JP2016139893A - Measurement device and measurement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measurement device and a measurement method that enable grasping of a radio wave environment in a house.SOLUTION: A measurement device 1 comprises a measuring unit 151 for measuring the intensity of electric waves received from a self access point 100 at each of plural measurement positions and the intensity of electric waves received from another access point 200 at each of the plural measurement positions, and a specifying unit 154 for comparing measurement results of electric waves at each of the plural measurement positions to calculate the similarity among the measurement positions, thereby specifying the positional relationship of the respective measurement positions.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a measuring apparatus and a measuring method for measuring radio waves transmitted from a parent device.

  With the spread of wireless communication technology, it is widely used to establish a wireless environment unique to each user's home by installing a wireless LAN access point (base unit) in the home. In a wireless environment built in the home, good communication is possible near the installation location of the access point, but radio waves from the access point do not reach the location far from the installation location, and good communication may be difficult. is there. Such a place is called a so-called “dead point”, and it is preferable to construct a wireless environment so that there is no dead point in the house.

Therefore, in recent years, a relay device that relays the radio waves of the access point is installed at a position different from that of the access point, and the dead point is eliminated by causing the radio waves to reach a wider range.
Since the relay device needs to be installed in a range where the radio waves of the access point can reach, conventionally, it has been verified whether or not the throughput is sufficiently provided at the planned installation location of the relay device. For example, Patent Document 1 discloses a measurement apparatus that calculates a frame error rate in communication with an access point at a planned installation position, and calculates the throughput at the position based on the theoretical value of the throughput and the frame error rate. Has been proposed.

Japanese Patent No. 4675743

  However, simply installing the relay device at a position where the throughput is sufficient may not solve the dead point appropriately. FIG. 9 is a diagram illustrating an example of a floor plan of a user's house where a wireless LAN access point is installed. In the example shown in FIG. 9, since an access point is installed in a room in the house, a place away from the room (for example, a washroom) is a dead spot.

If the influence of an obstacle such as a wall is ignored for the sake of simplicity, the radio wave attenuates according to the distance, so that the throughput is the same at a plurality of points equidistant from the access point. In this regard, in the example shown in FIG. 9, the points A and B are illustrated as points where a sufficient throughput can be secured.
Here, since the point A is further away from the dead point than the installation position of the access point, even if a relay device is installed at the point A, the dead point cannot be eliminated. On the other hand, since the point B is a position between the access point and the dead point, it is expected that the dead point can be eliminated by installing a relay device at the point B.

  Thus, even if a sufficient throughput can be ensured, it may not be preferable as the installation location of the relay device. Such a problem occurs because radio waves cannot be visually recognized and it is difficult to grasp the radio wave environment in the home, and a mechanism for solving the problem is required.

  The present invention has been made in response to such a request. The first object of the present invention is to make it possible to grasp the radio wave environment in the home, and to estimate the preferred installation position of the relay device using the result. Second purpose.

  In the first aspect of the present invention, a measurement apparatus capable of wireless communication with a parent device that emits radio waves, the first radio wave intensity being the strength of the radio wave received from the parent device at each of a plurality of positions, And a measurement unit that measures the second radio wave intensity, which is the radio wave intensity received from a radio wave transmitter other than the parent device, and a specification that identifies the relationship between the positions based on the radio wave measurement results at each position And a measuring device.

Also, by comparing the measurement results of radio waves at each position, the similarity calculation unit that calculates the similarity of the radio wave environment at each of the plurality of positions, and the distance between the positions is closer as the similarity is higher And a distance calculation unit that calculates the distance between the plurality of positions by setting the distances to be farther as the similarity is lower, and the specifying unit includes the plurality of positions. The relationship between the reference position and other positions may be specified based on the calculated distance, with the position having the highest first radio wave intensity as the reference position.

  Further, the measurement unit measures time information when the radio field intensity is measured together with the radio field intensity at each position, and the distance calculation unit adds the time information to the calculated similarity, It is also possible to calculate the distance between a plurality of positions.

