WO2014097874A1 - センサネットワークシステム、および、通信経路設定方法 - Google Patents

センサネットワークシステム、および、通信経路設定方法 Download PDF

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Publication number
WO2014097874A1
WO2014097874A1 PCT/JP2013/082389 JP2013082389W WO2014097874A1 WO 2014097874 A1 WO2014097874 A1 WO 2014097874A1 JP 2013082389 W JP2013082389 W JP 2013082389W WO 2014097874 A1 WO2014097874 A1 WO 2014097874A1
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rank
sensor node
sensor
gateway device
data
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PCT/JP2013/082389
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English (en)
French (fr)
Japanese (ja)
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藤原純
中里直人
田中崇
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東京瓦斯株式会社
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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
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H04W84/22—Self-organising networks, e.g. ad-hoc networks or sensor networks with access to wired networks

Definitions

  • the present invention relates to a sensor network system that collects information from a plurality of sensor nodes and a communication path setting method.
  • Gas companies and electric power companies have installed gas meters and electric power meters at demand points in order to integrate the consumption of gas and electric power consumed by consumers. Also, in recent years, it has a communication function and performs two-way data communication with gas and electric power companies to automatically monitor the usage of gas and electricity remotely, Smart meters that can control consumer electronics from consumers are in the spotlight. Such a smart meter can also be used as an information source for enhancing the safety and utilization efficiency of infrastructure networks such as gas and electric power.
  • a smart meter is provided with a short-range wireless device to form a mesh type network
  • a star type network is formed by a mobile phone network such as 3G or LTE (Long (Term Evolution)
  • 3G or LTE Long (Term Evolution)
  • LTE Long (Term Evolution)
  • Patent Document 1 a technology for stably operating a smart meter by providing a backbone network and ad hoc communication using a wireless LAN and switching to ad hoc communication in the event of a failure of the backbone network is known (for example, Patent Document 1).
  • Patent Document 2 A technique related to network routing is also disclosed (for example, Patent Document 2).
  • (1) mesh-type network described above has high design costs for the cover area for short-range wireless devices, equipment and installation costs for base stations that collect data from the wireless devices, and maintenance costs for base stations. Problems arise, and maintenance management such as resetting the cover area by designing the area of the base station and moving or burying the utility poles where the base station is installed is extremely difficult.
  • the present invention provides a sensor network system capable of stable operation of a smart meter and improvement of fault tolerance of the system while minimizing facility cost and area design cost, and
  • the object is to provide a communication path setting method.
  • a sensor network system of the present invention includes a plurality of sensor nodes associated with a smart meter, a gateway device that collects data from the plurality of sensor nodes, and distributes the data to the sensor nodes.
  • a center device that receives data from the gateway device and transmits data to the gateway device, wherein wireless communication is performed between the sensor nodes and between the sensor node and the gateway device, and the gateway device and the center device During this period, wireless communication through a pay communication network is performed.
  • the rank setting unit When the rank setting unit becomes unable to wirelessly communicate with a sensor node with a higher rank, the rank setting unit may associate itself with a rank one lower than the sensor node with the highest rank among the sensor nodes capable of wireless communication.
  • the rank setting unit may limit the rank of the sensor node to a predetermined rank.
  • a sensor node receives data from a sensor node higher than its own rank, broadcasts the data, and when there is no sensor node lower than its own rank within a wireless communication range, data transmission / reception that restricts data broadcasting A part may be further provided.
  • the present invention it is possible to stably operate the smart meter and improve the fault tolerance of the system while minimizing the equipment cost and the area design cost.
  • FIG. 1 is an explanatory diagram showing a schematic configuration of the sensor network system 100.
  • the sensor network system 100 includes a plurality of sensor nodes 110, a plurality of gateway devices 112, and a center device 114.
  • the sensor network system 100 is associated with a smart meter.
  • a smart meter is a device that is used when gas is supplied from a gas company to a consumer, or when electricity is supplied from a power company to a consumer, and automatically measures at least the amount of gas or electricity used.
  • Sensor node 110 corresponds to each smart meter, and at least transmits and receives data used in the smart meter.
  • the gateway device 112 can correspond to a smart meter, like the sensor node 110, collects data of one or more sensor nodes 110, and distributes data to the one or more sensor nodes 110.
