JP5119679B2 - Sensor tag cooperation system, sensor tag cooperation method, and sensor tag cooperation program - Google Patents

Description

  The present invention adjusts the data measurement method of the sensor tag according to the number of sensor tags existing in the measurement target area, thereby reducing the power consumption of the sensor tag that performs measurement and the amount of memory used. The present invention relates to a technique for measuring appropriate environmental data regarding the area.

  A conventional sensor tag can collect environmental data autonomously by measuring environmental data in a measurement target area using a built-in sensor function and storing the measured data in a built-in memory.

  Some conventional sensor tags do not have a built-in sensor function. The environmental data can be collected by measuring the environmental data by an external sensor function and storing the measured data in the memory built in the sensor tag by the sensor tag control device.

  Some conventional sensor tags do not have a built-in memory function. Measure environmental data with the built-in sensor function, receive notification of environmental data measured by the sensor tag control device, and collect environmental data in the sensor tag control device or in the environmental data storage device connected to the network be able to.

  An example of a conventional sensor tag system is described in Patent Document 1. As shown in FIG. 19, the conventional sensor tag system includes a sensor tag 2000 and a tag reader 2200. The sensor tag 2100 includes a sensor 201 and a measurement data storage unit 103. The conventional sensor tag system having such a configuration operates as follows. That is, the data measured by the sensor 201 is periodically provided to the measurement data storage unit 103. The measurement data storage unit 103 stores measurement data in time series. The tag reader 2200 can acquire measurement data from the measurement data storage unit 103 using radio. For example, in the case of a temperature sensor tag with a built-in temperature sensor, the temperature around the temperature sensor tag can be periodically measured and stored in an internal memory. From the tag reader, it is possible to obtain time-series measurement data indicating in what temperature environment the temperature sensor was stored.

  On the other hand, an example of a conventional product distribution management system is described in Patent Document 2. As shown in FIG. 20, this conventional product distribution management system includes a wireless tag 3100 and a wireless tag processing device 3200. The wireless tag 3100 includes a tag ID storage unit 101, a tag information advertisement unit 102, and a measurement data storage unit 103. The wireless tag processing device 3200 includes a sensor 201, a tag selection unit 202, and a measurement data providing unit 204.

  An example of a sensor information management device and system for a conventional sensor network is described in Patent Document 3. As shown in FIG. 21, the sensor information management apparatus and system of this conventional sensor network includes a wireless tag 4100, a sensor node 4200, and a management node 4300. The wireless tag 4100 includes a tag ID storage unit 101 and a tag information advertisement unit 102. The sensor node 4200 includes a sensor 201, a tag selection unit 202, and a measurement data providing unit 204. The management node 4300 includes measurement data storage means 103.

  The conventional product distribution management system having such a configuration and the sensor information management apparatus and system of the sensor net operate as follows. That is, the tag ID is advertised from the tag information advertising means 102 to the tag selecting means 202 (step 1 in FIG. 22). When the tag selection unit 202 determines that the environmental data related to the tag is to be measured (step 2), the measurement data providing unit 204 is requested to transmit the measurement data acquired from the sensor 201 to the measurement data storage unit 103 ( Step 3). The measurement data providing unit 204 transmits the measurement data to the measurement data storage unit 103 in response to the request (Step 4). At this time, the measurement data storage unit 103 may be inside the wireless tag or outside the wireless tag. In this way, by adopting a configuration in which a sensor outside the wireless tag can be used, restrictions on usable sensors in the conventional sensor tag system can be relaxed.

  By using a plurality of such conventional sensor tags at the same time, the environmental data of the measurement target area can be collected by each sensor tag. By synthesizing the environmental data collected in this way, for example, taking an average value, more accurate environmental data can be grasped.

