10, transmitter detection method and transmitter detection program P <b> 10 of the present embodiment described above, the first fixed tag sequentially received by the mobile terminal 20 that can receive the radio signal from the transmitter 30. Based on the radio signals of the mobile tag TM and the second fixed tag, the second, first and third reception information is acquired. Then, based on the reception time of the radio signal included in the first to third reception information, the location where the mobile tag TM is located is a first receiver 30 configured by the first receiver 30 corresponding to the first fixed tag. And the second area constituted by the second receiver 30 corresponding to the second fixed tag. Therefore, even if the radio signal of the mobile tag TM is not detected by the receiver 30, it is detected that the location of the mobile tag TM belongs to one of the first and second areas. Areas that cannot be detected are reduced.

  Further, in the transmitter detection device according to another aspect, the determination unit has a longer interval between the first reception time and the third reception time than the interval between the second reception time and the first reception time. Determines that the location of the mobile transmitter belongs to the first area, and determines the interval between the first reception time and the third reception time based on the interval between the second reception time and the first reception time. Is short, it may be determined that the location of the mobile transmitter belongs to the second area.

  According to the above configuration, when the mobile terminal sequentially receives the radio signals of the first fixed transmitter, the mobile transmitter, and the second fixed transmitter, the reception time of the radio signal from the mobile transmitter, and more There is a high possibility that the mobile transmitter is located closer to the fixed transmitter that is the source of the radio signal received at the close reception time. Therefore, the area to which the location of the mobile transmitter belongs is appropriately determined.

  In the transmitter detection device of the present invention, the determination unit determines an area to which the location of the mobile transmitter belongs when the interval between the first reception time and the third reception time exceeds a predetermined time. It is good also as not implementing.

  When the interval between the first reception time and the third reception time is longer than a predetermined time, there is a possibility that the second fixed transmitter is located far from the position of the mobile transmitter. Since it is high, there is a high possibility that the location of the mobile transmitter cannot be determined appropriately. According to the above configuration, since the determination of the location of the mobile transmitter is not performed in such a case, it is possible to prevent erroneous determination.

  In the transmitter detection device of the present invention, the determination unit determines an area to which the location of the mobile transmitter belongs when the interval between the second reception time and the first reception time exceeds a predetermined time. It is good also as not implementing.

  When the interval between the second reception time and the first reception time is longer than a predetermined time, there is a possibility that the first fixed transmitter is located far from the position of the mobile transmitter. Since it is high, there is a high possibility that the location of the mobile transmitter cannot be determined appropriately. According to the above configuration, since the determination of the location of the mobile transmitter is not performed in such a case, it is possible to prevent erroneous determination.

  In the transmitter detection device of the present invention, the acquisition unit further acquires, from a receiver, reception information including identification information and reception time of the transmitter received by the receiver. After a radio signal from the receiver is detected by the first receiver or the second receiver, a radio signal from the mobile transmitter has not been detected by any receiver, and a predetermined time has passed, and Based on the fact that the mobile terminal sequentially receives the radio signal from the first fixed transmitter, the radio signal from the mobile transmitter, and the radio signal from the second fixed transmitter, the location of the mobile transmitter is An area changing unit that determines to expand the first area and the second area when the number of times determined by the determining unit to be in one area or the second area is equal to or greater than a predetermined threshold; 1 receiver and 2nd reception Of each, and an instruction unit that transmits an instruction to expand the first area and the second area may further include a.

  According to the above configuration, the location of the mobile transmitter is based on the fact that the mobile terminal sequentially receives the radio signal from the first fixed transmitter, the radio signal from the mobile transmitter, and the radio signal from the second fixed transmitter. If the number of times the area to which the position belongs is determined to be greater than or equal to a predetermined threshold value, it means that the radio signal from the mobile transmitter is detected not by the receiver but by the mobile terminal. Accordingly, in such a case, there is an area between the first fixed transmitter and the second fixed transmitter where any receiver cannot detect the radio signal from the transmitter. It is highly possible that In such a case, an instruction to expand the first area and the second area is transmitted to each of the first receiver and the second receiver, and the first area and the second area according to the instructions. Therefore, the area where it is impossible to detect the radio signal from the transmitter can be reduced.

  In the transmitter detection device according to another aspect, the instruction unit receives the instruction to reduce the expanded first area and the second area to the size before the expansion at a predetermined timing. It is good also as transmitting to each of a receiver and a 2nd receiver.

  According to the said form, the reduction of the resource required for the expansion of the area for receiving the radio signal from a transmitter, and the prevention in the malfunction in the detection of a transmitter by area duplication are achieved.

  Although the present embodiment has been described in detail above, it will be apparent to those skilled in the art that the present embodiment is not limited to the embodiment described in this specification. The present embodiment can be implemented as a modification and change without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present embodiment.

  Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA. (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), The present invention may be applied to a Bluetooth (registered trademark), a system using another appropriate system, and / or a next generation system extended based on the system.

  As long as there is no contradiction, the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be changed. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

  Information or the like can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

  Input / output information and the like may be stored in a specific location (for example, a memory) or may be managed by a management table. Input / output information and the like can be overwritten, updated, or additionally written. The output information or the like may be deleted. The input information or the like may be transmitted to another device.

