WO2023012978A1 - Système de communication, dispositif d'intégration, dispositif relais, procédé de communication et programme de communication - Google Patents

Système de communication, dispositif d'intégration, dispositif relais, procédé de communication et programme de communication Download PDF

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Publication number
WO2023012978A1
WO2023012978A1 PCT/JP2021/029157 JP2021029157W WO2023012978A1 WO 2023012978 A1 WO2023012978 A1 WO 2023012978A1 JP 2021029157 W JP2021029157 W JP 2021029157W WO 2023012978 A1 WO2023012978 A1 WO 2023012978A1
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WIPO (PCT)
Prior art keywords
aggregation
devices
terminal
aggregating
entry list
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PCT/JP2021/029157
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English (en)
Japanese (ja)
Inventor
優馬 佐藤
範行 小林
和幸 岡部
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2022523720A priority Critical patent/JP7214049B1/ja
Priority to PCT/JP2021/029157 priority patent/WO2023012978A1/fr
Priority to TW111128535A priority patent/TWI818650B/zh
Publication of WO2023012978A1 publication Critical patent/WO2023012978A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H04W40/32—Connectivity information management, e.g. connectivity discovery or connectivity update for defining a routing cluster membership
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H04W84/22—Self-organising networks, e.g. ad-hoc networks or sensor networks with access to wired networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present disclosure relates to a communication system, aggregating device, relay device, communication method, and communication program that perform multi-hop communication.
  • smart meters In recent years, interest in an energy-saving society has increased, and the introduction of an automatic meter reading device called a smart meter that enables visualization of power consumption through automatic meter reading and control of power supply and demand is being promoted. In the future, smart meters will be installed in all households, and will be constructed and operated as a wide-area, large-scale network within the jurisdiction of each electric power company.
  • a large number of smart meters constitute a multi-hop network, and each smart meter transmits metering data to the concentrator, which is the root of the multi-hop network.
  • a smart meter network which is a multi-hop network that includes a large number of smart meters, is equipped with multiple aggregating devices, and the measurement data aggregated by each aggregating device is sent to an upper server called a head end system (HES). collects.
  • HES head end system
  • Patent Document 1 discloses a technique in which an aggregation device aggregates measurement results received from smart meters and transmits them to a central processing unit, which is a host server.
  • the central processing unit instructs the corresponding smart meter to re-collect the measurement result via the aggregation device. getting results.
  • the central processing unit needs to receive the data periodically collected from each aggregation device each time, and re-collection of the smart meters for which the measurement results could not be collected in the periodic collection. It will manage various instructions to the smart meter, including request management.
  • the present disclosure has been made in view of the above, and aims to obtain a communication system capable of reducing the load on the host server.
  • the communication system includes a plurality of aggregation devices and a plurality of terminals that transmit uplink data to any one of the plurality of aggregation devices.
  • a communication system comprising a wireless multi-hop network and an upper server that collects uplink data from a plurality of aggregation devices, the communication system comprising a relay device that relays communication between the plurality of aggregation devices, each of the plurality of aggregation devices receives first information from another aggregating device of a plurality of aggregating devices via a relay device, generates second information using the first information, and transmits the second information to a device in the communication system. .
  • the communication system according to the present disclosure has the effect of reducing the load on the upper server.
  • FIG. 1 is a diagram showing a configuration example of a communication system according to a first embodiment
  • FIG. FIG. 1 shows a configuration example of an upper server according to the first embodiment
  • FIG. 1 shows a configuration example of an aggregation device according to Embodiment 1
  • FIG. 10 is a diagram showing an example of a control circuit according to Embodiment 1
  • FIG. 11 is a diagram showing the correspondence between each aggregation device in the first state and the terminal in the communication system of Embodiment 1;
  • FIG. 11 is a diagram showing the correspondence between each aggregation device in the second state and the terminal in the communication system of the first embodiment; Flowchart showing an example of an entry list update processing procedure in the aggregation device according to the first embodiment Chart diagram showing an example of a re-collection procedure in the communication system of Embodiment 1
  • FIG. 4 is a chart diagram showing an example of a procedure for transmitting an instruction to a terminal in the communication system according to the first embodiment;
  • FIG. 3 is a flow chart showing an example of a processing procedure when an instruction addressed to a terminal is received from a host server in the aggregation device of Embodiment 1.
  • a diagram showing a configuration example of a communication system according to a second embodiment A diagram showing a configuration example of a relay device according to a second embodiment Chart diagram showing an example of a re-collection procedure in the communication system of the second embodiment
  • FIG. 1 is a diagram illustrating a configuration example of a communication system according to a first embodiment
  • the communication system of the present embodiment is used, for example, for automatic meter reading of electric energy, but may be used for other purposes as well as automatic meter reading of electric energy. Further, the communication system of the embodiment may be used for automatic meter reading other than electric energy, such as automatic gas meter reading.
  • the communication system of the present embodiment includes a host server 1 as a communication management device, aggregation devices 2-1 and 2-2, and terminals 3-1 to 3-12. Specifically, the communication system of the present embodiment transmits upstream data to any one of the aggregation devices 2-1 and 2-2, which are examples of a plurality of aggregation devices, and the aggregation devices 2-1 and 2-2. a wireless multi-hop network composed of terminals 3-1 to 3-12, and a host server 1 that collects upstream data from the aggregation devices 2-1 and 2-2.
  • two aggregation devices and twelve terminals are shown in FIG. 1, the number of aggregation devices and terminals is not limited to the example shown in FIG.
  • the aggregation devices 2-1 and 2-2 communicate with each other to allow the aggregation devices 2-1 and 2-2 to perform part of the processing performed by the upper server 1. It becomes possible. As a result, the load on the host server 1 can be reduced in this embodiment.
  • Terminals 3-1 to 3-12 are communication devices connected to meters for measuring electric energy, which will be described later.
  • Each of terminals 3-1 to 3-12 and the corresponding meter constitute a so-called smart meter. be. That is, the terminals 3-1 to 3-12 are part of a smart meter, and transmit meter data, which is power consumption measurement data, to the corresponding aggregation devices 2-1 and 2-2.
  • Terminals 3-1 to 3-12 are installed, for example, in electric power consumers.
  • the terminals 3-1 to 3-12 communicate with devices other than meters depending on the purpose. and transmits data acquired from other devices to the corresponding aggregation devices 2-1 and 2-2.
  • terminals 3-1 to 3-12 periodically transmit meter data.
  • the periodic transmission cycle of meter data is hereinafter referred to as a regular transmission cycle.
  • the periodic transmission cycle is, for example, one of 30 minutes, 15 minutes and 5 minutes, but the periodic transmission cycle is not limited to these.
  • periodical collection of meter data will also be referred to as periodical collection.
  • Aggregating devices 2-1, 2-2 and terminals 3-1 to 3-12 form a wireless multi-hop network with the aggregating devices 2-1, 2-2 as the root.
  • the aggregating devices 2-1, 2-2 and terminals 3-1 to 3-12 constituting the wireless multi-hop network are hereinafter also referred to as nodes.
  • the lines connecting the aggregation devices 2-1, 2-2 and the terminals 3-1 to 3-12 in FIG. 1 indicate wireless links.
  • An example in which the communication system of the present embodiment is a wireless multi-hop network will be described below, but it may be a multi-hop network using power line communication or the like.
  • the aggregation devices 2-1 and 2-2 collect meter data from the terminals 3-1 to 3-12, aggregate the collected meter data, and transmit it to the host server 1 via the network.
  • the host server 1 can periodically collect meter data, which is the measurement result of electric energy, from the terminals 3-1 to 3-12, which are examples of a plurality of terminals, as upstream data.
  • the network between the aggregation devices 2-1, 2-2 and the upper server 1 is an IP (Internet Protocol) network, such as an optical line network or a mobile phone network, but not limited to these.
  • IP Internet Protocol
  • the aggregation devices 2-1 and 2-2 are installed, for example, on a utility pole, but the installation position is not limited to the utility pole.
  • the aggregating devices 2-1 and 2-2 receive data for other purposes received from the terminals 3-1 to 3-12. to the host server 1 via the network.
  • the aggregation devices 2-1 and 2-2 are indicated without distinguishing them individually, they are referred to as aggregation device 2.
  • FIG. The aggregation devices 2 are connected by an arbitrary line such as a dedicated line or a public line, and a relay device (not shown) may be provided between the aggregation devices 2 .
  • routing is performed based on a defined routing protocol.
