JP2017090245A - Threshold adjustment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut down costs required for the adjustment of a threshold pertaining to the reception strength of a radio wave for determining whether or not a terminal should be associated with a transmitter.SOLUTION: A threshold adjustment device 10 comprises: a display control unit 11 for presenting a determination area defined for each transmitter on the basis of the position and threshold of the transmitter previously set in a prescribed area; an acceptance unit 12 for accepting change input for changing the position and/or threshold of at least one transmitter out of a plurality of transmitters; an adjustment unit 13 for adjusting the threshold of at least one transmitter out of the plurality of transmitters on the basis of the change input so that the determination areas of the plurality of transmitters do not overlap in the prescribed area, or all in the prescribed area are occupied by the determination area; and an output unit 14 for outputting an adjusted threshold. The threshold of each transmitter is adjusted on the basis of a visual change input this way, so that threshold adjustment is easily realized.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a threshold adjustment device.

  In recent years, in order to acquire the position of a user indoors where GPS radio waves cannot be received, attention has been paid to a method of performing position measurement using the radio wave intensity transmitted from a proximity wireless communication device installed indoors. For example, a technique is known in which a signal strength of a radio wave from a beacon station is detected and a beacon station having a high signal strength is determined as a beacon station to be received (see, for example, Patent Document 1).

  In addition, since the radio wave transmitted from the transmitter includes identification information of the transmitter, the terminal identifies the transmitter that is the source of the received radio wave and associates the terminal with the transmitter. Is possible. Then, the node provided with the transmitter can be acquired as the position where the terminal is located. Since the radio wave attenuates according to the distance from the transmission source, when the radio wave from the transmitter is received at the terminal, a threshold value regarding the radio wave reception intensity for determining whether or not to associate the terminal with the transmitter is determined. By setting each, a determination area is defined that is a range in which a terminal that receives a radio wave from a transmitter is associated with the transmitter. That is, it is determined that a terminal in the determination area is located at a transmitter node related to the determination area.

JP 2000-338216 A

  Conventionally, the reception intensity of each place is measured by going around the predetermined area where a plurality of transmitters are provided manually so that the determination areas formed by the plurality of transmitters provided in the predetermined area do not overlap. (Site Survey), threshold values were set for each transmitter based on measurement results. Such measurement of the radio field intensity and setting of the threshold value have been performed by a person with specialized knowledge. For example, when the position of the transmitter is moved, it is necessary to perform a manual site survey again so that the determination region is appropriately set. Such a site survey conducted by those who have specialized knowledge has been costly.

  Therefore, the present invention has been made in view of the above problems, and threshold adjustment that can reduce costs related to adjustment of a threshold related to radio wave reception intensity for determining whether or not to associate a terminal with a transmitter. An object is to provide an apparatus.

  In order to solve the above problem, a threshold adjustment device according to an aspect of the present invention provides a terminal that receives a radio wave transmitted from any one of a plurality of transmitters provided in a predetermined area. A threshold adjustment device that adjusts a threshold related to radio wave reception intensity for determining whether or not to associate with a transmitter, and is defined for each transmitter based on a transmitter position and threshold set in advance in a predetermined area. A display control means for presenting a determination area to be performed, a receiving means for receiving a change input for changing at least one of a position and a threshold value of at least one of the plurality of transmitters, and a change input, At least of the plurality of transmitters so that the determination areas of the plurality of transmitters do not overlap in the predetermined area, or all of the predetermined areas are occupied by the determination area. Comprising an adjusting means for adjusting the threshold of one of the transmitter, and an output means for outputting the adjusted by adjusting means threshold, the.

  According to the above aspect, the determination area for each transmitter is presented, and the change input of at least one of the position of the transmitter that defines the determination area and the threshold value related to the reception intensity of the radio wave is accepted. Can be done. Then, the threshold value of each transmitter is adjusted so that the determination regions do not overlap based on the change input or the entire predetermined area is occupied by the determination region, so that the threshold value can be easily adjusted. The Therefore, the cost for adjusting the threshold can be reduced.

  In the threshold adjustment apparatus according to another aspect, the determination region is defined as a region within a circle having a radius corresponding to the threshold as a center around the position of the transmitter in the predetermined area, and is located in the region. The terminal may be an area associated with the transmitter.

