JP5304633B2 - Measuring apparatus, measuring method, measuring system and measuring program - Google Patents

Description

  The present invention relates to a measuring apparatus, a measuring method, a measuring system, and a measuring program for measuring communication quality.

  2. Description of the Related Art Conventionally, a wireless communication system including an access point (AP: Access Point) serving as a parent device and an end terminal (ED: End Device) serving as a child device is used (see, for example, Patent Document 1 below). . In such a wireless communication system, the transmission / reception sensitivity of the end device deteriorates according to the distance from the access point.

  When installing an access point in a network built in a building, the indoor radio wave conditions, such as whether the end terminal can communicate wirelessly with the access point at each location in the room, or how strong it can be. An operation of monitoring and checking (communication quality) is performed. If the monitoring results indicate that there are many areas that cannot be communicated, for example, change the direction of the antenna, move the access point installation position, and adjust the access point's radio wave output if possible, for example. Improve the condition.

JP 2009-260925 A

  However, the above-described conventional technique has a problem that it is difficult to measure the communication quality distribution in the measurement target area. For example, the user has a paper map in one hand, actually goes indoors, visually confirms the position of the end terminal, and manually plots on the paper map using a writing instrument. Will increase. In addition, in order to capture the position plotted on the paper map as electronic data, a scale such as 1 [cm] on the paper corresponding to the actual 5 [m] is examined in advance, the reference position on the paper and the terminal plot The relative distance from the position is calculated. If this is done manually, the amount of work is further increased.

  The disclosed measurement apparatus, measurement method, measurement system, and measurement program are intended to solve the above-described problems and to facilitate measurement of communication quality distribution.

  In order to solve the above-described problems and achieve the object, the disclosed technology acquires identification information of end terminals arranged in a target area, images the target area, and determines a plurality of end terminals based on the imaging result. Each position coordinate is specified, and correspondence information in which the acquired identification information is associated with each specified position coordinate is generated and is not included in the existing correspondence information among the position coordinates. Associating position coordinates with the identification information, measuring communication quality between the end terminal and the access point, and generating information associating position coordinates with communication quality based on the generated correspondence information It is necessary to output the generated information.

  According to the disclosed measuring apparatus, measuring method, measuring system, and measuring program, it is possible to easily measure the communication quality distribution.

It is a figure which shows an example of the communication system of a measuring object. It is a figure which shows an example of the reception power for every end terminal. It is a graph which shows an example of the electromagnetic wave propagation characteristic between an access point and an end terminal. It is a figure which shows an example of the signal received by an end terminal. It is a figure which shows an example of the measurement system concerning embodiment. It is a block diagram which shows the structure (the 1) of the measuring apparatus concerning embodiment. It is a block diagram which shows the structure (the 2) of the measuring apparatus concerning embodiment. It is a flowchart which shows an example of the production | generation operation | movement of the corresponding information by a measuring device. It is a sequence diagram which shows an example of the production | generation operation | movement of the corresponding information by a measurement system. It is FIG. (1) which shows specification of the position coordinate of an end terminal. It is FIG. (2) which shows specification of the position coordinate of an end terminal. It is a figure which shows an example of the template of an end terminal. It is a figure which shows an example of the image data of a target area. It is a figure which shows an example of matching (the 1). It is a figure (the 2) which shows an example of matching. It is FIG. (3) which shows an example of matching. It is a figure which shows an example of the corresponding information produced | generated by the matching part. It is a flowchart which shows an example of the measurement operation | movement of communication quality by a measuring device. It is a sequence diagram which shows an example of the measurement operation | movement of communication quality by a measurement system. It is a figure which shows transmission of LQI by each end terminal. It is a figure which shows an example of the information which matched the position coordinate and LQI. It is a figure which shows an example of the output by an output part. It is FIG. (1) which shows the other example of the output by an output part. It is FIG. (2) which shows the other example of the output by an output part. It is FIG. (3) which shows the other example of the output by an output part.

  Exemplary embodiments of a disclosed measuring apparatus, measuring method, measuring system, and measuring program will be described below in detail with reference to the accompanying drawings. The disclosed measurement apparatus, measurement method, measurement system, and measurement program specify the position coordinates of the end terminal based on the image data of the target area and measure the communication quality of the end terminal. Then, the communication quality corresponding to the position coordinates of the target area is measured to facilitate the measurement of the communication quality distribution in the target area.

(Embodiment)
(Measurement target communication system)
First, a communication system to be measured in the measurement system according to the embodiment (see, for example, FIG. 5) will be described.

  FIG. 1 is a diagram illustrating an example of a communication system to be measured. As illustrated in FIG. 1, a communication system 100 to be measured includes access points 111 to 113, a computer 120, and end terminals 131 to 137 (ED). The access points 111 to 113 are connected to the computer 120 via a LAN (Local Area Network) and are controlled by the computer 120.