  Moreover, the said specific | specification part specifies the said relationship about the several position except the said 1st position or the said 2nd position, when the said similarity of a 1st position and a 2nd position is more than a threshold value. It is good.

  Further, the similarity calculation unit may calculate the similarity by weighting the first radio wave intensity with respect to the second radio wave intensity.

  In addition, a position where the distance from the reference position is within the first distance and the distance from the dead position where the first radio wave intensity is equal to or less than the threshold is within the second distance is defined as the radio wave of the base unit. It is good also as providing the estimation part which estimates as an installation candidate position of the relay apparatus which relays.

  In addition, when there are a plurality of insensitive positions among the plurality of positions, the estimation unit has a distance from the reference position within the first distance, and distances from all the insensitive positions are A position that is within the second distance or a position that is within the first distance and that is closest to each of the plurality of insensitive positions is estimated as the installation candidate position. It is good to do.

  Moreover, it is good also as providing further the memory | storage part which memorize | stores the floor plan information of the building in which the said main | base station is installed, and the setting part which matches each of these several position which specifies the said relationship with the said floor plan of the building. .

  In the second aspect of the present invention, the first radio wave intensity that is the intensity of the radio wave received from the parent device and the intensity of the radio wave that is received from a radio wave transmitter other than the parent machine at each of the plurality of positions. (2) A measurement method including a step of measuring radio field intensity and a step of specifying a relationship between positions based on a measurement result of radio waves at each position is provided.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to grasp | ascertain the electromagnetic wave environment in a house, the preferable installation position of a relay apparatus can be estimated.

It is a figure which shows the outline | summary of the measuring method of the electromagnetic wave environment in a house by a measuring device. It is a block diagram which shows the function structure of a measuring apparatus. It is a figure which shows an example of the radio field intensity which the measurement part measured. It is a figure which shows the production | generation method of the graph which shows the relationship between each measurement position. It is a figure which shows the production | generation method of the graph which shows the relationship between each measurement position. It is a figure which shows an example of the produced | generated graph. It is a figure which shows an example of the radio wave environment map which displays visually the radio wave environment in a house. It is a flowchart which shows the flow of a process of a measuring device. It is a figure which shows the relationship between the dead point in a house, and the installation position of a relay apparatus.

[Outline of measurement method of radio wave environment]
First, with reference to FIG. 1, an outline of a method for measuring a radio wave environment in a house by the measuring apparatus 1 of the present invention will be described. The measuring device 1 is a terminal device capable of wireless communication with the access point 100 (master device), and is, for example, a mobile terminal such as a smartphone or a tablet terminal.

  The access point 100 is a wireless LAN access point, and constructs a communication area where the measurement apparatus 1 can perform wireless communication by transmitting radio waves. Note that, in a situation where a unique communication area is constructed for each user's home as in recent years, the measurement apparatus 1 receives radio waves from a plurality of access points at the same time. Hereinafter, an access point connected to the measuring apparatus 1 is referred to as a local access point 100, and an access point other than the local access point 100 is referred to as another access point 200. As an example, the own access point 100 is installed in the home of a user who uses the measuring apparatus 1, and the other access point 200 is installed in another user's home near the user's home.

In the measurement method using the measuring device 1, the user moves the house with the measuring device 1 and measures the radio field intensity of the radio wave received at the position at each of a plurality of positions. The measuring device 1 specifies the radio wave environment at each position from the measurement result of the radio wave intensity, and calculates the distance between the respective positions based on the similarity of the radio wave environment at each position. For example, the measurement apparatus 1 calculates that the distance between the positions is closer as the radio wave environment is similar, and the distance between the positions is longer as the radio environment is not similar.
At this time, since the measuring apparatus 1 measures not only the radio field intensity of the radio wave received from the own access point 100 but also the radio field intensity of the other access point 200 simultaneously received at the position, the accuracy of similarity determination can be increased. .

