WO2012124128A1

WO2012124128A1 - Information processing device, sensor system, program and recording medium

Info

Publication number: WO2012124128A1
Application number: PCT/JP2011/056632
Authority: WO
Inventors: 早映子柴垣; 壮司大前; 公啓生雲; 亮太赤井; 勇樹上山
Original assignee: オムロン株式会社
Priority date: 2011-03-15
Filing date: 2011-03-18
Publication date: 2012-09-20
Also published as: JP2012195705A; JP4835802B1

Abstract

A transmission timing setting unit (205) of a server device (200) of the present invention, on the basis of the number of connected sensor modules (100), partitions the amount of time of a transmission time interval into a plurality of uniform assigned amounts of time in order to set the transmission timing for each of the connected plurality of sensor modules (100) so that data transmission for one sensor module (100) is performed within the assigned time.

Description

Information processing apparatus, sensor system, program, and recording medium

The present invention relates to an information processing apparatus that communicates with a plurality of sensor modules and receives data measured by each sensor module, and relates to an information processing apparatus that sets data transmission timing for each of the plurality of sensor modules.

A sensor network technology is known in which a plurality of sensor modules and a server device (information processing device) are connected via a network, and the server device receives a plurality of data from each of the plurality of sensor modules and collects the data.

One of the requirements for such a sensor network configuration is to extend the battery life of the sensor module. As a method for extending the service life, the timing of energizing the communication unit in each sensor module is set at a fixed time interval, and the stored measurement data is collected by communicating with the server device at the timing of energizing the communication unit. There is a way to send.

However, in this method, since each sensor module transmits and receives data with the server at the transmission timing set individually, there is a problem in that collision between data communicated between the plurality of sensors and the server occurs. The collision between data is more likely to occur as the number of connected sensor modules increases.

If the data collide, the server device may not be able to receive some or all of the collided data. If data reception fails, the server device does not transmit a message indicating reception completion to the sensor module that is the data transmission source. The sensor module of the data transmission source detects that the communication has failed because it cannot receive the message from the server device, and retransmits the same data. The data retransmission is repeated until the communication is successful or the number of retransmissions reaches a predetermined number.

Such re-transmission of data may cause a delay in the collection of measurement data of the server device or cause the collection of necessary measurement data to be disabled.

Also, re-transmission of data may cause a decrease in the battery life of the sensor module. This is because the communication unit of the sensor module needs to be energized again in order to retransmit the data. That is, the retransmission due to the collision of data goes against the requirement for extending the battery life of the sensor module required for the sensor network configuration.

Conventionally, as a technique for avoiding collision between data, for example, there are

Patent Documents

1 and 2.

Patent Document 1 describes a technique in which a plurality of sensor nodes and a gateway device are connected via a network, and the gateway device allocates timing for acquiring sensing data to each of the plurality of sensor nodes. ing.

The gateway device assigns a timing corresponding to a sensing cycle for transmitting sensing data to each of a plurality of sensor nodes having different sensing cycles. Here, the gateway apparatus preferentially determines the timing with respect to the sensor node having a short sensing cycle. Further, when there are sensor nodes having the same timing as a result of assigning the timing, the timing of acquiring sensing data is adjusted by increasing or decreasing the timing of the sensor node having a long sensing cycle. This prevents the timing from overlapping.

Patent Document 2 describes a technique for preventing data acquisition timing from overlapping in a mobile communication system including a base station and a plurality of mobile stations. In this mobile communication system, a base station determines priority for each packet data, assigns a channel to each of a plurality of mobile stations, and receives packet data transmitted by each of the plurality of mobile stations based on the assigned channel. Here, the priority is determined by, for example, the communication quality of the transmission path, and the base station assigns a longer channel earlier to a packet with a higher priority.

Japanese Patent Publication “Japanese Patent Laid-Open No. 2010-220036 (published on September 30, 2010)” Japanese Patent Publication “Japanese Patent Laid-Open No. 2000-224231” (published on August 11, 2000)

By the way, in a sanse network, a system may be configured such that each of a plurality of sensor modules connected to the server device via the network transmits data to the server device at the same transmission time interval. That is, in each sensor module, the timing for energizing the communication unit is set to the same time interval.

The mutual relationship between the transmission timings of the sensor modules having the same transmission time interval is determined by the time when the power switch of each sensor module is turned on. This is because the timer is operated from the power switch time and data is transmitted every time the transmission time interval elapses. When the transmission time interval is, for example, 60 seconds, the transmission timing of the sensor module B in which the power switch is turned on 60 seconds after the power switch of the sensor module A is turned on also overlaps.

FIG. 22 shows that the server apparatus has received data from six sensor modules SM-1 to SM-6, each of which is set to a transmission time interval of 60 seconds when the power switch is turned on at random. The reception timing is shown. In FIG. 22, the time point when the server apparatus starts receiving data transmitted from the sensor module SM-3 is used as a base point.

In the example of FIG. 22, the data transmitted by the sensor module SM-2 collides with the data transmitted by the sensor module SM-6. Further, the data transmitted by the sensor module SM-5 and the data transmitted by the sensor module SM-1 also collide.

As can be seen from the timing of the next 60 seconds (next transmission cycle), since the sensor module SM-1 to SM-6 have the same transmission time interval, the transmission timing is also maintained for the next transmission cycle. In other words, the collided data always remain collided.

Therefore, it is conceivable to avoid such collision between data using the techniques of

Patent Documents

1 and 2.

However, the technique described in Patent Document 1 is based on the premise that data is transmitted with the same transmission time interval as the sensing period, and the transmission timing is adjusted by paying attention to the difference in the sensing period. Therefore, regardless of the sensing cycle, it is not appropriate as an adjustment method when the transmission timing overlaps at the timing when the power switch of the sensor module is turned on.

Also, with the technology described in Patent Document 2, the mobile station must always wait for a message in order to obtain permission for transmission from the base station. Therefore, when this technique is applied to a sensor network, the timing for energizing the wireless unit in each sensor module is set at a fixed interval, and data is transmitted to and received from the server device only at the timing for energizing the wireless unit. This is incompatible with attempts to reduce power consumption, and there is a problem that the battery life of the sensor module cannot be extended.

The present invention has been made in view of the above problems, and its purpose is based on the premise that each of the plurality of sensor modules transmits data to the server device at the same transmission time interval. It is to provide an information processing apparatus, a sensor system, a program, and a recording medium that can adjust the data transmission timing and suppress the occurrence of collision between data.

In order to solve the above problems, an information processing apparatus of the present invention is connected to a plurality of sensor modules that transmit data obtained by measurement to the outside via a network, and communicates with the plurality of sensor modules to obtain data. An information processing apparatus for collecting, wherein each of the plurality of sensor modules has an equal transmission time interval for transmitting data, and receives data when communicating with the plurality of sensor modules. Reception time storage means for storing the time and identification information of the sensor module that transmitted the data in the storage unit at least for the time of the transmission time interval, and the reception read from the storage unit for each of the plurality of sensor modules A transmission timing for setting a transmission timing for transmitting data based on the time and identification information and the transmission time interval. The transmission timing setting means divides the time of the transmission time interval into a plurality of equally allocated times based on the number of the plurality of sensor modules, and one sensor module within the allocated time. A transmission timing is set for each of the plurality of sensor modules so that data transmission is performed.

According to the above configuration, when the reception time storage means communicates with a plurality of sensor modules, the reception time when the data is received and the identification information of the sensor module that transmits the data correspond to at least the transmission time interval. The amount of time to be stored is stored in the storage unit. By acquiring information for at least the transmission time interval, all sensor modules connected to the server device can be recognized.

The transmission timing means sets a transmission timing for transmitting data based on the reception time and identification information read from the storage unit and the transmission time interval for each of the plurality of sensor modules.

