JP5967521B2 - Communication network system, terminal device - Google Patents

Description

  The present invention relates to a communication network system that performs wireless communication using a frequency selected from a plurality of frequencies, and a terminal device used in the communication network system.

  Conventionally, a smart meter as a power meter having a function of connecting to a network is known (see, for example, Patent Document 1). The smart meter described in Patent Document 1 includes a power measuring unit (measuring device) that measures the amount of power of a device (mainly home appliance) connected to a power line, and receives data from the power measuring unit as a power amount receiving server. A transmission unit is provided. Furthermore, the smart meter has a function of transmitting and receiving data to and from a device called a HEMS (Home Energy Management System) that controls home appliances and obtains information from home appliances.

  The smart meter described in Patent Document 1 has a function of transmitting data to a power reception server via a public network such as the Internet. Moreover, HEMS described in patent document 1 cooperates with household appliances.

JP 2012-48576 A

  The smart meter described in Patent Document 1 communicates with the power reception server via a public network, but the communication path between the HEMS and the home appliance is not particularly described in Patent Document 1. .

  By the way, when installing a smart meter or HEMS, it is conceivable to use a wireless communication path in order to facilitate construction. However, since the wireless communication path may interfere, a countermeasure for suppressing the interference is required. . That is, when using a wireless communication path in a system that includes two types of communication networks having smart meters and HEMS as terminals, and a path in which the two terminals exchange data with each other, as in Patent Document 1, communication is performed. It is necessary to suppress interference between networks.

  The present invention provides a communication network system that suppresses interference between radio communication paths of different communication networks when two types of terminals that can communicate with each other constitute a communication network including the radio communication path, and this communication An object is to provide a terminal device used in a network system.

A communication network system according to the present invention is a communication network system including a first communication network including a wireless communication path and a plurality of second communication networks including a wireless communication path different from the wireless communication path, A first terminal communicating with another node belonging to the first communication network by using a wireless communication path included in the first communication network and a node belonging to the first communication network; with other nodes by using the wireless communication channel included in said second communication network a node belonging to the communication network belongs to the second communication network and a second terminal that communicates, the first The terminal and the second terminal communicate with each other using a communication path that does not belong to either the first communication network or the second communication network. Said second terminal, triggered a selection unit for selecting a frequency used in wireless communication path included in the second communication network to which the own terminal belongs, that from said first terminal has received the predetermined selection information And a determination unit that determines a frequency to be used in a wireless communication path included in the second communication network to which the terminal belongs and instructs the selection unit.

  In this communication network system, the first terminal acquires measurement data related to the amount of use of the resource from a measurement device installed in a consumer who uses the resource supplied from the resource supplier, and the acquired measurement data A meter reading function unit for notifying other nodes through the first communication network, the second communication network includes a device that uses the resource in the consumer in the node, and the second terminal It is preferable to include a management function unit that exchanges at least information regarding the use of the resource with the device that is a node of the second communication network.

  In this communication network system, the second terminal further includes a reporting unit that reports to the first terminal the frequency instructed by the determining unit to the selecting unit, and the reporting unit has the frequency selected by the selecting unit. It is preferable to have a function of notifying the first terminal of the frequency to be changed before changing.

  In this communication network system, the second terminal further includes a reporting unit that reports to the first terminal the frequency instructed by the determining unit to the selecting unit, and the reporting unit has the frequency selected by the selecting unit. It is preferable to have a function of notifying the first terminal of the changed frequency after the change.

In this communication network system, the first terminal selects the selection when the frequency reported from the second terminal is the same as the frequency used in the wireless communication path included in the first communication network. As information, it is preferable to further comprise a command notifying unit for notifying the second terminal of a command for instructing a frequency change.

  In this communication network system, the determination unit reports the selection unit to the first terminal when receiving the instruction to change the frequency from the first terminal as the selection information. It is preferable to have a function of instructing the selection unit to a frequency different from the frequency.

In this communication network system, the first terminal uses, as the selection information, a frequency used in a wireless communication path included in the first communication network, or another second communication network to which the terminal does not belong. It is preferable to provide a notification unit that notifies the second terminal of the frequency used in the included wireless communication path.

