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WO2019159348A1 - Dispositif de traitement d'informations, nœud, système de communication sans fil et procédé de commande de réseau sans fil - Google Patents

Dispositif de traitement d'informations, nœud, système de communication sans fil et procédé de commande de réseau sans fil Download PDF

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Publication number
WO2019159348A1
WO2019159348A1 PCT/JP2018/005672 JP2018005672W WO2019159348A1 WO 2019159348 A1 WO2019159348 A1 WO 2019159348A1 JP 2018005672 W JP2018005672 W JP 2018005672W WO 2019159348 A1 WO2019159348 A1 WO 2019159348A1
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WIPO (PCT)
Prior art keywords
node
group
relay
information processing
nodes
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Ceased
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English (en)
Japanese (ja)
Inventor
康志 栗原
浩一郎 山下
鈴木　貴久
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Fujitsu Ltd
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Fujitsu Ltd
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Priority to PCT/JP2018/005672 priority Critical patent/WO2019159348A1/fr
Priority to JP2019571932A priority patent/JP6939917B2/ja
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Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08—User group management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • 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
    • 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 invention relates to an information processing device, a node, a wireless communication system, and a wireless network control method.
  • nodes which are wireless communication apparatuses, are installed in a measurement target, and data acquired by each node is transmitted to an information processing apparatus by wireless communication.
  • Sensor Network System Sensor Network System
  • Each node measures the state of the measurement target and transmits it as data by wireless communication.
  • the information processing apparatus collects data measured at each node.
  • the information processing apparatus includes an aggregator and a gateway (GW), and the aggregator transmits the collected data to the GW, and the GW transmits the collected data to the user terminal.
  • the user terminal monitors the state of the measurement target based on the collected data.
  • measurement objects include cliffs, roads, and buildings.
  • an application example of WSNS is monitoring of a landslide.
  • an application example of WSNS includes monitoring of distortion and cracks.
  • each node is installed at a distance, and the radio wave reachable distance of wireless communication is limited. Therefore, a relay node is used as a relay node between the measurement node that measures the state of the measurement target and the information processing apparatus. Multi-hop communication is employed in which data is relayed between neighboring nodes. Thereby, the information processing apparatus can collect the data measured by the measurement node via the relay node using multi-hop communication between nodes in the WSNS.
  • each node is equipped with a battery, and each node is operated by the power of the battery. Therefore, the power that can be used by wireless communication is limited in each node. For example, each node does not have enough power to communicate directly with the information processing apparatus. Therefore, each node executes an intermittent operation that starts when necessary. In the intermittent operation, an operation section that operates at a fixed time and a stop section that stops the operation at a fixed time are periodically repeated. For example, the measurement node measures data in the operation interval, and the relay node relays data measured in the measurement node using multi-hop communication in the operation interval.
  • the information processing apparatus (aggregator, GW) operates constantly, power consumption increases.
  • the information processing apparatus can also reduce power consumption by executing an intermittent operation in the same manner as each node (measurement node, relay node).
  • JP 2010-1114898 A Japanese Patent Laying-Open No. 2015-177283 JP 2008-245102 A
  • the information processing device for example, the aggregator
  • the relay node executes an intermittent operation that periodically repeats the operation interval and the stop interval using an internal timer
  • the internal timer of the information processing device and the relay node is used.
  • the relay node relays data measured by the measurement node using multi-hop communication in the operation interval, and the information processing apparatus collects data relayed from the relay node in the operation interval. .
  • the relay node stands by as a standby state for multihop communication in the operation section.
  • the information processing apparatus for example, an aggregator
  • the relay node transmits data according to the data transmission command from the information processing apparatus.
  • the method shown in FIG. 29 solves the problem shown in FIG. 28, that is, the problem that the information processing apparatus cannot collect data relayed from the relay node in the operation section.
  • the power consumption of the relay node increases due to the standby state as compared to the case shown in FIG.
  • the relay node stands by in a standby state without waiting for reception.
  • the relay node turns on the transmission / reception unit, for example, once every several tens of seconds, transmits a beacon, and waits for reception for several seconds when the beacon is transmitted.
  • An information processing device for example, an aggregator constructs a network for a relay node that has transmitted a beacon at the time of activation (operation period), and transmits a data transmission command to the relay node.
  • the relay node transmits data in response to a data transmission command from the information processing apparatus. Accordingly, in the method shown in FIG.
  • the technology disclosed in this application avoids data collection problems while reducing power consumption.
  • the information processing apparatus collects data from a node that performs an intermittent operation that periodically repeats an operation interval and a sleep interval.
  • the information processing apparatus includes a group setting unit and an operation control unit.
  • the group setting unit sets the same group for nodes whose mutual communication quality is a certain value or more.
  • the operation control unit collects data from the nodes set in the duty node that is the operation section among the nodes in the group.
  • FIG. 1 is a schematic diagram illustrating an example of a configuration of a wireless communication system according to the first embodiment.
  • FIG. 2 is a block diagram illustrating an example of a configuration of a node of the wireless communication system according to the first embodiment.
  • FIG. 3 is an explanatory diagram illustrating an example of the transition of the remaining battery level of the node in the wireless communication system according to the first embodiment.
  • FIG. 4 is a block diagram illustrating an example of the configuration of the information processing apparatus of the wireless communication system according to the first embodiment.
  • FIG. 5 is an explanatory diagram of an example of the network construction process and the group setting process in the wireless communication system according to the first embodiment.
  • FIG. 6 is an explanatory diagram of an example of the buffering upper limit setting process in the wireless communication system according to the first embodiment.
  • FIG. 7 is an explanatory diagram of an example of operation processing (data collection) in the wireless communication system according to the first embodiment.
  • FIG. 8 is an explanatory diagram of an example of operation processing (role change) in the wireless communication system according to the first embodiment.
  • FIG. 9 is a timing chart illustrating an example of operation processing (data collection and role change) in the wireless communication system according to the first embodiment.
  • FIG. 10 is an explanatory diagram illustrating the effect of the operation processing in the wireless communication system according to the first embodiment.
  • FIG. 11 is a flowchart illustrating an example of the operation of the wireless communication system according to the first embodiment.
  • FIG. 12 is a flowchart illustrating an example of group setting processing executed by the information processing apparatus as the operation of the wireless communication system according to the first embodiment.
  • FIG. 13 is a flowchart illustrating an example of group setting processing executed by the relay node as the operation of the wireless communication system according to the first embodiment.
  • FIG. 14 is a flowchart illustrating an example of group setting processing executed by the measurement node as the operation of the wireless communication system according to the first embodiment.
  • FIG. 15 is a flowchart illustrating an example of a buffering upper limit setting process executed by the information processing apparatus as the operation of the wireless communication system according to the first embodiment.
  • FIG. 16 is a flowchart illustrating an example of the buffering upper limit setting process executed by the relay node as the operation of the wireless communication system according to the first embodiment.
  • FIG. 17 is a flowchart illustrating an example of operation processing executed by the information processing apparatus as the operation of the wireless communication system according to the first embodiment.
  • FIG. 18 is a flowchart illustrating an example of an operation process performed by the assigned node among the relay nodes as the operation of the wireless communication system according to the first embodiment.
  • FIG. 19 is a flowchart illustrating an example of an operation process executed by a non-assigned node among the relay nodes as the operation of the wireless communication system according to the first embodiment.
  • FIG. 20 is a flowchart illustrating an example of operation processing executed by the measurement node as the operation of the wireless communication system according to the first embodiment.
  • FIG. 21 is a flowchart illustrating an example of group setting processing executed by the information processing apparatus as the operation of the wireless communication system according to the second embodiment.
  • FIG. 22 is a flowchart illustrating an example of the group setting process executed by the assigned node among the relay nodes as the operation of the wireless communication system according to the second embodiment.
  • FIG. 23 is a flowchart illustrating an example of group setting processing executed by a non-assigned node among relay nodes as the operation of the wireless communication system according to the second embodiment.
  • FIG. 24 is a flowchart illustrating an example of an operation process performed by the duty node of the relay nodes as the operation of the wireless communication system according to the second embodiment.
  • FIG. 25 is a flowchart illustrating an example of operation processing executed by a non-assigned node among the relay nodes as the operation of the wireless communication system according to the second embodiment.
  • FIG. 26 is a diagram illustrating an example of a hardware configuration of a node.
  • FIG. 27 is a diagram illustrating an example of a hardware configuration of the information processing apparatus.
  • FIG. 28 is an explanatory diagram illustrating an example of problems in the intermittent operation of the information processing apparatus and the relay node.
  • FIG. 29 is an explanatory diagram illustrating an example of problems in the intermittent operation of the information processing apparatus and the relay node.
  • FIG. 30 is an explanatory diagram illustrating an example of a problem in the intermittent operation of the information processing apparatus and the relay node.