  • RPL IPv6 Routing Protocol for Low-Power and Lossy Networks
  • the routing protocol is not limited to this, an example in which RPL is used as the routing protocol will be described below in this embodiment.
  • RPL with respect to an upstream path, which is a communication path from each terminal 3 to the aggregation device 2, each terminal 3 manages the next terminal 3 on the path toward the aggregation device 2 as an upstream path.
  • lines connecting the terminals 3 and connecting the aggregation device 2 and the terminals 3 indicate that wireless communication can be performed with each other.
  • each terminal 3 may be capable of wireless communication with a plurality of terminals 3 .
  • Each terminal 3 exchanges control messages for route construction with other terminals 3 or the aggregation device 2 to Choose an uphill route. For example, each terminal 3 selects an uplink route according to the number of hops to the aggregation device 2, communication quality, and the like. Also, each terminal 3 sequentially adds its own identification information to the uplink control message. As a result, the aggregation device 2 can grasp the terminal 3 that has passed through as an uplink route corresponding to each terminal 3 . In RPL, with regard to the downlink route from the aggregation device 2 to each terminal 3, the aggregation device 2 determines the reverse route of the uplink route as the downlink route.
  • the communication network can be any network, for example an IP network.
  • the host server 1 collects meter data from the aggregation devices 2-1 and 2-2, and transmits the collected meter data to a meter data management system (MDMS) (not shown).
  • MDMS is a device for managing meter data.
  • the host server 1 may use Send the data to a management device or the like for other uses.
  • the host server 1 also transmits control signals for controlling the terminals 3-1 to 3-12 to the terminals 3-1 to 3-12 via the aggregation devices 2-1 and 2-2.
  • the host server 1 receives a control signal for controlling the switch from the host server 1, and transmits the control signal to the switch. It is sent to the terminals 3-1 to 3-12 corresponding to the device.
  • FIG. 2 is a diagram showing a configuration example of the host server 1 of this embodiment.
  • the host server 1 includes a transmission/reception section 11 , a control processing section 12 and a storage section 13 .
  • the transmission/reception unit 11 communicates with the aggregation device 2 .
  • the transmission/reception unit 11 passes the data received from the aggregation device 2 to the control processing unit 12 .
  • the transmitting/receiving unit 11 transmits the downlink control signal generated by the control processing unit 12 to the corresponding aggregation device 2 via the transmitting/receiving unit 11 .
  • the downlink control signal is a signal for controlling the terminal 3 or the aggregation device 2, such as requesting recollection of meter data.
  • the control processing section 12 When the data received from the aggregation device 2 via the transmission/reception section 11 is meter data, the control processing section 12 stores the received meter data in the storage section 13 . Also, when the data received from the aggregation device 2 via the transmission/reception unit 11 is an entry list, the control processing unit 12 stores the entry list in the storage unit 13 .
  • the entry list is information indicating the terminals 3 under the control of each aggregation device 2 .
  • the control processing unit 12 also generates a downlink control signal indicating an instruction to control the aggregation device 2 or the terminal 3 and transmits the generated downlink control signal to the destination via the transmission/reception unit 11 .
  • the control processing unit 12 refers to the entry list stored in the storage unit 13 and refers to the relevant terminal 3. Identify the aggregation device 2 corresponding to the terminal 3, generate a recollection request instructing recollection of meter data from the terminal 3, and transmit the recollection request to the identified aggregation device 2 via the transmission/reception unit 11. do. That is, the recollection request is an instruction to recollect meter data for the terminal 3 that has failed to acquire meter data.
  • the control processing unit 12 when the data received from the aggregation device 2 via the transmission/reception unit 11 is response data corresponding to an instruction transmitted from the upper server 1, the control processing unit 12 performs processing based on the response data. . Further, the control processing unit 12 transmits the meter data stored in the storage unit 13 to the MDMS (not shown) via the transmitting/receiving unit 11 at a predetermined timing or a timing specified by the MDMS (not shown).
  • the storage unit 13 stores meter data and entry lists. Further, when the host server 1 collects information other than meter data from the terminal 3, the storage unit 13 may also store the information.
  • FIG. 3 is a diagram showing a configuration example of the aggregation device 2 of this embodiment.
  • the aggregation device 2 includes a first transmission/reception section 21 , a communication control section 22 , a control processing section 23 , a second transmission/reception section 24 and a storage section 25 .
  • the first transmission/reception unit 21 performs wireless communication with the terminal 3. Upon receiving data from the terminal 3 , the first transmission/reception section 21 outputs the data to the communication control section 22 . The first transmission/reception unit 21 also transmits control signals such as instructions to the terminal 3 received from the communication control unit 22 to the terminal 3 .
  • the second transmission/reception unit 24 communicates with the upper server 1 and other aggregation devices 2 . Upon receiving a control signal from the host server 1 , the second transmission/reception section 24 outputs the control signal to the control processing section 23 . The second transmission/reception unit 24 also transmits data addressed to the host server 1 input from the control processing unit 23 to the host server 1 .
  • the communication control unit 22 performs communication control according to the routing protocol in the wireless multi-hop network.
  • the routing protocol is assumed here to be RPL.
  • the communication control unit 22 receives data transmitted from the terminal 3 from the first transmission/reception unit 21, if the data is an uplink control message used for path construction, the data stored in the data is A downstream route is obtained using the upstream route, and the obtained downstream route is stored in the storage unit 25 as route information.
  • the communication control unit 22 receives the data transmitted from the terminal 3, if the terminal 3 that is the transmission source of the data is not included in the first participation list of the storage unit 25, the communication control unit 22 to the first entry list.
  • the first entry list is an entry list in which each terminal 3 indicates the terminal 3 under the terminal 3 itself, that is, the terminal 3 under the terminal 3 that indicates the terminal 3 that transmits the meter data to the upper server 1 via the terminal 3 itself.
  • the communication control unit 22 stores the meter data in the storage unit 25 . Further, when updating the first entry list stored in the storage unit 25, the communication control unit 22 notifies the control processing unit 23 that the first entry list has been updated. Thereby, the control processing unit 23 instructs the second transmission/reception unit 24 to transmit the first entry list, and the second transmission/reception unit 24 transmits the first entry list to the other aggregation device 2 .
  • the transmission destination of the first entry list is, for example, the aggregation device 2 adjacent to the aggregation device 2, but is not limited to this and may include an aggregation device other than the adjacent aggregation device 2.
  • the identification information of the aggregation device 2 to which the first entry list is to be sent is designated by the host server 1, for example.
  • the number of destination aggregation devices 2 of the first entry list may be one or more. In FIG. 1, two aggregation devices 2 are shown for the sake of simplification of the drawing, but in general, more than two aggregation devices 2 are often provided. set as the destination. For example, although part of the illustration is omitted in FIG. , 2-5, the aggregation device 2-2 transmits the first entry list to the aggregation devices 2-1 and 2-3, which are adjacent aggregation devices. Further, the aggregation device 2-2 may transmit the first entry list to the aggregation device 2-4, which is one ahead.
  • the communication control unit 22 when the communication control unit 22 receives a control signal addressed to the terminal 3 transmitted from the host server 1 from the control processing unit 23, the communication control unit 22 transmits the control signal to the terminal 3 using the route information stored in the storage unit 25. do. Specifically, the communication control unit 22 refers to the route information and adds information indicating the terminal 3 that is routed in the down route to the destination terminal 3, that is, the communication route to the destination terminal 3, to the control signal. Then, the control signal to which the downstream path is added is transmitted to the destination terminal 3 via the first transmitting/receiving section 21 .
  • the control processing unit 23 When the control signal received from the second transmission/reception unit 24 is addressed to itself, the control processing unit 23 performs processing according to the control signal. For example, if the control signal is a recollection request that instructs recollection of meter data that was not collected in the regular collection, the terminal 3 specified by the recollection request is sent via the communication control unit 22 and the first transmission/reception unit 21. command to recollect meter data. The control processing unit 23 passes the control signal to the communication control unit 22 when the control signal received from the second transmission/reception unit 24 is addressed to the terminal 3 .
  • control processing unit 23 aggregates the meter data received from each terminal 3 under its control stored in the storage unit 25, and transmits the aggregated meter data to the host server 1 via the second transmission/reception unit 24. .
  • control processing unit 23 transmits the first entry list to the upper server 1 at a period longer than the periodical transmission period, such as once a day, or when instructed by the upper server 1. .
  • the host server 1 stores this first entry list in the storage unit 13 as the entry list of each aggregation device 2 .
