JP6473092B2 - Wireless terminal, sensor network system, and wireless communication control method - Google Patents

Description

  The present invention relates to a wireless communication technique, and more particularly to a wireless communication control technique for wirelessly transmitting detection data detected by a sensor in a wireless terminal.

  In recent years, IoT (Internet of things) called the Internet of Things has attracted attention. In addition to conventional personal computers and servers, a variety of digitized devices, environments, and sensors attached to objects are connected to a network, thereby collecting enormous amounts of data. For the collection, wireless communication is often used from the viewpoint of workability. To collect high value-added information that could not be found in the past and create new services, such as once a day, once an hour, as was done with conventional remote monitoring In addition to low-frequency data collection, more detailed data collection and analysis are required.

  Conventionally, as a technique for wirelessly transmitting detection data detected by such a wireless terminal, when the temporal change rate of the detection data detected sequentially exceeds a set value, the detection data accumulated until then are batched Then, a method for wireless transmission has been proposed. This method is applied to a fire alarm that handles real-time data (see, for example, Non-Patent Document 1).

Japanese Patent No. 3029716

In general, in radio communication, communication frequency, communication distance, communication quality, and power consumption are in a trade-off relationship. Therefore, if low-power radio is selected, communication frequency, communication quality, and communication distance cannot be expected. Conversely, if communication frequency, communication distance, and communication quality are required, a radio that consumes a certain amount of power must be used. It is the present condition that we do not get.
In addition, since radio wave resources are limited, efficient use is desirable, and depending on the frequency band to be used, there are restrictions on the transmission frequency, time, etc., so it is necessary to pay close attention to its use.
In addition, even in a wireless terminal that is used for the same purpose, the required conditions vary depending on the situation, so it is necessary to select a wireless system that takes that into consideration.

FIG. 13 is a block diagram showing a configuration of a conventional wireless terminal. FIG. 14 is an explanatory diagram showing data transmission timing in a conventional wireless terminal.
For example, when a single wireless communication method as shown in FIG. 13 is used, if the transmission cycle of detection data transmitted from the wireless terminal is short, or if the wireless terminal is provided with a plurality of sensors, wireless communication is performed. The number of times of wireless communication with the terminal increases and the power consumption increases.

On the other hand, as shown in FIG. 14, if the transmission interval of the detection data is lengthened for extending the battery life, the time resolution of the detection data is deteriorated and the real-time property is impaired, so that it is difficult to detect the state change.
From the viewpoint of reducing the load on the network and server, if the amount of change in the detected data is small and the data acquisition is not significant, the amount of data transmitted from the wireless terminal should be reduced as much as possible. desirable.

  The present invention is for solving such problems, and provides a wireless communication control technology capable of efficiently transmitting detection data with less radio wave resources and power consumption without impairing the required time resolution. It is aimed.

In order to achieve such an object, a wireless terminal according to the present invention is a wireless terminal that wirelessly transmits detection data detected by a sensor to an access point connected to a host device so that data communication is possible. A first terminal wireless unit that performs wireless communication with a first communication performance; a second terminal wireless unit that performs wireless communication with a second communication performance higher than the first communication performance; and a sensor of the detection data A data monitoring unit that detects the presence or absence of a change in the sensor value by monitoring a value, and if the detection result indicates no change, extracts a part of the detection data as target data to be wirelessly transmitted; When the detection result indicates that there is a change, a data processing unit that extracts all of the detection data as the target data; and when the detection result indicates that there is no change, there is no first terminal. Part wirelessly transmit the target data by selecting, to indicate there variation result of the detection, and a terminal control unit for wirelessly transmitting a second terminal radio unit the target data by selecting the The data processing unit receives the detection data as the target data in response to a notification of a switchback instruction from the host device, the access point, or a communication device connected between the host device and the access point. The terminal control unit selects the first terminal radio unit and wirelessly transmits the target data in response to the notification of the switchback instruction.

Another wireless terminal according to the present invention is a wireless terminal that wirelessly transmits detection data detected by a sensor to an access point connected to a host device so as to be able to perform data communication. By monitoring a first terminal wireless unit that performs wireless communication with a second terminal wireless unit that performs wireless communication with a second communication performance higher than the first communication performance, and a sensor value of the detection data A data monitoring unit that detects whether or not the sensor value varies, and if the detection result indicates no variation, a part of the detection data is extracted as target data to be wirelessly transmitted, and the detection result varies A data processing unit that extracts all of the detection data as the target data when indicating presence, and a first terminal radio unit when the detection result indicates no change, and the target A terminal control unit that selects the second terminal wireless unit and wirelessly transmits the target data when the detection result indicates that there is a change, and the terminal control unit includes: , The second terminal radio unit is selected and the target data is selected in response to a notification of a switching instruction from the host device, the access point, or a communication device connected between the host device and the access point. Is to be transmitted wirelessly.

  Also, in one configuration example of the wireless terminal according to the present invention, the terminal control unit instructs the host device, the access point, or a communication device connected between the host device and the access point. In response to the notification, the second terminal wireless unit is selected and the target data is wirelessly transmitted.

  Also, in one configuration example of the wireless terminal according to the present invention, the data processing unit is instructed to switch from the host device, the access point, or a communication device connected between the host device and the access point. In response to this notification, all of the detection data is extracted as the target data.

  Also, in one configuration example of the wireless terminal according to the present invention, the first terminal wireless unit includes a one-way wireless communication unit that performs only wireless transmission of the target data.

  Also, in one configuration example of the wireless terminal according to the present invention, when the terminal control unit wirelessly transmits the target data from the second terminal wireless unit, a plurality of the target data are collectively transmitted. It is a thing.