Specifically, the transmission timing setting means divides the time of the transmission time interval into a plurality of equally allocated times based on the number of the plurality of sensor modules, and transmits data of one sensor module within the allocated time. The transmission timing is set for each of the plurality of sensor modules.

This makes it possible to evenly distribute the data transmission timing of each sensor module within the transmission time interval, and to suppress the occurrence of collision between the data. Therefore, it is possible to reduce the power consumption of the sensor module due to the re-transmission of the measurement data and contribute to the extension of the battery life. In addition, it is possible to reliably reduce measurement data collection delay and collection omission in the server device due to retransmission of measurement data.

According to the present invention, in a configuration in which each of a plurality of sensor modules transmits data to the server device at the same transmission time interval, the data transmission timing of each sensor module is evenly distributed within the transmission time interval. The occurrence of a collision can be suppressed. Therefore, it is possible to reduce the power consumption of the sensor module due to the re-transmission of the measurement data and contribute to the extension of the battery life. In addition, it is possible to reliably reduce measurement data collection delay and collection omission in the server device due to retransmission of measurement data.

It is a block diagram which shows an example of a structure of the sensor module and server apparatus which concern on Embodiment 1 of this invention. It is a figure which shows an example of the whole outline | summary of the data processing system in Embodiment 1 of this invention. It is explanatory drawing which shows the image implemented in the server apparatus which concerns on Embodiment 1 of this invention, and optimizes a transmission timing. It is a figure which shows an example of the reception time management DB which the server apparatus which concerns on Embodiment 1 of this invention builds. It is a figure which shows an example of the sensor reception time management table which the server apparatus which concerns on Embodiment 1 produces. It is a figure which shows an example of the sensor ID table which the server apparatus which concerns on Embodiment 1 produces. It is a figure which shows an example of the sensor reception time data which the server apparatus which concerns on Embodiment 1 accumulate | stores in reception time management DB. It is a figure which shows an example of the management setting table which the server apparatus which concerns on Embodiment 1 produces. 4 is a flowchart illustrating a flow of basic processing in the sensor module according to the first embodiment. 3 is a flowchart illustrating a flow of measurement processing in the sensor module according to the first embodiment. 4 is a flowchart illustrating a flow of each data transmission / message reception process of the server device and the sensor module according to the first embodiment. 6 is a flowchart illustrating a flow of a transmission offset value calculation process in the server device according to the first embodiment. 6 is a flowchart illustrating a flow of transmission offset correction processing in the server device according to the first embodiment. 6 is a flowchart illustrating a flow of a transmission offset reservation process to a setting management table in the server device according to the first embodiment. Both (a) and (b) explain the results of measuring and comparing the number of missing data, the number of retransmissions, and power consumption before and after optimization of transmission timing by the server device according to the first embodiment. It is a drawing. It is explanatory drawing which shows the image implemented in the server apparatus which concerns on Embodiment 2 of this invention, and optimizes a transmission timing. It is a block diagram which shows an example of a structure of the sensor module and server apparatus which concern on Embodiment 2 of this invention. It is a block diagram which shows an example of a structure of the sensor module and server apparatus of the modification concerning Embodiment 2 of this invention. It is a block diagram which shows an example of a structure of the sensor module and server apparatus which concern on Embodiment 3 of this invention. 14 is a flowchart illustrating a flow of a transmission offset value calculation process in the server device according to the third embodiment. 14 is a flowchart illustrating a flow of transmission time interval change processing in the server device according to the third embodiment. It is drawing explaining the state which the measurement data transmitted from the several sensor module by which the transmission time interval was set to the same is transmitted at each timing, and is colliding at the time of reception in a server apparatus.

[Embodiment 1]
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram illustrating an example of the overall outline of the data processing system according to the first embodiment of the present invention.

As shown in FIG. 2, the data processing system (sensor system) 1 includes a server apparatus 200 as an information processing apparatus and a plurality of sensor modules 100. The server device 200 is connected to each of the plurality of sensor modules 100 via a network, and the server device 200 and the plurality of sensor modules 100 constitute a sensor network.

The communication between the server apparatus 200 and the plurality of sensor modules 100 via a network may use a wireless line or a wired line. Here, a case where a wireless line is used will be described as an example.

Each of the plurality of sensor modules 100 is also referred to as a sensor node, which is a small device having a sensor function for measuring a measurement target, a function for storing and processing measured data, a wireless function, a power supply function, and the like. The

Examples of the sensor that realizes the sensor function include physical sensors such as a temperature sensor, a humidity sensor, an illuminance sensor, a flow sensor, a pressure sensor, a ground temperature sensor, and a particle sensor, a CO ₂ sensor, a pH sensor, an EC sensor, and soil. There are chemical sensors such as moisture sensors.

Each of the plurality of sensor modules 100 measures and stores data at a set measurement time interval, and transmits the measured data (hereinafter referred to as measurement data) to the server device 200 collectively at a set transmission time interval. To do.

In a configuration in which a plurality of sensor modules are connected to the server device, the timing at which the measurement data is transmitted to the server device between different sensor modules overlaps, and there is a possibility that measurement data may collide. When the number of connected sensor modules is large, or when the transmission time interval of each sensor module is short, a collision is more likely to occur.

As described above, when a measurement data collision occurs, the sensor module retransmits the measurement data. Such retransmission may cause a delay in the measurement data collection of the server device, It may cause the collection to become impossible.

Also, re-transmission of measurement data causes a decrease in battery life of the sensor module. In particular, in a system configuration in which the transmission time interval is unified in each of the plurality of sensor modules and all the sensor modules are set to transmit data to the server device at the same transmission time interval, transmission between the sensor modules is performed. The interrelationship of timing is determined by the time when the power switch of each sensor module is turned on. For this reason, the transmission timing is maintained regardless of the transmission cycle, so that the collided data always remain in collision. Therefore, it is necessary to adjust so that the transmission timing does not overlap.

Therefore, in the present embodiment, the server device 200 transmits at least the reception time when data is received and the sensor ID (identification information) of the sensor module that transmitted the data when communicating with the plurality of sensor modules 100. A time corresponding to the time interval is acquired, and for each of the plurality of sensor modules 100, a transmission timing for transmitting measurement data is set based on the acquired reception time, sensor ID, and transmission time interval. .

Specifically, based on the number of the plurality of sensor modules 100, the time of the transmission time interval is divided into a plurality of equal allocation times, and data transmission of one sensor module 100 is performed within the allocation time. The transmission timing is set for each of the plurality of sensor modules 100. In other words, based on the number of the plurality of sensor modules 100, the time of the transmission time interval is divided into a plurality of equal shift times (same as the allocated time), and each of the plurality of sensor modules 100 is equal to the shift time. The transmission timing is set for each of the plurality of sensor modules 100 so that data transmission is performed in order while shifting by a certain amount. Hereinafter, processing for setting (adjusting) transmission timing in this way is expressed as optimization of transmission timing.

In FIG. 3, the server apparatus 200 optimizes the transmission timing for the six sensor modules SM-1 to SM-6 set at a transmission time interval of 60 seconds when the power switch is randomly turned on. Show the image. FIG. 3 shows the timing of data reception for four transmission periods, with the point of starting reception of data transmitted from the sensor module SM-3 as the base point of one transmission period (one transmission time interval).

As shown in FIG. 3, the server device 200 acquires data from each sensor module and simultaneously acquires and stores the sensor ID and the reception time for 60 seconds in the first round. From the acquired number of sensor IDs, the number of sensor modules connected to the server device 200 is known.

The server apparatus 200 notifies the transmission timing set for each sensor module immediately after receiving the data from the sensor modules SM-1 to SM-6 in the second round for 60 seconds.