  • the control processing unit 23 transmits the first entry list to the second transmission/reception unit 24 to the other aggregation devices 2. to do so. Further, when the data received from the second transmission/reception unit 24 is the first entry list in the other aggregation device 2 transmitted from the other aggregation device 2, the control processing unit 23 converts the received first entry list into , is stored in the storage unit 25 as a second entry list that is an entry list of the other aggregation device 2 . At this time, the control processing unit 23 stores the second entry list in the storage unit 25 in association with the identification information of the aggregation device 2 in the first entry list.
  • the second entry list is, for example, the entry list in the adjacent aggregation device 2 as described above.
  • one second entry list is shown in the storage unit 25 in FIG. 2, there may be a plurality of second entry lists.
  • the storage unit 25 stores two second entry lists.
  • the second entry list is the entry list of the adjacent aggregation device 2 will be described below.
  • these first entry lists are also stored in the storage unit 25 as second entry lists.
  • the aggregation device 2 holds not only the first entry list indicating the terminals 3 under its control, but also the entry lists of the adjacent aggregation devices 2 as the second entry list.
  • the storage unit 25 stores meter data, route information, first entry list and second entry list. Further, when the host server 1 collects information other than meter data from the terminal 3, the storage unit 25 may also store the information.
  • FIG. 4 is a diagram showing a configuration example of the terminal 3 of this embodiment.
  • the terminal 3 includes a first transmission/reception section 31 , a communication control section 32 , a control processing section 33 , a storage section 34 and a second transmission/reception section 35 .
  • the first transmission/reception unit 31 performs wireless communication with the aggregation device 2 or the terminal 3, which are other nodes in the wireless multi-hop network. When receiving data from another node, the first transmission/reception unit 31 outputs the data to the communication control unit 32 . Also, the first transmission/reception unit 31 transmits data received from the communication control unit 32 to other nodes based on instructions from the communication control unit 32 .
  • the communication control unit 32 performs communication control according to the routing protocol in the wireless multi-hop network. For example, when the terminal 3 newly joins the wireless multi-hop network, the communication control unit 32 exchanges control messages via the first transmission/reception unit 31 to hold uplink route information for the aggregation device 2. The number of hops from the current node to the aggregating device 2 and the identification information of the aggregating device 2 are acquired, and based on the acquired number of hops, the strength of the signal received from the node, etc., the next node to be used for forwarding the upstream data to decide.
  • the communication control unit 32 stores the identification information of the aggregation device 2, the identification information of the determined next node, and the number of hops obtained by adding 1 to the number of hops acquired from the node in the storage unit 34 as route information. Further, when the communication control unit 32 receives a message requesting acquisition of route information from another node via the first transmission/reception unit 31, the communication control unit 32 sends the message to the node of the transmission source of the message via the first transmission/reception unit 31. 34 to send a message containing the number of hops stored as route information. In addition, the communication control unit 32 monitors the state of communication with the next node stored in the route information. Then, by exchanging control messages, it selects another node and updates the route information with the selected node's identity and hop count.
  • the communication control unit 32 outputs the received data to the control processing unit 33 when the data received from the first transmission/reception unit 31 is addressed to its own terminal.
  • the communication control unit 32 forwards the data to the next node in the downlink direction based on the downlink route stored in the data. By sending the data, the data is transferred to the destination node.
  • the communication control unit 32 uses the route information stored in the storage unit 34 to transmit the data to the first 1 transmission/reception unit 31 to the next node in the upstream direction.
  • the upstream data arrives at the destination aggregation device 2 as each node sequentially transfers the data using the route information.
  • the second transmission/reception unit 35 receives meter data from the meter 4 that measures the amount of power, and stores the received meter data in the storage unit 34.
  • control processing unit 33 When the control processing unit 33 receives data from the communication control unit 32, it performs a predetermined process based on the received data. In addition, the control processing unit 33 reads the meter data stored in the storage unit 34 and outputs the read meter data to the communication control unit 32 at regular transmission intervals. When the control processing unit 33 receives a recollection request addressed to itself from the communication control unit 32 , the control processing unit 33 reads the meter data stored in the storage unit 34 and outputs the read meter data to the communication control unit 32 .
  • the transmission/reception unit 11 of the host server 1 of this embodiment is realized by a transmitter and a receiver, and the control processing unit 12 is realized by a control circuit.
  • the storage unit 13 is implemented by a memory.
  • FIG. 5 is a diagram showing an example of the control circuit of this embodiment.
  • the control circuit 100 shown in FIG. 5 includes a processor 101 such as a CPU (Central Processing Unit) or MPU (Micro Processor Unit), and a memory 102 .
  • the memory 102 includes semiconductor memories such as RAM (Random Access Memory) and ROM (Read Only Memory), magnetic disks, and the like.
  • the control processing unit 12 of the host server 1 is realized by the processor 101 executing a communication program for realizing the operation of the host server 1 stored in the memory 102 .
  • a communication program may be provided by a recording medium or may be provided by a communication medium.
  • the memory that implements the storage unit 13 may be a part of the memory 102, or may be a memory separate from the control circuit.
  • the host server 1 is generally realized by a computer system, and may include a display unit such as a monitor and a display, and an input unit such as a keyboard and a mouse, although not shown. .
  • the first transmitting/receiving section 21 and the second transmitting/receiving section 24 of the aggregation device 2 of the present embodiment are realized by a transmitter and a receiver.
  • the communication control unit 22 and the control processing unit 23 are implemented by processing circuits, and the storage unit 25 is implemented by a memory.
  • the processing circuit may be the control circuit 100 as shown in FIG. 5, or may be a dedicated circuit such as FPGA (Field-Programmable Gate Array) or ASIC (Application Specific Integrated Circuit).
  • the processor 101 executes a communication program stored in the memory 102 for realizing the operation of the aggregation device 2, whereby communication control is performed.
  • a unit 22 and a control processing unit 23 are implemented.
  • a communication program may be provided by a recording medium or may be provided by a communication medium.
  • the memory that implements the storage unit 25 may be a part of the memory 102 or may be a memory separate from the control circuit 100 .
  • the first transmitting/receiving section 31 and the second transmitting/receiving section 35 of the terminal 3 of the present embodiment are realized by a transmitter and a receiver.
  • the communication control unit 32 and the control processing unit 33 are implemented by processing circuits, and the storage unit 34 is implemented by a memory.
  • the processing circuit may be the control circuit 100 as shown in FIG. 5, or may be a dedicated circuit such as FPGA or ASIC.
  • the communication control unit 32 and the control processing unit 33 are realized by the control circuit 100, the communication control unit 32 and a control processing unit 33 are implemented.
  • a communication program may be provided by a recording medium or may be provided by a communication medium.
  • the memory that implements the storage unit 34 may be a part of the memory 102 or may be a memory separate from the control circuit 100 .
  • the host server 1 periodically collects meter data from each terminal 3 via the aggregation device 2 .
  • the host server 1 determines whether or not the meter data transmitted from all the terminals 3 to be collected has been successfully received.
  • the meter data is collected again from the terminal 3.
  • the control processing unit 12 of the host server 1 confirms the meter data in the storage unit 13 for each periodic transmission cycle, and if there is a terminal 3 whose meter data is not stored in the storage unit 13, the storage unit 13 is searched for the aggregating device 2 corresponding to the terminal 3, and a recollection request is transmitted to the found aggregating device 2 via the transmission/reception unit 11.
  • the recollection request includes the identification information of the terminal 3 to be recollected.
  • each terminal 3 may change the uplink route depending on the communication state, etc., as described above.
  • the terminal 3 may be subordinate to an aggregating device 2 different from the aggregating device 2 that has been the destination of the uplink data until then.
  • FIG. 6 is a diagram showing the correspondence between each aggregation device 2 in the first state and the terminal 3 in the communication system of the present embodiment.
  • the example shown in FIG. 6 shows the correspondence between each aggregation device 2 and the terminal 3 in the first state, which is the state at a certain time in the communication system shown in FIG.
  • a group 6-1 shows the terminals 3 under the control of the aggregation device 2-1 in the first state
  • a group 6-2 shows the terminals 3 under the control of the aggregation device 2-2 in the first state.
  • meters transmitted from terminals 3-1, 3-2, 3-4, 3-5, 3-8, 3-9, 3-10, and 3-11 belonging to group 6-1 The data arrives at the host server 1 via the aggregation device 2-1, and the meter data transmitted from the terminals 3-3, 3-6, 3-7, and 3-12 belonging to the group 6-2 are aggregated It reaches the host server 1 via the device 2-2.
