JPWO2020021803A1 - Communication system and monitoring equipment - Google Patents

Abstract

The communication system is a communication system used in a power system and provided with a plurality of monitoring devices, and different terminal identifiers are fixedly assigned to the plurality of monitoring devices, and the plurality of monitoring devices are registered in advance. Information can be transferred to the other monitoring device having the first terminal identifier, and the monitoring device that fails to transfer the information to the other monitoring device is the second terminal registered in advance. Information is transferred to the other monitoring device having the identifier.

Description

The present invention relates to communication systems and monitoring devices.
This application claims priority on the basis of Japanese application Japanese Patent Application No. 2018-139465 filed on July 25, 2018, and incorporates all of its disclosures herein.

As an example of the network system, for example, Japanese Patent No. 6046480 (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 the information. 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 Patent No. 6046480

(1) The communication system of the present disclosure is a communication system used in a power system and provided with a plurality of monitoring devices, wherein different terminal identifiers are fixedly assigned to the plurality of monitoring devices, and the plurality of monitoring devices are fixedly assigned to each of the plurality of monitoring devices. The monitoring device can transfer information to the other monitoring device having the first terminal identifier registered in advance, and the monitoring device that fails to transfer the information to the other monitoring device is registered in advance. The information is transferred to the other monitoring device having the second terminal identifier.

(6) The monitoring device of the present disclosure is the monitoring device used in a power system and in a communication system including a plurality of monitoring devices, and different terminal identifiers are fixedly assigned to the plurality of monitoring devices. A storage unit that stores the terminal identifier and a communication unit that transfers information to the other monitoring device having the first registered terminal identifier, and the communication unit transfers the information to the other monitoring device. If the transfer of the information of the above fails, the information is transferred to the other monitoring device having the second terminal identifier registered in advance.

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 method in which the characteristic processing is a step, or a computer is made to execute such a step. Can be realized as a program for. 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.

Further, one aspect of the present disclosure can be realized not only as a monitoring device provided with such a characteristic processing unit, but also as a method in which the characteristic processing is a step, or such a step can be performed on a computer. It can be realized as a program to be executed. Further, one aspect of the present disclosure can be realized as a semiconductor integrated circuit that realizes a part or all of the monitoring device.

FIG. 1 is a diagram showing a configuration of a communication system according to an embodiment of the present invention. FIG. 2 is a diagram showing an application example of the communication system according to the embodiment of the present invention. FIG. 3 is a block diagram showing a configuration of a monitoring parent device in the communication system according to the embodiment of the present invention. FIG. 4 is a block diagram showing a configuration of a monitor device in the communication system according to the embodiment of the present invention. FIG. 5 is a diagram showing an example of address allocation in the communication system according to the embodiment of the present invention. FIG. 6 is a diagram showing an example of first list information held by a host device in the communication system according to the embodiment of the present invention. FIG. 7 is a diagram showing an example of the second list information held by the host device in the communication system according to the embodiment of the present invention. FIG. 8 is a diagram showing an example of first list information held by the collecting device in the communication system according to the embodiment of the present invention. FIG. 9 is a diagram showing an example of first list information held by the collecting device in the communication system according to the embodiment of the present invention. FIG. 10 is a diagram showing an example of the second list information held by the collecting device, the monitoring parent device, and the monitoring child device in the communication system according to the embodiment of the present invention. FIG. 11 is a diagram showing an example of the second list information held by the collecting device, the monitoring parent device, and the monitoring child device in the communication system according to the embodiment of the present invention. FIG. 12 is a diagram showing an example of a main part of a packet in the communication system according to the embodiment of the present invention. FIG. 13 is a diagram showing an example of a packet used between a host device and a collecting device in the communication system according to the embodiment of the present invention. FIG. 14 is a diagram showing an example of a packet used between a collecting device and a wireless master unit in the communication system according to the embodiment of the present invention. FIG. 15 is a diagram showing an example of wireless packets used between monitoring devices in the communication system according to the embodiment of the present invention. FIG. 16 is a diagram showing an example of a sequence of information transmission in the communication system according to the embodiment of the present invention. FIG. 17 is a diagram showing an example of a method of transferring wireless packets between monitoring devices in the communication system according to the embodiment of the present invention. FIG. 18 is a diagram showing an example of a skip setting table held by each monitoring device in the communication system according to the embodiment of the present invention. FIG. 19 is a diagram showing an example of a skip information table held by each monitoring device in the communication system according to the embodiment of the present invention. FIG. 20 is a diagram showing an example of a sequence in which the monitoring device in the communication system according to the embodiment of the present invention skips the transfer destination of the wireless packet. FIG. 21 is a flowchart defining an example of an operation procedure when the monitoring device in the communication system according to the embodiment of the present invention transfers a wireless packet. FIG. 22 is a diagram showing an example of processing when the monitoring device in the communication system according to the embodiment of the present invention receives radio packets having the same contents a plurality of times. FIG. 23 is a diagram showing an example of a reception history table held by each monitoring device in the communication system according to the embodiment of the present invention. FIG. 24 is a diagram showing an example of a discard condition table held by each monitoring device in the communication system according to the embodiment of the present invention. FIG. 25 is a flowchart showing an example of an operation procedure when the monitoring device in the communication system according to the embodiment of the present invention receives a wireless packet.

[Issues to be solved by this disclosure]
In the network system described in Patent Document 1, each radio station transmits information to an adjacent radio station. As a result, sequential relay communication is performed.

A technique capable of realizing stable operation beyond the technique described in Patent Document 1 is desired.

The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a communication system and a monitoring device capable of realizing more stable operation in an electric power system.

[Effect of the present disclosure]
According to the present disclosure, more stable operation can be realized in the electric power system.

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

(1) The communication system according to the embodiment of the present invention is a communication system used in a power system and provided with a plurality of monitoring devices, and different terminal identifiers are fixedly assigned to the plurality of monitoring devices. The plurality of monitoring devices can transfer information to the other monitoring device having the first terminal identifier registered in advance, and the monitoring device fails to transfer the information to the other monitoring device. Transfers information to the other monitoring device having the second terminal identifier registered in advance.

In this way, different terminal identifiers are fixedly assigned to the plurality of monitoring devices, and the monitoring device transfers the information to another monitoring device having the terminal identifier registered in advance, so that the information can be transmitted with a simple configuration. Can be transmitted. Further, when the monitoring device fails to transfer the information to another monitoring device having the first terminal identifier, the information is transferred to the other monitoring device having the second terminal identifier, for example, in the next stage. Even if a situation occurs in which information cannot be transferred to the monitoring device, the monitoring device in the next stage can be skipped and the information can be transmitted to other monitoring devices in the next and subsequent stages. As a result, it is possible to prevent the transfer of information from being delayed and to transmit information more reliably. Therefore, more stable operation can be realized in the power system.

(2) Preferably, the monitoring device in which the transfer of information to the other monitoring device having the second terminal identifier fails is the other monitoring device having the third terminal identifier registered in advance. Transfer information to.

With such a configuration, for example, when information cannot be transferred even if the next-stage monitoring device is skipped, the monitoring device can be skipped and information can be transmitted to another monitoring device, so that the information can be transmitted more reliably. Can be transmitted.

(3) Preferably, the monitoring device generates a packet including the terminal identifier and the sequence number of the monitoring device as a transmission source and transmits the packet to the other monitoring device, and the monitoring device newly receives the packet. When the terminal identifier and the sequence number included in the packet overlap with the terminal identifier and the sequence number included in the received packet, the newly received packet is discarded.

With such a configuration, for example, it is possible to prevent packets having the same content from being transferred from a plurality of monitoring devices due to packet retransmission, and a large number of unnecessary packets being transmitted between the monitoring devices.

(4) Preferably, the monitoring device transfers measurement information indicating the measurement result of the sensor in the monitoring device and transfers measurement information indicating the measurement result of the sensor in the other monitoring device received from the other monitoring device. Do at least one of the above.

With such a configuration, it is possible to prevent the transfer of the measurement information indicating the measurement result of the sensor from being delayed, and to transmit the measurement information more reliably. Therefore, for example, in a power system, information indicating a lightning strike position or the like to a power transmission facility can be more reliably transmitted.

(5) Preferably, the plurality of monitoring devices include a monitoring parent device that performs multi-hop communication and a plurality of monitoring child devices that can communicate with the monitoring parent device, and the monitoring parent device from each monitoring child device. Each of the monitor devices separately holds the first terminal identifier and the second terminal identifier for each of the upward direction to the device and the downward direction from the monitor parent device to each monitor child device. The first terminal identifier held by each of the monitor devices is exclusive in each of the up direction and the down direction, and each of the monitor devices in the up direction and the down direction. The second terminal identifier held by the monitor is assigned to the monitor device located in the next and subsequent stages of the monitor device to which the first terminal identifier is assigned.

With such a configuration, the physically closest monitoring device can be set as the first transfer destination in the up direction and the down direction along the arrangement direction of the plurality of monitoring devices, so that when the wireless communication environment deteriorates. It is possible to increase the certainty of information transmission.

