WO2019008707A1 - Dispositif de commande de réseau sans fil, procédé de commande de réseau sans fil, et système de communication - Google Patents

Dispositif de commande de réseau sans fil, procédé de commande de réseau sans fil, et système de communication Download PDF

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Publication number
WO2019008707A1
WO2019008707A1 PCT/JP2017/024681 JP2017024681W WO2019008707A1 WO 2019008707 A1 WO2019008707 A1 WO 2019008707A1 JP 2017024681 W JP2017024681 W JP 2017024681W WO 2019008707 A1 WO2019008707 A1 WO 2019008707A1
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WIPO (PCT)
Prior art keywords
node
state
wireless
relay
battery
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PCT/JP2017/024681
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English (en)
Japanese (ja)
Inventor
鈴木　貴久
浩一郎 山下
康志 栗原
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富士通株式会社
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Priority to PCT/JP2017/024681 priority Critical patent/WO2019008707A1/fr
Priority to JP2019528266A priority patent/JP6852792B2/ja
Publication of WO2019008707A1 publication Critical patent/WO2019008707A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving 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 a control device for a radio network, a control method for a radio network, and a communication system.
  • a wireless sensor network (WSN) system has been proposed in which a sensor is connected to a wireless communication node operating by environmental power generation such as sunlight and the sensing information is collected by multi-hop communication.
  • the sensing data is aggregated in a gateway (GW) by multi-hop communication, and is accumulated in the server from the GW via the Internet.
  • GW gateway
  • a wireless communication node performing multi-hop communication operates in a relay state in which communication is relayed and in a non-relay state in which communication is not relayed.
  • a wireless communication node in a non-relay state (referred to as a non-relay node) does not perform a relay operation. Whether the wireless communication node operates as a relay node or as a non-relay node is determined by the operation setting of the wireless communication node.
  • the power consumption of the relay node is greater than the power consumption of the non-relay node. For this reason, even when operating under the same conditions, the remaining battery power of the relay node may be exhausted before the remaining battery power of the non-relay node is exhausted. Therefore, there are the following technologies.
  • the server side collects communication quality information (LQI: Link Quality Indicator) between the remaining battery level of each node and the peripheral nodes.
  • the remaining battery capacity of the relay node is predicted, and the relay node is changed to a non-relay node according to an instruction from the server before the remaining battery power is exhausted, and the remaining battery power is recovered by environmental power generation.
  • a non-relay node around the relay node to be changed to a non-relay node is selected on the server side based on LQI, and the network is maintained by instructing the relay node to change (see, for example, Patent Document 1).
  • the wireless communication node may be disconnected from the wireless network and not connected due to deterioration of the wireless communication environment or the like.
  • the wireless communication node in the unconnected state transmits a connection request.
  • the wireless communication node receiving the connection request is in the relay state, the connection with the connection request source is made in response to the connection request, and if it is in the non-relay state, the operation is not performed It is possible to do.
  • the wireless communication node in the unconnected state can not connect to the wireless network.
  • An object of the present invention is to provide a control apparatus for a wireless network, a control method for a wireless network, and a communication system capable of properly performing reconnection of a disconnection node.
  • each wireless node includes an energy harvesting unit and a storage battery, receives and drives power of at least one of the energy harvesting unit and the storage battery, and performs connection processing with a connection request source according to a connection request.
  • a control device of a wireless network including a wireless node group operating in a first state to be performed and a second state in which a battery remaining amount of the storage battery can be recovered by the environmental power generation unit and which does not respond to the connection request, For each of the wireless nodes, a battery remaining value indicating the battery remaining capacity of the storage battery, a communication quality value indicating the communication quality with other wireless nodes in the vicinity, and information indicating the relay status or the non-relay status are stored.
  • a control unit that executes a process of transmitting an instruction to change to the first state to be performed.
  • the disconnection node can be properly reconnected.
  • FIG. 1 shows an example of a wireless sensor network (WSN) system according to an embodiment.
  • FIG. 2 shows a configuration example of a wireless communication node.
  • FIG. 3 shows a configuration example of the GW.
  • FIG. 4 shows an example of the configuration of the server.
  • FIG. 5 shows an example of the data structure of a table T1 storing the remaining battery capacity of each wireless communication node.
  • FIG. 6 shows an example of the data structure of a table T2 storing information indicating the communication quality (LQI) between each wireless communication node and the wireless communication node having the target ID.
  • FIG. 7 shows an example of the data structure of a table T3 storing information indicating the mode (state) of each wireless communication node.
  • FIG. 1 shows an example of a wireless sensor network (WSN) system according to an embodiment.
  • FIG. 2 shows a configuration example of a wireless communication node.
  • FIG. 3 shows a configuration example of the GW.
  • FIG. 4 shows an example of the configuration of the
  • FIG. 8 shows an example of the data structure of a table T4 storing the correspondence between cut nodes and lists of candidate nodes.
  • FIG. 9 shows an example of processing of the server at the normal time.
  • FIG. 10 shows an example of processing of the server at the time of detection of disconnection of a node.
  • FIG. 11 shows an example of processing of the server at the time of connection attempt with a non-relay node.
  • FIG. 12 shows an example of processing of the server at the time of connection attempt with a candidate node.