The sensor network system according to the present invention includes a host device, an access point connected to the host device via a relay device, and a wireless terminal that performs wireless communication with the access point, and is mounted on the wireless terminal. A sensor network system that wirelessly transmits detection data detected by a sensor to the access point from the wireless terminal and collects the data by the host device via the relay device, wherein the wireless terminal is one of the wireless terminals described above It consists of

The wireless communication control method according to the present invention is a wireless communication control method used in a wireless terminal that wirelessly transmits detection data detected by a sensor to an access point connected to a host device so that data communication is possible. A first wireless communication step in which the first terminal wireless unit performs wireless communication with the first communication performance; and a second terminal wireless unit has a second communication performance higher than the first communication performance. A second wireless communication step for performing wireless communication; a data monitoring step for detecting whether or not the sensor value has changed by monitoring a sensor value of the detected data; and a data processing unit for detecting the detection When the result indicates no variation, a part of the detection data is extracted as target data to be wirelessly transmitted, and when the detection result indicates variation, the target data is the previous data. A data processing step of extracting all the detection data, the terminal control unit, wherein when the result of the detection indicates no variation, the target data wirelessly transmitted by selecting the first radio communication step, the A terminal control step of selecting the second wireless communication step and wirelessly transmitting the target data when the detection result indicates that there is a change , the data processing step comprising: the host device, the access point Or in response to a notification of a switchback instruction from a communication device connected between the higher-level device and the access point, a part of the detection data is extracted as the target data, and the terminal control step includes In response to the notification of the switchback instruction, the first wireless communication step is selected and the target data is wirelessly transmitted.
Another wireless communication control method according to the present invention is a wireless communication control method used in a wireless terminal that wirelessly transmits detection data detected by a sensor to an access point connected to a host device so that data communication is possible. A first wireless communication step in which the first terminal wireless unit performs wireless communication with the first communication performance, and a second communication in which the second terminal wireless unit is higher than the first communication performance. A second wireless communication step for performing wireless communication with performance, a data monitoring step in which a data monitoring unit detects whether or not the sensor value varies by monitoring a sensor value of the detection data, and a data processing unit, When the detection result indicates no variation, a part of the detection data is extracted as target data to be wirelessly transmitted. When the detection result indicates variation, the target data is extracted. A data processing step for extracting all of the detection data, and the terminal control unit, when the detection result indicates no variation, the first wireless communication step is selected and the target data is wirelessly transmitted, A terminal control step of selecting the second wireless communication step and wirelessly transmitting it as the target data when the detection result indicates that there is a change, wherein the terminal control step includes the host device, the access Point, or in response to a notification of a switching instruction from a communication device connected between the host device and the access point, the second wireless communication step is selected and the target data is wirelessly transmitted. Is.

  According to the present invention, when the sensor value variation is not detected, the first terminal radio unit is used, so that the detection data can be transmitted with less radio wave resources and power consumption, and the sensor value variation is detected. In this case, since the second terminal radio unit is used, detection data can be transmitted without impairing the required time resolution. Therefore, it is possible to efficiently transmit the detection data with less radio wave resources and power consumption without impairing the required time resolution.

It is a block diagram which shows the structure of the radio | wireless terminal concerning 1st Embodiment. 1 is a configuration example of a sensor network system according to a first embodiment. It is explanatory drawing which shows the data transmission timing concerning 1st Embodiment. It is a structural example of the sensor network system concerning 2nd Embodiment. It is explanatory drawing which shows the data transmission timing concerning 2nd Embodiment. It is a structural example of the sensor network system concerning 3rd Embodiment. It is explanatory drawing which shows the data transmission timing concerning 3rd Embodiment. It is a structural example of the sensor network system concerning 4th Embodiment. It is a block diagram which shows the structure of the radio | wireless terminal concerning 5th Embodiment. It is explanatory drawing which shows the radio | wireless part switching control operation | movement with the radio | wireless terminal concerning 5th Embodiment. It is a structural example of the sensor network system concerning 6th Embodiment. It is explanatory drawing which shows the data transmission timing concerning 6th Embodiment. It is a block diagram which shows the structure of the conventional radio | wireless terminal. It is explanatory drawing which shows the data transmission timing in the conventional radio | wireless terminal.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, with reference to FIG. 1 and FIG. 2, the radio | wireless terminal 10 and the sensor network system 1 concerning the 1st Embodiment of this invention are demonstrated. FIG. 1 is a block diagram illustrating a configuration of a wireless terminal according to the first embodiment. FIG. 2 is a configuration example of the sensor network system according to the first embodiment.

  As shown in FIG. 2, the sensor network system 1 according to the present invention includes a host device 50, an access point 20 connected to the host device 50 via the relay device 30 and the communication network 40, and wireless communication with the access point 20. The wireless terminal 10 is configured to transmit the detection data detected by the sensor mounted on the wireless terminal 10 wirelessly from the wireless terminal 10 to the access point 20, and is collected by the host device 50 via the relay device 30 and the communication network 40. System. Note that the configuration example shown in FIG. 2 is the most simplified configuration example for ease of explanation, and the wireless terminal 10, the access point 20, and the relay device 30 are as necessary. A plurality may be provided.

  The wireless terminal 10 according to the present invention is a wireless terminal used in such a sensor network system 1 and includes a plurality of terminal wireless units (14, 15) having different communication performances. The sensor (11) When wirelessly transmitting the detected detection data, a function of selecting a terminal wireless unit corresponding to the degree of variation regarding the sensor value of the detected data from these terminal wireless units and wirelessly transmitting to the access point 20 serving as a communication partner Have.

  The access point (AP) 20 has a plurality of AP wireless units (21, 22) having different communication performances, and the detection data wirelessly transmitted from the wireless terminal 10 serving as a communication partner is converted into APs corresponding to the communication performances. It has a function of receiving by the wireless unit and relaying and transferring to the higher-level device 50 via the relay device 30 and the communication network 40.

  Specific examples of these communication performances include communication speed or communication quality, or a combination of communication speed and communication quality. High communication performance means high communication speed or communication quality. In each embodiment, the case where the communication performance is composed of the communication speed will be described as an example. However, the present invention is not limited to this, and the communication performance may be the communication quality, which is a combination of the communication speed and the communication quality. May be.