(6) The monitoring device according to the embodiment of the present invention is the monitoring device in a communication system including a plurality of monitoring devices used in a power system, and different terminal identifiers are fixed to the plurality of monitoring devices. The communication unit includes a storage unit that stores the terminal identifier and a communication unit that transfers information to the other monitoring device having the first registered terminal identifier. If the transfer of information to another monitoring device fails, the information is transferred to the other monitoring device having the second terminal identifier registered in advance.

In this way, different terminal identifiers are fixedly assigned to the plurality of monitoring devices, and the communication unit transfers the information to other monitoring devices having the terminal identifiers registered in advance, so that the information can be transmitted with a simple configuration. Can be transmitted. Further, when the communication unit fails to transfer the information to another monitoring device having the first terminal identifier, the information is transferred to the other monitoring device having the second terminal identifier, for example, in the next stage. Even if a situation occurs in which information cannot be transferred to the monitoring device, the monitoring device in the next stage can be skipped and the information can be transmitted to other monitoring devices in the next and subsequent stages. As a result, it is possible to prevent the transfer of information from being delayed and to transmit information more reliably. Therefore, more stable operation can be realized in the power system.

Hereinafter, embodiments of the present invention 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 invention.

With reference to FIG. 1, the communication system 301 is a communication system used in the power system. 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, detection of a lightning strike position on the power transmission facility and a transmission line. It is used for temperature monitoring and maintenance of power transmission equipment.

The communication system 301 includes one or more monitoring systems T and a host device 181. The monitoring system T includes a collecting device 151 and one or more monitoring devices 101. In the example shown in FIG. 1, the communication system 301 includes two monitoring systems T1 and T2 as the monitoring system T.

The monitoring device 101 has a function of transferring information. As used herein, "transfer" includes, for example, relaying information to a relay destination and transmitting information to a relay destination as a source of information.

Specifically, as a "transfer", the monitoring device 101 transmits, for example, the information received from the other monitoring device 101 to another monitoring device 101 different from the other monitoring device 101, and the self. Information indicating the measurement result of the sensor 111 in the above is transmitted to another monitoring device 101.

The monitoring device 101 is a device having a wireless communication function. The monitoring device 101 performs specific low power wireless communication using, for example, a communication band of the 920 MHz band.

Types of the monitoring device 101 include a monitoring master device 102 having a function as a master unit and a monitoring child device 103 having a function as a slave unit and performing wireless communication with the monitoring master device 102. The monitoring parent device 102 and the plurality of monitoring child devices 103 perform multi-hop communication.

When a plurality of monitoring devices 101 are provided, the plurality of monitoring devices 101 transmit information in series via a wireless transmission line, that is, are connected in series via a wireless transmission line. That is, in the communication system 301, instead of forming a transmission line in which a plurality of monitoring devices 101 are arranged in parallel or in a mesh shape, a wireless transmission line in which a plurality of monitoring devices 101 are arranged in series is formed. In this case, the monitoring system T includes one monitoring parent device 102 and one or more monitoring child devices 103.

The host device 181 is a device capable of communicating with the collecting device 151. The host device 181 can communicate with the collection device 151 via, for example, a mobile phone line.

The collection device 151 receives the information transmitted from the monitoring parent device 102, and transfers the received information to the host device 181. Further, the collecting device 151 receives the information transmitted from the host device 181 and transfers the received information to the monitoring parent device 102.

Hereinafter, the supervisor device 103 side as viewed from the supervisor device 181 may be referred to as the “downstream side”, and the supervisor device 181 side as viewed from the supervisor device 103 may be referred to as the “upstream side”. Further, the direction from the host device 181 to the monitor device 103 may be referred to as a "downward direction", and the direction from the monitor device 103 to the supervisor device 181 may be referred to as an "upward direction".

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

The monitoring parent device 102 acquires measurement information indicating the measurement result of the sensor by itself, and transfers the acquired measurement information to the collection device 151.

Further, the monitoring parent device 102 acquires the measurement information from the monitoring child device 103, and transfers the acquired measurement information to the collecting device 151. Further, the monitoring parent device 102 receives the setting information and the like from the collecting device 151, and transfers the received setting information and the like to the monitoring child device 103.

The monitor device 103 acquires measurement information indicating the measurement information of the sensor by itself, and transfers the acquired measurement information to another monitor device 103 or the monitoring parent device 102 on the upstream side.

Further, the monitor device 103 acquires measurement information from the other monitor device 103 on the downstream side, and transfers the acquired measurement information to the other monitor device 103 or the monitor parent device 102 on the upstream side. Further, the monitor device 103 receives the setting information and the like from the other monitor device 103 on the upstream side or the monitoring parent device 102, and transfers the received setting information and the like to the other monitor device 103 on the downstream side.

When the received information is addressed to itself, the collection device 151 and the monitoring device 101 process the received information without transferring the information.

FIG. 2 is a diagram showing an application example of the communication system according to the embodiment of the present invention.

With reference to FIG. 2, a plurality of monitoring devices 101 are installed at different positions in the power system, for example, at a plurality of positions where information necessary for maintenance of the power system can be detected. Specifically, for example, a plurality of monitoring devices 101 are installed in a plurality of steel towers 2 provided in an electric power system. The overhead ground wire 3 and the transmission line 4 are erected between the adjacent steel towers 2.

The monitoring device 101 may be installed in all the towers 2 of the section to be monitored, or may be installed in a part of the towers 2 of the section to be monitored.

Specifically, the monitoring devices 101 may be installed in a plurality of steel towers 2 installed side by side, for example, every other, every two, or every three. In the example shown in FIG. 2, every other monitoring device 101 is installed. Whether the monitoring device 101 is installed in all the towers 2 or in some of the towers 2 is determined based on, for example, the installation interval of the towers 2.

Further, the monitoring device 101 is not limited to the steel tower 2, and may be installed around the steel tower 2, or may be installed, for example, on a power transmission line 4, an overhead ground wire 3, or the ground.

FIG. 3 is a block diagram showing a configuration of a monitoring parent device in the communication system according to the embodiment of the present invention.

With reference to FIG. 3, the monitoring parent device 102 includes a communication unit 104, a battery 106, a control unit 107, a storage unit 108, and a sensor 111.

The communication unit 104 transmits measurement information indicating the amount of electric charge measured by the sensor 111 of its own monitoring parent device 102 to the collection device 151. The communication unit 104 and the collection device 151 are connected by wire, for example, and perform serial communication with each other.

The battery 106 supplies electric power to the control unit 107, the sensor 111, the communication unit 104, the storage unit 108, and the like.

The control unit 107 controls the operations of the sensor 111, the communication unit 104, and the like. Specifically, for example, the control unit 107 periodically controls the communication unit 104 to be turned on and the communication unit 104 to be turned off when a predetermined time elapses.

As an example, the sensor 111 measures the amount of electric charge of the overhead ground wire 3. The detection target of the sensor 111 is not particularly limited.

Further, when the control unit 107 receives predetermined information indicating an area where a lightning strike is expected, a period during which a lightning strike is expected, and the like from the host device 181 via the communication unit 104 and the collection device 151, the control unit 107 controls, for example, a switch (not shown). As a result, the power supply from the battery 106 to the sensor 111 is started, and the sensor 111 is controlled to transition from the off state to the on state.

The control unit 107 receives the measurement information indicating the amount of electric charge measured by the sensor 111, and outputs the received measurement information to the communication unit 104. Then, when a predetermined time elapses after the sensor 111 is turned on, for example, the control unit 107 stops the power supply from the battery 106 to the sensor 111 by controlling a switch (not shown) to stop the sensor 111. Controls the transition from the on state to the off state.

The storage unit 108 stores a short address or the like, which will be described later, assigned to its own monitoring parent device 102.

With reference to FIG. 1 again, the collecting device 151 transmits the measurement information received from the monitoring parent device 102 to the host device 181.

The host device 181 receives the measurement information from the collection device 151, and performs various calculations based on the received measurement information. For example, the host device 181 receives measurement information indicating the amount of electric charge from the plurality of monitoring devices 101 via the collecting device 151, and distributes the amount of electric charge among the plurality of iron towers 2 based on the amount of electric charge indicated by each received measurement information. Is calculated, and the lightning strike position is estimated based on the calculated distribution of the amount of electric charge.

FIG. 4 is a block diagram showing a configuration of a monitor device in the communication system according to the embodiment of the present invention.

With reference to FIG. 4, the monitor device 103 includes a communication unit 105, a battery 106, a control unit 107, a storage unit 108, and a sensor 111.

The communication unit 105 transmits the measurement information indicating the amount of electric charge measured by the sensor 111 of its own monitor device 103 to the other monitor device 103 or the monitor parent device 102 on the upstream side. When the communication unit 105 receives the measurement information indicating the amount of electric charge from the monitor device 103 located on the downstream side, the communication unit 105 transfers the received measurement information to another monitor device 103 or the monitoring parent device 102 on the upstream side. ..

FIG. 5 is a diagram showing an example of address allocation in the communication system according to the embodiment of the present invention. Hereinafter, a case where the communication system 301 includes the monitor device 103_1 and the monitor device 103_2, which are the monitor devices 103, will be described. The monitor device 103_1 and the monitor device 103_2 are installed in this order from the upstream side.

