WO2018216831A1 - Modem de communication sans fil et procédé de commande associé - Google Patents

Modem de communication sans fil et procédé de commande associé Download PDF

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Publication number
WO2018216831A1
WO2018216831A1 PCT/KR2017/005424 KR2017005424W WO2018216831A1 WO 2018216831 A1 WO2018216831 A1 WO 2018216831A1 KR 2017005424 W KR2017005424 W KR 2017005424W WO 2018216831 A1 WO2018216831 A1 WO 2018216831A1
Authority
WO
WIPO (PCT)
Prior art keywords
wireless communication
battery
sensor
life
server
Prior art date
Application number
PCT/KR2017/005424
Other languages
English (en)
Korean (ko)
Inventor
백준선
Original Assignee
(주)누리텔레콤
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by (주)누리텔레콤 filed Critical (주)누리텔레콤
Publication of WO2018216831A1 publication Critical patent/WO2018216831A1/fr

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Classifications

    • 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
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
    • 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
    • H04Q—SELECTING
    • H04Q2209/00—Arrangements in telecontrol or telemetry systems
    • H04Q2209/40—Arrangements in telecontrol or telemetry systems using a wireless architecture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2209/00—Arrangements in telecontrol or telemetry systems
    • H04Q2209/80—Arrangements in the sub-station, i.e. sensing device
    • H04Q2209/82—Arrangements in the sub-station, i.e. sensing device where the sensing device takes the initiative of sending data
    • H04Q2209/826—Arrangements in the sub-station, i.e. sensing device where the sensing device takes the initiative of sending data where the data is sent periodically
    • 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 wireless communication modem and a method for changing the transmission period of the wireless communication modem.
  • a communication cable, a power cable or a sewer is buried underground, and a cavity for embedding such a communication cable, a power cable or a sewer is provided. Therefore, a manhole is installed at every predetermined section in order to allow management personnel to enter and exit the corresponding community.
  • a remote system has been developed to reduce the number of manpower required so that management personnel can not enter and manage the community ball every time through a system that remotely monitors the temperature and humidity inside the manhole to manage the community ball.
  • such a remote sensing system receives information on the environment inside the manhole through potential sensors, as well as sensors such as temperature and humidity, and transmits the received measurement data to the outside of the manhole through a communication unit, but outside of the manhole cover.
  • the antenna installed on the surface transmits to the server, and the server can grasp the situation inside the manhole based on the received measurement data.
  • the life of the battery may vary according to the temperature, humidity, etc. inside the manhole, there is a problem that additional manpower may be required when the life of the battery is shortened than the expected replacement time of the battery.
  • a method of controlling a wireless modem and a wireless modem for controlling the use of the battery for a predetermined period of time by predicting the life of the wireless modem modem, which varies according to a situation such as temperature and humidity inside the manhole To provide.
  • a bus communication modem and a wireless communication modem control method for performing communication to shorten a data transmission cycle to quickly cope with an emergency situation are provided. to provide.
  • the battery for supplying a wireless communication power; A wireless communication unit performing wireless communication with; And an electronic control unit configured to receive a measurement signal from a sensor installed inside the manhole, determine a wireless communication cycle according to the life of the battery, and perform wireless communication in the determined wireless communication cycle.
  • a wireless communication unit performing wireless communication with
  • an electronic control unit configured to receive a measurement signal from a sensor installed inside the manhole, determine a wireless communication cycle according to the life of the battery, and perform wireless communication in the determined wireless communication cycle.
  • the electronic control unit may receive the life information of the battery from the server.
  • the electronic control unit may transmit a signal measured from the sensor to the server in the determined wireless communication cycle.
  • the electronic control unit may extend or shorten the wireless communication cycle in order to ensure a predetermined battery life.
  • the electronic control unit may shorten the wireless communication cycle when the magnitude of the signal measured from the sensor exceeds a preset threshold.
  • the electronic control unit may normalize the wireless communication period when the shortened wireless communication period is less than a preset threshold of the signal measured from the sensor.
  • the electronic control unit may obtain the changed life information of the battery calculated based on the measured signal received by the server.
