JP2012016989A - Train radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a train radio communication system that certainly performs communication also in a train which performs high-speed traveling by installing a plurality of sets of intensive radio devices in the train and furthermore, and measures communication quality in consideration of train speed.SOLUTION: Communication is ensured also in the train which performs high-speed traveling by receiving a radio packet 6 which a terminal radio device 3 transmits, with a plurality of sets of intensive radio devices 4-a and 4-b installed in different positions in the trains 1. Further a data processing device 5 detects deterioration of communication quality with the number of received radio packets 6.

Description

  The present invention relates to a train radio system that is applied to a transportation system that transports vehicles by moving on a track such as a railroad, a monorail, a guide rail type railroad, and a new transportation system.

  Conventionally, the work of inspecting the state of railway electrical equipment installed along railway lines, such as feeders, tension adjusting devices, pole transformers, etc., has been conducted manually by dispatching inspectors and patrolmen to various places. Yes. These railway electrical equipment breakdowns have a serious impact on the train operation, and periodic inspection work is necessary. However, because the railway electrical equipment is installed in a wide area, a great deal of labor and cost are required. I needed it.

  Therefore, in recent years, in order to reduce the inspection work of railway electrical equipment, a system has been proposed that collects the status of railway electrical equipment by train rather than dispatching inspectors and patrolmen to various places to perform manual inspection work. ing. Specifically, a system in which an aggregated radio device mounted on a train transmits a data request signal at a fixed period, and a terminal radio device that has received the data request signal responds to the aggregated radio device with a radio packet including the state of railway electrical equipment and so on. (For example, see Patent Document 1)

  In these systems, from the viewpoint of low power consumption and effective use of frequency, a method using low-power radio, weak radio, and short-range radio communication represented by ZigBee is widely used.

  However, the communicable distance of short-range wireless communication is about 30 to 100 m, and a train traveling at high speed passes through the communicable area in a few seconds. Even when such short-range wireless communication is used, a system that reliably collects the state of railway electrical equipment by train is required. (First issue)

  In addition, it is conceivable that the communication quality deteriorates due to interference of a wireless LAN or the like, or a change in radio wave propagation characteristics due to construction of a building or the like. Thus, a system that constantly measures the reception state has been proposed (see, for example, Patent Document 2). In this patent document 2, the aggregation wireless device mounted on the train measures the reception state when receiving the wireless packet from the terminal wireless device, and if the reception state deteriorates from a certain value, the reception state deterioration is notified to the user. It is a notification system.

  However, in Patent Document 2, the train speed is not considered when measuring the reception state. For example, when the train moves at a high speed (for example, 100 km / h or more) and when the train moves at a low speed (for example, 40 km / h), the reception state often deteriorates due to the influence of fading or the like. Therefore, when the reception state of a train moving at a low speed is used as a reference, there is a problem in that it is erroneously determined that the reception state has deteriorated due to fading or the like if the train moves faster than the normal speed. (Second problem)

Japanese Patent Laid-Open No. 11-078884 JP 2009-012489 A

  The present invention is an invention made in order to solve the above-mentioned problem, and the first problem is to reliably communicate even in a high-speed traveling train, and to perform communication quality measurement in consideration of the train speed. Let it be the 2nd subject.

  As means for solving the first problem, train radio communication for reliably receiving radio packets by receiving radio packets transmitted by the terminal radio apparatus by a plurality of central radio apparatuses mounted at different positions of the train A system is proposed. At this time, if a plurality of aggregated wireless devices receive the same data wireless packet, one of the data is discarded.

  Also, as a means for solving the second problem, when the expected value of the number of radio packets received by the aggregated radio device is calculated from the transmission cycle of the terminal radio device and the train speed, and the actual number of received packets falls below the expected value Proposes a train radio communication system that determines that the communication quality has deteriorated and notifies the user.

  As described above, according to the present invention, communication can be reliably performed even in a train traveling at high speed. Further, by considering the train speed, it becomes possible to grasp the deterioration of the communication quality with high accuracy.

It is a lineblock diagram of a train radio system in Example 1 of the present invention. It is a block diagram of the terminal radio | wireless apparatus in the said Example 1. FIG. It is a block diagram of the aggregation radio | wireless apparatus in the said Example 1. FIG. It is a block diagram of the data processor in the said Example 1. FIG. It is a block diagram of the radio | wireless packet in the said Example 1. FIG. It is a block diagram of the packet reception notification signal in the first embodiment. It is a sequence diagram explaining operation | movement of the control part in the said Example 1. FIG. It is a sequence diagram explaining operation | movement of the control part in the said Example 1. FIG. It is a sequence diagram explaining operation | movement of the control part in the said Example 1. FIG. It is a block diagram of the train radio system in Example 2 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Configuration of Embodiment 1>
First, Example 1 will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram of the train radio system according to the first embodiment.