  The end terminals 131 to 134 are located in the vicinity of the access point 111 and perform wireless communication with the access point 111. The end terminal 135 is located near the access point 112 and performs wireless communication with the access point 112. End terminals 136 and 137 are located in the vicinity of access point 113, and perform wireless communication with access point 113.

  FIG. 2 is a diagram illustrating an example of received power for each end terminal. 2 shows the access point 111 and the end terminals 131 to 133 shown in FIG. The received powers 201 to 203 indicate the received power (reception sensitivity) from the access point 111 in the end terminals 131 to 133, respectively, and the longer the shaded portion, the higher the received power. As shown in received power 201 to 203, the end terminals 131 to 133 have different received power due to the distance from the access point 111 and the influence of reflection.

  FIG. 3 is a graph showing an example of radio wave propagation characteristics between the access point and the end terminal. In FIG. 3, the horizontal axis indicates the distance [m] between the access point 111 and the end terminals 131 to 133. The vertical axis represents a communication loss [dB] between the access point 111 and the end terminals 131 to 133.

  A characteristic 311 indicates a loss characteristic (radio wave propagation characteristic) with respect to the distance between the access point 111 and the end terminals 131 to 133 when it is assumed that there is no reflection in the communication system 100 to be measured. As shown by the characteristic 311, when there is no ideal reflection in the measurement target communication system 100, the communication loss increases as the distance between the access point 111 and the end terminals 131 to 133 increases.

  A characteristic 312 indicates a loss characteristic (radio wave propagation characteristic) with respect to the distance between the access point 111 and the end terminals 131 to 133 when there is reflection in the communication system 100 to be measured. As shown by the characteristic 312, when there is reflection in the communication system 100 to be measured, there are peaks and valleys in the radio wave propagation characteristic, and communication loss is caused by the distance between the access point 111 and the end terminals 131 to 133. It changes complicatedly.

  FIG. 4 is a diagram illustrating an example of a signal received by the end terminal. An antenna 411 illustrated in FIG. 4 is an antenna of the access point 111, for example. The antenna 412 is an antenna of the end terminals 131 to 133, for example. When a signal is transmitted from the antenna 411 to the antenna 412, the signal received by the antenna 412 is a combined wave of the direct wave 421 and the reflected wave 422. The direct wave 421 is a component that directly reaches the antenna 412 in the signal transmitted from the antenna 411. The reflected wave 422 is a component of the signal transmitted from the antenna 411 that is reflected by the floor 430 and reaches the antenna 412.

  Thus, even when there is only one reflection of the floor 430, the signals received by the end terminals 131 to 133 are combined waves. For this reason, as indicated by the characteristic 312 in FIG. 3, the communication loss varies in a complicated manner depending on the distance between the access point 111 and the end terminals 131 to 133. In a more general indoor space, there are side walls and a ceiling (total of 6 surfaces), so that the radio wave propagation characteristics change more complicatedly. The measurement system according to the embodiment is a system that measures the communication quality distribution of such a communication system 100, for example.

(Configuration of measurement system)
FIG. 5 is a diagram illustrating an example of the measurement system according to the embodiment. As shown in FIG. 5, the measurement system 500 according to the embodiment includes a measurement device 510, an access point 520, a camera 530, and an end terminal 541. The measurement system 500 is a system that measures the communication quality distribution in the target area 501.

  Measuring device 510, access point 520, and camera 530 are connected to each other by a LAN. The access point 520 performs wireless communication with each end terminal (for example, the end terminal 541) in the target area 501. The access point 520 is connected to, for example, a core network, and relays communication between the core network and each end terminal in the target area 501.

  The camera 530 is provided at a position where each end terminal arranged in the target area 501 can be imaged. For example, the camera 530 is built in the access point 520 and provided on the ceiling of the target area 501. The camera 530 may be a camera provided separately from the access point 520. The camera 530 images the target area 501 under the control of the measurement device 510. The camera 530 transmits image data obtained by imaging to the measurement device 510.

  For the camera 530, a wide-angle lens such as F = 35 [mm] or 28 [mm], a fish-eye lens, or the like may be used to capture an image of the target area 501. Further, the target area 501 may be imaged by a plurality of cameras including the camera 530. In addition, the camera 530 may capture a video (moving image) of the target area 501 or may capture a still image of the target area 501.

  When the end terminal 541 enters the communication area of the access point 520 or is turned on in the communication area of the access point 520, the end terminal 541 performs a participation process for the access point 520. The access point 520 permits the end terminal 541 to join the network.

  For example, in the service of the MAC (Media Access Control) layer disclosed in the communication standard IEEE 802.15.4, an MLME-ASSOCIATE function is prepared for network connection. Thereby, it is possible to confirm which terminal ID of the terminal ID has participated in the access point 520.

  FIG. 6A is a block diagram of the configuration (part 1) of the measuring apparatus according to the embodiment. In FIG. 6A, the same components as those shown in FIG. As illustrated in FIG. 6, the measurement apparatus 510 includes an imaging unit 611, a specifying unit 612, a measurement unit 613, a generation unit 614, and an output unit 615.