  Here, the distance calculated based on the similarity of the radio wave environment is a scale indicating the communication quality when communication is performed between the respective positions, and is different from the physical distance. For example, although the physical distance between the positions adjacent to each other across the wall is close, even if communication is performed between the respective positions, the communication quality may be deteriorated because the wall is interposed. Even if the physical distance is close between such positions, the similarity of the radio wave environment is low, and it is calculated that the distance is long.

In this way, by calculating the distance between each position based on the similarity of the radio wave environment, it is possible to grasp the radio wave environment in the house, that is, the connection of communication between a position in the house and another position. can do.
Hereinafter, the measuring apparatus 1 of the present invention will be described. In the present embodiment, as a result of the user carrying the measurement device 1 and moving, the measurement device 1 measures the radio wave environment at eight measurement positions in order from the measurement position 1 to the measurement position 8. In the example shown in FIG. 1, the measurement position 1 is in the vicinity of the own access point 100, and the measurement position 8 is a dead point where the radio wave of the own access point 100 does not reach.

[Configuration of Measuring Device 1]
FIG. 2 is a block diagram showing a functional configuration of the measuring apparatus 1 of the present invention. As shown in FIG. 2, the measuring apparatus 1 includes a storage unit 11, a display unit 12, an operation unit 13, a communication unit 14, and a control unit 15.

The storage unit 11 is a memory such as a ROM and a RAM, or a storage medium such as a hard disk. The storage unit 11 stores a program and various data for operating the control unit 15. In addition, the storage unit 11 stores floor plan information of a user's house where the access point 100 is installed.
The display unit 12 includes a liquid crystal display, an organic EL (Electro-Luminescence) display, and the like, and displays various information based on the control of the control unit 15.

The operation unit 13 includes, for example, a button, a contact sensor arranged so as to overlap the display unit 12, and receives an operation input from the user.
The communication unit 14 communicates with an external device by wire or wireless. For example, the communication unit 14 communicates with the own access point 100 via a predetermined wireless communication technology such as WiFi (registered trademark) and receives radio waves transmitted from the other access point 200.

  The control unit 15 is, for example, a CPU, and controls the measurement apparatus 1 by executing a program stored in the storage unit 11, and measures the measurement unit 151, the similarity calculation unit 152, the distance calculation unit 153, the specifying unit 154, and the estimation. Functions as a unit 155 and a setting unit 156.

The measurement unit 151 measures the radio field intensity of a radio wave received from the own access point 100 and the radio field intensity of a radio wave received from another access point 200 at each of a plurality of measurement positions. Moreover, the measurement part 151 acquires the time information at the time of measuring the said radio field intensity with the radio field intensity of the own access point 100 and the other access point 200 in each position.
When the measurement unit 151 measures the radio field intensity and the time information, the measurement unit 151 stores the measured radio field intensity and the time information in the storage unit 11 in association with each other.

Here, an example of the radio wave intensity measured by the measurement unit 151 is shown in FIG. In FIG. 3, “AP1” indicates the own access point 100, and “AP2” to “AP8” indicate other access points. Also, in the following, in order to simplify the explanation, when the radio wave intensity of the corresponding access point is equal to or higher than a predetermined value (for example, −70 dBm), “1” is set for the access point, which is less than the predetermined value. In this case, “0” is set. Here, the threshold value of the radio wave intensity may be different for each access point. As an example, the threshold value of the radio wave intensity is set to −50 dBm for the own access point 100, and the threshold value of the radio wave intensity is set for the other access points 200. May be set to −70 dBm.
Further, instead of “0, 1”, the value of the radio wave intensity of each access point measured at the measurement position may be set.

  In the example shown in FIG. 3, it can be seen that at the measurement position 1, the radio wave intensity of a predetermined level or higher is received from the own access point 100 (AP 1) and the other access points 200 (AP 2, AP 3, AP 5). Further, at the measurement position 8, it is understood that the radio wave intensity of a predetermined level or higher is not received from the own access point 100 and the measurement position 8 is a dead point.