In this communication network system, the first communication network includes a plurality of the first terminals, and each of the first terminals can communicate with the second terminals belonging to different second communication networks. The first terminal uses a frequency used in a wireless communication path included in the second communication network to which the second terminal that can communicate with the other first terminal belongs. It is preferable that the information processing apparatus further includes an acquisition function unit configured to acquire through a communication network, and the notification unit has a function of notifying the second terminal capable of communication of the frequency acquired by the acquisition function unit as the selection information. .

In this communication network, the first terminal further includes a switching unit that switches a frequency used in a wireless communication path included in the first communication network, and the notification unit is configured to change the frequency before the switching unit changes the frequency. It is preferable to have a function of notifying the second terminal of the frequency to be changed.

In this communication network system, the first terminal further includes a switching unit that switches a frequency used in a wireless communication path included in the first communication network, and the notification unit is configured to change the frequency after the switching unit changes the frequency. It is preferable to have a function of notifying the second terminal of the changed frequency.

  In this communication network system, the determination unit has a function of instructing a frequency different from the frequency notified from the first terminal when receiving the frequency from the first terminal as the selection information. It is preferable to have.

  The terminal device according to the present invention is used in any of the communication network systems described above, and functions as the first terminal.

  Another terminal device according to the present invention is used in any of the communication network systems described above, and functions as the second terminal.

  According to the configuration of the present invention, the first terminal that is the node of the first communication network and the second terminal that is the node of the second communication network can communicate with each other, and the first communication network Since each of the second communication networks includes a wireless communication path, and the second terminal receives selection information from the first terminal, the frequency used in the second communication network is determined. It is possible to determine the frequency used in the wireless communication path between the first communication network and the second communication network so that mutual communication does not interfere.

It is a block diagram which shows embodiment. It is a figure which shows the example of the communication network system using the same as the above. It is operation | movement explanatory drawing which shows an example of transmission / reception of information with a sequence diagram in the same as the above. It is operation | movement explanatory drawing which shows the other example of information transfer in a sequence diagram same as the above. It is operation | movement explanatory drawing which shows another example of transmission / reception of information by a sequence diagram in the above.

  In the embodiment described below, a case where a resource supplier is an electric power company and electric power is supplied to a consumer as a resource will be described, but even when gas, water, heat, etc. are used as resources in addition to electric power Similar techniques can be applied. A meter as a measuring device for measuring the amount of resource used is installed in a consumer who is supplied with the resource. Note that the embodiments described below are not limited to the use of managing resource usage. That is, a communication network system including a plurality of different communication networks, and when each communication network system includes a wireless communication path, it can be applied regardless of use. The wireless communication path described below uses radio waves as a transmission medium.

  Here, since the resource is electric power, as shown in FIG. The measuring device 31 measures the amount of power used by the customer 1 per unit time, and outputs this amount of power as measurement data. Here, the measuring device 31 not only measures the amount of electric power supplied from the electric power company, but also has a function of measuring the amount of electric power created by the customer 1 when the customer 1 includes a power generation device. It may be. The measurement data is notified to the host device 40 through the first communication network NT1. Therefore, a terminal device (hereinafter referred to as “first terminal”) 10 that is a node belonging to the first communication network NT1 is attached to the measurement device 31.

  The 1st terminal 10 is provided with the meter-reading function part 11 (refer FIG. 1) which acquires the measurement data which the measuring device 31 output, and notifies the acquired measurement data to the high-order apparatus 40 through 1st communication network NT1. Although not described in detail, the nodes belonging to the first communication network NT1 can communicate by multi-hop communication. That is, the first terminal 10 is allowed to communicate with the host device 40 via the first terminal 10 attached to the power meter 30 installed in another consumer 1. Although the first communication network NT1 may include a wired communication path in addition to a wireless communication path, the first terminal 10 described below uses the wireless communication path in the first communication network NT1.