  According to the said form, the virtual determination area | region for every transmitter is appropriately defined.

  In the threshold value adjustment apparatus according to another aspect, the display control unit may display the determination area on the display unit based on the threshold value adjusted by the adjustment unit.

  According to the said form, it becomes possible to show the determination area | region of each transmitter based on the adjusted threshold value with respect to a user.

  In the threshold adjustment device according to another aspect, the display control unit may cause the display unit to graphically display the determination area.

  According to the said form, it becomes possible to show the determination area | region of each transmitter based on a threshold value visually with respect to a user.

  In the threshold value adjusting apparatus according to another aspect, the display means is configured by a touch panel, and the accepting means receives a change input for moving the position of the transmitter or changing the threshold value with respect to the determination area displayed on the display means. It is good also as accepting via.

  According to the said form, it becomes possible to perform the change input of the threshold value regarding the position and reception strength of each transmitter easily.

  In the threshold adjustment apparatus according to yet another aspect, the adjustment means prevents the determination areas of a plurality of transmitters from overlapping in a predetermined area, and maximizes the area occupied by the determination area in the predetermined area. The threshold value may be adjusted.

  According to the said form, adjustment of the threshold value which makes the area | region where a terminal is not linked | related with a transmitter in the predetermined area the minimum can be easily performed irrespective of a human effort. Therefore, the cost for adjusting the threshold can be reduced.

  In the threshold adjustment device according to another aspect, the adjustment unit may adjust the threshold so that the area where the determination area overlaps is minimized while the predetermined area is occupied by the determination area. Good.

  According to the above aspect, it is possible to minimize the terminal being associated with a plurality of transmitters in a predetermined area while the terminal is associated with one of the transmitters.

  In the threshold value adjusting apparatus according to another aspect, the output unit may store the threshold value adjusted by the adjusting unit in a predetermined storage unit.

  According to the above aspect, since the adjusted threshold value is stored in the predetermined storage unit, the terminal can acquire the adjusted threshold value by accessing the storage unit. Therefore, the terminal can appropriately perform the determination of the association with the transmitter based on the received intensity of the received radio wave and the positioning based on the position of the transmitter.

  It is possible to reduce the cost associated with the adjustment of the threshold value regarding the radio wave reception intensity for determining whether or not to associate the terminal with the transmitter.

It is a figure which shows the apparatus structure of the system containing a threshold value adjustment apparatus. It is a block diagram which shows the functional structure of a threshold value adjustment apparatus and a terminal. It is a figure which shows the mode of a site survey typically. It is a figure which shows the example of the determination area | region set with respect to each transmitter based on the result of a site survey. It is a flowchart which shows the procedure of the setting of the initial value of the receiving strength threshold value by site survey. It is a flowchart which shows the content of the position positioning process of the terminal in a predetermined area. It is a hardware block diagram of a threshold value adjustment apparatus. It is a figure which shows the example of reception of the change input in which the position of one transmitter is changed among several transmitters. It is a figure which shows the example of reception of the change input in which the radius of the determination area | region of one transmitter is changed among several transmitters. It is a flowchart which shows the processing content of the threshold value adjustment method. It is a flowchart which shows the adjustment process of a receiving intensity threshold value.

  An embodiment of a threshold adjustment 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 system including a threshold adjustment device according to the present embodiment. The system 1 includes a threshold adjustment device 10, a server 30, and a terminal 50.

  The system 1 of the present embodiment relates to a system that acquires a user's position in a predetermined area such as indoors where GPS radio waves cannot be received. In this system, a radio wave transmitted from a short-range wireless communication device (for example, a Bluetooth (registered trademark) device) installed in a predetermined area is received by the user's terminal 50, and position measurement is performed using the received intensity. Do.