Returning to FIG. 2, the similarity calculation unit 152 calculates the similarity of the radio wave environment at each of the plurality of measurement positions by comparing the measurement results of the radio waves at the respective measurement positions (see FIG. 3). When “0, 1” is used as the measurement result as in the present embodiment, the similarity calculation unit 152 calculates a logical product of the measurement result at one measurement position and the measurement result at another measurement position, The similarity of the radio wave environment between the measurement positions is calculated. Specifically, a similarity is calculated by calculating a logical product for each identical access point between one measurement position and another measurement position, and calculating the sum. A larger calculated logical product means a measurement position with a similar radio wave environment, and a smaller logical product means a measurement position with a similar radio wave environment.
Referring to the example illustrated in FIG. 3, when calculating the similarity between the measurement position 1 and the measurement position 2, an access point in which “1” is set in both the measurement position 1 and the measurement position 2 is “AP1 "AP2", "AP3" and "AP5". Therefore, the logical product of both is “4”. Note that the same access point at both measurement positions can be determined by using the SSID or ESSID of the access point.

Note that the similarity calculation method using the logical product is merely an example for calculating the similarity of the radio wave environment, and the similarity may be calculated using other methods. For example, in the case where the accuracy is improved by adding not only the number of access points having “1” set to both but also the number of access points having “0” set to both, Instead, a negative exclusive OR may be used. Similarly, any other logical expression (logical sum, logical product, negation of each, etc.) may be used.
In addition, when using a negative exclusive OR, the number of access points that are set to “1” on both sides and the number of access points that are set to “0” on both sides are weighted respectively. It may be different. Also, in calculating similarity using an arbitrary logical expression, “1” is an access point that measures radio field strength above a predetermined level, “0” is an access point that is less than a predetermined level but can measure radio field strength, Access points that could not be observed may be excluded from the similarity calculation.

  Also, the similarity calculation method naturally changes depending on how the radio field intensity is set with respect to the measurement position. When the radio field intensity value is set as it is, the similarity of the value is not the logical product or the like. By calculating, the similarity of the radio wave environment is calculated. As an example, the similarity calculation unit 152 calculates the similarity by an arbitrary method such as a mean square error (similar if the mean square error is less than a certain value, and not similar if the mean square error is greater than a certain value).

The similarity calculation unit 152 may calculate the similarity after appropriately weighting. In order to grasp the radio wave environment in the home, it may be preferable to focus on the radio field strength of the own access point 100 installed in the home rather than the other access point 200 installed outside the home. Therefore, the similarity calculation unit 152 may calculate the similarity by weighting the radio field intensity of the own access point 100 more than the radio field intensity of the other access point 200.
As an example, when the radio wave strength of the own access point 100 is not similar, but the radio wave strengths of some of the other access points 200 are similar, the similarity calculation unit 152 reduces the similarity between the measurement positions. It may be calculated.

  In addition, when using a negative exclusive OR as described above, the number of access points that are set to “1” on both sides (the number of access points at which radio field intensity of a predetermined level or more is measured at both measurement positions) and The sum of the number of access points set to “0” on both sides (the number of access points at which radio field intensity less than a predetermined value is measured at both measurement positions) is used. The number of access points for which “0” is set may be weighted more than the number of access points for which “0” is set for both.

The distance calculation unit 153 calculates the distance between the measurement positions based on the calculated similarity. Specifically, the distance calculation unit 153 determines that the distance between the measurement positions is closer as the calculated similarity is higher, and the distance between the measurement positions is longer as the similarity is lower. Calculate the distance between them.
The distance calculation unit 153 may calculate the distance between a plurality of measurement positions by adding the time information at which the radio wave intensity is measured to the calculated similarity. When the user moves in the house and measures the radio field intensity, the measurement positions close to each other in time series are close to the physical position. Therefore, when there are a plurality of measurement positions having similarities with respect to a certain measurement position, the distance calculation unit 153 may determine that the measurement position with a close time is closer to the measurement position with a long time.