The host device 50 is composed of an information processing device such as a server device as a whole, receives detection data detected by the wireless terminal 10 from the communication network 40 via the access point 20 and the relay device 30, and responds to these detection data. It has a function to provide various services.
The relay device 30 includes a relay device such as a gateway, and is arranged on a communication path between the wireless terminal 10 and the higher-level device 50, and relays and transfers detection data (target data) transmitted from the wireless terminal 10 to the higher-level device 50. It has a function.

[Wireless terminal]
The wireless terminal 10 includes, as main functional units, a sensor 11, a data monitoring unit 12, a data processing unit 13, a first terminal wireless unit 14, a second terminal wireless unit 15, a terminal control unit 16, and a terminal power supply unit. 17 is provided.

The sensor 11 includes a general sensor element, and has a function of detecting and outputting physical quantities such as temperature, humidity, vibration, and pressure as detection data.
The data monitoring unit 12 has a function of detecting whether or not the sensor value has changed by monitoring the sensor value of the detection data acquired from the sensor 11 at a constant reference period.

  The presence or absence of fluctuations in the detection data may be detected based on the change state of the sensor value. That is, when a predetermined calculation result exceeds a preset reference value, a change is detected. For example, it may be detected that there is a change when the difference between the sensor values of two detection data acquired continuously in time series exceeds a preset reference value. Alternatively, it may be detected that there is a change when the moving average value of the sensor values exceeds a preset reference value. In addition, it may be detected that there is a change when the sensor value exceeds a preset reference value. These reference values may be set as appropriate according to the physical response performance of the sensor 11 and detection data and the response characteristics required for the service provided using the detection data.

The data processing unit 13 has a function of extracting a part or all of the detection data as target data to be wirelessly transmitted depending on whether or not the detection data detected by the data monitoring unit 12 varies.
As a more specific function, when the detection result indicates no change, the data processing unit 13 extracts a part of the detection data as target data to be wirelessly transmitted, and the detection result indicates that there is a change. Has a function of extracting all detection data as target data.

  The first terminal radio unit 14 receives the detection data output from the terminal control unit 16, and uses the preset first communication speed (data transfer rate) radio communication method as an access point 20 serving as a communication partner. It has a function of wireless transmission to.

  The second terminal wireless unit 15 receives the detection data output from the terminal control unit 16, and is a wireless communication method with a preset second communication speed (data transfer rate) faster than the first communication speed. It has a function of wirelessly transmitting to the access point 20 as a communication partner.

The terminal control unit 16 has a function of switching and selecting either the first terminal radio unit 14 or the second terminal radio unit 15 depending on whether or not the detected data detected by the data processing unit 13 varies, and data It has a function of receiving the detection data output from the processing unit 13 and outputting the detection data to either the first terminal radio unit 14 or the second terminal radio unit 15 selected for switching.
As a more specific function, when the detection result indicates no change, the terminal control unit 16 selects the first terminal radio unit 14 to wirelessly transmit the target data, and the detection result changes. In this case, the second terminal radio unit 15 is selected and wirelessly transmitted as target data.

  The terminal power supply unit 17 has a function of supplying operating power to each functional unit of the wireless terminal 10. At this time, in accordance with an instruction from the terminal control unit 16, the operating power is supplied to only one of the first terminal radio unit 14 and the second terminal radio unit 15, and the supply of the operating power to the other is stopped. May be.

[access point]
The access point (AP) 20 includes a first AP wireless unit 21, a second AP wireless unit 22, an AP control unit 23, a communication I / F unit 24, and an AP power supply unit 25 as main functional units. It has been.

The first AP wireless unit 21 has a function of receiving detection data (target data) wirelessly transmitted from the first terminal wireless unit 14 of the wireless terminal 10 by using a wireless communication method having a preset first communication speed. have.
The second AP wireless unit 22 is wirelessly transmitted from the second terminal wireless unit 15 of the wireless terminal 10 in a wireless communication scheme with a second communication speed set in advance higher than the first communication speed ( Target data).

  The AP control unit 23 receives the detection data received by the first AP radio unit 21 or the second AP radio unit 22, and receives the detection data from the communication I / F unit 24 via the relay device 30 and the communication network 40. To the wireless terminal 10 from the first AP wireless unit 21 or the second AP wireless unit 22 received from the communication I / F unit 24 and various instructions transmitted from the host device 50 and the relay device 30 It has the function to do.

  The communication I / F unit 24 performs data communication with the host device 50 via the relay device 30 and the communication network 40, thereby detecting the detection data transmitted from the wireless terminal 10 to the host device 50, the host device 50, and the relay device. It has a function of exchanging various instructions transmitted from 30 to the wireless terminal 10.

  The AP power supply unit 25 has a function of supplying operating power to each functional unit of the access point 20. At this time, in response to an instruction from the AP control unit 23, the operating power is supplied to only one of the first AP wireless unit 21 and the second AP wireless unit 22, and the supply of the operating power to the other is stopped. May be.

[Operation of First Embodiment]
Next, with reference to FIG. 3, the wireless transmission control operation led by the terminal in the wireless terminal 10 according to the present embodiment will be described. 3A and 3B are explanatory diagrams showing data transmission timing according to the first embodiment. FIG. 3A shows a case of individual transmission, and FIG. 3B shows a case of batch transmission.
Here, the transmission timing of the first terminal radio unit corresponds to 1/5 of the detection time resolution of the detection data detected by the sensor 11, and the transmission timing of the second terminal radio unit corresponds to the detection time resolution. Will be described as an example.

The data monitoring unit 12 monitors the sensor value of the detection data acquired from the sensor 11 at a constant reference period, thereby detecting whether the sensor value has changed.
Here, in the period T1 in FIG. 3A, since the sensor value of the detection data is relatively stable, the data monitoring unit 12 detects that there is no change in the sensor value. For this reason, after no change is detected, the data processing unit 13 extracts a part of the detected data as the target data to be wirelessly transmitted at a rate of once every 5 times corresponding to no change. It will be.

  Further, the terminal control unit 16 selects the first terminal radio unit 14 according to the detection result without fluctuation, and the target data extracted by the data processing unit 13 is output to the first terminal radio unit 14. The Thereby, the target data extracted from the detected data at a rate of once every five times is wirelessly transmitted from the first terminal radio unit 14 to the access point 20 at the first communication speed.

