JP6795130B1 - Communication system, communication device and communication control method - Google Patents

Abstract

A communication system used in a power system, comprising a plurality of communication devices for transferring a packet including identification information of a transfer destination by wireless communication, and the communication device transmits a specific packet which is the packet including a specific type information. When the specific packet is received regardless of the identification information, a discard process for discarding the packet containing type information different from the specific packet is performed for a predetermined period, and the communication device at the transfer destination receives the packet. The specific packet is transferred by wireless communication including the identification information of another transfer destination.

Description

The present disclosure relates to communication systems, communication devices and communication control methods.
This application claims priority on the basis of Japanese Application Japanese Patent Application No. 2019-128527 filed on July 10, 2019, and incorporates all of its disclosures herein.

As an example of the network system, for example, Japanese Patent Application Laid-Open No. 2014-121243 (Patent Document 1) discloses the following configuration.

That is, in the network system, a radio station is installed in each tower of the tower row in which the transmission line is erected, and at least one of the radio stations is connected to a master station that can be connected to an external communication line to connect these radio stations. Therefore, information can be sequentially relayed in both directions from the radio station to the master station or from the master station to the radio station along the tower row, and the radio station can be relayed from one side of the tower row. The first communication includes a first communication memory for storing the transmitted information and a second communication memory for storing the information sent from the other side of the tower row. In a power transmission tower maintenance information radio network system that relays the information stored in the memory to the other side and relays the information stored in the second communication memory to the one side, the radio station has An identification number is individually assigned, and the radio station that is the source of the information transmits the information with the identification number of its own station, and the master station identifies the radio station. It has an identification number conversion table that associates the numbers with the tower numbers assigned to the tower where the radio station is installed, and a plurality of transmission lines are laid side by side on the tower, and they are the same. A plurality of the tower numbers corresponding to each transmission line are assigned to the iron tower, and the master station assigns the identification number of the radio station that transmitted the information based on the identification number conversion table to each transmission line. It is converted into a plurality of the tower numbers corresponding to. The master station communicates with a higher-level host station via an external communication line such as a mobile phone line.

Japanese Unexamined Patent Publication No. 2014-121243

The communication system of the present disclosure is a communication system used in a power system, and includes a plurality of communication devices that transfer packets including transfer destination identification information by wireless communication, and the communication device includes specific type information. When a specific packet, which is the packet, is received regardless of the identification information, and the specific packet is received, a discard process for discarding the packet containing type information different from the specific packet is performed for a predetermined period, and the transfer destination is described. The communication device transfers the received specific packet by wireless communication including identification information of another transfer destination.

The communication device of the present disclosure is a communication device in a communication system used for a power system, and includes a communication unit that performs wireless communication and a communication control unit that transfers a packet containing identification information of a transfer destination via the communication unit. The communication control unit receives the specific packet, which is the packet containing the specific type information, via the communication unit regardless of the identification information, and when the specific packet is received, the specific packet is received for a predetermined period. When the specific packet includes the identification information of its own communication device, the communication control unit performs a discard process for discarding the packet containing different types of information from the above, and the received specific packet is sent to another transfer destination. The identification information is transferred via the communication unit.

The communication control method of the present disclosure is a communication control method in a communication system used for a power system, and the communication system includes a plurality of communication devices for wirelessly transferring a packet including identification information of a transfer destination. A step in which the communication device receives a specific packet, which is the packet containing the specific type information, regardless of the identification information, and discards the packet containing the type information different from the specific packet for a predetermined period. , The step of the communication device of the transfer destination includes the identification information of another transfer destination in the received specific packet and transfers the packet by wireless communication.

The communication control method of the present disclosure is a communication control method in a communication device including a communication unit that performs wireless communication in a communication system used for a power system, and a packet containing identification information of a transfer destination is transmitted via the communication unit. When a specific packet, which is a packet containing specific type information, is received via the communication unit regardless of the identification information, and the specific packet is received, a type different from the specific packet is received for a predetermined period. When the specific packet includes the identification information of its own communication device, the communication unit includes the identification information of another transfer destination in the received specific packet and the step of performing the discard process of discarding the packet containing the information. Includes steps to transfer via.

One aspect of the present disclosure can be realized not only as a communication system including such a characteristic processing unit, but also as a program for causing a computer to execute such a characteristic processing step. Further, one aspect of the present disclosure can be realized as a semiconductor integrated circuit that realizes a part or all of a communication system.

One aspect of the present disclosure can be realized not only as a communication device provided with such a characteristic processing unit, but also as a program for causing a computer to execute such a characteristic processing step. Further, one aspect of the present disclosure can be realized as a semiconductor integrated circuit that realizes a part or all of a communication device.

FIG. 1 is a diagram showing a configuration of a communication system according to an embodiment of the present disclosure. FIG. 2 is a diagram showing an application example of the communication system according to the embodiment of the present disclosure. FIG. 3 is a diagram showing an example of address allocation in the communication system according to the embodiment of the present disclosure. FIG. 4 is a diagram showing an example of a configuration of a communication device in the communication system according to the embodiment of the present disclosure. FIG. 5 is a diagram showing an example of a packet used in the communication system according to the embodiment of the present disclosure. FIG. 6 is a diagram showing an example of a packet used in the communication system according to the embodiment of the present disclosure. FIG. 7 is a diagram showing an example of a configuration of a parent device in the communication system according to the embodiment of the present disclosure. FIG. 8 is a diagram showing an example of a specific packet used in the communication system according to the embodiment of the present disclosure. FIG. 9 is a diagram showing a sequence of discard processing in the communication system according to the embodiment of the present disclosure. FIG. 10 is a diagram showing a sequence of discard processing in the communication system according to the embodiment of the present disclosure. FIG. 11 is a flowchart defining an operation procedure in a normal state of the communication device according to the embodiment of the present disclosure. FIG. 12 is a flowchart defining an operation procedure in a specific control state of the communication device according to the embodiment of the present disclosure. FIG. 13 is a flowchart defining an operation procedure in a normal state of the parent device according to the embodiment of the present disclosure. FIG. 14 is a flowchart defining an operation procedure in a specific control state of the parent device according to the embodiment of the present disclosure.

[Issues to be solved by this disclosure]
In a network system as described above, when the bandwidth occupancy of the transmission route is high, the loss of packets including various information to be transmitted is likely to occur, and it becomes difficult to stably transmit the information. ..

The present disclosure has been made to solve the above-mentioned problems, and an object thereof is a communication system capable of stably transmitting specific information in a communication system in which various information is transferred between communication devices. , Communication devices and communication control methods.

[Effect of the present disclosure]
According to the present disclosure, specific information can be stably transmitted in a communication system in which various types of information are transferred between communication devices.

[Explanation of Embodiments of the Invention]
First, the contents of the embodiments of the present disclosure will be listed and described.

(1) The communication system according to the embodiment of the present disclosure is a communication system used for a power system, and includes a plurality of communication devices for transferring packets including transfer destination identification information by wireless communication. Receives a specific packet that is the packet containing the specific type information regardless of the identification information, and when the specific packet is received, discards the packet containing the type information different from the specific packet for a predetermined period. The discard process is performed, and the communication device at the transfer destination transfers the received specific packet by wireless communication including the identification information of the other transfer destination.

In this way, the communication device wirelessly transmits the specific packet, and the communication device that is not the next transfer destination of the specific packet receives the specific packet and starts the discard process, so that the communication device other than the next transfer destination of the specific packet is started. In, the traffic and the processing load can be reduced prior to the reception of the specific packet to be transferred. This makes it possible to more reliably transmit a specific packet in the communication system. Therefore, in a communication system in which various types of information are transferred between communication devices, specific information can be stably transmitted.

(2) Preferably, the obtained sensor is provided in the electric power system, the communication apparatus, when the measurement result of the sensor is abnormal, and generates the specific packet including the information based on the measurement result or the measurement result When the measurement result is normal, the communication device generates the packet including the measurement result or information based on the measurement result, which is a packet containing type information different from the specific packet. And transfer.

With such a configuration, when there is an abnormality in the measurement result in the power system, the abnormality and the abnormal value can be notified more reliably.

(3) More preferably, the communication device discards the packet that contains type information different from the specific packet and is generated in the predetermined period, and the specific packet generated in the predetermined period. Transfer without discarding.

With such a configuration, for example, in a situation where a specific packet is transmitted from another communication device, the specific packet generated by the own communication device can also be transmitted in parallel.

(4) Preferably, the communication system further includes a parent device that relays information between at least one of the plurality of communication devices and another device, and the parent device is the specific packet. Is received regardless of the identification information of the transfer destination, and when the specific packet that does not include the identification information of its own is received, a discard process that discards the packet containing type information different from the specific packet is performed for a predetermined period. Do.

With such a configuration, for example, in a communication system in which a parent device relays information from another device to a child device, the traffic and processing load on the parent device can be reduced prior to receiving a specific packet to be transferred. It is possible to make the transmission of a specific packet more reliable.