  • FIG. 1 is a schematic diagram illustrating an example of a configuration of a wireless communication system 1 according to the first embodiment.
  • a wireless communication system 1 illustrated in FIG. 1 is configured by, for example, WSNS, and includes a plurality of nodes 2 that are wireless communication devices, a gateway (GW) 3, and an aggregator 4.
  • GW gateway
  • aggregator 4 an aggregator 4
  • 31 nodes 2 are installed (hereinafter also referred to as nodes 2-1 to 2-31).
  • Each node 2 measures the state of the measurement target and transmits it as data by wireless communication.
  • the aggregator 4 is a communication device that establishes communication connection between each node 2 and the GW 3.
  • the aggregator 4 is an apparatus that collects data transmitted from each node 2, for example, an information processing apparatus such as a server.
  • the aggregator 4 transmits the collected data to the GW 3, and the GW 3 transmits the collected data to the user terminal.
  • the user terminal monitors the state of the measurement target based on the collected data.
  • one apparatus that integrates the functions of the GW 3 and the aggregator 4 may be used as the information processing apparatus 5.
  • Measured objects include cliffs, roads, buildings, etc.
  • an application example of WSNS is monitoring of a landslide.
  • an application example of WSNS includes monitoring of distortion and cracks.
  • each node 2 is installed at a distance, and the radio wave reachable distance of wireless communication is limited. Therefore, between the measurement node that measures the state of the measurement target and the information processing device 5 (aggregator 4, GW3).
  • Multi-hop communication in which a relay node is installed as a relay node and data is relayed between neighboring nodes is employed. Thereby, the information processing apparatus 5 can collect the data measured by the measurement node via the relay node using multi-hop communication between nodes in the WSNS.
  • each node 2 is equipped with a battery, and each node 2 operates by the power of the battery.
  • Each node 2 performs an intermittent operation that starts when necessary.
  • an operation section that operates at a fixed time and a stop section that stops the operation at a fixed time are periodically repeated.
  • the measurement node measures data in the operation interval, and the relay node relays data measured in the measurement node using multi-hop communication in the operation interval.
  • a battery is also mounted on the information processing device 5 (aggregator 4, GW3), and the information processing device 5 is operated by the power of the battery.
  • the information processing apparatus 5 also performs an intermittent operation similarly to each node 2. For example, the information processing apparatus 5 transmits a data request to the relay node at the time of activation (operation section), and the relay node transmits data in response to the data request from the information processing apparatus in the operation section.
  • FIG. 2 is a block diagram illustrating an example of the configuration of the node 2 of the wireless communication system 1 according to the first embodiment.
  • the node 2 illustrated in FIG. 2 includes an MCU (Micro Controller Unit) 200, a sensor element 210, an energy harvesting element 220, a battery 230, a power supply control unit 240, a radio unit 250, and a storage unit 260. .
  • MCU Micro Controller Unit
  • the sensor element 210 is an element that detects the state of the sensing target (measurement target).
  • the energy harvesting element 220 is a power generation element such as a vibration power generation element, a photovoltaic power generation element, a temperature power generation element, or a radio wave power generation element.
  • the battery 230 stores, for example, power generated by the energy harvesting element 220.
  • the power control unit 240 controls the energy harvesting element 220 and the battery 230.
  • the wireless unit 250 performs wireless communication with another node 2 existing within a wireless range of about several tens of centimeters by multi-hop communication.
  • the storage unit 260 has an area for storing various information and programs, and an area for temporarily storing (buffering) data.
  • the MCU 200 controls the entire node 2.
  • FIG. 3 is an explanatory diagram illustrating an example of the transition of the remaining battery level of the node 2 of the wireless communication system 1 according to the first embodiment.
  • the horizontal axis represents time
  • the vertical axis represents the remaining amount of the battery 230 (remaining battery amount).
  • the battery 230 stores (charges) the electric power generated by the energy harvesting element 220.
  • the battery 230 is significantly discharged by the processing of the MCU 200 and the radio unit 250 when the node 2 acquires data, and the node 2 transmits data from time t2 to time t3.
  • the battery 230 charges the electric power generated by the energy harvesting element 220 from time t3 to time t4.
  • the storage unit 260 has a group ID table 261.
  • the group ID table 261 includes a first area for storing an ID for identifying the own node group, a second area for storing an ID for identifying a parent node group of the own node group, and a child node group of the own node group. And a third area for storing an ID for identification. Examples of these IDs include MAC addresses.
  • the node group and ID (group ID) will be described later.
  • the storage unit 260 further includes an LQI table 262.
  • the LQI table 262 is an area for storing the communication quality of data when the current node of the node group receives data transmitted from the node group of the transmission source.
  • the node group includes one turn node and non-turn nodes other than the turn node.
  • the assigned node corresponds to the relay node that has shifted to the intermittent operation period in the node group.
  • the non-assigned node corresponds to the relay node that has shifted to the intermittent operation stop period in the node group.
  • the relay node, duty node, and non-assignment node will be described later.
  • the MCU 200 reads a program stored in the storage unit 260 and configures various processes as functions based on the read program.
  • the MCU 200 includes a group setting unit 201, an upper limit setting unit 202, an operation control unit 203, and a control unit 204.
  • the group setting unit 201 executes a group setting process described later.
  • the upper limit setting unit 202 executes a buffering upper limit setting process described later.
  • the operation control unit 203 executes an operation process described later.
  • the control unit 204 controls operations of the group setting unit 201, the upper limit setting unit 202, and the operation control unit 203.
  • FIG. 4 is a block diagram illustrating an example of the configuration of the information processing device 5 of the wireless communication system 1 according to the first embodiment.
  • the information processing apparatus 5 illustrated in FIG. 4 includes an MCU 500, an energy harvesting element 520, a battery 530, a power supply control unit 540, a communication unit 550, and a storage unit 560.
  • the energy harvesting element 520 is a power generation element such as a vibration power generation element, a photovoltaic power generation element, a temperature power generation element, or a radio wave power generation element.
  • the battery 530 stores, for example, power generated by the energy harvesting element 520.
  • the power control unit 540 controls the energy harvesting element 520 and the battery 530.
  • the communication unit 550 is an interface that performs communication with the node 2 and communication with the user terminal.
  • the storage unit 560 is an area for storing various information and programs.
  • the MCU 500 controls the information processing apparatus 5 as a whole.
  • the information processing device 5 requests data by intermittent operation and collects data.
  • the MCU 500 reads a program stored in the storage unit 560 and configures various processes as functions based on the read program.
  • the MCU 500 includes a group setting unit 501, an upper limit setting unit 502, an operation control unit 503, and a control unit 504.
  • the group setting unit 501 executes a group setting process described later.
  • the upper limit setting unit 502 executes a buffering upper limit setting process described later.
  • the operation control unit 503 executes an operation process described later.
  • the control unit 504 controls operations of the group setting unit 501, the upper limit setting unit 502, and the operation control unit 503. In addition, the control unit 504 executes a network construction process described later.
  • FIG. 5 is an explanatory diagram of an example of the network construction process and the group setting process in the wireless communication system 1 according to the first embodiment.
  • the information processing apparatus 5 (aggregator 4, GW3) divides each node 2 into a measurement node and a relay node as a network construction process.
  • Measurement nodes are installed on measurement objects (also called sensing objects) such as cliffs, roads, and buildings.
  • the measurement node measures the state of the measurement target in the operation section and transmits the data as data by wireless communication.
  • the nodes 2-1, 2-2, 2-5, 2-9, 2-13, 2-23, 2-26, 2-27, 2-28, 2-31 are Set as a measurement node.
  • the relay node is installed between the measurement node and GW3.
  • the relay node relays data measured by the measurement node using multi-hop communication in the operation period, and transmits the data to the GW 3.
  • nodes 2-3 to 2-4, 2-6 to 2-8, 2-10 to 2-12, 2-14 to 2-16, 2-17 to 2-19, 2-20 to 2-22, 2-24 to 2-25, and 2-29 to 2-30 are set as relay nodes.
  • the information processing device 5 (aggregator 4, GW3) groups measurement nodes and relay nodes as group setting processing, and sets a turn node within the group of relay nodes.
  • the nodes 2-1, 2-2, 2-5, 2-9, 2-13, 2-23, 2-26, 2-27, 2-28, 2-31 are assigned the same group ID as a group of measurement nodes.
  • the same group ID is assigned to each of ⁇ 24 to 2-25 and 2-29 to 2-30 as a group of relay nodes.
  • the nodes 2-3 to 2-4 are grouped as relay nodes, and the same group ID is assigned to the nodes 2-3 to 2-4 as the node group NG1.
  • one of the relay nodes 2-3 to 2-4 is set as the duty node (relay node 2-4 in FIG. 5), and the other relay nodes are set as non-assignment nodes (relay in FIG. 5). Node 2-3).