<About the imaging unit>
The imaging unit 611 controls the camera 530 and images the target area 501. For example, when the imaging unit 611 transmits an imaging command signal to the camera 530, the target area 501 is imaged by the camera 530, and image data obtained by imaging is transmitted to the imaging unit 611. The imaging unit 611 receives image data (imaging result) obtained by imaging from the camera 530, and outputs the received image data to the specifying unit 612.

<About specific part>
The specifying unit 612 specifies the position coordinates of the end terminal 541 arranged in the target area 501 based on the image data output from the imaging unit 611. Specifically, the specifying unit 612 stores an image of the end terminal 541 as a template in advance. Then, the specifying unit 612 specifies the position coordinates (for example, the coordinates of the center of gravity position) of the end terminal 541 by performing pattern matching that searches for a portion similar to the template from the image data from the imaging unit 611. The specifying unit 612 notifies the measuring unit 613 of the specified position coordinates.

<About the measurement unit>
The measurement unit 613 measures the communication quality between the end terminal 541 and the access point 520. For example, the end terminal 541 measures the received power from the end terminal 541 at the access point 520 as the communication quality. Specifically, the access point 520 measures the reception power of the signal transmitted from the end terminal 541 and transmits information indicating the measured reception power to the measurement unit 613. The measurement unit 613 receives information indicating the reception power transmitted from the access point 520.

  Alternatively, the measurement unit 613 measures reception power from the access point 520 in the end terminal 541 as communication quality. Specifically, the end terminal 541 periodically measures the received power based on the signal from the access point 520, and when receiving the radio wave acquisition command, transmits information on the measured received power to the access point 520.

  The information indicating the received power is, for example, LQI (Link Quality Indicator). LQI is a value of 1 byte from 0 to 255, for example, and the larger the value, the better the radio wave condition. The measurement unit 613 transmits a radio wave acquisition command to the end terminal 541 via the access point 520 and receives information on the received power transmitted from the end terminal 541 to the access point 520 from the access point 520.

  In the following description, a case where measuring section 613 measures received power from access point 520 in end terminal 541 as communication quality will be described. The measurement unit 613 notifies the generation unit 614 of the measured communication quality.

<Generator and output unit>
The generation unit 614 generates information in which the position coordinates notified from the specifying unit 612 and the communication quality notified from the measurement unit 613 are associated with each other, and outputs the generated information to the output unit 615. For example, the generation unit 614 generates image data in which the communication quality notified from the measurement unit 613 is plotted at the position of the position coordinate notified from the specifying unit 612 in the image data indicating the target area 501. Thereby, the user can intuitively grasp the communication quality distribution of the target area 501. The output unit 615 outputs the information output from the generation unit 614.

  With the configuration of the measuring apparatus 510 described above, the position coordinates of the end terminal 541 are specified based on the image data of the target area 501, the communication quality of the end terminal 541 is measured, and the position coordinates and the communication quality are output in association with each other. be able to. Thereby, the communication quality corresponding to the position coordinates of the target area 501 can be measured, and the measurement of the communication quality distribution of the target area 501 can be facilitated. The measuring apparatus 510 can be realized by a program that causes a computer to operate as the imaging unit 611, the specifying unit 612, the measuring unit 613, the generating unit 614, and the output unit 615, for example.

  FIG. 6B is a block diagram of the configuration (part 2) of the measuring apparatus according to the embodiment. 6B, the same components as those illustrated in FIG. 6A are denoted by the same reference numerals, and description thereof is omitted. A measurement apparatus 510 illustrated in FIG. 6B includes an acquisition unit 621 and an association unit 622 in addition to the configuration illustrated in FIG.

  When a plurality of end terminals are included in the image data of the target area 501, the specifying unit 612 specifies the position coordinates of the plurality of end terminals included in the image data. Further, the specifying unit 612 notifies the associating unit 622 of the specified position coordinates.

<About the acquisition unit>
The acquisition unit 621 acquires the terminal ID (identification information) of the end terminal 541. For example, the acquisition unit 621 acquires the terminal ID assigned to the end terminal 541 from the access point 520. Further, the acquisition unit 621 may acquire the terminal ID from the access point 520 when the end terminal 541 performs the process of joining the access point 520 to the network. The acquisition unit 621 notifies the association unit 622 of the acquired terminal ID.

<About the association unit>
The association unit 622 generates association information in which the terminal ID of the end terminal 541 notified from the acquisition unit 621 and the position coordinates notified from the specifying unit 612 are associated with each other. The correspondence information generated by the associating unit 622 is stored in the memory of the measuring apparatus 510, for example.

  In addition, when there are a plurality of end terminals in the target area 501, the associating unit 622 uses the existing correspondence information among the position coordinates notified from the specifying unit 612 to the terminal ID notified from the acquiring unit 621. You may make it match | combine the position coordinate which is not contained in. Thereby, the position coordinates of the end terminal newly arranged in the target area 501 can be distinguished from the position coordinates of other end terminals arranged in the target area 501 and associated with the terminal ID.