In addition, there is a conventional technique for collecting environmental data of a measurement target area by using a plurality of sensor tag control devices simultaneously. As an example of such a technique, Patent Document 4 describes a conventional visitor movement prediction system in a closed space. In this conventional visitor movement prediction system, direction recognition sensors are respectively installed at intersections connecting a plurality of passages provided in the exhibition hall, and each direction recognition sensor transmits direction recognition data to a host computer. The host computer analyzes the accumulated direction recognition data, and when an IC tag enters from each passage for each intersection, the probability that the IC tag will go out to each other passage After calculating a staying probability that is a probability that an IC tag that has passed a certain moving direction and any one of the intersections does not reach other neighboring intersections within a unit time, each IC tag that exists in the exhibition hall is each The existence probability for each passage that can exist after the passage of unit time is calculated, and for each passage, the IC tag that can exist after the passage of unit time as the sum of the existence probability By calculating the number, enabling the prediction of congestion at each location in space.
JP 2004-014468 A JP 2004-292147 A JP 2005-284341 A JP 2006-106875 A

  However, even if a plurality of sensor tags can always be used, environmental data with reasonable accuracy may be sufficient. For example, even when 100 sensor tags can be used, it may be sufficient to synthesize environmental data obtained from five sensor tags. In such a case, conventionally, it has been a problem that a human being has to manually set which sensor tag measures environmental data, which is troublesome. In addition, manual setting induces setting mistakes, and as a result, extra sensor tags are used, environmental data that is wasted when the sensor tag is synthesized, wastes power for operation, There was a problem that the amount of memory for saving environmental data was wasted.

  The present invention has been made to solve the above-described problems. The purpose is to collect environmental data with reasonable accuracy reliably and with less effort compared to the case of manually starting sensor tag data measurement.

The present invention is a sensor tag cooperation system for collecting measurement data using a plurality of sensor tags,
Provided is a sensor tag cooperation system that changes the number of sensor tags that measure data according to the number of sensor tags present in a measurement target area.

The present invention is a sensor tag cooperation system that collects measurement data using a plurality of sensor tags,
A sensor tag cooperation system that applies a measurement pattern according to the number of sensor tags that are measuring data is provided.

Further, the present invention is a sensor tag cooperation method for collecting measurement data using a plurality of sensor tags,
Provided is a sensor tag cooperation method for changing the number of sensor tags that measure data according to the number of sensor tags existing in a measurement target area.

Further, the present invention is a sensor tag cooperation method for collecting measurement data using a plurality of sensor tags,
Provided is a sensor tag cooperation method that applies a measurement pattern according to the number of sensor tags measuring data.

  According to the present invention, environmental data with reasonable accuracy can be reliably collected with less labor compared to the case of manually starting sensor tag data measurement.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram for explaining the concept of the first embodiment of the present invention.

  Referring to FIG. 2, the sensor tag cooperative system according to the first embodiment of the present invention includes a sensor tag control unit 1, an area entry / exit determination unit 1, an area entry / exit rule management unit 1, a sensor control determination unit 1, and a sensor. The control rule management unit 1 and the measurement state management unit 1 are configured.

These functions generally operate as follows.
The sensor tag control unit 1 detects and controls a sensor tag by operating a sensor tag control device (not shown). When the sensor tag control device detects the appearance of the sensor tag, the area tag management unit 1 is notified of the detected sensor tag control device ID, the detection type, and the detected sensor tag ID. Here, the detection type is “appearance”. When the disappearance of the sensor tag is detected, the detection type is “disappearance”. Moreover, according to the request | requirement from the sensor control determination part 1, the sensor tag data measurement start / stop and environmental data collection from the sensor tag are performed via the sensor tag control device.

  The area entry / exit determination unit 1 notifies the sensor control determination unit 1 of the entry or exit of the sensor tag with respect to the target area. When the appearance or disappearance of the sensor tag is notified from the sensor tag control unit 1 together with the sensor tag control device ID and the sensor tag ID, the area tag entry / exit rule management unit 1 is referred to, and the sensor tag is identified from the notified ID. The entrance / exit is determined, and the determination result is notified to the sensor control determination unit 1.