(5) The communication device according to the embodiment of the present disclosure is a communication device in a communication system used for a power system, and a communication unit that performs wireless communication and a packet containing identification information of a transfer destination are used in the communication unit. The communication control unit includes a communication control unit that transfers via the communication control unit, and the communication control unit receives a specific packet that is the packet containing specific type information via the communication unit regardless of the identification information, and receives the specific packet. In this case, a discarding process is performed for a predetermined period to discard the packet containing information of a type different from that of the specific packet, and the communication control unit receives the packet when the specific packet includes identification information of its own communication device. The specific packet includes the identification information of another transfer destination and is transferred via the communication unit.

In this way, the communication device wirelessly transmits the specific packet, and the communication device that is not the next transfer destination of the specific packet receives the specific packet and starts the discard process, so that the communication device other than the next transfer destination of the specific packet is started. In, the traffic and the processing load can be reduced prior to the reception of the specific packet to be transferred. This makes it possible to more reliably transmit a specific packet in the communication system. Therefore, in a communication system in which various types of information are transferred between communication devices, specific information can be stably transmitted.

(6) The communication control method according to the embodiment of the present disclosure is a communication control method in a communication system used in a power system, and the communication system transfers a packet including identification information of a transfer destination by wireless communication. A plurality of communication devices are provided, and the communication device receives a specific packet which is the packet containing the specific type information regardless of the identification information, and for a predetermined period of time, the packet containing the type information different from the specific packet is received. It includes a step of performing a discarding process of discarding, and a step of the communication device of the forwarding destination transferring the received specific packet by wireless communication including identification information of another forwarding destination.

In this way, the communication device wirelessly transmits the specific packet, and the communication device that is not the next transfer destination of the specific packet receives the specific packet and starts the discard process, so that the communication device other than the next transfer destination of the specific packet is started. In, the traffic and the processing load can be reduced prior to the reception of the specific packet to be transferred. This makes it possible to more reliably transmit a specific packet in the communication system. Therefore, in a communication system in which various types of information are transferred between communication devices, specific information can be stably transmitted.

(7) The communication control method according to the embodiment of the present disclosure is a communication control method in a communication device including a communication unit that performs wireless communication in a communication system used for a power system, and includes identification information of a transfer destination. When a step of transferring a packet via the communication unit and a specific packet which is the packet containing specific type information are received via the communication unit regardless of the identification information and the specific packet is received, a predetermined period of time , A step of performing a discarding process of discarding the packet containing information of a type different from that of the specific packet, and when the specific packet includes identification information of its own communication device, the received specific packet of another transfer destination The step including the step of transferring the identification information via the communication unit is included.

In this way, the communication device wirelessly transmits the specific packet, and the communication device that is not the next transfer destination of the specific packet receives the specific packet and starts the discard process, so that the communication device other than the next transfer destination of the specific packet is started. In, the traffic and the processing load can be reduced prior to the reception of the specific packet to be transferred. This makes it possible to more reliably transmit a specific packet in the communication system. Therefore, in a communication system in which various types of information are transferred between communication devices, specific information can be stably transmitted.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and the description thereof will not be repeated. In addition, at least a part of the embodiments described below may be arbitrarily combined.

[Configuration and basic operation]
FIG. 1 is a diagram showing a configuration of a communication system according to an embodiment of the present disclosure.

With reference to FIG. 1, the communication system 301 includes a plurality of communication devices 101, a parent device 102, an aggregation device 151, and a host device 171. In FIG. 1, the communication system 301 shows one monitoring system T1.

Communication system 301 is used in the power system. More specifically, the communication system 301 is, for example, a communication system installed in a power transmission facility installed between a power plant and a consumer of electric power, for example, measurement of current flowing through a power transmission line, voltage of the power transmission line. It is used for measurement of power transmission lines, temperature monitoring of power transmission lines, and maintenance of power transmission equipment. The power system is provided with, for example, a sensor.

The communication device 101 and the parent device 102 have a function of transferring information by performing multi-hop communication. As used herein, "transfer" includes, for example, relaying information to a relay destination and transmitting information as a source of information to the relay destination.

Specifically, as a "transfer", the communication device 101 uses, for example, another communication device 101 or a parent device that is different from the other communication device 101 in that it receives information received from the other communication device 101 or the parent device 102. It transmits to 102, and also transmits information indicating the measurement result of the sensor by itself to another communication device 101 or the parent device 102.

Further, as "transfer", the parent device 102 receives, for example, the information transferred from the communication device 101 located at the end of the plurality of communication devices 101 in the communication system 301, transmits the information to the aggregation device 151, and self. Transmits the information received from the aggregation device 151 to the communication device 101 located at the end thereof, and also transmits the information indicating the measurement result of the sensor by itself to the aggregation device 151. The parent device 102 is not limited to the communication device 101 located at the end of the plurality of communication devices 101, but receives the information transferred from any one of the plurality of communication devices 101 and transmits the information to the aggregation device 151. Further, the information received from the aggregation device 151 may be transferred to any one of the plurality of communication devices 101.

FIG. 2 is a diagram showing an application example of the communication system according to the embodiment of the present disclosure. With reference to FIGS. 1 and 2, the aggregation device 151 is provided, for example, in a steel tower 2.

The electric wires 1U, 1V, and 1W are U-phase, V-phase, and W-phase electric wires in the power system, respectively, and are supported by a plurality of steel towers 2. One line 3 is composed of electric wires 1U, 1V, and 1W. Although one line 3 is typically shown in FIG. 2, a plurality of lines 3 may be provided. Hereinafter, each of the electric wires 1U, 1V, and 1W is also referred to as an electric wire 1.

The communication device 101 is provided at positions corresponding to each other, for example, in the multi-phase electric wires 1. More specifically, the three communication devices 101 are provided, for example, at positions near the steel tower 2 in each of the electric wires 1U, 1V, and 1W. The distances between these three communication devices 101 and the tower 2 are, for example, the same.

Further, the two communication devices 101 and the parent device 102 are provided at positions corresponding to each other on the multi-phase electric wire 1. More specifically, the parent device 102 is provided, for example, at a position near the steel tower 2 on the electric wire 1U. The two communication devices 101 are provided, for example, at positions near the steel tower 2 on each of the electric wires 1V and 1W. The distances between these two communication devices 101 and the parent device 102 and the tower 2 are, for example, the same.

The communication device 101 and the parent device 102 are devices having a wireless communication function. The communication device 101 and the parent device 102 perform wireless communication using, for example, a communication band of the 920 MHz band.

The communication device 101 is configured to be provided on the electric wires 1U, 1V, and 1W, respectively, but the present invention is not limited to this, and the communication device 101 may be provided on a part of the electric wires 1U, 1V, and 1W.

Further, the parent device 102 is configured to be provided on the electric wire 1U, but the present invention is not limited to this, and the parent device 102 may be provided on the electric wire 1V or the electric wire 1W.

The parent device 102 is connected to, for example, the aggregation device 151 by a serial cable, receives the information transmitted from the communication device 101, and transfers the received information to the aggregation device 151.

The host device 171 is a device capable of communicating with the aggregation device 151. The host device 171 can communicate with the aggregation device 151 via, for example, a mobile phone line. Further, the aggregation device 151 receives the information transmitted from the host device 171 and transfers the received information to the parent device 102.

Hereinafter, the communication device 101 side as viewed from the upper device 171 may be referred to as the "downstream side", and the higher device 171 side as viewed from the communication device 101 may be referred to as the "upstream side". Further, the direction from the higher-level device 171 to the communication device 101 may be referred to as a "downward direction", and the direction from the communication device 101 to the higher-level device 171 may be referred to as an "upward direction".

The number of communication devices 101 included in the monitoring system T1 is not particularly limited, and is, for example, 50 or more.

FIG. 3 is a diagram showing an example of address allocation in the communication system according to the embodiment of the present disclosure. Hereinafter, a case where the communication system 301 includes the communication device 101A and the communication device 101B, which are the communication devices 101, will be described. The communication device 101A and the communication device 101B are installed in this order from the upstream side.

With reference to FIG. 3, in the communication system 301, different identification information, for example, a short address is fixedly assigned to the aggregation device 151, the parent device 102, the communication device 101, and the host device 171.

Further, a network identifier, for example, PAN_ID (Personal Area Network Identification) is fixedly assigned to the monitoring system T1.

Further, in the communication system 301, communication using, for example, a mobile phone line is performed between the host device 171 and the aggregation device 151. As a communication protocol between the host device 171 and the aggregation device 151, a communication protocol for a mobile phone line, for example, an IP (Internet Protocol) is used.

On the other hand, for example, serial communication is performed between the aggregation device 151 and the parent device 102. A communication protocol for serial communication is used as a communication protocol between the aggregation device 151 and the parent device 102.

Further, between the parent device 102 and the communication device 101, and between the communication device 101, for example, wireless communication using a communication band of the 920 MHz band according to the communication standard of IEEE802.154 is performed. The communication protocol for wireless communication is used as the communication protocol between the parent device 102 and the communication device 101, and between the communication devices 101.