With reference to FIG. 5, in the communication system 301, the first lower layer which is a lower layer in the communication between the upper device 181 and the collecting device 151 and the lower layer which is the lower layer in the communication between the collecting device 151 and the monitoring device 101. It is different from the lower layer of 2.

Specifically, communication using, for example, a mobile phone line is performed between the host device 181 and the collection device 151. Between the upper device 181 and the collecting device 151, a communication protocol for a mobile phone line, for example, IP is used as the communication protocol of the first lower layer.

On the other hand, for example, serial communication is performed between the collection device 151 and the monitoring parent device 102. A communication protocol for serial communication is used as the communication protocol of the second lower layer between the collection device 151 and the monitoring parent device 102.

Further, between the monitoring parent device 102 and the monitoring child device 103, and between the monitoring child device 103, for example, specific low power wireless communication using a communication band of the 920 MHz band according to the communication standard of IEEE802.1.5 is performed. Between the monitoring parent device 102 and the monitoring child device 103, and between the monitoring child devices 103, the communication protocol for the specific low power wireless communication is used as the communication protocol of the second lower layer.

The upper device 181 holds the first terminal identifier used in the first lower layer, for example, the first list information of the IP address in a storage unit (not shown).

FIG. 6 is a diagram showing an example of first list information held by a host device in the communication system according to the embodiment of the present invention.

With reference to FIG. 6, the first list information TL1 shows the correspondence between the PAN_ID, the IP address of the higher-level device 181 and the IP address of the collection device 151 for each monitoring system T managed by the higher-level device 181.

Further, the upper device 181 holds the second terminal identifier used in the second lower layer, for example, the second list information of the short address in a storage unit (not shown).

FIG. 7 is a diagram showing an example of the second list information held by the host device in the communication system according to the embodiment of the present invention.

With reference to FIG. 7, the second list information TL2 includes a monitoring system number, a PAN_ID, a short address of the host device 181 and a short address of the collecting device 151 for each monitoring system T managed by the host device 181. The correspondence between the short address and tower number of the monitoring parent device 102, the short address and tower number of the monitoring child device 103_1, and the short address and tower number of the monitoring child device 103_2 is shown.

The monitoring system number and tower number indicate the installation location of the tower. As a result, the user can specify the monitoring device 101 or the like in the desired tower for the host device 181 by inputting the monitoring system number and the tower number to the host device 181 and acquire various information. can.

The collection device 151 holds the first terminal identifier used in the first lower layer, for example, the first list information of the IP address in a storage unit (not shown).

Specifically, for example, the first list information is list information of IP addresses assigned to the host device 181 and the collection device 151.

FIG. 8 is a diagram showing an example of first list information held by the collecting device in the communication system according to the embodiment of the present invention. FIG. 8 shows an example of the first list information held by the collection device 151 belonging to the monitoring system T1.

With reference to FIG. 8, the first list information SL1 shows the correspondence between the PAN_ID of the monitoring system T1, the IP address of the host device 181 and the IP address of the collecting device 151.

FIG. 9 is a diagram showing an example of first list information held by the collecting device in the communication system according to the embodiment of the present invention. FIG. 9 shows an example of the first list information held by the collection device 151 belonging to the monitoring system T2.

With reference to FIG. 9, the first list information SL1 shows the correspondence between the PAN_ID of the monitoring system T2, the IP address of the higher-level device 181 and the IP address of the collecting device 151.

Further, the collecting device 151 holds the second terminal identifier used in the second lower layer, for example, the second list information of the short address in a storage unit (not shown).

Specifically, for example, the second list information is list information of short addresses given to the host device 181, the collecting device 151, the monitoring parent device 102, and the monitoring child device 103.

FIG. 10 is a diagram showing an example of second list information held by the collecting device and the monitoring device in the communication system according to the embodiment of the present invention. FIG. 10 shows an example of the second list information held by the collection device 151 belonging to the monitoring system T1, the monitoring parent device 102, and the monitoring child device 103.

With reference to FIG. 10, the second list information SL2 contains the monitoring system number of the monitoring system T1, the PAN_ID, the short address of the host device 181 and the short address of the collecting device 151, and the short address of the monitoring parent device 102. The correspondence between the tower number, the short address and tower number of the monitor device 103_1, and the short address and tower number of the monitor device 103_2 is shown.

FIG. 11 is a diagram showing an example of the second list information held by the collecting device and the monitoring device in the communication system according to the embodiment of the present invention. FIG. 11 shows an example of the second list information held by the collection device 151 belonging to the monitoring system T2, the monitoring parent device 102, and the monitoring child device 103.

With reference to FIG. 11, the second list information SL2 contains the monitoring system number, the PAN_ID, the short address of the host device 181 and the short address of the collecting device 151, and the short address of the monitoring parent device 102 of the monitoring system T2. The correspondence between the tower number, the short address and tower number of the monitor device 103_1, and the short address and tower number of the monitor device 103_2 is shown.

As described above, in the communication system 301, different first terminal identifiers, for example, IP addresses are fixedly assigned to the collection device 151 and the host device 181.

Further, different second terminal identifiers, for example, short addresses, are fixedly assigned to the collection device 151, the monitoring parent device 102, the monitoring child device 103, and the host device 181.

Further, different network identifiers, for example, PAN_ID (Personal Area Network Identification) are fixedly assigned to the monitoring systems T1 and T2.

In the communication system 301, the monitoring parent device 102, the plurality of monitoring child devices 103, the collecting device 151, and the higher-level device 181 use the second terminal identifier as the source address and the destination address, for example, the source short address and the destination short address. Send and receive packets stored in each.

FIG. 12 is a diagram showing an example of a main part of a packet in the communication system according to the embodiment of the present invention.

With reference to FIG. 12, the packet transmitted between the host device 181 and the collection device 151 includes a TCP / IP header, a routing header, an application header and an application payload. TCP / IP headers and routing headers are used for lower layer communication, and application headers and application payloads are used for higher layer communication. The packet may include data other than the contents shown in FIG.

The host device 181 can recognize the contents of the application header and the application payload. On the other hand, the collecting device 151 cannot recognize the contents of the application header and the application payload.

The packet transmitted between the collecting device 151 and the monitoring parent device 102 includes a serial header, a routing header, an application header, and an application payload. Serial headers and routing headers are used for lower layer communication, and application headers and application payloads are used for higher layer communication.

The collecting device 151 and the monitoring parent device 102 can recognize the contents of the serial header and the routing header, but cannot recognize the contents of the application header and the application payload.

The packet transmitted between the monitoring parent device 102 and the monitoring child device 103 is a radio packet and includes a radio header, a routing header, an application header, and an application payload. Radio headers and routing headers are used for lower layer communication, and application headers and application payloads are used for higher layer communication.

The monitoring parent device 102 and the monitoring child device 103 can recognize the contents of the radio header and the routing header, but cannot recognize the contents of the application header and the application payload.

The packet transmitted between the observer devices 103 is a radio packet and includes a radio header, a routing header, an application header, and an application payload. Radio headers and routing headers correspond to lower layers, and application headers and application payloads correspond to higher layers.

The observer device 103 can recognize the contents of the radio header and the routing header, but cannot recognize the contents of the application header and the application payload.

FIG. 13 is a diagram showing an example of a packet used between a host device and a collecting device in the communication system according to the embodiment of the present invention. FIG. 13 shows the format of the IP packet.

With reference to FIG. 13, the IP packet includes a TCP / IP header and a routing packet stored in the payload.

The TCP / IP header includes, for example, a "destination IP address" and a "source IP address".

The routing packet includes, for example, a routing header and an application packet stored in the payload.

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

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

The application payload includes target information such as measurement information. The target information includes, for example, information used for maintenance of a power system such as a power transmission facility. Specifically, when the monitoring device 101 is installed in the steel tower 2, the target information includes, for example, measurement information indicating the amount of charge used for detecting the position of a lightning strike on the power transmission facility, and the temperature used for temperature monitoring of the power transmission line 4. The measurement information indicating the inclination of the steel tower 2, the measurement information indicating the inclination of the steel tower 2, the measurement information indicating the depth of snow on the ground, and the like are included.

When the monitoring device 101 is installed on the power transmission line 4, the target information includes, for example, measurement information indicating the amount of charge used for detecting the position of a lightning strike on the power transmission facility, and the temperature used for temperature monitoring of the power transmission line 4. It includes the measurement information to be shown, the measurement information to show the inclination due to the slack of the transmission line 4, and the like.

When the monitoring device 101 is installed on the overhead ground wire 3, the target information is, for example, measurement information indicating the amount of charge used for detecting the position of a lightning strike on the power transmission facility, and temperature monitoring of the overhead ground wire 3. It includes measurement information indicating temperature, measurement information indicating inclination due to slack of the overhead ground wire 3, and the like.

When the monitoring device 101 is installed on the ground around the steel tower 2, the target information indicates, for example, measurement information indicating the inclination of the ground, measurement information indicating vibration of the ground, or the depth of snow cover on the ground. Includes measurement information, etc.

The detection target of the sensor 111 and the type of the sensor 111 in the monitoring device 101 are appropriately set according to the type of the target information.