  Since the radio wave transmitted from the transmitter includes identification information of the transmitter, the terminal 50 identifies the transmitter that is the source of the received radio wave and associates the terminal 50 with the transmitter. Is possible. And the node provided with the transmitter can be acquired as the position where the terminal 50 is located. Since the radio wave is attenuated according to the distance from the transmission source, when the terminal 50 receives the radio wave from the transmitter, the threshold value regarding the reception intensity of the radio wave for determining whether or not the terminal 50 is associated with the transmitter ( (Hereinafter referred to as “reception intensity threshold”) is set for each transmitter, thereby defining a determination region that is a range in which a terminal that receives a radio wave from the transmitter is associated with the transmitter. That is, it is determined that a terminal in the determination area is located at a transmitter node related to the determination area.

  In such a positioning system, in order to prevent the determination areas formed by the plurality of transmitters provided in the predetermined area from overlapping, the user manually circulates within the predetermined area provided with the plurality of transmitters. The reception strength is measured (site survey), and an initial setting of the reception strength threshold for each transmitter is performed based on the measurement result.

  If an event such as moving the position of the transmitter occurs after the initial setting of the reception strength threshold, it is necessary to adjust the reception strength threshold so that the determination areas do not overlap. In such a case, the threshold adjustment apparatus 10 according to the present embodiment associates a terminal that has received a radio wave transmitted from any one of a plurality of transmitters provided in a predetermined area with the transmitter. This is a device for adjusting a reception intensity threshold for determining whether or not.

  As shown in FIG. 1, the threshold adjustment device 10, the server 30, and the terminal 50 can communicate with each other via a network N. The server 30 has a transmitter information storage unit 31. The transmitter information storage unit 31 is a storage unit that stores transmitter information such as a reception intensity threshold set for each of a plurality of transmitters provided in a predetermined area. In this embodiment, the transmitter information storage unit 31 is provided in the server 30 different from the threshold adjustment device 10, but may be provided in the threshold adjustment device 10.

  The terminal 50 is a position measurement terminal, and can access the transmitter information storage unit 31 via the network N and acquire transmitter information. As described above, the terminal 50 can be associated with the receiver by receiving a radio wave from the transmitter in a predetermined area, and can be located at a node provided with the receiver.

  The terminal 50 is configured by, for example, a high-function mobile phone (smart phone), but an apparatus that configures the terminal 50 is not limited. For example, a mobile terminal such as a mobile phone or a personal digital assistant (PDA), a stationary type or a portable type A personal computer may be used. In FIG. 1, one terminal 50 is shown, but the number of terminals 50 is not limited to this.

  FIG. 2 is a block diagram illustrating functional configurations of the threshold adjustment device 10 and the terminal 50. First, prior to the description of the threshold adjustment device 10, the function of the terminal 50 will be described. In addition, with reference to FIG. 3 to FIG. 7, the initial setting of the reception intensity threshold regarding the reception intensity of the radio wave for each transmitter and the positioning process in the terminal 50 will be described. As illustrated in FIG. 2, the terminal 50 includes a radio wave measurement unit 51, a radio wave intensity smoothing unit 52, and a position estimation unit 53. Terminal 50 includes a receiving unit (not shown) that receives radio waves emitted from a transmitter for short-range wireless communication (Bluetooth).

  The radio wave measuring unit 51 measures the reception intensity of the radio wave received by the receiving unit, and acquires the identifier of the transmitter included in the radio wave.

  The radio wave intensity smoothing unit 52 smoothes the reception intensity measured by the radio wave measurement unit 51. Specifically, the radio wave intensity smoothing unit 52 applies a filter (low-pass filter) to the measured reception intensity to obtain an average value of the reception intensity for a predetermined time.

  The position estimation unit 53 estimates the position of the terminal 50 based on the radio wave reception intensity and the transmitter identifier. Specifically, the position estimation unit 53 acquires the reception intensity threshold set for the transmitter from the transmitter information storage unit 31 based on the identifier of the transmitter. When the reception intensity exceeds the reception intensity threshold, the position estimation unit 53 determines to associate the terminal 50 with the transmitter. Then, the position estimation unit 53 estimates the position of the node provided with the associated transmitter as the position of the terminal 50.

  FIG. 3 is a diagram schematically showing the state of the site survey. In order to set the initial value of the reception intensity threshold for each transmitter, a site survey is performed in which the reception intensity of each place is measured manually by going around the predetermined area A in which a plurality of transmitters are provided. In the example shown in FIG. 3, transmitters BA, BB, and BC are provided in the predetermined area A. In the site survey, while the person H circulates in the predetermined area A, the reception intensity of the radio wave at a position away from each of the transmitters BA, BB, BC is measured.