In the communication system 301, the parent device 102, the plurality of communication devices 101, the aggregation device 151, and the host device 171 store identification information as a source address and a destination address, for example, a source short address and a destination short address, respectively. Send and receive packets.

FIG. 4 is a diagram showing an example of a configuration of a communication device in the communication system according to the embodiment of the present disclosure.

With reference to FIG. 4, the communication device 101 includes a communication unit 11, a communication control unit 12, a storage unit 13, a packet generation unit 14, and a sensor 111.

The communication device 101 acquires measurement information indicating the measurement result of the sensor 111 by itself, and transfers the acquired measurement information to another communication device 101 or the parent device 102 on the upstream side.

More specifically, the communication device 101 generates a packet including the measurement result of the sensor 111 and transfers the packet to another communication device 101 or the parent device 102.

Specifically, the sensor 111 measures, for example, the current flowing through the electric wire 1, the voltage of the electric wire 1, the temperature of the electric wire 1, and the like. The detection target of the sensor 111 is not particularly limited.

The sensor 111 outputs measurement information indicating the measurement result of the detection target to the packet generation unit 14.

The packet generation unit 14 generates an application packet in which the measurement information received from the sensor 111 is stored, for example, at a predetermined measurement cycle, and outputs the generated application packet to the communication control unit 12.

The communication control unit 12 generates a routing packet including an application packet received from the packet generation unit 14.

FIG. 5 is a diagram showing an example of a packet used in the communication system according to the embodiment of the present disclosure. FIG. 5 shows the format of the routing packet.

With reference to FIG. 5, the routing packet includes, for example, a routing header and an application packet stored in the payload.

The routing header includes, for example, "PAN_ID", "destination short address", and "source short address".

The application packet contains, for example, an application header and an application payload. The application payload contains measurement information.

Then, the communication control unit 12 sets the "PAN_ID", "destination short address", and "source short address" of the generated routing packet by referring to the network information stored in the storage unit 13, for example. To do.

The network information includes the PAN_ID of the monitoring system T1, the short address of the host device 171, the short address of the aggregation device 151 in the monitoring system T1, the short address of the parent device 102 in the monitoring system T1, and a plurality of communications in the monitoring system T1. The correspondence relationship with the short address of the apparatus 101 is shown.

More specifically, the communication control unit 12 sets, for example, the PAN_ID of the monitoring system T1 to which its own communication device 101 belongs in the "PAN_ID" of the generated routing packet, and transmits the routing packet to the "destination short address". The short address of the host device 171 to be to be set is set, and the short address of the own communication device 101 is set in the "source short address".

Then, the communication control unit 12 generates a wireless packet in which a wireless header is added to the routing packet.

FIG. 6 is a diagram showing an example of a packet used in the communication system according to the embodiment of the present disclosure. FIG. 6 shows the format of a wireless packet transmitted by wireless communication at 920 MHz.

With reference to FIG. 6, the radio packet includes a radio header and a routing packet stored in the payload.

The radio header includes, for example, a "destination short address" and a "source short address".

Then, the communication control unit 12 sets the transmission route of the generated wireless packet according to, for example, the communication standard of IEEE802.1.5. With reference to FIG. 2 again, an example of the transmission route of the radio packet is shown by the broken line. In this example, two communication devices 101 out of the three communication devices 101 provided at positions corresponding to each other each provide the created wireless packet to another communication device 101 (hereinafter, representative communication) provided at the corresponding position. Also referred to as a device).

In the above example, the communication control unit 12 sets the transmission route of the radio packet by referring to the network information stored in the storage unit 13, for example, and sets the radio packet based on the set transmission route. Acquire the short address of the representative communication device to be transmitted, and set the acquired short address as the "destination short address" in the wireless header.

Further, the communication control unit 12 sets the short address of its own communication device 101 in the "source short address" in the wireless header of the wireless packet, and outputs the wireless packet to the communication unit 11.

The communication unit 11 transmits a 920 MHz band radio signal including a radio packet received from the communication control unit 12.

The communication unit 11 in the representative communication device receives, for example, a 920 MHz band wireless signal transmitted from another communication device 101, acquires a wireless packet included in the received wireless signal, and outputs the wireless packet to the communication control unit 12.

The communication control unit 12 confirms the destination short address in the radio header of the radio packet received from the communication unit 11, and when the destination short address indicates its own communication device 101, the communication control unit 12 confirms the destination in the routing packet of the radio packet. Check the short address.

Then, since the transmission destination short address in the confirmed routing packet indicates the higher-level device 171, the communication control unit 12 transmits the wireless packet to, for example, the communication device 101 or the parent device 102 on the upstream side of its own communication device 101. Transfer via 11.

More specifically, the communication control unit 12 acquires the short address of the communication device 101 or the parent device 102 upstream of its own communication device 101 by referring to the network information stored in the storage unit 13. The acquired short address is set as the "destination short address" in the wireless header and output to the communication unit 11.

The communication unit 11 transmits a 920 MHz band radio signal including a radio packet received from the communication control unit 12.

FIG. 7 is a diagram showing an example of a configuration of a parent device in the communication system according to the embodiment of the present disclosure.

With reference to FIG. 7, the parent device 102 includes a communication unit 21, a communication control unit 22, a storage unit 23, a wired communication unit 24, a packet generation unit 25, and a sensor 112.

The communication unit 21 in the parent device 102 receives, for example, a 920 MHz band radio signal transmitted from the communication device 101, acquires a radio packet included in the received radio signal, and outputs the radio packet to the communication control unit 22.

The communication control unit 22 confirms the destination short address in the radio header of the radio packet received from the communication unit 21, and when the destination short address indicates its own parent device 102, the communication control unit 22 indicates the destination in the routing packet of the radio packet. Check the short address.

Then, since the transmission destination short address in the confirmed routing packet indicates the host device 171, the communication control unit 22 transfers the routing packet included in the wireless packet to the aggregation device 151.

More specifically, the communication control unit 22 generates a serial packet in which the radio header of the radio packet is replaced with the serial header used in the communication protocol for serial communication.

Specifically, the communication control unit 22 acquires the short address of the aggregation device 151 by referring to the network information stored in the storage unit 23, and generates a serial header including the acquired short address.

Then, the communication control unit 22 generates a serial packet in which the wireless header of the wireless packet is replaced with the generated serial header, and outputs the generated serial packet to the wired communication unit 24.

The wired communication unit 24 transmits the serial packet received from the communication control unit 22 to the aggregation device 151 via the serial cable.

With reference to FIG. 2 again, the aggregation device 151 receives the serial packet from the parent device 102, converts the received serial packet into, for example, an IP packet used in IP, and transfers the received serial packet to the host device 171.

The host device 171 receives the IP packet from the aggregation device 151, and performs various calculations based on the measurement information included in the received IP wireless packet, for example.

Further, the aggregation device 151 generates, for example, a routing packet including an application packet in which the setting information of the corresponding communication device 101 in the monitoring system T1 is stored, and the generated routing packet is used as the parent device 102 and another communication device 101. Send via.

More specifically, the aggregation device 151 sets the PAN_ID of the monitoring system T1 to which it belongs to the "PAN_ID" of the generated routing packet by referring to the network information stored in the storage unit (not shown), for example. The short address of the communication device 101 to which the routing packet should be transmitted is set in the "destination short address", and the own short address is set in the "source short address".

Further, the aggregating device 151 sets a transmission route of the routing packet by referring to network information stored in a storage unit (not shown), and the parent to transmit the routing packet based on the set transmission route. Acquire the short address of the device 102.

Then, the aggregation device 151 generates a serial packet in which a serial header including the acquired short address as a "destination short address" is added to the routing packet, and transmits the generated serial packet to the parent device 102 via the serial cable. To do.

With reference to FIG. 7 again, the wired communication unit 24 in the parent device 102 receives the serial packet transmitted from the aggregation device 151 via the serial cable, and outputs the received serial packet to the communication control unit 22.

The communication control unit 22 confirms the destination short address in the routing packet of the serial packet received from the wired communication unit 24, and since the destination short address indicates the communication device 101, the serial header of the serial packet is a wireless header. Generates a wireless packet replaced with.

Specifically, the communication control unit 22 sets a transmission route for the wireless packet by referring to the network information stored in the storage unit 23, and transmits the wireless packet based on the set transmission route. The short address of the communication device 101 to be output is acquired, and the acquired short address is set as the destination short address in the wireless header of the wireless packet.

Then, the communication control unit 22 sets the short address of its own parent device 102 as the source short address in the radio header of the radio packet, and outputs the radio packet to the communication unit 21.

The communication unit 21 transmits a 920 MHz band radio signal including a radio packet received from the communication control unit 22.

For example, the communication unit 11 in the communication device 101 receives a wireless signal in the 920 MHz band transmitted from the parent device 102, acquires a wireless packet included in the received wireless signal, and outputs the wireless packet to the communication control unit 12.