  The area entry / exit rule management unit 1 manages the detection type and the entry / exit determination content for each sensor tag control device ID. FIG. 3 shows area entry / exit rules relating to the gate type reader / writer 1 and 2 as the sensor tag control device. When the gate-type reader / writer 1 detects the appearance of a sensor tag, the detected sensor tag is determined to be entering. When the gate-type reader / writer 2 detects the appearance of a sensor tag, the detected sensor tag is determined to be leaving.

  FIG. 4 shows an area entry / exit rule concerning the smart shelf type reader / writer 1 as the sensor tag control device. When the smart shelf type reader / writer 1 detects the appearance of a sensor tag, it is determined that the detected sensor tag is entrance. On the other hand, when the disappearance of the sensor tag is detected by the smart shelf type reader / writer 1, it is determined that the detected sensor tag is an exit.

  When the entry / exit of the sensor tag is notified from the area entry / exit decision unit 1, the sensor control determination unit 1 determines the control for the sensor tag that has entered / exited or the sensor tag existing in the area. When a sensor tag enters, the number of sensor tags in the area managed by the sensor control determination unit 1 is increased, the sensor control rule management unit 1 is referred to, and if the upper limit of the number of sensor tags in the area is not exceeded, the sensor tag control unit 1 is instructed to start data measurement of the sensor tag that has entered, and the measurement state management unit 1 is updated. If the upper limit is exceeded, only the measurement state management unit 1 is updated. When the sensor tag exits, the number of sensor tags in the area is reduced, the sensor control determination unit 1 is instructed to stop data measurement of the sensor tag that has exited, and the measurement state management unit 1 is updated.

  The sensor control rule management unit 1 manages the upper limit of sensor tags used for data measurement in an area targeted by the system of the invention. FIG. 5 illustrates that the upper limit in the target area is 2. In addition, the environmental data measurement cycle of each sensor tag is managed together. FIG. 5 illustrates that the period is 20 seconds.

  Next, the operation of the first exemplary embodiment of the present invention will be described in detail with reference to the sequence diagram of FIG.

  First, the sensor tag control unit 1 operates the gate type reader / writer 1 which is a sensor tag control device, detects the appearance of the sensor tag 1, and detects the ID of the sensor tag control device, the detection type, and the detected sensor tag. The ID is notified to the area entrance / exit management unit 1 (FIG. 6 (1)).

  Next, when the area entry / exit determination unit 1 is notified of the appearance of the sensor tag from the sensor tag control unit 1, the area entry / exit rule management unit 1 is referred to and an entry / exit rule related to the sensor tag control device is acquired ( FIG. 6 (2)).

  Furthermore, the area entry / exit determination unit 1 notifies the sensor control determination unit 1 that the sensor tag 1 has entered based on the acquired rule (FIG. 6 (3)).

  When the sensor control determination unit 1 is notified of the entrance of the sensor tag 1 from the area entry / exit determination unit 1, the number of sensor tags in the area managed by the sensor control determination unit 1 is increased from 0 to 1 (FIG. 6 (4)). ).

  Next, the sensor control determination unit 1 acquires the upper limit 2 from the sensor control rule management unit 1 (FIG. 6 (5)).

  The sensor control determination unit 1 determines whether the number of sensor tags in the area = 1 exceeds the upper limit = 2 (FIG. 6 (6)), and requests the sensor control unit 1 to start data measurement of the sensor tag that has entered. (FIG. 6 (7)).

  Now, when the sensor tags 1, 2, and 3 are sequentially detected by the gate-type reader / writer 1, since the upper limit is 2, the measurement of the sensor tag 3 is not performed. Therefore, data measurement as shown in FIG. 7 is performed in each sensor tag. That is, the sensor tags 1 and 2 are ON, but the sensor tag 3 remains OFF. Now, the data value measured by the sensor tag i at time t is expressed as Si (t). If the combined data value at time t is C (t), it can be expressed as C (t) = (S1 (t) + S2 (t)) / 2.