  • FIG. 13 shows operation 1 of scenario 1 in the specific example.
  • FIG. 14 shows operation 2 of scenario 1 in the specific example.
  • FIG. 15 shows operation 3 of scenario 1 in the specific example.
  • FIG. 16 shows operation 4 of scenario 1 in the specific example.
  • FIG. 17 shows operation 1 of scenario 2 in the specific example.
  • FIG. 18 shows operation 2 of scenario 2 in the specific example.
  • FIG. 19 shows operation 3 of scenario 2 in the specific example.
  • FIG. 20 shows operation 4 of scenario 2 in the specific example.
  • FIG. 21 shows an operation 5 of scenario 2 in the specific example.
  • FIG. 22 shows operation 5 of scenario 2 in the specific example.
  • FIG. 23 shows operation 6 of scenario 2 in the specific example.
  • FIG. 24 shows an operation 4 of scenario 3 in the specific example.
  • FIG. 25 shows operation 5 of scenario 3 in the specific example.
  • FIG. 26 shows an operation 5A of scenario 3 in the specific example.
  • FIG. 27 shows an operation 6 of scenario 3 in the specific example.
  • FIG. 28 shows an operation 7 of scenario 3 in the specific example.
  • FIG. 29 shows an operation 7 of scenario 3 in the specific example.
  • FIG. 1 shows an example of a wireless sensor network (WSN) system (communication system) according to an embodiment.
  • the WSN system includes a plurality of wireless communication nodes (also referred to as sensor nodes: simply described as “nodes”) 1, a gateway (GW) 2, and a server 4 connected via the GW 2 and the network 3.
  • a plurality of nodes 1 form a wireless network with the GW 2 at the top.
  • the node 1 is an example of the “wireless node”, and the plurality of nodes 1 is an example of the “node group”.
  • the node 1 has a sensor 17 (FIG. 2), and data (sensing data) obtained by the sensor 17 is transmitted to the GW 2 by multi-hop communication.
  • the GW 2 aggregates sensing data from the node 1 and sends it to the server 4 via the network 3.
  • the server 4 performs predetermined processing such as accumulation and analysis of sensing data.
  • the network 3 is, for example, a cellular network, an IP (Internet Protocol) network such as the Internet, or a combination of a cellular network and an IP network.
  • IP Internet Protocol
  • the configuration of the network 3 can be set as appropriate.
  • the node 1 is operable in a relay mode (relay state) for relaying communication (data) and a non-relay mode (non-relay state) for not relaying communication (data).
  • Node 1 in the non-relaying state is referred to as "non-relaying node”
  • node 1 in the relaying state is referred to as "relaying node”.
  • the relay state is an example of the “first state”
  • the non-relay state is an example of the “second state”.
  • the node 1 is set to one of the relay state and the non-relay state in the initial state, and is disposed at a predetermined position in the unconnected state.
  • the predetermined position is, for example, a position suitable for obtaining desired sensing data.
  • the unconnected node 1 performs the following initial setting. That is, the unconnected node 1 periodically transmits a search signal by broadcast. When receiving the search signal, the node 1 operating in the relay state transmits a search response to the node 1 that is the transmission source of the search signal. The node 1 that has received the search response transmits a connection request to the node 1 that has transmitted the search response. The node 1 having received the connection request returns a connection response to the node 1 which is the transmission source of the connection request. Thereby, the connection between the nodes 1 is established, and the state “not connected” of the node 1 transitions to the state “connected”.
  • the node 1 accepting the connection becomes a parent node to the node requesting the connection, and the node 1 requesting the connection becomes a child node to the parent node.
  • a parent node can have multiple child nodes.
  • GW2 may be a parent node.
  • the node 1 that has requested connection is a relay node
  • the node 1 (relay node) that has requested this connection will be in a state of accepting the unconnected node 1 in the vicinity thereof.
  • a tree having a top of GW2 as shown in FIG. 1 is constructed in the wireless network.
  • relay and “non-relay” are the operation modes of the node 1 to the last. Therefore, as shown in FIG. 1, even node 1 operating as a relay node may not have a child node.
  • the GW 2 is a communication device that performs near field communication used in the WSN system and relay of the network 3.
  • the GW 2 transmits sensing data sent from the node 1 to the server 4 via the network 3, and sends a control command for the node 1 sent from the server 4 to the node 1.
  • the sensing data and commands from the server 4 are routed along the network on the tree and delivered to the GW 2 or the destination node 1.
  • the short distance wireless communication is, for example, Bluetooth (registered trademark) or ZigBee. However, the communication standard is not limited to these examples.
  • FIG. 2 shows a configuration example of the wireless communication node (node 1).
  • the node 1 includes a power supply unit 1A and a control unit 1B.
  • Power supply unit 1A includes an environmental power generation element 11, a storage battery 12, and a power supply control circuit 13.
  • the environmental power generation element 11 is, for example, a solar cell, but may be one that generates power by photovoltaic power generation other than a solar battery, vibration power generation, or temperature difference power generation.
  • the environmental power generation element 11 is an example of the “environmental power generation unit”.
  • the control unit 1 B includes a central processing unit (CPU) 14, a read only memory (ROM) 15, a random access memory (RAM) 16, a sensor 17, and a wireless circuit 18 connected via a communication line (bus).