  • the center device 114 is configured by a computer or the like, is a device belonging to the manager of the sensor network system 100 such as a gas company or a power company, collects data of one or more gateway devices 112, and also includes one or more The data is distributed to the gateway device 112.
  • an existing pay communication network in which a communication fee is generated according to the communication amount such as a mobile phone network including the base station 116 or a PHS (Personal Handyphone System) network Wireless communication through is performed.
  • wireless communication is performed between the sensor nodes 110 and between the sensor node 110 and the gateway device 112 through, for example, a smart meter wireless system (U-Bus Air) using the 920 MHz band.
  • the wireless communication between the sensor nodes 110 and between the sensor node 110 and the gateway device 112 is assumed to be free. However, at least between the gateway device 112 and the center device 114 regardless of whether it is charged or free. The communication cost should be lower than the wireless communication.
  • the gateway device 112 is connected to the center device 114 through a pay communication network and to each sensor node 110 through a smart meter wireless system.
  • a smart meter is arranged for each of a plurality of consumers.
  • the sensor node 110 or the gateway device 112 is associated with each smart meter, and the center device 114 collects information on the smart meter or controls the smart meter through the sensor node 110 or the gateway device 112. Therefore, the sensor node 110 and the gateway device 112 are arranged at any position where the consumer exists.
  • the gateway device 112 uses the smart meter wireless system and the pay communication network together, and uses the existing pay communication network without separately providing a base station dedicated to the smart meter wireless system. Communication between 114 and the sensor node 110 can be established easily and inexpensively. Further, in the combination of the gateway device 112 and a plurality of surrounding sensor nodes 110, only the gateway device 112 uses the pay communication network, and all the other sensor nodes 110 use the smart meter wireless system that does not incur communication charges. is doing. Therefore, the communication cost can be significantly reduced.
  • the smart meter wireless system Since the smart meter wireless system is assumed to be a short-range wireless communication, relatively little power is consumed for wireless communication. Therefore, the sensor node 110 can be powered by a battery or the like, and the power consumption of the sensor network system 100 can be reduced. In addition, the pay communication network is relatively easy to consume power as compared with the smart meter wireless system, and therefore requires a large capacity battery or a separate power source. However, since the absolute number of the gateway devices 112 is smaller than that of the sensor node 110, the power consumption can be extremely reduced as compared with the case where the mobile phone network is used from all the smart meters. Hereinafter, the arrangement of the sensor node 110 and the gateway device 112 will be described in detail.
  • FIG. 2 is an explanatory diagram showing the connection relationship of the sensor network. As shown in FIG. 2, in the present embodiment, a plurality of gateway devices 112 are connected to the center device 114, and a plurality of sensor nodes 110 are connected to the respective gateway devices 112.
  • the sensor node 110 is realized by short-range wireless communication, wireless communication with the gateway device 112 is not always established. In that case, the sensor node 110 is connected to the gateway device 112 by hopping another sensor node 110 capable of wireless communication.
  • a graded rank is assigned to each sensor node 110, and the sensor node 110 is managed based on the rank.
  • the gateway device 112 is assumed to be rank 0, and the sensor node 110 directly connected to the gateway device 112 without hops is assumed to be rank 1.
  • the ordinal number of the rank is incremented by 1 according to the number of hops.
  • a rank is assigned as shown in FIG. 2, data exchanged between the center device 114 and each sensor node 110 is hopped and transmitted in the order according to the rank. For example, when data is transmitted from the center device 114 to the sensor node 110 of rank 2, the data is transmitted via the gateway device 112 corresponding to rank 0 and the sensor node 110 of rank 1.
  • a schematic configuration of the gateway device 112 and the sensor node 110 will be given and how the connection relation on the sensor network system 100 is established will be described.
  • FIG. 3 is a functional block diagram showing a schematic configuration of the gateway device 112.
  • the gateway device 112 includes a communication unit 130, a storage unit 132, and a central control unit 134.
  • the communication unit 130 establishes wireless communication with the center device 114 (base station 116) through the pay communication network and establishes wireless communication with the sensor node 110.
  • the storage unit 132 includes a ROM, a RAM, a flash memory, an HDD, and the like, and stores programs used for the gateway device 112 and various data, for example, a lower rank table described later.
  • the central control unit 134 includes a CPU and a DSP (Digital Signal Processor), and controls the entire gateway device 112 using a program stored in the storage unit 132.
  • the central control unit 134 functions as a beacon transmission unit 142, a table generation unit 144, a table transmission unit 146, and a data transmission / reception unit 148.
