WO2016085141A1

WO2016085141A1 - Power state-based train monitoring device and monitoring method

Info

Publication number: WO2016085141A1
Application number: PCT/KR2015/011571
Authority: WO
Inventors: 김영일; 류원; 박대근; 여건민; 이용태; 임선화
Original assignee: 한국전자통신연구원
Priority date: 2014-11-24
Filing date: 2015-10-30
Publication date: 2016-06-02

Abstract

A power state-based train monitoring device according to the present invention comprises: one or more wireless sensor units for periodically measuring an operation state of a train and generating sensor data; one or more autonomous power supply units for generating power by using vibration energy of the train, supplying the generated power to the wireless sensor units, monitoring the generated power, and transmitting power state information to a communication control unit; and the communication control unit for controlling the configuration of wireless links of the wireless sensor units on the basis of the power state information so as to allocate any one of a dedicated channel and a contention channel thereto, and transmitting sensor data, which are received from the wireless sensor units, to an external communication network.

Description

Power state based train monitoring device and monitoring method

The present invention relates to a wireless sensor network for measuring the operating state of a device constituting a train for the purpose of safe driving of a train, and more particularly, to the operation control of a train monitoring wireless sensor network utilizing energy harvesting technology. Technology.

As a method for safe operation of trains, a wireless sensor network for monitoring trains that can detect the real-time operation of the devices that make up a railway vehicle in real time and maintain the vehicle immediately in the event of an abnormal condition. Is being used. As such, the Wireless Sensor Network, which transmits the operating status information of railroad cars in real time for the safe operation of the train, utilizes energy harvester technology to utilize vibration energy of the train without using an external power source. It is being developed in the form of using power generated by utilizing.

However, in the energy harvester technology using the vibration energy of the train, since the power generated by the operating state of the train may change, it is necessary to secure a stable power supply. In order to secure a stable power supply, a method of using a super capacitor in a power generator is being used. However, such a method also causes a charge and discharge due to an imbalance between the generated power and the power consumed by the communication module of the wireless sensor, thereby causing a problem that the link quality of the wireless sensor is degraded. In particular, when the wireless link is disconnected due to lack of power while the wireless sensor is in operation, the link setup procedure must be performed again between the wireless sensor and the coordinator when the power is returned to the communicable level. Etc., resulting in deterioration in communication quality.

Republic of Korea Patent No. 10-0877587 discloses a technology for detecting the vibration and the location of the vibration generated during the operation of the high-speed train vehicle to deliver to the command room server, but only discloses the information to deliver the detected information through wireless transmission However, there is no disclosure for solving the problem of the stable power supply problem or the communication quality deterioration accordingly.

The problem to be solved by the present invention is to provide a power state based train monitoring apparatus and method that can prevent the degradation of communication quality due to irregular power production in a wireless sensor network for monitoring trains combined with energy harvester technology.

Power state-based train monitoring apparatus according to the present invention generates at least one wireless sensor unit for generating sensor data by periodically measuring the operating state of the train, generating power by using the vibration energy of the train and the generated power to the wireless sensor One or more of a dedicated channel and a competitive channel by controlling the configuration of a wireless link of the wireless sensor unit based on one or more autonomous power supply unit and power state information that supplies power to the unit and monitors the generated power and transmits the power state information to the communication control unit. And a communication control unit for transmitting the sensor data received from the wireless sensor unit to an external communication network.

The communication control unit configures a super frame by allocating a channel and a transmission period of the wireless sensor unit based on the power state information. The communication controller determines whether the power state of the wireless sensor unit reaches a threshold for changing a wireless link setting method based on the power state information. In addition, the communication controller allocates a contention channel to one of the one or more wireless sensor units having a power state equal to or greater than a method selection threshold. In addition, the communication control unit allocates a dedicated channel to the wireless sensor unit having a power supply state of less than a method selection threshold value among the one or more wireless sensor units. In addition, the communication control unit allocates a dedicated channel in an extended transmission period of the wireless sensor unit to give a power charging time to the wireless sensor unit having a power state below the transmission cycle extension threshold value among the wireless sensor units whose power state is less than the method selection threshold. (Sampling Frequency) can be changed.