  • An antenna 19 is connected to the radio circuit 18.
  • the CPU 14 may be a microcontroller (MCU).
  • the power supply control circuit 13 supplies power to the control unit 1B and stores the surplus power in the storage battery 12 if the energy generating element 11 has a sufficient amount of power generation. When the power is insufficient, the power supply control circuit 13 compensates for the shortage from the storage battery 12 and supplies power to the control unit 1B.
  • the CPU 14 loads the program stored in the ROM 15 into the RAM 16 and executes the program to perform, for example, processing based on a command from the server 4 received from the wireless circuit 18.
  • processing based on a command for example, processing of changing the mode of node 1 from “relay” to “non-relay” or from “non-relay” to “relay” according to a command of mode change instruction I do.
  • the CPU 14 performs measurement of sensing data using the sensor 17, measurement of the remaining battery level of the storage battery 12, measurement of communication quality, and the like.
  • the CPU 21 transmits the result of each measurement via the wireless circuit 18.
  • the CPU 14 can measure the battery remaining amount by acquiring, for example, the terminal voltage of the storage battery 12 from the power supply control circuit 13. Also, the CPU 14 measures communication quality by acquiring from the wireless circuit 18 the radio wave intensity and the like when receiving radio waves transmitted by the peripheral node 1, for example. Therefore, the CPU 14 can measure the communication quality of the node 1 to which radio waves of receivable strength can be received regardless of the parent-child relationship.
  • FIG. 3 is a view showing a configuration example of the GW 2.
  • the GW 2 includes a CPU 21, a main storage device 22, an auxiliary storage device 23, a communication interface (communication IF) 24, and a wireless circuit 25 mutually connected via a communication line (bus).
  • An antenna 26 is connected to the wireless circuit 25.
  • the main storage device 22 is used as a program expansion area, a work area of the CPU 21, a storage area of data and programs, a buffer area of communication data, and the like.
  • the main storage device 22 is formed of, for example, a combination of a random access memory (RAM) and a RAM and a read only memory (ROM).
  • the auxiliary storage device 23 is used as a storage area for data and programs.
  • the auxiliary storage device 23 is formed of, for example, a non-volatile storage medium such as a hard disk drive (HDD), a solid state drive (SSD), a flash memory, and an electrically erasable programmable read-only memory (EEPROM).
  • the main storage device 22 and the auxiliary storage device 23 are examples of the “storage device”, the “storage medium”, the “memory”, and the “storage unit”.
  • the communication IF 24 is connected to the network 3 and used for communication with the server 4.
  • the communication IF 24 is, for example, a network interface card (NIC).
  • the CPU 21 operates as the GW 2 by executing a program stored in at least one of the main storage device 22 and the auxiliary storage device 23.
  • the CPU 21 performs processing for data relay to the server 4, such as protocol conversion for transmitting data and information received from each node 1 to the server 4 (network 3).
  • the CPU 21 performs processing for transmitting data (such as a command) received from the server 4 to the destination node 1.
  • the wireless circuit 25 is used for wireless communication between the GW 2 and each node 1.
  • FIG. 4 shows an exemplary configuration of the server 4.
  • the server 4 includes a CPU 41, a main storage device 42, an auxiliary storage device 43, and a communication IF 44 mutually connected via a communication line (bus).
  • the main storage unit 42, the auxiliary storage unit 43, and the communication IF 44 the same ones as the main storage unit 22, the auxiliary storage unit 23, and the communication IF 24 can be applied.
  • the communication IF 44 receives the data transmitted from the node 1, and the received data is stored in the auxiliary storage device 43.
  • the CPU 41 performs various processing as the server 4 by executing a program stored in at least one of the main storage device 42 and the auxiliary storage device 43.
  • the CPU 41 collects various information including sensing data from each node 1 at predetermined timing (for example, periodically or when an event occurs), and accumulates and processes the information.
  • the CPU 41 of the server 4 performs processing for periodically collecting the remaining battery level measured by each node 1 and the communication quality (LQI) generated based on radio waves received from peripheral nodes.
  • the CPU 41 performs processing for storing the collected information in at least one of the main storage device 42 and the auxiliary storage device 43.
  • the CPU 41 of the server 4 identifies the node 1 in the non-relaying state to be connected to the disconnection node, and transmits the change instruction to the relaying state to the identified node.
  • the above-described CPU 41 is an example of the “control device”, the “control unit”, and the “controller”.
  • the CPU 41 is also called an MPU (Microprocessor) or a processor.
  • the CPU 41 is not limited to a single processor, and may have a multiprocessor configuration. Also, a single CPU connected by a single socket may have a multi-core configuration. At least a part of the processing performed by the CPU 41 may be executed by a multi-core or multiple CPUs. At least a part of the processing performed by the CPU 41 is performed by a processor other than the CPU, for example, a dedicated processor such as a digital signal processor (DSP), a graphics processing unit (GPU), a numerical operation processor, a vector processor, or an image processor. Also good.
  • DSP digital signal processor
  • GPU graphics processing unit
  • numerical operation processor a vector processor
  • vector processor or an image processor. Also good.
  • the processing performed by the CPU 41 may be performed by an integrated circuit (IC) or another digital circuit.
  • the integrated circuit or the digital circuit may include an analog circuit.