Here, the server device 200 divides the transmission time interval of 60 seconds by the number of sensor modules (6), and calculates an allocation time to be allocated to one sensor module. Based on the allocated time and each reception time information, the transmission timings of the sensor modules SM-1 to SM-6 are set so that data transmission of one sensor module is performed within the allocated time. Each of the set transmission timings is notified to each of the sensor modules SM-1 to SM-6.

Here, the sensor modules SM-1 to SM-6 are configured to operate the timer from the time when each power switch is turned on and transmit the measurement data every time the transmission time interval elapses. . Therefore, the server device sets a transmission offset value (offset value) that is a waiting time until the next measurement data is transmitted for each of the plurality of sensor modules, thereby transmitting each of the plurality of sensor modules. Set the timing. Each of the sensor modules SM-1 to SM-6 is notified of this transmission offset value.

In the example of FIG. 3, the transmission offset value “45” is notified to the sensor module SM-2 so as to be delayed by 45 seconds. The sensor module SM-6 is notified of the transmission offset value “50” so as to be delayed by 50 seconds. The sensor module SM-5 is notified of the transmission offset value “55” so as to be delayed by 55 seconds. The sensor module SM-4 is notified of the transmission offset value “5” so as to be delayed by 5 seconds.

In 60 seconds of the third lap, the sensor module SM-3, SM-1, for which the transmission offset value has not been notified, and the sensor module SM-4 instructed to delay only 5 seconds, transmit measurement data. Sensor modules SM-2, SM-6, and SM-5 for which delays of 45 seconds, 50 seconds, and 55 seconds are instructed do not transmit measurement data.

In the fourth lap, each of the sensor modules SM-1 to SM-6 transmits data at the optimized transmission timing. The sensor module SM-2 for which a delay of 45 seconds is instructed is delayed 105 seconds after the transmission timing before the optimization for the second round of optimization (60 seconds for the third round and 45 seconds for the delay instruction). Then, the next measurement data is transmitted. The sensor module SM-4 for which a delay of 5 seconds has been instructed is delayed 65 seconds after the transmission timing before optimization for the second round of optimization (total of 60 seconds for the third round and 5 seconds for the delay instruction). Then, the next measurement data is transmitted. Although the fifth round is not shown, the sensor modules SM-1 to SM-6 transmit measurement data at intervals of 60 seconds at the same timing as the fourth round.

Thus, by uniformly distributing the transmission timing of the measurement data of each sensor module 100 within the transmission time interval, it is possible to suppress the occurrence of collision between the data, and the battery of the sensor module due to data retransmission. Problems such as a reduction in service life can be solved.

<About the hardware configuration of the sensor module>
FIG. 1 is a block diagram illustrating an example of the configuration of the sensor module 100 and the server device 200. First, the configuration of the sensor module 100 will be described.

As shown in FIG. 1, the sensor module 100 includes a sensor control unit 101 that controls the entire sensor module 100, a power supply unit 102, a sensor unit 103, a sensor communication unit 104, a measurement data storage unit 105, and an input. Unit 106 and operation setting parameter storage unit 107.

The input unit 106 enables various information such as setting information to be input to the sensor module 100. For example, the transmission time interval of the sensor module 100 and the measurement time interval can be set using the input unit 106.

The power supply unit 102 is a power supply for driving the sensor module 100, and is a replaceable battery in the present embodiment. However, the power supply unit 102 is not limited to a battery in the present invention, and may be a commercial power supply.

The sensor unit 103 measures a measurement target and thereby generates measurement data. The sensor unit 103 stores the generated measurement data in the measurement data storage unit 105. The measurement data includes measurement date / time information indicating the date / time measured by the sensor unit 103.

The measurement timing at which the sensor unit 103 generates measurement data is determined by the sensor control unit 101.

The sensor communication unit 104 communicates with an external device using a communication protocol such as TCP or UDP using a wireless line. The sensor communication unit 104 transmits / receives data to / from an external device connected via a wireless line in accordance with an instruction from the sensor control unit 101.

The sensor communication unit 104 transmits the measurement data stored in the measurement data storage unit 105 to the server device 200 that is an external device. The sensor control unit 101 determines the transmission timing at which the sensor communication unit 104 transmits measurement data.

When the server 200 receives the measurement data, the server 200 is configured to transmit a signal (reception completion message) indicating that the data has been received to the sensor module 100, here, an ACK signal. The sensor communication unit 104 also receives the ACK signal transmitted from the server device 200. By receiving the ACK signal, the sensor module 100 recognizes that the server device 200 has successfully received the data.

Further, the sensor communication unit 104 receives a setting change message including a transmission offset value transmitted from the server device 200. When the sensor communication unit 104 receives the setting change message, the sensor communication unit 104 stores the received transmission offset value in the operation setting parameter storage unit 107 and sets a flag indicating that the setting change is reserved in the operation setting parameter storage unit 107. Stand in the area.

The operation setting parameter storage unit 107 stores various parameters necessary for setting the operation of the sensor module 100, such as a transmission time interval, a transmission offset value, a measurement time interval, and whether there is a setting change reservation.

As described above, the sensor control unit 101 controls the entire sensor module 100, and an HDD or ROM that stores a program executed by the sensor control unit 101 or data necessary for executing the program. , RAM and the like and a CPU. Hereinafter, functions of the sensor control unit 101 will be described.

<About the function of the sensor control unit>
The sensor control unit 101 includes a measurement management unit 111 and a sensor communication control unit 112 as functional blocks. The measurement management unit 111 manages the operation of the sensor unit 103 in the sensor module 100. The measurement management unit 111 reads the measurement time interval stored in the operation setting parameter storage unit 107, energizes the sensor unit 103 via the power supply unit 102 for each measurement time interval, measures the data, and measures the measurement data. Is generated.

The sensor communication control unit 112 controls the communication with the server device 200 by controlling the sensor communication unit 104. The sensor communication control unit 112 reads the transmission time interval stored in the operation setting parameter storage unit 107, and energizes the sensor communication unit 104 via the power supply unit 102 at each transmission time interval to transmit measurement data. .

When the flag indicating that the setting change is reserved is set in the operation setting parameter storage unit 107, the sensor communication control unit 112 reads the stored transmission offset value, and the next measurement data Transmission is delayed by the time of the transmission offset value. That is, when the flag is set, the measurement data transmission interval is adjusted by delaying the data transmission once, and thereafter, the data is transmitted according to the set transmission time interval.

In the present invention, the measurement time interval and the transmission time interval are independent. The transmission time interval may be greater than or less than the measurement time interval. For example, when the setting change is to be reflected in the sensor module earlier, the transmission time interval is set shorter than the measurement time interval. Further, when the transmission time interval is shorter than the measurement time interval, measurement data is not accumulated and is not transmitted, but it is possible to transmit the state of the sensor module to the server device. In the following description, the measurement time interval and the transmission time interval are assumed to be different.

<Hardware configuration of server device>
Next, the configuration of the server device 200 will be described. As illustrated in FIG. 1, the server device 200 includes a server control unit 201 that controls the entire server device 200, a server communication unit 202, an operation setting parameter storage unit 203, and a measurement data history storage unit 204.

The server communication unit 202 communicates with an external device using a communication protocol such as TCP or UDP using a wireless line. The server communication unit 202 transmits and receives data to and from an external device connected via a wireless line in accordance with an instruction from the server control unit 201.

The server communication unit 202 receives measurement data transmitted from the sensor module 100 which is an external device. The server communication unit 202 stores the received measurement data in the measurement data history storage unit 204 with a measurement data ID that is identification information of the measurement data.

In the measurement data history storage unit 204, a measurement data DB in which measurement data is accumulated and a reception time management DB in which reception times are accumulated in association with sensor IDs each time measurement data is received are constructed.