  • the beacon sending unit 142 sends information for identifying itself, for example, a beacon including an identifier (ID) and a rank (rank 0) to the outside through the communication unit 130 at a predetermined time, for example, every 5 seconds. Make a call (broadcast).
  • ID an identifier
  • rank 0 a rank
  • the table generation unit 144 generates a lower rank table according to a beacon received from the sensor node 110 at a predetermined time, for example, every hour.
  • FIG. 4 is an explanatory diagram for explaining the lower rank table.
  • the lower rank table 170 includes an identifier, a rank (fixed to rank 1), an electric field strength, a remaining battery level (or the number of past communications), and a lower rank table of one or more rank 1 sensor nodes 110 that have received a beacon. 170 is included.
  • the lower rank table 170 further includes a lower rank table 170 related to the sensor node 110 of the lower rank. Therefore, the lower rank table 170 regarding all the sensor nodes 110 capable of transmitting information through the gateway device 112 is included.
  • the table transmission unit 146 transmits the latest lower rank table 170 held by the gateway device 112 to the center apparatus 114 at a predetermined time, for example, every day (24 hours). To do.
  • the data transmission / reception unit 148 receives data from the center device 114 through the communication unit 130 at the beacon transmission timing by the beacon transmission unit 142 and transmits (broadcasts) the received data.
  • the data transmission / reception unit 148 transmits the data received from the sensor node 110 to the center device 114.
  • FIG. 5 is a functional block diagram illustrating a schematic configuration of the sensor node 110.
  • the sensor node 110 includes a communication unit 150, a storage unit 152, and a central control unit 154.
  • the communication unit 150 establishes wireless communication with the gateway device 112 and other sensor nodes 110.
  • the storage unit 152 includes a ROM, a RAM, a flash memory, an HDD, and the like, and stores programs and various data used for the sensor node 110, such as a lower rank table 170 and an upper rank table described later.
  • the central control unit 154 is composed of a CPU and a DSP, and controls the entire sensor node 110 using a program stored in the storage unit 152.
  • the central control unit 154 functions as a rank setting unit 160, a beacon transmission unit 162, a table generation unit 164, a table transmission unit 166, and a data transmission / reception unit 168.
  • the rank setting unit 160 selects one or a plurality of sensor nodes 110 having the highest rank (ordinal number is the minimum value) among the gateway devices 112 or other sensor nodes 110 with which the wireless communication can be performed by itself.
  • the node 110 (or the gateway device 112) is set, and the next lower rank is set as its own rank. In this way, it is possible to rank all sensor nodes 110 that can wirelessly communicate with the gateway device 112 or the sensor node 110.
  • the sensor node 110 includes one or more sensor nodes 110 that are one higher than its own rank, and one or more sensor nodes 110 that are one lower than its own rank. Communication connection will be established. Note that communication connection is not established with the sensor node 110 having the same rank as the self.
  • the sensor network system 100 can perform other communication routes. Can be secured. Therefore, stable operation of the smart meter and improvement in fault tolerance of the system can be achieved.
  • the sensor node 110 capable of wireless communication cannot be wirelessly communicated according to the radio wave environment or the output power of the sensor node 110. Or the sensor node 110 that has been unable to perform wireless communication may be able to perform wireless communication. Therefore, the sensor node 110 transitions to the rank in which the sensor node 110 should be located according to the situation at that time, and updates the sensor node 110 of the higher rank and the sensor node 110 of the lower rank.
  • the rank setting unit 160 when the rank setting unit 160 becomes unable to wirelessly communicate with the sensor node 110 whose rank is higher, the rank setting unit 160 is one lower than the sensor node 110 whose rank is the highest (ordinal is the minimum value) among the sensor nodes 110 capable of wireless communication Is set as its own rank.
  • the lower rank sensor node 110 capable of wireless communication with itself may also change. In this way, management of the sensor node 110 capable of wireless communication by rank can be maintained.
  • the beacon transmission unit 162 transmits information for identifying itself, for example, a beacon including the identifier and the rank set by the rank setting unit 160 to the outside through a communication unit 150 at a predetermined time, for example, every 5 seconds. Make a call (broadcast).
  • the table generation unit 164 generates the upper rank table and the lower rank table 170 in accordance with a beacon received from another sensor node 110 at a predetermined time, for example, every hour. To do. Since the lower rank table 170 is substantially the same as the lower rank table 170 used in the gateway device 112, only the upper rank table will be described here.