Train monitoring method using the power state-based train monitoring device according to the present invention generates power using the vibration energy of the train and at least one wireless sensor for generating sensor data by periodically measuring the operating state of the train generated power Pass in wealth. Then, the wireless link unit controls the configuration of the wireless link based on the power state information and allocates any one of a dedicated channel and a contention channel. Next, the sensor data received from the wireless sensor unit is transferred to the external communication network.

The step of assigning any one of a dedicated channel and a contention channel allocates a contention channel to a wireless sensor unit having a power state equal to or greater than a method selection threshold value among one or more wireless sensor units. In the step of assigning any one of the dedicated channel and the contention channel, the dedicated channel is allocated to the wireless sensor unit having a power state below the method selection threshold value among the one or more wireless sensor units. In addition, the step of assigning any one of the dedicated channel and the contention channel may be performed by the wireless sensor unit in order to give a power charging time to the wireless sensor unit having a power state below the transmission period extension threshold value among the wireless sensor units whose power state is less than the method selection threshold. The sensing frequency may be changed by allocating a dedicated channel as an extension transmission period.

Power state-based train monitoring apparatus and method according to the present invention is a wireless sensor based on the state of the generated power source of the wireless sensor in the railway wireless sensor network to obtain a driving state in real time through a sensor mounted on the running portion of the railway car By changing the wireless link setting mode of the network, the transmission quality and operation period of the wireless sensor can be improved. In addition, by managing the power state of the wireless sensor in the wireless sensor network, it is possible to prevent unnecessary operation of the wireless sensor to generate energy waste and interference signals.

1A and 1B are diagrams illustrating a power state based train monitoring apparatus 100 according to an embodiment of the present invention.

2 is a detailed view of the communication control unit 200 of the power state-based train monitoring apparatus according to an embodiment of the present invention.

3 is a block diagram of a superframe of the communication control unit 200 according to an embodiment of the present invention.

4 is a configuration diagram of another embodiment of the power state-based train monitoring apparatus 400 according to the present invention.

5 is a configuration diagram of a format of power state information of the power state-based train monitoring apparatus 100 according to an embodiment of the present invention.

6 is a configuration diagram of another format of power state information of the power state-based train monitoring apparatus 100 according to an embodiment of the present invention.

7 is a flowchart illustrating a method for autonomous configuration of a radio link of a power state-based train monitoring apparatus according to an embodiment of the present invention.

8 is a flowchart illustrating an operation procedure of a sensor node of a method for autonomous configuration of a radio link according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Terms and words used herein are terms selected in consideration of functions in the embodiments, and the meaning of the terms may vary according to the intention or custom of the invention. Therefore, the terminology used in the embodiments to be described later, according to the definition when specifically defined in the present specification, if there is no specific definition should be interpreted as meaning generally recognized by those skilled in the art.

1A and 1B, the power state-based train monitoring apparatus 100 according to the present invention is installed in a running train and monitors a driving state of a train and transmits it to the sensor monitoring center 10. In addition, the power state-based train monitoring apparatus 100 according to the present invention generates a power from the vibration energy generated by the operation of the train through the energy harvester technology to operate the sensor for monitoring the state of the train. Power state-based train monitoring device 100 according to the present invention includes one or more wireless sensor unit 110, one or more autonomous power supply unit 120 and the communication control unit 130.

The wireless sensor unit 110 is configured as a sensor capable of measuring temperature and vibration, and generates sensor data by measuring heat and vibration generated in a plurality of bearings on a bogie shaft of a train. In addition, the wireless sensor unit 110 transmits the sensor data measured according to the radio link configuration set by the communication control unit 130 to the communication control unit 130. As an example of communication between the wireless sensor unit 110 and the communication control unit 130, a wireless sensor network connection method of the IEEE 802.15.4 method, which is a low-power low-speed short-range wireless communication standard such as Zigbee communication, may be used.

The autonomous power supply unit 120 generates (produces) electric power using vibration energy generated from a running train. Trains generate a lot of vibration during operation. The autonomous power supply unit 120 may generate power from such vibration through piezoelectric energy technology.