  In the subsequent period T2 in FIG. 3A, the sensor value of the detected data starts to fluctuate to some extent, so that the data monitoring unit 12 detects that the sensor value has fluctuated. For this reason, after the presence of fluctuation is detected, the data processing unit 13 extracts all of the detected data, that is, once as a target data to be wirelessly transmitted at a rate corresponding to the fluctuation. become.

  Further, the terminal control unit 16 selects the second terminal radio unit 15 according to the detection result with fluctuation, and the target data extracted by the data processing unit 13 is output to the second terminal radio unit 15. The Thereby, the target data extracted from the detection data at a rate of once at a time from the second terminal wireless unit 15 to the access point 20 is individually wirelessly transmitted at the first communication speed.

  Thereafter, in the period T3 in FIG. 3A, since the fluctuation of the sensor value is settled and stabilized, the data monitoring unit 12 detects that there is no fluctuation of the sensor value. For this reason, in the data processing unit 13, in the same manner as in the above-described period T 1, after no change is detected, a part of the detected data, that is, once every 5 times corresponding to no change, is wirelessly transmitted. It will be extracted as target data to be transmitted.

  Further, according to the detection result without fluctuation, the terminal control unit 16 selects the first terminal radio unit 14 and the target data extracted by the data processing unit 13 is the same as the period T1 described above. 1 to the terminal radio unit 14. Thereby, the target data extracted from the detected data at a rate of once every five times is wirelessly transmitted from the first terminal radio unit 14 to the access point 20 at the first communication speed.

In the period T2, as shown in FIG. 3B, a plurality of pieces of target data may be collectively transmitted without being individually transmitted wirelessly.
In this case, the terminal control unit 16 accumulates, for example, five pieces of target data extracted by the data processing unit 13 according to the detection result with fluctuation, and collects the data into one batch data, and the second terminal radio The unit 15 may wirelessly transmit to the access point 20.

[Effect of the first embodiment]
As described above, in this exemplary embodiment, the first terminal wireless unit 14 that performs wireless communication with the first communication performance and the second terminal that performs wireless communication with the second communication performance higher than the first communication performance. The wireless monitoring unit 15 is provided, the data monitoring unit 12 monitors the sensor value of the detection data detected by the sensor 11 to detect whether or not the sensor value varies, and the data processing unit 13 detects the detected data according to the presence or absence of the variation. Are extracted as target data to be wirelessly transmitted, and the terminal control unit 16 selects either the first terminal wireless unit 14 or the second terminal wireless unit 15 according to the presence or absence of fluctuation. The target data is wirelessly transmitted.

  More specifically, in the data processing unit 13, when the detection result indicates no variation, a part of the detection data is extracted as target data, and when the detection result indicates variation, the detection data Are extracted as target data, and in the terminal control unit 16, when the detection result indicates no change, the first terminal radio unit 14 is selected and the target data is wirelessly transmitted, and the detection result changes. When the presence is indicated, the second terminal wireless unit 15 is selected and wirelessly transmitted as target data.

  In general, when the sensor value of the detection data is relatively stable without fluctuation, the content of the service provided by the host device 50 does not change greatly. For this reason, it is not necessary to frequently transmit detection data, and the time resolution of target data to be wirelessly transmitted from the wireless terminal 10 to the higher-level device 50 may be low. On the other hand, when the sensor value of the detection data is relatively fluctuating, the content of the service provided by the higher-level device 50 is likely to change. For this reason, it is necessary to frequently transmit detection data, and it is necessary to increase the time resolution of target data to be wirelessly transmitted from the wireless terminal 10 to the host device 50.

  The present invention pays attention to the relationship between such sensor value fluctuation and the time resolution of the target data to be wirelessly transmitted to the host device 50. When no sensor value fluctuation is detected, the communication performance is relatively low. If the lower first terminal radio unit 14 is selected and the target data is transmitted wirelessly, and a change in sensor value is detected, the second terminal radio unit 15 with relatively high communication performance is selected and the target data is selected. Data is transmitted wirelessly.

  Usually, as the communication performance increases, the required radio wave resources and power consumption tend to increase. According to the present invention, when the sensor value fluctuation is not detected, the first terminal radio unit 14 is used, so that the detection data can be transmitted with less radio wave resources and power consumption, and the sensor value fluctuation is detected. In such a case, since the second terminal radio unit 15 is used, detection data can be transmitted without impairing the required time resolution. Therefore, it is possible to efficiently transmit the detection data with less radio wave resources and power consumption without impairing the required time resolution.

[Second Embodiment]
Next, with reference to FIG. 4, the radio | wireless terminal 10 and the sensor network system 1 concerning the 2nd Embodiment of this invention are demonstrated. FIG. 4 is a configuration example of a sensor network system according to the second embodiment.

  In the first embodiment, the case where the wireless terminal 10 performs wireless transmission control under the initiative has been described as an example. In the present embodiment, when the wireless terminal 10 and the higher-level device 50 perform wireless transmission control in cooperation, the higher-level device 50 particularly performs switching control from the second terminal wireless unit 15 to the first terminal wireless unit 14. The case where it performs is demonstrated.

  In the present embodiment, the data processing unit 13 responds to the switch-back instruction notified from the host device 50 based on the change detected by the host device 50 from the sensor value of the target data wirelessly transmitted from the wireless terminal 10. , And has a function of switching control so that a part of the detection data is extracted as the target data.

Further, the terminal control unit 16 has a function of performing switching control so that the first terminal radio unit 14 is selected in accordance with the switch-back instruction notified from the host device 50 and the target data is wirelessly transmitted.
Other configurations of the wireless terminal 10 are substantially the same as those of the first embodiment, and detailed description thereof is omitted here.