  The host device 40 is assumed to be a management server operated by an electric power company or a service provider entrusted by the electric power company. The host device 40 may be realized by a plurality of computers instead of a single computer. Further, the host device 40 may construct a communication network that is hierarchized into a plurality of hierarchies. For example, the communication network may be constructed such that the management server communicates with a plurality of relay devices, and each relay device communicates with the plurality of first terminals 10. That is, the host device 40 may include a management server and a plurality of relay devices, and the relay device belonging to the same first communication network NT1 and the first terminal 10 may communicate with each other. In this case, a plurality of types of transmission media may be used for the communication network constructed by the host device 40.

  By the way, the consumer 1 is equipped with the electric equipment 50 which is an apparatus which uses the electric power as a resource. In addition to the electric device 50 that consumes electric power, the electric device 50 may include a power generation device (solar power generation device, wind power generation device, fuel cell, etc.) that generates electric power, and a power storage device that charges and discharges electric power. The electric device 50 may include a measurement unit that measures the amount of power passing through the main circuit or branch circuit of the distribution board. At least some of these electric devices 50 become nodes belonging to the second communication network NT2 constructed in the customer 1.

  The second communication network NT2 includes a terminal device (hereinafter referred to as “second terminal”) 20 that performs communication with the electrical device 50 as a node. The second terminal 20 includes a management function unit 21 (see FIG. 1) that exchanges at least information regarding the use of power by the electric device 50 with the electric device 50. In addition, the second terminal 20 not only collects information on power input / output in the electric device 50 but also has a function of monitoring the operation of the electric device 50 and a function of instructing the operation of the electric device 50 as necessary. It is desirable to have. That is, the second terminal 20 desirably has a function as a management device in a so-called HEMS (Home Energy Management System).

  Similarly to the first communication network NT1, the second communication network NT2 may include a wired communication path in addition to a wireless communication path. However, the following description will focus on the wireless communication path. That is, the second terminal 20 can communicate with the electrical device 50 using a wired communication path in addition to a wireless communication path, but a case where communication is performed using the wireless communication path will be described below.

  The first terminal 10 and the second terminal 20 communicate using a communication path CL that does not belong to either the first communication network NT1 or the second communication network NT2. The communication path CL may be either a wireless communication path or a wired communication path. When a wired communication path is employed as the communication path CL, it is desirable to perform power line carrier communication that uses the distribution line that supplies power to the customer 1 as the communication path CL. Between the first terminal 10 and the second terminal 20, the amount of power acquired by the first terminal 10, the reduction target of the amount of power notified from the upper device 40 to the first terminal 10, the first terminal 10 and the second terminal 20 communicate information such as information to be shared.

  As shown in FIG. 1, the first terminal 10 and the second terminal 20 each perform wireless communication. As shown in FIG. 1, a communication interface unit (hereinafter abbreviated as “communication I / F”) 15 for wireless communication is used. , 25. In addition, communication I / Fs 16 and 26 for performing communication between the first terminal 10 and the second terminal 20 through the communication path CL are provided. Each of the first terminal 10 and the second terminal 20 includes a device that operates according to a program, such as a microcomputer, and communication circuits that constitute the communication I / Fs 15, 16, 25, and 26 as main hardware configurations. Yes.

  As described above, the first terminal 10 which is a node belonging to the first communication network NT1 is attached to each power meter 30, and the second terminal 20 which is a node belonging to the second communication network NT2 is an electric device 50. Communicate with. That is, a plurality of second communication networks NT2 are provided for the first communication network NT1.

  In FIG. 2, the wireless communication path is indicated by a broken line, and frequencies f1, f2, and f3 used in the wireless communication path are added. Here, different channels of wireless communication paths are formed for each of the frequencies f1, f2, and f3. The first terminal 10 and the second terminal 20 include, for example, channels obtained by dividing dozens of frequency bands of 2.4 GHz band and 920 MHz band, and channels (that is, frequencies) used for communication from these channels. It has a function to select.

  The frequency used in the first communication network NT1 is notified from the host device 40 to the first terminal 10. The first terminal 10 selects a frequency instructed by the host device 40 and uses the selected frequency in communication performed through the first communication network NT1. On the other hand, the second terminal 20 determines the frequency used in the second communication network NT2. The second terminal 20 exchanges information with the first terminal 10 and determines the frequency so that communication performed on the second communication network NT2 does not coincide with communication on other communication networks. Below, the technique in which the 2nd terminal 20 determines a frequency is demonstrated concretely.