In addition, the autonomous power supply unit 120 monitors power generated by power and / or vibration energy supplied to the wireless sensor unit. Since the train does not always run at the same speed and acceleration, the power generated by the autonomous power supply unit 120 varies according to the running acceleration of the train. Therefore, in the present invention, the autonomous power supply 120 continuously monitors the power state to generate power state information so that the wireless link of the wireless sensor unit 110 can be configured in consideration of the generated power state. The power state information includes information on the amount of power and the amount of change generated by the autonomous power supply 120. The autonomous power supply unit 120 transmits the generated power state information to the communication control unit 130. In addition, the autonomous power supply unit 120 may supply the generated power to the wireless sensor unit 110 to operate the wireless sensor unit 110.

The communication controller 130 configures a wireless sensor network (WSN) through at least one wireless sensor unit 110 and a wireless link. In this process, the communication control unit 130 configures a wireless link of the wireless sensor unit 110 based on the power state information received from the autonomous power supply unit 120, and from the wireless sensor unit 110 through the configured wireless link. Receive sensor data.

The power state information includes information on the amount of power generated by the autonomous power supply 120 and the amount of change thereof. Since the autonomous power supply unit 120 uses the energy harvester technology to produce power by using vibration energy according to the operation of the train, the power output is changed according to the acceleration of the train. Therefore, the communication control unit 130 determines the state of the power produced by the autonomous power supply unit 120 based on the power state information, and thus configures and changes the wireless link of the wireless sensor unit 110. In addition, the communication control unit 130 changes the measurement period of the wireless sensor unit 110.

The communication controller 130 may be configured with a gateway 131 and one or more coordinators 132 for establishing a wireless sensor network. The one or more coordinators 132 establishes a wireless link of the wireless sensor unit 110 based on the power state information, collects sensor data from the wireless sensor unit 110, and transmits the sensor data to the gateway 131. The coordinator 132 may deliver sensor data directly to the gateway 131, or may transmit sensor data to the gateway 131 via a coordinator 132 located at another level or adjacent to each other. The gateway 131 transfers sensor data received from the one or more coordinators 132 to the sensor monitoring center 10. The one or more wireless sensor units 110 are connected to the coordinator 131 having a good radio wave strength among the one or more coordinators 131.

As a communication method between one or more coordinators 132 and a communication method between the coordinator 131 and the wireless sensor unit 110, various wireless communication methods may be used, and short-range wireless communication standards such as Zigbee communication (IEEE 802.15) .4) or a wireless LAN standard (IEEE 802.11) such as Wi-Fi may be used. In addition, a mobile communication network may be used as the communication method between the gateway 131 and the sensor monitoring center 10.

One or more wireless sensor unit 110 may be located on or around the chassis axis of the train to measure heat and vibration, one or more autonomous power supply unit 120 is also located around the chassis axis of the train to provide power Can produce. In addition, the wireless sensor unit 110 operates by the power produced by the autonomous power supply unit 120. In addition, one wireless sensor unit 110 and one autonomous power supply unit 120 operating in the same chassis axis may operate in a pair.

That is, the communication controller 130 may control the wireless sensor unit 110 and the power supply unit 120 located around the same chassis axis as one pair. For example, in the case of the first wireless sensor unit 111 and the first power supply unit 121, the communication control unit 130 is based on the power state information of the first power supply unit 121. ) Can set radio link and measurement period.

The communication controller 130 may perform the following functions to reduce power consumption of the wireless sensor unit 110, which is a low power wireless sensor, when the amount of power is reduced in consideration of the amount of power produced according to the power state information. The communication controller 130 allocates a dedicated channel to the wireless sensor unit 110 that transmits sensor data at regular intervals. When the power state of the wireless sensor unit 110 having a small amount of sensor data or a long transmission period is good, the contention mode channel is allocated. The communication control unit 130 sets the channel mode conversion to prevent the wireless sensor unit 110 having a poor power state from occupying the dedicated channel for a long time.