  • the nodes 2-6 to 2-8 are grouped as relay nodes, and the same group ID is assigned to the nodes 2-6 to 2-8 as the node group NG2.
  • one of the relay nodes 2-6 to 2-8 is set as the duty node (relay node 2-7 in FIG. 5), and the other relay nodes are not assigned nodes (relay in FIG. 5). Node 2-6, 2-8).
  • the nodes 2-10 to 2-12 are grouped as relay nodes, and the same group ID is assigned to the nodes 2-10 to 2-12 as the node group NG3.
  • one of the relay nodes 2-10 to 2-12 is set as the duty node (relay node 2-10 in FIG. 5), and the other relay nodes are not assigned nodes (relay in FIG. 5).
  • the nodes 2-14 to 2-16 are grouped as relay nodes, and the same group ID is assigned to the nodes 2-14 to 2-16 as the node group NG4.
  • one of the relay nodes 2-14 to 2-16 is set as the turn node (relay node 2-14 in FIG. 5), and the other relay nodes are not assigned nodes (relay in FIG. 5).
  • Node 2-15, 2-16 are not assigned nodes (relay in FIG. 5).
  • the nodes 2-17 to 2-19 are grouped as relay nodes, and the same group ID is assigned to the nodes 2-17 to 2-19 as the node group NG5.
  • one of the relay nodes 2-17 to 2-19 is set as the turn node (relay node 2-19 in FIG. 5), and the other relay nodes are not assigned nodes (relay in FIG. 5). Node 2-17, 2-18).
  • the nodes 2-20 to 2-22 are grouped as relay nodes, and the same group ID is assigned to the nodes 2-20 to 2-22 as the node group NG6.
  • one of the relay nodes 2-20 to 2-22 is set as the duty node (relay node 2-20 in FIG. 5), and the other relay nodes are not assigned nodes (relay in FIG. 5).
  • the nodes 2-24 to 2-25 are grouped as relay nodes, and the same group ID is assigned to the nodes 2-24 to 2-25 as the node group NG7.
  • one of the relay nodes 2-24 to 2-25 is set as the duty node (relay node 2-25 in FIG. 5), and the other relay nodes are not assigned nodes (relay in FIG. 5). Node 2-24).
  • the nodes 2-29 to 2-30 are grouped as relay nodes, and the same group ID is assigned to the nodes 2-29 to 2-30 as the node group NG8.
  • one of the relay nodes 2-29 to 2-30 is set as the duty node (relay node 2-30 in FIG. 5), and the other relay nodes are not assigned nodes (relay in FIG. 5). Node 2-29).
  • the communication quality of the relay nodes is used.
  • LQI Radio wave communication quality: Link Quality Indicator
  • relay nodes having mutual communication quality of a certain value or more are arranged in a group.
  • the information processing apparatus 5 aggregator 4, GW3 uses the multi-hop communication between the nodes in the WSNS in the operation process described later, and the data measured at the measurement node at the relay nodes arranged in groups. Collect by buffering.
  • details of processing operations of the information processing apparatus 5 and each node in the group setting processing will be described later.
  • FIG. 6 is an explanatory diagram of an example of the buffering upper limit setting process in the wireless communication system 1 according to the first embodiment.
  • the information processing device 5 (aggregator 4, GW3) performs control for setting the buffering upper limit value for each group so that the number of data to be buffered between the groups is as equal as possible as the buffering upper limit setting process. .
  • the information processing apparatus 5 determines the buffering upper limit setting value of each group of relay nodes (node groups NG1 to NG8) and notifies each group of the buffering upper limit setting value. Set the upper limit.
  • the buffering upper limit value can be calculated by the following equation (1).
  • Nu ceil (Nm / Ng) (1)
  • Nu represents the buffering upper limit value
  • Nm represents the number of measurement nodes
  • Ng represents the number of relay node groups (number of node groups).
  • Ceil is a CEIL function (also called a ceiling function), and is an expression for performing processing for rounding up the value of Nm / Ng to an integer.
  • measurement nodes 2-1, 2-2, 2-5, 2-9, 2-13, 2-23, 2-26, 2-27, 2-28, and 2-31 are the measurement targets. Since it is installed, the number of measurement nodes Nm is “10”.
  • Relay nodes 2-3 to 2-4, 2-6 to 2-8, 2-10 to 2-12, 2-14 to 2-16, 2-17 to 2-19, 2-20 to 2-22, 2-24 to 2-25 and 2-29 to 2-30 are grouped into node groups NG1 to NG8, respectively. Therefore, the node group number Ng is “8”. In this case, the value of Nm / Ng is “1.2”, and processing for rounding up to “2” is performed by the CEIL function. Therefore, the buffering upper limit Nu is set to “2”.
  • each group of relay nodes buffers the data measured by the measurement node.
  • each group of relay nodes and the measurement node have a parent-child relationship, and data transmission is performed from the measurement node that is the child node group to the current node in the group of relay nodes that is the parent node group.
  • data measured by the measurement nodes 2-1 and 2-2 is transmitted to the node group NG1 in the operation period (from the measurement nodes 2-1 and 2-2 in FIG. 6 to the relay node 2-4). See arrow heading).
  • the current node corresponds to the relay node 2-4 that has shifted to the intermittent operation period.
  • the number of data buffered in the current node (relay node 2-4) of the node group NG1 is not the buffering upper limit value.
  • the data transmitted to the node group NG1 is buffered at the current node (relay node 2-4) of the node group NG1.
  • data measured by the measurement nodes 2-5 and 2-9 is transmitted to the node group NG2 in the operation period (from the measurement nodes 2-5 and 2-9 in FIG. 6 to the relay node 2-7). See arrow heading).
  • the current node corresponds to the relay node 2-7 that has shifted to the intermittent operation period.
  • the number of data buffered in the current node (relay node 2-7) of the node group NG2 is not the buffering upper limit value.
  • the data transmitted to the node group NG2 is buffered by the current node (relay node 2-7) of the node group NG2.
  • data measured by the measurement node 2-13 is transmitted to the node group NG4 in the operation period (see the arrow from the measurement node 2-13 to the relay node 2-14 in FIG. 6).
  • the current node corresponds to the relay node 2-14 that has transitioned to the intermittent operation period.
  • the number of data buffered in the current node (relay node 2-14) of the node group NG4 is not the buffering upper limit value.
  • the data transmitted to the node group NG4 is buffered at the current node (relay node 2-14) of the node group NG4.
  • the data measured by the measurement node 2-23 is transmitted to the node group NG6 in the operation period (see the arrow from the measurement node 2-23 to the relay node 2-20 in FIG. 6).
  • the current node corresponds to the relay node 2-20 that has shifted to the intermittent operation period.
  • the number of data buffered by the current node (relay node 2-20) of the node group NG6 is not the buffering upper limit value.
  • the data transmitted to the node group NG6 is buffered at the current node (relay node 2-20) of the node group NG6.
  • data measured by the measurement node 2-31 is transmitted to the node group NG8 in the operation period (see the arrow from the measurement node 2-31 to the relay node 2-30 in FIG. 6).
  • the assigned node corresponds to the relay node 2-30 that has shifted to the intermittent operation period.
  • the number of data buffered in the current node (relay node 2-30) of the node group NG8 is not the buffering upper limit value.
  • the data transmitted to the node group NG8 is buffered at the current node (relay node 2-30) of the node group NG8.
  • Each group of relay nodes and the measurement node are in a parent-child relationship, but if the number of data buffered in the current node of each group exceeds the buffering upper limit “2”, the child node group to the parent node Data transfer is performed to the group.
  • data measured by the measurement nodes 2-26 and 2-27 is transmitted to the node group NG7 in the operation period (from the measurement nodes 2-26 and 2-27 in FIG. 6 to the relay node 2-25). See arrow heading).
  • the current node corresponds to the relay node 2-25 that has shifted to the intermittent operation period.
  • the data transmitted to the node group NG7 is buffered by the current node (relay node 2-25) of the node group NG7.
  • the number “2” of data buffered in the current node (relay node 2-25) of the node group NG7 is the buffering upper limit value. For this reason, the current node (relay node 2-25) of the node group NG7 cannot buffer the data measured by the measurement node 2-28.
  • the data measured by the measurement node 2-28 is transmitted to the node group NG7 in the operation period (see the arrow from the measurement node 2-28 to the relay node 2-25 in FIG. 6). . Thereafter, the data transmitted to the node group NG7 is transferred from the assigned node (relay node 2-25) of the node group NG7 to the node group NG5 (from the relay node 2-25 in FIG. 6 to the relay node 2-19). See arrow heading).
  • the current node corresponds to the relay node 2-19 that has shifted to the intermittent operation period.
  • the data transferred to the node group NG5 is buffered at the current node (relay node 2-19) of the node group NG5.