  As shown in FIG. 1B, the second terminal 20 determines a frequency used in the second communication network NT2 and a selection unit 22 that selects a frequency used in the second communication network NT2 to which the terminal belongs. And a determination unit 23 that instructs the selection unit 22 on the frequency. The determination unit 23 determines a frequency to be used in the second communication network NT2 when receiving selection information from the first terminal 10 through the communication path CL.

  As the selection information notified from the first terminal 10 to the second terminal 20, either information on the frequency or a command for instructing the change of the frequency is used. When the selection information is information regarding the frequency, the selection information is used to notify the frequency used in the first communication network NT1. Alternatively, the selection information is used for notifying the frequency used by the other customer 1 in the second communication network NT2 in addition to the frequency used in the first communication network NT1.

  The second terminal 20 also includes a report unit 24 that reports the frequency that the determination unit 23 instructs the selection unit 22 to the first terminal 10. The reporting unit 24 has a function of reporting the frequency to be changed to the first terminal 10 before the selection unit 22 changes the frequency, or changes to the first terminal 10 after the selection unit 22 changes the frequency. It has a function to report a later frequency.

  As shown in FIG. 3, when the selection information is notified from the first terminal 10 to the second terminal 20 (P21), the determination unit 23 of the second terminal 20 determines the frequency to be used in the second communication network NT2. (P22). The frequency determined by the determination unit 23 is notified to the selection unit 22, and this frequency is used for communication in the second communication network NT2 (P24). The reporting unit 24 reports the frequency used in the second communication network NT2 to the first terminal 10.

  The timing at which the reporting unit 24 reports the frequency to the first terminal 10 is before the frequency is notified from the determining unit 23 to the selecting unit 22 after the determining unit 23 determines the frequency (P23). That is, since the frequency determined by the second terminal 20 is reported to the first terminal 10 before being used in the second communication network NT2, the frequency can be easily changed without affecting other communication networks. . In addition, before actually selecting a frequency, it is possible to inquire the first terminal 10 as to whether or not the frequency can be used, and the usable frequency in relation to the first terminal 10 can be determined in a short time. It becomes possible to determine.

  The timing at which the report unit 24 reports the frequency to the first terminal 10 may be after the frequency is notified from the determination unit 23 to the selection unit 22 (P25). At this timing, even if the frequency determined by the determination unit 23 is used by the selection unit 22 and inconvenience occurs and the frequency is changed by the determination unit 23, the result is reported to the first terminal 10. The frequency used in the second communication network NT2 is accurately reported to the first terminal 10. Note that the timing at which the reporting unit 24 reports the frequency to the first terminal 10 may be the same as the timing at which the determination unit 23 notifies the selection unit 22 of the frequency.

  As described above, the determination unit 23 determines the frequency used in the second communication network NT2 when the second terminal 20 receives the selection information from the first terminal 10 as described above. On the other hand, as shown in FIG. 1A, the first terminal 10 includes a switching unit 12 that switches the frequency used for communication in the first communication network NT1 to the frequency required through the first communication network NT1. Prepare. The first terminal 10 also includes a notification unit 14 for notifying the second terminal 20 of the frequency used in the first communication network NT1.

  In the same way as the reporting unit 24 in the second terminal 20, the notification unit 14 uses the second terminal at a timing either before or after the switching unit 12 changes the frequency used in the first communication network NT1. 20 is notified of the frequency. That is, as shown in FIG. 4, when the first terminal 10 is instructed to switch the frequency through the first communication network NT1 (P11), the switching unit 12 of the first terminal 10 changes the frequency (P12). ). When the frequency is changed, the notification unit 14 notifies the second terminal 20 of the changed frequency (P13). In this case, since the frequency actually used in the first communication network NT1 is notified to the second terminal 20, basically only the notification from the first terminal 10 to the second terminal 20 is performed once. The frequency used in the second communication network NT2 is determined.