FIG. 4 shows an example of the reception time management DB. Each time measurement data is received, the reception time, the measurement data ID for referring to the received measurement data, and the sensor ID of the sensor module 100 that is the transmission destination of the received measurement data are accumulated.

Further, as described above, when receiving the measurement data, the server communication unit 202 sends a signal (reception completion message) indicating that the data has been received to the sensor module 100 that is the transmission source of the measurement data. An ACK signal is transmitted.

Further, the server communication unit 202 transmits a setting change message including a transmission offset value to the corresponding sensor module 100 in accordance with a setting management table (see FIG. 8) described later stored in the operation setting parameter storage unit 203. To do. By receiving the setting change message, the sensor module 100 sets a flag indicating that the setting change is reserved as described above, and delays transmission of the next measurement data by the time of the transmission offset value.

The operation setting parameter storage unit 203 stores various tables and setting values necessary for calculating such a transmission offset value, including a setting management table (see FIG. 8).

Although details will be described later, the operation setting parameter storage unit 203 includes a sensor reception time management table (created or used by the server communication control unit 208, the transmission timing setting unit 205, and the change detection unit 209 of the server control unit 201). 5), a sensor ID table (see FIG. 6), a setting management table (see FIG. 8), a transmission time interval, and an existence determination time are stored.

Here, the transmission time interval stored in the operation setting parameter storage unit 203 is a unified transmission time interval of a plurality of sensor modules 100 connected to the server device 200. In the present embodiment, the transmission time interval is 60 seconds. Is illustrated.

Further, the presence determination time stored in the operation setting parameter storage unit 203 is a time used to determine the presence of the sensor module 100 connected to the server device 200. The time size of a sensor reception time management table (see FIG. 5) to be described later is determined by this existence determination time.

In the present embodiment, the existence determination time is the transmission time interval that is the minimum size. When the transmission time intervals of all the sensor modules 100 are set to be the same, the sensor connected to the server device 200 is specified by identifying the sensor module 100 that has received the measurement data at least for the transmission time interval. Module 100 can be identified.

In the present embodiment, the presence determination time and the transmission time interval are input using an input unit (not shown).

As described above, the server control unit 201 controls the entire server device 200. The server control unit 201 stores a program executed by the server control unit 201 or data necessary for executing the program, such as an HDD or a ROM. It is composed of a RAM or the like and a CPU. Hereinafter, functions of the server control unit 201 will be described.

<About the functions of the server control unit>
The server control unit 201 includes a server communication control unit 208, a transmission timing setting unit 205, and a change detection unit 209 as functional blocks.

The server communication control unit (reception time storage unit) 208 controls the sensor communication unit 204 to control the overall communication with the server device 200. When the server communication unit 202 receives the measurement data, the server communication control unit 208 accumulates the received measurement data in the measurement data history storage unit 204 with the measurement data ID and stores the measurement data in the measurement data DB. The reception time is stored in the reception time management DB in association with the measurement data ID and sensor ID.

Further, the server communication control unit 208 reads out the sensor ID from which the measurement data is transmitted within the presence determination time and the reception time from the reception time management DB constructed in the measurement data history storage unit 204, and the result is shown in FIG. A sensor reception time management table is created. In this embodiment, the server communication control unit 208 updates the sensor reception time management table every time it receives measurement data by communicating with one sensor module 100, and always manages the latest reception history.

Further, when the server communication control unit 208 controls the server communication unit 202 and the transmission timing setting unit 205 optimizes the transmission timing, the server management unit 208 stores the setting management stored in the operation setting parameter storage unit 203. A setting change message including a transmission offset value is transmitted to the corresponding sensor module 100 according to the table (see FIG. 8).

The transmission timing setting unit (transmission timing setting means) 205 refers to the sensor reception time management table for each of the plurality of sensor modules 100, and receives at least the reception time and sensor ID information corresponding to the transmission time interval. Then, based on the unified transmission time interval set in the plurality of sensor modules 100, the optimization for setting the transmission timing for transmitting the measurement data is performed.

The transmission timing setting unit 205 obtains an allocation time allocated to one sensor module 100, and sets the transmission timing for each of the plurality of sensor modules 100 so that data transmission of one sensor module 100 is performed within the allocation time. It is to set.

Specifically, the transmission timing setting unit 205 includes an allocation time calculation unit (first allocation time calculation unit) 206 and a transmission offset value calculation unit 207.

The allocated time calculation unit 206 refers to the sensor reception time management table, determines the number of connected sensor modules 100 based on the number of sensor IDs, and divides the transmission time interval by the number of sensor modules 100 determined. Calculate the allocation time.

The transmission offset value calculation unit 207 refers to the sensor reception time management table, acquires the reception time of each sensor module 100, and within the allocated time based on the allocation time calculated by the allocation time calculation unit 206. A transmission offset value that is a waiting time until the next measurement data is transmitted is calculated for each of the plurality of sensor modules 100 so that data transmission of one sensor module 100 is performed.

That is, the transmission timing setting unit 205 sets the transmission timing for each of the plurality of sensor modules 100 by setting the offset value calculated by the transmission offset value calculation unit 207, and optimizes the transmission timing. .

The transmission offset value calculated by the transmission timing setting unit 205 is stored in the setting management table in association with the sensor ID as shown in FIG. FIG. 8 shows a setting management table created for the six sensor modules SM-1 to SM-6 whose image of optimization is shown in FIG.

Sensor ID: “1”, “2”, “3”, “4”, “5”, “6” are sensor modules SM-1, SM-2, SM-3, SM-4, SM-5, SM Corresponds to -6. The sensor modules with sensor IDs “7”, “8”, “9”, and “10” are sensor modules that have already been disconnected from the server device 200.

The setting change reservation in the setting management table is changed from “1” with reservation to “2” without reservation when a setting change message is transmitted from the server communication unit 202, and the transmission offset value is also set to zero. Returned.

FIG. 7 shows sensor reception time data accumulated in the reception time management DB for four cycles whose optimization image is shown in FIG. At the timing indicated by arrow A, an interruption for optimization of transmission timing is instructed.

The transmission timing is optimized from the next sensor module SM-2 as the reference of the sensor module SM-3 of the sensor ID “3” that has received the measurement data after the timing indicated by the arrow A. When a setting change message including a transmission offset value is transmitted, measurement data is transmitted from the sensor module 100 that has received the message with a delay corresponding to the transmission time interval + the transmission offset value immediately after that. Thereafter, as usual, the measurement data is sent after a transmission time interval.

Furthermore, in the present embodiment, the transmission timing setting unit 205 is connected when the allocated time allocated to one sensor module 100 is smaller than the unit time in which the transmission timing can be set in each sensor module 100. A plurality of sensor modules 100 are grouped as a group of N (positive integers), which is a value obtained by dividing the transmission time interval by the unit time, and for each sensor module 100 in the group, the unit time For the fractional sensor module 100, the allocation time is determined according to the number of the fractional sensor modules 100, and the transmission timing is set based on the allocation time. Yes.

The change detection unit 209 extracts the sensor ID based on the sensor reception time management table and creates the sensor ID table shown in FIG. The change detection unit 209 detects whether the sensor module 100 has been changed based on the sensor ID table.

The transmission timing setting unit 205 optimizes the transmission timing for each of the sensor modules 100 when the transmission timing optimization is instructed and when the change detection unit 209 detects a change.

<Processing flow of data processing system>
Next, the flow of processing in the data processing system 1 will be described with reference to the flows in FIGS. 9 and 14.

FIG. 9 is a flowchart showing the flow of basic processing in the sensor module 100. As shown in FIG. 9, the sensor module 100 performs two processes, a measurement process (S1) and a data transmission / message reception process (S2).