  • the integrated circuit includes an LSI, an application specific integrated circuit (ASIC), and a programmable logic device (PLD).
  • the PLD includes a Field-Programmable Gate Array (FPGA).
  • At least part of the processing performed by the CPU 41 may be performed by a combination of a processor and an integrated circuit. The combination is called, for example, a microcontroller (MCU), a SoC (System-on-a-chip), a system LSI, a chipset, or the like.
  • FIG. 5 shows an example of the data structure of a table T1 storing information indicating the remaining battery capacity of each node.
  • FIG. 6 shows an example of the data structure of a table T2 storing information indicating communication quality (LQI) between each node and the node of the target ID.
  • FIG. 7 shows an example of the data structure of a table T3 storing information indicating the mode of each node.
  • the tables T1, T2 and T3 are stored in at least one of the main storage device 42 and the auxiliary storage device 43, and the reading and writing of data with respect to the tables T1, T2 and T3 are performed by the CPU 41. The same applies to a table T4 described later.
  • ID indicates the ID of the node 1 of the data transmission source, that is, the ID (identifier) of the node 1 that has measured the remaining battery level and the communication quality.
  • the “target ID” in FIG. 6 indicates a node 1 that is a transmission source node of radio waves when communication quality is measured.
  • Battery remaining amount in the table T1 is a value indicating the battery remaining amount (an example of the battery remaining amount value).
  • the value of the battery remaining amount may be a terminal voltage or a value obtained by converting the terminal voltage into a percentage.
  • “LQI” of the table T2 indicates a communication quality value (LQI value) obtained from the radio wave received from the node 1 having the target ID.
  • the table T3 stores information indicating whether the current mode of each node 1 is in the relay state or the non-relay state. As information stored in the table T3, when each node 1 is placed at a predetermined position, the initial state (one of “relay” and “non-relay”) of each node 1 is stored. Thereafter, each node 1 is updated each time the mode is switched.
  • the server 4 collects the remaining battery level of each node 1 and communication quality information (LQI) between the peripheral nodes, and predicts the remaining battery level of the relay node.
  • the server 4 transmits an instruction to change to the non-relay state to the relay node where the predicted remaining battery power falls below the predetermined threshold.
  • a relay node becomes a non-relay node by changing the mode to "non-relay".
  • the server 4 selects the node 1 to be changed to the relay state from the non-relay nodes around the node 1 to be changed to the non-relay node based on LQI, and instructs the selected node 1 to change to the relay state. send. This maintains the wireless network.
  • the node 1 connected (disposed) to the wireless network transmits an alive (Alive) signal by broadcast to the surroundings at regular intervals.
  • the node 1 assumes that the connection with the parent node is disconnected in the following cases, and transitions to the unconnected state.
  • (I) When the alive signal from the parent node can not be received for a certain period.
  • (Ii) When the communication quality (LQI) of the radio wave from the parent node becomes equal to or less than a preset communication quality threshold (communication quality threshold).
  • a preset communication quality threshold value a value indicating the minimum communication quality that can be stably communicated is determined in advance.
  • a notification indicating disconnection to all child nodes (disconnected notification before disconnected) Send).
  • the child node that has received the disconnection notification transmits a disconnection notification to the child node that it has, and transitions to the unconnected state.
  • the node 1 in the unconnected state searches for the parent node (GW 2 or connected relay node) of the reconnection destination in the same procedure as the initial setting, and when the connection with the parent node is completed, connection notification is sent to the server 4 Send.
  • GW 2 or connected relay node
  • the node 1 that has shifted to the unconnected state stops transmission of the alive signal.
  • the parent node monitors the alive signal periodically transmitted from the child node.
  • the parent node of the node 1 that has transitioned to the unconnected state detects the disconnection of the child node when the time when no alive signal from the child node is received exceeds the fixed period.
  • the parent node that has detected the disconnection of the child node transmits a disconnection detection notification to the server 4.
  • the server 4 detects the disconnection node which is the node 1 disconnected from the wireless network (parent node) by receiving the disconnection detection notification.
  • the server 4 having received the disconnection detection notification waits for the node 1 (node disconnected from the wireless network) corresponding to the disconnection detection notification and its descendant node 1 to connect to the node 1 other than the parent node for a certain period of time.
  • a period sufficient for the connection attempt is set based on the cycle in which the node 1 in the unconnected state transmits the search signal.
  • the server 4 performs the following processing on the node 1 (disconnected node) that does not transition to the connected state. That is, the server 4 extracts a non-relay node having a remaining battery capacity and communication quality capable of properly communicating with the disconnection node, based on the communication quality and the battery remaining capacity related to the disconnection node recorded in the table T1 and the table T2. Do.
  • the communication quality between the disconnection node and the non-relay node is equal to or higher than the threshold of the communication quality
  • the battery remaining amount of the non-relay node is equal to or higher than the battery remaining amount threshold
  • extract nodes recorded as non-relay nodes as the battery remaining capacity threshold value, a value of the remaining battery capacity sufficient to operate stably as a relay node is used.
  • the server 4 transmits a command to change the mode to “relay” to the extracted non-relay node.
  • the disconnect node becomes connected and transmits a connection notification to the server 4.
  • the server 4 can consider that the disconnection node is connected by receiving the connection notification.