  • the sensor installed inside the manhole may include at least one of a temperature sensor and a humidity sensor.
  • the electronic control unit may predict the life of the battery and extend the wireless communication period to ensure the life of the predicted battery.
  • the electronic control unit may predict the life of the battery based on the temperature, humidity, and weather information obtained from the server.
  • the step of supplying wireless communication power from a battery; and receiving a measurement signal from a sensor installed in the manhole; Determining a wireless communication cycle according to the battery life, and receiving wireless battery power during the determined wireless communication cycle to perform wireless communication; Wireless communication modem control method comprising a can be provided.
  • the battery life information may be received from the server.
  • the signal measured from the sensor may be transmitted to the server in the determined wireless communication period.
  • the determining of the wireless communication cycle according to the battery life may extend or shorten the wireless communication cycle in order to secure a predetermined battery life.
  • the determining of the wireless communication cycle according to the battery life may shorten the wireless communication cycle when the magnitude of the signal measured by the sensor exceeds a preset threshold.
  • the determining of the wireless communication cycle according to the battery life may normalize the wireless communication cycle when the shortened wireless communication cycle is less than a preset threshold of the signal measured from the sensor.
  • the changed life information of the battery calculated based on the signal measured by the sensor received by the server may be obtained.
  • the sensor installed inside the manhole may include at least one of a temperature sensor and a humidity sensor.
  • the determining of the wireless communication cycle according to the battery life may predict the life of the battery and extend the wireless communication cycle to secure the predicted battery life.
  • the estimating the life of the battery may predict the life of the battery based on temperature, humidity, and weather information obtained from a server.
  • the life of the wireless modem modem varies depending on a situation such as temperature and humidity inside the manhole, so that the battery can be used without replacement for a period of time. In this way, no additional personnel are required to replace the battery.
  • a data transmission cycle may be shortened to quickly cope with an emergency situation.
  • FIG. 1 is a schematic diagram illustrating a wireless communication modem installed in a manhole, a plurality of sensors connected thereto, and a server according to an exemplary embodiment.
  • FIG. 2 is a control block diagram of a wireless communication modem according to one embodiment.
  • FIG. 3 is a flowchart illustrating a communication operation of a wireless communication modem according to an embodiment.
  • FIG. 4 is a flowchart illustrating a communication operation of a wireless communication modem according to another embodiment.
  • FIG. 5 is a flowchart illustrating a communication operation of a wireless communication modem according to an embodiment.
  • FIG. 6 is a flowchart illustrating an operation control method of a wireless communication modem according to an embodiment.
  • FIG. 1 is a schematic diagram illustrating a configuration of a wireless communication modem 1 installed in a manhole, a plurality of sensors 10 to 50 connected thereto, and a server 200 according to an embodiment
  • FIG. 2 is a wireless communication modem 1 ) Is a block diagram showing the configuration of a.
  • the wireless communication modem 1 may be mounted inside a manhole.
  • the wireless communication modem 1 may be fixedly installed at a position below the manhole cover 100.
  • the wireless communication modem 1 drives a plurality of sensors 10 to 50 to transmit the detected sensor detection data to the server 200 through the communication antenna 2. Accordingly, the wireless communication modem 1 periodically receives sensor detection data detected from the plurality of sensors 10 to 50, and supplies a battery to the wireless communication modem 1 to wirelessly transmit the received detection data. It includes (3).
  • the wireless communication modem 1 can be operated normally while the life of the battery 3 is maintained.
  • the wireless communication modem 1 includes an input unit 11 including a plurality of sensors 10 to 50 of FIG. 1, and a battery for supplying power to the wireless communication modem 1. 3), an electronic control unit 300 which collectively controls the wireless communication modem 1, and a wireless communication unit 400 which receives a control signal from the electronic control unit 300 and performs wireless communication.
  • the wireless communication unit 400 may perform wireless communication through the antenna 2 shown in FIG. 1.
  • the input unit 11 includes a plurality of sensors 10 to 50 shown in FIG. 1, and detects an environmental element such as a temperature and humidity in a manhole. .
  • the first sensor 10 among the plurality of sensors may be a temperature sensor and measure a temperature inside the manhole.
  • the second sensor 20 among the plurality of sensors may be a humidity sensor and may measure humidity inside the manhole.