As the configuration of the host device 50, a data monitoring unit that detects whether or not the sensor value has changed by monitoring the sensor value of detection data (target data) wirelessly transmitted from the wireless terminal 10, and no change is detected by the data monitoring unit. In such a case, a communication control unit that notifies the wireless terminal 10 of a switchback instruction may be provided.
Alternatively, the communication control unit instructs the wireless terminal 10 to switch back in response to an unnecessary determination of high time resolution regarding the detection data in the application processing unit that provides services based on the detection data from the wireless terminal 10 in the host device 50. May be notified.

[Operation of Second Embodiment]
Next, with reference to FIG. 5, the radio transmission control operation in cooperation with the host device 50 in the radio terminal 10 according to the present embodiment will be described. FIG. 5 is an explanatory diagram showing data transmission timing according to the second embodiment. FIG. 5A shows the case of individual transmission, and FIG. 5B shows the case of batch transmission.
Here, the transmission timing of the first terminal radio unit corresponds to 1/5 of the detection time resolution of the detection data detected by the sensor 11, and the transmission timing of the second terminal radio unit corresponds to the detection time resolution. Will be described as an example.

  In the period T2 in FIG. 5A, since the sensor value of the detected data starts to fluctuate to some extent, the data monitoring unit 12 detects that the sensor value has fluctuated. For this reason, the data processing unit 13 thereafter extracts all of the detected data from the detection data, that is, the target data to be wirelessly transmitted at a rate of once per time corresponding to the variation.

  Further, the terminal control unit 16 selects the second terminal radio unit 15 according to the detection result with fluctuation, and the target data extracted by the data processing unit 13 is output to the second terminal radio unit 15. The Thus, after the presence of fluctuation is detected, the target data extracted from the detected data at a rate of once per second from the second terminal radio unit 15 to the access point 20 is the second communication. Individually transmitted at a speed.

  Thereafter, in the period T3 in FIG. 5A, since the fluctuation of the sensor value is settled and stabilized, the host device 50 detects that there is no fluctuation of the sensor value, and notifies the wireless terminal 10 of the switch back instruction. . In response to the reception of the switchback instruction by the second terminal radio unit 15, the data processing unit 13 subsequently performs a part from the detected data, that is, 1 every 5 times corresponding to no change, in the same manner as in the period T1. It is extracted as target data to be wirelessly transmitted at the rate of times.

  Further, in response to the reception of the switchback instruction, the terminal control unit 16 selects the first terminal radio unit 14 in the same manner as the period T1, and the target data extracted by the data processing unit 13 is the first data It is output to the terminal radio unit 14. Thereby, after the switch back instruction, the target data extracted from the detected data at a rate of once every five times is wirelessly transmitted from the first terminal radio unit 14 to the access point 20 at the first communication speed. Sent.

In addition, when transmitting the target data extracted from the detection data at a rate of once, as shown in FIG. 5B, the individual target data is not individually transmitted wirelessly, but a plurality of the target data is collected. You may send in batch.
In this case, the terminal control unit 16 accumulates, for example, five pieces of target data extracted by the data processing unit 13 according to the detection result with fluctuation, and collects the data into one batch data, and the second terminal radio The unit 15 may wirelessly transmit to the access point 20.

[Effect of the second embodiment]
Thus, in the present embodiment, the data processing unit 13 extracts a part of the detection data as the target data in response to the switch-back instruction notified from the higher-level device 50, and the terminal control unit 16 The first terminal radio unit 14 is selected in response to the switch back instruction, and the target data is wirelessly transmitted.

  Thereby, after it is detected in the host device 50 that the fluctuation of the sensor value has fallen, the wireless terminal 10 is switched back from the second terminal wireless unit 15 to the first terminal wireless unit 14. become. Therefore, the usage period of the second terminal radio unit 15 can be appropriately switched according to the presence or absence of fluctuation detected on the host device 50 side, and more stable radio transmission control can be realized.

Note that when this embodiment is implemented in combination with the first embodiment, both the wireless terminal 10 and the host device 50 can confirm that there is no change in sensor value, and there is no change. It is possible to realize more accurate and stable wireless transmission control with extremely little detection error.
On the other hand, when this embodiment is implemented independently, the host device 50 can take the lead in confirming that there is no change in the sensor value, and more efficient according to the necessity of detection data in the host device 50. Wireless transmission control can be realized.

[Third Embodiment]
Next, with reference to FIG. 6, the radio | wireless terminal 10 and the sensor network system 1 concerning the 3rd Embodiment of this invention are demonstrated. FIG. 6 is a configuration example of a sensor network system according to the third embodiment.

  In the second embodiment, the case of switching back from the second terminal radio unit 15 to the first terminal radio unit 14 in response to the switch-back instruction from the host device 50 has been described as an example. In the present embodiment, when the wireless terminal 10 and the upper apparatus 50 perform wireless transmission control in cooperation, the upper apparatus 50 particularly performs switching control from the first terminal wireless unit 14 to the second terminal wireless unit 15. The case will be described.

In the present embodiment, the terminal control unit 16 performs the first operation according to the switching instruction notified from the higher-level device 50 based on the change detected by the higher-level device 50 from the sensor value of the target data wirelessly transmitted from the wireless terminal 10. 2 has a function of selecting the terminal wireless unit 15 and wirelessly transmitting the target data.
Other configurations of the wireless terminal 10 are substantially the same as those of the first embodiment and the second embodiment, and detailed description thereof is omitted here.

As a configuration of the host device 50, a data monitoring unit that detects whether or not the sensor value has changed by monitoring a sensor value of detection data (target data) wirelessly transmitted from the wireless terminal 10, and a change in the data monitoring unit is detected. In such a case, a communication control unit that notifies the wireless terminal 10 of a switching instruction may be provided.
Alternatively, the communication control unit issues a switching instruction to the wireless terminal 10 according to the necessity determination of the high time resolution regarding the detection data in the application processing unit that provides a service based on the detection data from the wireless terminal 10 in the host device 50. You may make it notify.