FIG. 14 is a diagram showing an example of a packet used between a collecting device and a wireless master device in the communication system according to the embodiment of the present invention. FIG. 14 shows the format of a serial packet transmitted by serial communication.

With reference to FIG. 14, the serial packet includes a serial header and a routing packet stored in the payload.

The serial header is a header used for serial communication. The routing packet has the same contents as the routing packet shown in FIG.

FIG. 15 is a diagram showing an example of wireless packets used between monitoring devices in the communication system according to the embodiment of the present invention. FIG. 15 shows the format of the radio packet transmitted by the specified low power radio communication of 920 MHz.

With reference to FIG. 15, the radio packet includes a radio header and a routing packet stored in the payload.

The wireless header is a header used for specific low power wireless communication. The routing packet is different from the routing packet shown in FIG. 13 in that the sequence number is added to the routing header.

The sequence number is basically different for each wireless packet. When the monitoring device 101 retransmits the wireless packet, the same sequence number is assigned to the wireless packet before and after the retransmission.

[Operation flow]
Each device in the communication system 301 includes a computer including a memory, and an arithmetic processing unit such as a CPU in the computer reads a program including a part or all of each step of the following sequence diagram or flowchart from the memory. Execute. 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.

FIG. 16 is a diagram showing an example of a sequence of information transmission in the communication system according to the embodiment of the present invention.

In FIG. 16, eight transmission examples 1 to 8 of packets in the higher-level device 181 and the monitoring system T1, that is, between the higher-level device 181, the collecting device 151, the monitoring parent device 102, and the two monitor device devices 103_1 and 103_2 are the same. An example of execution in order is shown.

In the transmission example 1 for transmitting information in the downlink direction, the host device 181 transmits an IP packet including the setting information of the collection device 151 to the collection device 151.

This IP packet contains "0x0001" as the destination PAN_ID, "192.168.1.3" as the destination IP address, and "192.168.1.2" as the source IP address, and transmits. The destination short address includes "0xFFFD", and the source short address includes "0xFFFE". This IP packet does not include the source PAN_ID.

Next, the collecting device 151 receives the IP packet from the host device 181 and processes it.

In the transmission example 2 for transmitting information in the upstream direction, the collection device 151 transmits an IP packet including measurement information and the like to the host device 181.

This IP packet contains "0x0001" as the source PAN_ID, "192.168.1.2" as the destination IP address, and "192.168.1.3" as the source IP address, and transmits. The destination short address includes "0xFFFE", and the source short address includes "0xFFFD". This IP packet does not include the destination PAN_ID.

Next, the host device 181 receives the IP packet from the collecting device 151 and processes it.

In the transmission example 3 for transmitting information in the downlink direction, the host device 181 transmits an IP packet including the setting information of the monitoring parent device 102 to the collecting device 151.

This IP packet contains "0x0001" as the destination PAN_ID, "192.168.1.3" as the destination IP address, and "192.168.1.2" as the source IP address, and transmits. "0x0000" is included as the destination short address, and "0xFFFE" is included as the source short address. This IP packet does not include the source PAN_ID.

Next, when the collecting device 151 receives the IP packet from the host device 181, the collecting device 151 deletes the TCP / IP header of the received IP packet, creates a serial packet by adding the serial header, and monitors the created serial packet. It is transmitted to the parent device 102.

This serial packet includes "0x0001" as the destination PAN_ID, "0x0000" as the destination short address, and "0xFFFE" as the source short address. This serial packet does not include the source PAN_ID.

Next, the monitoring parent device 102 receives the serial packet from the collecting device 151 and processes it.

In the transmission example 4 for transmitting information in the upstream direction, the monitoring parent device 102 transmits a serial packet including measurement information and the like to the collecting device 151.

This serial packet includes "0x0001" as the source PAN_ID, "0xFFFE" as the destination short address, and "0x0000" as the source short address. This serial packet does not include the destination PAN_ID.

Next, when the collecting device 151 receives the serial packet from the monitoring parent device 102, the collecting device 151 deletes the serial header of the received serial packet, creates an IP packet by adding a TCP / IP header, and creates the created IP packet. It is transmitted to the host device 181.

This IP packet includes "0x0001" as the source PAN_ID, "0xFFFE" as the destination short address, and "0x0000" as the source short address. This IP packet does not include the destination PAN_ID.

Next, the host device 181 receives the IP packet from the collecting device 151 and processes it.

In the transmission example 5 for transmitting information in the downlink direction, the host device 181 transmits an IP packet including the setting information of the monitor device 103_2 to the collection device 151.

This IP packet contains "0x0001" as the destination PAN_ID, "192.168.1.3" as the destination IP address, and "192.168.1.2" as the source IP address, and transmits. "0x0002" is included as the destination short address, and "0xFFFE" is included as the source short address. This IP packet does not include the source PAN_ID.

Next, when the collecting device 151 receives the IP packet from the host device 181, the collecting device 151 deletes the TCP / IP header of the received IP packet, creates a serial packet by adding the serial header, and monitors the created serial packet. It is transmitted to the parent device 102.

This serial packet includes "0x0001" as the destination PAN_ID, "0x0002" as the destination short address, and "0xFFFE" as the source short address. This serial packet does not include the source PAN_ID.

Next, when the monitoring parent device 102 receives the serial packet from the collecting device 151, the monitoring parent device 102 deletes the serial header of the received serial packet, creates a wireless packet by adding the wireless header, and monitors the created wireless packet. It is transmitted to the device 103_1.

This radio packet contains "0x0001" as the destination PAN_ID, "0x0001" as the destination radio address, "0x0000" as the source radio address, "0x0002" as the destination short address, and the source. Includes "0xFFFE" as the short address. This radio packet does not include the source PAN_ID.

Next, when the monitor child device 103_1 receives the radio packet from the monitoring parent device 102, the monitor child device 103_1 creates and creates a new radio packet by deleting the radio header of the received radio packet and adding a new radio header. The wireless packet is transmitted to the monitor device 103_2.

This radio packet includes "0x0001" as the destination PAN_ID, "0x0002" as the destination radio address, "0x0001" as the source radio address, "0x0002" as the destination short address, and the source. Includes "0xFFFE" as the short address. This radio packet does not include the source PAN_ID.

Next, the monitor device 103_2 receives and processes the wireless packet from the monitor device 103_1.

In transmission example 6 for transmitting information in the upstream direction, the monitor device 103_2 transmits a wireless packet including measurement information and the like to the monitor device 103_1.

This radio packet includes "0x0001" as the source PAN_ID, "0x0001" as the destination radio address, "0x0002" as the source radio address, "0xFFFE" as the destination short address, and the source. Includes "0x0002" as the short address. This radio packet does not include the destination PAN_ID.

Next, when the monitor device 103_1 receives the radio packet from the monitor device 103_2, the monitor device 103_1 creates and creates a new radio packet by deleting the radio header of the received radio packet and adding a new radio header. The wireless packet is transmitted to the monitoring parent device 102.

This radio packet contains "0x0001" as the source PAN_ID, "0x0000" as the destination radio address, "0x0001" as the source radio address, "0xFFFE" as the destination short address, and the source. Includes "0x0002" as the short address. This radio packet does not include the destination PAN_ID.

Next, when the monitoring parent device 102 receives the wireless packet from the monitoring child device 103_1, the monitoring parent device 102 deletes the wireless header of the received wireless packet, creates a serial packet by adding the serial header, and collects the created serial packet. It transmits to the device 151.

This serial packet includes "0x0001" as the source PAN_ID, "0xFFFE" as the destination short address, and "0x0002" as the source short address. This serial packet does not include the destination PAN_ID.

Next, when the collecting device 151 receives the serial packet from the monitoring parent device 102, the collecting device 151 deletes the serial header of the received serial packet, creates an IP packet by adding a TCP / IP header, and creates the created IP packet. It is transmitted to the host device 181.

This IP packet contains "0x0001" as the source PAN_ID, "192.168.1.2" as the destination IP address, and "192.168.1.3" as the source IP address, and transmits. "0xFFFE" is included as the destination short address, and "0x0002" is included as the source short address. This IP packet does not include the destination PAN_ID.

Next, the host device 181 receives the IP packet from the collecting device 151 and processes it.

In the transmission example 7 for transmitting information in the downlink direction, the monitoring parent device 102 transmits a wireless packet including information for setting or the like to the monitoring child device 103_1 to the monitoring child device 103_1.

This radio packet contains "0x0001" as the destination PAN_ID, "0x0001" as the source PAN_ID, "0x0001" as the destination radio address, "0x0000" as the source radio address, and the destination short. The address includes "0x0002" and the source short address includes "0x0000".

Next, when the monitor child device 103_1 receives the radio packet from the monitoring parent device 102, the monitor child device 103_1 creates and creates a new radio packet by deleting the radio header of the received radio packet and adding a new radio header. The wireless packet is transmitted to the monitor device 103_2.

This radio packet contains "0x0001" as the destination PAN_ID, "0x0001" as the source PAN_ID, "0x0002" as the destination radio address, "0x0001" as the source radio address, and the destination short. The address includes "0x0002" and the source short address includes "0x0000".

Next, the monitor device 103_2 receives and processes the wireless packet from the monitor device 103_1.