  • the third sensor 30 may check whether or not the water pipe embedded in the basement as the potential sensor 30 is corroded.
  • the potential sensor may be installed in an embedded sewer to measure the corrosion of the sewer and provide the information to the wireless communication modem 1.
  • the fourth sensor 40 may be an optical sensor, and may measure whether the manhole is opened by measuring whether the manhole is opened or closed.
  • the fifth sensor 50 may be a flooding sensor of the manhole cover 100, and may provide a signal detected by the flooding sensor to the wireless communication modem 1.
  • a plurality of sensors 10 to 50 included in the input unit 11 to be described later may include a gas sensor (gas sensor) to measure the component of the leaked gas and its leakage amount.
  • the plurality of sensors 10 to 50 included in the input unit 11 are described as the first sensor 10 to the fifth sensor 50 in FIG. 1, the present disclosure is not limited thereto, and the environment inside the manhole may be detected. Various sensors may be included.
  • the battery 3 supplies power to the wireless communication modem 1 according to the present invention, and operates the electricity stored in the battery 3 to the electronic control unit 300 and the wireless communication unit 400. It serves to supply power.
  • the battery 3 transmits the remaining power of the battery to the electronic control unit 300 to supply information so that the electronic control unit 300 can predict the life.
  • the electronic control unit 300 collectively controls the wireless communication modem 1 according to the present invention, and receives sensor values from the input unit 11 including the plurality of sensors 10 to 50 to predict the life of the battery. And a main processor 310 for determining a wireless communication cycle of the wireless communication modem 1 and a memory 320 for storing various data.
  • the main processor 310 receives temperature and humidity information inside the manhole from the input unit 11. In addition, the main processor 310 may obtain external weather information from the server 200 through the wireless communication unit 400 to be described later.
  • the main processor 310 receives the information on the battery life characteristic curve from the battery 3, the server 200 through the temperature, humidity, or the wireless communication unit 400 inside the manhole received from the input unit 11 In consideration of the external weather information input from), it is possible to predict the amount of change in the battery life characteristic curve and to predict the battery life.
  • the main processor 310 is required to replace the battery when the life of the battery 3 is shorter than the life set in advance at the time of installation of the wireless communication modem 1, thereby extending the life expectancy of the wireless communication modem (1) To extend the radio communication cycle of the battery (1). That is, the main processor 310 extends the sleep mode state of the wireless communication modem 1.
  • the main processor 310 when the radio communication cycle of the initial radio communication modem 1 performs radio communication three times a day, that is, every 8 hours, the main processor 310 of the radio communication modem 1 In order to extend the lifespan, the wireless communication cycle may be controlled to be changed once a day, that is, every 24 hours.
  • the radio communication cycle is changed in consideration of the estimated battery remaining amount according to the battery life curve.
  • the main processor 310 extends the period of transmitting the sensor value obtained from the input unit 11 to the server 3 to increase the life of the wireless communication modem (1).
  • the main processor 310 sets a threshold value to sensor values received by the plurality of sensors 10 to 50, and narrows the measurement period of acquiring the sensor value from the sensor inside the manhole when the threshold value is exceeded.
  • the input / receiver 11 may adjust a transmission / reception period of sensor information from the input unit 11 to the electronic control unit 300.
  • the electronic control unit 300 may narrow the operation period of the water level sensor. However, when the measured water level of the water level sensor is returned to the normal range again, the electronic control unit 300 may increase the operation period to the original again.
  • the electronic control unit 300 may narrow the operation period of the gas sensor. However, the electronic control unit 300 may increase the operation cycle to the original again when the measured gas leakage amount of the gas sensor is returned to within the normal range.
  • the memory 320 in the electronic control unit 300 may be a flash memory, a read only memory, an erasable as well as a volatile memory such as an S-RAM or a D-RAM.
  • Non-volatile memory such as Programmable Read Only Memory (EPROM), Electrically Erasable Programmable Read Only Memory (EPROM), and the like.
  • EPROM Programmable Read Only Memory
  • EPROM Electrically Erasable Programmable Read Only Memory
  • the nonvolatile memory can semi-permanently store the control program and control data for controlling the operation of the wireless communication modem 1, and the volatile memory temporarily stores the control program and control data from the nonvolatile memory.