  • FIG. 6 is an explanatory diagram for explaining the upper rank table.
  • the upper rank table 172 includes an identifier, a rank, an electric field strength, and a remaining battery level (or past number of communication) of one or more sensor nodes 110 that are one rank higher than its own rank.
  • the rank setting unit 160 sets itself as rank 1, so that the table generation unit 164 has a gateway of rank 0 in the higher rank table 172.
  • Device 112 is shown.
  • the rank setting unit 160 sets itself as rank 2, so the table generation unit 164 stores the rank-1 sensor node in the higher rank table 172. 110 is shown.
  • the table transmission unit 166 receives a beacon (identifier) from information held in the sensor node 110 in response to a request from the gateway device 112 or another sensor node 110 at a predetermined time, for example, every hour. , Rank) (not transmitted only by a beacon), information necessary for generation of the lower rank table 170, for example, the remaining battery level of the sensor node 110, and the latest lower rank table 170 of the sensor node 110 ( (Hereinafter simply referred to as insufficient information) is transmitted to the requested gateway device 112 or sensor node 110.
  • a beacon identifier
  • Rank not transmitted only by a beacon
  • information necessary for generation of the lower rank table 170 for example, the remaining battery level of the sensor node 110
  • the latest lower rank table 170 of the sensor node 110 (Hereinafter simply referred to as insufficient information) is transmitted to the requested gateway device 112 or sensor node 110.
  • the data transmission / reception unit 168 receives data from the gateway device 112 or the sensor node 110 through the communication unit 150 at the beacon transmission timing by the beacon transmission unit 162 and transmits the received data to other sensor nodes 110 (broadcast). To do.
  • the data transmission / reception unit 168 transmits the data received from the sensor node 110 to the gateway device 112 or another sensor node 110.
  • the sensor node 110 when the sensor node 110 cannot directly wirelessly communicate with the gateway device 112, the sensor node 110 is connected to the gateway device 112 by hopping another sensor node 110 capable of wireless communication. Therefore, the data transmission / reception unit 168 receives and transmits data based on the rank set for each sensor node 110.
  • the data connection route (routing) will be described by dividing the data downlink from the center device 114 to the sensor node 110 to be transmitted and the data uplink from the sensor node 110 to the center device 114.
  • the center device 114 indicates the identifiers of all the sensor nodes 110 included in the lower rank table 170 together with the sensor node 110 to be transmitted in a message, and transmits it to the gateway device 112 having the lower rank table 170. To do.
  • the gateway device 112 transmits data to the sensor node 110 of rank 1, sequentially transmits the data to the sensor node 110 of lower rank, and transmits the data to the sensor node 110 that is the final transmission target.
  • the data transmission / reception units 148 and 168 of the gateway device 112 and each sensor node 110 are connected to a.
  • the optimum sensor node 110 is selected as a transmission destination by a function that takes into account one or more parameters selected from the sensor nodes 110 in which communication traffic is distributed.
  • the sensor node 110 that is the transmission target that has received the data sends the response data to d. Reply by the route the data came in, or e.
  • the higher rank table 172 one of means for replying through the partner with the highest electric field strength is selected. At this time, if the reply fails, the reply arrival rate can be increased by selecting another route and retransmitting.
  • the data transmission / reception unit 168 of the sensor node 110 transmits data through the other party having the highest electric field strength in the higher rank table 172, and the received sensor node 110 also transmits data through the other party having the highest electric field strength. To do.
  • the sensor node 110 that is included in the route indicates its own identifier in a message.
  • the transmission arrival rate can be increased by selecting another route and retransmitting.
  • the center device 114 that has received the data transmits response data along the route indicated in the message.
  • the reason that the beacon is transmitted every 5 seconds is to increase the response time of the entire sensor network system 100, and the data transmission / reception units 148 and 168 transmit the beacon when a data transmission event occurs.
  • the data is transmitted within 5 seconds after the event occurs even at the latest.
  • the reason why the gateway device 112 transmits the lower rank table 170 to the center device 114 every day is to confirm that the sensor network system 100 is functioning normally.
  • the use of the pay communication network of the gateway device 112 can be kept to a minimum, and the communication cost can be reduced. .
  • FIGS. 7 to 10 are flowcharts showing the flow of rank setting processing of the sensor node 110 in the communication path setting method.