  The generation unit 614 associates the position coordinates with the communication quality based on the correspondence information generated by the association unit 622 and stored in the memory of the measurement apparatus 510. Specifically, the generation unit 614 acquires the position coordinates corresponding to the terminal ID of the end terminal 541 notified of the communication quality from the measurement unit 613 from the correspondence information, and notified from the acquired position coordinates and the measurement unit 613. Correlate with communication quality.

  As described above, by storing the correspondence information in which the terminal ID and the position coordinates are associated with each other, the generation unit 614 determines whether the communication quality measured from the measurement unit 613 is any of the position coordinates specified by the specifying unit 612. Can be determined. Thereby, each communication quality in each position coordinate of the target area 501 can be measured by arranging a plurality of end terminals in the target area 501. For this reason, the measurement of the communication quality distribution in the target area 501 can be further facilitated.

(Generation of correspondence information between terminal ID and position coordinates of end terminal)
FIG. 7 is a flowchart illustrating an example of the operation for generating the correspondence information by the measurement apparatus. As shown in FIG. 7, first, the acquisition unit 621 determines whether or not a terminal ID has been received from the access point 520 (step S701), and waits until a terminal ID is received (step S701: No loop). When the terminal ID is received (step S701: Yes), the imaging unit 611 transmits an imaging command signal to the camera 530 (step S702).

  Next, the imaging unit 611 determines whether image data has been received from the camera 530 (step S703), and waits until image data is received (step S703: No loop). When the image data is received (step S703: Yes), the specifying unit 612 specifies each position coordinate of the end terminal included in the received image data (step S704).

  Next, the specifying unit 612 specifies position coordinates that are not included in the existing correspondence information stored in the memory of the measuring device 510 among the position coordinates acquired in step S704 (step S705). Next, the associating unit 622 stores correspondence information between the terminal ID received in step S701 and the position coordinates specified in step S705 in the memory of the measuring apparatus 510 (step S706), and performs a series of operations. finish.

  For example, the user arranges end terminals one by one in the target area 501. Then, each time a new end terminal is placed in the target area 501, the user operates the measuring apparatus 510 to execute the above steps. Thereby, the measuring apparatus 510 can memorize | store the correspondence information which matched each terminal ID and each coordinate position of each end terminal (for example, end terminal 541) in the object area 501 with each other.

  Thus, the acquisition of the terminal ID and the imaging of the target area are performed with the participation process of the end terminal (for example, the end terminal 541) to the access point 520 as a trigger. As a result, the terminal ID and the position coordinates of the newly arranged end terminal can be simultaneously acquired, and the terminal ID and the position coordinates can be easily associated with each other.

  FIG. 8 is a sequence diagram illustrating an example of the operation of generating correspondence information by the measurement system. First, the user places one end terminal (here, referred to as end terminal 541) in the target area 501, and turns on the power of the arranged end terminal 541. When the power is turned on (step S801), the end terminal 541 transmits a participation notification signal for notifying the access point 520 to join the network to the access point 520 (step S802).

  Next, the access point 520 assigns a terminal ID to the end terminal 541 based on the participation notification signal transmitted in step S802, and transmits a participation permission signal to the end terminal 541 (step S803). The participation permission signal includes a terminal ID (identification information) assigned to the end terminal 541, and the end terminal 541 communicates with the access point 520 using the terminal ID included in the participation permission signal. Communicate.

  Next, the access point 520 transmits the terminal ID assigned to the end terminal 541 to the measuring apparatus 510 (step S804). Next, the measuring apparatus 510 transmits an imaging command signal to the camera 530 (step S805). Next, the camera 530 captures an image of the target area 501 (step S806). Next, the camera 530 transmits the image data obtained in step S806 to the measurement apparatus 510 (step S807).

  Next, the measuring apparatus 510 specifies the position coordinates of the end terminal 541 based on the image data transmitted in step S807 (step S808). Next, the measuring apparatus 510 stores correspondence information in which the terminal ID transmitted in step S804 and the position coordinates specified in step S808 are associated with each other in the memory of the measuring apparatus 510 (step S809). End the operation.

  The above steps are executed each time the end terminal 541 is placed in the target area 501 and the power is turned on. Thereby, the measuring apparatus 510 can memorize | store the correspondence information which matched each terminal ID and each coordinate position of each end terminal (for example, end terminal 541) in the object area 501 with each other.

  FIG. 9 is a diagram (part 1) illustrating the specification of the position coordinates of the end terminal. As shown in FIG. 9, the user places the first end terminal 541 in the target area 501 and turns on the power of the end terminal 541. 8 is performed, and correspondence information between the terminal ID (001) of the end terminal 541 and the position coordinates of the end terminal 541 in the target area 501 is stored in the memory of the measuring apparatus 510. Is remembered.