(Railway electrical equipment)
The railway electrical equipment 2 is equipment related to railway operations such as feeders, tension adjusting devices, and pole transformers, and is installed along the railway.

(train)
The train 1 is a vehicle that travels on the track. In the first embodiment, the train 1 travels periodically to collect the state of the railway electrical equipment 2.

(Terminal wireless device)
The terminal wireless device 3 has a function of measuring the state of the railway electrical equipment 2 at a regular cycle and transmitting it to the centralized wireless device 4. Details of the function of the terminal wireless device 3 will be described below.

(Function of terminal wireless device)
The terminal wireless device 3 is installed in the vicinity of the railway electrical facility 2 and measures the state of the railway electrical facility 2 at a measurement cycle (for example, 1 hour cycle) determined using the sensor 206. Here, the measurement item is, for example, temperature data or the amount of spring displacement, but the measurement item and the measurement cycle differ depending on the type of the railway electrical equipment 2.

  In addition, the terminal wireless device 3 transmits the wireless packet 6 including the measurement data 503 measured using the sensor 206 at a constant cycle (for example, a cycle of 2 seconds) regardless of the presence or absence of the aggregation wireless device 4. Here, it is assumed that the transmission cycle of the wireless packet 6 is sufficiently earlier than the measurement cycle.

  Therefore, the measurement data 503 described in the wireless packet 6 is not updated every time the terminal wireless device 3 transmits the wireless packet 6, but the same measurement data 503 is described until the next measurement cycle. It is assumed that the transmitted wireless packet 6 is continuously transmitted.

  The wireless packet 6 is multicast transmitted so that the plurality of aggregate wireless devices 4 can receive the wireless packet 6. Details of the configuration of the terminal wireless device 3 will be described later.

(Packet reception notification signal 12 (transmission cycle setting information))
The transmission cycle setting information 504 is information describing a transmission cycle in which the terminal radio apparatus 3 transmits the radio communication packet 6.

(Aggregate wireless device)
The aggregation wireless device 4 has a function of receiving the wireless packet 6 including the measurement data 503 transmitted by the terminal wireless device 3 and a function of transferring the received wireless packet 6 as the packet reception notification signal 8 to the data processing device 5.

  A plurality of aggregated radio apparatuses 4 are installed in a train 1 and the aggregated radio apparatus 4 receives the radio packet 6 transmitted by the terminal radio apparatus 3. In FIG. 1, as an example of installing a plurality of aggregated radio apparatuses on a train 1, an aggregated radio apparatus 4-a is installed at the frontmost part of the train, and an aggregated radio apparatus 4-b is installed at the rearmost part of the train.

  When receiving the wireless packet 6, the aggregation wireless device 4 notifies the data processing device 5 of a packet reception notification signal 12.

(Packet reception notification signal)
FIG. 6 shows the configuration of the packet reception notification signal 12. As shown in FIG. 6, the packet reception notification signal 12 includes a wireless station ID 501, a measurement number 502, measurement data 503, transmission cycle setting information 504, and the number of received packets 601.

  As described above, the packet reception notification signal 8 is obtained by adding the number of received packets 601 to the wireless station ID 501, the measurement number 502, the measurement data 503, and the transmission cycle setting information 504 described in the wireless packet 6. is there.

(Number of received wireless packets)
Here, the number of received packets 601 describes the total number of received wireless packets 6 from when the aggregated wireless device 4 enters the communicable area with the terminal wireless device 3 and passes through.

(Data processing device)
The data processing apparatus has a function of storing the measurement data 503 in the database 402 without duplication even when a plurality of aggregation wireless apparatuses receive the wireless packet of the same data, and the wireless packet received by the aggregation wireless apparatus Therefore, it has a function of detecting deterioration of communication quality.

  When the data processing apparatus receives the packet reception notification signal 8 notified from the aggregation wireless apparatus 4, the data processing apparatus wirelessly describes the wireless station ID 501 and the measurement number 502 that are already stored in the database 402 in the packet reception notification signal 8. The station ID 501 and the measurement number 502 are respectively compared, and if both the radio station ID 501 and the measurement number 502 are the same, it is determined that the plurality of centralized radio apparatuses 4 have received the wireless packet 6 in which the same measurement data 503 is described. .

  If both the wireless station ID 501 and the measurement number 502 are different from those recorded in the database 402, it is newly recorded in the database 402 as measurement data 503 that has not been stored yet.

  Further, the data processing device 5 calculates the expected value of the number of wireless packets received by the aggregated wireless device 4 from the transmission cycle of the terminal wireless device 3 and the train speed 9, and the actual number of received packets falls below the expected value Determines that the wireless link is degraded and notifies the user.