Next, effects of the first exemplary embodiment of the present invention will be described.
In the first embodiment of the present invention, the appearance / disappearance of the sensor tag automatically detected by the sensor tag control unit is automatically converted into entry / exit to the area by the area entry / exit determination unit, and sensor control is performed. Since it is configured to notify the determination unit, the sensor control determination unit can automatically grasp the number of sensor tags performing data measurement in the data measurement target area. In the first embodiment of the present invention, the sensor control determination unit can automatically request data measurement of the sensor tag until the specified upper limit is reached. In this embodiment, the entry / exit of the sensor tag is automatically detected using the sensor tag control device, but may be detected using another storage / exit management system.

  Next, a second embodiment of the present invention will be described. This embodiment is dependent on the first embodiment, and the sensor tag control device can realize the start of data measurement not only when the sensor tag enters but also after the sensor tag enters the area. Applicable to the case.

  The configuration of this embodiment is shown in FIG. Compared to the first embodiment, a measurement state management unit 1 is added.

  The measurement state management unit 1 manages the data measurement state of each sensor tag existing in the area. FIG. 9 illustrates that the sensor tags 1, 2, and 3 in the area are measuring (ON), measuring (ON), and not measuring (OFF), respectively.

  The sensor control determination unit 1 updates the measurement state management unit 1 after requesting the sensor tag control unit 1 to start or stop data measurement of the sensor tag.

  The operation of the second exemplary embodiment of the present invention will be described in detail with reference to the sequence diagram of FIG. The sensor tags 1, 2, and 3 are sequentially detected by the gate type reader / writer 1, and since the upper limit is 2, the description starts from the situation where the data measurement of the sensor tag 3 has not started.

  First, the sensor tag control unit 1 operates the gate type reader / writer 1 which is a sensor tag control device, detects the disappearance of the sensor tag 1, and detects the ID of the sensor tag control device, the detection type, and the detected sensor tag. The ID is notified to the area entrance / exit management unit 1 (FIG. 10 (1)).

  Next, when the area entry / exit determination unit 1 is notified of the exit of the sensor tag from the sensor tag control unit 1, the area entry / exit rule management unit 1 is referred to obtain an entry / exit rule related to the sensor tag control device ( FIG. 10 (2)).

  Furthermore, the area entry / exit determination unit 1 notifies the sensor control determination unit 1 that the sensor tag 1 has exited based on the acquired rule (FIG. 10 (3)).

  When the sensor control determination unit 1 is notified of the exit of the sensor tag 1 from the area entry / exit determination unit 1, the number of sensor tags in the area managed by the sensor control determination unit 1 is reduced from 2 to 1 (FIG. 10 (4)). ).

  Next, the sensor control determination unit 1 acquires the upper limit 2 from the sensor control rule management unit 1 (FIG. 10 (5)).

  The sensor control determination unit 1 determines whether the number of sensor tags in the area = 1 does not exceed the upper limit = 2 (FIG. 10 (6)). If the upper limit is not exceeded, data measurement is performed from the measurement state management unit. The sensor tag which is not performed is acquired (FIG. 10 (7)).

  The sensor control determination unit 1 determines whether there is a sensor tag that has not been subjected to data measurement (FIG. 10 (8)), and if present, requests data measurement from a sensor tag that is not performing data measurement. (FIG. 10 (9)).

  Furthermore, the sensor control unit 1 updates the measurement state management unit 1 (FIG. 10 (10)).

  In the measurement state management unit 1, as shown in FIG. 11, when the sensor tag 1 leaves, the sensor tag 3 is turned on (data measurement).

  In the first embodiment, when the sensor tag 1 leaves, only the sensor tag 2 continues to measure data. On the other hand, in the second embodiment, data measurement can be continued with the number of sensor tags close to the specified upper limit as much as possible. This can prevent a reduction in accuracy of measurement data.