The communication control unit 12 confirms the destination short address in the radio header of the radio packet received from the communication unit 11, and when the destination short address indicates its own communication device 101, the communication control unit 12 confirms the destination in the routing packet of the radio packet. Check the short address.

Then, when the transmission destination short address in the confirmed routing packet indicates another communication device 101, the communication control unit 12 transfers the radio packet via the communication unit 11.

On the other hand, when the destination short address in the routing packet indicates its own communication device 101, the communication control unit 12 acquires the setting information and the like included in the wireless packet and reflects the contents of the acquired setting information in itself. ..

[Task]
In such a communication system, for example, when the measurement result of the sensor is abnormal, the notification of the abnormality is urgent.

However, when a large number of communication devices in a communication system transmit sensor measurement results with high frequency, the bandwidth occupancy of the transmission route becomes high. In such a situation, the transmitted packet is often lost, and the information indicating the abnormality may not reach the notification destination.

In such a case, for example, even if the information is retransmitted, it takes a longer time before the abnormality is notified.

On the other hand, in the communication system according to the embodiment of the present disclosure, the above problem is solved by the following configuration and operation.

With reference to FIGS. 2 and 4 again, when the communication control unit 12 in the communication device 101 determines that the measurement result indicated by the measurement information included in the application packet received from the packet generation unit 14 is abnormal, the measurement is performed. Generates a specific packet for notifying an abnormality, including information and its own short address as the source short address.

More specifically, the communication control unit 12 measures, for example, when the current flowing through the electric wire 1, the voltage of the electric wire 1, the temperature of the electric wire 1, or the like indicated by the measurement information included in the application packet is equal to or more than a predetermined threshold value. Judge that the result is abnormal and generate a specific packet.

FIG. 8 is a diagram showing an example of a specific packet used in the communication system according to the embodiment of the present disclosure. FIG. 8 shows the format of a routing packet as an example of a specific packet.

With reference to FIG. 8, the specific packet further includes an "operation type" in the routing header as compared to the routing packet shown in FIG.

The operation type is an example of type information and indicates whether or not the packet is a specific packet. Specifically, a packet is a specific packet when a specific bit (hereinafter, also referred to as an abnormal bit) in the operation type is "1", and a specific packet is a specific packet when the abnormal bit is "0". A packet containing different types of information, that is, a packet of a type different from that of a specific packet (hereinafter, also referred to as a normal packet).

Then, the communication control unit 12 sets the PAN_ID of the monitoring system T1 to which its own communication device 101 belongs to the "PAN_ID" of the generated specific packet by referring to the network information stored in the storage unit 13, for example. , The short address of the host device 171 to which the specific packet should be transmitted is set in the "destination short address", and the short address of the own communication device 101 is set in the "source short address".

Next, the communication control unit 12 generates a wireless packet in which a wireless header is added to the specific packet, and sets the transmission route of the generated wireless packet by, for example, referring to the network information stored in the storage unit 13. Then, the short address of the communication device 101, for example, the representative communication device to which the wireless packet should be transmitted is acquired based on the set transmission route, and the acquired short address is set as the "destination short address" in the wireless header of the wireless packet. To do.

Further, the communication control unit 12 sets its own short address in the "source short address" in the radio header of the radio packet, and outputs the radio packet to the communication unit 11.

The communication unit 11 transmits a 920 MHz band radio signal including a radio packet received from the communication control unit 12.

Further, when the communication control unit 12 determines that the measurement result indicated by the measurement information included in the application packet received from the packet generation unit 14 is abnormal, the communication control unit 12 performs a process of discarding the normal application packet for a predetermined period.

More specifically, when the communication control unit 12 determines that the measurement result indicated by the measurement information included in the application packet received from the packet generation unit 14 is abnormal, for example, it transitions from the normal state to the specific control state.

Then, when the communication control unit 12 receives an application packet in which measurement information indicating a normal measurement result is stored from the packet generation unit 14 within 100 milliseconds after the transition to the specific control state, the application packet is received. Is destroyed.

The communication unit 11 in the representative communication device receives, for example, a 920 MHz band wireless signal transmitted from another communication device 101, acquires a wireless packet included in the received wireless signal, and outputs the wireless packet to the communication control unit 12.

The communication control unit 12 confirms the destination short address in the radio header of the radio packet received from the communication unit 11, and when the destination short address indicates its own communication device 101, the communication control unit 12 confirms the destination in the routing packet of the radio packet. Check the short address.

Then, since the destination short address in the confirmed routing packet indicates the host device 171, the communication control unit 12 sends the wireless packet including the specific packet to the other communication device 101 or the parent device 102 via the communication unit 11. Forward.

More specifically, the communication control unit 12 includes, for example, wireless communication via the communication unit 11 including identification information of another transfer destination, that is, a new transfer destination in the wireless packet including the specific packet received from the communication unit 11. Transfers to the communication device 101 or the parent device 102 on the upstream side of the own communication device 101.

Specifically, the communication control unit 12 refers to the network information stored in the storage unit 13 to use the communication device 101 or the parent device on the upstream side of the communication device 101 as the identification information of the new transfer destination. The short address of 102 is acquired, the acquired short address is set as the "destination short address" in the wireless header, and the short address is output to the communication unit 11.

The communication unit 11 transmits a 920 MHz band radio signal including a radio packet received from the communication control unit 12.

Further, the communication control unit 12 confirms an abnormal bit in the routing packet of the wireless packet received from the communication unit 11, and when the abnormal bit is "1", that is, when the routing packet is a specific packet, the specific packet A discarding process for discarding a different type of packet, that is, a normal packet, is performed for a predetermined period.

More specifically, when the communication control unit 12 confirms that the routing packet received from the communication unit 11 is a specific packet, for example, it transitions from the normal state to the specific control state.

Then, when the communication control unit 12 receives the normal packet from the communication unit 11 within, for example, 100 milliseconds after the transition to the specific control state, the communication control unit 12 discards the normal packet without forwarding it.

Further, when the communication control unit 12 receives an application packet in which measurement information indicating a normal measurement result is stored from the packet generation unit 14 in the specific control state, the communication control unit 12 discards the application packet.

On the other hand, when the communication control unit 12 receives an application packet containing measurement information indicating an abnormal measurement result from the packet generation unit 14 in the specific control state, the communication control unit 12 generates a specific packet including the application packet and generates the specific packet. A wireless packet including a packet is transferred to another communication device 101 or a parent device 102 via the communication unit 11.

Further, in the specific control state, when the wireless packet newly received from the communication unit 11 includes the specific packet, the communication control unit 12 transmits the wireless packet to another communication device 101 or the parent device 102 via the communication unit 11. Forward.

Here, the communication control unit 12 newly sets the predetermined period each time a specific packet is generated or a specific packet is received. More specifically, when the communication control unit 12 generates a specific packet in the specific control state or receives a radio packet including the specific packet from the communication unit 11, the progress since the transition to the specific control state occurs. The time is reset to zero and the specific control state is maintained until a new 100 milliseconds, that is, a predetermined period elapses.

Then, the communication control unit 12 does not generate or receive the specific packet, and for example, 100 milliseconds have elapsed since the transition to the specific control state, or for example, 100 milliseconds have elapsed since the elapsed time was reset. Then, the transition from the specific control state to the normal state occurs.

In the communication system 301, the communication device 101 receives a radio packet including a specific packet regardless of the identification information included in the radio packet.

More specifically, in the communication device 101 (hereinafter, also referred to as a non-destination communication device) different from the representative communication device, for example, the short address of the representative communication device is set to the "destination short address" of the wireless header. Receives the wireless packet transmitted from the communication device 101 of.

Specifically, the communication unit 11 in the non-destination communication device receives, for example, a 920 MHz band radio signal transmitted from another communication device 101, acquires a radio packet included in the received radio signal, and controls communication. Output to unit 12.

When the communication control unit 12 confirms the destination short address in the wireless header of the wireless packet received from the communication unit 11, and the destination short address indicates a communication device 101 or a parent device 102 other than its own communication device 101, The wireless packet is not transferred to another communication device 101 or a parent device 102.

Further, the communication control unit 12 confirms an abnormal bit in the routing packet of the wireless packet received from the communication unit 11, and when the abnormal bit is "1", that is, when the routing packet is a specific packet, it is normal. A discard process is performed for a predetermined period to transition from a state to a specific control state and discard a packet of a type different from the specific packet, that is, a normal packet.

On the other hand, the communication control unit 12 discards the radio packet when the abnormal bit in the routing packet of the radio packet received from the communication unit 11 is "0", that is, when the routing packet is a normal packet.

In the communication system 301, the parent device 102 receives the radio packet including the specific packet regardless of the identification information included in the radio packet.

With reference to FIG. 7 again, the communication unit 21 in the parent device 102 receives, for example, a 920 MHz band radio signal transmitted from the communication device 101, acquires a radio packet included in the received radio signal, and controls communication. Output to unit 22.