  On the other hand, the timing at which the notification unit 14 notifies the frequency to the second terminal 20 may be before the first terminal 10 changes to the frequency requested to switch the frequency from the first communication network NT1 (P14). ). The timing at which the notification unit 14 notifies the second terminal 20 of the frequency may be either before or after the switching unit 12 changes the frequency. Also in this case, the timing at which the notification unit 14 notifies the frequency to the second terminal 20 may be the same as the timing at which the switching unit 12 switches the frequency.

Below, the technique which determines the frequency which the 2nd terminal 20 uses by 2nd communication network NT2 by exchanging information between the 1st terminal 10 and the 2nd terminal 20 is demonstrated. In the present embodiment, a plurality of second communication networks NT2 are connected to the first communication network NT1, and the frequency used by the first communication network NT1 is notified from the host device 40. Therefore, the frequency used in the first communication network NT1 cannot basically be changed. Therefore, the basic policy is to change the frequency in the selection unit 22 of the second terminal 20 in order to prevent interference with other communication networks in the second communication network NT2.

  The selection information transmitted from the first terminal 10 to the second terminal 20 includes two types of information, that is, information relating to the frequency and a command for instructing the change of the frequency. Although the selection information transmitted from the first terminal 10 to the second terminal 20 may be only one of two types of information, in the present embodiment, the first terminal 10 has two types of information. As an example, a case will be described in which these are properly used as necessary.

  As shown in FIG. 4, when the frequency used in the first communication network NT1 is notified to the first terminal 10, the switching unit 12 sets the frequency used in the first communication network NT1 to the notified frequency. change. Here, the notification of the frequency is notified using, for example, a frequency reserved for control. The notification unit 14 notifies the second terminal 20 of the frequency changed by the switching unit 12 through the communication path CL.

  The second terminal 20 includes a determination unit 23 that determines a frequency used in the second communication network NT2 when a frequency used in the first communication network NT1 is notified from the first terminal 10. In this case, the determination unit 23 determines a frequency to be used in the second communication network NT2 so that communication in the second communication network NT2 does not interfere with communication in the first communication network NT1. Specifically, the determination unit 23 has a function of determining a frequency different from the frequency notified from the first terminal 10.

  The operation described above allows the second terminal 20 to determine the frequency used in the second communication network NT2 so as not to overlap with the frequency used in the first communication network NT1.

  Incidentally, as shown in FIG. 2, since there are a plurality of second communication networks NT2 with respect to the first communication network NT1, there is a possibility that interference occurs between the second communication networks NT2. In the above-described operation, attention is paid only to the frequency of the first communication network NT1 and the second communication network NT2, but it is desirable to consider the frequency relationship between the second communication networks NT2.

  For this reason, the first terminal 10 communicates with the other first terminal 10 through the first communication network NT1, thereby using the frequency used by the second terminal 20 that can communicate with the other first terminal 10. It is desirable to provide an acquisition function unit 17 for acquiring The acquisition function unit 17 acquires a frequency used by a plurality of second communication networks NT2 connected to the first communication network NT1. Actually, if the distance between the different second communication networks NT2 is large, they do not interfere with each other. Therefore, the acquisition function unit 17 can acquire the frequency for the second communication network NT2 located at a relatively short distance. desirable. In the present embodiment, since the first terminal 10 supports multi-hop notification, for example, the first terminal 10 may be limited to about 1 to 3 hops depending on the number of hops.

  Since the frequency acquired by the acquisition function unit 17 is a frequency used by the other second communication network NT2, when the frequency is notified to the second terminal 20 through the notification unit 14, the determination in the second terminal 20 is made. The unit 23 can select a frequency different from the notified frequency.

  On the other hand, a command instructing the first terminal 10 to change the frequency to the second terminal 20 is notified by the command notification unit 13 provided in the first terminal 10 through the communication path CL. The event in which the command notifying unit 13 notifies the second terminal 20 of a command to change the frequency as selection information is mainly the frequency used from the second terminal 20 to the first terminal 10 in the second communication network NT2. Is triggered by the fact that is reported. That is, when the frequency reported from the second terminal 20 to the first terminal 10 is a frequency that interferes with the communication of the first communication network NT1, in order to avoid this frequency, the first terminal 10 The second terminal 20 is requested to change the frequency.