FIG. 10 is a flowchart showing the flow of the measurement process (S11 in FIG. 9) of the sensor module 100. When the measurement time comes, the sensor unit 103 is energized and measured, the measurement data is added to the measurement data storage unit 105, and then the energization to the sensor unit 103 is turned off (S3 to S7).

FIG. 11 is a flowchart showing the flow of each data transmission / message reception process of the server apparatus 200 and the sensor module 100.

In the server device 200, the transmission time interval and presence determination time are input first (S11, S12). This is normally input by the administrator of the server device 200. Thereafter, the process proceeds to S13, and the sensor reception time management table shown in FIG. 5 is updated every time measurement data is received from the sensor module 100.

After the update, the process proceeds to S14, where it is determined whether the transmission timing optimization is instructed. If there is an instruction, the process proceeds to S16. On the other hand, if there is no instruction, the process proceeds to S15, and it is determined whether or not a change in the sensor module 100 to which the change detection unit 209 is connected is detected based on the sensor ID table shown in FIG. If the change detection unit 209 detects a change in the sensor module 100, the process also proceeds to S16. The processes in S13 to S15 are repeated until “YES” is determined in S14 or S15.

In S16, the sensor ID table is updated based on the sensor ID included in the sensor reception time management table. In S17, the transmission timing setting unit 205 refers to the sensor reception time management table, calculates a transmission offset value for optimizing the transmission timing for each sensor module 100 registered in the table, and FIG. The transmission offset value calculation process for updating the setting management table shown in FIG. The transmission offset value calculation process in S17 will be described later using the flowchart of the subroutine in FIG.

When the measurement data is received after performing the calculation process of the transmission offset value in S17 (S18), the setting management table shown in FIG. 8 is referred to the sensor module 100 that is the transmission source of the measurement data received in S18. It is then determined whether or not a setting change reservation has been made (S19).

If there is no setting change reservation, the process proceeds to S21, and a normal reception completion message is transmitted. If there is a setting change reservation, the process proceeds to S20, and a setting change message is transmitted together with a normal reception completion message. After transmitting the setting change message, the process proceeds to S22 and S23, and the setting change reservation for the sensor module 100 that has transmitted the change setting message in S20 in the setting management table shown in FIG.

The processes from S14 to S17 and the processes from S13 and S18 to S24 operate in separate threads. That is, even if the process of S24 is not completed, the process proceeds to S14 when the sensor reception management table is updated in S13. For example, in the transmission offset value calculation process of S17, even if the setting change reservation is entered for the sensor ID 15, and the transmission of the setting change reservation message in S20 has not yet been completed, If the reception time management table is updated and the optimization process is started, the transmission offset value is recalculated in S17. Therefore, the transmission offset value calculated one time before is not notified to the sensor module of the sensor ID 15 and is recalculated. The transmission offset value is reserved.

On the other hand, in the sensor module 100, when the measurement data transmission time comes (S31), the sensor communication unit 104 is energized (S32), and the measurement data is transmitted (S33). Thereafter, when a message from the server device 200 is received in S34, the energization to the sensor communication unit 104 is turned off (S35).

Thereafter, the process proceeds to S36, and the measurement data transmitted to the server apparatus 200 in S33 in the measurement data storage unit 105 is deleted. Then, it is determined whether or not a setting change message has been received from the server device 200 (S37). If not received, the process proceeds to S40, and a “transmission time interval” is set as a waiting time until the next data transmission. Then, the process proceeds to S39.

On the other hand, if the setting change message has been received from the server device 200 and it is determined “YES” in S37, the process proceeds to S38, where “transmission time interval + setting change message” is set as the waiting time until the next data transmission. "Transmission offset value included in" is set, and the process proceeds to S39.

In S39, the timer that is set in S40 or S38 and that sets the time until the next data transmission wait is started, and then the process returns to S31.

Subsequently, the transmission offset value calculation process, which is the process of S17 of FIG. 11, will be described using the flowchart of FIG.

First, the number of connected sensor modules 100 is obtained from the sensor reception time management table, and the number of groups is calculated. The number of groups is obtained by “number of sensor IDs / transmission time interval”. That is, the number of sensor IDs is divided by the time of the transmission time interval, and the “quotient” is set as the number of groups (S51). In the example of FIG. 3, since the number of sensor IDs is “6” and the transmission time interval is “60”, the number of groups is zero.

When the number of groups is 0, the process does not enter the loop 2 of S52 and the loop 3 of S53, and the process proceeds to S61, and the correction time (allocation time) is obtained by dividing the transmission time interval by the number of loops. In the example of FIG. 3 in which the sensor reception time management table is the content of FIG. 5, the correction value is 60 ÷ 6 = 10.

In S62, the loop count (4) of the loop 4 is obtained by “number of sensor IDs% transmission time interval”. That is, the “remainder value” when the number of sensor IDs is divided by the transmission time interval is the number of loops. In the example of FIG. 3, since the number of sensor IDs is “6” and the transmission time interval is “60”, the number of loops (4) is 6. That is, the processing from S62 to S68 is performed six times.

In S63, it is determined whether or not the loop count (4) = 1, and the process proceeds to S65 only when the loop count (4) = 1. In S65, the sensor reception time management table of FIG. 5 is referred to, and the loop count (4) = 1, that is, the latest reception time of the first sensor ID “3” is set as the “reference time”.

From the loop count (4) = 2, the process proceeds to S64, and the transmission offset value is calculated. The transmission offset value is obtained by “reference time−latest reception time of processing sensor module + correction value × (number of loops (4) −1)”.

That is, in the example of FIG. 3 in which the sensor reception time management table is the content of FIG. 5, it is as follows.

When the number of loops (4) = 2: The transmission offset value of the sensor ID “2” is “2011/1/31 10:15:03” − “2011/1/31 10:15:28” + 10 × (2 -1) =-15. Similarly, when the loop count (4) = 3: the transmission offset value of the sensor ID “6” is −10, and when the loop count (4) = 4: the transmission offset value of the sensor ID “5” is −5. When the number of loops (4) = 5: the transmission offset value of the sensor ID “1” = 0, and when the number of loops (4) = 6: the transmission offset value of the sensor ID “4” is = 5.

In subsequent S66, a transmission offset value correction process for correcting the transmission offset value calculated in S64 is performed, and thereafter, transmission of the transmission offset value is reserved in the setting management table of FIG. The transmission offset value correction process in S66 and the transmission offset value reservation process in S67 will be described later with reference to the subroutine flowcharts shown in FIGS.

In S51, when the number of groups becomes 1 or more, the process proceeds to S52, and the processes of S52 to S60 are performed for the number of groups. In S53, the processing of S53 to S59 is performed for the number of sensor modules 100 included in one group, which is obtained by dividing the transmission time interval by the unit time for which the sensor module 100 can set the transmission timing.

Next, the transmission offset correction process, which is the process of S66 of FIG. 12, will be described using the flowchart of FIG.

First, the transmission offset value is compared with the transmission time interval (S71), and if the transmission offset value is larger than the transmission time interval, the process proceeds to S72. In S72, the remainder when the transmission offset value is divided by the transmission time interval is set as the corrected transmission offset value.

On the other hand, if the transmission offset value is less than or equal to the transmission time interval, the process proceeds to S73. In S73, it is determined whether or not the transmission offset value is 0 or less. If it is 0 or less, the process proceeds to S74. In S74, a value obtained by adding the transmission offset value to the transmission time interval and the remainder when the transmission offset value is divided by the transmission time interval is set as a corrected transmission offset value.