The communication control unit 22 confirms the destination short address in the radio header of the radio packet including the specific packet received from the communication unit 21, and when the destination short address indicates its own parent device 102, the communication control unit 22 of the radio packet. Check the destination short address in the routing packet.

Then, since the transmission destination short address in the confirmed routing packet indicates the host device 171, the communication control unit 22 transfers the specific packet included in the wireless packet to the aggregation device 151.

More specifically, the communication control unit 22 generates a serial packet in which the radio header of the radio packet is replaced with the serial header used in the communication protocol for serial communication.

Specifically, the communication control unit 22 acquires the short address of the aggregation device 151 by referring to the network information stored in the storage unit 23, and generates a serial header including the acquired short address.

Then, the communication control unit 22 generates a serial packet in which the wireless header of the wireless packet is replaced with the generated serial header, and outputs the generated serial packet to the wired communication unit 24.

The wired communication unit 24 transmits the serial packet received from the communication control unit 22 to the aggregation device 151 via the serial cable.

On the other hand, the communication control unit 22 aggregates the wireless packets when the destination short address in the wireless header of the wireless packet received from the communication unit 21 indicates the communication device 101, that is, when the destination short address is not its own short address. No transfer to 151 is performed.

Then, the communication control unit 22 confirms the abnormal bit in the routing packet of the wireless packet, and when the abnormal bit is "1", that is, when the routing packet is a specific packet, the type different from the specific packet. A discarding process for discarding a packet, that is, a normal packet, is performed for a predetermined period.

More specifically, when the communication control unit 22 confirms that the routing packet is a specific packet, for example, it transitions from the normal state to the specific control state.

Then, when the communication control unit 22 receives the normal packet from the communication unit 21 within, for example, 100 milliseconds after the transition to the specific control state, the communication control unit 22 discards the normal packet without forwarding it.

Further, the communication control unit 22 discards the normal packet received from the wired communication unit 24 without forwarding within, for example, 100 milliseconds after the transition to the specific control state.

Further, when the communication control unit 22 receives an application packet containing measurement information indicating a normal measurement result from the packet generation unit 25 in the specific control state, the communication control unit 22 discards the application packet.

On the other hand, when the communication control unit 22 receives an application packet in which measurement information indicating an abnormal measurement result is stored from the packet generation unit 25 in the specific control state, the communication control unit 22 generates a specific packet including the application packet and generates the specific packet. The wireless packet including the packet is transferred to the communication device 101 via the communication unit 21.

Further, in the specific control state, when the wireless packet newly received from the communication unit 21 includes the specific packet, the communication control unit 22 transfers the specific packet to the aggregation device 151 via the wired communication unit 24.

Here, the communication control unit 22 newly sets the predetermined period each time the transmission destination short address receives a specific packet indicating the communication device 101 from the communication unit 21. More specifically, when the communication control unit 22 receives a radio packet including the specific packet from the communication unit 21 in the specific control state, the communication control unit 22 resets the elapsed time from the transition to the specific control state to zero. The specific control state is maintained until a new 100 milliseconds, that is, a predetermined period elapses.

Then, the communication control unit 22 does not receive the specific packet whose destination short address indicates the communication device 101, and for example, 100 milliseconds have elapsed since the transition to the specific control state, or the elapsed time is reset. After that, for example, when 100 milliseconds have passed, the state changes from the specific control state to the normal state.

When the destination short address in the wireless header of the wireless packet received from the communication unit 21 indicates its own parent device 102, the communication control unit 22 confirms the abnormal bit in the routing packet of the wireless packet, and the abnormal bit. When is "1", that is, when the routing packet is a specific packet, a discarding process for discarding a packet of a type different from the specific packet, that is, a normal packet may be performed for a predetermined period.

[Operation flow]
Each device in the communication system according to the embodiment of the present disclosure includes a computer including a memory, and an arithmetic processing unit such as a CPU in the computer is a program including a part or all of each step of the following sequence diagram or flowchart. Are read from the memory and executed. The programs of these plurality of devices can be installed from the outside. The programs of these plurality of devices are distributed in a state of being stored in a recording medium.

9 and 10 are diagrams showing a sequence of discard processing in the communication system according to the embodiment of the present disclosure. FIG. 9 shows, as an example, the operations of the aggregation device 151, the parent device 102, and the communication devices 101A, 101B, and 101C, which are the communication devices 101. FIG. 10 shows the continuation of FIG.

With reference to FIGS. 9 and 10, first, when the communication device 101A determines that the measurement result indicated by the measurement information output by its own sensor 111 is abnormal (step S101), the communication device 101A is usually The transition from the state to the specific control state (step S102).

Further, the communication device 101A generates a wireless packet including a specific packet including the measurement information and includes the short address of the communication device 101B to be the transfer destination of the measurement information as identification information, and transfers the measurement information by wireless communication. Then, the communication device 101B receives a wireless packet including a specific packet from the communication device 101A. Further, the communication device 101C receives the radio packet including the specific packet regardless of the identification information included in the radio packet (step S103).

Next, the communication device 101B performs a discarding process for discarding a normal packet of a type different from the specific packet for a predetermined period. That is, the communication device 101B transitions from the normal state to the specific control state (step S104).

Further, the communication device 101C performs a discarding process for discarding a normal packet of a type different from the specific packet for a predetermined period. That is, the communication device 101C transitions from the normal state to the specific control state (step S105).

Further, the communication device 101B to which the measurement information is transferred includes the short address of the communication device 101C to be the new transfer destination in the wireless packet including the received specific packet as the identification information and transfers the measurement information by wireless communication (step S106). ..

Next, the communication device 101C receives the radio packet including the specific packet from the communication device 101B in the specific control state. Then, the communication device 101C resets the elapsed time from the transition to the specific control state (step S107).

Further, the communication device 101C includes the short address of the parent device 102 to be a new transfer destination in the wireless packet including the received specific packet as identification information and transfers the packet by wireless communication (step S108).

Next, when the measurement information output by the sensor 111 of the communication device 101B in the specific control state shows a normal measurement result (step S109), the communication device 101B generates a wireless packet including a normal packet in which the measurement information is stored. And the application packet in which the measurement information is stored is discarded without forwarding (step S110).

Next, the parent device 102 receives a wireless packet including a specific packet from the communication device 101C. Then, the parent device 102 transitions from the normal state to the specific control state (step S111).

Further, the parent device 102 generates a serial packet including the short address of the aggregation device 151 to be a new forwarding destination as identification information in the specific packet included in the received wireless packet, and generates a serial packet including the generated specific packet. Transfer to the aggregation device 151. Then, the aggregation device 151 receives the serial packet (step S112).

Next, when the measurement information output by its own sensor 112 indicates a normal measurement result (step S113), the parent device 102 in the specific control state generates a serial packet including a normal packet in which the measurement information is stored. And the application packet in which the measurement information is stored is discarded without forwarding (step S114).

Next, when the communication device 101C determines that the measurement result indicated by the measurement information output by its own sensor 111 is abnormal, the communication device 101C generates a specific packet including the measurement information (step S115). Then, the communication device 101C resets the elapsed time from the transition to the specific control state (step S116).

Further, the communication device 101C generates a wireless packet including the generated specific packet and includes the short address of the parent device 102 as the transfer destination of the measurement information as the identification information, and transfers the packet by wireless communication. Then, the parent device 102 receives the radio packet including the specific packet from the communication device 101C in the specific control state (step S117).

Next, the parent device 102 in the specific control state receives the radio packet including the specific packet from the communication device 101C. Then, the parent device 102 resets the elapsed time from the transition to the specific control state (step S118).

Further, the parent device 102 generates a serial packet including the short address of the aggregation device 151 to be a new forwarding destination as identification information in the specific packet included in the received wireless packet, and generates a serial packet including the generated specific packet. Transfer to the aggregation device 151. Then, the aggregation device 151 receives the serial packet (step S119).

Next, the communication device 101A transitions from the specific control state to the normal state after a lapse of a predetermined time after the transition to the specific control state (step S120).

Next, the communication device 101B transitions from the specific control state to the normal state after a predetermined time has elapsed from the transition to the specific control state (step S121).

Next, the communication device 101B generates a normal packet including measurement information indicating a normal measurement result output by its own sensor 111 in a normal state. Then, the communication device 101B generates a wireless packet including the generated normal packet and includes the short address of the communication device 101C to be the transfer destination of the measurement information as identification information, and transfers the packet by wireless communication (step S122).

Next, the communication device 101C in the specific control state receives the wireless packet including the normal packet from the communication device 101B, and discards the received wireless packet without transferring it (step S123).

Next, the communication device 101C transitions from the specific control state to the normal state after a predetermined time has elapsed after resetting the elapsed time (step S124).

Next, the aggregation device 151 generates a serial packet including a normal packet in which the setting information of the parent device 102 and the like are stored, and transfers the serial packet including the generated normal packet to the parent device 102 (step S125).

Next, the parent device 102 in the specific control state receives the serial packet including the normal packet from the aggregation device 151, and discards the serial packet without transferring the normal packet included in the received serial packet (step). S126).