  • the above-described buffering upper limit setting process is performed between the group setting process and the operation process described later.
  • the information processing device 5 (aggregator 4, GW3) arranged the data measured by the measurement nodes in groups so that the number of data to be buffered between the groups becomes as uniform as possible in the operation process described later. Collect by buffering at the relay node.
  • details of processing operations of the information processing apparatus 5 and each node in the buffering upper limit setting process will be described later.
  • FIG. 7 is an explanatory diagram illustrating an example of operation processing (data collection) in the wireless communication system 1 according to the first embodiment.
  • Each group of relay nodes (node groups NG1 to NG8) has a parent-child relationship. Therefore, when the information processing apparatus 5 (aggregator 4, GW3) recovers from the sleep state (when the intermittent operation has shifted from the stop period to the operation period), the parent node group is directed to the child node group in the operation period.
  • the data request is transmitted using multi-hop communication.
  • the data request transmitted from the information processing apparatus 5 is transmitted to the node group NG4 in the operation period (see the dashed line arrow from the aggregator 4 to the relay node 2-14 in FIG. 7). Then, the data request transmitted to the node group NG4 is transmitted to the node groups NG3 and NG6 (refer to the dashed-dotted arrow from the relay node 2-14 to the relay nodes 2-10 and 2-20 in FIG. 7). ).
  • the data request transmitted to the node group NG3 is transmitted to the node groups NG1 and NG2 (indicated by the one-dot chain line arrow from the relay node 2-10 to the relay nodes 2-4 and 2-7 in FIG. reference).
  • the data request transmitted to the node group NG6 is transmitted to the node groups NG5 and NG8 (refer to the dashed-dotted arrow from the relay node 2-20 to the relay nodes 2-19 and 2-30 in FIG. 7). ). Then, the data request transmitted to the node group NG5 is transmitted to the node group NG7 (see the dashed line arrow from the relay node 2-19 to the relay node 2-25 in FIG. 7).
  • each group of relay nodes (node groups NG1 to NG8) has a parent-child relationship. Therefore, when the data node receives the data request, the assigned node in each group transmits the buffered data from the child node group to the parent node group using multi-hop communication.
  • data buffered in the current node of the node group NG1 is transmitted to the node group NG3 in response to the data request (a solid line arrow from the relay node 2-4 to the relay node 2-10 in FIG. 7). See).
  • the data transmitted to the node group NG3 is transmitted to the information processing device 5 via the node group NG4 (from the relay node 2-10 in FIG. 7 to the aggregator 4 via the relay node 2-14). (See solid arrow heading to).
  • data buffered in the current node of the node group NG2 is transmitted to the node group NG3 in response to the data request (a solid line arrow from the relay node 2-7 to the relay node 2-10 in FIG. 7). See).
  • the data transmitted to the node group NG3 is transmitted to the information processing device 5 via the node group NG4 (from the relay node 2-10 in FIG. 7 to the aggregator 4 via the relay node 2-14). (See solid arrow heading to).
  • the data buffered in the current node of the node group NG3 is transmitted to the node group NG4 in response to the data request (the solid line arrow from the relay node 2-10 to the relay node 2-14 in FIG. 7). See).
  • the data transmitted to the node group NG4 is transmitted to the information processing apparatus 5 (see the solid line arrow from the relay node 2-14 to the aggregator 4 in FIG. 7).
  • the data buffered at the current node of the node group NG4 is transmitted to the information processing apparatus 5 in response to the data request (see the solid line arrow from the relay node 2-14 to the aggregator 4 in FIG. 7). ).
  • the data buffered in the current node of the node group NG5 is transmitted to the node group NG6 in response to the data request (the solid line arrow from the relay node 2-19 to the relay node 2-20 in FIG. 7). See).
  • the data transmitted to the node group NG6 is transmitted to the information processing apparatus 5 via the node group NG4 (the aggregator 4 from the relay node 2-20 in FIG. 7 via the relay node 2-14). (See solid arrow heading to).
  • the data buffered in the current node of the node group NG6 is transmitted to the node group NG4 in response to the data request (the solid line arrow from the relay node 2-20 to the relay node 2-14 in FIG. 7). See).
  • the data transmitted to the node group NG4 is transmitted to the information processing apparatus 5 (see the solid line arrow from the relay node 2-14 to the aggregator 4 in FIG. 7).
  • data buffered at the current node of the node group NG7 is transmitted to the node group NG5 in response to the data request (a solid line arrow from the relay node 2-25 to the relay node 2-19 in FIG. 7). See).
  • the data transmitted to the node group NG5 is transmitted to the information processing apparatus 5 via the node groups NG6 and NG4 (from the relay node 2-19 to the relay nodes 2-20 and 2-14 in FIG. 7). (See solid arrow heading to aggregator 4 via).
  • data buffered at the current node of the node group NG8 is transmitted to the node group NG6 in response to the data request (a solid line arrow from the relay node 2-30 to the relay node 2-20 in FIG. 7). See).
  • the data transmitted to the node group NG6 is transmitted to the information processing apparatus 5 via the node group NG4 (the aggregator 4 from the relay node 2-20 in FIG. 7 via the relay node 2-14). (See solid arrow heading to).
  • FIG. 8 is an explanatory diagram of an example of operation processing (role change) in the wireless communication system 1 according to the first embodiment.
  • the turn node and the non-turn node are performing intermittent operations with different cycles.
  • the turn node is assigned to the turn node with respect to one non-turn node in the same group when its battery remaining amount (remaining power amount) is equal to or less than the threshold value.
  • Send a turn signal to set For example, the on-duty node periodically receives information on the remaining battery level from two non-on-duty nodes in the same group, and the remaining battery level of one of the non-on-duty nodes is a constant value.
  • a turn signal is transmitted to the one non-turn node.
  • the turn node passes the data to the one non-turn node (next turn node).
  • the remaining battery level of the relay node 2-4 that is the duty node is equal to or less than the threshold value.
  • the relay node 2-4 receives the information about the remaining battery level from the relay node 2-3 in the node group NG1, and if the remaining battery level of the relay node 2-3 is greater than or equal to a certain value, The node 2-4 selects the relay node 2-3 and transmits the turn signal to the relay node 2-3 (see the arrow from the relay node 2-4 to the relay node 2-3 in FIG. 8). At this time, when the data is buffered, the relay node 2-4 transmits the data to the relay node 2-3.
  • the relay node 2-4 transmits the turn signal, it changes its role (setting) to a non-turn node.
  • the relay node 2-3 changes its role (setting) to the turn node, and buffers the data transmitted from the relay node 2-4.
  • the remaining battery level of the relay node 2-7 that is the duty node is equal to or less than the threshold value.
  • the relay node 2-7 receives the remaining battery information from the relay nodes 2-6 and 2-8 in the node group NG2, the relay node 2-6 and 2-8 among the relay nodes 2-6 and 2-8
  • the relay node 2-7 selects the relay node 2-8 and transmits a turn signal to the relay node 2-8 (relay node 2 in FIG. 8). (See the arrow from -7 to the relay node 2-8).
  • the relay node 2-7 transmits the data to the relay node 2-8. Further, when the relay node 2-7 transmits the turn signal, the relay node 2-7 changes its role (setting) to the non-turn node. The relay node 2-8 changes its role (setting) to the duty node according to the duty signal, and buffers the data transmitted from the relay node 2-7.
  • the remaining battery level of the relay node 2-10 that is the duty node is equal to or less than the threshold value.
  • the relay node 2-10 receives the information on the remaining battery level from the relay nodes 2-11 and 2-12 in the node group NG3, the relay node 2-11 and 2-12 among the relay nodes 2-11 and 2-12
  • the relay node 2-10 selects the relay node 2-12 and transmits a turn signal to the relay node 2-12 (relay node 2 in FIG. 8). (See the arrow from -10 to relay node 2-12).
  • the relay node 2-10 transmits the data to the relay node 2-12. Further, when the relay node 2-10 transmits the turn signal, the relay node 2-10 changes its role (setting) to the non-turn node. The relay node 2-12 changes its role (setting) to the duty node according to the duty signal, and buffers the data transmitted from the relay node 2-10.
  • the remaining battery level of the relay node 2-14 that is the duty node is equal to or less than the threshold value.
  • the relay node 2-14 receives the information on the remaining battery level from the relay nodes 2-15 and 2-16 in the node group NG4, the relay node 2-15 and 2-16 among the relay nodes 2-15 and 2-16
  • the relay node 2-14 selects the relay node 2-16 and transmits a turn signal to the relay node 2-16 (relay node 2 in FIG. 8). (See the arrow from -14 to relay node 2-16).