  FIG. 10 is a diagram (part 2) illustrating the specification of the position coordinates of the end terminal. As shown in FIG. 10, the user similarly places the second and subsequent end terminals 542 to 549 one by one at different positions in the target area 501 and turns on the power. As a result, correspondence information between the terminal IDs (002 to 009) of the end terminals 542 to 549 and the position coordinates of the end terminals 542 to 549 in the target area 501 is stored in the memory of the measuring apparatus 510.

(Identification of end terminal position coordinates)
FIG. 11A is a diagram illustrating an example of an end terminal template. For example, the specifying unit 612 of the measuring apparatus 510 stores in advance templates 1110 of end terminals 541 to 549 made of 5 × 5 pixels as shown in FIG. 11A. Here, a case where the templates of the end terminals 541 to 549 are common will be described. However, different templates may be used for the end terminals 541 to 549, respectively.

  The template 1110 is defined by coordinates (x, y) in which the horizontal direction is x (x = 0 to 4) and the vertical direction is y (y = 0 to 4). In the template 1110, for example, coordinates (x, y) = (2, 2) are defined as the representative position 1111. The representative position 1111 is defined in advance by, for example, the position of the center of gravity of the end device.

  FIG. 11B is a diagram of an example of the image data of the target area. The camera 530 transmits, for example, image data 1120 illustrated in FIG. The image data 1120 is image data obtained by imaging the target area 501 and is image data of 10 × 15 pixels. Here, as indicated by reference numeral 1121, one end terminal (for example, end terminal 541) is shown in the image data 1120.

  12A to 12C are diagrams illustrating an example of matching. First, as illustrated in FIG. 12A, the specifying unit 612 superimposes the template 1110 on the image data 1120 so that the coordinates (0, 0) of the template 1110 match the coordinates (0, 0) of the image data 1120. . Then, the specifying unit 612 calculates the similarity between corresponding pixels of the template 1110 and the image data 1120.

  Next, the specifying unit 612 moves the template 1110 to a position where the coordinates (0, 0) of the template 1110 coincides with the coordinates (1, 0) of the image data 1120 as illustrated in FIG. The similarity between corresponding pixels of 1110 and image data 1120 is calculated again. As described above, the specifying unit 612 sequentially calculates the similarity between corresponding pixels of the template 1110 and the image data 1120 while performing raster scanning.

  When the raster scanning of the entire area of the image data 1120 is completed, the specifying unit 612 specifies the position coordinates of the template 1110 in the image data 1120 when the template 1110 and the image data 1120 are most similar. The position coordinates of the template 1110 in the image data 1120 are, for example, the position coordinates of the representative position 1111 of the template 1110 in the image data 1120.

  For example, as shown in FIG. 12C, when the coordinate (0, 0) of the template 1110 matches the coordinate (5, 2) of the image data 1120, the template 1110 and the image data 1120 are most similar. . In this case, the specifying unit 612 specifies the position coordinates (x1, y1) of the end terminal 541 as the coordinates (7, 4) of the representative position 1111 in the image data 1120. Similarly, the specifying unit 612 specifies the position coordinates of the end terminals 542 to 549 as coordinates (x2, y2),..., (X9, y9). Next, calculation of similarity between corresponding pixels of the template 1110 and the image data 1120 will be described.

<Calculation of similarity by SAD>
For example, the specifying unit 612 calculates the similarity using SAD (Sum of Absolute Difference). Specifically, the specifying unit 612 calculates a total R _SAD of absolute values of differences in gradation values between pixels by the following equation (1). In the following equation (1), the gradation value of each pixel of the template 1110 is T (i, j), and the gradation value of the image data 1120 is I (i, j). The identifying unit 612 determines that the image data 1120 and the template 1110 are more similar as the total R _SAD is smaller.

<Calculation of similarity by normalized cross-correlation>
Alternatively, the identifying unit 612 may calculate the degree of similarity using normalized cross-correlation (NCC). Specifically, the specifying unit 612 calculates a total _RNCC of absolute values of differences in gradation values between pixels by the following equation (2). In the following equation (2), the gradation value of each pixel of the template 1110 is T (i, j), and the gradation value of the image data 1120 is I (i, j). The identifying unit 612 determines that the image data 1120 and the template 1110 are more similar as the total _RNCC is closer to 1.

<Identification of the position coordinates of the second and subsequent end terminals>
FIG. 13 is a diagram illustrating an example of correspondence information generated by the association unit. The associating unit 622 generates, for example, a table 1300 illustrated in FIG. 13 as correspondence information. In the table 1300, position coordinates and terminal IDs are associated with each end terminal (Nos. 1 to 3). The association flag in the table 1300 is a flag indicating whether the position coordinates and the terminal ID are already associated with each end terminal.

  Here, no. For the end terminals 1 and 2, the position coordinates and the terminal ID are already associated with each other. The association flags 1 and 2 are “Done (= 1)”. No. For the end terminal of No. 3, no terminal ID is associated with the position coordinates. The association flag 3 is “not yet (= 0)”.