Next, the communication device 101C generates a normal packet including measurement information indicating a normal measurement result output by its own sensor 111 in a normal state. Then, the communication device 101C generates a wireless packet including the generated normal packet and includes the short address of the parent device 102 as the transfer destination of the measurement information as the identification information, and transfers the packet by wireless communication (step S127).

Next, the parent device 102 in the specific control state receives the wireless packet including the normal packet from the communication device 101C, and discards the received wireless packet without transferring it (step S128).

Next, when the parent device 102 in the specific control state determines that the measurement result indicated by the measurement information output by its own sensor 111 is abnormal, it generates a specific packet containing the measurement information (step S129). Then, the parent device 102 resets the elapsed time from the transition to the specific control state (step S130).

Next, the parent device 102 generates a serial packet that includes the generated specific packet and includes the short address of the aggregation device 151 that should be the transfer destination of the measurement information as the identification information, and generates a serial packet that includes the generated specific packet. Transfer to the aggregation device 151. Then, the aggregation device 151 receives the serial packet (step S131).

Next, the parent device 102 transitions from the specific control state to the normal state after a predetermined time has elapsed after resetting the elapsed time (step S132).

In the examples shown in FIGS. 9 and 10, the discarding process by the communication device 101A is performed during the period from step S101 to step S120. The discarding process by the communication device 101B is performed during the period from step S104 to step S121. The discarding process by the communication device 101C is performed during the period from step S105 to step S124. The discarding process by the parent device 102 is performed during the period from step S111 to step S132. That is, in the communication system 301, the predetermined periods set by each communication device 101 and the parent device 102 may overlap.

FIG. 11 is a flowchart defining an operation procedure in a normal state of the communication device according to the embodiment of the present disclosure.

With reference to FIG. 11, first, the communication device 101 receives the radio packet transmitted from the other communication device 101 in the normal state (YES in step S201).

Next, when the destination short address in the received wireless packet indicates itself (YES in step S202), the communication device 101 should set the destination short address in the wireless packet as a new transfer destination of the wireless packet. The short address of the communication device 101 or the parent device 102 is set (step S203).

Next, the communication device 101 transfers the wireless packet in which the short address of the communication device 101 or the parent device 102 to be the new transfer destination of the wireless packet is set to the communication device 101 or the parent device 102 having the short address. (Step S204).

Next, the communication device 101 confirms whether or not the wireless packet includes a specific packet regardless of the destination short address in the received wireless packet (step S205).

On the other hand, when the transmission destination short address in the received wireless packet indicates another communication device 101 or the parent device 102 (NO in step S202), the communication device 101 wirelessly operates regardless of the transmission destination short address in the received wireless packet. It is confirmed whether or not the packet includes a specific packet (step S205).

When the received wireless packet includes a normal packet (NO in step S205), the communication device 101 discards the wireless packet (step S206) and waits for a new wireless packet (step S201).

On the other hand, when the received wireless packet includes the specific packet (YES in step S205), the communication device 101 transitions from the normal state to the specific control state (step S207).

Further, when the communication device 101 generates an application packet (hereinafter, also referred to as an abnormal packet) including measurement information indicating an abnormal measurement result output by its own sensor 111 (NO in step S201 and YES in step S208). ), A wireless packet including a specific packet in which the abnormal packet is stored is generated and transferred to the communication device 101 or the parent device 102 (step S209). Then, the communication device 101 transitions from the normal state to the specific control state (step S207).

On the other hand, when the communication device 101 generates an application packet (hereinafter, also referred to as a normal packet) including measurement information indicating a normal measurement result output by its own sensor 111 (NO in step S201, NO in step S208). And YES in step S210), a wireless packet including a normal packet in which the normal packet is stored is generated and transferred to the communication device 101 or the parent device 102 (step S211). Then, the communication device 101 listens for a new wireless packet (step S201).

Further, when the communication device 101 does not generate the application packet (NO in step S210), the communication device 101 listens for a new wireless packet (step S201).

FIG. 12 is a flowchart defining an operation procedure in a specific control state of the communication device according to the embodiment of the present disclosure.

With reference to FIG. 12, first, when the communication device 101 generates a normal packet including measurement information indicating a normal measurement result output by its own sensor 111 in a specific control state (YES in step S301). The normal packet including the normal packet is discarded without being transferred to the communication device 101 or the parent device 102 (step S302). Then, the communication device 101 maintains the specific control state (step S314).

On the other hand, when the communication device 101 generates an abnormal packet including measurement information indicating an abnormal measurement result output by its own sensor 111 in a specific control state (NO in step S301 and YES in step S303), the abnormality. A specific packet including a packet is generated and transferred to the communication device 101 or the parent device 102 (step S304). Then, the communication device 101 resets the elapsed time from the transition to the specific control state to zero (step S305), and maintains the specific control state (step S314).

When the communication device 101 receives a wireless packet including a normal packet from another communication device 101 (NO in step S301, NO in step S303 and YES in step S306), the communication device 101 transmits the wireless packet to the communication device 101 or the parent device. Discard without transferring to 102 (step S307). Then, the communication device 101 maintains the specific control state (step S314).

Further, the communication device 101 receives a wireless packet including a specific packet from another communication device 101 in the specific control state (NO in step S301, NO in step S303, NO in step S306, and step S308). YES), when the destination short address in the wireless packet indicates itself (YES in step S309), the communication device 101 or the parent device 102 to be the transfer destination of a new specific packet to the destination short address in the wireless packet. The short address of is set (step S310).

Next, the communication device 101 transfers a wireless packet set with a short address of the communication device 101 or the parent device 102 to be the transfer destination of the next specific packet to the communication device 101 or the parent device 102 having the short address. (Step S311).

Next, the communication device 101 resets the elapsed time from the transition to the specific control state to zero (step S312). Then, the communication device 101 maintains the specific control state (step S314).

On the other hand, when the destination short address in the wireless packet indicates another communication device 101 or the parent device 102 (NO in step S309), the communication device 101 transfers the wireless packet to the other communication device 101 or the parent device 102. It is discarded without doing (step S313), and the elapsed time from the transition to the specific control state is reset to zero (step S312). Then, the communication device 101 maintains the specific control state (step S314).

Next, when a predetermined time elapses after the transition to the specific control state (YES in step S314), the communication device 101 transitions from the specific control state to the normal state (step S315).

On the other hand, the communication device 101 maintains the specific control state (step S301) when the elapsed time from the transition to the specific control state is less than a predetermined time (NO in step S314).

FIG. 13 is a flowchart defining an operation procedure in a normal state of the parent device according to the embodiment of the present disclosure.

With reference to FIG. 13, first, the parent device 102 receives the wireless packet transmitted from the communication device 101 in the normal state (YES in step S401).

Next, when the destination short address in the received wireless packet indicates the communication device 101, that is, when the destination short address is not its own short address (YES in step S402), the parent device 102 includes the specific packet in the wireless packet. It is confirmed whether or not the packet is received (step S405).

When the received wireless packet includes a normal packet (NO in step S405), the parent device 102 discards the wireless packet (step S406) and waits for a new wireless packet (step S401).

On the other hand, when the destination short address in the received wireless packet indicates itself (NO in step S402), the parent device 102 sets the short address of the aggregation device 151 as the destination short address based on the wireless packet. Generate a packet (step S403).

Next, the parent device 102 transfers the serial packet to the aggregation device 151 (step S404). Then, the parent device 102 listens for a new wireless packet (step S401).

On the other hand, when the received wireless packet includes the specific packet (YES in step S405), the parent device 102 transitions from the normal state to the specific control state (step S407).

Further, when the parent device 102 generates an abnormal packet including measurement information indicating an abnormal measurement result output by its own sensor 112 (NO in step S401 and YES in step S408), the abnormal packet is stored. A serial packet including a specific packet is generated and transferred to the aggregation device 151 (step S409). Then, the parent device 102 listens for a new wireless packet (step S401).

On the other hand, when the parent device 102 generates a normal packet including measurement information indicating a normal measurement result output by its own sensor 112 (NO in step S401, NO in step S408 and YES in step S410), the normal packet is generated. A serial packet including a normal packet in which the packet is stored is generated and transferred to the aggregation device 151 (step S411). Then, the parent device 102 listens for a new wireless packet (step S401).

Further, when the parent device 102 does not generate the abnormal packet and the normal packet (NO in step S410), the parent device 102 listens for a new wireless packet (step S401).

FIG. 14 is a flowchart defining an operation procedure in a specific control state of the parent device according to the embodiment of the present disclosure.

With reference to FIG. 14, first, when the parent device 102 generates a normal packet including measurement information indicating a normal measurement result output by its own sensor 112 in a specific control state (YES in step S501). The normal packet including the normal packet is discarded without being transferred to the aggregation device 151 (step S502). Then, the parent device 102 maintains the specific control state (step S513).