  The reference reception intensity (TxPower) measured at a predetermined distance, for example, 1 m from the transmitter is a known value, and is, for example, a packet (for example, an advertisement packet) transmitted from the transmitter. included. In the site survey, the reception intensity at a position away from the transmitter by a distance (for example, 2 m) different from the condition under which TxPower is measured is measured.

When the reception intensity (TxPower) measured at a distance of 1 m from the transmitter is A (dbm) and the radio wave attenuation rate is n, the radio wave reception intensity RSSI (d) at a position away from the transmitter by d (m) Is known to be represented by the following formula (1).

  For example, the reception intensity RSSI (2) at a position 2 m away from the transmitter is measured by the site survey, and the value A (dbm) of TxPower is known. As a result of the site survey, the attenuation rate of the radio wave for each transmitter n can be calculated.

  By determining the attenuation factor n, the reception intensity can be defined for each transmitter as a function of the distance from the transmitter. Therefore, when the reception intensity threshold value related to the reception intensity of the radio wave for determining whether or not to associate the terminal 50 with the transmitter is set to a certain value, the length corresponding to the reception intensity threshold value is set around the position of the transmitter. A region within a circle having a radius can be defined as a determination region in which a terminal located in the region is associated with the transmitter.

  FIG. 4 is a diagram illustrating an example of determination areas set for the transmitters BA, BB, and BC based on the results of the site survey. A reception strength threshold (th = −56) is set for the transmitter BA, and a determination area CA0 based on the reception strength threshold is defined. A reception strength threshold (th = −52) is set for the transmitter BB, and a determination region CB0 based on the reception strength threshold is defined. A reception strength threshold (th = −53) is set for the transmitter BC, and a determination region CC0 based on the reception strength threshold is defined. As shown in the figure, initial setting of reception intensity thresholds of the plurality of transmitters BA, BB, BC is performed so that the determination areas CA0, CB0, CC0 do not overlap in the predetermined area A. Information indicating the position of the transmitter and the reception intensity threshold value are stored in the transmitter information storage unit 31 as transmitter information for each transmitter.

  FIG. 4 is also a diagram illustrating an example of a screen when the determination area is presented to the user in the threshold adjustment device 10. In the example of the screen of FIG. 4, the shape and size of the predetermined area A, the positions of the transmitters BA, BB, and BC, and the positions and sizes of the determination areas CA0, CB0, and CC0 are reflected at a predetermined scale. Has been. That is, the pixel of the display means (for example, display) of the threshold adjustment device 10 and the physical position in the predetermined area A are uniquely associated.

  FIG. 5 is a flowchart showing a procedure for setting an initial value of the reception intensity threshold by the site survey. As described above, this flow is performed manually.

  In step S1, it is determined whether or not the measurement of the radio wave reception intensity at a predetermined position and the setting of the reception intensity threshold for all the transmitters have been completed (S1). If measurement and setting for all transmitters have not been completed, the processing procedure proceeds to step S2. On the other hand, when the measurement and setting for all transmitters is completed, the processing procedure ends.

  In step S2, the radio wave reception intensity of one transmitter is measured at a position away from the transmitter by a certain distance (for example, 2 m) (S2). Subsequently, as described above, a reception intensity threshold for the transmitter is set (S3).

  Then, the set reception intensity threshold value is stored as transmitter information in the database of the transmitter information storage unit 31 (S4). The processing procedure of steps S1 to S4 is repeated for all transmitters.

  FIG. 6 is a flowchart showing the contents of the positioning process of the terminal 50 in the predetermined area A. First, the radio wave measurement unit 51 of the terminal 50 measures the reception intensity of the radio wave received by the reception unit for a predetermined time (for example, n seconds) (S11). Subsequently, the radio wave intensity smoothing unit 52 calculates the average of the radio wave reception intensity measured in step S11 for n seconds (low-pass filter process) (S12).