  • the relay node 2-14 transmits the data to the relay node 2-16. Further, when the relay node 2-14 transmits the turn signal, it changes its role (setting) to a non-turn node. In response to the turn signal, the relay node 2-16 changes its role (setting) to the turn node and buffers the data transmitted from the relay node 2-14.
  • the remaining battery level of the relay node 2-19 that is the duty node is equal to or less than the threshold value.
  • the relay node 2-19 receives information on the remaining battery level from the relay nodes 2-17 and 2-18 in the node group NG5
  • the relay node 2-17 and 2-18 is the relay node.
  • the relay node 2-19 selects the relay node 2-18 and transmits a turn signal to the relay node 2-18 (relay node 2 in FIG. 8). (See arrow pointing from ⁇ 19 to relay node 2-18).
  • the relay node 2-19 transmits the data to the relay node 2-18. Further, when the relay node 2-19 transmits a turn signal, it changes its role (setting) to a non-turn node. In response to the turn signal, the relay node 2-18 changes its role (setting) to the turn node, and buffers the data transmitted from the relay node 2-19.
  • the remaining battery level of the relay node 2-20 that is the duty node is equal to or less than the threshold value.
  • the relay node 2-20 receives the information on the remaining battery level from the relay nodes 2-21 and 2-22 in the node group NG6, the relay node 2-21 and 2-22 among the relay nodes 2-21 and 2-22
  • the relay node 2-20 selects the relay node 2-22 and transmits a turn signal to the relay node 2-22 (relay node 2 in FIG. 8). (See the arrow from -20 to relay node 2-22).
  • the relay node 2-20 transmits the data to the relay node 2-22. Further, when the relay node 2-20 transmits the turn signal, the relay node 2-20 changes its role (setting) to the non-turn node. In response to the turn signal, the relay node 2-22 changes its role (setting) to the turn node, and buffers the data transmitted from the relay node 2-20.
  • the remaining battery level of the relay node 2-25 that is the duty node is equal to or less than the threshold value.
  • the relay node 2-25 receives the information about the remaining battery level from the relay node 2-24 in the node group NG7.
  • the node 2-25 selects the relay node 2-24 and transmits the turn signal to the relay node 2-24 (see the arrow from the relay node 2-25 to the relay node 2-24 in FIG. 8).
  • the relay node 2-25 transmits the data to the relay node 2-24.
  • the relay node 2-25 transmits the turn signal
  • the relay node 2-25 changes its role (setting) to the non-turn node.
  • the relay node 2-24 changes its role (setting) to the turn node, and buffers the data transmitted from the relay node 2-25.
  • the remaining battery level of the relay node 2-30 that is the duty node is equal to or less than the threshold value.
  • the relay node 2-30 receives the information about the remaining battery level from the relay node 2-29 in the node group NG8, and if the remaining battery level of the relay node 2-29 is greater than or equal to a certain value, The node 2-30 selects the relay node 2-29 and transmits the turn signal to the relay node 2-29 (see the arrow from the relay node 2-30 to the relay node 2-29 in FIG. 8). At this time, if the relay node 2-30 is buffering data, the relay node 2-30 transmits the data to the relay node 2-29.
  • the relay node 2-30 transmits the turn signal, it changes its role (setting) to a non-turn node.
  • the relay node 2-29 changes its role (setting) to the turn node, and buffers the data transmitted from the relay node 2-30.
  • FIG. 9 is a timing chart illustrating an example of operation processing (data collection and role change) in the wireless communication system 1 according to the first embodiment.
  • the duty node in the group of relay nodes 2A to 2C relays the data measured by the measurement node 2D, and the information processing device 5 (aggregator 4, GW3) collects the relayed data.
  • relay nodes 2A to 2C are relay nodes 2-14 to 2-16 shown in FIGS. 5 to 8, and measurement node 2D is a measurement node 2-13 shown in FIGS. It shall be.
  • the same group ID is assigned to the relay nodes 2A to 2C as the node group NG.
  • the current node of the node group NG is the relay node 2A, and the intermittent operation of the relay node 2A shifts from the stop period to the operation period.
  • the intermittent operation of the measurement node 2-D shifts from the stop period to the operation period, and the measurement node 2-D measures the state of the measurement target in the operation period and transmits it as data to the node group NG.
  • the relay node 2A that is the duty node of the node group NG buffers the data transmitted from the measurement node 2-D in the operation period.
  • the intermittent operation of the information processing apparatus 5 shifts from the stop section to the operation section.
  • the information processing apparatus 5 transmits a data request to the node group NG in the operation section.
  • the relay node 2A which is the turn node of the node group NG, transmits the buffered data to the information processing apparatus 5 in response to the data request in the operation period.
  • the remaining battery level (remaining power amount) of the relay node 2A that is the duty node of the node group NG is equal to or less than the threshold value.
  • the relay node 2A receives information on the remaining battery level from the relay nodes 2B and 2C in the node group NG, the relay node whose remaining battery level is greater than or equal to a certain value among the relay nodes 2B and 2C. 2B is selected, the turn signal is transmitted to the relay node 2B, and its role (setting) is changed to a non-turn node.
  • the relay node 2B changes its role (setting) to the duty node according to the duty signal.
  • the information processing apparatus 5 (aggregator 4) enters the sleep state, and the intermittent operation of the information processing apparatus 5 shifts from the operation section to the stop section. Further, the intermittent operation of the measurement node 2-D shifts from the operation section to the stop section.
  • the remaining battery level of the relay node 2B which is the turn node of the node group NG, is less than or equal to the threshold value.
  • the relay node 2B receives information on the remaining battery level from the relay nodes 2A and 2C in the node group NG, the relay node whose remaining battery level is greater than or equal to a certain value among the relay nodes 2A and 2C. 2C is selected, a turn signal is transmitted to the relay node 2C, and its role (setting) is changed to a non-turn node.
  • the relay node 2C changes its role (setting) to the turn node in response to the turn signal.
  • the intermittent operation of the measurement node 2-D shifts from the stop section to the operation section, and the measurement node 2-D measures the state of the measurement target in the operation section and transmits it as data to the node group NG.
  • the relay node 2C that is the duty node of the node group NG buffers the data transmitted from the measurement node 2-D in the operation period.
  • the remaining battery level of the relay node 2C which is the turn node of the node group NG, is equal to or less than the threshold value.
  • the relay node 2C receives information on the remaining battery level from the relay nodes 2A and 2B in the node group NG, the relay node whose remaining battery level is greater than or equal to a certain value among the relay nodes 2A and 2B. 2A is selected, the turn signal and buffered data are transmitted to the relay node 2A, and its own role (setting) is changed to a non-turn node.
  • the relay node 2A changes its role (setting) to the duty node in accordance with the duty signal, and buffers data transmitted from the relay node 2C.
  • the intermittent operation of the measurement node 2-D shifts from the operation section to the stop section.
  • the remaining battery level of the relay node 2A that is the duty node of the node group NG is less than or equal to the threshold value.
  • the relay node 2A receives information on the remaining battery level from the relay nodes 2B and 2C in the node group NG, the relay node whose remaining battery level is greater than or equal to a certain value among the relay nodes 2B and 2C. 2B is selected, the turn signal and buffered data are transmitted to the relay node 2B, and its own role (setting) is changed to a non-turn node.
  • the relay node 2B changes its role (setting) to the duty node according to the duty signal, and buffers the data transmitted from the relay node 2A.
  • the intermittent operation of the information processing apparatus 5 shifts from the stop section to the operation section.
  • the information processing apparatus 5 transmits a data request to the node group NG in the operation section.
  • the relay node 2A which is the turn node of the node group NG, transmits the buffered data to the information processing apparatus 5 in response to the data request in the operation period.
  • the remaining battery level of the relay node 2A that is the duty node of the node group NG is equal to or less than the threshold value.
  • the relay node 2A receives information on the remaining battery level from the relay nodes 2B and 2C in the node group NG, the relay node whose remaining battery level is greater than or equal to a certain value among the relay nodes 2B and 2C. 2B is selected, the turn signal is transmitted to the relay node 2B, and its role (setting) is changed to a non-turn node.
  • the relay node 2B changes its role (setting) to the duty node according to the duty signal.
  • the information processing apparatus 5 enters the sleep state, and the intermittent operation of the information processing apparatus 5 shifts from the operation section to the stop section.
  • the intermittent operation of the measurement node 2D shifts from the stop period to the operation period, and the measurement node 2D measures the state of the measurement target in the operation period and transmits it as data to the node group NG.
  • the relay node 2B that is the duty node of the node group NG buffers the data transmitted from the measurement node 2D in the operation period.
  • FIG. 10 is an explanatory diagram illustrating the effect of the operation processing in the wireless communication system 1 according to the first embodiment.
  • the horizontal axis indicates the cycle, and the vertical axis indicates the power of the information processing device 5 (aggregator 4, GW3).