On the other hand, when the parent device 102 generates an abnormal packet including measurement information indicating an abnormal measurement result output by its own sensor 112 in a specific control state (NO in step S501 and YES in step S503), the abnormality. A specific packet including the packet is generated and transferred to the aggregation device 151 (step S504). Then, the parent device 102 maintains the specific control state (step S513).

Further, when the parent device 102 receives a wireless packet including a normal packet from the communication device 101 or a serial packet including a normal packet from the aggregation device 151 (NO in step S501, NO in step S503 and YES in step S505). The wireless packet or the serial packet is discarded without being transferred to the aggregation device 151 or the communication device 101 (step S506). Then, the parent device 102 maintains the specific control state (step S513).

Further, the parent device 102 receives a wireless packet including the specific packet from the communication device 101 in the specific control state (NO in step S501, NO in step S503, NO in step S505 and YES in step S507). When the destination short address in the radio packet indicates itself (NO in step S508), a serial packet in which the short address of the aggregation device 151 is set as the destination short address is generated based on the radio packet (step S509). ).

Next, the parent device 102 transfers the serial packet to the aggregation device 151 (step S510). Then, the parent device 102 maintains the specific control state (step S513).

On the other hand, when the destination short address in the wireless packet indicates the communication device 101, that is, when the destination short address is not its own short address (YES in step S508), the parent device 102 discards the wireless packet without forwarding it. Then (step S511), the elapsed time from the transition to the specific control state is reset to zero (step S512). Then, the parent device 102 maintains the specific control state (step S513).

Next, when the predetermined time elapses after the transition to the specific control state (YES in step S513), the parent device 102 transitions from the specific control state to the normal state (step S514).

On the other hand, the parent device 102 maintains the specific control state (step S501) when the elapsed time from the transition to the specific control state is less than a predetermined time (NO in step S513).

In the communication system according to the embodiment of the present disclosure, the parent device 102 and the aggregation device 151 are connected by a serial cable to perform serial communication, but the present invention is not limited to this. The parent device 102 and the aggregation device 151 may be configured to perform wireless communication using a mobile phone line, wireless communication using a communication band of the 920 MHz band, or the like without being connected by a serial cable, for example.

Further, in the communication system according to the embodiment of the present disclosure, the parent device 102 and the aggregation device 151 are considered to be separate devices, but the present invention is not limited thereto. The aggregation device 151 may include a parent device 102 and may be configured to perform wireless communication using, for example, a mobile phone line, or wireless communication with a communication device 101 using a communication band of the 920 MHz band.

Further, in the communication system according to the embodiment of the present disclosure, the parent device 102 is configured to transfer a specific packet to the aggregation device 151, but the present invention is not limited to this. In the communication system 301, the parent device 102 may be configured to transfer a specific packet to a device different from the aggregation device 151, which is the transfer destination of the normal packet, for example.

Further, in the communication system according to the embodiment of the present disclosure, the communication device 101 is, for example, configured to be provided for each steel tower 2 shown in FIG. 2, but is not limited to this. In the communication system 301, the communication devices 101 may be installed every other, every two, or every three towers, for example, in a plurality of towers 2 installed side by side, based on the installation interval of the towers 2. Good.

Further, in the communication system according to the embodiment of the present disclosure, the communication device 101 is configured to be provided on the electric wires 1U, 1V, and 1W, respectively, but the present invention is not limited to this. In the communication system 301, the communication device 101 may be installed at a plurality of positions where information necessary for maintenance of the power system can be detected. Specifically, for example, a plurality of communication devices 101 may be installed in each of the plurality of steel towers 2 shown in FIG. 2, or in the plurality of steel towers 2 themselves installed side by side, for example, the installation intervals of the steel towers 2. It may be installed every other, every two, or every three based on the above.

Further, in the communication system according to the embodiment of the present disclosure, the parent device 102 is configured to be provided on the electric wire 1U, the electric wire 1V, or the electric wire 1W, but the present invention is not limited to this. In the communication system 301, the parent device 102 may be installed at a position where information necessary for maintenance of the power system can be detected. Specifically, for example, the parent device 102 may be installed in any of the steel towers 2 shown in FIG.

Further, in the communication system according to the embodiment of the present disclosure, it is assumed that all the communication devices 101 are provided with the sensor 111, but the present invention is not limited to this. In the communication system 301, a part of the communication device 101 may be configured not to include the sensor 111. In this case, the communication device 101 transfers, for example, a wireless packet from another communication device 101.

Alternatively, when the communication device 101 does not include the sensor 111, the communication device 101 is provided with, for example, a sensor that outputs information necessary for maintenance of the power system on the electric wire 1 or the iron tower 2 itself in the power system. , The information transmitted from the sensor is received, and the received information is transferred to another communication device 101 or a parent device 102.

More specifically, the communication unit 11 in the communication device 101 receives the information transmitted from the sensor, and outputs the received information to the communication control unit 12. When the communication control unit 12 determines that the information received from the communication unit 11 is normal, the communication control unit 12 generates a packet containing the information or information indicating that the information is normal, and determines that the information is abnormal. If so, a specific packet containing the information or information indicating that the information is abnormal is generated.

Further, in the communication system according to the embodiment of the present disclosure, the parent device 102 is configured to include the sensor 112, but the present invention is not limited to this. The parent device 102 does not have to include the sensor 112. In this case, the parent device 102 transfers the wireless packet from the communication device 101 and the serial packet from the aggregation device 151.

Further, although the communication system according to the embodiment of the present disclosure is configured to include the parent device 102, the present invention is not limited to this. The communication system 301 may be configured not to include the parent device 102. In this case, in the communication system 301, at least one of the plurality of communication devices 101 transfers the radio packet to the aggregation device 151.

Further, in the communication system according to the embodiment of the present disclosure, the communication device 101 and the parent device 102 determine that the measurement result indicated by the measurement information output by their own sensor 111 or sensor 112 is abnormal in the normal state. If this is the case, the configuration is such that the transition to a specific control state is made, but the present invention is not limited to this. Even if the communication device 101 and the parent device 102 determine that the measurement result indicated by the measurement information output by their own sensor 111 or sensor 112 is abnormal in the normal state, they do not normally transition to the specific control state. It may be configured to maintain the state.

Further, in the communication system according to the embodiment of the present disclosure, the communication device 101 and the parent device 102 are configured to discard the normal packet generated in the specific control state, but the present invention is not limited to this. The communication device 101 and the parent device 102 may be configured to transfer a normal packet including a normal packet generated in a specific control state. In this case, the communication device 101 or the parent device 102 in the specific control state that received the normal packet discards the received normal packet.

Further, in the communication system according to the embodiment of the present disclosure, the communication control unit 12 in the communication device 101 and the communication control unit 22 in the parent device 102 receive application packets received from the packet generation unit 14 or the packet generation unit 25, respectively. The configuration is such that a packet including the included measurement information is generated, but the present invention is not limited to this. The communication control unit 12 and the communication control unit 22 may be configured to generate, for example, a packet including information indicating whether or not the measurement result indicated by the measurement information is normal.

Further, in the communication system according to the embodiment of the present disclosure, the "operation type" is included in the routing header in the routing packet, but the present invention is not limited to this. In the communication system 301, the "operation type" may be included in the radio header in the radio packet. In this case, the communication control unit 12 in the communication device 101 and the communication control unit 22 in the parent device 102 are specific in the operation type included in the wireless packet received from the communication unit 11 in the communication device 101 or the communication unit 21 in the parent device 102. It is confirmed whether or not the radio packet is a specific packet based on the bit.

In this case, in the routing packet in the payload of the radio packet, the "operation type" may or may not be included in the routing header of the routing packet.

By the way, in a network system as described in Patent Document 1, when the bandwidth occupancy of the transmission route is high, the loss of packets including various information to be transmitted is likely to occur, and the information is stably transmitted. It becomes difficult to do.

On the other hand, in the communication system according to the embodiment of the present disclosure, the plurality of communication devices 101 transfer packets including the identification information of the transfer destination by wireless communication. The communication device 101 receives a specific packet containing the specific type information regardless of the identification information, and when the specific packet is received, performs a discarding process of discarding a normal packet containing the type information different from the specific packet for a predetermined period. .. The transfer destination communication device 101 transfers the received specific packet by wireless communication including the identification information of another transfer destination.

In this way, the communication device 101 wirelessly transmits the specific packet, and the communication device 101 that is not the next transfer destination of the specific packet receives the specific packet and starts the discard process, so that the other than the next transfer destination of the specific packet is used. In the communication device 101, the traffic and the processing load can be reduced prior to the reception of the specific packet to be transferred. As a result, the transmission of the specific packet in the communication system 301 can be made more reliable.

Therefore, in the communication system according to the embodiment of the present disclosure, specific information can be stably transmitted in the communication system in which various information is transferred between communication devices.

Further, in the communication system according to the embodiment of the present disclosure, when the measurement result of the sensor provided in the power system is abnormal, the communication device 101 sends the measurement result or a specific packet including information based on the measurement result. Generate and transfer. When the measurement result is normal, the communication device 101 generates and transfers the measurement result or a packet including information based on the measurement result, which is a packet containing type information different from the specific packet.