In addition, the communication control unit 130 determines the period of the superframe based on the power level of the wireless sensor unit 110 and estimates the power charging time of the sensor node to determine the time to maintain the dedicated channel allocation. If the wireless sensor unit 110 having a very bad power state is identified, the communication controller 130 releases the dedicated channel assignment mode for the wireless sensor unit 110. When the power state returns to a very good level, the communication control unit 130 sets a contention channel link (CSMA-CA) scheme for the corresponding wireless sensor unit 110. A detailed method of setting up a wireless link in the communication control unit 130 will be described later in detail.

In addition, the communication controller 130 may vary the sensing frequency of the wireless sensor unit 110 in consideration of the power state of the wireless sensor unit 110 based on the power state information. If the power state of the wireless sensor unit 110 is not greater than the transmission period extension threshold based on the power state information, the communication control unit 130 determines that the power state-based train monitoring apparatus cannot communicate with the current power state. In order to give the wireless sensor unit 110 a power charging time, a dedicated channel is allocated to an extended transmission period of varying a sensing frequency. The extended transmission period means a transmission period in which the transmission period is longer than the basic transmission period.

2, the communication control unit 200 of the power state-based train monitoring apparatus according to an embodiment of the present invention is a radio link connection method determination application layer 210, MAC layer 220 and physical layer 230 It may be configured as. In addition, the radio link access method determination application layer 210 may include a power state management unit 211, a super frame component 212, and a radio access method determination unit 213 for each wireless sensor.

The power state management unit 211 for each wireless sensor determines the state of the power produced by each autonomous power supply unit 120 (power state of the wireless sensor unit) based on power state information received from each of the one or more autonomous power supply units 120. Figure out. The wireless sensor power state manager 211 determines the channel link of the wireless sensor unit 110 according to the power state. The radio link is composed of a contention access period (CAP) and a contention free period (CFP) based on non-competition. The CAP section is a contention channel link section, and is accompanied by an increase in power consumption and transmission delay of the wireless sensor unit 110 using a carrier sense multiple access-collision avoidance (CSMA-CA) scheme. In addition, the CFP section is a dedicated channel link section and has an advantage in that it can be driven with low power when data is always transmitted at a constant cycle.

The power state management unit 211 for each wireless sensor determines one channel link among dedicated channel links (GTs) and contention channel links (CSMA-CA) according to the power state of each wireless sensor unit 110. The power state management unit 211 for each wireless sensor may allocate a contention-based channel (competition channel link) in one of the wireless sensor units when it is determined that the power state is sufficient. On the other hand, the power state management unit 211 for each wireless sensor, if it is determined that the power state is not sufficient in any one of the wireless sensor unit may allocate a dedicated channel link, and adjust the transmission period according to the power state.

The super frame configuration unit 212 configures the super frame of the wireless sensor unit 110 according to the channel link and the period determined by the power state management unit 211 for each wireless sensor. The superframe component 212 transmits the superframe to the corresponding wireless sensor unit 110. The structure of the superframe is further described in FIG. 3 to be described later.

The wireless connection method determination unit 213 determines the wireless connection method based on the determination of the power state management unit 211 and the superframe component 212 for each wireless sensor.

1B and 3, the communication controller 130 configures a super frame 310 corresponding to each wireless sensor unit 110 according to a channel link and a period determined based on power state information. The radio link is composed of a contention access period (CAP) based on contention and a contention free period (CFP) based on a contention free.

The competition channel section (CAP) is accompanied by an increase in power consumption and transmission delay of the wireless sensor unit 110 using a carrier sense multiple access-collision avoidance (CSMA-CA) scheme. In addition, the dedicated channel section (CFP) has the advantage that can be driven at low power when transmitting data at regular intervals at all times. That is, in the wireless link of the wireless sensor unit 110, the contention channel section is allocated when the power is higher than or equal to a predetermined method selection threshold (if sufficient). When the power is less than the preset threshold (when the power is insufficient), the dedicated channel section (CFP) may be allocated by adjusting the period. The super frame consists of an operation section (CAP + CFP) for performing communication between the wireless sensor unit 110 and the coordinator 132 of the communication control unit 130 and a rest period in which the wireless sensor unit 110 does not operate. It has a configuration suitable for sensor networks. When using the dedicated channel section (CFP), each wireless sensor unit 110 is assigned a dedicated channel (slot) and transmits the sensor data to the coordinator 132.