In transmission example 8 for transmitting information in the upstream direction, the monitor device 103_2 transmits a radio packet including information such as measurement information to the monitor device 103_1.

This radio packet contains "0x0001" as the destination PAN_ID, "0x0001" as the source PAN_ID, "0x0001" as the destination radio address, "0x0002" as the source radio address, and the destination short. The address includes "0x0000" and the source short address includes "0x0002".

Next, when the monitor device 103_1 receives the radio packet from the monitor device 103_2, the monitor device 103_1 creates and creates a new radio packet by deleting the radio header of the received radio packet and adding a new radio header. The wireless packet is transmitted to the monitoring parent device 102.

This radio packet contains "0x0001" as the destination PAN_ID, "0x0001" as the source PAN_ID, "0x0000" as the destination radio address, "0x0001" as the source radio address, and the destination short. The address includes "0x0000" and the source short address includes "0x0002".

Next, the monitoring parent device 102 receives and processes the wireless packet from the monitoring child device 103_1.

In the communication system 301, the packet transmitted between the devices includes the PAN_ID. As a result, for example, in the work of attaching the monitoring device 101 to the steel tower 2, even if the monitoring device 101 having an erroneous PAN_ID is attached, for example, the host device 181 can recognize the error. The communication system 301 may have a configuration in which the packet transmitted between the devices does not include the PAN_ID.

Hereinafter, processing when the transfer of the wireless packet fails between the monitoring devices 101 will be described.

FIG. 17 is a diagram showing an example of a method of transferring wireless packets between monitoring devices in the communication system according to the embodiment of the present invention. Here, an example in which the monitoring device 101_0, the monitoring device 101_1, the monitoring device 101_2, the monitoring device 101_3, and the monitoring device 101_4, which are the five monitoring devices 101, are arranged in series in this order will be described.

The direction from the monitoring device 101_0 to the monitoring device 101_4 may be an upward direction or a downward direction.

The monitoring device 101 shown in FIG. 17 is the monitoring parent device 102 shown in FIG. 3 or the monitoring child device 103 shown in FIG. For example, the monitoring device 101_0 may be the monitoring parent device 102, the monitoring devices 101_1 to 101_4 may be the monitoring child device 103, the monitoring devices 101_0 to 101_4 may be the monitoring child device 103, and monitoring. The device 101_4 may be the monitoring parent device 102, and the monitoring devices 101_0 to 101_3 may be the monitoring child device 103.

Hereinafter, each of the communication unit 104 and the communication unit 105 will also be referred to as a communication unit 50.

With reference to FIGS. 3 and 4 again, the communication unit 50 changes the destination short address when the wireless packet is retransmitted. Specifically, the communication unit 50 changes the destination short address in the routing header of the wireless packet to the short address of the monitoring device 101 one or more ahead of the monitoring device 101 having the destination short address.

Further, when the own monitoring device 101 is the source of the wireless packet, the communication unit 50 stores the destination short address and its own source short address in the wireless header, and the transmission header contains the destination short address and its own. A radio packet containing a source short address and a sequence number is created, and the radio packet is transmitted.

Further, when the communication unit 50 receives a wireless packet from another monitoring device 101, the communication unit 50 stores the received wireless packet in the storage unit 108.

With reference to FIG. 17 again, each of the five monitoring devices 101 is assigned a terminal identifier, specifically, a short address in advance. Specifically, the short addresses assigned to the monitoring device 101_0, the monitoring device 101_1, the monitoring device 101_2, the monitoring device 101_3, and the monitoring device 101_4 are, for example, 0x0000, 0x0001, 0x0002, 0x0003, and 0x0004, respectively.

The communication unit 50 in each monitoring device 101 can transfer a wireless packet to another monitoring device 101 having a first short address registered in advance by itself, for example, in each of the up direction and the down direction. Specifically, the first short address is a short address of another monitoring device 101 of the next stage or later, for example, a short address of the monitoring device 101 of the next stage.

Specifically, for example, the communication unit 50 in each monitoring device 101 transfers a wireless packet to the next-stage monitoring device 101, that is, the adjacent monitoring device 101.

For example, the monitoring device 101_0 having a short address of 0x0000 transfers the radio packet to the monitoring device 101_1 having a short address of 0x0001. The monitoring device 101_1 receives the wireless packet from the monitoring device 101_1 and transfers the wireless packet to the monitoring device 101_2 having a short address of 0x0002.

More specifically, the communication unit 50 in the monitoring device 101_1 deletes the radio header of the radio packet received from the monitoring device 101_1. The communication unit 50 in the monitoring device 101_1 refers to the second list information SL2 shown in FIG. 10 or 11, adds a radio header having a destination short address of 0x0002, and creates a new radio packet. Then, the communication unit 50 in the monitoring device 101_1 transfers the created wireless packet to the monitoring device 101_2.

The communication unit 50 in each monitoring device 101 has a second short address stored in advance in itself when the transfer of information to the other monitoring device 101 fails, for example, in each of the up direction and the down direction. Information is transferred to the monitoring device 101 of the above, for example, another monitoring device 101 of the next stage or later having a second short address.

The second short address is, for example, the short address of the monitoring device 101 in the next stage. That is, for example, in each of the up direction and the down direction, the second short address held by the monitoring device 101 is a monitoring device 101 located after the next stage of the monitoring device 101 to which the first short address is assigned, for example. It is assigned to the monitoring device 101 located in the next stage. That is, when the monitoring device 101 fails to transfer the information to the other monitoring device 101, the monitoring device 101 skips the transfer destination of the wireless packet.

Specifically, for example, when the communication unit 50 in each monitoring device 101 fails to transfer the wireless packet to the monitoring device 101 in the next stage, the communication unit 50 transfers the wireless packet to the monitoring device 101 in the next stage.

The second short address held by the monitoring device 101 in each of the up direction and the down direction may be the monitoring device 101 located in the next stage of the monitoring device 101 to which the first short address is assigned. However, the monitoring device 101 may be located in the next and subsequent stages.

Further, when the communication unit 50 in each monitoring device 101 fails to transfer information to another monitoring device 101 at the skip destination in each of the up direction and the down direction, for example, a third short circuit stored in advance in the communication unit 50 itself. Information is transferred to another monitoring device 101 having an address, for example, to yet another monitoring device 101 of the next stage or later.

The third short address is, for example, the short address of the next monitoring device 101 in the next stage. That is, for example, in each of the up direction and the down direction, the third short address held by the monitoring device 101 is assigned to the monitoring device 101 located next to the monitoring device 101 to which the second short address is assigned. There is. That is, when the monitoring device 101 fails to transfer the information to another monitoring device 101 at the skip destination, the monitoring device 101 further skips the forwarding destination of the wireless packet.

Specifically, for example, when the communication unit 50 in each monitoring device 101 fails to transfer the wireless packet to the monitoring device 101 in the next stage, the communication unit 50 transfers the wireless packet to the next monitoring device 101 in the next stage.

In FIG. 17, when the communication unit 50 in the monitoring device 101_2 fails to transfer the packet to the monitoring device 101_3, the communication unit 50 transfers the wireless packet to the monitoring device 101_4.

FIG. 18 is a diagram showing an example of a skip setting table held by each monitoring device in the communication system according to the embodiment of the present invention.

With reference to FIG. 18, the skip setting table Tbs contains information related to the skip operation. The information related to the skip operation is, for example, the allowable waiting time Tmax, the allowable retransmission number Sdmax, the allowable skip number Skmax, and the initial skip number. The storage unit 108 in each monitoring device 101 stores the skip setting table Tbs.

The allowable standby time Tmax is the maximum time during which a wireless packet can be waited until it receives a wireless packet indicating ACK (Acknowledgment) from the transfer destination monitoring device 101 after the wireless packet is transferred. When the allowable standby time Tmax elapses, the communication unit 50 in the monitoring device 101 of the transmission source determines that the transfer of the wireless packet has failed. Hereinafter, the radio packet indicating ACK may be simply referred to as "ACK".

The allowable retransmission number Sdmax is the maximum number of times that the transfer can be retried when the communication unit 50 in the monitoring device 101 determines that the transfer has failed.

When the communication unit 50 in the monitoring device 101 of the transmission source determines that the transfer of the wireless packet has failed, the communication unit 50 retries the transfer, that is, retransmits the wireless packet, up to the allowable number of retransmissions Sdmax.

The allowable skip number Skmax is the maximum number at which the monitoring device 101 can be skipped. The allowable skip number Skmax depends on the number of monitoring devices 101 up to the terminal monitoring device 101 in the transmission direction of the wireless packet when viewed from the monitoring device 101.

The initial skip number Sk1 is an initial value of the skip number. The initial skip number Sk1 is set to, for example, 0.

With reference to FIG. 17 again, it is assumed that, for example, the direction from the monitoring device 101_4 to the monitoring device 101_0 is the upward direction, and the direction from the monitoring device 101_0 to the monitoring device 101_4 is the downward direction. Further, for example, it is assumed that the monitoring devices 101_1 to 101_4 are the monitoring child devices 103 and the monitoring device 101_0 is the monitoring parent device 102.

In the communication system 301, each monitoring device 101 holds one or more short addresses separately for the up direction and the down direction.