[Operation of Third Embodiment]
Next, with reference to FIG. 7, the radio transmission control operation in cooperation with the host device 50 in the radio terminal 10 according to the present embodiment will be described. FIG. 7 is an explanatory diagram showing data transmission timing according to the third embodiment. FIG. 7A shows the case of individual transmission, and FIG. 7B shows the case of batch transmission.
Here, the transmission timing of the first terminal radio unit corresponds to 1/5 of the detection time resolution of the detection data detected by the sensor 11, and the transmission timing of the second terminal radio unit corresponds to the detection time resolution. Will be described as an example.

  In the period T2 in FIG. 7A, since the sensor value of the detected data starts to fluctuate to some extent, the data monitoring unit 12 detects that the sensor value has fluctuated. For this reason, in the data processing unit 13, after the presence of fluctuation is detected, all of the detected data, that is, once per time corresponding to the fluctuation is extracted as target data to be wirelessly transmitted.

  At this time, even after the presence of a change is detected, the terminal control unit 16 outputs the target data extracted by the data processing unit 13 to the first terminal radio unit 14 as before. As a result, the target data extracted from the detection data at a rate of once at a time from the first terminal wireless unit 14 to the access point 20 is individually wirelessly transmitted at the first communication speed. Become.

  Thereafter, the host device 50 detects that the sensor value has changed, and notifies the wireless terminal 10 of a switching instruction. In response to reception of the switching instruction by the first terminal radio unit 14, the terminal control unit 16 selects the second terminal radio unit 15, and the target data extracted by the data processing unit 13 is the second terminal radio. Is output to the unit 15. Thereby, after the switching instruction, the target data extracted from the detection data at a rate of once per time from the detection data to the access point 20 from the second terminal radio unit 15 individually at the second communication speed. It will be transmitted wirelessly.

In addition, when transmitting the target data extracted from the detection data at a rate of once, as shown in FIG. 7B, individual target data is not individually transmitted wirelessly, but a plurality of the target data is collected. You may send in batch.
In this case, according to the detection result with fluctuation, the terminal control unit 16 accumulates, for example, five pieces of target data extracted by the data processing unit 13 and collects them into one batch data, and the first terminal radio Wireless transmission may be performed from the unit 14 or the second terminal wireless unit 15 to the access point 20.

[Effect of the third embodiment]
As described above, in the present embodiment, the terminal control unit 16 selects the second terminal radio unit 15 in accordance with the switching instruction notified from the higher-level device 50 and wirelessly transmits the target data. is there.

  As a result, the host device 50 switches from the first terminal radio unit 14 to the second terminal radio unit 15 after the change in sensor value is detected. Therefore, the usage period of the second terminal radio unit 15 can be appropriately switched according to the presence or absence of fluctuation on the higher-level device 50 side, and more efficient radio transmission control can be realized.

Note that when this embodiment is implemented in combination with the first embodiment, both the wireless terminal 10 and the host device 50 can confirm that the sensor value varies, and there is variation. It is possible to realize more accurate and stable wireless transmission control with extremely little detection error.
On the other hand, when the present embodiment is implemented independently, the host device 50 can take the lead in confirming that there is a change in sensor value, and more efficient according to the necessity of detection data in the host device 50. Wireless transmission control can be realized.
Further, when implemented in combination with the second embodiment, the host device 50 can take the lead in confirming the presence or absence of fluctuations in sensor values. Efficient wireless transmission control can be realized.

[Fourth Embodiment]
Next, with reference to FIG. 8, the radio | wireless terminal 10 and the sensor network system 1 concerning the 4th Embodiment of this invention are demonstrated. FIG. 8 is a configuration example of a sensor network system according to the fourth embodiment.

  In the second and third embodiments, the case where the wireless terminal 10 performs wireless transmission control in cooperation with the higher-level device 50 has been described. However, as illustrated in FIG. A case where wireless transmission control is performed in cooperation with the relay device 30 will be described. Note that the device with which the wireless terminal 10 cooperates is not limited to the relay device 30, and can cooperate with the access point 20 or a communication device connected between the host device 50 and the access point 20. It is.

  In the present embodiment, relay device 30 has a partial function of host device 50 described in the second and third embodiments, that is, detection data wirelessly transmitted from second terminal wireless unit 15 of wireless terminal 10. A function of detecting whether or not the sensor value has changed by monitoring the sensor value of (target data) and a function of notifying the wireless terminal 10 of a switchback instruction when no change is detected, or a change When the presence is detected, the wireless terminal 10 has a function of notifying a switching instruction.

  Thereby, it is possible to detect whether or not the sensor value varies, not by the relay device 30 but by the relay device 30 (communication device) closer to the wireless terminal 10. Therefore, it is possible to reduce the load on communication resources such as the communication network 40 located in the section from the relay device 30 (communication device) to the host device 50.

[Fifth Embodiment]
Next, with reference to FIG. 9, a radio terminal 10 and a sensor network system 1 according to a fifth embodiment of the present invention will be described. FIG. 9 is a block diagram illustrating a configuration of a wireless terminal according to the fifth embodiment.

  In the first to second embodiments, the case where both the first terminal radio unit 14 and the second terminal radio unit 15 perform radio communication in both directions has been described as an example. In the present embodiment, a case will be described in which the first terminal wireless unit 14 performs wireless communication in one direction, that is, only performs wireless transmission, and the second terminal wireless unit 15 performs wireless communication in both directions.

In the present embodiment, the first terminal radio unit 14 includes a one-way radio communication unit that performs only radio transmission of target data.
Other configurations of the wireless terminal 10 are substantially the same as those of the first embodiment and the second embodiment, and detailed description thereof is omitted here.

[Operation of Fifth Embodiment]
Next, with reference to FIG. 10, operation | movement of the radio | wireless terminal 10 concerning this Embodiment is demonstrated. FIG. 10 is an explanatory diagram of a wireless unit switching control operation in the wireless terminal according to the fifth embodiment.
Here, similarly to the first embodiment, the first terminal radio unit 14 and the second terminal radio unit 15 are controlled to be switched according to whether or not the sensor value detected by the data monitoring unit 12 varies. The case will be described.