  The functional flow of the data processing device 5 described above will be described later.

(Configuration of terminal wireless device)
FIG. 2 shows a configuration example of the terminal radio apparatus 3 of the present embodiment. As illustrated in FIG. 2, the terminal wireless device 3 includes a control unit 201, a recording unit 202, a measurement unit 203, a timer 204, a wireless communication unit 205, and a sensor 206. Hereinafter, functions of the control unit 201, the recording unit 202, the measurement unit 203, the timer 204, the wireless communication unit 205, and the sensor 206 will be described.

(Control part)
The control unit 201 of the terminal wireless device 3 has a function of controlling the recording unit 202, the measurement unit 203, the timer 204, the wireless communication unit 205, and the sensor 206. A series of operations of the control unit 201 will be described later.

(Recording part)
The recording unit records the wireless station ID 501, the measurement number 502, and the measurement data 503.

(Measurement part)
The measuring unit 203 of the terminal wireless device 3 has a function of measuring the state of the railway electrical facility 2 using the sensor 206.

(timer)
The timer 204 of the terminal wireless device 3 is used to determine whether it is time to measure the state of the railway electrical facility 2 or time to transmit the wireless packet 6.

(Wireless communication part)
The wireless communication unit 205 of the terminal wireless device 3 has a function of transmitting the wireless packet 6 to the aggregation wireless device 4. Here, the wireless packet 6 is multicast transmitted so that the plurality of aggregation wireless devices 4 can receive the wireless packet 6.

(Sensor)
The sensor 206 of the terminal wireless device 3 is used for measuring the state of the railway electrical facility 2. The sensor 206 used here may be, for example, a temperature sensor or a displacement sensor, that is, it differs depending on the type of the railway electrical equipment 2. In FIG. 2, for convenience, only one sensor 206 is illustrated, but a plurality of sensors 206 may be connected to one terminal wireless device 3.

(Wireless communication part)
The wireless communication unit 205 of the terminal wireless device 3 has a function of transmitting the wireless packet 6. Here, the wireless packet 6 is multicast transmitted so that the plurality of aggregation wireless devices 4 can receive the wireless packet 6.

(cable)
It is assumed that the sensor 206 and the measurement unit 203 are connected by a cable 207. The cable may be wired or wireless.

(Configuration of aggregate radio equipment)
FIG. 3 shows a configuration example of the aggregated radio apparatus 4 of the first embodiment. As shown in FIG. 3, the aggregation wireless device 4 includes a control unit 301, a recording unit 302, an output interface 303, a timer 304, a wireless communication unit 305, and a counter 306. Hereinafter, functions of the control unit 301, the recording unit 302, the output interface 303, the timer 304, the wireless communication unit 305, and the counter 306 will be described.

(Control part)
The control unit 301 of the aggregation wireless device 4 has a function of controlling the recording unit 302, the output interface 303, the timer 304, the wireless communication unit 305, and the counter 306. A series of operations of the control unit 301 will be described later.

(Recording part)
The recording unit 302 is for recording the wireless station ID 501, the measurement number 502, the measurement data 503, and the transmission cycle setting information 504 described in the wireless packet 6 when the aggregation wireless device 4 receives the wireless packet 6. .

(Output interface)
The output interface 303 of the aggregation wireless device 4 is used to transfer the wireless packet 6 received by the aggregation wireless device 4 to the data processing device 5 as a packet reception notification signal 8.

(timer)
The timer 304 of the aggregation wireless device 4 is used to determine whether a certain time has elapsed since the last reception of the wireless packet 6. The control unit 301 of the centralized wireless device 4 determines that the centralized wireless device 4 has passed through the communicable area with the terminal wireless device 3 when a certain time has elapsed since the last reception of the wireless packet 6.

(Wireless communication part)
The wireless communication unit 305 of the aggregation wireless device 4 has a function of receiving the wireless packet 6 transmitted from the terminal wireless device 3. Here, since the wireless packet 6 is transmitted by multicast, it can be received by a plurality of aggregation wireless devices 4.

(counter)
The counter 306 of the aggregation wireless device 4 is for counting the number of wireless packets received from the wireless packets 6 transmitted by the terminal wireless device 3 at regular intervals. For example, if the wireless packet 6 can be received seven times from when the centralized wireless device 4 enters the communicable area with the terminal wireless device 3 until it passes through the communicable area, the number of received packets 601 is “7”.

(cable)
The cable 7 is a cable for the aggregation wireless device 4 to notify the data processing device 5 of the packet reception notification signal 12, and may be wired or wireless.