In the example of FIG. 3, when the number of transmission loops (4) = 2 is corrected, the offset value is 45, and when the number of loops (4) = 3: the transmission offset value is 50, and the number of loops (4) = 4. When: The transmission offset value is 55, when the loop count (4) = 5: The transmission offset value is 0, and when the loop count (4) = 6: The transmission offset value is 5.

If the transmission offset value calculated in S64 of FIG. 12 is a positive value within the time of the transmission time interval, it is determined as “NO” in S71 and S73, and thus correction is not performed. Return to the main routine.

Next, the transmission offset value reservation process, which is the process of S67 of FIG. 12, will be described using the flowchart of FIG.

First, it is determined whether the transmission offset value is 0 (S81). If the transmission offset value is 0, the process returns to the main routine without making a reservation. On the other hand, if it is determined in S81 that it is not 0, the process proceeds to S82 and S83, in which the transmission offset value corresponding to the sensor module 100 being processed in the setting management table shown in FIG. 8 is input, and the setting change reservation is input.

15 (a) and 15 (b), the number of missing data, the number of retransmissions, and power consumption are measured for 64 sensor modules 100 before and after optimization of transmission timing. The comparison result is shown. The transmission time intervals were 60 seconds, 30 seconds, and 20 seconds. The settable unit time of the sensor module 100 used for verification is 1 second.

(A) in FIG. 15 is data before optimization. When the transmission time interval was 20 seconds, data loss occurred in three units. As for the contents, the data loss rate of 2 units was 0.56%, and the data loss rate of 1 unit was 3.9%. In addition, as many as six retransmissions occur at a transmission time interval of 20 seconds.

(B) in FIG. 15 is the data after optimization. Even if the transmission time interval was 20 seconds, the number of data loss was 0. Further, as can be seen from comparison of the number of retransmissions, it is extremely reduced even in 20 seconds, and it can be seen that collision of measurement data is effectively avoided. By reducing the number of retransmissions, the transmission time interval of 20 seconds can be reduced by 6.1% compared to the state before optimization.

As described above, by optimizing the transmission timing, the transmission timing of the measurement data of each sensor module 100 can be evenly distributed within the transmission time interval, and the occurrence of collision between the data can be suppressed. It is possible to reduce the power consumption of the sensor module 100 by retransmitting the measurement data and contribute to the extension of the battery life. In addition, it is possible to reliably reduce measurement data collection delay and collection omission of the server apparatus 200 due to retransmission of measurement data.

[Embodiment 2]
Another embodiment 2 of the present invention will be described. For convenience of explanation, members having the same functions as those in the drawings described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

In the first embodiment, the server device 200 refers to the sensor reception time management table, calculates an allocated time according to the number of sensor modules 100 that are actually connected, and includes one sensor module 100 within the allocated time. The transmission timing was set so that data transmission was performed.

On the other hand, in the second embodiment, the allocated time is calculated by adding the number of sensor modules that are actually connected to the number of sensor modules that are actually connected, and among the plurality of sensor modules that are actually connected, The transmission timing is set so that data transmission of a fictitious sensor module is performed before and after data transmission of a predetermined sensor module.

That is, as shown in FIG. 16, the transmission timing of the imaginary sensor module is arranged before and after the sensor module SM-6 corresponding to the predetermined sensor module, and the front and rear of the sensor module SM-6 are widely secured. Do not overlap with the measurement data.

FIG. 17 is a block diagram illustrating an example of the configuration of the server device 200A and the sensor module 100A according to the present embodiment.

The difference between the sensor module 100A and the sensor module 100 is that the sensor module 100A includes a reproduction number counting unit 113 that counts the number of retransmissions that is the number of retransmission processes, and the sensor communication unit 104 includes the reproduction number counting unit 113 together with the measurement data. This is the point to transmit the count value.

Further, the difference between the server device 200A and the server device 200 is that the server device 200A has a transmission timing setting unit 205A capable of setting a transmission timing in consideration of an aerial sensor module, and a preferential sensor designating unit 210. Is a point.

The transmission timing setting unit 205A replaces the allocation time calculation unit 206 with an allocation time calculation unit (second allocation time) that calculates the allocation time by adding the number of imaginary sensor modules to the number of connected sensor modules 100A. (Calculation means) 206A. In addition, the transmission timing setting unit 205A replaces the transmission offset value calculation unit 207 with the data of the imaginary sensor module before and after data transmission of the sensor module 100A that should be spaced apart from each other among the plurality of sensor modules 100A. A transmission offset value calculation unit 207A that calculates a transmission offset value for each sensor module 100A is provided so that transmission is performed.

The transmission offset value calculation unit 207A determines, based on the information on the number of retransmissions acquired together with the measurement data, the sensor module 100A in which the number of retransmissions exceeds the threshold as the sensor module 100A that should have the above-described interval. Hereinafter, the sensor module 100A that should have such a front-rear interval is referred to as a preferential sensor module.

The preferential sensor specification unit 210 enables arbitrary setting of the preferential sensor module 100A. The preferential sensor designation unit 210 recognizes the sensor module 100A of the sensor ID input by the user as the preferential sensor module 100A, and transmits the sensor ID to the transmission offset value calculation unit 207A.

Further, the allocated time calculation unit 206A sets the number of fictitious sensor modules according to the number of sensor modules 100A that are preferentially treated. If the number of preferentially treated sensor modules 100A is 1, the number of aerial sensor modules is 2 in order to make a space before and after that. That is, the number of aerial sensor modules is twice the number of preferential sensor modules 100A.

According to such a configuration of the server device 200A, it is possible to reliably collect important data by designating the sensor module 100A measuring important data with the preferential sensor designating unit 210.

In addition, since the radio wave condition is not so good, the sensor module 100A that is likely to be retransmitted is also identified as the preferential sensor module 100A and a wide interval is secured, so the number of retransmissions is reduced, and the sensor module The battery life of 100A can be improved.

As a modification of the present embodiment, as shown in FIG. 18, the sensor module has the same configuration as the sensor module 100 of the first embodiment, and the server device 200B refers to the reception time management DB table to It is good also as a structure provided with the deviation | shift amount detection part 211 which detects the deviation | shift amount of every transmission time interval.

The transmission timing setting unit 205B included in the server device 200B secures a wide interval before and after the sensor module 100 with the deviation amount exceeding the threshold as the preferential sensor module 100 based on the deviation amount detected by the deviation amount detection unit 211. To optimize the transmission timing.

With such a configuration, a wide interval is secured for the sensor module 100 in which the internal clock is easily shifted and the transmission timing is easily shifted. Therefore, it is possible to effectively avoid collision with the measurement data before and after the sensor module 100. The number of retransmissions of the module 100 and the sensor module 100 that transmits measurement data before and after the module 100 is reduced, and the battery life of the sensor module 100 can be improved.

[Embodiment 3]
Another embodiment 3 of the present invention will be described. For convenience of explanation, members having the same functions as those in the drawings described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

In the first embodiment, when the allocation time allocated to one sensor module 100 is smaller than the unit time in which the transmission timing can be set in each sensor module 100, the server device 200 is connected to a plurality of connected sensors. The modules 100 are grouped as a group of N (positive integer) values obtained by dividing the transmission time interval by the unit time, and the unit time is transmitted as the allocated time for each sensor module 100 in the group. The timing was set, and for the fractional sensor module 100, the allocation time was determined according to the number of the fractional sensor modules 100, and the transmission timing was set based on the allocation time.

On the other hand, as shown in FIG. 19, in the server device 300 of the present embodiment, when the allocated time is smaller than the unit time for which the timing can be set in each of the plurality of sensor modules 100, the allocated time A transmission time interval changing unit 212 that changes the transmission time interval so as to be equal to or longer than the unit time is provided. Here, the transmission time interval changing unit 212 changes the transmission time interval so that the unit time becomes the allocated time.