The specifying unit 154 specifies the radio wave environment in the home based on the calculated distance. Specifically, the specifying unit 154 calculates the relationship between the reference position and other positions using the measurement position with the strongest radio wave intensity of the own access point 100 among the plurality of measurement positions as the reference position. Identify based on. For example, the specifying unit 154 generates a graph G illustrated in FIG. 6A based on the specified relationship, and makes it possible to grasp the radio wave environment in the house.
As shown in FIG. 6A, the graph G is obtained by connecting each node based on the distance based on the similarity of the radio wave environment with each measurement position as a node. Hereinafter, a method for generating the graph G will be described with reference to FIGS. 4 to 6.

As described above, in the present embodiment, the user who has the measuring device 1 moves around the house and measures the radio field intensity at each of a plurality of measurement positions. Here, when the distance between one measurement position and another measurement position is too close, it is sufficient to use only one of the measurement positions as the graph G to be generated. Therefore, when there is a measurement position whose similarity is equal to or higher than the threshold, the specifying unit 154 specifies the relationship between the measurement positions except for one of the measurement positions.
As shown in FIG. 4A, the similarity (logical product) between the measurement position 1 and the measurement position 2 is “4”, and the similarity between the measurement position 1 and the measurement position 3 is “2”. As an example, when the threshold is “4”, the similarity between the measurement position 1 and the measurement position 2 is equal to or greater than the threshold, and the similarity between the measurement position 1 and the measurement position 3 is less than the threshold. Therefore, in this embodiment, as shown in FIG. 4B, the measurement position 2 is excluded from the nodes constituting the graph G. Since the maximum value of the logical product varies depending on the number of other detected access points 200, the threshold is preferably set (normalized) based on the number of detected access points.

Further, in the above description, after each measurement position is adopted as a node of the graph G, one of the adjacent nodes is excluded, but one of the adjacent measurement positions may not be adopted as a node in the first place. . Specifically, when a new measurement value is obtained in a state where the measurement apparatus 1 measures the radio wave intensity at a predetermined interval (for example, a high frequency such as an interval of 0.5 seconds), the measurement value is updated to the latest measurement value. Compare with measured value. At this time, if the new measurement value is not similar to the latest measurement value, the measurement value is adopted as a node. If the new measurement value is similar to the latest measurement value, the measurement value is set to the node. It is good also as not adopting as.
Note that if an outlier is subtracted in the measurement of the radio field intensity, it may be adopted as a node of the graph even though it is originally close. Therefore, when the radio field intensity is measured a plurality of times and a result of low similarity is measured a plurality of times, the node to be adopted may be determined.

As a result, measurement positions 1, 3 to 8 remain as measurement positions corresponding to the nodes constituting the graph G. FIG. 5A shows the similarity calculated by the similarity calculation unit 152 for each of these measurement positions. The distance calculation unit 153 calculates the distance between each measurement position from the calculated similarity. FIG. 5B shows the distance between the measurement positions calculated by the distance calculation unit 153.
The distance calculation unit 153 assumes that the distance between the measurement positions is closer as the calculated similarity is higher, and the distance between the measurement positions is longer as the similarity is lower. As an example, the reciprocal of the similarity may be the distance between the measurement positions. However, in the example illustrated in FIG. 5, the similarity “3” is the distance “1” and the similarity “2” is the distance “ 2 ”, similarity“ 1 ”is distance“ 3 ”, and similarity“ 0 ”is distance“ ∞ ”.

When the distance calculation unit 153 calculates the distance between the measurement positions, the specifying unit 154 connects the measurement positions (nodes) based on the calculated distance, and generates a graph G illustrated in FIG. In addition, the numerical value attached | subjected to the edge which connects between measurement positions in FIG. 6 (A) has shown the distance between the said measurement positions.
Here, the conditions for connecting the respective measurement positions can be arbitrarily set as appropriate. In the case of the present embodiment, one measurement position and the next measurement position of the measurement position (for example, measurement position 3 with respect to measurement position 1) are basically connected, and with respect to the one measurement position, When there is another measurement position having a distance shorter than the distance between the next measurement position, the one measurement position and the other measurement position are connected (for example, measurement is performed with respect to the measurement position 1). Position 4,5). On the other hand, the relationship between one measurement position and other measurement positions that are equal to or greater than the distance from the next measurement position (for example, measurement positions 6 and 7 with respect to measurement position 1) and the distance “∞” There is no connection between the measurement positions (for example, measurement position 8 with respect to measurement position 1). Thereby, a graph G shown in FIG. 6A is generated.