  • various control signals output from the main processor 310 may be temporarily stored.
  • the wireless communication unit 400 performs wireless communication with the server 3, and transmits various control signals from the electronic control unit 300 to the server 200, or the server ( Various control signals and external weather information may be received from 200.
  • the wireless communication unit 400 may perform wireless communication through the antenna 3 of the wireless communication modem 1 shown in FIG. 1.
  • the wireless communication unit 400 may receive external weather information from the server 200. Accordingly, the wireless communication unit 400 provides external weather information from the server 200 to the wireless communication modem 1 to provide information for estimating the life curve of the battery 3 of the wireless communication modem 1.
  • the wireless communication unit 400 receives external weather information from the server 200 according to a preset wireless communication cycle, and based on the received information, the electronic control unit 300 of the wireless communication modem 1 is a battery. Predict the life of (3).
  • the wireless communication unit 400 may transmit the sensor value obtained from the input unit 11 to the server 200 through wireless communication. That is, the electronic control unit 300 maintains the wireless communication modem 1 in the sleep mode during the wireless communication cycle, and then transfers the sensor value obtained when the modem cycle reaches the server 200 through wireless communication through the wireless communication unit 400. send.
  • the wireless communication modem 1 transmits sensor information from the wireless communication modem 1 to the server 200 when the sensor value acquired through the input unit 11 exceeds a preset threshold. By shortening the risk situation may be sent to the server 200 quickly.
  • the wireless communication cycle transmitted from the wireless communication modem 1 to the server 200 is restored to the original state. You can also increase the communication period.
  • the server 200 is based on the sensor value obtained from the wireless communication modem 1 and the battery life information and external weather information, the life of the battery 3 of the wireless communication modem 1 It is also possible to instruct the electronic control unit 300 of the wireless communication modem 1 to extend the wireless communication period in order to predict the length of time and to extend the predetermined lifetime.
  • the server 200 may transmit a control signal to the wireless communication modem 1 to predict the expected battery life of the wireless communication modem 1 and to change the wireless communication period in order to secure a desired battery life. Accordingly, the electronic control unit 300 of the wireless communication modem 1 may transmit the sensor value obtained from the input unit 11 to the server 200 according to the changed wireless communication period obtained from the wireless communication unit 400.
  • the server 200 performs communication with the wireless communication modem 1, and may include various information for performing manhole management.
  • the user in order to perform the manhole management, the user not only obtains information based on various sensor values transmitted to the server 200, but also the server 200 performs normal operation of the wireless communication modem 1 in order to properly perform manhole management. Includes information to collectively handle the operation.
  • FIG. 3 is a flowchart illustrating a communication operation of a wireless communication modem according to an embodiment
  • FIG. 4 is a flowchart illustrating a communication operation of a wireless communication modem according to another embodiment
  • FIG. It is a flowchart showing the operation control method of a wireless communication modem according to the.
  • FIG. 3 a method of operating a general wireless communication modem 1 has been described. That is, a method of mutual communication between the sensor 51 representing the plurality of sensors 10 to 50 shown in FIG. 1, the wireless communication modem 1, and the server 200 will be described.
  • the first to third sensor values are acquired from the plurality of sensors included in the sensor 51 (1000 to 3000).
  • the sensor 51 corresponds to all the sensors connected to the wireless communication modem 1, and the type and number thereof may be changed.
  • the sensor 51 may include a temperature sensor for measuring a temperature or humidity situation inside the manhole, and a humidity sensor.
  • the sensor value obtained by the sensor 51 may be transmitted in real time to the wireless communication modem (1).
  • the wireless communication modem 1 includes a changeable wireless communication period stored arbitrarily inside the modem 1, so that the wireless communication modem 1 can be kept in a sleep mode regardless of whether a sensor value is obtained from the sensor 51. However, when the sleep mode is released, the wireless communication modem 1 transmits a sensor value to the server 200 by performing wireless communication (4000).
  • the server 200 obtains a sensor value from the wireless communication modem 1 (5000).