  • meter data transmitted from the terminal 3-11 reaches the centralizing device 2-1 via the terminals 3-5 and 3-2.
  • FIG. 7 is a diagram showing the correspondence between each aggregation device 2 in the second state and the terminal 3 in the communication system of the present embodiment.
  • the example shown in FIG. 6 shows the correspondence between each aggregation device 2 in the second state and the terminal 3 in the communication system shown in FIG.
  • the terminal 3-11 fails to communicate with the terminal 3-5 and, according to the routing protocol, transfers the terminal 3-6 to the next node on the upstream route.
  • This is the state after selecting as .
  • the terminal 3-11 selects the next node on the uplink route by receiving a control message including route information in the other terminal 3 periodically transmitted from the other terminal 3.
  • the route information of the other terminal 3 may be acquired from the other terminal 3 by broadcasting a control message requesting acquisition of route information.
  • the terminal 3-11 is also subordinate to the aggregation device 2-2.
  • the aggregation device 2 that relays the communication of the terminal 3 may be changed.
  • the host server 1 determines that the meter data of the terminal 3-11 is missing in the second state. Since it takes time to update the entry list held in the storage unit 13 of the upper server 1, at this time, the entry list held in the storage unit 13 of the upper server 1 does not include the terminal 3- 11 route changes may not be reflected. In this case, the host server 1 refers to the entry list held in the storage unit 13 and transmits a recollection request instructing recollection from the terminal 3-11 to the aggregation device 2-1. Become. When the aggregating device 2-1 receives the recollection request, it transmits the recollection request with the terminal 3-11 as the destination. Therefore, communication with the aggregation device 2-1 cannot be performed.
  • the aggregating device 2-1 cannot obtain a response from the terminal 3-11.
  • the meter data of the terminal 3-11 is not sent to the server 1.
  • the host server 1 judges that the re-collection of the meter data of the terminal 3-11 has failed, searches for which aggregation device 2 the terminal 3-11 is subordinate to, and obtains the aggregation device 2 obtained by the search. will send a recollection request to This processing is performed, for example, in the following procedure.
  • the host server 1 instructs each aggregation device 2 to review the terminal 3 under its control in order to confirm which aggregation device 2 it is under.
  • each aggregation device 2 When each aggregation device 2 is instructed to review the subordinate terminal 3, it transmits a control message to the subordinate terminal 3 to confirm which aggregation device 2 it is subordinate to, and the terminal 3 under the aggregation device 2 responds. , the terminal 3 under the control of the aggregation device 2 is grasped. As a result, the aggregation device 2 updates its own entry list and transmits the updated entry list to the host server 1 . By referring to the updated entry list, the host server 1 grasps that the terminal 3-11 is under the control of the aggregation device 2-2, and requests the aggregation device 2-2 to re-collect from the terminal 3-11. Send a recollection request that tells you what to do. As described above, in the comparative example, the host server 1 is burdened with searching for the aggregation device 2 and sending a re-collection request again.
  • each aggregation device 2 holds a first entry list indicating the terminals 3 under its control, and holds the first entry list of the adjacent aggregation device 2 as a second entry list. This reduces the processing load on the host server 1 in re-collection.
  • FIG. 8 is a flowchart showing an example of an entry list update processing procedure in the aggregation device 2 of the present embodiment.
  • the aggregation device 2 determines whether or not the terminal 3 under its control has been updated (step S1). Specifically, when the communication control unit 22 of the aggregation device 2 receives a control message requesting entry into the wireless multi-hop network from the terminal 3 via the first transmission/reception unit 21, the terminal 3 under its control is updated. judge there is.
  • the aggregation device 2 when a terminal 3 that was under the control of another aggregation device 2 searches for an upstream route again due to a communication error or the like and becomes under the control of itself, the aggregation device 2 similarly transmits a control message from the terminal 3. Thus, it is determined that the subordinate terminal 3 has been updated.
  • the aggregation device 2 updates the first entry list (step S2). Specifically, the communication control unit 22 of the aggregation device 2 updates the first entry list stored in the storage unit 25 based on the control message received from the terminal 3 via the first transmission/reception unit 21, for example.
  • the aggregation device 2 transmits the updated first entry list to the other aggregation devices 2 (step S3), and repeats the processing from step S1.
  • step S3 more specifically, the communication control unit 22 of the aggregation device 2 notifies the control processing unit 23 of the update of the first entry list, and the control processing unit 23 sends the first entry list to the adjacent aggregation device 2. It transmits via the second transmitting/receiving section 24 .
  • the aggregation device 2 holds the identification information of the adjacent aggregation device 2 by being notified from the host server 1 or preset.
  • step S1 No If the subordinate terminal 3 has not been updated (step S1 No), the aggregation device 2 repeats step S1.
  • the aggregation device 2 transmits it to the adjacent aggregation device 2 .
  • the aggregation device 2 stores the received first entry list in the storage unit 25 as the second entry list.
  • each aggregation device 2 holds the first entry list of the adjacent aggregation device 2 as the second entry list, so that the terminals 3 under the control of the adjacent aggregation device 2 can be grasped.
  • the aggregation device 2 when receiving a recollection request from the host server 1, the aggregation device 2 performs recollection if the terminal 3 instructed to recollection by the recollection request is included in the second entry list.
  • a recollection request is transmitted to the aggregation device 2 that has the designated terminal 3 under its control.
  • the aggregating device 2 that has the terminal 3 instructed to recollect under its control can recollect from the terminal 3 .
  • the host server 1 needs to search for the aggregation device 2 that has the terminal 3 under its control and transmit a recollection request to the aggregation device 2 obtained by the search. By coordinating between the aggregation devices 2, the load on the upper server 1 can be reduced.
  • FIG. 9 is a chart showing an example of a recollection procedure in the communication system of this embodiment.
  • FIG. 9 shows an example of a re-collection procedure when there is missing data in the terminals 3-4, 3-8, and 3-11 in the regular collection.
  • the host server 1 holds the entry list corresponding to the state shown in FIG. Assume that it is under the control of 2-2.
  • the terminal 3-8 holds the identification information of the terminal 3-4 as route information
  • the terminal 3-4 holds the identification information of the terminal 3-1 as route information.
  • the meter data transmitted from the terminal 3-8 reaches the aggregation device 2-1 via the terminals 3-4 and 3-1.
  • the host server 1 sends a recollection request to the aggregation device 2-1 to instruct recollection from the terminals 3-4, 3-8, and 3-11 that could not collect the meter data.
  • the aggregation device 2-1 refers to the first entry list and the second entry list (step S12). Specifically, when the control processing unit 23 of the aggregation device 2-1 receives the recollection instruction via the second transmission/reception unit 24, it refers to the first entry list and the second entry list stored in the storage unit 25. do.
  • the aggregating device 2-1 issues a recollection request to the terminals 3-4, 3-8 included in the first participation list among the terminals 3-4, 3-8, 3-11 instructed to recollection by the recollection request. is transmitted (steps S13 and S14). Specifically, the terminals 3-4, 3-8 among the terminals 3-4, 3-8, and 3-11 for which recollection is instructed by the recollection request are included in the first participation list by the control processing unit 23. and instructs the communication control unit 22 to transmit a recollection request to the terminals 3-4 and 3-8.
  • the communication control unit 22 refers to the route information and transmits to the terminal 3-1 a recollection request addressed to the terminals 3-4 and 3-8.
  • the communication control unit 22 adds the terminal 3 to the recollection request through the downlink route, and although the illustration of the terminal 3-1 is omitted in FIG. A recollection request addressed to the terminal 3-8 arrives at the terminal 3-8 via the terminals 3-1 and 3-4.
  • the terminals 3-4 and 3-8 Upon receiving the recollection request, the terminals 3-4 and 3-8 transmit the meter data to the aggregation device 2-1 (steps S15 and S16).
  • the aggregation device 2-1 aggregates the meter data received from the terminals 3-4 and 3-8 (step S17), and transmits it to the host server 1 (step S18).
  • the aggregation device 2-1 transmits a re-collection request to the aggregation device 2-2 (step S19). Specifically, among the terminals 3-4, 3-8, and 3-11 for which re-collection is instructed by the re-collection request, the control processing unit 23 of the aggregating device 2-1 sends the terminal 3-11 to the aggregating device 2-1. 2, and instructs the communication control unit 22 to transmit a recollection request instructing recollection of the terminal 3-11 to the aggregation device 2-2. The communication control unit 22 transmits a recollection request addressed to the terminal 3-11 to the aggregation device 2-2 via the first transmission/reception unit 21. FIG.