  The determination may be performed by a value represented by 1 bit (0 or 1), may be performed by a true / false value (Boolean: true or false), or may be performed by comparing numerical values (for example, a predetermined value) Comparison with the value).

  Each aspect / embodiment described in this specification may be used independently, may be used in combination, or may be switched according to execution. In addition, notification of predetermined information (for example, notification of being “X”) is not limited to explicitly performed, but is performed implicitly (for example, notification of the predetermined information is not performed). Also good.

  Software, whether it is called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc. should be interpreted broadly.

  Also, software, instructions, etc. may be transmitted / received via a transmission medium. For example, software may use websites, servers, or other devices using wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave. When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.

  Information, signals, etc. described herein may be represented using any of a variety of different technologies. For example, data, commands, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these May be represented by a combination of

  Note that the terms described in this specification and / or terms necessary for understanding this specification may be replaced with terms having the same or similar meaning.

  As used herein, the terms “system” and “network” are used interchangeably.

  In addition, information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information. .

  As used herein, the phrase “based on” does not mean “based only on,” unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

  Where the designation "first", "second", etc. is used herein, any reference to that element does not generally limit the amount or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Thus, a reference to the first and second elements does not mean that only two elements can be employed there, or that in some way the first element must precede the second element.

  These terms are similar to the term “comprising” as long as “include”, “including” and variations thereof are used herein or in the claims. It is intended to be comprehensive. Furthermore, the term “or” as used herein or in the claims is not intended to be an exclusive OR.

  In this specification, a plurality of devices are also included unless there is only one device that is clearly present in context or technically.

  Throughout this disclosure, the plural is included unless the context clearly indicates one.

  DESCRIPTION OF SYMBOLS 1 ... Transmitter detection system, 10 ... Transmitter detection apparatus, 11 ... Acquisition part, 12 ... Determination part, 13 ... Total part, 14 ... Area change part, 15 ... Instruction part, 16 ... Tag type table, 17 ... Reception information Storage unit, 18 ... tag location area determination result storage unit, 20 ... mobile terminal, 21 ... receiving unit, 22 ... received information transmitting unit, 30, 30A, 30B, 30C, 30D ... receiver, P10 ... transmitter detection program, m10 ... main module, m11 ... acquisition module, m12 ... determination module, m13 ... aggregation module, m14 ... area change module, m15 ... instruction module.

Claims (6)

Of the transmitters that transmit radio signals including the identification information of the transmission source, the mobile transmitter that is a transmitter attached to the movable body, the receiver that receives the radio signal from the transmitter A transmitter detection device that detects a location when a radio signal of a mobile transmitter is not detected,
An acquisition unit that acquires reception information including identification information and reception time of a transmitter received by the mobile terminal from a mobile terminal capable of receiving the wireless signal, wherein the acquisition unit is a first unit based on the radio signal from the mobile transmitter Received information, a radio signal from a fixed transmitter which is a transmitter provided corresponding to the position of the receiver, and a mobile terminal that has received the radio signal from the mobile transmitter is from the mobile transmitter Second reception information based on the radio signal from the first fixed transmitter received before receiving the radio signal, and the mobile terminal received after receiving the radio signal from the mobile transmitter, An acquisition unit for acquiring third reception information based on a radio signal from the second fixed transmitter;
The location of the mobile transmitter can receive a radio signal from the transmitter based on the first, second and third reception times included in the first, second and third reception information, respectively. And a second area constituted by a second receiver corresponding to the second fixed transmitter and a first area constituted by a first receiver corresponding to the first fixed transmitter. A determination unit that determines to belong to any of the areas;
A transmitter detection device comprising: The determination unit
When the interval between the first reception time and the third reception time is longer than the interval between the second reception time and the first reception time, the location of the mobile transmitter is Determine that it belongs to one area,
When the interval between the first reception time and the third reception time is shorter than the interval between the second reception time and the first reception time, the location of the mobile transmitter is the first It is determined that it belongs to area 2
The transmitter detector according to claim 1. When the interval between the first reception time and the third reception time exceeds a predetermined time, the determination unit does not determine the area to which the location of the mobile transmitter belongs,
The transmitter detector according to claim 2. When the interval between the second reception time and the first reception time exceeds a predetermined time, the determination unit does not determine the area to which the location of the mobile transmitter belongs,
The transmitter detector according to claim 2. The acquisition unit further acquires reception information including identification information and reception time of the transmitter received by the receiver from the receiver,
The transmitter detector is
After a radio signal from a mobile transmitter is detected by the first receiver or the second receiver, a radio signal from the mobile transmitter is detected by any receiver for a predetermined time or more. And the mobile terminal sequentially receives the radio signal from the first fixed transmitter, the radio signal from the mobile transmitter, and the radio signal from the second fixed transmitter, The first area and the second area when the number of times that the determination unit determines that the location of the mobile transmitter belongs to the first area or the second area is greater than or equal to a predetermined threshold value An area changing unit that determines to extend
An instruction unit that transmits an instruction to expand the first area and the second area to each of the first receiver and the second receiver;
The transmitter detection device according to any one of claims 1 to 4. The instructing unit instructs the first receiver and the second receiver to instruct the expanded first area and the second area to a size before expansion at a predetermined opportunity. Send to each,
The transmitter detector according to claim 5.

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