  Next, the position estimation unit 53 sets the reception intensity threshold value associated with the transmitter identifier acquired from the radio wave having the strongest reception intensity among the radio waves measured in steps S11 to S12 in the transmitter information storage unit 31. Obtained from the database (S13). The transmitter identifier is included in the radio wave from the transmitter and is acquired by the radio wave measuring unit 51.

  Subsequently, the position estimation unit 53 determines whether the reception intensity of the radio wave exceeds the acquired reception intensity threshold (S14). If it is determined that the reception intensity exceeds the reception intensity threshold, the process proceeds to step S15. On the other hand, if it is not determined that the reception intensity exceeds the reception intensity threshold, the process proceeds to step S16.

  In step S15, the position estimation unit 53 associates the terminal 50 with the transmitter corresponding to the acquired identifier. Then, the position estimation unit 53 estimates and outputs the node ID of the node where the associated transmitter is installed as information on the location of the terminal 50 (S15).

  On the other hand, in step S16, the position estimation unit 53 outputs the node ID previously associated as the location of the terminal 50 as the current location (S16).

  With reference to FIG. 2 again, each functional unit of the threshold adjustment device 10 will be described. The threshold adjustment apparatus 10 includes a display control unit 11 (display control unit), a reception unit 12 (reception unit), an adjustment unit 13 (adjustment unit), and an output unit 14 (output unit).

  FIG. 7 is a hardware configuration diagram of the threshold adjustment device 10. As shown in FIG. 7, the threshold adjustment device 10 physically includes a CPU 101, a RAM 102 and a ROM 103, which are main storage devices, a communication module 104, which is a data transmission / reception device, an auxiliary storage device 105 such as a hard disk and a flash memory, and an input. The computer system includes an input device 106 such as a keyboard, which is a device, and an output device 107 such as a display. Each function shown in FIG. 2 has a communication module 104, an input device 106, and an output device 107 under the control of the CPU 101 by loading predetermined computer software on the hardware such as the CPU 101 and the RAM 102 shown in FIG. This is realized by reading and writing data in the RAM 102 and the auxiliary storage device 105. The terminal 50 shown in FIG. 2 is similarly configured as a computer system. Again, with reference to FIG. 2, each function part of the threshold adjustment apparatus 10 is demonstrated.

  The display control unit 11 is a part that presents a determination area defined for each transmitter based on a transmitter position and a reception intensity threshold set in advance in the predetermined area A. As described above, the position of the transmitter in the predetermined area A and the reception intensity threshold value are stored in the transmitter information storage unit 31 as transmitter information for each transmitter.

  The display control unit 11 acquires the transmitter information from the transmitter information storage unit 31 and causes the display unit to display an image indicating the determination area of each transmitter. As described above, FIG. 4 shows an example of a screen showing the determination area presented by the display control unit 11.

  As shown in FIG. 4, the display controller 11 graphically displays the determination areas CA0, CB0, CC0 of the transmitters BA, BB, BC provided in the predetermined area on the display means. The determination area CA0 is an area within a circle centered on the position of the transmitter BA and having a radius corresponding to the reception intensity threshold (th = −56). The determination area CB0 is an area in a circle having a radius corresponding to the reception intensity threshold (th = −52) with the position of the transmitter BB as the center. The determination area CC0 is an area within a circle having a radius corresponding to the reception intensity threshold (th = −53) with the position of the transmitter BC as the center. By displaying the determination area graphically in this manner, the determination area of each transmitter based on the reception intensity threshold can be visually shown to the user.

  The accepting unit 12 accepts a change input for changing at least one of the position of at least one of the plurality of transmitters and the reception intensity threshold. Specifically, since the display means included in the threshold adjustment device 10 of the present embodiment can be configured by a touch panel, for example, the receiving unit 12 can receive a change input via the touch panel. By configuring so that a change input can be received via the touch panel, it is possible to easily perform a change input of a threshold value regarding the position and reception intensity of each transmitter.

  Based on the change input, the adjustment unit 13 includes a plurality of transmitters so that the determination areas of the plurality of transmitters do not overlap in the predetermined area A, or all of the predetermined areas A are occupied by the determination areas. The reception strength threshold of at least one of the transmitters is adjusted.