The storage unit 108 of each monitoring device 101 has an address area for holding one or more short addresses separately in the up direction and the down direction, and a flag area indicating the validity of the short address in the address area. ing.

Specifically, for example, the monitoring device 101_4 located at the start point in the up direction holds a first short address, a second short address, and a third short address in the up direction. Further, the monitoring device 101_4 located at the end point in the downward direction does not hold the first short address, the second short address, and the third short address in the downward direction.

For the address area in the storage unit 108 of the monitoring device 101_4, three stored areas for storing the first short address, the second short address, and the third short address in the upstream direction, and the short address are added. It has a plurality of unstored areas that can be stored.

The flag area in the storage unit 108 of the monitoring device 101_4 has three areas corresponding to the above-mentioned three stored areas and a plurality of areas corresponding to the above-mentioned plurality of unstored areas. In the above three areas, a flag "1" indicating that the corresponding short address is valid is stored. On the other hand, a flag "0" indicating that the corresponding short address is not stored or the corresponding short address is invalid is stored in the plurality of areas.

Further, the monitoring device 101_3 located at the next stage of the start point in the up direction holds the first short address, the second short address, and the third short address in the up direction. Further, the monitoring device 101_3 located in front of the end point in the downward direction holds the first short address in the downward direction, and does not hold the second short address and the third short address in the downward direction.

The address area in the storage unit 108 of the monitoring device 101_3 stores four short addresses, a first short address in the up direction, a second short address and a third short address, and a first short address in the down direction, respectively. It has a stored area and a plurality of unstored areas in which a short address can be added and stored.

The flag area in the storage unit 108 of the monitoring device 101_3 has four areas corresponding to the above-mentioned four stored areas and a plurality of areas corresponding to the above-mentioned plurality of unstored areas. In the above four areas, a flag "1" indicating that the corresponding short address is valid is stored. On the other hand, a flag "0" indicating that the corresponding short address is not stored or the corresponding short address is invalid is stored in the plurality of areas.

Further, the monitoring device 101_2 located in the stage before the end point in the up direction holds the first short address and the second short address in the up direction, and holds the third short address in the up direction. do not have. Further, the monitoring device 101_2 located in the stage before the end point in the downward direction holds the first short address and the second short address in the downward direction, and holds the third short address in the downward direction. do not have.

The address area in the storage unit 108 of the monitoring device 101_2 stores four first short addresses and second short addresses in the up direction, and four first short addresses and second short addresses in the down direction, respectively. It has a stored area and a plurality of unstored areas in which a short address can be added and stored.

The flag area in the storage unit 108 of the monitoring device 101_2 has four areas corresponding to the above-mentioned four stored areas and a plurality of areas corresponding to the above-mentioned plurality of unstored areas. In the above four areas, a flag "1" indicating that the corresponding short address is valid is stored. On the other hand, a flag "0" indicating that the corresponding short address is not stored or the corresponding short address is invalid is stored in the plurality of areas.

Further, the monitoring device 101_1 located in front of the end point in the up direction holds the first short address in the up direction, and does not hold the second short address and the third short address in the up direction. Further, the monitoring device 101_1 located at the next stage of the start point in the downward direction holds the first short address, the second short address, and the third short address in the downward direction.

The address area in the storage unit 108 of the monitoring device 101_1 stores four short addresses in the ascending direction, the first short address in the descending direction, the second short address, and the third short address, respectively. It has a stored area and a plurality of unstored areas in which a short address can be added and stored.

The flag area in the storage unit 108 of the monitoring device 101_1 has four areas corresponding to the above-mentioned four stored areas and a plurality of areas corresponding to the above-mentioned plurality of unstored areas. In the above four areas, a flag "1" indicating that the corresponding short address is valid is stored. On the other hand, a flag "0" indicating that the corresponding short address is not stored or the corresponding short address is invalid is stored in the plurality of areas.

Further, the monitoring device 101_0 located at the end point in the up direction does not hold the first short address, the second short address, and the third short address in the up direction. Further, the monitoring device 101_0 located at the starting point in the downward direction holds the first short address, the second short address, and the third short address in the downward direction.

For the address area in the storage unit 108 of the monitoring device 101_0, three stored areas for storing the first short address, the second short address, and the third short address in the downlink direction, and the short address are added. It has a plurality of unstored areas that can be stored.

The flag area in the storage unit 108 of the monitoring device 101_0 has three areas corresponding to the above-mentioned three stored areas and a plurality of areas corresponding to the above-mentioned plurality of unstored areas. In the above three areas, a flag "1" indicating that the corresponding short address is valid is stored. On the other hand, a flag "0" indicating that the corresponding short address is not stored or the corresponding short address is invalid is stored in the plurality of areas.

Further, in each of the up direction and the down direction, the first short address of each monitoring device 101 holding the first short address is exclusive, that is, different from each other.

Further, in each of the up direction and the down direction, the second short address of each monitoring device 101 holding the second short address is exclusive, that is, different from each other.

Further, in each of the up direction and the down direction, the third short address of each monitoring device 101 holding the third short address is exclusive, that is, different from each other.

FIG. 19 is a diagram showing an example of a skip information table held by each monitoring device in the communication system according to the embodiment of the present invention. FIG. 19 shows an example of the skip information table held by the monitoring device 101_2.

With reference to FIG. 19, the skip information table Tbsk shows the correspondence between the number of skips and the short addresses of the other monitoring devices 101 in each of the up direction and the down direction. For example, the skip number 0 corresponds to the short address of the adjacent monitoring device 101, that is, the next-stage monitoring device 101, and the skip number 1 corresponds to the short address of the two adjacent monitoring devices 101, that is, the next-stage monitoring device 101. is doing. The storage unit 108 in each monitoring device 101 stores the skip information table Tbsk.

FIG. 20 is a diagram showing an example of a sequence in which the monitoring device in the communication system according to the embodiment of the present invention skips the transfer destination of the wireless packet.

With reference to FIG. 20, first, the monitoring device 101_0 transfers the wireless packet to the monitoring device 101_1 (step S101).

Next, when the monitoring device 101_1 receives the wireless packet from the monitoring device 101_1, the monitoring device 101_1 transmits an ACK to the monitoring device 101_0 (step S103).

Next, the monitoring device 101_1 transfers the wireless packet to the monitoring device 101_2 (step S105).

Next, when the monitoring device 101_2 receives the wireless packet from the monitoring device 101_1, the monitoring device 101_2 transmits an ACK to the monitoring device 101_1 (step S107).

Next, the monitoring device 101_2 transfers the wireless packet to the monitoring device 101_3 (step S109).

Next, when the monitoring device 101_2 fails to transfer the wireless packet, the monitoring device 101_2 retransmits the wireless packet to the monitoring device 101_3 (step S111).

Next, when the monitoring device 101_2 fails to transfer the wireless packet again, the monitoring device 101_2 stops the transfer of the packet to the monitoring device 101_3 and changes the forwarding destination of the wireless packet to the monitoring device 101_4. That is, the monitoring device 101_2 skips one transfer destination of the wireless packet (step S113).

Next, the monitoring device 101_2 transfers the wireless packet to the monitoring device 101_4 (step S114).

FIG. 21 is a flowchart defining an example of an operation procedure when the monitoring device in the communication system according to the embodiment of the present invention transfers a wireless packet. Here, as an example of the monitoring device 101, the operation when the monitoring device 101_2 in FIG. 20 uses the skip information table Tbsk shown in FIG. 19 will be described.

With reference to FIG. 21, first, the communication unit 50 in the monitoring device 101_2 transfers the wireless packet to the monitoring device 101 in the next stage. Specifically, the communication unit 50 receives the radio packet including the short address of the monitoring device 101_0 and the sequence number as the transmission source from the monitoring device 101_1, and transfers the radio packet to the monitoring device 101_3 in the next stage in the downlink direction. (Step S201).

Next, the communication unit 50 confirms whether or not ACK has been received from the monitoring device 101_3 (step S203).

When the communication unit 50 receives the ACK from the monitoring device 101_3 (YES in step S203), the communication unit 50 ends the wireless packet transfer process.

On the other hand, when the communication unit 50 has not received the ACK from the monitoring device 101_3 (NO in step S203), the communication unit 50 confirms whether or not the allowable standby time Tmax has elapsed since the wireless packet was transferred (step S205).

When the allowable standby time Tmax has not elapsed since the wireless packet was transferred (NO in step S205), the communication unit 50 waits until ACK is received from the monitoring device 101_3 (step S203).

On the other hand, when the allowable standby time Tmax elapses after the wireless packet is transferred (YES in step S205), the communication unit 50 determines whether the number of retransmissions of the wireless packet, that is, the number of transfer retries is equal to or less than the allowable retransmission number Sdmax. Check if. The allowable number of retransmissions Sdmax is, for example, once (step S207).

When the number of retransmissions of the wireless packet is equal to or less than the allowable number of retransmissions Sdmax (YES in step S207), the communication unit 50 retransmits the wireless packet (step S201).

On the other hand, when the number of retransmissions of the wireless packet exceeds the allowable number of retransmissions Sdmax (NO in step S207), the communication unit 50 confirms whether or not the number of skips is equal to or less than the allowable number of skips Skmax (step S209).