(Measurement of communication quality)
FIG. 14 is a flowchart illustrating an example of a communication quality measurement operation performed by the measurement apparatus. First, the measurement unit 613 transmits a radio wave acquisition command to the access point 520 (step S1401). Next, the measurement unit 613 determines whether or not the LQI and terminal ID of each end terminal have been received from the access point 520 (step S1402), and waits until they are received (step S1402: No loop).

  When the LQI and the terminal ID are received in step S1402 (step S1402: Yes), the generation unit 614 reads the correspondence information stored in the memory of the measurement device 510 (step S1403). Next, the generation unit 614 associates the position coordinates of each end terminal with the LQI based on the correspondence information read in step S1403 and the LQI and terminal ID received in step S1402 (step S1404).

  Specifically, the generation unit 614 acquires the position coordinates corresponding to the received terminal ID from the correspondence information, and associates the acquired position coordinates with the received LQI. Next, the output unit 615 outputs the association result obtained in step S1404 (step S1405), and ends the series of operations. Thereby, the measuring apparatus 510 can measure the communication quality at each position coordinate and output information in which the measured communication quality (LQI) is associated with the position coordinate.

  In this way, for example, after each correspondence information corresponding to a plurality of end terminals is generated by each step shown in FIG. 7, the communication quality of each end terminal corresponding to the plurality of correspondence information is measured. Thereby, each communication quality corresponding to the position coordinate of a some end terminal can be measured collectively.

  FIG. 15 is a sequence diagram illustrating an example of a communication quality measurement operation by the measurement system. First, measurement apparatus 510 transmits a radio wave acquisition command to access point 520 (step S1501). Next, the access point 520 transmits a radio wave acquisition command to each of the end terminals 541 to 549 (step S1502). Next, each of the end terminals 541 to 549 transmits the LQI measured based on the signal from the access point 520 to the access point 520 (step S1503).

  Next, the access point 520 transmits each LQI transmitted in step S1503 and each terminal ID of the end terminals 541 to 549 to the measuring apparatus 510 (step S1504). Next, the measuring apparatus 510 associates the position coordinates of each end terminal with the LQI based on the stored correspondence information and the LQI and terminal ID transmitted in step S1504 (step S1505). Next, the measuring apparatus 510 outputs the association result obtained in step S1505 (step S1506), and the series of operations ends.

  FIG. 16 is a diagram illustrating transmission of LQI by each end terminal. As illustrated in FIG. 16, when the access point 520 transmits a radio wave acquisition command to the end terminals 541 to 549, each of the end terminals 541 to 549 transmits an LQI to the access point 520. When receiving the LQI from the end terminals 541 to 549, the access point 520 transmits the received LQI and the corresponding terminal ID to the measuring apparatus 510.

(Output by output unit)
FIG. 17 is a diagram illustrating an example of information in which position coordinates are associated with LQIs. The output unit 615 of the measuring apparatus 510 outputs a table 1700 as information in which position coordinates and LQI (communication quality) are associated with each other. In the table 1700, the position coordinates and the LQI are associated with each end terminal (No. 1 to 7). Further, the output unit 615 may output only the position coordinates and the LQI in the table 1700. Thereby, the user can grasp the LQI at each position coordinate of the target area 501.

  FIG. 18 is a diagram illustrating an example of output from the output unit. The output unit 615 of the measuring apparatus 510 may output a three-dimensional diagram 1800 as shown in FIG. In the three-dimensional view 1800, bars 1801 to 1809 indicating LQI are displayed at each position of the target area 501. The higher the bars 1801 to 1809, the higher the LQI. Accordingly, the user can intuitively grasp the LQI distribution in the target area 501.

  19A to 19C are diagrams illustrating other examples of output by the output unit. Image data 1910 illustrated in FIG. 19A is image data captured by the camera 530. A CAD drawing 1920 shown in FIG. 19B is a CAD (Computer Aided Design) drawing of the target area 501 input to the measuring apparatus 510 in advance. The CAD drawing 1920 is a plan view of the target area 501 viewed from above.

  If the number of pixels in the horizontal direction of the image data 1910 is 640 [pixels] and the width of the CAD drawing 1920 is 19.2 [m], the scale of the CAD drawing 1920 relative to the image data 1910 is 0.03 [m / pixel]. Can be calculated. The generation unit 614 calculates the scale of the CAD drawing 1920 with respect to the image data 1910, and converts each position coordinate of the image data 1910 into a position coordinate of the CAD drawing 1920 based on the calculated scale.

  Then, the generation unit 614 outputs an image in which the LQI corresponding to each position coordinate is plotted at each position on the CAD drawing 1920 indicated by each converted position coordinate. For example, the generation unit 614 outputs an image obtained by plotting bars 1931 to 1937 indicating the size of the LQI at each position in the CAD drawing 1920 as an image 1930 illustrated in FIG. 19C. Thereby, the LQI of each position in the target area 501 can be shown on the CAD drawing 1920.