When no change is detected in the period T1 of FIG. 10, the terminal control unit 16 selects the first terminal radio unit 14 (TTX1_ON), and the first AP radio unit 21 (ARX1_ON) of the access point 20 In contrast, the target data is wirelessly transmitted in one direction.
After this, if a change is detected in the period T2, the terminal control unit 16 immediately stops the radio transmission from the first terminal radio unit 14 and selects the second terminal radio unit 15 (TTX2_ON , TRX2_ON).

Thereby, in response to the stop of the wireless transmission from the first terminal wireless unit 14, the second AP wireless unit 22 of the access point 20 is selected (ATX2_ON, ARX2_ON), a switching request is transmitted, and the second Received by the terminal radio unit 15.
In response to this, the terminal control unit 16 starts bidirectional wireless communication between the second terminal wireless unit 15 and the second AP wireless unit 22. Thereby, wireless transmission of the target data is started from the second terminal wireless unit 15 to the second AP wireless unit 22.

  Thereafter, when a switchback request is transmitted from the second AP radio unit 22 of the access point 20, the terminal control unit 16 stops the second terminal radio unit 15 and switches the first terminal radio unit 14. Select (TTX1_ON), and start one-way wireless communication with the first AP wireless unit 21 (ARX1_ON). Thereby, wireless transmission of the target data is started from the first terminal wireless unit 14 to the first AP wireless unit 21.

[Effect of Fifth Embodiment]
As described above, in the present embodiment, the first terminal radio unit 14 is composed of the one-way radio communication unit that performs only radio transmission of the target data. Since it is not necessary to perform the reception of the power, the power consumption is reduced. For this reason, it is possible to reduce the power consumption required for wireless communication compared to the case where bidirectional wireless communication is performed.

[Sixth Embodiment]
Next, with reference to FIG. 11, a radio terminal 10 and a sensor network system 1 according to a sixth embodiment of the present invention will be described. FIG. 11 is a configuration example of a sensor network system according to the sixth embodiment.

  In the third embodiment, when the host device 50 performs switching control from the first terminal radio unit 14 to the second terminal radio unit 15, the radio terminal 10 detects that the sensor value has changed, The case where all the detection data is extracted as target data has been described as an example. In the present embodiment, a case will be described in which all detection data is extracted as target data in response to a switching instruction from the host device 50.

In the present embodiment, the data processing unit 13 responds to the switching instruction notified from the host device 50 based on the change detected by the host device 50 from the sensor value of the target data wirelessly transmitted from the wireless terminal 10. It has a function of extracting all detection data as target data.
The terminal control unit 16 has a function of selecting the second terminal radio unit 15 in response to the switching instruction and transmitting the target data by radio.
Other configurations of the wireless terminal 10 are substantially the same as those of the third embodiment, and detailed description thereof is omitted here.

As a configuration of the host device 50, a data monitoring unit that detects whether or not the sensor value fluctuates by monitoring a sensor value of detection data (target data) wirelessly transmitted from the second terminal wireless unit 15 of the wireless terminal 10, and When the data monitoring unit detects that there is a change, a communication control unit that notifies the wireless terminal 10 of a switching instruction may be provided.
Alternatively, the communication control unit issues a switching instruction to the wireless terminal 10 according to the necessity determination of the high time resolution regarding the detection data in the application processing unit that provides a service based on the detection data from the wireless terminal 10 in the host device 50. You may make it notify.

[Operation of Sixth Embodiment]
Next, with reference to FIG. 12, the radio transmission control operation in cooperation with the host device 50 in the radio terminal 10 according to the present embodiment will be described. 12A and 12B are explanatory diagrams showing data transmission timing according to the sixth embodiment. FIG. 12A shows a case of individual transmission, and FIG. 12B shows a case of batch transmission.
Here, the transmission timing of the first terminal radio unit corresponds to 1/5 of the detection time resolution of the detection data detected by the sensor 11, and the transmission timing of the second terminal radio unit corresponds to the detection time resolution. Will be described as an example.

In the second half of the period T1 in FIG. 12A, the sensor value of the detection data starts to fluctuate to some extent. Therefore, the host device 50 detects that the sensor value has fluctuated and notifies the wireless terminal 10 of a switching instruction.
Accordingly, in the period T2 in FIG. 12A, in response to the switching reception by the first terminal radio unit 14, the data processing unit 13 thereafter performs the same from the detection data, that is, all of the detection data, that is, similarly to the period T1. Extracted as target data to be wirelessly transmitted at a rate of once per time corresponding to the presence of fluctuation.

  Further, in response to receiving the switching instruction, the terminal control unit 16 selects the second terminal radio unit 15 and outputs the target data extracted by the data processing unit 13 to the second terminal radio unit 15. . Thereby, after the switching instruction, the target data extracted at a rate of once from the detected data is wirelessly transmitted to the access point 20 from the second terminal wireless unit 15 at the second communication speed. Is done.

In addition, when transmitting the target data extracted from the detected data at a rate of once, as shown in FIG. 12 (b), the individual target data is not individually transmitted wirelessly, but a plurality of them are collected. You may send in batch.
In this case, the terminal control unit 16 accumulates, for example, five pieces of target data extracted by the data processing unit 13 according to the detection result with fluctuation, and collects the data into one batch data, and the second terminal radio The unit 15 may wirelessly transmit to the access point 20.

[Effect of the sixth embodiment]
As described above, in the present embodiment, the data processing unit 13 extracts all detection data as target data in response to the switching instruction notified from the host device 50, and the terminal control unit 16 performs the switching. In response to the instruction, the second terminal radio unit 15 is selected to transmit the target data by radio.

  Thereby, after the change of the sensor value is detected in the host device 50, the wireless terminal 10 starts extracting all of the detection data as the target data, and the first terminal wireless unit 14 to the second terminal wireless device. Switching to the unit 15 is performed. Therefore, both the extraction switching of the target data and the usage period of the second terminal radio unit 15 can be appropriately switched according to the presence or absence of fluctuation on the host device 50 side, thereby realizing more efficient radio transmission control. It becomes possible to do.

[Extended embodiment]
The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. In addition, each embodiment can be implemented in any combination within a consistent range.