  • FIGS. 7 and 8 show the processing of the gateway device 112
  • FIGS. 9 and 10 show the processing of the sensor node 110
  • FIGS. 7 and 9 show timer interrupts that are interrupted periodically by a timer.
  • FIG. 8 and FIG. 10 show reception interrupt processing in which an interrupt occurs in response to reception of a beacon.
  • the rank of the sensor node 110 changes in accordance with movement or changes in the radio wave environment.
  • the gateway device 112 has no rank transition (fixed to rank 0).
  • the device date counter, the device time counter, and the node time counter are operated to count the passage of time.
  • a timer interrupt occurs in the gateway device 112 every predetermined time, here every 5 seconds.
  • the table transmission unit 146 transmits the lower rank table 170 managed by itself to the center apparatus 114 through the pay communication network (S202). Then, the table transmission unit 146 resets the device date counter (S204). If the device date counter has not reached one day (NO in S200), the table transmission unit 146 increments the device date counter by 1 (S206). Thus, the latest lower rank table 170 can be uploaded to the center device 114 every day.
  • the beacon sending unit 142 sends a beacon including information for identifying itself, for example, an identifier and a rank (corresponding to rank 0) (S216), and ends the timer interrupt process.
  • the interruption cycle is 5 seconds, the beacon is transmitted every 5 seconds.
  • the gateway device 112 receives a beacon from the sensor node 110, a reception interrupt occurs.
  • the table generation unit 144 determines whether the device update permission flag is ON (S250). As a result, if the device update permission flag is ON, that is, if the update timing for every hour has arrived (YES in S250), the table generation unit 144 determines that its lower order is based on the received beacon.
  • the rank table 170 is updated (S252), and the device update permission flag is turned OFF (S254). If the device update permission flag is not ON (NO in S250), the reception interrupt process is terminated.
  • the table generation unit 144 adds a sensor node 110 that is newly enabled for wireless communication, overwrites an existing sensor node 110, and deletes a sensor node 110 that has been set but is disabled for wireless communication. I do. At this time, the table generation unit 144 acquires deficiency information (remaining battery level of the sensor node 110 of rank 1 and the lower rank table 170) through wireless communication, and measures the electric field strength of each sensor node 110 of rank 1.
  • a timer interrupt occurs in the sensor node 110 every predetermined time, here, every 5 seconds.
  • Such a node update permission flag is a flag for updating information received from another sensor node 110, similarly to the device update permission flag. Then, the table generating unit 164 resets the node time counter (S304).
  • the table generating unit 164 increments the node time counter by 1 (S306).
  • the lower rank table 170 can be updated every hour.
  • the beacon sending unit 162 sends a beacon including information for identifying itself, for example, an identifier and a rank (S308), and ends the timer interrupt process.
  • a beacon including information for identifying itself, for example, an identifier and a rank (S308), and ends the timer interrupt process.
  • the interruption cycle is 5 seconds, the beacon is transmitted every 5 seconds.
  • the rank setting unit 160 determines whether or not the node update permission flag is ON (S350). As a result, if the node update permission flag is ON, that is, if the update timing for every hour has arrived (YES in S350), the sensor node 110 having a higher rank than its own rank is included in the received beacon. If there is a higher rank sensor node 110 (YES in S352), the process proceeds to step S354, and if there is no higher rank sensor node 110 (NO in S352), the process proceeds to step S358. Migrate processing. If the node update permission flag is not ON (NO in S350), the reception interrupt process is terminated.
  • the rank setting unit 160 determines whether there is a sensor node 110 that is two or more ranks higher than its own rank (S354). In step S354, the rank setting unit 160 shifts the rank of the sensor node 110 to the higher rank by setting a rank one lower than the sensor node 110 as its own rank (S356). If there is no sensor node 110 with a rank higher than two (NO in S354), the process proceeds to step S364.
  • rank setting unit 160 determines whether or not sensor node 110 (identifier) is present in the received beacon (S358). If the sensor node 110 is capable of wireless communication (YES in S358), the rank of the sensor node 110 is shifted to the lower rank by setting a rank one lower than the highest rank sensor node 110 (S360). Then, the process proceeds to step S364. If there is no sensor node 110 (NO in S358), the rank setting unit 160 sets itself as a sensor node 110 having no rank, that is, a stand-alone sensor node 110 (S362), and the process proceeds to step S364. Transition.