  Therefore, the command notification unit 13 may instruct the frequency change not only when the frequency reported from the second terminal 20 matches the first communication network NT1, but also by evaluating the degree of interference.

  In this case, as shown in FIG. 5, the first terminal 10 transmits a command to instruct frequency change to the second terminal 20 (P31). The determination unit 23 of the second terminal 20 appropriately determines the frequency used in the second communication network NT2 (P32), and the frequency determined by the determination unit 23 is notified to the first terminal 10 through the report unit 24. (P33). In the illustrated example, after the frequency is reported to the first terminal 10, the determination unit 23 notifies the selection unit 22 of the frequency (P34). At this stage, the selection unit 22 may not be notified of the frequency. .

  When the instruction notification unit 13 of the first terminal 10 receives the frequency from the second terminal 20, the instruction notification unit 13 compares the received frequency with the frequency used in the first communication network NT1, and evaluates that interference occurs. (P35), a command to change the frequency is transmitted again (P36). Thereafter, the same operation as P32 to P34 described above is repeated (P37 to P39). When the instruction notification unit 13 determines that the frequency reported from the second terminal 20 does not interfere with the frequency used in the first communication network NT1, the instruction notification unit 13 notifies the second terminal 20 of acceptance ( P40). However, the determination unit 23 instructs the selection unit 22 to use a frequency different from the frequency reported to the first terminal 10 through the report unit 24. When the second terminal 20 receives the notification of acceptance, the second terminal 20 sets the frequency determined by the determination unit 23 as the frequency used in the second communication network NT2.

  As an example in which the command notification unit 13 instructs the second terminal 20 to change the frequency, the case where the communication of the second communication network NT2 interferes with the communication of the first communication network NT1 has been described. The same technique can be adopted when interfering with communication of the communication network NT2.

  The above-described configuration example mainly assumes a detached house. However, when a plurality of consumers exist in one building such as an apartment house or an office building, the first communication network NT1 is included in the building. You may use a wired communication path for a part. In this case, it is desirable to employ a power line carrier communication technique that uses a distribution line as a communication path. That is, a distribution line is used as a communication path connecting the first terminals 10 in the building.

  In the present embodiment, the technology for distinguishing the channels used in the first communication network NT1 and the second communication network NT2 by frequency has been described. The channel used for communication can also be secured by changing the communication time. That is, interference can be prevented by making the timing at which the first communication network NT1 performs communication different from the timing at which the second communication network NT2 performs communication. In this case, it is conceivable that the time slot used by the first communication network NT1 and the time slot used by the second communication network NT2 are provided separately.

  Even when a channel is secured by changing the timing of communication, communication is performed between the first terminal 10 and the second terminal 20 in the same manner as in the technique of dividing the channel by frequency, and the second terminal 20 A technique using a channel different from that of the first terminal 10 can be adopted. For example, when the first terminal 10 notifies the second terminal 20 that communication is to be performed, the second terminal 20 may be configured not to perform communication for a certain period of time. Similarly, the timing at which the other second communication network NT2 performs communication may be collected, and communication in the second communication network NT2 may be performed at a timing that avoids the collected timing.

  By the way, as for the 1st terminal 10 attached to the electric power meter 30, the time limit is prescribed | regulated to the total time which communicates about unit time. For example, the total time for which one first terminal 10 communicates with one hour as a unit time is limited to 360 seconds or the like. Therefore, if the total time that the first terminal 10 communicates in the unit time is measured, it can be understood that the first terminal 10 that has reached the time limit does not communicate until the end of the unit time. . Utilizing this fact, the communication by the second terminal 20 may be performed during a time period when the first terminal 10 does not perform communication.

  In the configuration example described above, communication using a wireless communication path has been mainly described. However, both the first communication network NT1 and the second communication network NT2 include both a wireless communication path and a wired communication path. May be. In addition, when a wireless communication path and a wired communication path are used in combination, it is possible to use a wired communication path in a communication section where the wireless communication path is not used.