The difference between the server apparatus 200 of the first embodiment and the server apparatus 300 of the present embodiment is that the transmission time interval changing unit 212 is provided, the transmission timing setting unit 305 is implemented by the transmission timing setting unit 205. In addition, the grouping, which is performed when the allocation time allocated to one sensor module 100 is smaller than the unit time in which the transmission timing can be set in each sensor module 100, is not performed.

That is, in the transmission timing setting unit 305, as shown in FIG. 20, in the transmission offset value calculation process, in S91, the sensor ID registered in the sensor reception time management table rather than the value obtained by dividing the transmission time interval by the unit time. If the number is large, the process proceeds to S92, where the transmission time interval changing process is performed, and thereafter, the same S93 to S100 as the processes of S61 to S68 of FIG.

However, since the number of groups is not obtained in S94, the number of loops is the number of sensor IDs in the sensor reception time management table. In addition, in the transmission offset reservation process for the setting management table in S99, a transmission time interval is set even if the transmission offset value is zero. The transmission time interval is notified to all the sensor modules 100.

FIG. 21 shows a flowchart of a subroutine for transmission time interval change processing. In the transmission time interval changing process, the transmission time interval is changed to the number of unit time × sensor ID (S93). That is, when the unit time is 1 second and the number of sensor IDs is 80, the transmission time interval is set to 80 seconds (1 × 80), and the process returns to S61. Thus, in S61 to S68, the transmission offset value of each of the 80 sensor modules 100 is calculated so that the measurement data is transmitted to the 80 sensor modules 100 every second which is a unit time. The

As described above, when the number of sensor modules 100 to be connected is large and the allocation time is smaller than a unit time in which the transmission timing in the sensor module 100 can be set, the allocation time is forcibly set to a unit time or more. As described above, by widening the transmission time interval, collision of measurement data can be avoided more effectively, power consumption of the sensor module 100 can be reduced, and the battery life can be extended.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

Finally, each block of the

servers

200, 200A, and 200B, particularly the server control unit 201, may be configured by hardware logic, or may be realized by software using a CPU as follows.

That is, the

server devices

200, 200A, 200B, and 300 include a CPU (central processing unit) that executes a command of a control program that realizes each function, and a ROM that stores the program.
(Read only memory), a RAM (random access memory) for expanding the program, a storage device (recording medium) such as a memory for storing the program and various data, and the like. An object of the present invention is to enable the computer program codes (execution format program, intermediate code program, source program) of the

server devices

200, 200A, 200B, and 300, which are software for realizing the functions described above, to be read by a computer. This can also be achieved by supplying the recorded recording medium to the

server devices

200, 200A, 200B, 300, and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU). .

Examples of the recording medium include tapes such as magnetic tapes and cassette tapes, magnetic disks such as floppy (registered trademark) disks / hard disks, and disks including optical disks such as CD-ROM / MO / MD / DVD / CD-R. Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM / flash ROM.

Further, the

server devices

200, 200A, 200B, and 300 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available. Also, the transmission medium constituting the communication network is not particularly limited. For example, even in the case of wired such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc., infrared rays such as IrDA and remote control, Bluetooth ( (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

[Configuration of the present invention]
As described above, the information processing apparatus of the present invention is connected to a plurality of sensor modules that transmit data obtained by measurement to the outside via a network, and collects data by communicating with the plurality of sensor modules. Each of the plurality of sensor modules is a processing device, and the transmission time interval for transmitting data is set to be equal, and the reception time and data when the data is received when communicating with the plurality of sensor modules. The reception time storage means for storing the identification information of the sensor module that has transmitted at least the transmission time interval in the storage unit, and the reception time and identification read from the storage unit for each of the plurality of sensor modules Transmission timing setting means for setting a transmission timing for transmitting data based on the information and the transmission time interval The transmission timing setting means divides the time of the transmission time interval into a plurality of equal allocation times based on the number of the plurality of sensor modules, and data transmission of one sensor module is performed within the allocation time. As described above, the transmission timing is set for each of the plurality of sensor modules.

In the information processing apparatus of the present invention, the transmission timing setting means further determines the number of sensor modules connected from the identification information, and divides the time of the transmission time interval by the number of sensor modules. It can also be configured to include a first allocation time calculation means for calculating the allocation time.

According to the above configuration, the allocation time corresponding to the number of sensor modules actually connected is calculated, so that the transmission timing of each of the plurality of sensor modules is set with the allocation time calculated in this way. Thus, the number of actually connected sensor modules can be evenly distributed.

In the information processing apparatus of the present invention, the transmission timing setting means further determines the number of sensor modules connected from the identification information, and determines the time of the transmission time interval of the connected sensor modules. A second allocation time calculating means for calculating the allocation time by dividing the number by the value obtained by adding the number of imaginary sensor modules, and before and after data transmission of a predetermined sensor module of the plurality of sensor modules, The transmission timing may be set for each of the plurality of sensor modules so that the data transmission of the imaginary sensor module is performed.

According to the above configuration, since the allocation time is calculated based on the value obtained by adding the number of imaginary sensor modules to the number of sensor modules actually connected, the allocation time is calculated based on the number of sensor modules actually connected. It will be shorter than the appropriate allocation time.

However, the time for the fictitious sensor module secured by shortening the allocation time to transmit data (allocation time of the fictitious sensor module) is arranged before and after a predetermined sensor module among the plurality of sensor modules. Thus, it is possible to ensure a wide range before and after data transmission of the predetermined sensor module.

As a result, for example, by making a sensor module measuring important data, a sensor module whose transmission timing is easily shifted, or a sensor module having a large number of retransmissions as the predetermined sensor module, the data can be more effectively It is possible to more effectively reduce collection leakage and power consumption of the sensor module.

In this case, for example, the predetermined sensor module can be arbitrarily set, and the transmission timing setting unit may be configured to specify the predetermined sensor module based on the identification information of each sensor module.

Alternatively, each of the plurality of sensor modules performs a retransmission process of transmitting the data again when transmission of the data fails, transmits the number of retransmissions that is the number of retransmission processes to the server apparatus together with the data, The transmission timing setting means may be configured such that a sensor module whose number of retransmissions exceeds a threshold is the predetermined sensor module based on the acquired number of retransmissions.

Alternatively, the reception time of each of the plurality of sensor modules is accumulated and stored in a storage unit, and includes a shift amount detection unit that detects a shift amount of a transmission time interval for each sensor module, and the transmission timing setting unit includes the shift timing setting unit. Based on the amount of deviation detected by the amount detection means, a sensor module in which the amount of deviation exceeds a threshold may be used as the predetermined sensor module.

In the information processing apparatus according to the present invention, the transmission timing setting means further transmits next measurement data for each of the plurality of sensor modules so that data transmission of one sensor module is performed within the allocated time. Including an offset value calculating means for calculating an offset value that is a waiting time until transmission, and setting a transmission timing for each of the plurality of sensor modules by setting the offset value calculated by the offset value calculating unit. It can also be configured.

According to this, since the transmission timing is calculated as an offset value that is a waiting time until the next measurement data is transmitted for each of the plurality of sensor modules, the sensor module will transmit the measurement data next time. The transmission timing is changed by simply adding the offset value to this time.

In the information processing apparatus of the present invention, when the allocation time is smaller than a unit time for which timing can be set in each of the plurality of sensor modules, the allocation time is equal to or more than the unit time. The transmission time interval changing means for changing the transmission time interval is further provided, and the transmission timing setting means is changed by the transmission time interval changing means based on the number of the plurality of sensor modules. It is also possible to divide the time of the transmission time interval into a plurality of equally allocated times and set the transmission timing of each sensor module.