  • the aggregation device 2-2 Upon receiving the recollection request from the aggregation device 2-1, the aggregation device 2-2 transmits the recollection request to the terminal 3-11 (step S20). Specifically, when the control processing unit 23 of the aggregation device 2-2 receives the recollection request via the second transmitting/receiving unit 24, it refers to the first entry list in the storage unit 25 and instructs the recollection request. It determines that the terminal 3-11 that was found is included in the first entry list, and instructs the communication control unit 22 to transmit a recollection request to the terminal 3-11. The communication control unit 22 refers to the route information and transmits a recollection request addressed to the terminal 3-11 to the terminal 3-3.
  • a route passing through the terminals 3-3 and 3-6 is stored as the downstream route of the terminal 3-11 in the route information of the aggregation device 2-2.
  • the terminals 3-3 and 3-6 are not shown in FIG. 9, the recollection request addressed to the terminal 3-11 arrives at the terminal 3-11 via the terminals 3-3 and 3-6.
  • the terminal 3-11 Upon receiving the recollection request, the terminal 3-11 transmits the meter data to the aggregation device 2-2 (step S21).
  • the aggregation device 2-2 aggregates the meter data received from the terminal 3-11 (step S22), and transmits it to the host server 1 (step S23).
  • the host server 1 since the meter data re-collected by the aggregation device 2-2 is only for the terminal 3-11, the aggregated meter data and the re-collected meter data are the same. If there is meter data recollected from the terminal 3, the meter data recollected from the other terminals 3 and the meter data recollected from the terminal 3-11 are aggregated and transmitted to the host server 1. ⁇
  • the aggregating device 2-1 when the aggregating device 2-1 receives a recollection request from the terminal 3-11 that has changed from being under the aggregating device 2-1 to being under the aggregating device 2-2, Even if there is, the aggregation device 2-1 transmits a recollection request for the terminal 3-11 to the aggregation device 2-2. Therefore, after the host server 1 transmits the re-collection request in step S11 shown in FIG. , the host server 1 does not need to search for the aggregation device 2 that has the terminal 3-11 under its control, or transmit a re-collection request to the aggregation device 2 obtained by the search. Therefore, the load on the host server 1 is reduced.
  • the load on the upper server 1 was reduced in response to a recollection request. 2, if the aggregation device 2 to which the terminal 3 belongs is changed, the control signal does not reach the terminal 3 and the response from the terminal 3 cannot be obtained. Therefore, in the comparative example, the host server 1 searches for the aggregation device 2 that has the destination terminal 3 under its control, and transmits a control signal to the aggregation device 2 obtained by the search, in the same manner as the recollection request. need to be done.
  • the aggregation device 2 even when the aggregation device 2 receives an instruction addressed to the terminal 3 from the upper server 1, if the destination terminal 3 is not included in the first entry list, the second entry list is By referring to it, the control signal is transferred to the aggregation device 2 corresponding to the destination terminal 3 .
  • the instruction addressed to the terminal 3 is, for example, an instruction to enable or disable a communication function using a route other than the wireless multi-hop network shown in FIG.
  • the instruction addressed to the terminal 3 is not limited to these.
  • each of the plurality of aggregation devices 2 holds a first entry list indicating subordinate terminals 3 among the plurality of terminals 3, and the upper server 1 to the first aggregation device, which is one of the plurality of aggregation devices 2 .
  • the first aggregation apparatus Upon receiving the above-described instruction, the first aggregation apparatus transmits the above-described instruction to the second aggregation apparatus, which is another aggregation apparatus 2, if the destination terminal is not included in the first entry list.
  • the second aggregation device receives the above-described instruction, it uses the received instruction to generate an instruction addressed to the destination terminal and transmits the instruction to the destination terminal.
  • each of the plurality of aggregation devices 2 transmits the first entry list to the other aggregation device 2, and each of the plurality of aggregation devices 2 receives the first entry list from the other aggregation device 2.
  • the first entry list is associated with the other aggregating device 2 of the transmission source and held as a second entry list.
  • the first aggregation device receives the above-described instruction from the upper server 1 if the destination terminal is not included in the first entry list and the destination terminal is included in the second entry list, the destination terminal corresponds to the second entry list.
  • aggregating device 2 is selected as the second aggregating device, and the received instruction is transmitted to the selected second aggregating device.
  • FIG. 10 is a chart diagram showing an example of a procedure for transmitting an instruction to terminal 3 in the communication system of the present embodiment.
  • the host server 1 holds the entry list corresponding to the state shown in FIG. 3-11 is subordinate to the aggregation device 2-2.
  • the host server 1 transmits an instruction addressed to the terminal 3-4 to the aggregation device 2-1 (step S31).
  • the aggregation device 2-1 Upon receiving the instruction addressed to the terminal 3-4, the aggregation device 2-1 refers to the first entry list and the second entry list (step S32). The aggregation device 2-1 determines that the terminal 3-4 is included in the first entry list, and transmits an instruction addressed to the terminal 3-4 to the terminal 3-4 (step S33).
  • the upper server 1 transmits an instruction addressed to the terminal 3-11 to the aggregation device 2-1 (step S34).
  • the aggregation device 2-1 Upon receiving the instruction addressed to the terminal 3-11, the aggregation device 2-1 refers to the first entry list and the second entry list (step S35). Since the terminal 3-11 is included in the second entry list, the aggregation device 2-1 transmits an instruction addressed to the terminal 3-11 to the aggregation device 2-2 corresponding to the second entry list (step S36).
  • the aggregation apparatus 2-2 transmits the instruction addressed to the terminal 3-11 to the terminal 3-11 (step S37).
  • the load on the host server 1 can be reduced by cooperating with the aggregation devices 2-1 and 2-2 not only for recollection requests but also for general instructions addressed to the terminal 3.
  • FIG. 11 is a flow chart showing an example of a processing procedure when an instruction addressed to the terminal 3 is received from the host server 1 in the aggregation device 2 of the present embodiment.
  • the aggregation device 2 determines whether or not it has received a signal addressed to the terminal 3 from the host server 1 (step S41). Specifically, the control processing unit 23 determines whether or not a signal indicating an instruction addressed to the above-described terminal 3 has been received from the host server 1 via the second transmitting/receiving unit 24 . If a signal addressed to the terminal 3 has not been received from the upper server 1 (step S41 No), the aggregation device 2 repeats the process of step S41.
  • step S41 Yes When a signal addressed to terminal 3 is received from upper server 1 (step S41 Yes), aggregation device 2 determines whether destination terminal 3 is included in the first entry list (step S42). Specifically, the control processing unit 23 refers to the first entry list stored in the storage unit 25, and determines whether or not the terminal 3, which is the destination of the signal, is included in the first entry list.
  • step S42 Yes the aggregation device 2 refers to the route information and transmits a signal to the destination terminal 3 (step S43), and the processing from step S41 is performed. repeat. Specifically, in step S ⁇ b>43 , the control processing unit 23 instructs the communication control unit 22 to transmit a signal addressed to the terminal 3 to the terminal 3 .
  • the communication control unit 22 refers to the route information in the storage unit 25, adds the downlink route to the destination terminal 3 to the signal, and adds the downlink route to the destination terminal 3. 3, the signal with the downstream route is transmitted.
  • the aggregation device 2 determines whether the destination terminal 3 is included in the second entry list (step S44). Specifically, the control processing unit 23 refers to the second entry list stored in the storage unit 25 and determines whether or not the terminal 3 to which the signal is addressed is included in the second entry list.
  • step S44 Yes the aggregation device 2 transmits a signal to the aggregation device 2 corresponding to the second entry list that includes the destination terminal 3 (step S45). , the processing from step S41 is repeated.
  • step S45 more specifically, the control processing unit 23 identifies the second entry list including the destination terminal 3 from among the second entry lists stored in the storage unit 25, A signal is transmitted to the corresponding aggregation device 2 via the second transmission/reception unit 24 .
  • step S44 No If the destination terminal 3 is not included in the second entry list (step S44 No), the aggregation device 2 notifies the upper server 1 of an error (step S46), and repeats the processing from step S41.
  • step S46 more specifically, the control processing unit 23 transmits to the host server 1 a signal indicating that the transmission of the signal addressed to the terminal 3 has failed.
  • the aggregating device 2 that has the terminal 3 under its control When the aggregating device 2 that has the terminal 3 under its control is changed to an adjacent aggregating device 2 by the aggregating device 2 performing the operation illustrated in FIG. can transmit a signal to the terminal 3.