  • the wireless communication modem 1 wirelessly transmits the sensor value to the server 200, the wireless communication modem 1 enters the sleep mode again for a predetermined period.
  • the wireless communication modem 1 according to the present invention may change the communication period in which the sleep mode is maintained, as shown in FIG. 4.
  • the main processor 310 of the wireless communication modem 1 according to the present invention performs the wireless communication cycle of the initial wireless communication modem 1 three times a day, that is, every 8 hours. In this case, in order to extend the life of the radio communication modem 1, it is possible to control to change the radio communication cycle once a day, that is, at intervals of 24 hours.
  • FIG. 4 is a diagram for describing a case in which a wireless communication cycle is changed.
  • the sensor 51 obtains sensor values from the plurality of sensors 10 to 50.
  • the sensor 51 may include various sensors, but may acquire a temperature value from a temperature sensor or a humidity value from a humidity sensor in order to determine a temperature and a humidity situation in a manhole (900 to 901).
  • first to third sensor values are acquired from the plurality of sensors included in the sensor 51 (1000 to 3000).
  • the sensor 51 corresponds to all the sensors connected to the wireless communication modem 1, and the type and number thereof may be changed.
  • the sensor value obtained by the sensor 51 may be transmitted in real time to the wireless communication modem (1).
  • the server 200 performing wireless communication with the wireless communication modem 1 according to the present invention obtains weather information from the outside (201).
  • weather information obtained by the server 200 may be transmitted to the wireless communication modem 1.
  • the wireless communication modem 1 predicts the life of the battery 3 of the wireless communication device 1 based on the temperature and humidity inside the manhole received from the sensor 51 and the weather information obtained from the server 200.
  • the wireless communication period may be changed to maintain the expected lifespan.
  • the wireless communication modem 1 may change the wireless communication period in order to reduce the consumption of the current used to transmit the sensor value obtained from the sensor 51 to the server 200 through wireless communication.
  • the wireless communication modem 1 when the wireless communication period is extended, the wireless communication modem 1 is operated in the sleep mode, and when the sleep mode is released, that is, when the wireless communication period is reached, the sensor value is wirelessly transmitted to the server (4000). Accordingly, the server 200 acquires a sensor value (5000), and the wireless communication modem 1 operates in the sleep mode again.
  • the lifespan of the battery 3 in the wireless modem 1 is predicted by the wireless modem 1 itself, but according to another embodiment according to FIG. 1)
  • the life of the battery 3 may be predicted, the corresponding life information may be obtained, and the cycle may be changed accordingly.
  • a temperature value is obtained from a temperature sensor
  • a humidity value is obtained from a humidity sensor
  • first to third sensor values are obtained from a plurality of other sensors (900, 901, and 1000). To 3000).
  • the sensor value obtained by the sensor 51 may be transmitted in real time to the wireless communication modem (1).
  • the wireless communication modem 1 wirelessly transmits the acquired sensor value to the server when the sleep mode is completed (4000). Therefore, the server 200 predicts the battery 3 life of the wireless communication modem 1 based on the weather information 201 obtained in advance and the sensor value obtained from the wireless communication modem 1 (202). Thereafter, the wireless communication modem 1 obtains the battery 3 life information of the predicted wireless communication modem (203).
  • the wireless communication modem 1 may change the communication cycle of the wireless communication modem based on the obtained battery life information (204), and then transmit the sensor value back to the server when the changed communication cycle is completed (205). Accordingly, the server 200 obtains the sensor value (206), and the wireless communication modem 1 is again operated in the sleep mode.
  • FIG. 6 is a flowchart for explaining an embodiment in which a communication cycle of a wireless communication modem at the time of detecting an abnormal situation inside a manhole is changed based on a sensor value acquired through the sensor 51.
  • the wireless communication modem 1 receives a sensor value from a sensor (6000).
  • the input sensor value may be a sensor value of a plurality of sensors connected to the wireless communication modem 1.
  • the wireless communication modem 1 shortens the wireless communication period in which it communicates with the server 200 ( 6000). Accordingly, the server 200 may quickly acquire a situation inside the manhole so that a user who manages the server 200 may quickly grasp a dangerous situation.
  • the wireless communication modem 1 extends the wireless communication period again in communication with the server 200 (6040).
  • the wireless communication modem 1 may be controlled to use a long life of the battery by reducing the amount of current consumed by performing wireless communication.