  As described above, according to the measurement system 500 according to the embodiment, the position coordinates of the end terminal 541 are specified based on the image data of the target area 501, and the communication quality of the end terminal 541 is measured. Can be output in association with each other. Thereby, the communication quality corresponding to the position coordinates of the target area 501 can be measured, and the measurement of the communication quality distribution of the target area 501 can be facilitated.

  For example, since the user can automatically perform the manual operation of plotting the arrangement of the end terminal 541 on paper with one hand on the paper and examining the scale to calculate the relative position, the communication quality distribution (the radio wave intensity distribution) is efficiently obtained. be able to. Further, based on the visualized communication quality distribution (for example, the image 1930 in FIG. 19-3), the user again measures the communication quality distribution, for example, by changing the direction of the antenna of the access point 520, and immediately visualizes the measurement result. can do. For this reason, the time of adjustment work, such as arrangement | positioning of the access point 520, can be shortened.

  For example, the user acquires the communication quality distribution (for example, the image 1930 in FIG. 19-3) of the target area 501 by the measurement system 500 with the antenna of the access point 520 adjusted in a certain direction. Further, the user slightly changes the direction of the access point 520 and acquires the communication quality distribution of the target area 501 again by the measurement system 500. And the user can grasp | ascertain the favorable direction of the antenna of the access point 520 by comparing each acquired communication quality distribution.

  Further, according to the measurement system 500, by storing correspondence information between terminal IDs and position coordinates related to a plurality of end terminals, each measured measurement quality can be measured even if the communication quality of the plurality of end terminals is collectively measured. It is possible to identify which position coordinate the communication quality corresponds to. For this reason, the communication quality in each position of the target area 501 can be measured collectively.

  For example, the user causes the measurement system 500 to execute the operations shown in FIGS. 8 and 15 with the antenna of the access point 520 adjusted in a certain direction. Thereby, the user can acquire the communication quality distribution of the target area 501. Next, the user changes the direction of the antenna of the access point 520 and causes the measurement system 500 to execute the operation shown in FIG. At this time, the operation shown in FIG. 8 can be omitted.

  Thereby, the user can acquire the communication quality distribution of the target area 501 in a state where the direction of the antenna of the access point 520 is changed. Thus, the user can acquire the communication quality distribution for each antenna direction by causing the measurement system 500 to perform the operation shown in FIG. 15 every time the antenna direction is changed. For this reason, the trouble of the adjustment work of the access point 520 can be reduced.

  In operation of the communication system 100 to be measured, a plurality of end terminals are usually used at the same time. On the other hand, according to the measurement system 500, the communication quality at a plurality of end terminals can be measured collectively, so the communication quality distribution can be measured in a state close to the interference state between the end terminals during operation. it can.

  Moreover, according to the measurement system 500, since the communication quality in several end terminals can be measured collectively, the accommodation capacity of the end terminals of the access points 111 to 113 of the communication system 100 can be measured. Accordingly, it is possible to test how many end terminals can be used simultaneously in the communication system 100.

  In the above-described embodiment, the case has been described where the arrangement of each end terminal in the target area 501 and the operation of the measurement apparatus 510 are performed by the user. On the other hand, the arrangement of each end terminal in the target area 501 and the operation of the measuring device 510 may be automatically performed by a robot or the like.

  As described above, according to the measurement device, the measurement method, the measurement system, and the measurement program, it is possible to easily measure the communication quality distribution.

  The measurement method described in this embodiment can be realized by executing a program prepared in advance on a computer such as a personal computer or a workstation. This program is recorded on a computer-readable recording medium such as a hard disk, a flexible disk, a CD-ROM, an MO, and a DVD, and is executed by being read from the recording medium by the computer. The program may be a transmission medium that can be distributed via a network such as the Internet.

  The following additional notes are disclosed with respect to the embodiment described above.

(Supplementary Note 1) Acquisition means for acquiring identification information of end terminals arranged in the target area;
Imaging means for imaging the target area;
Specifying means for specifying the position coordinates of the plurality of end terminals based on the imaging result of the imaging means;
Correspondence information that associates the identification information acquired by the acquisition means with each position coordinate specified by the specifying means is generated, and is included in the existing correspondence information among the position coordinates. Associating means for associating no position coordinates with the identification information;
Measuring means for measuring communication quality between the end terminal and the access point;
Generating means for generating information in which the position coordinates specified by the specifying means and the communication quality measured by the measuring means are related based on the correspondence information generated by the associating means;
Output means for outputting the information generated by the generating means;
A measuring apparatus comprising:

(Additional remark 2) The said acquisition means acquires the said identification information on the occasion of the participation process to the said access point of the said end terminal,
The measuring apparatus according to appendix 1, wherein the imaging unit images the target area triggered by the participation process.

(Supplementary note 3) The measurement unit measures the communication quality of each end terminal corresponding to the plurality of correspondence information after the plurality of correspondence information is generated by the association unit. 2. The measuring apparatus according to 2.