  • the aggregation device 2 that has the terminal 3 under its control is changed, the aggregation device 2 before the change and the aggregation device 2 after the change are likely to be adjacent to each other. etc., there is a possibility that changes will be made between non-adjacent aggregation devices 2 .
  • the transmission destination of the first entry list to be set in the aggregation device 2 not only the adjacent aggregation device 2 but also the aggregation devices 2 within a certain distance or up to a certain number of consecutive devices should be set.
  • the processing load on the host server 1 can be reduced by cooperating between the consolidating devices 2 .
  • each of the plurality of aggregation devices 2 receives the first information from another aggregation device 2 among the plurality of aggregation devices 2, and uses the first information to obtain the second information. generating and transmitting the second information to a device within the communication system;
  • the communication program of the present embodiment includes, for example, a step of receiving first information from another aggregating device 2 in the aggregating device 2 in the communication system of the present embodiment, and a step of receiving second information using the first information. and transmitting the second information to a device in the communication system.
  • the first information is an instruction addressed to the terminal 3 received by the aggregating device 2 from another aggregating device 2, and the second information is transmitted to the terminal 3 by the aggregating device 2 that received the first information. It is an instruction addressed to the terminal 3 to send the second information, and the transmission destination of the second information is the terminal 3 to which the instruction is directed. More specifically, in the present embodiment, each aggregating device 2 transmits the first entry list to other aggregating devices 2 and holds the first entry list received from the other aggregating device as a second entry list. , when the terminal 3 to which the signal received from the upper server 1 is addressed is included in the second entry list, the signal is transmitted to another corresponding aggregation device.
  • the coordination between the aggregation devices 2 eliminates the need for the upper server 1 to search for the aggregation device 2 and to send instructions addressed to the terminal 3 to the aggregation device 2 again, reducing the load on the upper server 1. can be reduced.
  • FIG. 12 is a diagram illustrating a configuration example of a communication system according to a second embodiment;
  • the communication system of the present embodiment has a relay device 7 added to the communication system of the first embodiment.
  • Components having functions similar to those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and overlapping descriptions are omitted. Differences from the first embodiment will be mainly described below.
  • the communication system of this embodiment includes the relay device 7 that relays communication between the aggregation devices 2 .
  • the relay device 7 relays communication between the aggregation devices 2 .
  • the aggregation device 2 and the relay device 7 communicate via a communication network.
  • the communication network is for example an IP network.
  • FIG. 13 is a diagram showing a configuration example of the relay device 7 of this embodiment.
  • the relay device 7 includes a transmission/reception section 71 , a transfer processing section 72 and a storage section 73 .
  • the storage unit 73 stores, for each aggregation device 2 , aggregation device information in which information indicating the aggregation device 2 to which data received from the aggregation device 2 is to be sent is stored.
  • the data transmission destination aggregating device 2 is, for example, the adjacent aggregating device 2, but is not limited to the adjacent aggregating device 2, like the transmission destination of the first entry list in the first embodiment.
  • the aggregation device information may be set in advance, or may be set from the host server 1 so that the relay device 7 can communicate with the host server 1 and can be set from the host server 1 .
  • the transmission/reception section 71 Upon receiving data from the aggregation device 2 , the transmission/reception section 71 outputs the data to the transfer processing section 72 .
  • the transfer processing unit 72 Upon receiving data from the transmission/reception unit 71, the transfer processing unit 72 refers to the aggregation apparatus information stored in the storage unit 73 if the data does not specify the aggregation apparatus 2 as the transmission destination. specifies the destination aggregating device 2 corresponding to the aggregating device 2 of .
  • the transfer processing unit 72 transmits the received data to the identified aggregation device 2 via the transmission/reception unit 71 .
  • the transfer processing unit 72 transmits the data to the specified transmission destination aggregation device 2 via the transmission/reception unit 71 . do.
  • the operations of the aggregating device 2 are performed except that the transmission of the first entry list and the instruction to the terminal 3 to the other aggregating device 2 is performed via the relay device 7 instead of via the wireless multi-hop network.
  • the aggregation device 2 grasps the network address of the relay device 7 that relays communication.
  • the network address of the relay device 7 may be set in advance or notified from the host server 1 .
  • the aggregating device 2 does not have to be preset with the aggregating device 2 as the transmission destination of the first entry list.
  • MQTT Message Queue Telemetry Transport
  • MQTT uses a device called an MQTT broker that relays messages.
  • the relay device 7 is provided with the function as this MQTT broker.
  • MQTT uses a tag called a topic that specifies a destination to a message to be sent, and sends the message to the relay device 7 .
  • the aggregation device 2 when the aggregation device 2 transmits a message to a plurality of destinations, it adds a plurality of topics corresponding to the destinations and transmits the message to the relay device 7 . As a result, the aggregating device 2 does not need to send a message multiple times for each destination, and only needs to add multiple topics and transmit the message to the relay device 7 once. Topics generally have a hierarchical structure that is embodied from left to right. Device 2 can also send a message with the topic "/IoT/0001/#" to send a message to all aggregating devices 2 with group number 0001.
  • the topic can be For example, if "/IoT/0003/ID-0002" is set, a message can be sent to the aggregation device 2 with ID-0002 whose group number is 0003. Also, all messages are sent to the relay device 7, which is an MQTT broker. Since each message is sent and received via the network, when it is desired to monitor each message, it is sufficient to refer to the message sent and received by the relay device 7 without referring to the message sent and received by each aggregation device 2. Therefore, the operation can be made more efficient. Also, since MQTT has less header information than HTTP (Hyper Text Transfer Protocol), it is possible to reduce the amount of communication.
  • HTTP Hyper Text Transfer Protocol
  • the aggregating device 2 After updating the first entry list, the aggregating device 2 transmits the first entry list to the other aggregating device 2 via the relay device 7, and also transmits the first entry list from the other aggregating device 2 via the relay device. is received, it is stored in the storage unit 25 as a second entry list.
  • FIG. 14 is a chart showing an example of a recollection procedure in the communication system of this embodiment. Similar to the example shown in FIG. 9, FIG. 14 shows an example in which the terminal 3-11 is changed from being under the aggregation device 2-1 to being under the aggregation device 2-2. Steps S11 to S18 are the same as in the first embodiment. Since the terminal 3-11 is not included in the first entry list and the terminal 3-11 is included in the second entry list corresponding to the aggregation device 2-2, the aggregation device 2 transmits the aggregation device 2-2. A re-collection request is sent to the relay apparatus 7, specifying the terminal 3-11 first and instructing the re-collection of the terminal 3-11 (step S19a). Upon receiving the recollection instruction, the relay device 7 transmits a recollection request to the aggregation device 2-2, which is the designated destination (step S19b). Steps S20 to S23 are the same as in the first embodiment.
  • a re-collection request has been described as an example, but as in the first embodiment, for instructions addressed to the terminal 3 other than the re-collection request, the aggregating device 2 receives the received instruction from the destination terminal 3. is included in the second entry list, the instruction addressed to the terminal 3 is transferred to the corresponding aggregation device 2 via the relay device 7 .
  • a plurality of relay devices 7 may be provided when a large number of aggregation devices 2 are provided. For example, when 100 aggregation devices 2 are provided, five relay devices 7 are provided, the aggregation devices 2 are divided into five groups, and one relay device 7 performs relay within one group. good too. Further, in this case, when the adjacent aggregation devices 2 are divided into two groups, the communication between the adjacent aggregation devices 2 may be relayed by performing communication between the relay devices 7 . That is, communication between the aggregation devices 2 may be relayed by a plurality of relay devices 7 .
  • the aggregation device 2 designates the transmission destination aggregation device 2 when transmitting an instruction addressed to the terminal 3 to another aggregation device 2. 2, it is also possible to define an aggregating device 2 for each area, designate an area, and transmit the instruction to the relay device 7 .
  • the correspondence between the area and the aggregation device 2 is determined in advance, and the relay device 7 transmits an instruction addressed to the terminal 3 with the identification information indicating the area as the destination.
  • an instruction addressed to the terminal 3 is transmitted to a plurality of aggregation devices 2.
  • the aggregation device 2 that receives the instruction addressed to the terminal 3 and the destination terminal 3 of the received instruction hold If it is not included in the first entry list, the instruction may be discarded.
  • the transmission/reception unit 71 of the relay device 7 of this embodiment is implemented by a receiver and a transmitter.
  • the transfer processing unit 72 of this embodiment is implemented by the processing circuit described in the first embodiment.
  • the processing circuit may be dedicated hardware, or may be the control circuit 100, as in the first embodiment.