Returning to FIG. 2, the estimation unit 155 estimates the installation candidate position of the relay device that relays the radio wave of the own access point 100 based on the relationship between the respective measurement positions specified by the specification unit 154. Specifically, a dead point (the minimum distance from the reference position (measurement position 1) with the strongest radio wave intensity of the own access point 100 is within the first distance and the radio wave intensity of the own access point 100 is equal to or less than a threshold value ( The position where the minimum distance from the measurement position 8) is within the second distance is estimated as the installation candidate position of the relay device.
The first distance and the second distance may be different distances or the same distance. As an example, when both the first distance and the second distance are “4”, as shown in FIG. 6B, the minimum distance from the reference position is “3” and the minimum distance from the dead point is “3”. The measurement position 6 that is “4” is estimated as the installation candidate position of the relay apparatus.

  By the way, the dead point existing in the house is not limited to one place, and there may be a plurality of dead points in the house. In such a case, the estimation unit 155 determines the measurement position where the minimum distance from the reference position is within the first distance and the minimum distance from all the dead points is within the second distance as the relay device installation candidate. Estimated as position. In addition, since such a measurement position may not exist in a plurality of measurement positions, the estimation unit 155 has a minimum distance from the reference position within the first distance, and between each insensitive point. The measurement position that is closest to the minimum distance may be estimated as the installation candidate position.

Returning to FIG. 2, the setting unit 156 associates each of the plurality of measurement positions that specify the relationship with the floor plan of the user's house. Specifically, the setting unit 156 reads the floor plan information of the user's home from the storage unit 11, and associates the indoor radio wave environment specified by the specifying unit 154 with the floor plan information. Note that the floor plan information and the measurement position can be arbitrarily associated with each other, as shown in FIG. FIG. 7 is a radio wave environment map that visually displays the radio wave environment in the house.
In the radio wave environment map illustrated in FIG. 7, the distance that the area corresponding to each measurement position is separated from the installation position (measurement position 1) of the own access point 100 is visually displayed. For example, in a room next to the room where the own access point 100 is installed (area of the measurement positions 3 and 5), a part of the room (area of the measurement position 5) is at a short distance from the own access point 100. It can be seen that the other part (the region of measurement position 3) is at a near-medium distance from the own access point 100.

In addition, the position in the house where the measurement position is located can be specified by an arbitrary method. For example, when latitude / longitude information is included as the floor plan information, the position of the measurement position can be specified by using GPS information, an acceleration sensor, or the like. Alternatively, the position of the measurement position may be specified by receiving an input from the user regarding where to locate in the house at the time when the radio field intensity is measured.
In addition, the area corresponding to the measurement position can be specified based on the position of the specified measurement position and the floor plan information. Since the factor that greatly affects the radio wave environment in the home is the presence or absence of a wall, for example, a range surrounding the position of the specified measurement position with the wall can be specified as an area corresponding to the measurement position. At this time, when there are a plurality of measurement positions with different distances from the own access point 100 within the same range (in the same room), the room is appropriately divided by an arbitrary method.

[Processing of measuring apparatus 1]
The configuration of the measuring apparatus 1 according to the present invention has been described above. Subsequently, the flow of processing by the measuring apparatus 1 of the present invention will be described. FIG. 8 is a flowchart showing a process flow of the measuring apparatus 1.
As shown in FIG. 8, first, in step S <b> 1, the measurement unit 151 of the measurement apparatus 1 measures the radio wave intensity of the radio waves transmitted from the plurality of access points at each of the plurality of measurement positions, and stores it in the storage unit 11. Remember. Subsequently, in step S2, the similarity calculation unit 152 of the measurement apparatus 1 calculates the similarity of the radio wave environment at each of the plurality of measurement positions. At this time, when there is a measurement position whose similarity in the radio wave environment is equal to or greater than the threshold, in step S3, the specifying unit 154 of the measurement apparatus 1 excludes any of the measurement positions.