  DESCRIPTION OF SYMBOLS 1 ... Sensor network system, 10 ... Wireless terminal, 11 ... Sensor, 12 ... Data monitoring part, 13 ... Data processing part, 14 ... 1st terminal wireless part, 15 ... 2nd terminal wireless part, 16 ... Terminal control part , 17 ... terminal power supply unit, 20 ... access point, 21 ... first AP radio unit, 22 ... second AP radio unit, 23 ... AP control unit, 24 ... communication I / F unit, 25 ... AP power supply unit, 30 ... Relay device, 40 ... Communication network, 50 ... Host device.

Claims (9)

A wireless terminal that wirelessly transmits detection data detected by a sensor to an access point connected to a host device so that data communication is possible,
A first terminal wireless unit that performs wireless communication with a first communication performance;
A second terminal radio unit that performs radio communication with a second communication performance higher than the first communication performance;
A data monitoring unit that detects whether the sensor value varies by monitoring the sensor value of the detection data;
When the detection result indicates no variation, a part of the detection data is extracted as target data to be wirelessly transmitted, and when the detection result indicates variation, the detection data is the detection data. A data processor that extracts all of the
When the detection result indicates no variation, the first terminal radio unit is selected to wirelessly transmit the target data, and when the detection result indicates variation, the second terminal A terminal control unit that selects a wireless unit and wirelessly transmits the target data as the target data ;
In response to a notification of a switchback instruction from the host device, the access point, or a communication device connected between the host device and the access point, the data processing unit, A part shall be extracted,
The terminal control unit selects the first terminal radio unit and wirelessly transmits the target data in response to the notification of the switch back instruction . A wireless terminal that wirelessly transmits detection data detected by a sensor to an access point connected to a host device so that data communication is possible,
A first terminal wireless unit that performs wireless communication with a first communication performance;
A second terminal radio unit that performs radio communication with a second communication performance higher than the first communication performance;
A data monitoring unit that detects whether the sensor value varies by monitoring the sensor value of the detection data;
When the detection result indicates no variation, a part of the detection data is extracted as target data to be wirelessly transmitted, and when the detection result indicates variation, the detection data is the detection data. A data processor that extracts all of the
When the detection result indicates no variation, the first terminal radio unit is selected to wirelessly transmit the target data, and when the detection result indicates variation, the second terminal A terminal control unit that selects a wireless unit and wirelessly transmits the target data as the target data;
The terminal control unit selects the second terminal radio unit in response to a notification of a switching instruction from the host device, the access point, or a communication device connected between the host device and the access point. And the target data is wirelessly transmitted.
A wireless terminal characterized by that. The wireless terminal according to claim 1 ,
The terminal control unit selects the second terminal radio unit in response to a notification of a switching instruction from the host device, the access point, or a communication device connected between the host device and the access point. And wirelessly transmitting the target data. In the wireless terminal according to claim 2 or claim 3,
In response to a notification of a switching instruction from the host device, the access point, or a communication device connected between the host device and the access point, the data processing unit, A wireless terminal characterized in that it extracts. The wireless terminal according to claim 1 ,
The first terminal wireless unit includes a one-way wireless communication unit that performs only wireless transmission of the target data. In the radio | wireless terminal in any one of Claims 1-5,
The terminal control unit, when wirelessly transmitting the target data from the second terminal wireless unit, collectively transmits a plurality of the target data. The wireless terminal includes a host device, an access point connected to the host device via a relay device, and a wireless terminal that performs wireless communication with the access point, and the wireless terminal detects detection data detected by a sensor mounted on the wireless terminal. wherein wirelessly transmitting to the access point, a sensor network system for collecting by the host system via the relay device, said wireless terminal is a wireless terminal according to any one of claims 1 to 6 Sensor network system characterized by A wireless communication control method used in a wireless terminal that wirelessly transmits detection data detected by a sensor to an access point connected to a host device so that data communication is possible,
A first wireless communication step in which the first terminal wireless unit performs wireless communication with the first communication performance;
A second wireless communication step in which the second terminal wireless unit performs wireless communication with a second communication performance higher than the first communication performance;
A data monitoring step in which a data monitoring unit detects whether or not the sensor value fluctuates by monitoring the sensor value of the detection data;
When the data processing unit indicates that the detection result does not vary, a part of the detection data is extracted as target data to be wirelessly transmitted, and when the detection result indicates variation, the target A data processing step for extracting all of the detection data as data;
When the terminal control unit indicates that the detection result does not vary, the first wireless communication step is selected to wirelessly transmit the target data, and when the detection result indicates variation, A terminal control step of selecting the second wireless communication step and wirelessly transmitting it as the target data ,
The data processing step includes the detection data as the target data in response to a notification of a switchback instruction from the host device, the access point, or a communication device connected between the host device and the access point. A part shall be extracted,
In the wireless communication control method , the terminal control step selects the first wireless communication step and wirelessly transmits the target data in response to the notification of the switch back instruction . A wireless communication control method used in a wireless terminal that wirelessly transmits detection data detected by a sensor to an access point connected to a host device so that data communication is possible,
A first wireless communication step in which the first terminal wireless unit performs wireless communication with the first communication performance;
A second wireless communication step in which the second terminal wireless unit performs wireless communication with a second communication performance higher than the first communication performance;
A data monitoring step in which a data monitoring unit detects whether or not the sensor value fluctuates by monitoring the sensor value of the detection data;
When the data processing unit indicates that the detection result does not vary, a part of the detection data is extracted as target data to be wirelessly transmitted, and when the detection result indicates variation, the target A data processing step for extracting all of the detection data as data;
When the terminal control unit indicates that the detection result does not vary, the first wireless communication step is selected to wirelessly transmit the target data, and when the detection result indicates variation, A terminal control step of selecting the second wireless communication step and wirelessly transmitting it as the target data,
The terminal control step selects the second wireless communication step according to a notification of a switching instruction from the host device, the access point, or a communication device connected between the host device and the access point. And the target data is wirelessly transmitted.
A wireless communication control method.

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