  • the server 4 When all of the disconnected nodes are in the connected state, and after waiting for a sufficient period to make a connection attempt, the server 4 performs the following processing. That is, the server 4 transmits a command for returning, to the non-relay node, the node 1 which is not connected to the disconnection node among the nodes 1 changed to the relay node. Also, the server 4 records the node 1 to which the disconnection node is connected as a relay node in the table T3 and leaves the node 1 as the relay node.
  • the priority may be determined in the order of the remaining amount of remaining battery and in the order of high communication quality, and node 1 extracted according to the priority may be changed to relay nodes one by one to perform connection trial. .
  • the server 4 performs the following processing. That is, a non-relay node whose communication quality with the disconnection node exceeds the communication quality threshold (is in the vicinity of the disconnection node) and the remaining battery amount is less than the remaining battery threshold (less than the predetermined amount) Determine a candidate node for.
  • Information on candidate nodes is stored, for example, in a table T4 shown in FIG.
  • the table T4 stores a list of candidate node IDs corresponding to the disconnected node IDs.
  • the server 4 performs a mode for this node 1 Send a command to change to "relay".
  • the server 4 receives the connection notification from the disconnection node, it records the node 1 whose mode has been changed to “relay” as the relay node in the table T3 and also lists the candidate nodes related to the disconnection node that received the connection notification. Erase from T4. If the connection notification can not be received even after a sufficient time for connection attempt, the server 4 transmits a command to change the mode of the node 1 having changed the mode to "relay” to "non-relay” .
  • FIG. 9 shows an example of processing of the server at the normal time.
  • the process shown in FIG. 9 is performed, for example, periodically. However, it may be implemented in response to some trigger (event occurrence).
  • the server 4 collects data from all the nodes 1 forming the wireless network. Data to be collected includes sensing data, battery remaining capacity, and communication quality (LQI). The remaining battery level is stored in table T1, and the communication quality (LQI) is stored in table T2.
  • the node 1 measures the remaining battery level and the LQI according to the data collection cycle regardless of whether the mode is relay or non-relay.
  • the data to be collected may be transmitted by the node 1 in response to a request from the server 4 or may be transmitted voluntarily by the node 1 at a fixed time.
  • the server 4 determines whether the candidate node recorded in the table T4 is included in the data transmission source. If it is determined that there is no candidate node, the process proceeds to 003, and waits until the next cycle (a cycle for collecting the remaining battery capacity and the communication quality). On the other hand, when it is determined that there is a candidate node, the server 4 tries to connect the candidate node and the disconnection node. Thereafter, the process proceeds to 003.
  • the server 4 sends a command to the candidate node to change the candidate node into a relay node so that the disconnection node is connected to the relay node. After that, when receiving the connection notification from the disconnection node, the server 4 records the node 1 whose mode has been changed to “relay” in the table T3 and deletes the candidate node relating to the disconnection node from the table T4. If the connection notification can not be received from the disconnection node even after a sufficient time for connection attempt, the server 4 transmits a command to return the mode of the relay node to “non-relay” to the relay node.
  • FIG. 10 shows an example of processing of the server at the time of detection of disconnection of a node.
  • the processing for FIG. 10 is performed on node 1 (node 1 disconnected from the wireless network) corresponding to the disconnection detection notification and its descendant node 1.
  • the disconnection detection notification includes the ID of the child node whose parent node has detected disconnection and its descendant nodes, and the server 4 can recognize the node or node group disconnected from the tree.
  • Each process (operation) illustrated in FIG. 10 may be executed for each disconnected node 1 (disconnected node), or may be executed collectively for a plurality of disconnected nodes 1 of each operation.
  • the following description exemplifies the processing for one node 1 corresponding to the disconnection detection notification.
  • the server 4 waits for the node 1 corresponding to the disconnection detection notification to connect to the node 1 other than the parent node for a certain period (011). If the connection notification can be received from the node 1 within a predetermined period (Yes in 012), the processing in FIG. 10 ends. On the other hand, when the connection notification can not be received from the node 1 even after the predetermined period has elapsed (No in 012), the process proceeds to 013.
  • the server 4 refers to the tables T1, T2 and T3 and the communication quality with the node 1 exceeds the communication quality threshold and the battery remaining capacity exceeds the battery remaining capacity threshold, and the mode is “non-relay” Extract (specify) node 1 of.
  • a process of trying to connect the non-relay node extracted in 013 with the node 1 is performed. That is, the server 4 changes the non-relay node to a relay node, and waits for reception of a connection notification indicating that the node 1 has connected to the relay node for a certain period.
  • connection notification it is determined whether or not the connection is successful. If the connection notification can be received within a certain period, it is determined that the server is successful (Yes in 015), and if not, it is determined that failure (No in 015).
  • the server 4 refers to the tables T1, T2 and T3 and the battery remaining amount is less than the battery remaining amount threshold (or less) and the communication quality is not higher than the communication quality threshold.
  • the relay node is extracted (specified) (016).
  • the server 4 records the non-relay node extracted at 016 in the table T4 as a candidate node for the node 1 (disconnected node) (017). Thereafter, the process of FIG. 10 ends.
  • FIG. 11 shows a processing example of the server at the time of connection attempt with a non-relay node, and shows details of the processing of 014. The process of FIG. 11 is performed for each disconnected node.