DESCRIPTION OF SYMBOLS 1 Consumer 10 1st terminal 11 Meter-reading function part 12 Switching part 13 Command notification part 14 Notification part 15 Communication interface part 16 Communication interface part 17 Acquisition function part 20 2nd terminal 21 Management function part 22 Selection part 23 Determination part 24 Report unit 25 Communication interface unit 26 Communication interface unit 31 Measuring device NT1 First communication network NT2 Second communication network

Claims (13)

A communication network system comprising a first communication network including a wireless communication path and a plurality of second communication networks including a wireless communication path different from the wireless communication path,
A first terminal communicating with another node belonging to the first communication network using a wireless communication path included in the first communication network, the node belonging to the first communication network ;
A node belonging to the second communication network and a second terminal that communicates with another node belonging to the second communication network using a wireless communication path included in the second communication network ;
The first terminal and the second terminal communicate using a communication path that does not belong to any of the first communication network and the second communication network,
The second terminal is
A selection unit for selecting a frequency used in a wireless communication path included in the second communication network to which the terminal belongs;
Triggered by receiving predetermined selection information from the first terminal, a determination unit that determines a frequency to be used in a wireless communication path included in the second communication network to which the terminal belongs and instructs the selection unit A communication network system characterized by comprising: The first terminal acquires measurement data relating to the usage amount of the resource from a measurement device installed in a consumer who uses a resource supplied from a resource supplier, and uses the acquired measurement data as the first communication. It has a meter reading function that notifies other nodes through the network.
The second communication network includes, in a node, a device that uses the resource in the consumer,
2. The communication network according to claim 1, wherein the second terminal includes a management function unit that exchanges at least information on the use of the resource with the device that is a node of the second communication network. system. The second terminal further includes a report unit that reports to the first terminal the frequency that the determination unit instructs the selection unit;
The communication network system according to claim 1 or 2, wherein the reporting unit has a function of notifying the first terminal of a frequency to be changed before the selecting unit changes the frequency. The second terminal further includes a report unit that reports to the first terminal the frequency that the determination unit instructs the selection unit;
The communication network system according to claim 1 or 2 , wherein the reporting unit has a function of notifying the first terminal of the changed frequency after the selection unit has changed the frequency. When the frequency reported from the second terminal is the same as the frequency used in the wireless communication path included in the first communication network , the first terminal changes the frequency as the selection information. The communication network system according to claim 3, further comprising a command notifying unit that notifies the second terminal of a command for instructing the user. The determination unit receives a frequency that is different from the frequency reported to the first terminal by the reporting unit when the instruction to change the frequency is received from the first terminal as the selection information. The communication network system according to claim 5, having a function of instructing the selection unit. The first terminal uses, as the selection information, a frequency used in a wireless communication path included in the first communication network, or a wireless communication path included in another second communication network to which the terminal does not belong. The communication network system according to claim 1, further comprising a notification unit that notifies the second terminal of a frequency to be used. The first communication network includes a plurality of the first terminals, and each of the first terminals can communicate with the second terminal belonging to a different second communication network,
The first terminal uses a frequency used in a wireless communication path included in the second communication network to which the second terminal to which the second terminal that can communicate with the other first terminal belongs belongs to the first communication network. It further includes an acquisition function unit that acquires through
The communication network system according to claim 7, wherein the notification unit has a function of notifying the second terminal capable of communication of the frequency acquired by the acquisition function unit as the selection information. The first terminal further includes a switching unit that switches a frequency used in a wireless communication path included in the first communication network,
The communication network system according to claim 7, wherein the notification unit has a function of notifying the second terminal of a frequency to be changed before the switching unit changes the frequency. The first terminal further includes a switching unit that switches a frequency used in a wireless communication path included in the first communication network,
The communication network system according to claim 7, wherein the notification unit has a function of notifying the second terminal of the changed frequency after the switching unit has changed the frequency. The determination unit has a function of instructing a frequency different from the frequency notified from the first terminal when receiving the frequency from the first terminal as the selection information. The communication network system according to any one of claims 7 to 10.   A terminal device that is used in the communication network system according to any one of claims 1 to 11 and functions as the first terminal.   A terminal device that is used in the communication network system according to any one of claims 1 to 11 and functions as the second terminal.

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