When the number of skips exceeds the allowable number of skips Skmax (NO in step S209), the communication unit 50 cancels the wireless packet transfer process.

On the other hand, when the number of skips is equal to or less than the allowable number of skips Skmax (YES in step S209), the communication unit 50 updates the number of skips by adding 1 to the current number of skips (step S211).

Next, the communication unit 50 changes the transfer destination of the wireless packet. Specifically, the communication unit 50 refers to the skip information table Tbsk and changes the destination short address in the routing header of the wireless packet to the short address corresponding to the number of skips after the update, thereby causing the current transfer. The previous monitoring device 101 is set as a new transfer destination (step S213).

Here, the operation of the communication unit 50 skipping the transfer destination of the wireless packet by referring to the skip information table Tbsk in the downlink transfer has been described, but the communication unit 50 skips in the uplink transfer. The same applies to the operation of skipping the transfer destination of the wireless packet by referring to the information table Tbsk.

Further, the communication unit 50 may or may not return the skip number to the initial value 0 after a lapse of a predetermined time, for example, after transmitting the wireless packet, or may not return the skip number to the initial value 0.

Hereinafter, processing when the monitoring device 101 receives the radio packet having the same content a plurality of times will be described.

FIG. 22 is a diagram showing an example of processing when the monitoring device in the communication system according to the embodiment of the present invention receives radio packets having the same contents a plurality of times. In the example shown in FIG. 22, three monitoring devices 101_0, 101_1 and 101_2 are typically shown.

With reference to FIG. 22, first, the communication unit 50 in the monitoring device 101_0 transfers the wireless packet to the monitoring device 101_1 (step S401).

Next, when the communication unit 50 in the monitoring device 101_1 receives the wireless packet from the monitoring device 101_1, the communication unit 50 transmits an ACK to the monitoring device 101_1 (step S403).

Next, the communication unit 50 in the monitoring device 101_1 transfers the wireless packet to the monitoring device 101_2 (step S405).

Next, when the communication unit 50 in the monitoring device 101_2 receives the wireless packet from the monitoring device 101_1, the communication unit 50 transmits an ACK to the monitoring device 101_1 (step S407).

Next, if the communication unit 50 in the monitoring device 101_1 cannot receive the ACK within the allowable standby time Tmax after transferring the wireless packet to the monitoring device 101_1, the communication unit 50 retransmits the wireless packet to the monitoring device 101_1 (step S409). ..

Next, when the communication unit 50 in the monitoring device 101_1 receives the wireless packet from the monitoring device 101_1, the communication unit 50 transmits an ACK to the monitoring device 101_1 (step S411).

Next, when the communication unit 50 in the monitoring device 101_1 cannot receive the ACK within the allowable standby time Tmax after transferring the wireless packet to the monitoring device 101_1, the communication unit 50 changes the forwarding destination of the wireless packet, that is, the wireless packet. One transfer destination is skipped (step S413).

Next, the communication unit 50 in the monitoring device 101_0 transfers the wireless packet to the monitoring device 101_2 (step S415).

Next, when the communication unit 50 in the monitoring device 101_2 receives the wireless packet from the monitoring device 101_0, the communication unit 50 transmits an ACK to the monitoring device 101_0 (step S417).

Next, the communication unit 50 in the monitoring device 101_2 discards the radio packet received from the monitoring device 101_0. Specifically, when the short address and sequence number included in the newly received radio packet overlap with the short address and sequence number included in the received radio packet, the monitoring device 101_2 newly receives the radio packet. Is destroyed (step S419).

FIG. 23 is a diagram showing an example of a reception history table held by each monitoring device in the communication system according to the embodiment of the present invention.

With reference to FIG. 23, the reception history table Tbh1 includes information on the reception history of the radio packet. The information in the reception history of the radio packet is, for example, the source short address, the sequence number, and the number of times the duplicate packet is received. The storage unit 108 in each monitoring device 101 stores the reception history table Tbh1.

The number of times the duplicated packet is received is the number of times that the monitoring device 101 receives the radio packet in which the source short address and the sequence number are duplicated.

FIG. 24 is a diagram showing a discard condition table held by each monitoring device in the communication system according to the embodiment of the present invention.

With reference to FIG. 24, the discard condition table Tbh2 includes an allowable reception number Rmax and an update time T2max. The storage unit 108 in each monitoring device 101 stores the discard condition table Tbh2.

FIG. 25 is a flowchart showing an example of an operation procedure when the monitoring device in the communication system according to the embodiment of the present invention receives a wireless packet. FIG. 25 shows the operation of the monitoring device 101_2 in FIG. 22.

With reference to FIG. 25, first, the communication unit 50 in the monitoring device 101_2 waits until it receives a wireless packet from another monitoring device 101_1 (NO in step S301).

Next, when the communication unit 50 receives the radio packet from the other monitoring device 101 (YES in step S301), whether or not the same radio packet is received before the received radio packet, that is, the received radio packet is It is confirmed whether or not it is the first wireless packet (step S303).

Next, when the received wireless packet is the first wireless packet (YES in step S303), the communication unit 50 starts measuring the elapsed time from receiving the wireless packet (step S305). ACK is transmitted to the monitoring device 101_1 (step S307).

On the other hand, if the received wireless packet is not the first wireless packet (NO in step S303), the communication unit 50 transmits ACK to another monitoring device 101 that is the transfer source. For example, when the communication unit 50 receives a wireless packet from the monitoring device 101_1, the communication unit 50 transmits an ACK to the monitoring device 101_1 (step S307).

Next, the communication unit 50 stores the source address and sequence number of the received radio packet in the storage unit 108. For example, the monitoring device 101_2 stores the source short address 0x0000 and the sequence number 001 of the received wireless packet in the reception history table Tbh1 in the storage unit 108 (step S309).

Next, the communication unit 50 determines whether or not the elapsed time since receiving the first wireless packet is the update time T2max or less (step S311).

When the elapsed time exceeds the update time T2max (NO in step S311), the communication unit 50 deletes the source short address and the sequence number corresponding to the received wireless packet from the reception history table Tbh1 (step S313).

On the other hand, when the elapsed time is equal to or less than the update time T2max (YES in step S311), the communication unit 50 allows the number of times of receiving duplicate packets, which are wireless packets in which the source short address and the sequence number are duplicated, to be the allowable number of receptions Rmax. It is confirmed whether or not it is the above (step S315).

When the number of times the duplicate packet is received is less than the allowable number of times Rmax (NO in step S315), the communication unit 50 waits until a new wireless packet is received (step S301).

On the other hand, when the number of times the duplicate packet is received is equal to or greater than the allowable number of times Rmax (YES in step S315), the communication unit 50 deletes the duplicate packet from the storage unit 108 (step S317).

In the communication system according to the embodiment of the present invention, in the monitoring device 101, the short address and the sequence number included in the newly received wireless packet are the short address and the sequence number included in the received wireless packet, respectively. In the case of duplication, the newly received radio packet is discarded, but the present invention is not limited to this. The monitoring device 101 receives the newly received radio packet even when the short address and sequence number included in the newly received radio packet overlap with the short address and sequence number included in the received radio packet. It may be configured not to be discarded.

Further, in the communication system according to the embodiment of the present invention, the monitoring device 101 is configured to include the sensor 111, but the present invention is not limited to this. The sensor 111 may be provided outside the monitoring device 101.

In this case, the sensor 111 transmits information indicating the measurement result to the monitoring device 101 by wire communication or wireless communication.

Further, in the communication system according to the embodiment of the present invention, a part of the monitoring devices 101 among the plurality of monitoring devices 101 may be provided with the sensor 111.

For example, a part of the monitoring devices 101 among the plurality of monitoring devices 101 may be provided with the sensor 111, and the other monitoring device 101 may not be provided with the sensor 111. In this case, the sensor 111 may be provided outside the monitoring device 101 that does not have the sensor 111, and the sensor 111 may transmit measurement information indicating the measurement result to the monitoring device 101.

Further, the monitoring device 101 without the sensor 111 may be configured to transfer information from another monitoring device 101 to another monitoring device 101 without serving as a source of information.

Further, even in a configuration in which either the transfer of the wireless packet in the upstream direction or the transfer of the wireless packet in the downstream direction is performed between the plurality of monitoring devices 101 in the communication system according to the embodiment of the present invention. good.

Further, in the communication system according to the embodiment of the present invention, each monitoring device 101 is configured to hold one or a plurality of short addresses separately in the up direction and the down direction, but the present invention is not limited to this. At least some monitoring devices 101 may be configured to hold one or more short addresses only in the up direction, or at least some monitoring devices 101 may hold one or more short addresses only in the down direction. It may be a structure to hold.

When the monitoring device 101 is configured to hold one or more short addresses only in the upward direction, the following configuration may be used. That is, for example, when the monitoring device 101 receives a packet from another monitoring device 101 on the downstream side, the monitoring device 101 stores the source short address included in the received packet in the storage unit 108. Then, when transmitting the packet in the downlink direction, the monitoring device 101 generates a packet in which the saved source short address is used as the transmission destination short address.