  • the server 4 transmits an instruction to change to the relay state (an instruction to change the mode to “relay”) to the non-relay node extracted in 016.
  • the server 4 stands by for a fixed period. In 023, the server 4 determines whether the disconnection node is connected within a predetermined period, that is, whether the connection notification from the disconnection node is received. If it is determined that the disconnection node is connected, the processing proceeds to 024, and if not, the processing proceeds to 025.
  • the server 4 sets the content of the mode of the connection destination node 1 of the disconnection node to “relay” in the table T3. That is, the server 4 changes the content of the information indicating the relay state or the non-relay state to the relay state.
  • the connection notification includes the ID of the node 1 of the connection destination, and in the table T3, the mode corresponding to the ID is set to "relay". This makes it possible to avoid contradiction between the mode (state) of the actual node 1 and the mode (state) of the node 1 managed by the server 4.
  • the server 4 transmits a command for returning the node 1 that has been changed to the relay state in the process of 021 to the non-relay state. Thereafter, the process of FIG. 11 ends.
  • the CPU 41 (control unit) of the server 4 does not receive the connection notification indicating the connection between the node 1 changed to the relay state by the change instruction and the disconnected node, the node 1 changed to the relay state To send a change instruction to change the state to the non-relay state. In this way, by returning the node 1 to the non-relaying state, it is possible to avoid contradiction between the mode (state) of the actual node 1 and the mode (state) of the node 1 managed by the server 4 it can. In addition, when the battery level is not full, the battery level can be recovered.
  • FIG. 12 shows an example of processing of the server at the time of connection attempt with a candidate node, and shows details of the processing of 004 of FIG.
  • the process of FIG. 12 is started on the occasion of updating of the tables T1 and T2 (updating of the remaining battery amount) which is periodically performed, as also shown in FIG.
  • the server 4 selects a candidate node whose battery remaining capacity exceeds the battery remaining capacity threshold from the list (table T4) of candidate nodes corresponding to the disconnection node.
  • the server 4 determines at 031 whether or not the candidate node could be selected. If it is determined that the candidate node has been selected, the process proceeds to 033. If not, the process of FIG. 12 ends.
  • the server 4 deletes the node 1 (referred to as a selected node) selected from the list from the list of candidate nodes.
  • the server 4 transmits an instruction to change to the relay mode to the selected node.
  • the server 4 waits for a fixed period of time to wait for reception of the connection notification.
  • the server 4 determines whether or not the disconnection node has connected to the selected node (whether or not a connection notification has been received). If it is determined that the disconnection node is connected to the selected node, the process proceeds to 037. If not, the process proceeds to 039.
  • the server 4 deletes the list of candidate nodes (all candidate nodes) corresponding to the connection node (the node 1 connected to the selection node and having transmitted the connection notification).
  • the server 4 stores the mode "relay" of the selected node in the table T3.
  • the server 4 transmits a change instruction to the non-relay state to the selected node. Thereafter, the process of FIG. 12 ends.
  • FIG. 13 shows a communication system according to scenario 1.
  • the wireless network is formed by the GW 2 and the ten nodes 1.
  • the wireless network has a tree in which GW2 is a vertex, and a node 1 (denoted as “node # 1”) with number “1” is connected to GW2, and a tree in which node 1 (node # 2) with number “2” is connected to GW2 And are formed.
  • node # 8 which is a child node of node # 4 connected to node # 1.
  • the node # 8 determines that the node # 4 is disconnected (considered).
  • the node # 4 detects the disconnection of the node # 8 which is a child node, since the alive signal is not received from the node # 8 for a certain period of time.
  • the node # 4 transmits a disconnection detection notification to the server 4.
  • the disconnection detection notification is received by the server 4 via the nodes # 1 and GW2.
  • the server 4 receives the disconnection detection notification and starts the processing shown in FIG.
  • node # 8 (disconnected node) disconnected from node # 4 broadcasts a message (signal) of a reconnection request around node # 8.
  • the server 4 waits for reception of a connection notification indicating that the node # 8 is connected to the node 1 other than the node # 4 for a certain period of time.
  • the node # 8 performs a reconnection procedure with the node 1 (the node 1 selected according to a predetermined priority in the case of a plurality of nodes 1) having received the connection response and reconnects.
  • the priority is determined based on, for example, the order of early reception of connection responses, the order of good communication quality, and the like.
  • the reconnection procedure is performed according to an existing procedure such as, for example, the procedure defined in IEEE 802.15.4.
  • the node # 8 performs a reconnection procedure with the node # 5 and connects to the node # 5.
  • Node # 8 sends a connection notification.
  • the connection notification reaches the server 4 through the node # 5, the node # 2, and the GW2.
  • the server 4 that has received the connection notification can receive the connection notification within a predetermined period, and thus ends the processing illustrated in FIG.
  • FIG. 17 shows a communication system according to scenario 2.
  • the tree configuration of the wireless network is the same as that of FIG. 13 (scenario 1).
  • node # 5, node # 7, node # 8, node # 9 and node # 10 are non-relay nodes (node 1 in non-relay state).
  • the node # 8 (disconnected node) disconnected from the node # 4 transmits a message (signal) of a reconnection request by broadcast around the node # 8.