FIG. 2 illustrates an example of a case where the power supply level of the first sensor # 1 is low when waiting for a time for charging power. Accordingly, in the example of FIG. 2, when the first sensor # 1 of the wireless sensor unit 110 transmits sensor data over two super frames in the dedicated link section 312, the basic transmission period between the same dedicated channel slots is used. In addition, data is transmitted after the extended transmission period is added.

Referring to FIG. 4, the power state-based train monitoring apparatus 400 according to the present invention includes one or more sensor nodes 410 and a communication controller 420. The sensor node 410 includes a pair of wireless sensor units 411, an autonomous power supply unit 412, and a wireless communication unit 413 for connecting a wireless link with the wireless communication unit 413. The number of sensor nodes 410 may be freely set, and for example, may be installed as many as the chassis shafts of a train. In FIG. 4, only one sensor node 410 is shown for convenience of description.

One wireless sensor unit 411 and one autonomous power supply unit 412 constitute a pair, and a wireless link is connected to the communication control unit 440 through the wireless communication unit 430. In addition, the wireless sensor unit 411 and the autonomous power supply unit 412 may be connected to the wireless communication unit 413 through a wired connection (direct connection).

The wireless sensor unit 411 operates through the power supplied from the autonomous power supply unit 412, generates sensor data by measuring temperature and vibration of the chassis axis, and generates the sensor data through the wireless communication unit 413. Forward to 420. In addition, the autonomous power supply unit 412 uses the vibration energy generated by the movement of the train to produce power and supply the power to the wireless sensor unit 411. In addition, the autonomous power supply unit 412 monitors the generated power to generate power state information, and transmits the power state information to the communication control unit 420 through the wireless communication unit 413.

Sensor data received from the wireless sensor unit 411 and power state information received from the autonomous power supply unit 412 are transmitted to the communication control unit 430 through the wireless communication unit 413. The communication controller 430 may determine the power state of the wireless sensor unit 411 based on the received power state information, may allocate a channel corresponding to the wireless sensor unit 411, and set a transmission period in consideration of this. . The wireless communication unit 413 transmits sensor data of the wireless sensor unit 411 to the communication control unit 420 through a wireless link configured by the communication control unit 420.

1A and 5, FIG. 5 shows power state information based on a MAC management message of the IEEE 802.15.4 standard, which is a short range wireless communication standard. In the present invention, the communication control unit 130 or the coordinator 131 of the communication control unit 130 in order to obtain the power state information (power supply state) of the wireless sensor unit 110 to manage the existing MAC of IEEE 802.15.4 By adding a 'Power Status Request' and a 'Power Status Response' message to the message, the coordinator 131 is connected to the autonomous power supply 120 of FIG. 1A or the sensor node 410 of FIG. 4. Request power status information (power status request). In addition, the autonomous power supply unit 120 or the sensor node 410 transmits a power state response to the communication control unit 130 in response to the power state request. In the case of the power status request message, the payload 510 includes the number of grades between the minimum power level, the maximum power level, and the maximum and minimum power levels.

1 and 6, the power state information of FIG. 6 is a data frame in a process in which the sensor node 410 or the autonomous power supply unit 120 transmits the power state information to the communication control unit 130 or the coordinator 131. It shows the case of using. The method using the data frame format allows the sensor node 410 to simultaneously transmit the sensor data and power state information in the form of piggyback. To this end, the power supply status information is designated with a data type and includes a field indicating piggyback status information. This approach may be suitable for transmitting sensor data at regular intervals.

In the present invention, the coordinator 131 sends a power state request message to the sensor node 410 or the autonomous power supply 120 through the MAC management message to manage the power state of the sensor node 410 or the autonomous power supply 120. I can deliver it. At this time, the coordinator 131 may designate the power state of the power state request messaging

wireless sensor unit

110 and 411 as a minimum value, a maximum value, and a grade level.

In addition, the sensor node 410 or the autonomous power supply unit 120 that receives the power state request message from the coordinator 131 transmits the power state information including the power class information classified by the class using a data frame. 420 or the coordinator 131.