  • the storage unit 73 is implemented by a memory. This memory may be part of the memory 102 of the control circuit 100 or may be provided separately from the memory 102 .
  • each of the plurality of aggregation devices 2 receives the first information from another aggregation device 2 among the plurality of aggregation devices 2, generates the second information using the first information, and 2. Send the information to a device in the communication system.
  • each of the multiple aggregation devices 2 transmits the first information to another aggregation device 2 of the multiple aggregation devices 2 via the relay device 7 .
  • the first information is an instruction addressed to the terminal 3 received by the aggregating device 2 from another aggregating device
  • the second information is an instruction to the terminal 3 from the aggregating device 2 that received the first information.
  • each aggregating device 2 transmits the first entry list to the other aggregating device 2 via the relay device 7, and receives the first entry list from the other aggregating device via the relay device 7.
  • the first entry list is held as a second entry list, and when the terminal 3 to which the signal received from the upper server 1 is addressed is included in the second entry list, the signal is sent to the other corresponding aggregation device.
  • the same effect as in the first embodiment is obtained, and the communication band of the wireless multi-hop network does not need to be used for communication between the aggregating devices 2, and the communication band of the wireless multi-hop network is suppressed compared to the first embodiment. can do.
  • the aggregation device 2 can cooperate with other aggregation devices 2 by communicating with the relay device 7. can do.
  • FIG. 15 is a diagram showing a configuration example of a relay device according to this embodiment.
  • the communication system of the present embodiment is the same as the communication system of the second embodiment except that the relay device 7a shown in FIG. 15 is provided instead of the relay device 7.
  • FIG. Components having functions similar to those of the second embodiment are denoted by the same reference numerals as those of the second embodiment, and overlapping descriptions are omitted. Differences from the second embodiment will be mainly described below.
  • the aggregation device 2 communicates with other aggregation devices 2 via the relay device 7 .
  • the relay device 7a of the present embodiment stores the first entry list received from each aggregation device 2 as an entry list in association with the identification information of the transmission source aggregation device 2 . If the destination terminal 3 of the instruction received from the upper server 1 is not under its control, the aggregation apparatus 2 transmits the instruction to the relay apparatus 7a. Then, when the relay device 7a is notified of the instruction addressed to the terminal 3 from the aggregation device 2, the relay device 7a extracts the entry list including the terminal 3 as the destination of the instruction, thereby adding the aggregation device 2 having the destination terminal 3 under its control. It selects and transmits an instruction addressed to the terminal 3 to the selected aggregating device 2 .
  • the relay device 7a includes a transmission/reception section 71, a transfer processing section 72a, and a storage section 73a.
  • the transmitting/receiving section 71 is the same as that of the first embodiment.
  • the storage unit 73a stores the aggregation device information and the entry list in the same manner as in the first embodiment.
  • the transfer processing unit 72a When the transfer processing unit 72a receives the first entry list from the aggregation device 2 via the transmission/reception unit 71, it associates it with the identification information of the transmission source aggregation device 2 and stores it in the storage unit 73a as an entry list. When the transfer processing unit 72a receives an instruction addressed to the terminal 3 from the aggregation device 2 via the transmission/reception unit 71, the transfer processing unit 72a refers to the aggregation device information in the storage unit 73a and aggregates the transmission destinations corresponding to the transmission source aggregation device 2. A device 2 is identified, and an entry list corresponding to the identified aggregation device 2 is extracted.
  • the transfer processing unit 72a selects, from the extracted entry list, the aggregation device 2 corresponding to the entry list including the terminal 3 of the destination of the received instruction, and transfers the data to the selected aggregation device 2 via the transmission/reception unit 71. An instruction addressed to terminal 3 is transmitted.
  • the storage unit 73a stores the aggregation device information
  • the transfer processing unit 72a uses the aggregation device information to specify the transmission destination aggregation device 2.
  • the transfer processing unit 72a does not use the aggregation device information.
  • the entry list including the destination terminal 3 of the received instruction may be extracted by searching the entry list for each of all the aggregation devices 2 stored in the storage unit 73a.
  • the operation of the aggregating device 2 does not need to receive the second entry list and store the second entry list, and does not need to perform processing using the second entry list. It is the same.
  • FIG. 16 is a chart showing an example of a recollection procedure in the communication system of this embodiment. Similar to the example shown in FIG. 9, FIG. 16 shows an example in which the terminal 3-11 is changed from being under the aggregation device 2-1 to being under the aggregation device 2-2.
  • Step S11 is the same as in the first embodiment.
  • the aggregation device 2 refers to the first entry list (step S12a).
  • Steps S13 to S18 are the same as in the first embodiment. Since the terminal 3-11 is not included in the first entry list, the aggregation device 2-1 transmits a recollection request for instructing recollection of the terminal 3-11 to the relay device 7a (step S51).
  • the aggregation device 2 when the terminal 3, which is the destination of the instruction to the terminal 3 received from the upper server 1, including the recollection request, is not included in the first entry list, the aggregation device 2 The instruction is transferred to the relay device 7a.
  • the relay device 7a Upon receiving the recollection request, the relay device 7a selects the aggregation device 2 to which the recollection request is sent (step S52). Specifically, the relay device 7a refers to the aggregation device information, identifies the destination aggregation device 2 corresponding to the transmission source aggregation device 2, and selects the entry list corresponding to the identified aggregation device 2. Selects the aggregation device 2 corresponding to the entry list including the terminal 3 of the destination of the instruction. Then, the relay device 7a transmits a re-collection request to the aggregation device 2-2, which is the selected aggregation device 2 (step S53). Steps S20 to S23 are the same as in the first embodiment.
  • a re-collection request has been described as an example, but as in the second embodiment, for instructions addressed to the terminal 3 other than the re-collection request, the aggregating device 2 sends the received instructions to the relay device 7a. By transmitting, the instruction addressed to the terminal 3 can be transferred to the corresponding aggregation device 2 via the relay device 7a.
  • FIG. 17 is a flow chart showing an example of a processing procedure regarding instructions addressed to the terminal 3 in the relay device 7a of the present embodiment.
  • the transfer processing unit 72a of the relay device 7a determines whether or not an instruction addressed to the terminal 3 is received via the transmission/reception unit 71 (step S61). If no instruction addressed to terminal 3 has been received (step S61 No), the transfer processing unit 72a repeats step S61.
  • the transfer processing unit 72a searches the entry list including the terminal 3 that is the destination of the instruction and selects the aggregation device 2 (step S62). Specifically, the transfer processing unit 72a refers to the aggregation device information in the storage unit 25, identifies the destination aggregation device 2 corresponding to the transmission source aggregation device 2, and The aggregating device 2 is selected by extracting the list and retrieving the entry list including the terminal 3 of the destination of the received instruction from the extracted entry list.
  • the transfer processing unit 72a transmits an instruction to the selected aggregation device via the transmission/reception unit 71 (step S63), and repeats the processing from step S61.
  • each of the plurality of aggregation devices 2 holds a first entry list indicating subordinate terminals 3 among the plurality of terminals 3, and each of the plurality of aggregation devices 2 stores the first entry list as the relay device 7a.
  • the relay device 7a stores the first entry list in association with the aggregation device 2 that is the transmission source.
  • a host server 1 transmits an instruction for a destination terminal, which is one of a plurality of terminals 3, to a first aggregation device, which is one of a plurality of aggregation devices 2, and the first aggregation device transmits the instruction.
  • the received instruction is transmitted to the relay device 7a.
  • the relay device 7a Upon receiving the instruction, if the destination terminal is included in the held first entry list, the relay device 7a selects the aggregation device 2 corresponding to the first entry list as the second aggregation device, and selects the selected second aggregation device. Send instructions to the aggregator.
  • the relay device 7a since the relay device 7a holds the entry list of each aggregation device 2, the aggregation device 2 does not need to hold the second entry list. Also in this embodiment, a plurality of relay devices 7a may be provided as described in the second embodiment.
  • the relay device 7a may transmit the received entry list to the corresponding destination aggregation device 2 based on the aggregation device information. For example, the following processing may be performed in combination with the second embodiment. Based on the aggregation device information, the relay device 7a transmits the received entry list to the corresponding transmission destination aggregation device 2, and the aggregation device 2 holds the entry list received from the relay device 7a as the second entry list. Then, when receiving the instruction addressed to the terminal 3, the aggregating device 2 designates the aggregating device 2 as the transmission destination if the destination terminal 3 is not included in the first entry list but is included in the second entry list.