  • the server 4 waits for reception of a connection notification indicating that the node # 8 is connected to the node 1 other than the node # 4 for a certain period of time.
  • the server 4 refers to the table T1, the table T2 and the table T3.
  • the server 4 refers to the table T3 to identify the node 1 in the non-relay state. As a result, node # 7, node # 5, node # 9, and node # 10 are identified.
  • the server 4 extracts, from the tables T1 and T2, the remaining battery capacities of the node # 7, the node # 5, the node # 9, and the node # 10, and the LQI in the case of using the node # 8 as the target ID.
  • the value measured before node # 8 is disconnected is used as the value of LQI.
  • the server 4 has the battery remaining charge threshold “15” and the communication quality threshold “10”. In this case, the server 4 extracts the node # 5 and the node # 9 as non-relay nodes in which the battery remaining amount and the LQI each exceed the corresponding threshold.
  • the server 4 transmits a change instruction to the relay state to the node # 5 and the node # 9 extracted in the operation 4 and stands by for a certain period (021 and 022 in FIG. 11).
  • the node # 8 can receive connection responses from the nodes # 5 and # 9.
  • the node # 8 performs a reconnection procedure with the node # 5 selected from the node # 5 and the node # 9, and connects to the node # 5.
  • the server 4 receives the connection notification from the node # 8.
  • the change instruction to the non-relaying state is transmitted to the server 4 that has received the connection notification and the node 1 (node # 9) other than the connection destination node 1 (node # 5).
  • node # 9 enters the non-relay state.
  • FIG. 24 shows an operation 4 of scenario 3.
  • the operations 1, 2, and 3 of the scenario 3 are the same as the operations 1 to 3 (FIGS. 17 to 19) of the scenario 2, and thus the description thereof is omitted.
  • the server 4 performs the processing from 013 onward in FIG. 10, and refers to the tables T1 to T3 to extract nonrelay nodes whose battery remaining amount and LQI with the node # 8 exceed the threshold.
  • the server 4 extracts the node # 5, the node # 7, and the node # 9 as a non-relay node in which the battery remaining amount does not exceed the threshold but the LQI exceeds the threshold.
  • the server 4 records the IDs of the nodes # 5, # 7, and # 9 in the list (table T4) of candidate nodes corresponding to the ID of the node # 8.
  • the server 4 periodically collects data including the remaining battery charge from each node 1 including the candidate node. If the battery remaining amount of the candidate node does not exceed the battery remaining amount threshold, the server 4 does not perform any particular processing.
  • the server 4 deletes the node # 5 and the node # 9 from the list of candidate nodes in the table T4, and transmits an instruction to change to the relay state to the node # 5 and the node # 9.
  • the node # 5 and the node # 9 enter the relay state (relay node) in response to the change instruction.
  • the node # 8 receives connection responses from the nodes # 5 and # 9 by transmitting the reconnection request. Then, as shown in FIG. 28, the node # 8 performs a reconnection procedure with the node # 5 selected from the node # 5 and the node # 9, connects to the node # 5, and transmits a connection notification to the server 4 .
  • the server 4 having received the connection notification transmits a change instruction to the non-relaying state to the node # 9, and changes the node # 9 to the non-relaying state. Further, the candidate node corresponding to the node # 8 is deleted from the table T4, and the node # 7 is removed from the candidate nodes. The node # 7 is treated as a non-relay node before being extracted as a candidate node.
  • the wireless network includes a node group (a plurality of nodes 1) in which each node 1 has the following configuration.
  • the environmental power generation element 11 and the storage battery 12 are provided.
  • It can be driven by receiving the power of at least one of the environmental power generation element 11 and the storage battery 12.
  • the first state (relay state) in which connection processing with the connection request source is performed in response to the connection request, and the battery power of the storage battery 12 can be recovered by the environmental power generation element 11 and does not respond to the connection request It operates in the second state (non-relaying state).
  • the server 4 operates as a control device of the wireless network.
  • the GW 2 operates as a relay device that relays communication between the control device and the wireless node.
  • Each node 1 forming the wireless network periodically measures the remaining battery level and the communication quality with the peripheral nodes, and transmits the measurement result to the server 4 via the GW 2.
  • the server 4 periodically collects information indicating the remaining battery level of each node 1 and the communication quality with the peripheral nodes, and stores the information in the table T1 and the table T2.
  • the server 4 also manages the mode (relay or non-relay) of each node 1 using the table T3.
  • Extract node 1 of The extracted node 1 is a non-relaying node 1 (non-relaying node) having communication quality connectable to the disconnection node and having the remaining battery capacity changeable to the relaying state.
  • the server 4 changes the extracted non-relay node to the relay state, and performs a connection attempt (that is, to test whether the disconnected node is connected to the node 1 (wireless network) changed to the relay state by the reconnection procedure). .
  • the node 1 changed to the relay state responds to the connection request from the disconnection node and performs reconnection processing, whereby the disconnection node is connected with the appropriate node 1 (having suitable battery remaining capacity and communication quality). , Can be reconnected to the wireless network.
  • the server 4 When the disconnection node is not connected to the node 1 (wireless network) changed to the relay state by the connection attempt, the server 4 returns the node 1 changed to the relay state to the non-relay state. This is to eliminate the contradiction between the relay and non-relay states managed in the table T4.