  Next, a third embodiment of the present invention will be described. This embodiment is dependent on the first or second embodiment, and the sensor tag control device performs data measurement not only when the sensor tag enters but also after the sensor tag enters the area. This can be applied to the case where the start of the sensor tag can be realized and the failure of the sensor tag can be detected. The breakdown of battery consumption is also included.

  The configuration is the same as in the first and second embodiments, but in the second embodiment, the same operation as that for the sensor tag in the area where the data measurement has not started is performed when the sensor tag leaves. Is performed when a sensor tag failure is detected. For example, sensor tags 1, 2, and 3 are detected in turn by the gate-type reader / writer 1, and the upper limit is 2, so that the sensor tag 1 fails in the situation where data measurement of the sensor tag 3 has not started. However, data measurement can be continued with the sensor tags 2 and 3. This can prevent a reduction in accuracy of measurement data.

  Next, a fourth embodiment of the present invention will be described. In the first embodiment, the sensor tag that performs data measurement is selected so as not to exceed the upper limit. In the present embodiment, all the sensor tags that enter the site perform data measurement, but each data measurement pattern is changed.

  The configuration of the fourth embodiment of the present invention is the same as the configuration of the second embodiment shown in FIG.

  The sensor control rule management unit 1 manages a pattern number, a data measurement start time, and a data measurement cycle as a data measurement pattern for each number of sensor tags in the area (FIG. 12). Note that the data measurement start time and / or data measurement cycle can be used for the measurement pattern.

  The operation of the fourth exemplary embodiment of the present invention will be described in detail with reference to the sequence diagram of FIG.

  Since (1) to (3) in FIG. 13 are the same as (1) to (4) in the sequence diagram 6 of the first embodiment, description thereof will be omitted. When the sensor control determination unit 1 increases the number of sensor tags in the area from 0 to 1 (FIG. 13 (4)), the sensor control determination unit 1 determines from the sensor control rule management unit 1 that the number of sensor tags is 1. -1 is acquired (FIG. 13 (5)). Pattern 1-1 has a start time of 0 and a period of 10 seconds. The sensor control determination unit 1 requests the sensor tag control unit 1 to perform data measurement according to the acquired pattern (FIG. 13 (6)).

  For example, sensor tags 1, 2, and 3 are sequentially detected by the gate-type reader / writer 1, and data measurement is performed by applying pattern 1-1, pattern 2-2, and pattern 3-3 to each sensor tag. In this case, data can be collected and synthesized by each sensor tag as shown in FIG. The synthesized values are C (0) = S1 (0), C (10) = [S1 (10) + S2 (10)] / 2, C (20) = [S1 (20) + S2 (20 ) + S3 (20)] / 3,... The sensor tags 2 and 3 have a longer measurement cycle than that of 1.

  In the present embodiment, by preparing a measurement pattern corresponding to the number of sensor tags in the area in advance, data measurement can be performed while adjusting the data measurement start time and / or the data measurement cycle. If the data measurement start time is adjusted, the overlap of the data measurement times can be shifted. By adjusting the data measurement cycle, it is possible to reduce the amount of memory consumed for storing measurement data and the power consumption of the measurement operation and data notification operation.

  Next, a fifth embodiment of the present invention will be described. In the fourth embodiment, an appropriate amount of data can be collected by determining the upper limit of the number of sensor tags.

  Therefore, an upper limit of the number of sensor tags is added to the sensor control rule management unit 1. When the sensor tag is entered, the number of sensor tags in the area is updated. When the number of sensor tags does not exceed the upper limit, the measurement pattern is searched and data measurement for the entrance sensor tag is requested. If the number of sensor tags exceeds the upper limit, only the measurement state management unit is updated.

  Alternatively, in the fourth embodiment, the sensor control rule management unit manages only the upper limit sensor tag number pattern. When searching for a measurement pattern, if there is no measurement pattern related to the number of corresponding sensor tags, the sensor control determination unit 1 does not request the start of sensor tag data measurement and only updates the measurement state management unit.