  • the power when the information processing apparatus 5 is operating is 5.3 Wh, and the power when the information processing apparatus 5 is stopped is 0 Wh.
  • the power consumption of the information processing device 5 is always 5.3 Wh (see the dotted line in FIG. 10).
  • the information processing device 5 performs an intermittent operation with one cycle of operation time (operation interval) as 1 minute, the power consumption of the information processing device 5 decreases as the cycle of the stop interval increases (in FIG. 10). See solid line).
  • the information processing apparatus 5 consumes power compared to the relay nodes 2A to 2C shown in FIG. Therefore, in the wireless communication system 1 according to the first embodiment, the information processing apparatus 5 can reduce power consumption by setting the stop period longer than the operation period (data collection period). Further, as described above, the relay nodes 2A to 2C change the role of the duty node in the node group NG. Therefore, in the wireless communication system 1 according to the first embodiment, even if the stop period of the information processing apparatus 5 is set to be long, the timing of the operation period (data collection period) of the information processing apparatus 5 is the same as that of the relay nodes 2A to 2C. What is necessary is just to match
  • FIG. 11 is a flowchart illustrating an example of the operation of the wireless communication system 1 according to the first embodiment.
  • step S1 a network construction process
  • step S2 group setting processing
  • step S3 buffering upper limit setting processing
  • step S4 operation processing
  • FIG. 12 is a flowchart illustrating an example of group setting processing executed by the information processing apparatus 5 as the operation of the wireless communication system 1 according to the first embodiment.
  • the information processing apparatus 5 transmits an LQI request to the relay node (step S201) and collects LQI information from the relay node (step S202).
  • the LQI information transmitted from the relay node includes LQI and position information indicating the installed position.
  • the information processing apparatus 5 groups relay nodes (hereinafter, referred to as relay nodes 2A to 2C) that are present at a distance close to each other and have an LQI that is a certain value or more from each other (step S203).
  • the information processing device 5 notifies each node 2 of the group ID.
  • the group ID notified to each node 2 includes an ID for identifying the own node group, a parent node group of the own node group, and a child node group of the own node group (step S204). Then, the information processing apparatus 5 transmits a turn signal for setting the turn node to each node group NG of the relay nodes 2A to 2C (step S205).
  • FIG. 13 is a flowchart illustrating an example of group setting processing executed by the relay nodes 2A to 2C as the operation of the wireless communication system 1 according to the first embodiment.
  • the relay nodes 2A to 2C wait for an LQI request transmitted from the information processing apparatus 5 (step S211; No).
  • the relay nodes 2A to 2C receive the LQI request transmitted from the information processing apparatus 5 (step S211; Yes)
  • the relay nodes 2A to 2C transmit LQI information to the information processing apparatus 5 (step S212).
  • the relay nodes 2A to 2C wait for the group ID transmitted from the information processing apparatus 5 (step S213; No).
  • the relay nodes 2A to 2C receive the group ID transmitted from the information processing device 5 (step S213; Yes)
  • the group ID is stored in the group ID table 261 of the storage unit 260 (step S214).
  • the relay node 2A among the relay nodes 2A to 2C receives the turn signal transmitted from the information processing apparatus 5 (step S215; Yes).
  • the relay node 2A stores the turn signal in the storage unit 260 and recognizes that its role (setting) is the turn node (step S216).
  • the relay nodes 2B and 2C among the relay nodes 2A to 2C do not receive the turn signal from the information processing apparatus 5 (step S215; No).
  • the relay nodes 2B and 2C recognize that their role (setting) is a non-assigned node.
  • FIG. 14 is a flowchart illustrating an example of the group setting process executed by the measurement node 2D as the operation of the wireless communication system 1 according to the first embodiment.
  • the measurement node 2D waits for the group ID transmitted from the information processing device 5 (step S221; No).
  • the measurement node 2D receives the group ID transmitted from the information processing device 5 (step S221; Yes)
  • the measurement node 2D stores the group ID in the group ID table 261 of the storage unit 260 (step S222).
  • FIG. 15 is a flowchart illustrating an example of the buffering upper limit setting process executed by the information processing apparatus 5 as the operation of the wireless communication system 1 according to the first embodiment.
  • the information processing device 5 calculates the buffering upper limit Nu based on the number of relay nodes (number of node groups) Ng and the number of measurement nodes Nm (step S301).
  • the information processing apparatus 5 transmits the buffering upper limit value Nu to each node group NG of the relay nodes 2A to 2C (step S302).
  • FIG. 16 is a flowchart illustrating an example of the buffering upper limit setting process executed by the relay nodes 2A to 2C as the operation of the wireless communication system 1 according to the first embodiment.
  • the relay nodes 2A to 2C wait for the buffering upper limit Nu transmitted from the information processing apparatus 5 (step S311; No).
  • the buffering upper limit Nu is stored in the storage unit 260 (step S312). .
  • FIG. 17 is a flowchart illustrating an example of operation processing executed by the information processing apparatus 5 as the operation of the wireless communication system 1 according to the first embodiment.
  • the intermittent operation of the information processing device 5 is a stop section. That is, the intermittent operation of the information processing apparatus 5 is not a collection cycle (step S401; No).
  • the intermittent operation of the information processing apparatus 5 shifts from the stop section to the operation section. That is, the intermittent operation of the information processing apparatus 5 is a collection cycle (step S401; Yes). In this case, the information processing apparatus 5 transmits a data request to the node group NG (step S402).
  • the information processing apparatus 5 waits for data transmitted from each node group NG (step S403; No). Here, the information processing apparatus 5 receives data transmitted from each node group NG (step S403; Yes).
  • the information processing apparatus 5 determines whether there is a stop command instruction by the user, for example (step S404).
  • the information processing apparatus 5 enters the sleep state when the stop instruction is not given by the user (step S404; No) and the sleep state time is reached (step S405). That is, the intermittent operation of the information processing apparatus 5 shifts from the operation section to the stop section.
  • the information processing apparatus 5 transmits a stop command to each node 2 and ends the operation process (step S406).
  • FIG. 18 is a flowchart illustrating an example of operation processing executed by the duty node among the relay nodes 2A to 2C as the operation of the wireless communication system 1 according to the first embodiment.
  • step S411; Yes When receiving the data request transmitted from the information processing device 5 (step S411; Yes), the relay node 2A that is the duty node transmits the data when buffering the data (step S412; Yes). (Step S413). On the other hand, when the relay node 2A receives a data request transmitted from the information processing device 5 (step S411; Yes), step S413 is not executed when data is not buffered (step S412; No).
  • the relay node 2A that is the duty node receives the data transmitted from the measurement node 2D (step S414; Yes).
  • the relay node 2A does not receive the data request transmitted from the information processing device 5 (step S411; No), and receives the data transmitted from the measurement node 2D (step S414; Yes).
  • the relay node 2A determines whether or not the number of buffered data is the buffering upper limit value (step S415).
  • the relay node 2A buffers the data transmitted from the measurement node 2D (step S416).
  • the relay node 2A transfers the data to the parent node group NG (step S417).
  • the relay node 2A that is the duty node receives the information on the remaining battery level (remaining power amount) transmitted from the relay nodes 2B and 2C that are the non-number nodes (step S418; Yes).
  • the relay node 2A does not receive the data transmitted from the measurement node 2D (step S414; No), but receives the information on the remaining battery level transmitted from the relay nodes 2B and 2C (step S418; Yes).
  • the remaining battery level of the own node is less than or equal to the threshold (step S419; Yes), and the remaining battery level from the relay nodes 2B and 2C is greater than or equal to a certain value (step S420; Yes).
  • the relay node 2A transmits the turn signal to one of the relay nodes 2B and 2C (for example, the relay node 2B) (step S421). At this time, if the relay node 2A is buffering data, the relay node 2A transmits the data to the relay node 2B. Further, when the relay node 2A transmits the turn signal, the relay node 2A deletes the turn signal from the storage unit 260 and recognizes that its role (setting) is the turn node. That is, the relay node 2A changes its role (setting) to a non-assigned node (step S422).
  • step S419 if the remaining battery level of the relay node 2A, which is the duty node, is not less than or equal to the threshold value (step S419; No), steps S420 to S422 are not executed. If the remaining battery level from the relay nodes 2B and 2C is not equal to or greater than a certain value (step S420; No), steps S421 to S422 are not executed.
  • the relay node 2A When the relay node 2A receives the stop command transmitted from the information processing device 5 (step S423; Yes), the relay node 2A ends the operation process. Alternatively, the relay node 2A does not receive the battery remaining amount information transmitted from the relay nodes 2B and 2C (step S418; No) and receives the stop command transmitted from the information processing device 5 (step S423; Yes), a stop command is transmitted to the relay nodes 2B and 2C in the node group NG and the child node group NG (step S426), and the operation process is terminated.
  • step S411 is executed.