  Subsequently, in step S4, the distance calculation unit 153 of the measurement apparatus 1 calculates the distance between the measurement positions based on the similarity calculated in step S2. When the specifying unit 154 specifies the relationship between the reference position and other measurement positions based on this distance, the estimation unit 155 then refers to this relationship in step S5, and the relay device installation candidate position. Is estimated. Specifically, the estimation unit 155 selects the measurement position where the minimum distance from the reference position is within the first distance and the minimum distance from the dead point is within the second distance as the installation candidate position of the relay device. presume.

  Subsequently, in step S6, the setting unit 156 of the measurement device 1 correlates each of the plurality of measurement positions with the floor plan information of the user's home, thereby visually displaying the radio environment in the home. An environment map is generated and displayed on the display unit 12.

[Effect of measuring apparatus 1]
In the above, the measuring apparatus 1 of this invention was demonstrated. The measuring apparatus 1 compares the measurement results of the radio field intensity of the own access point 100 and the radio field intensity of the other access point 200 at each of a plurality of measurement positions, and calculates that the distance between measurement positions with similar measurement results is close. The distance between the measurement positions where the measurement results are not similar is calculated to be long. Then, in the measuring apparatus 1, the measurement position where the radio wave intensity of the own access point 100 is the strongest is assumed to be the installation position of the own access point 100, and the relationship between the measurement position and other measurement positions is based on the calculated distance. To identify.
As a result, since the distance from the own access point 100 to each measurement position, that is, the ease of connection to the own access point 100 at the measurement position, can be grasped, the radio waves in the house where the own access point 100 is installed It is possible to grasp the environment.

  Note that the measurement apparatus 1 specifies the relationship between the measurement positions except for one of the measurement positions when the measurement results of the radio field intensity are similar to each other at a certain measurement position and other measurement positions. Therefore, the radio wave environment in the house can be shown briefly.

In addition, since the measuring apparatus 1 can grasp the radio wave environment in the home where the own access point 100 is installed, the installation candidate position of the relay apparatus that relays the radio wave of the own access point 100 can be easily grasped. Specifically, in the measurement apparatus 1, the installation position of the own access point 100 in the home (the measurement position where the radio wave intensity of the own access point 100 is the strongest) and the dead point (the measurement position where the radio wave intensity of the own access point 100 is less than or equal to the threshold) ) As the starting points, the distances from the starting points to the respective measurement positions can be grasped, so that the measurement positions existing between the two positions can be estimated as suitable installation candidate positions of the relay apparatus.
The same applies to the case where there are a plurality of dead spots, and a suitable installation candidate position of the relay device can be estimated based on the distance from the installation position of the own access point 100 and the distance from each dead spot. .

  Moreover, in the measuring apparatus 1, the information which can grasp | ascertain visually the radio wave environment in a house like the radio wave environment map illustrated in FIG. 7 is produced | generated by matching the floor plan information of a building, and the relationship between measurement positions. Therefore, the user can appropriately grasp the radio wave environment in the house.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. In particular, the specific embodiments of the distribution / integration of the devices are not limited to those illustrated above, and all or a part thereof may be added in arbitrary units according to various additions or according to functional loads. It can be configured functionally or physically distributed and integrated.

For example, in the above embodiment, the radio wave intensity is continuously measured from the measurement position 1 to the measurement position 8 as the user moves. However, the measurement of the radio wave intensity at each measurement position is limited to that performed continuously. Is not something For example, the radio wave measurement result may be saved as log information on a daily basis, and the relationship between the measurement positions may be specified using the log information at a predetermined timing. Note that the log information includes at least radio wave intensity, and includes time information as necessary. Further, when it is necessary to associate with the floor plan information of the house, the position information (latitude and longitude) of the measurement position is further included.
At this time, the radio wave intensity of the access point at the measurement position may change with time, so the radio wave intensity is measured within a predetermined time from the timing of specifying the relationship between the measurement positions without using old log information. It is preferable to use only the log information of the measured position.