  Next, a sixth embodiment of the present invention will be described. In the present embodiment, the sensor tag control device can realize the start of data measurement (correctly resetting the measurement pattern) not only when the sensor tag enters but also after the sensor tag enters the area. Applicable to the case. It can also be applied to detecting a sensor tag failure.

  In the fourth or fifth embodiment, the measurement pattern applied to each sensor tag deviates from the current number of sensor tags in the area. Therefore, in the sixth embodiment, when the number of sensor tags is increased or decreased, the measurement pattern shift is corrected by changing the measurement pattern of the sensor tag already existing in the area.

  The configuration of this embodiment is the same as that of the third embodiment shown in FIG.

  The measurement state management unit manages the sensor tag ID that performs data measurement and the measurement pattern number of the sensor tag ID. FIG. 15 illustrates a state where the sensor tag 2 enters the place where the sensor tag 1 is operating in the measurement pattern 1-1 and changes the measurement pattern of the sensor tag 1 to 2-1. By doing so, it is possible to synthesize measurement data as shown in FIG.

  Since more appropriate adjustment of data measurement is performed, more useful data can be collected with less resources (memory amount, power consumption).

  Next, a seventh embodiment of the present invention will be described with reference to FIG. A single system can handle multiple areas. All sensor tag control units are connected to the area entry / exit determination unit. The “area ID” is entered in each of the entry / exit rule management unit, the sensor control rule management unit, and the measurement state management unit.

  Next, an eighth embodiment of the present invention will be described with reference to FIG. This is a technique different from the seventh embodiment that enables a single system to handle a plurality of areas.

  In this method, a sensor tag control unit and an area entry / exit determination unit are provided for each area, and the sensor control determination unit is placed in the center.

  The above-described embodiment is a preferred embodiment of the present invention, and various modifications can be made without departing from the gist of the present invention. For example, a process for realizing the function of each device is performed by causing each device to read and execute a program for realizing the functions of the product management server 20, the wireless communication device 40, the anti-theft server 70, the payment device 100, and the like. May be. Further, the program is transmitted to another computer system by a transmission wave via a computer-readable recording medium such as a CD-ROM or a magneto-optical disk, or via a transmission medium such as the Internet or a telephone line. Also good.

  INDUSTRIAL APPLICABILITY According to the present invention, it can be applied to uses such as a physical distribution system that monitors the status of goods being transported using a temperature sensor, a humidity sensor, a carbon dioxide gas sensor, an impact sensor, and the like. The product may be a fresh product, a medicine, a work of art, or the like. It can also be applied to uses such as asset management, facility management, and production management.

It is a figure explaining the concept of the 1st Embodiment of this invention. It is a block diagram which shows the system configuration | structure of the 1st Embodiment of this invention. It is a figure which shows the area entrance / exit rule of the 1st Embodiment of this invention. It is a figure which shows the area entrance / exit rule of the 1st Embodiment of this invention. It is a figure which shows the processing operation of the 1st Embodiment of this invention. It is a sequence diagram of the 1st Embodiment of this invention. It is a figure explaining the data measurement of the 1st Embodiment of this invention. It is a block diagram which shows the system configuration | structure of the 2nd Embodiment of this invention. It is a figure which shows the mode of the sensor tag in the area of the 2nd Embodiment of this invention. It is a sequence diagram of the 2nd Embodiment of this invention. It is a figure which shows the measurement state management part of the 2nd Embodiment of this invention. It is a figure which shows the sensor control rule management part of the 4th Embodiment of this invention. It is a sequence diagram of the 4th Embodiment of this invention. It is a figure explaining the data composition of the 4th Embodiment of this invention. It is a figure which shows the measurement state management part of the 6th Embodiment of this invention. It is a figure explaining the data composition of the 6th Embodiment of this invention. It is a block diagram which shows the system configuration | structure of the 7th Embodiment of this invention. It is a block diagram which shows the system configuration | structure of the 8th Embodiment of this invention. It is a figure which shows an example of a prior art. It is a figure which shows an example of a prior art. It is a figure which shows an example of a prior art. It is a figure which shows an example of a prior art.