  The display control unit 11 causes the display unit to display the determination area based on the reception intensity threshold adjusted by the adjustment unit 13. Thereby, it becomes possible to show the determination area of each transmitter based on the adjusted threshold to the user. Then, the output unit 14 outputs the reception intensity threshold adjusted by the adjustment unit 13 to the transmitter information storage unit 31. Thus, the adjusted reception intensity threshold value is stored in the transmitter information storage unit 31, so that the terminal 50 can obtain the adjusted reception intensity threshold value by accessing the transmitter information storage unit 31. Therefore, the terminal 50 can appropriately perform the determination of the association with the transmitter based on the received intensity of the received radio wave and the positioning based on the position of the transmitter.

  With reference to FIG. 8, the example of reception of the change input in which the position of one transmitter is changed among several transmitters is demonstrated concretely. Here, an example will be described in which the threshold value of the transmitter is adjusted in accordance with the change input so that the determination regions do not overlap. When an input for moving the position of the transmitter BB as shown by an arrow r1 in FIG. 8 is performed by the user on the touch panel on which the determination area of each transmitter is displayed as shown in FIG. 12 receives a change input of the position of the transmitter BB.

  The adjustment unit 13 adjusts the reception intensity threshold set for each transmitter so that the determination areas of the transmitters BA, BB, and BC do not overlap according to the change in the position of the transmitter BB. Specifically, since the determination area CB0 and the determination area CC0 overlap due to the change in the position of the transmitter BB, the adjustment unit 13 reduces the determination area CB0, for example, as indicated by an arrow r12. The reception intensity threshold value of the transmitter BB is adjusted to (th = -50), and the determination region CB1 is set as the determination region of the transmitter BB.

ここで、判定領域の半径を一意に設定するために、例えば、判定領域の半径を隣接する発信器との最短距離の１／２にする、というようなルールを適宜適用して、判定領域の半径及び受信強度閾値が調整されてもよい。 When the adjustment unit 13 adjusts the reception intensity threshold so that the determination areas of one transmitter (first transmitter) and another transmitter (second transmitter) do not overlap, the first and second transmissions are performed. If the coordinates indicating the position of the device are (x ₁ , y ₁ ) and (x ₂ , y ₂ ), respectively, and the lengths of the radii corresponding to the received intensity thresholds are r ₁ and r ₂ , respectively, The length of the radius of each determination area is adjusted so that 2) does not become true, and a reception intensity threshold corresponding to the adjusted radius is calculated.

Here, in order to uniquely set the radius of the determination region, for example, by appropriately applying a rule such as setting the radius of the determination region to ½ of the shortest distance from the adjacent transmitter, The radius and reception strength threshold may be adjusted.

  In addition, the adjustment unit 13 adjusts the reception intensity threshold so that the area occupied by the determination areas of the plurality of transmitters is maximized in the predetermined area A. In the example shown in FIG. 8, in response to the determination area of the transmitter BB being reduced, the adjustment unit 13 receives the transmitter BA so as to expand the determination area CA0, for example, as indicated by an arrow r11. The intensity threshold is adjusted to (th = −62), and the determination area CA1 is set as the determination area of the transmitter BA.

  As described above, the reception intensity threshold adjustment processing by the adjustment unit 13 can apply a method using a well-known genetic algorithm and a method for solving an optimization problem, and the method used is limited. Not. In this way, by configuring the reception intensity threshold so that the area occupied by the determination areas of the plurality of transmitters is maximized, the area in the predetermined area where the terminal is not associated with the transmitter Adjustment of the threshold value to be minimized can be easily performed regardless of human labor. Therefore, the cost for adjusting the threshold can be reduced.

  The display control unit 11 displays the determination area of each transmitter on the display unit based on the reception intensity threshold adjusted as described above. Specifically, the display control unit 11 displays the determination areas CA1, CB1, and CC0 indicated by solid lines in FIG.

  The output unit 14 uses, as transmitter information of the transmitters BA, BB, and BC, the transmitter intensity information corresponding to the radius of each of the determination areas CA1, CB1, and CC0 adjusted by the adjuster 13 as a transmitter information storage unit. 31 is stored.