  • the server 4 extracts candidate nodes and stores them in the table T4.
  • the candidate node has communication quality connectable to the disconnection node (LQI with the disconnection node exceeds the threshold) but the remaining battery capacity is not sufficient to change to the relay state (non-remaining battery capacity does not meet the threshold) non It is node 1 in the relay state.
  • the server 4 relays the mode of the candidate node when the battery remaining amount of the candidate node reaches the value that can be changed to the relay state (value exceeding the threshold) at the time of periodical table T1 (battery remaining amount) update. Change to and try to connect.
  • the appropriate non-relay node having suitable battery remaining capacity and communication quality
  • the relay node and reconnected Can be done. That is, it becomes possible to maintain a wireless network.
  • the server 4 operates as a control device of a wireless network controlling the mode (relay / non-relay) of each node 1
  • the GW 2 may operate as a control device of the wireless network. That is, the control device of the wireless network may be implemented in a collection device (server 4) for collecting data transmitted from each node 1, and a relay device for relaying data transmitted from each node 1 to the collection device (GW2) may be implemented.
  • the CPU 21 of the GW 2 When the GW 2 operates as a control device of a wireless network, the CPU 21 of the GW 2 performs the processing (the processing illustrated in FIGS. 9 to 12) that the CPU 41 of the server 4 is performing.
  • Tables T1 to T4 are stored in at least one of the main storage device 22 and the auxiliary storage device 23 of the GW2. The configurations described in the embodiments are examples and can be combined as appropriate.

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

Abstract

L'invention concerne un dispositif de commande d'un réseau sans fil. Ledit réseau sans fil comprend un groupe de nœuds sans fil qui reçoivent chacun de l'énergie électrique d'une unité de collecte d'énergie et/ou d'une batterie de stockage et sont ainsi alimentés. Les nœuds fonctionnent chacun dans un premier état dans lequel un processus de connexion avec une source de demande de connexion est exécuté en réponse à une demande de connexion, et un second état dans lequel la quantité de batterie restante de la batterie de stockage peut être restaurée par l'unité de collecte d'énergie et des demandes de connexion sont ignorées. Le dispositif de commande d'un réseau sans fil stocke, pour chaque nœud sans fil, une valeur de quantité de batterie restante de la batterie de stockage, une valeur de qualité de communication d'une communication avec un autre nœud sans fil à proximité, et des informations indiquant le premier ou le second état. Lorsqu'un nœud déconnecté est détecté, le dispositif de commande spécifie un nœud sans fil dans le second état, ledit nœud sans fil ayant une valeur de quantité de batterie restante et une valeur de qualité de communication avec le nœud déconnecté qui dépassent des valeurs de seuil respectives, et transmet des instructions pour faire passer le nœud sans fil spécifié du second état au premier état, moyennant quoi le processus de connexion avec le nœud déconnecté est exécuté.
PCT/JP2017/024681 2017-07-05 2017-07-05 Dispositif de commande de réseau sans fil, procédé de commande de réseau sans fil, et système de communication WO2019008707A1 (fr)

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JP2019528266A JP6852792B2 (ja) 2017-07-05 2017-07-05 無線網の制御装置，無線網の制御方法，及び通信システム

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CN110536347A (zh) * 2019-05-16 2019-12-03 Oppo广东移动通信有限公司 一种终端的功耗控制方法、装置及存储介质
US20220322244A1 (en) * 2020-02-20 2022-10-06 Boe Technology Group Co., Ltd. Electric power balance processing method and apparatus, system, device and storage medium
WO2023062744A1 (fr) * 2021-10-13 2023-04-20 日本電信電話株式会社 Dispositif de communication sans fil esclave, système de communication sans fil, procédé de connexion dans un dispositif de communication sans fil esclave, et procédé de connexion dans un système de communication sans fil

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JP2013168792A (ja) * 2012-02-15 2013-08-29 Nippon Telegr & Teleph Corp <Ntt> アクセスポイント装置及び無線通信方法
WO2016113884A1 (fr) * 2015-01-15 2016-07-21 富士通株式会社 Appareil de commande, procédé de commande et programme de commande

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JP2013168792A (ja) * 2012-02-15 2013-08-29 Nippon Telegr & Teleph Corp <Ntt> アクセスポイント装置及び無線通信方法
WO2016113884A1 (fr) * 2015-01-15 2016-07-21 富士通株式会社 Appareil de commande, procédé de commande et programme de commande

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110536347A (zh) * 2019-05-16 2019-12-03 Oppo广东移动通信有限公司 一种终端的功耗控制方法、装置及存储介质
US20220322244A1 (en) * 2020-02-20 2022-10-06 Boe Technology Group Co., Ltd. Electric power balance processing method and apparatus, system, device and storage medium
US11758487B2 (en) * 2020-02-20 2023-09-12 Boe Technology Group Co., Ltd. Electric power balance processing method and apparatus, system, device and storage medium
WO2023062744A1 (fr) * 2021-10-13 2023-04-20 日本電信電話株式会社 Dispositif de communication sans fil esclave, système de communication sans fil, procédé de connexion dans un dispositif de communication sans fil esclave, et procédé de connexion dans un système de communication sans fil

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