Claims (12)

A sensor tag cooperation system that collects measurement data in one or more predetermined areas using a plurality of sensor tags,
A sensor tag control unit that detects entry and exit of a sensor tag into an area and instructs the sensor tag to start or stop data measurement;
A measurement state management unit that updates the number of sensor tags that are measuring data present in the area;
A sensor control rule management unit that stores the upper limit value of the sensor tag that performs data measurement;
The sensor tag control unit instructs the sensor tag that has entered the area to start data measurement when the number of sensor tags in the area does not exceed the upper limit value, and exceeds the upper limit value. A sensor tag cooperation system that does not instruct the sensor tag that has entered beyond the upper limit to start data measurement .   2. When the sensor tag control unit detects the appearance of a sensor tag from the area, the measurement state management unit updates the number of sensor tags existing in the area and measuring data. Sensor tag cooperation system described in 1. The sensor tag control unit detects whether the sensor tag in the area is measuring data, and the measurement state management unit determines the number of sensor tags that are in the area and are measuring data. The sensor tag cooperation system according to claim 1, wherein the sensor tag cooperation system is updated. When the sensor tag control unit detects that a sensor tag in the area has failed, the measurement state management unit updates the number of sensor tags existing in the area and measuring data. Item 4. The sensor tag cooperation system according to any one of Items 1 to 3. A sensor tag cooperation method for collecting measurement data in one or more predetermined areas using a plurality of sensor tags,
Detects entry and exit of a sensor tag in the area, instructs the sensor tag to start or stop data measurement,
Update the number of sensor tags that are in the area and are measuring data,
The upper limit value of the sensor tag that performs data measurement is stored, and when the number of sensor tags in the area does not exceed the upper limit value, the sensor tag that has entered the area is instructed to start data measurement , and the upper limit value A sensor tag cooperation method that does not instruct the sensor tag that has entered beyond the upper limit value to start data measurement when the value exceeds the upper limit . The sensor tag cooperation method according to claim 5, wherein, when the appearance of a sensor tag from the area is detected, the number of sensor tags existing in the area and measuring data is updated. The detection of whether or not the sensor tag in the area measures data, and updates the number of sensor tags that measure the data existing in the area. The described sensor tag cooperation method. The sensor tag according to any one of claims 5 to 7, wherein the sensor tag in the area is detected to be broken, and the number of sensor tags existing in the area and measuring data is updated. Cooperation method. A sensor tag cooperation program that collects measurement data in one or more predetermined areas using a plurality of sensor tags,
Sensor control rule management processing for storing the upper limit value of the sensor tag that performs data measurement,
A measurement state management process for updating the number of sensor tags measuring data present in the area;
Detecting entry / exit of a sensor tag in the area, and instructing the sensor tag entering the area to start data measurement when the number of sensor tags in the area does not exceed the upper limit, the upper limit A sensor tag cooperation program that causes a computer to execute a sensor tag control process that does not instruct the sensor tag that has entered beyond the upper limit value to start data measurement when the value exceeds the upper limit . 10. The sensor according to claim 9, wherein when the appearance of a sensor tag from the area is detected, the computer executes the measurement state management process for updating the number of sensor tags that are present in the area and measuring data. Tag collaboration program. The sensor tag control process for detecting whether or not the sensor tag in the area is measuring data, and the measurement state management process for updating the number of sensor tags existing in the area and measuring data. The sensor tag cooperation program according to any one of claims 9 and 10, which is executed by the computer. The sensor tag control process for detecting that a sensor tag in the area has failed;
The sensor tag cooperation program according to any one of claims 9 to 11, which causes the computer to execute the measurement state management process for updating the number of sensor tags that are present in the area and measuring data.

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