  • the table generating unit 164 updates its own upper rank table 172 based on the received beacon (S364), updates the lower rank table 170 (S366), and turns off the node update permission flag (S368). Then, the reception interrupt process is terminated. Specifically, the table generation unit 164 adds a new sensor node 110 that can wirelessly communicate, overwrites an existing sensor node 110, and deletes a sensor node 110 that has been set but cannot wirelessly communicate. I do. At this time, the rank setting unit 160 acquires deficiency information (the remaining battery level of the sensor node 110, the lower rank table 170) through wireless communication, and measures the electric field strength of each sensor node 110.
  • deficiency information the remaining battery level of the sensor node 110, the lower rank table 170
  • the transmission rate of data is improved by giving the rank unlimited.
  • the smart sensor to which the sensor node 110 of this embodiment is associated is fixed for each consumer, the position can be managed (understood). Therefore, the lowest rank can be limited by adjusting the number of gateway devices 112 and the distance between gateway devices 112.
  • the rank setting unit 160 limits the rank of the sensor node 110 to a predetermined rank (the ordinal number is a predetermined value or less).
  • the rank is limited to 2 or less.
  • FIG. 11 is an explanatory diagram showing the positional relationship between the gateway device 112 and the sensor node 110 when the rank is limited to two.
  • the sensor nodes 110 are arranged in a mesh pattern, and the gateway device 112 is arranged at an arbitrary position.
  • the radius R 1st of the circle 402 corresponding to the communicable range of the gateway device 112, that is, the electric field strength (depending on transmission side power and reception side sensitivity) is 1.8 times or more the distance T Node between the sensor nodes 110 (for example, If it is 20 mW or more), one gateway device 112 can wirelessly communicate with ten sensor nodes 110 without hops.
  • one gateway device 112 can manage ten sensor nodes 110. Further, even if the gateway device 112 and the sensor node 110 do not function temporarily due to maintenance or replacement, the communication path can be maintained through the other sensor nodes 110, so that the operation of the sensor network system 100 can be maintained.
  • the meter when replacing an existing gas meter or electric meter with a smart meter, it is possible to replace the meter in 10 times (one time / year replacement if the life cycle of the gas meter is 10 years). For example, a 10% gas meter is replaced with a smart meter at an appropriate interval for the first time. At this time, the gateway device 112 is associated with the smart meter. After that, it is only necessary to replace the 10% gas meter with the smart meter each time and associate the sensor node 110 with the smart meter. Thus, the sensor network system 100 can be easily applied.
  • the sensor network system 100 and the communication path setting method according to the present embodiment minimizes the equipment cost and the area design cost, and enables stable operation of the smart meter and the fault tolerance of the system. Can be improved.
  • a program that causes the computer to function as the gateway device 112 or the sensor node 110, and a computer-readable storage medium such as a flexible disk, magneto-optical disk, ROM, CD, DVD, or BD on which the program is recorded.
  • the program refers to data processing means described in an arbitrary language or description method.
  • each step in the communication path setting method of the present specification does not necessarily have to be processed in time series in the order described in the flowchart, and may include processing in parallel or by a subroutine.
  • the present invention can be used in a sensor network system that collects information from a plurality of sensor nodes and a communication path setting method.
  • DESCRIPTION OF SYMBOLS 100 ... Sensor network system 110 ... Sensor node 112 ... Gateway apparatus 114 ... Center apparatus 142, 162 ... Beacon transmission part 144, 164 ... Table generation part 146, 166 ... Table transmission part 148, 168 ... Data transmission / reception part 160 ... Rank setting part

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  • Signal Processing (AREA)
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PCT/JP2013/082389 2012-12-20 2013-12-02 センサネットワークシステム、および、通信経路設定方法 WO2014097874A1 (ja)

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TWI632790B (zh) * 2016-12-06 2018-08-11 財團法人工業技術研究院 通訊路徑管理方法及通訊路徑管理系統
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JP6931319B2 (ja) * 2017-11-29 2021-09-01 東京瓦斯株式会社 センサネットワークシステムの設計方法およびそのプログラム
JP6955447B2 (ja) * 2018-01-04 2021-10-27 東京瓦斯株式会社 センサネットワークシステムおよびセンター装置
JP6524304B2 (ja) * 2018-04-23 2019-06-05 株式会社東芝 無線通信装置、無線通信システム、無線通信方法及びプログラム
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