  • the relay node 2A is not a duty node itself (step S424; No), and becomes a sleep state time. In this case, the relay node 2A enters the sleep state and executes the operation process of the non-assigned node (step S425).
  • FIG. 19 is a flowchart illustrating an example of an operation process executed by a non-assigned node among the relay nodes 2A to 2C as the operation of the wireless communication system 1 according to the first embodiment.
  • the intermittent operation of the relay nodes 2B and 2C is a stop period. That is, the intermittent operation of the relay nodes 2B and 2C is not an activation cycle (step S431; No).
  • the intermittent operation of the relay nodes 2B and 2C shifts from the stop section to the operation section. That is, the intermittent operation of the relay nodes 2B and 2C is a start cycle (step S431; Yes).
  • the relay nodes 2B and 2C transmit information on the remaining battery level to the relay node 2A that is the duty node (step S432).
  • the relay node 2C that is a non-assignment node does not receive the stop command transmitted from the information processing apparatus 5 (step S433; No), and does not receive a turn signal from the relay node 2A that is the assignment node (step S434; No). ),
  • the relay node 2C is in the sleep state time. In this case, the relay node 2C enters a sleep state (step S435), and step S431 is executed.
  • the relay node 2C that is a non-assignment node does not receive the stop command transmitted from the information processing device 5 (step S433; No), but receives a turn signal from the relay node 2A that is the assignment node (step S434; Yes).
  • the relay node 2B stores the turn signal in the storage unit 260 and recognizes that its role (setting) is the turn node (step S436). In this case, the relay node 2B executes the operation process of the duty node.
  • FIG. 20 is a flowchart illustrating an example of an operation process executed by the measurement node 2D as the operation of the wireless communication system 1 according to the first embodiment.
  • the intermittent operation of the measurement node 2D is a stop period. That is, the intermittent operation of the measurement node 2D is not a measurement cycle (step S441; No).
  • the intermittent operation of the measurement node 2D shifts from the stop section to the operation section. That is, the intermittent operation of the measurement node 2D becomes a measurement cycle (step S441; Yes).
  • the measurement node 2D measures the state of the measurement target and transmits it as data to the node group NG (step S442).
  • the measurement node 2D When the measurement node 2D receives the stop command transmitted from the information processing apparatus 5 (step S443; Yes), the measurement node 2D ends the operation process.
  • the measurement node 2D does not receive the stop command transmitted from the information processing device 5 (step S443; No), and enters the sleep state time. In this case, the measurement node 2D enters the sleep state (step S444), and step S441 is executed.
  • the wireless communication system 1 includes the information processing device 5 and the node 2.
  • the node 2 performs an intermittent operation that periodically repeats the operation interval and the sleep interval.
  • the information processing apparatus 5 collects data from the node 2.
  • the group setting unit 501 of the information processing device 5 sets the same node group NG for the nodes 2 (relay nodes 2A to 2C) whose mutual communication quality is a certain value or more.
  • the operation control unit 203 of the relay node 2A receives data or requests from the information processing device 5 when the own node (relay node 2A) is set as the duty node that is the operation section in the node group NG. In response to this, data is transmitted to the information processing apparatus 5.
  • the operation control unit 503 of the information processing device 5 collects data from the relay node 2A set as the duty node among the plurality of relay nodes 2A to 2C in the node group NG.
  • the group setting unit 501 of the information processing device 5 transmits a turn signal for setting a turn node to the one relay node 2A in the node group NG.
  • the group setting unit 201 of the relay node 2A sets its own node (relay node 2A) as the turn node.
  • the group setting unit 201 of the relay nodes 2B and 2C sets its own node (relay nodes 2B and 2C) as a non-assignment node when it does not receive the turn signal.
  • the remaining power amount of the own node (relay node 2A) is equal to or less than the threshold value. It is. Further, the remaining power amount notified from the relay nodes 2B and 2C other than the own node (relay node 2A) in the node group NG is equal to or greater than a certain value. In this case, the operation control unit 203 of the relay node 2A transmits a turn signal to one relay node 2B other than the own node (relay node 2A) in the node group NG, and sets the own node (relay node 2A). Change from the duty node to the non-duty node.
  • the operation control unit 203 of the relay node 2B determines that the node group NG is set when the own node (relay node 2B) is set as a non-assigned node in the node group NG.
  • the turn signal is received from the relay node (relay node 2A) which is the turn node in the.
  • the operation control unit 203 of the relay node 2B changes the setting of the own node (relay node 2B) from the non-assigned node to the assigned node.
  • the upper limit setting unit 502 of the information processing apparatus 5 notifies each node group NG of the upper limit value of buffering. Specifically, the upper limit setting unit 502 of the information processing device 5 performs the buffering upper limit based on the number of node groups NG (node group number Ng) and the number of measurement nodes 2D that measure data (measurement node number Nm). The value Nu is calculated. Then, the upper limit setting unit 502 of the information processing device 5 notifies each node group NG of the buffering upper limit value Nu. The upper limit setting unit 202 of the relay nodes 2A to 2C in the node group NG sets the buffering upper limit value Nu transmitted from the information processing apparatus 5.
  • the operation control unit 203 of the relay node 2A receives the data measured by the measurement node 2D and buffers the received data when the own node is set as the duty node in the node group NG.
  • the operation control unit 203 of the relay node 2A transfers data transmitted from the child group to the parent node group NG.
  • the power consumption is reduced by shifting to the sleep period (stop period), which is the low power consumption, except for the operation period (data collection period). be able to.
  • the information processing apparatus 5 can reduce power consumption by setting the stop period longer than the operation period (data collection period).
  • the relay nodes 2A to 2C change the role of the duty node in the node group NG. Therefore, in the wireless communication system 1 according to the first embodiment, even if the stop period of the information processing apparatus 5 is set to be long, the timing of the operation period (data collection period) of the information processing apparatus 5 is the same as that of the relay nodes 2A to 2C. What is necessary is just to match
  • the wireless communication system 1 according to the first embodiment, it is possible to avoid data collection problems while achieving low power consumption.
  • the operation process when the remaining battery level of the current node among the relay nodes 2A to 2C is equal to or less than the threshold value, the current node is changed to another relay node. It is not limited to.
  • the turn nodes of the relay nodes 2A to 2C may be ordered.
  • the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
  • FIG. 21 is a flowchart illustrating an example of group setting processing executed by the information processing apparatus 5 as the operation of the wireless communication system 1 according to the second embodiment.
  • the information processing apparatus 5 executes steps S201 to S205 as in the first embodiment (see FIG. 12). Then, the information processing apparatus 5 transmits the node list of the same node group NG to the turn node of each node group NG (step S1200).
  • the node list includes IDs that identify the relay nodes 2A to 2C in the node group NG.
  • IDs include MAC addresses.
  • the MAC address of the relay node 2A is the largest, and the MAC address of the relay node 2C is the smallest.
  • the relay node 2A becomes the first turn node
  • the relay node 2B becomes the second turn node
  • the relay node 2C becomes the third turn node.
  • the node list is transmitted to the relay node 2A that is the first duty node.
  • FIG. 22 is a flowchart illustrating an example of the group setting process executed by the duty node among the relay nodes 2A to 2C as the operation of the wireless communication system 1 according to the second embodiment.
  • the relay node 2A which is the duty node, executes steps S211 to S216 as in the first embodiment (see FIG. 13).
  • the relay node 2A which is the duty node, waits for the node list transmitted from the information processing apparatus 5 (step S1211; No).
  • the relay node 2A receives the node list transmitted from the information processing apparatus 5 (step S1211; Yes)
  • the relay node 2A stores the node list in the storage unit 260, and sets the node list to a non-assigned node of the same node group NG.
  • the list is transmitted (step S1212).
  • the relay node 2A determines the relay node 2B to be the next node after its own node based on the MAC address in the node list stored in the storage unit 260 (step S1213).
  • FIG. 23 is a flowchart illustrating an example of group setting processing executed by a non-assigned node among the relay nodes 2A to 2C as the operation of the wireless communication system 1 according to the second embodiment.
  • the relay nodes 2B and 2C which are non-assigned nodes, execute steps S211 to S215 as in the first embodiment (see FIG. 13).
  • the relay nodes 2B and 2C which are non-assigned nodes wait for the node list transmitted from the information processing apparatus 5 (step S1221; No).
  • the node lists are stored in the storage unit 260.
  • the relay node 2 ⁇ / b> B determines the relay node 2 ⁇ / b> C that will be the next node after its own node based on the MAC address in the node list stored in the storage unit 260.
  • the relay node 2C determines the relay node 2A to be the next node after its own node based on the MAC address in the node list stored in the storage unit 260 (step S1222).
  • FIG. 24 is a flowchart illustrating an example of operation processing executed by the duty node among the relay nodes 2A to 2C as the operation of the wireless communication system 1 according to the second embodiment.