  • the relay device 7a Upon receiving the instruction addressed to the terminal 3, the relay device 7a transfers the instruction addressed to the terminal 3 to the destination aggregation device 2 if the destination is specified, and if the destination is not specified, It searches the entry list it holds, selects the aggregation device 2 corresponding to the destination terminal 3 , and transfers the instruction addressed to the terminal 3 to the selected aggregation device 2 .
  • the transfer processing unit 72a of the relay device 7a of the present embodiment is realized by the processing circuit described in the first embodiment.
  • the processing circuit may be dedicated hardware, or may be the control circuit 100, as in the first embodiment.
  • the storage unit 73a is implemented by a memory. This memory may be part of the memory 102 of the control circuit 100 or may be provided separately from the memory 102 .
  • each of the plurality of aggregation devices 2 receives the first information from another aggregation device 2 among the plurality of aggregation devices 2, generates the second information using the first information, and 2. Send the information to a device in the communication system. However, transmission/reception of the first information is performed via the relay device 7a. Also in this embodiment, for example, the first information is an instruction addressed to the terminal 3 received by the aggregating device 2 from another aggregating device, and the second information is an instruction to the terminal 3 from the aggregating device 2 that received the first information. The instruction is directed to the terminal 3 to be transmitted, and the transmission destination of the second information is the terminal 3 to which the instruction is directed.
  • each aggregation device 2 transmits the first entry list to the relay device 7a, and the relay device 7a associates the received first entry list with the transmission source aggregation device 2. and keep it as an entry list. Then, when the terminal 3 to which the signal received from the upper server 1 is addressed is not included in the first participation list, the aggregation device 2 transfers the signal to the relay device 7a, and the relay device 7a holds the signal. An aggregation device 2 is selected using the entry list, and the signal is transferred to the selected aggregation device 2 . As a result, the same effect as in the second embodiment can be obtained, and the processing of the aggregation device 2 can be reduced compared to the second embodiment.
  • FIG. 18 is a chart showing an example of regular collection processing in the communication system of this embodiment.
  • the configuration of the communication system of this embodiment is the same as that of the second embodiment.
  • Components having functions similar to those of the second embodiment are denoted by the same reference numerals as those of the second embodiment, and overlapping descriptions are omitted. Differences from the second embodiment will be mainly described below.
  • Embodiments 1 to 3 the operation when the aggregation device 2 receives an instruction addressed to the terminal 3 from the upper server 1 has been described. In this embodiment, cooperation between the aggregation devices 2 in regular collection will be described.
  • FIG. 18 shows an example in which periodic collection is performed in the second state described in FIG. 7 of the first embodiment.
  • each terminal 3 under the control of the aggregation device 2-1 including the terminals 3-4 and 3-8, transmits meter data to the aggregation device 2-1 at regular transmission intervals ( Steps S71, S72).
  • FIG. 18 illustrates transmission of meter data from terminals 3-4 and 3-8, other terminals 3 under control of the aggregation device 2-1 similarly transmit meter data to the aggregation device 2-1. do.
  • the aggregation device 2-1 aggregates the meter data received from the terminals 3 under its control (step S73).
  • each terminal 3 under the control of the aggregation device 2-2 transmits meter data to the aggregation device 2-2 at regular transmission intervals (step S74).
  • FIG. 18 illustrates transmission of meter data from the terminal 3-11
  • other terminals 3 under the control of the aggregation device 2-2 similarly transmit meter data to the aggregation device 2-2.
  • the aggregation device 2-2 aggregates the meter data received from the terminals 3 under its control (step S75), and transmits the aggregated meter data to the relay device 7 (step S76).
  • the relay device 7 transmits the received aggregated meter data to the aggregation device 2-1 (step S77).
  • the relay device 7 holds correspondence between the aggregation device 2 that is the transmission source of the aggregated meter data and the aggregation device 2 that is the transmission destination of the aggregated meter data. This correspondence may be set in advance or may be instructed from the host server 1 . Alternatively, the aggregation device 2 that is the transmission source of the aggregated meter data holds information indicating the transmission destination aggregation device 2, and the transmission destination is specified when the aggregated meter data is transmitted to the relay device 7. good too.
  • the aggregation device 2-1 When the aggregation device 2-1 receives the aggregated meter data from the aggregation device 2-2 via the relay device 7, the aggregation device 2-1 further aggregates the meter data aggregated in step S73 and the received meter data. (Step S78). Specifically, the control processing unit 23 connects the meter data aggregated in step S73 with the meter data received from the aggregation device 2-2 via the first transmission/reception unit 21 and the communication control unit 22, thereby reaggregating the data. do.
  • the aggregation device 2-1 transmits the re-aggregated meter data to the host server 1 (step S79). Specifically, the control processing unit 23 transmits the re-aggregated meter data to the host server 1 via the second transmission/reception unit 24 .
  • each aggregation device 2 transmits the aggregated meter data to the host server 1, so the host server 1 receives the meter data from all the aggregation devices 2 at regular transmission intervals. need to be processed.
  • the aggregation device 2-2 transmits the aggregated meter data to the aggregation device 2-1 via the relay device 7, and the aggregation device 2-1 receives the meter data by the aggregation device 2-2.
  • the host server 1 can reduce the frequency of meter data reception processing, and the load on the host server 1 can be reduced.
  • meter data aggregated by two aggregation devices 2 are reaggregated by one aggregation device 2 that is a representative aggregation device. 2, and one aggregation device 2 re-aggregates the meter data.
  • a representative aggregation device which is a part of a plurality of aggregation devices 2, receives a notification from at least some of the plurality of aggregation devices 2 other than the representative aggregation device 2. receives meter data collected from as the first information.
  • the representative aggregation device generates second information by reaggregating the first information and the meter data collected from the terminals 3 under the representative aggregation device, and transmits the second information to the host server 1 .
  • meter data aggregated by two or more aggregation devices 2 may be reaggregated by one aggregation device 2 and transmitted to the host server 1 .
  • the aggregation device 2 shown in FIG. 18 may be linked. Further, when the aggregation device 2 is not coordinated with respect to the instruction addressed to the terminal 3 and the aggregation device 2 is coordinated as shown in FIG. It may also be done over a wireless multi-hop network.
  • each of the plurality of aggregation devices 2 receives the first information from another aggregation device 2 among the plurality of aggregation devices 2, generates the second information using the first information, and 2. Send the information to a device in the communication system. However, transmission/reception of the first information is performed via the relay device 7 .
  • the first information is aggregated meter data received by the aggregation device 2 from other aggregation devices, and the second information is aggregated again by the aggregation device 2 that received the first information. This is meter data, and the transmission destination of the second information is the host server 1 .
  • meter data aggregated by two or more aggregation devices 2 are reaggregated by one aggregation device 2, and the reaggregated meter data is sent to the host server 1. set to send. As a result, the load on the host server 1 can be reduced.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Alarm Systems (AREA)

Abstract

Un système de communication selon la présente divulgation comprend : un réseau à sauts multiples sans fil composé de dispositifs d'intégration (2-1, 2-2) qui sont une pluralité de dispositifs d'intégration et de terminaux (3-1 à 3-12) qui transmettent des données de liaison montante à l'un des dispositifs d'intégration (2-1, 2-2) ; un serveur hôte (1) qui collecte les données de liaison montante provenant des dispositifs d'intégration (2-1, 2-2) ; et un dispositif relais (7) qui relaie une communication entre les dispositifs d'intégration (2-1, 2-2). Le dispositif d'intégration (2-2) reçoit une demande de nouvelle collecte constituée de premières informations provenant de l'autre dispositif d'intégration (2-1) par l'intermédiaire du dispositif relais (7), génère, à l'aide de la demande de nouvelle collecte, une demande de nouvelle collecte à transmettre au terminal de destination (3-11), et transmet la demande de nouvelle collecte au terminal (3-11).
PCT/JP2021/029157 2021-08-05 2021-08-05 Système de communication, dispositif d'intégration, dispositif relais, procédé de communication et programme de communication WO2023012978A1 (fr)

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JP2022523720A JP7214049B1 (ja) 2021-08-05 2021-08-05 通信システム、集約装置、中継装置、通信方法および通信プログラム
PCT/JP2021/029157 WO2023012978A1 (fr) 2021-08-05 2021-08-05 Système de communication, dispositif d'intégration, dispositif relais, procédé de communication et programme de communication
TW111128535A TWI818650B (zh) 2021-08-05 2022-07-29 通訊系統、集中裝置、中繼裝置、通訊方法及記錄媒體

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