Referring to FIG. 7, in the method for autonomous configuration of a radio link of a power monitoring apparatus based on power state, first, power state information is collected (S701), and the power state of the wireless sensor unit is checked (S702). The present invention uses the vibration energy generated by the operation of the train to produce power to operate the wireless sensor unit. However, since the state of the power produced by the change in the acceleration of the train also changes from time to time, it may affect the operation of the wireless sensor unit and the performance of the wireless link. In the present invention, the wireless link is configured based on the power state of the wireless sensor unit identified through the power state information.

When the power state of the wireless sensor unit is confirmed, the power state-based train monitoring apparatus compares the power state with the method selection threshold, and determines whether the power state is less than the method selection threshold (S703). The method selection threshold is a reference value for distinguishing a competition channel and a dedicated channel. The power state-based train monitoring apparatus compares the power state of the wireless sensor unit with a method selection threshold to determine whether the power state of the corresponding wireless sensor unit reaches a threshold that can change the radio link setting method. The power state-based train monitoring apparatus determines that the power state of the wireless sensor unit reaches a sufficient level (when sufficient power is available) when the power state of the wireless sensor unit is not smaller than a predetermined method selection threshold (large). By assigning the contention channel (CAP) of the wireless sensor unit (S704). The contention channel is suitable for a wireless sensor unit in which the power level is large enough or does not need to transmit sensor data periodically.

On the other hand, when the comparison result of step S703, when the power state of the wireless sensor unit is less than the predetermined method selection threshold, the power state-based train monitoring device determines that the power state has reached the threshold. In addition, the power state-based train monitoring apparatus determines whether to increase the transmission period of the wireless sensor unit by comparing the power state of the wireless sensor unit with the transmission period extension threshold (S705). If the power state of the wireless sensor unit is not greater than the transmission period extension threshold (hereinafter, referred to as the following), the power state-based train monitoring device determines that communication is not possible with the current power state, and gives a power charging time to the wireless sensor unit. In order to allocate the dedicated channel in the extended transmission period (S706). The extended transmission period means a transmission period in which the transmission period is longer than the basic transmission period.

In step S705, if the power state of the wireless sensor unit is larger than the transmission period extension threshold, it is determined that communication is possible in the current power state, and the power state-based train monitoring apparatus allocates a dedicated channel basic transmission period (S707). . The power state-based train monitoring apparatus configures a super frame according to the allocated channel through steps S704, S706, and S707 (S708). The configured super frame is transmitted to the wireless sensor unit or the sensor node to form a radio link between the wireless sensor unit and the communication control unit.

Referring to FIG. 8, the autonomous wireless link configuration method according to the present invention may solve the power state problem of the wireless sensor unit by using a method of changing a sensing frequency of the wireless sensor unit based on a power state. The power state-based train monitoring apparatus collects power state information (S801) and checks the power state of the wireless sensor unit (S802). In addition, the power state-based train monitoring apparatus compares the power state with the communicable threshold to determine whether the power state of the wireless sensor unit exceeds the communicable threshold (S803). The communicable threshold indicates the minimum amount of power that the wireless sensor can deliver communication to. If the power state is not greater than the communicable threshold, the power state-based train monitoring apparatus determines that communication is impossible and enters the wireless sensor unit in hibernate mode (S804). The wireless sensor unit, which has entered hibernation mode, waits until the power supply state is good.

In operation S803, when the power state exceeds the communicable threshold value, the power state-based train monitoring apparatus compares the power state and the sampling threshold to determine whether the power state exceeds the sampling threshold (S805). The sampling threshold value represents a threshold value of a sensing frequency at which the wireless sensor unit measures a train state. The power state-based train monitoring apparatus may compare the power state and the sampling threshold to determine whether the communication is unstable.

If the power state is less than the sampling threshold in step S805, the power state-based train monitoring device determines that the power state of the wireless sensor unit is in communication but unstable, and reduces the measurement speed of the wireless sensor unit (S806). ). Then, the power state-based train monitoring device proceeds to the sensor data transmission procedure (S807). If the power state exceeds the sampling threshold in step S805, the power state-based train monitoring apparatus determines that the power state is in communication and is not an unstable state and proceeds with the sensor data transmission procedure without changing the sampling rate.