Further, when the monitoring device 101 is configured to hold one or a plurality of short addresses only in the downward direction, the following configuration may be used. That is, for example, when the monitoring device 101 receives a packet from another monitoring device 101 on the upstream side, the monitoring device 101 stores the source short address included in the received packet in the storage unit 108. Then, when transmitting the packet in the upstream direction, the monitoring device 101 generates a packet in which the saved source short address is used as the transmission destination short address.

By the way, a technique capable of realizing stable operation beyond the technique described in Patent Document 1 is desired.

On the other hand, the communication system 301 according to the embodiment of the present invention is a communication system used in a power system and including a plurality of monitoring devices 101. Different short addresses are fixedly assigned to the plurality of monitoring devices 101. The plurality of monitoring devices 101 can transfer information to another monitoring device 101 having a first short address registered in advance. The monitoring device 101 that fails to transfer the information to the other monitoring device 101 transfers the information to the other monitoring device 101 having the second short address registered in advance.

In this way, a different short address is fixedly assigned to each of the plurality of monitoring devices 101, and the monitoring device 101 transfers information to another monitoring device 101 having a short address registered in advance, which is a simple configuration. Information can be transmitted with.

Further, when the monitoring device 101 fails to transfer the information to the other monitoring device 101 having the first short address, the information is transferred to the other monitoring device 101 having the second short address, for example. Even if a situation occurs in which information cannot be transferred to the next-stage monitoring device 101, the information can be transmitted to the next-stage and subsequent monitoring devices 101 by skipping the next-stage monitoring device 101. As a result, it is possible to prevent the transfer of information from being delayed and to transmit information more reliably.

Therefore, in the communication system according to the embodiment of the present invention, more stable operation can be realized in the power system.

Further, in the communication system according to the embodiment of the present invention, the monitoring device 101 that fails to transfer information to another monitoring device 101 having a second short address has a third short address registered in advance. , Transfer information to another monitoring device 101.

With such a configuration, for example, even if a situation occurs in which information cannot be transferred even if the monitoring device 101 of the next stage is skipped, the monitoring device 101 is further skipped and the information is transmitted to other monitoring devices of the next stage or later. Can be transmitted. As a result, information can be transmitted more reliably.

Further, in the communication system according to the embodiment of the present invention, the monitoring device 101 generates a radio packet including its own short address and sequence number as a transmission source and transmits it to another monitoring device 101. When the short address and sequence number included in the newly received packet overlap with the short address and sequence number included in the received radio packet, the monitoring device 101 discards the newly received radio packet.

With such a configuration, for example, it is possible to prevent packets having the same contents from being transferred from a plurality of monitoring devices 101 by retransmission of wireless packets, and a large number of unnecessary wireless packets being transmitted between the monitoring devices 101.

Further, in the communication system according to the embodiment of the present invention, the monitoring device 101 transfers measurement information indicating the measurement result of the sensor 111 in the monitoring device 101, and transfers the measurement information received from the other monitoring device 101 to the sensor in the other monitoring device 101. At least one of the transfer of the measurement information indicating the measurement result of 111 is performed.

With such a configuration, it is possible to prevent the transfer of the measurement information indicating the measurement result of the sensor 111 from being delayed, and to transmit the measurement information more reliably. Therefore, it is possible to more reliably transmit information indicating the position of a lightning strike to the power transmission facility.

Further, in the communication system according to the embodiment of the present invention, the plurality of monitoring devices 101 include a monitoring parent device 102 that performs multi-hop communication and a plurality of monitoring child devices 103 that can communicate with the monitoring parent device 102. .. For each of the upward direction from each monitor device 103 to the monitor parent device 102 and the downward direction from the monitor parent device 102 to each monitor device 103, each monitor device 103 has a first short address and a second short address. It holds a short address separately. The first short address held by each monitor device 103 is exclusive in each of the up direction and the down direction. In each of the up direction and the down direction, the second short address held by each monitor device 103 is assigned to the monitor device 103 located after the next stage of the monitor device 103 to which the first short address is assigned. Has been done.

With such a configuration, the physically closest monitoring device 101 can be set as the first transfer destination in the up direction and the down direction along the arrangement direction of the plurality of monitoring devices 101, so that the wireless communication environment is deteriorated. It is possible to increase the certainty of information transmission in the case.

Further, the monitoring device 101 according to the embodiment of the present invention is a monitoring device in the communication system 301 which is used in the power system and includes a plurality of monitoring devices 101. Different terminal identifiers are fixedly assigned to the plurality of monitoring devices 101. The monitoring device 101 includes a storage unit 108 that stores a terminal identifier, and a communication unit 50 that transfers information to another monitoring device 101 having the first terminal identifier registered in advance. When the transfer of information to the other monitoring device 101 fails, the communication unit 50 transfers the information to the other monitoring device 101 having the second terminal identifier registered in advance.

In this way, a terminal identifier different from that of the other monitoring device 101 is fixedly assigned, and the communication unit 50 transfers information to the other monitoring device 101 having the terminal identifier registered in advance, which is a simple configuration. Information can be transmitted with. Further, when the communication unit 50 fails to transfer the information to the other monitoring device 101 having the first terminal identifier, the information is transferred to the other monitoring device 101 having the second terminal identifier, for example. Even if a situation occurs in which information cannot be transferred to the next-stage monitoring device 101, the information can be transmitted to the next-stage and subsequent monitoring devices 101 by skipping the next-stage monitoring device 101. As a result, it is possible to prevent the transfer of information from being delayed and to transmit information more reliably. Therefore, more stable operation can be realized in the power system.

Further, in the communication system according to the embodiment of the present invention, the plurality of monitoring devices 101 transmit information in series via a wireless transmission line.

Such a configuration simplifies the procedure of wireless communication, so that information can be transferred using a transmission path in which the number of hops is not limited or is significantly relaxed.

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 scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

The above description includes the features described below.
[Appendix 1]
A communication system used in the power system and equipped with multiple monitoring devices.
The plurality of monitors are installed in a plurality of steel towers, respectively, and transfer at least one of the measurement information indicating the measurement result of the sensor in the monitoring device or the measurement information received from the other monitoring device.
Different terminal identifiers are fixedly assigned to the plurality of monitoring devices.
The plurality of monitoring devices can transfer information to the other monitoring devices in the next and subsequent stages having the first terminal identifier registered in advance.
A communication system in which the monitoring device in which the transfer of information to the other monitoring device fails transfers information to the next other monitoring device in the next stage having the second terminal identifier registered in advance.

2 Steel tower 3 Overhead ground wire 4 Transmission line 101,101_0 to 101_4 Monitoring device 102 Monitoring parent device 103,103_1,103_2 Monitorer device 50,104,105 Communication unit 106 Battery 107 Control unit 108 Storage unit 111 Sensor 151 Collection device 181 Upper level Device 301 Communication system T, T1, T2 Monitoring system TL1, SL1 1st list information TL2, SL2 2nd list information

Claims (6)

A communication system used in the power system and equipped with multiple monitoring devices.
Different terminal identifiers are fixedly assigned to the plurality of monitoring devices.
The plurality of monitoring devices can transfer information to the other monitoring device having the first terminal identifier registered in advance.
A communication system in which the monitoring device in which the transfer of information to the other monitoring device fails transfers information to the other monitoring device having the second terminal identifier registered in advance. The monitoring device, which has failed to transfer the information to the other monitoring device having the second terminal identifier, transfers the information to the other monitoring device having the third terminal identifier registered in advance. Item 1. The communication system according to Item 1. The monitoring device generates a packet including the terminal identifier and the sequence number of the monitoring device as a transmission source and transmits the packet to the other monitoring device.
When the terminal identifier and the sequence number included in the newly received packet overlap with the terminal identifier and the sequence number included in the received packet, the monitoring device receives the newly received device. The communication system according to claim 1 or 2, wherein the packet is discarded. The monitoring device transfers at least one of measurement information indicating the measurement result of the sensor in the monitoring device and transfer of measurement information indicating the measurement result of the sensor in the other monitoring device received from the other monitoring device. The communication system according to any one of claims 1 to 3, which is performed. The plurality of monitoring devices include a monitoring parent device that performs multi-hop communication and a plurality of monitoring child devices that can communicate with the monitoring parent device.
For each of the ascending direction from the monitor child device to the monitoring parent device and the descending direction from the monitoring parent device to each monitor child device, each monitor child device has the first terminal identifier and the first terminal identifier. Holds 2 terminal identifiers separately
The first terminal identifier held by each monitor device is exclusive in each of the up direction and the down direction.
In each of the up direction and the down direction, the second terminal identifier held by each monitor device is the monitoring located in the next stage or later of the monitor device to which the first terminal identifier is assigned. The communication system according to any one of claims 1 to 4, which is assigned to a child device. The monitoring device used in a power system and in a communication system including a plurality of monitoring devices.
Different terminal identifiers are fixedly assigned to the plurality of monitoring devices.
A storage unit that stores the terminal identifier and
It is provided with a communication unit that transfers information to the other monitoring device having the first terminal identifier registered in advance.
When the transfer of information to the other monitoring device fails, the communication unit transfers the information to the other monitoring device having the second terminal identifier registered in advance.

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