  Further, in the above embodiment, the graph G is generated using the radio wave intensity of another access point (WiFi master unit), but the radio wave to be used is not limited to this, and Bluetooth (registered trademark) It is good also as using other arbitrary radio waves, such as a radio wave.

Further, the method for generating the graph G, that is, the condition for connecting the respective measurement positions (nodes) is not limited to the above embodiment. As another example, the similarity (distance) of the radio wave environment is calculated for all the node pairs, node pairs whose similarity is greater than or equal to the first threshold are connected by edges, and node pairs whose similarity is less than the first threshold are connected by edges. You may not.
In addition, node pairs whose similarity is equal to or higher than a second threshold value that is higher than the first threshold value may be merged. In this case, node pairs that are less than the second threshold and greater than or equal to the first threshold are connected by edges. Note that either one of the measurement values of the radio wave intensity at the merged node may be used, or an average value of the measurement values of each node before merging may be employed.

DESCRIPTION OF SYMBOLS 1 ... Measuring apparatus 11 ... Memory | storage part 12 ... Display part 13 ... Operation part 14 ... Communication part 15 ... Control part 151 ... Measuring part 152 ... Similarity calculation part 153: Distance calculating unit 154: Specifying unit 155 ... Estimating unit 156 ... Setting unit 100 ... Own access point 200 ... Other access point

Claims (9)

A measuring device capable of wireless communication with a parent device that emits radio waves,
A measurement unit that measures a first radio wave intensity that is the intensity of a radio wave received from the master unit and a second radio wave intensity that is the intensity of a radio wave received from a radio wave transmitter other than the master machine at each of a plurality of positions; ,
Based on the measurement results of radio waves at each position, a specifying unit that identifies the relationship between the positions,
A measuring apparatus comprising: A similarity calculation unit that calculates the similarity of the radio wave environment at each of the plurality of positions by comparing the measurement results of the radio waves at the respective positions;
A distance calculation unit that calculates the distance between the plurality of positions by setting the distance between the positions to be closer as the similarity is higher and setting the distance as the similarity is lower.
Further comprising
The specifying unit specifies a relationship between the reference position and another position based on the calculated distance, with a position having the strongest first radio wave intensity among the plurality of positions as a reference position.
The measuring apparatus according to claim 1. The measurement unit measures time information when the radio field intensity is measured together with the radio field intensity at each position,
The distance calculation unit calculates the distance between the plurality of positions by adding the time information to the calculated similarity.
The measuring apparatus according to claim 2. The specifying unit specifies the relationship with respect to a plurality of positions excluding the first position or the second position when the similarity between the first position and the second position is equal to or greater than a threshold;
The measuring apparatus according to claim 2 or 3. The similarity calculation unit calculates the similarity by weighting the first radio field intensity more than the second radio field intensity;
The measuring apparatus of any one of Claim 2 to 4. Relay the radio wave of the base unit to a position where the distance from the reference position is within the first distance and the distance from the dead position where the first radio wave intensity is below the threshold is within the second distance An estimation unit that estimates the candidate position of the relay device to be installed,
The measuring apparatus according to claim 2, further comprising: When the estimation unit includes a plurality of the insensitive positions among the plurality of positions,
A position where the distance from the reference position is within the first distance and the distance from all the dead positions is within the second distance, or
A position that is within the first distance from the reference position and that is closest to each of a plurality of distances from the dead position is estimated as the installation candidate position.
The measuring apparatus according to claim 6. A storage unit for storing floor plan information of the building in which the master unit is installed;
A setting unit that associates each of the plurality of positions that specify the relationship with the floor plan of the building;
The measuring apparatus according to claim 1, further comprising: Measuring a first radio wave intensity that is the intensity of a radio wave received from a master unit and a second radio wave intensity that is the intensity of a radio wave received from a radio wave transmitter other than the master machine at each of a plurality of positions;
Identifying the relationship between the positions based on the radio wave measurement results at the respective positions;
Measuring method including

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