With this configuration, if the number of connected sensor modules is large and the allocation time is smaller than the unit time in which the transmission timing in the sensor module can be set, the allocation time is forcibly over the unit time. Thus, since the transmission time interval is widened, collision of data can be avoided more effectively, the power consumption of the sensor module can be reduced, and the battery life can be extended.

Further, in the information processing apparatus of the present invention, the reception time storage means may be configured to update the reception time and identification information every time it communicates with one of the plurality of sensor modules.

The information processing apparatus of the present invention further includes a change detection unit that detects that the plurality of sensor modules connected from the identification information read from the storage unit has changed, The transmission timing setting means may be configured to set the transmission timing for each of the sensor modules when a change is detected by the change detection means.

The sensor system of the present invention is characterized by including the above information processing apparatus and the plurality of sensors. Even in the above configuration, in the configuration in which each of the plurality of sensor modules transmits data to the server device at the same transmission time interval, the transmission timing of the data of each sensor module is evenly distributed within the transmission time interval, The occurrence of collision between data can be suppressed.

Note that the information processing apparatus of the present invention may be realized by a computer. In this case, a program that causes the computer to operate the information processing apparatus by operating the computer as the above-described means, and a program for recording the program are recorded. Such computer-readable recording media also fall within the scope of the present invention.

The present invention can be used in a sensor system that collects measurement data from a plurality of sensors.

1 Data processing system (sensor system)
DESCRIPTION OF SYMBOLS 100 Sensor module 100A Sensor module 101 Sensor control part 102 Power supply part 103 Sensor part 104 Sensor communication part 105 Measurement data storage part 106 Input part 107 Operation setting parameter storage part 111 Measurement management part 112 Sensor communication control part 113 Reproduction count counting part 200 Server Device

200A Server device

200B Server device 201 Server control unit 202 Server communication unit 203 Operation setting parameter storage unit 204 Sensor communication unit 204 Measurement data history storage unit 205 Transmission timing setting unit (transmission timing setting means)
205A Transmission timing setting unit (transmission timing setting means)
205B Transmission timing setting unit (transmission timing setting means)
206 Allocation time calculation unit (first allocation time calculation means)
206A Allocation time calculation unit (second allocation time calculation means)
207 Transmission offset value calculation unit (transmission timing setting means)
207A Transmission offset value calculation unit (transmission timing setting means)
208 Server communication control unit (management information storage means)
209 Change detection unit (change detection means)
210 Preferential sensor designation unit 211 Deviation amount detection unit (deviation amount detection means)
212 Transmission time interval changing unit (transmission time interval changing means)
300 Server device 305 Transmission timing setting unit

Claims

An information processing apparatus that is connected to a plurality of sensor modules that transmit data obtained by measurement to the outside via a network and that collects data by communicating with the plurality of sensor modules,
In each of the plurality of sensor modules, transmission time intervals for transmitting data are set to be equal,
Reception time storage means for storing the reception time at which data is received and the identification information of the sensor module that has transmitted the data in the storage unit at least for the transmission time interval when communicating with the plurality of sensor modules When,
For each of the plurality of sensor modules, comprising a transmission timing setting means for setting a transmission timing for transmitting data based on the reception time and identification information read from the storage unit and the transmission time interval,
The transmission timing setting means divides the time of the transmission time interval into a plurality of equal allocation times based on the number of the plurality of sensor modules, and data transmission of one sensor module is performed within the allocation time. In addition, an information processing apparatus is characterized in that transmission timing is set for each of the plurality of sensor modules.
The transmission timing setting means includes
A first allocation time calculation unit that determines the number of sensor modules connected from the identification information and calculates the allocation time by dividing the time of the transmission time interval by the number of sensor modules is provided. Item 4. The information processing apparatus according to Item 1.
The transmission timing setting means includes
The number of sensor modules connected is determined from the identification information, and the transmission time interval is divided by the number of sensor modules connected to the number of sensor modules connected to the allocated time. A second allocated time calculating means for calculating,
A transmission timing is set for each of the plurality of sensor modules so that data transmission of the fictitious sensor module is performed before and after data transmission of a predetermined sensor module among the plurality of sensor modules. The information processing apparatus according to claim 1.
The transmission timing setting means includes
Offset value calculation means for calculating an offset value that is a waiting time until the next measurement data is transmitted for each of the plurality of sensor modules so that data transmission of one sensor module is performed within the allocated time. Prepared,
The information processing according to any one of claims 1 to 3, wherein a transmission timing is set for each of the plurality of sensor modules by setting an offset value calculated by the offset value calculation means. apparatus.
The predetermined sensor module can be arbitrarily set,
The information processing apparatus according to claim 3, wherein the transmission timing setting unit specifies a predetermined sensor module based on identification information of each sensor module.
Each of the plurality of sensor modules performs retransmission processing to transmit the data again when transmission of the data fails, and transmits the number of retransmissions that is the number of retransmission processing to the information processing apparatus together with the data,
The information processing apparatus according to claim 3, wherein the transmission timing setting unit sets, as the predetermined sensor module, a sensor module whose number of retransmissions exceeds a threshold value based on the acquired number of retransmissions.
The reception time of each of the plurality of sensor modules is accumulated and stored in the storage unit, and includes a deviation amount detecting means for detecting the deviation amount of the transmission time interval for each sensor module,
4. The information according to claim 3, wherein the transmission timing setting means sets the sensor module whose deviation amount exceeds a threshold value as the predetermined sensor module based on the deviation amount detected by the deviation amount detection means. Processing equipment.
The information according to any one of claims 1 to 7, wherein the reception time storage means updates the reception time and the identification information every time communication is performed with one of the plurality of sensor modules. Processing equipment.
It further comprises change detection means for detecting that there is a change in the plurality of sensor modules connected from the identification information read from the storage unit,
9. The transmission timing setting unit according to claim 1, wherein when a change is detected by the change detection unit, the transmission timing is set for each of the sensor modules. The information processing apparatus described.
The transmission timing setting means sets the plurality of sensor modules to a transmission time interval when the allocated time is smaller than a unit time in which the transmission timing can be set in each of the plurality of sensor modules. N (positive integer) values divided by the unit time are grouped as one group, and for each sensor module in the group, the transmission timing is set using the unit time as the allocated time,
10. The fractional sensor module, wherein the allocation time is obtained according to the number of fractional sensor modules, and transmission timing is set based on the allocation time. Information processing device.
Transmission for changing the transmission time interval so that the allocated time becomes equal to or longer than the unit time when the allocated time is smaller than a unit time for which transmission timing can be set in each of the plurality of sensor modules. It further comprises a time interval changing means,
The transmission timing setting means divides the time of the transmission time interval changed by the transmission time interval changing means into a plurality of equal allocated times based on the number of the plurality of sensor modules, 10. The information processing apparatus according to claim 1, wherein transmission timing is set.
An information processing apparatus according to any one of claims 1 to 11,
A sensor system comprising a plurality of sensor modules.
A setting method for setting a transmission timing for transmitting the data for each of a plurality of sensor modules in which transmission time intervals for transmitting data obtained by measurement are set to be equal,
An acquisition step of acquiring the reception time when data was received and the identification information of the sensor module that transmitted the data at the time of the transmission time interval when communicating with the plurality of sensor modules;
For each of the plurality of sensor modules, including the reception time and identification information acquired in the acquisition step,
In the setting step, based on the number of the plurality of sensor modules, the time of the transmission time interval is divided into a plurality of equal allocation times, and data transmission of one sensor module is performed within the allocation time. A setting method comprising: setting a transmission timing for each of the plurality of sensor modules.
The program for functioning a computer as said each means with which the information processing apparatus of any one of Claim 1 to 11 is provided.
A computer-readable recording medium on which the program according to claim 14 is recorded.