(Additional remark 4) The said measuring means measures the received power from the said access point in the said end terminal as said communication quality, The measuring apparatus as described in any one of additional marks 1-3 characterized by the above-mentioned.

(Additional remark 5) The said measuring means measures the received power from the said end terminal in the said access point as said communication quality, The measuring apparatus as described in any one of additional marks 1-3 characterized by the above-mentioned.

(Additional remark 6) The said production | generation means produces | generates the image data which plotted the said communication quality on the position of the said position coordinate in the image data which shows the said target area as said information, The any one of Additional remarks 1-5 characterized by the above-mentioned. Measuring device.

(Supplementary Note 7) An acquisition step of acquiring identification information of end terminals arranged in the target area;
An imaging step of imaging the target area;
A specifying step of specifying each position coordinate of the plurality of end terminals based on the imaging result of the imaging step;
Correspondence information that associates the identification information acquired by the acquisition step with each position coordinate specified by the specifying step is generated, and is included in the existing correspondence information among the position coordinates. An associating step of associating no position coordinates with the identification information;
A measuring step of measuring communication quality between the end terminal and the access point;
Based on the correspondence information generated by the association step, a generation step of generating information associating the position coordinates specified by the specification step and the communication quality measured by the measurement step;
An output step of outputting information generated by the generation step;
A measurement method comprising:

(Appendix 8) A plurality of end terminals arranged in the target area;
A camera,
An access point for measuring communication quality with the end terminal;
The measuring device according to any one of appendices 1 to 6,
And the imaging means controls the camera to image the target area.

(Appendix 9)
Acquisition means for acquiring identification information of an end terminal arranged in the target area;
Imaging means for imaging the target area;
Identifying means for identifying each position coordinate of the plurality of end terminals based on the imaging result of the imaging means;
Correspondence information that associates the identification information acquired by the acquisition means with each position coordinate specified by the specifying means is generated, and is included in the existing correspondence information among the position coordinates. Association means for associating no position coordinates with the identification information;
Measuring means for measuring communication quality between the end terminal and the access point;
Generating means for generating information associating the position coordinates specified by the specifying means with the communication quality measured by the measuring means based on the correspondence information generated by the associating means;
Output means for outputting the information generated by the generating means;
A measurement program characterized by operating as

DESCRIPTION OF SYMBOLS 100 Communication system 111-113,520 Access point 120 Computer 131-137,541-549 End terminal 201-203 Received power 411,412 Antenna 421 Direct wave 422 Reflected wave 500 Measuring system 510 Measuring apparatus 1110 Template 1111 Representative position 1120, 1910 Image data 1800 3D view 1801-1809, 1931-1937 Bar 1920 CAD drawing 1930 Image

Claims (4)

Acquisition means for acquiring identification information of the end terminals arranged in the target area;
Imaging means for imaging the target area;
Specifying means for specifying the position coordinates of the plurality of end terminals based on the imaging result of the imaging means;
Correspondence information that associates the identification information acquired by the acquisition means with each position coordinate specified by the specifying means is generated, and is included in the existing correspondence information among the position coordinates. Associating means for associating no position coordinates with the identification information;
Measuring means for measuring communication quality between the end terminal and the access point;
Generating means for generating information in which the position coordinates specified by the specifying means and the communication quality measured by the measuring means are related based on the correspondence information generated by the associating means;
Output means for outputting the information generated by the generating means;
A measuring apparatus comprising: An acquisition step of acquiring identification information of end terminals arranged in the target area;
An imaging step of imaging the target area;
A specifying step of specifying each position coordinate of the plurality of end terminals based on the imaging result of the imaging step;
Correspondence information that associates the identification information acquired by the acquisition step with each position coordinate specified by the specifying step is generated, and is included in the existing correspondence information among the position coordinates. An associating step of associating no position coordinates with the identification information;
A measuring step of measuring communication quality between the end terminal and the access point;
Based on the correspondence information generated by the association step, a generation step of generating information associating the position coordinates specified by the specification step and the communication quality measured by the measurement step;
An output step of outputting information generated by the generation step;
A measurement method comprising: Multiple end terminals located in the target area;
A camera,
An access point for measuring communication quality with the end terminal;
A measuring device according to claim 1;
And the imaging means controls the camera to image the target area. Computer
Acquisition means for acquiring identification information of an end terminal arranged in the target area;
Imaging means for imaging the target area;
Identifying means for identifying each position coordinate of the plurality of end terminals based on the imaging result of the imaging means;
Correspondence information that associates the identification information acquired by the acquisition means with each position coordinate specified by the specifying means is generated, and is included in the existing correspondence information among the position coordinates. Association means for associating no position coordinates with the identification information;
Measuring means for measuring communication quality between the end terminal and the access point;
Generating means for generating information associating the position coordinates specified by the specifying means with the communication quality measured by the measuring means based on the correspondence information generated by the associating means;
Output means for outputting the information generated by the generating means;
A measurement program characterized by operating as

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