Abstract

L'invention concerne un modem de communication sans fil et un procédé de commande associé. Le modem de communication sans fil selon un mode de réalisation comprend : une batterie, permettant de fournir de l'énergie pour une communication sans fil ; une unité de communication sans fil, permettant de communiquer sans fil ; et une unité de commande électronique, permettant de recevoir des entrées de signaux de mesure provenant de capteurs installés à l'intérieur d'un trou d'homme, de déterminer un intervalle de communication sans fil en fonction de la durée de vie de la batterie et de communiquer sans fil, dans l'intervalle déterminé de communication sans fil.
PCT/KR2017/005424 2017-05-24 2017-05-24 Modem de communication sans fil et procédé de commande associé WO2018216831A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020170063917A KR20180128599A (ko) 2017-05-24 2017-05-24 무선 통신 모뎀 및 무선 통신 모뎀 제어 방법
KR10-2017-0063917 2017-05-24

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WO2018216831A1 true WO2018216831A1 (fr) 2018-11-29

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WO (1) WO2018216831A1 (fr)

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KR102379083B1 (ko) * 2019-06-27 2022-03-24 삼성중공업 주식회사 선박용 화물탱크 감시시스템
KR20230145764A (ko) 2022-04-11 2023-10-18 아이티엘(주) NB-IoT 무선 프로토콜을 이용한 범용 LPWA 무선 모뎀 단말기

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KR100874343B1 (ko) * 2006-02-28 2008-12-17 한국전력공사 맨홀 감시용 무선시스템
US20110066297A1 (en) * 2008-05-20 2011-03-17 LiveMeters, Inc. Remote monitoring and control system comprising mesh and time synchronization technology
KR20110035890A (ko) * 2009-09-30 2011-04-06 한국전자통신연구원 위치 측정 방법
KR20120091486A (ko) * 2010-12-22 2012-08-20 한국전자통신연구원 사물통신 디바이스의 배터리 수명 모니터링 장치 및 방법
KR20160034732A (ko) * 2014-09-22 2016-03-30 주식회사 케이티 사물인터넷 시스템 및 그 시스템의 센서 노드의 배터리 교체 방법

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Publication number Priority date Publication date Assignee Title
KR100874343B1 (ko) * 2006-02-28 2008-12-17 한국전력공사 맨홀 감시용 무선시스템
US20110066297A1 (en) * 2008-05-20 2011-03-17 LiveMeters, Inc. Remote monitoring and control system comprising mesh and time synchronization technology
KR20110035890A (ko) * 2009-09-30 2011-04-06 한국전자통신연구원 위치 측정 방법
KR20120091486A (ko) * 2010-12-22 2012-08-20 한국전자통신연구원 사물통신 디바이스의 배터리 수명 모니터링 장치 및 방법
KR20160034732A (ko) * 2014-09-22 2016-03-30 주식회사 케이티 사물인터넷 시스템 및 그 시스템의 센서 노드의 배터리 교체 방법

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