With such a configuration, when there is an abnormality in the measurement result in the power system, the abnormality and the abnormal value can be notified more reliably.

Further, in the communication system according to the embodiment of the present disclosure, the communication device 101 discards a packet containing type information different from the specific packet and generated in a predetermined period, and is generated in the predetermined period. Forward a specific packet without discarding it.

With such a configuration, for example, in a situation where a specific packet is transmitted from another communication device 101, the specific packet generated by the own communication device 101 can also be transmitted in parallel.

Further, in the communication system according to the embodiment of the present disclosure, the parent device 102 relays information between at least one of the plurality of communication devices 101 and the aggregation device 151. The parent device 102 receives a specific packet regardless of the identification information of the transfer destination, and when it receives a specific packet that does not include its own identification information, the parent device 102 discards a normal packet containing type information different from the specific packet for a predetermined period. Performs discard processing.

With such a configuration, for example, in a communication system in which the parent device 102 relays information from another device to the communication device 101, the traffic and processing load on the parent device 102 are reduced prior to the reception of the specific packet to be transferred. It can be set, and the transmission of a specific packet can be made more reliable.

Further, in the communication device according to the embodiment of the present disclosure, the communication unit 11 performs wireless communication. The communication control unit 12 transfers the packet including the identification information of the transfer destination via the communication unit 11. The communication control unit 12 receives a specific packet containing the specific type information via the communication unit 11 regardless of the identification information, and when the specific packet is received, the communication control unit 12 receives a normal packet containing the type information different from the specific packet for a predetermined period. Discard Performs discard processing. When the identification information of the specific packet includes the identification information of its own communication device 101, the communication control unit 12 includes the identification information of another transfer destination in the received specific packet and transfers it via the communication unit 11.

In this way, the communication device 101 wirelessly transmits the specific packet, and the communication device 101 that is not the next transfer destination of the specific packet receives the specific packet and starts the discard process, so that the other than the next transfer destination of the specific packet is used. In the communication device 101, the traffic and the processing load can be reduced prior to the reception of the specific packet to be transferred. As a result, the transmission of the specific packet in the communication system 301 can be made more reliable.

Therefore, in the communication device according to the embodiment of the present disclosure, specific information can be stably transmitted in a communication system in which various information is transferred between the communication devices.

Further, in the communication control method in the communication system according to the embodiment of the present disclosure, first, the communication device 101 receives the specific packet regardless of the identification information of the transfer destination, and receives the type information different from the specific packet for a predetermined period. Performs discard processing that discards normal packets including. Next, the transfer destination communication device 101 transfers the received specific packet by wireless communication including the identification information of another transfer destination.

In this way, the communication device 101 wirelessly transmits the specific packet, and the communication device 101 that is not the next transfer destination of the specific packet receives the specific packet and starts the discard process, so that the other than the next transfer destination of the specific packet is used. In the communication device 101, the traffic and the processing load can be reduced prior to the reception of the specific packet to be transferred. As a result, the transmission of the specific packet in the communication system 301 can be made more reliable.

Therefore, in the communication control method in the communication system according to the embodiment of the present disclosure, specific information can be stably transmitted in the communication system in which various information is transferred between communication devices.

Further, in the communication control method in the communication device according to the embodiment of the present disclosure, first, a packet including the identification information of the transfer destination is transferred via the communication unit 11. Next, a specific packet containing specific type information is received via the communication unit regardless of the identification information, and when the specific packet is received, a discard process for discarding a normal packet containing type information different from the specific packet for a predetermined period. I do. Next, when the own communication device is the transfer destination of the specific packet, the received specific packet is transferred via the communication unit 11 including the identification information of the other transfer destination.

In this way, the communication device 101 wirelessly transmits the specific packet, and the communication device 101 that is not the next transfer destination of the specific packet receives the specific packet and starts the discard process, so that the other than the next transfer destination of the specific packet is used. In the communication device 101, the traffic and the processing load can be reduced prior to the reception of the specific packet to be transferred. As a result, the transmission of the specific packet in the communication system 301 can be made more reliable.

Therefore, in the communication control method in the communication device according to the embodiment of the present disclosure, specific information can be stably transmitted in the communication system in which various information is transferred between the communication devices.

It should be considered that the above embodiments are exemplary in all respects and not restrictive. The scope of the present invention is shown by the claims rather than the above description, and is intended to include all modifications within the meaning and scope of the claims.

The above description includes the features described below.
[Appendix 1]
A communication system used in the power system
Equipped with multiple communication devices that transfer packets containing forwarding destination identification information by wireless communication
The communication device receives a specific packet which is the packet containing the specific type information regardless of the identification information, and when the specific packet is received, the packet containing the type information different from the specific packet for a predetermined period. Performs a discard process and discards
The communication device of the transfer destination transfers the received specific packet by wireless communication including identification information of another transfer destination.
When the communication device transmits a wireless signal including the packet, the communication device other than the transfer destination can receive the wireless signal.
Each time the communication device receives the specific packet, the predetermined period is newly set.
A communication system in which the predetermined period set by each communication device may overlap.

[Appendix 2]
A communication device in a communication system used in an electric power system.
With the communication unit that performs wireless communication
It is provided with a communication control unit that transfers a packet containing identification information of a transfer destination via the communication unit.
The communication control unit receives a specific packet, which is the packet containing specific type information, via the communication unit regardless of the identification information, and when the specific packet is received, the specific packet is different from the specific packet for a predetermined period. Performs a discard process to discard the packet containing the type information,
When the specific packet includes the identification information of its own communication device, the communication control unit transfers the received specific packet including the identification information of another transfer destination via the communication unit.
When the communication device transmits a wireless signal including the packet, the communication device other than the transfer destination can receive the wireless signal.
Each time the communication device receives the specific packet, the predetermined period is newly set.
A communication device in which the predetermined period set by each communication device may overlap.

1,1U, 1V, 1W Electric wire 2 Tower 3 Lines 11,21 Communication unit 12,22 Communication control unit 13,23 Storage unit 14,25 Packet generator 24 Wired communication unit 101 Communication device 102 Parent device 111,112 Sensor 151 Aggregation Device 171 Upper device 301 Communication system

Claims (7)

A communication system used in the power system
Equipped with multiple communication devices that transfer packets containing type information and forwarding destination identification information by wireless communication.
The communication apparatus receives Regardless specific packet is the packet containing specific the type information to the identification information, when receiving the specific packet for a predetermined period, including said different type data from said particular packet Performs a discard process to discard the packet,
The communication device of the transfer destination is a communication system that transfers the received specific packet by wireless communication including identification information of another transfer destination. Sensor is provided in the power system,
When the measurement result of the sensor is abnormal, the communication device generates and transfers the measurement result or the specific packet including information based on the measurement result.
The communication device, when the measurement result is normal, the packet generated by the transferring comprising information based on different said measurement result a the packet including the type information or the measurement result from the specific packet , The communication system according to claim 1. The communication device, the discard the packets generated in the predetermined time period a said packet including said different type data from the specific packet transfer without discarding the specific packet generated in the predetermined time period The communication system according to claim 2. The communication system further
A parent device that relays information between at least one of the plurality of communication devices and the other device is provided.
The parent device receives Regardless the specific packet to the destination identification information, when receiving the specific packet that does not include the identification information of the self, the predetermined time period, the type information that is different from the specific packet The communication system according to any one of claims 1 to 3, wherein a discarding process for discarding the packet including the packet is performed. A communication device in a communication system used in an electric power system.
With the communication unit that performs wireless communication
It is provided with a communication control unit that transfers a packet containing type information and forwarding destination identification information via the communication unit.
Said communication control unit, the specific packet is the packet containing specific the type information received via the communication unit regardless of the identification information, when receiving the specific packet, the predetermined time period, wherein the specific packet performs discarding discarding process the packets containing different the category information,
The communication control unit is a communication device that, when the specific packet includes identification information of its own communication device, transfers the received specific packet including identification information of another transfer destination via the communication unit. A communication control method in a communication system used in an electric power system.
The communication system includes a plurality of communication devices that transfer packets including type information and transfer destination identification information by wireless communication.
Wherein the communication device receives Regardless specific packet is the packet containing specific the type information to the identification information, the predetermined time period, discarding discarding processing said packets containing said different type data from said particular packet Steps to take and
A communication control method including a step in which the communication device of the transfer destination transfers the received specific packet by wireless communication including identification information of another transfer destination. A communication control method for a communication device including a communication unit that performs wireless communication in a communication system used in an electric power system.
A step of transferring a packet containing type information and forwarding destination identification information via the communication unit, and
Specific packet is the packet containing specific the type information received via the communication unit regardless of the identification information, when receiving the specific packet for a predetermined period, including said different type data from said particular packet A step of performing a discarding process for discarding the packet, and
A communication control method including, when the specific packet includes identification information of its own communication device, a step of including the identification information of another transfer destination in the received specific packet and transferring the packet via the communication unit.

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