  • the relay node 2A which is the duty node, executes steps S411 to S417 as in the first embodiment (see FIG. 18).
  • the relay node 2A that is the duty node receives the wake-up notification transmitted from the same node group NG (step S1411; Yes).
  • the remaining battery level of the own node is equal to or less than the threshold (step S1412; Yes), and the wake-up notification transmitted from the same node group NG This is a notification (step S1413; Yes).
  • the relay node 2A executes steps S421 to S425 as in the first embodiment (see FIG. 18).
  • steps S1413, S421, and S422 are not executed.
  • the wake-up notification transmitted from the same node group NG is not the wake-up notification from the relay node 2B which is the next node after the own node (step S1412; No). In this case, steps S421 to S422 are not executed.
  • the relay node 2A does not receive the wake-up notification transmitted from the same node group NG (step S1411; No), and receives the stop command transmitted from the information processing device 5 (step S423; Yes), A stop command is transmitted to the relay nodes 2B and 2C in the node group NG and the child node group NG (step S426), and the operation process is terminated.
  • FIG. 25 is a flowchart illustrating an example of operation processing executed by a non-assigned node among the relay nodes 2A to 2C as the operation of the wireless communication system 1 according to the second embodiment.
  • the relay nodes 2B and 2C which are non-assigned nodes, execute step S431 as in the first embodiment (see FIG. 19).
  • the relay nodes 2B and 2C transmit a wake-up notification to the relay node 2A that is the duty node (step S2411).
  • relay nodes 2B and 2C which are non-assigned nodes, execute steps S433 to S437 as in the first embodiment (see FIG. 19).
  • the current node is set in order within the node group NG. Specifically, when the own node (relay node 2A) is set as the duty node in the node group NG, the remaining power amount of the own node (relay node 2A) is equal to or less than the threshold value. Further, the operation control unit 203 of the relay node 2A receives the wake-up notification from the relay nodes 2B and 2C other than the own node (relay node 2A) in the node group NG.
  • the operation control unit 203 of the relay node 2A transmits a turn signal to one relay node 2B other than the own node (relay node 2A) in the node group NG, and sets the own node (relay node 2A). Change from the duty node to the non-duty node.
  • the wireless communication system 1 according to the second embodiment achieves the same effect as the first embodiment even when the turn nodes of the relay nodes 2A to 2C are ordered. That is, according to the wireless communication system 1 according to the second embodiment, it is possible to avoid a data collection problem while reducing power consumption.
  • the communication quality in the first and second embodiments is not limited to LQI, for example, and may be another index.
  • each component in the first and second embodiments does not necessarily need to be physically configured as illustrated.
  • the specific form of distribution / integration of each part is not limited to the one shown in the figure, and all or a part thereof may be functionally or physically distributed / integrated in arbitrary units according to various loads and usage conditions. Can be configured.
  • each device is executed entirely or arbitrarily on a CPU (Central Processing Unit) (or a micro computer such as MPU (Micro Processing Unit) or MCU (Micro Controller Unit)). You may make it do.
  • Various processes may be executed in whole or in any part on a program that is analyzed and executed by a CPU (or a microcomputer such as an MPU or MCU) or hardware based on wired logic.
  • the node 2 and the information processing apparatus 5 in the first and second embodiments can be realized by, for example, the following hardware configuration.
  • FIG. 26 is a diagram illustrating an example of a hardware configuration of the node 2.
  • a node 2 illustrated in FIG. 26 includes a processor 2001, a memory 2002, and an analog circuit 2003.
  • the processor 2001 include a CPU, a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), and the like.
  • the memory 2002 include a RAM (Random Access Memory) such as SDRAM (Synchronous Dynamic Random Access Memory), a ROM (Read Only Memory), a flash memory, and the like.
  • the MCU 200 in FIG. 2 is realized by the processor 2001, and the storage unit 260 in FIG. 2 is realized by the memory 2002.
  • the various processes performed in the node 2 in the first and second embodiments are realized by executing programs stored in various memories such as a nonvolatile storage medium by the processor.
  • a program corresponding to each process executed by the MCU 200 of FIG. 2 is recorded in the memory 2002, and each program is executed by the processor 2001.
  • the sensor element 210, the energy harvesting element 220, the battery 230, the power supply control unit 240, and the radio unit 250 in FIG. 2 are realized by the analog circuit 2003.
  • the various processes performed by the node 2 in the first and second embodiments are executed by one processor 2001, the present invention is not limited to this, and may be executed by a plurality of processors.
  • FIG. 27 is a diagram illustrating an example of a hardware configuration of the information processing apparatus 5.
  • the information processing apparatus 5 illustrated in FIG. 27 includes a processor 5001, a memory 5002, and an analog circuit 5003.
  • Examples of the processor 5001 include a CPU, a DSP, and an FPGA.
  • Examples of the memory 5002 include RAM such as SDRAM, ROM, flash memory, and the like.
  • the processor 5001 is realized by the processor 5001, and the storage unit 560 in FIG. 4 is realized by the memory 5002.
  • various processes performed by the information processing apparatus 5 according to the first and second embodiments are realized by executing programs stored in various memories such as a nonvolatile storage medium using a processor.
  • a program corresponding to each process executed by the MCU 500 in FIG. 4 is recorded in the memory 5002, and each program is executed by the processor 5001.
  • the energy harvesting element 520, the battery 530, the power supply control unit 540, and the communication unit 550 in FIG. 4 are realized by the analog circuit 5003.
  • the various processes performed by the information processing apparatus 5 in the first and second embodiments are executed by one processor 5001, the present invention is not limited to this, and may be executed by a plurality of processors.
  • Wireless communication system 2 2-1 to 2-31 Node 3 GW 4 Aggregator 5
  • Information processing device 200 MCU 201 Group setting unit 202 Upper limit setting unit 203 Operation control unit 204 Control unit 210 Sensor element 220 Energy harvesting element 230 Battery 240 Power supply control unit 250 Wireless unit 260 Storage unit 261 Group ID table 262 LQI table 500 MCU 501 Group setting unit 502 Upper limit setting unit 503 Operation control unit 504 Control unit 520 Energy harvesting element 530 Battery 540 Power supply control unit 550 Communication unit 560 Storage unit

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Abstract

L'invention concerne un dispositif de traitement d'informations (5) qui collecte des données à partir d'un nœud de relais qui effectue des opérations intermittentes dans lesquelles des intervalles de fonctionnement et des intervalles de sommeil sont répétés périodiquement. Le dispositif de traitement d'informations (5) transmet, à des nœuds de relais (2A-2C) entre lesquels une qualité de communication dépassant une certaine valeur est obtenue, un ID de groupe pour régler les nœuds de relais dans le même groupe de nœuds (NG). Le dispositif de traitement d'informations (5) collecte des données mesurées par un nœud de mesure (2D) à partir d'un nœud de relais (2A) qui, parmi les nœuds de relais (2A-2C) dans le groupe de nœuds (NG), est assigné pour être un nœud de service pour un intervalle de fonctionnement.
PCT/JP2018/005672 2018-02-19 2018-02-19 Dispositif de traitement d'informations, nœud, système de communication sans fil et procédé de commande de réseau sans fil Ceased WO2019159348A1 (fr)

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JP2019571932A JP6939917B2 (ja) 2018-02-19 2018-02-19 情報処理装置、ノード、無線通信システムおよび無線網制御方法

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JP2014036273A (ja) * 2012-08-07 2014-02-24 Fujitsu Ltd 通信方法及び情報処理装置
JP2015122712A (ja) * 2013-12-25 2015-07-02 Ｎｅｃプラットフォームズ株式会社 無線通信システムおよびその構築方法
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JP5655192B2 (ja) * 2011-02-24 2015-01-21 株式会社国際電気通信基礎技術研究所 制御装置

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WO2010010708A1 (fr) * 2008-07-24 2010-01-28 パナソニック株式会社 Procédé pour transpondeurs et relais
WO2012111255A1 (fr) * 2011-02-14 2012-08-23 パナソニック株式会社 Procédé de radiomessagerie, système de radiomessagerie, dispositif de communication et nœud correspondant
JP2014036273A (ja) * 2012-08-07 2014-02-24 Fujitsu Ltd 通信方法及び情報処理装置
JP2015122712A (ja) * 2013-12-25 2015-07-02 Ｎｅｃプラットフォームズ株式会社 無線通信システムおよびその構築方法
WO2015118847A1 (fr) * 2014-02-04 2015-08-13 日本電気株式会社 Système de réseau de communication sans fil, et procédé de détermination de dispositif de capteur représentatif
JP2016012916A (ja) * 2014-06-06 2016-01-21 ソニー株式会社 情報処理装置、情報処理方法およびプログラム

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