  Next, referring to FIG. 9, an example of accepting a change input in which the radius of the determination area of one transmitter among the plurality of transmitters is changed will be specifically described. As shown in FIG. 4, the user inputs an input to shorten the radius of the determination area CB0 of the transmitter BB as shown by an arrow r2 in FIG. By performing a drag-and-drop operation on a part of the circumference). When such an input is made by the user, the accepting unit 12 accepts the input of the determination area of the transmitter BB as a shortened radius and a corresponding change in the received intensity threshold value.

  The adjustment unit 13 is occupied by the determination areas of the plurality of transmitters in the predetermined area A so that the determination areas of the transmitters BA, BB, and BC do not overlap with each other according to the change of the position of the transmitter BB. The reception intensity threshold is adjusted so that the area is maximized.

  Specifically, the adjustment unit 13 first sets the determination area CB2 in accordance with a change in the radius of the determination area of the transmitter BB. Subsequently, the adjustment unit 13 increases the radii of the determination areas CA0 and CC0 of the transmitters BA and BC as indicated by arrows r21 and r22 so that the area occupied by the determination area in the predetermined area A is maximized. Determination areas CA2 and CC2 are set. Then, the adjustment unit 13 sets the reception strength threshold value (th = −60) of the transmitter BA corresponding to the determination region CA2, and sets the reception strength threshold value (th = −57) of the transmitter BC corresponding to the determination region CC2. Set.

  The display control unit 11 displays the determination area of each transmitter on the display unit based on the reception intensity threshold adjusted as described above. Specifically, the display control unit 11 causes the display unit to display determination areas CA2, CB2, and CC2 indicated by solid lines in FIG.

  The output unit 14 uses a reception intensity threshold corresponding to each radius of the determination areas CA2, CB2, and CC2 adjusted by the adjustment unit 13 as transmitter information of the transmitters BA, BB, and BC as a transmitter information storage unit. 31 is stored. In other words, the displayed determination area can be reduced or enlarged by dragging and dropping the circumference of the determination area visualized graphically on the screen. Thereby, not only the displayed determination area is changed, but also the reception intensity threshold corresponding to the determination area is automatically calculated by the adjustment unit 13 and stored in the database as the adjusted reception intensity threshold.

  8 and 9, the example in which the reception intensity threshold is adjusted on the condition that the determination areas of a plurality of transmitters do not overlap has been described. However, the adjustment unit 13 allows the determination areas to overlap. Thus, the reception intensity threshold value may be adjusted so that the entire predetermined area A is occupied by the determination area. By adjusting the reception intensity threshold in this way, it is possible to prevent the terminal 50 from being associated with any transmitter in the predetermined area A. In addition, the adjustment unit 13 may adjust the threshold so that the area where the determination areas overlap is minimized while the predetermined area A is occupied by the determination area. By adjusting the reception intensity threshold in this way, in the predetermined area A, the terminal can be associated with one of the transmitters, while minimizing the terminal being associated with a plurality of transmitters. Can be fastened.

  Next, processing contents of the threshold adjustment method in the threshold adjustment apparatus 10 will be described with reference to FIGS. FIG. 10 is a flowchart showing the processing contents of the threshold adjustment method.

  First, the display control unit 11 presents a determination area defined for each transmitter based on the transmitter position and reception intensity threshold set in advance in the predetermined area A (S21). Next, the reception unit 12 receives a change input for changing at least one of the position of at least one transmitter and the reception intensity threshold value among the plurality of transmitters (S22).

  Subsequently, the adjustment unit 13 sets the reception intensity threshold value of at least one transmitter among the plurality of transmitters based on the change input so that the determination areas of the plurality of transmitters do not overlap in the predetermined area A. Adjust (S23).

  The reception intensity threshold adjustment process in step S23 will be described in detail with reference to FIG. First, the adjustment unit 13 determines the content of the change input (S31). When the content of the change input is a change in the position of the transmitter, the adjustment unit 13 acquires coordinates corresponding to the changed position (S32). On the other hand, when the content of the change input is the reception intensity threshold, that is, the radius of the determination area, the adjustment unit 13 acquires the length of the radius corresponding to the changed reception intensity threshold (S33). ).