The method of autonomous configuration of a radio link of the power state-based train monitoring apparatus disclosed in FIGS. 7 and 8 is performed separately for each of one or more wireless sensor units or one or more sensor nodes constituting the power state-based train monitoring apparatus. Through this, in the present invention, by configuring a wireless link with the individual wireless sensor unit according to the power state of the individual wireless sensor unit, it is possible to prevent the degradation of communication quality by actively responding to the power state change.

The present invention including the above-described contents can be produced by a computer program. And code and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the written program may be stored in a computer-readable recording medium or information storage medium, and read and executed by a computer to implement the method of the present invention. The recording medium may include any type of computer readable recording medium.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. It is possible.

Claims

At least one wireless sensor unit measuring sensor operating states at predetermined intervals to generate sensor data;

At least one autonomous power supply unit generating power by using vibration energy of a train, supplying the generated power to the wireless sensor unit, and monitoring power supplied to deliver power state information generated to a communication controller; And

A communication control unit controlling a configuration of a radio link to allocate one of a dedicated channel and a contention channel to the wireless sensor unit based on the power state information;

Power state based train monitoring device comprising a.
The method of claim 1,

The communication control unit,

Power state based train monitoring apparatus, characterized in that for configuring the super frame by allocating the channel and transmission period of the wireless sensor unit based on the power state information.
The method of claim 1,

The communication control unit,

The power state-based train monitoring apparatus, characterized in that for determining whether the power state of the wireless sensor unit has reached a threshold value for changing the radio link setting method based on the power state information.
The method of claim 3,

The communication control unit,

The power state-based train monitoring apparatus, characterized in that for allocating a contention channel to the wireless sensor unit of the power state of the at least one of the one or more wireless sensor unit.
The method of claim 3,

The communication control unit,

The power state-based train monitoring apparatus, characterized in that for assigning a dedicated channel in the wireless sensor unit of the power state of the one or more wireless sensor unit less than the method selection threshold value.
The method of claim 4, wherein

The communication control unit,

In order to give power charging time to the wireless sensor unit whose power state is lower than the transmission cycle extension threshold among the wireless sensor units whose power state is lower than the threshold value, the dedicated channel is allocated to the extended transmission cycle of the wireless sensor unit to set the sensing frequency. Power state based train monitoring device, characterized in that variable.
The method of claim 1,

The communication control unit transmits a power state request message for a minimum value, a maximum value, and a class level of a power state through a MAC management message.

And the autonomous power supply unit transmits power state information including power class information classified for each class using a data frame to a communication controller based on the received power state request message.
The method of claim 1,

The communication control unit is a power state based train monitoring device, characterized in that for transmitting the sensor data received from the wireless sensor unit to an external communication network.
In a train monitoring method using a power monitoring system based on power state,

Supplying power generated by using vibration energy of a train to the wireless sensor unit and generating power state information by monitoring power supplied to the wireless sensor unit; And

Allocating any one of a dedicated channel and a contention channel to the wireless sensor unit based on the power state information;

Power state based train monitoring method comprising a.
The method of claim 9,

Allocating any one of the dedicated channel and the competition channel,

A power state-based train monitoring method comprising assigning a contention channel to a wireless sensor unit having a power state equal to or greater than a method selection threshold value among the one or more wireless sensor units.
The method of claim 9,

Allocating any one of the dedicated channel and the competition channel,

Power state-based train monitoring method, characterized in that for assigning a dedicated channel in the wireless sensor unit of the power state is less than the threshold value selection threshold of the at least one wireless sensor unit.
The method of claim 9,

Allocating any one of the dedicated channel and the competition channel,

In order to give power charging time to the wireless sensor unit whose power state is lower than the transmission cycle extension threshold among the wireless sensor units whose power state is lower than the threshold value, the dedicated channel is allocated to the extended transmission cycle of the wireless sensor unit to set the sensing frequency. Power state based train monitoring method characterized in that the variable.