  Further, the adjustment unit 13 acquires IDi for identifying the transmitter whose position or reception intensity threshold has been changed (S34). Then, the adjustment unit 13 searches for a transmitter whose determination area overlaps with the transmitter i as a transmitter whose reception intensity threshold is to be adjusted (S35).

  Subsequently, the adjustment unit 13 adjusts the radius of the determined determination area of each transmitter so that the determination areas do not overlap (S36). Then, the adjustment unit 13 calculates a reception intensity threshold corresponding to the radius adjusted in step S36 based on the reference radio wave intensity (TxPower) and the radio wave attenuation rate of each transmitter (S37).

  Referring to FIG. 10 again, the output unit 14 outputs the reception intensity threshold value of each transmitter calculated in step S37 (S24). For example, the output unit 14 causes the transmitter information storage unit 31 to store the calculated reception intensity threshold in association with each transmitter. Moreover, the display control part 11 may display the determination area | region of each transmitter on a display means graphically based on the adjusted receiving intensity threshold value.

  10 and 11, the example in which the reception intensity threshold is adjusted so that the determination areas do not overlap has been described. However, as described above, all the determination areas A are determined while allowing the determination areas to overlap. The reception intensity threshold may be adjusted with priority given to occupying the area.

  According to the threshold adjustment device 10 and the threshold adjustment method of the present embodiment, a determination region for each transmitter is presented, and a change input of at least one of the threshold regarding the position of the transmitter and the reception intensity of the radio wave that defines the determination region is provided. Can be accepted, so it is possible to visually input a change. Then, the threshold value of each transmitter is adjusted so that the determination regions do not overlap based on the change input or the entire predetermined area is occupied by the determination region, so that the threshold value can be easily adjusted. The Therefore, the cost for adjusting the threshold can be reduced.

  The present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above embodiment. The present invention can be variously modified without departing from the gist thereof.

  DESCRIPTION OF SYMBOLS 10 ... Threshold adjustment apparatus, 11 ... Display control part, 12 ... Reception part, 13 ... Adjustment part, 14 ... Output part, 30 ... Server, 31 ... Transmitter information storage part, 50 ... Terminal, 51 ... Radio wave measurement part, 52 ... Radio wave intensity smoothing unit, 53 ... position estimation unit.

Claims (8)

Adjusts the threshold value related to radio wave reception strength to determine whether or not to associate a terminal that has received radio waves transmitted from one of a plurality of transmitters provided in a predetermined area with the transmitter. A threshold adjustment device for
Display control means for presenting a determination area defined for each transmitter based on the position of the transmitter set in advance in the predetermined area and the threshold;
Accepting means for accepting a change input for changing at least one of the position and the threshold value of at least one of a plurality of transmitters;
Based on the change input, the determination areas of a plurality of transmitters in the predetermined area do not overlap or all of the predetermined areas are occupied by the determination area. Adjusting means for adjusting the threshold of at least one of the transmitters;
Output means for outputting a threshold adjusted by the adjusting means;
A threshold adjustment device comprising: The determination area is defined as an area within a circle whose center is the position of the transmitter in the predetermined area and whose radius is a length corresponding to a threshold value, and a terminal located in the area is associated with the transmitter. Area,
The threshold adjustment apparatus according to claim 1. The display control unit causes the display unit to display the determination area based on the threshold value adjusted by the adjustment unit.
The threshold value adjustment apparatus according to claim 1 or 2. The display control means causes the display means to graphically display the determination area.
The threshold value adjustment apparatus according to claim 3. The display means includes a touch panel,
The accepting means accepts a change input for moving the position of the transmitter or changing the threshold value with respect to the determination area displayed on the display means via the touch panel.
The threshold adjustment apparatus according to claim 4. The adjusting means adjusts the threshold value so that the area occupied by the determination area in the predetermined area is maximized while the determination areas of the plurality of transmitters do not overlap in the predetermined area.
The threshold value adjustment apparatus as described in any one of Claims 1-5. The adjusting means adjusts the threshold so that an area where the determination areas overlap is minimized while making the entire determination area occupy the predetermined area.
The threshold value adjustment apparatus as described in any one of Claims 1-5. The output means stores the threshold adjusted by the adjusting means in a predetermined storage means.
The threshold value adjustment apparatus according to any one of claims 1 to 7.

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