(Configuration of data processing device)
FIG. 4 shows a configuration example of the data processing device 5 of the first embodiment. As illustrated in FIG. 4, the data processing device 5 includes a control unit 401, a database 402, an input interface 403, a notification unit 404, a received packet number estimation unit 405, a duplicate data detection unit 406, and a reception state determination unit 407. Hereinafter, functions of the control unit 401, the database 402, the input interface 403, the notification unit 404, the received packet number estimation unit 405, the duplicate data detection unit 406, and the reception state determination unit 407 will be described.

(Control part)
The control unit 401 of the data processing device 5 has a function of controlling the database 402, the input interface 403, the notification unit 404, the received packet number estimation unit 405, the duplicate data detection unit 406, and the reception state determination unit 407. A series of operations of the control unit 401 will be described later.

(Database)
Measurement data 503 measured by the terminal wireless device 3 is stored in the database 402 of the data processing device 5. In addition, the radio station ID 501 and the measurement number 502 are also stored together so that the measurement data can be grasped from which terminal radio device 3 is the measurement data measured at which timing.

(Input interface)
The input interface 403 of the data processing device 5 is used to receive the packet reception notification signal 8 notified by the aggregation wireless device 4.

(Duplicate data deletion part)
Since the wireless packet 6 is multicast as described above, a plurality of aggregation wireless devices 4 may receive the wireless packet 6 including the same measurement data 503. In this case, the data processing device 5 receives the packet reception notification signal 8 including the same measurement data 503 from the plurality of aggregation wireless devices 4.

  When the packet reception notification signal 12 notified from the aggregation wireless device 4 is received, the wireless station ID 501 and the measurement number 502 already stored in the database 402, and the wireless station ID 501 and the measurement number described in the packet reception notification signal 8 When the wireless station ID 501 and the measurement number 502 are both the same, it is determined that the plurality of centralized wireless devices 4 have received the wireless packet 6 in which the same measurement data 503 is described.

(Notification part)
When the control unit 401 determines that the communication quality between the terminal wireless device 3 and the aggregation wireless device 4 has deteriorated, the notification unit 404 of the data processing device 5 notifies the user to that effect. The notification unit may notify the user visually such as a light emitting diode or a liquid crystal display, or audibly like a speaker. Furthermore, a method of directly mailing to a user's mobile phone using the Internet may be used.

(Received packet number estimation part)
The received packet number estimation unit of the data processing device 5 obtains an expected value from the transmission cycle of the wireless packet 6 and the train speed 9 as to how many wireless packets 6 can be received by the aggregation wireless device 4. Formula 1 below is an example of an expected value calculation method.

なお、Ｒ：期待値（推定受信パケット数）、Ｌ：通信可能エリア、Ｖ：列車速度９、Ｔ：端末無線装置３の送信周期である。

Note that R: expected value (estimated number of received packets), L: communicable area, V: train speed 9, T: transmission cycle of the terminal wireless device 3.

  Here, the communicable area L is a fixed value determined by a communication method used such as low-power radio, weak radio, ZigBee, antenna gain, transmission output, and the like, and is assumed to be approximately 30 to 100 m.

(Reception status determination unit)
The reception state determination unit 407 of the data processing device 5 compares the estimated number of received packets calculated by the received packet number estimation unit 405 with the number of wireless packets actually received. By comparing the estimated number of received packets calculated by the received packet number estimating unit with the number of packets actually received by the aggregation wireless device 4, the degradation of the radio line is determined. Specifically, when Expression 2 becomes positive, it is determined that the wireless line has deteriorated.

なお、Ｒ：期待値（推定受信パケット数）、Ｓ：実際に集約無線装置４が受信したパケット数、Ｇ：通知閾値である。

R: expected value (estimated number of received packets), S: number of packets actually received by the aggregation wireless device 4, and G: notification threshold.

  Here, in Equation 2, when it is determined by the notification threshold G that the estimated number of received packets has deteriorated below a certain value from the number of packets actually received, the reception state deterioration is notified to the user.

(cable)
The cable 7 is a cable for the aggregation wireless device 4 to notify the data processing device 5 of the packet reception notification signal 12.

(A series of operations of the terminal wireless device)
FIG. 8 shows a series of operations of the terminal radio apparatus 3. These operations are performed by the control unit 201 controlling each function of the measurement unit 202, the measurement unit 203, the timer 204, the wireless communication unit 205, and the sensor 206.

(S701)
The control unit 201 reads time information from the timer 204 and determines whether it is a measurement time. Here, when the control unit 201 determines that it is a predetermined measurement time, the measurement unit 203 is notified of a measurement instruction.

(S702)
The measuring unit 203 measures the state of the railway electrical facility 2 using the sensor 206. The data measured here is recorded in the recording unit 202 as measurement data 503. Here, when measurement data 503 previously measured using the measurement unit 203 is recorded in the recording unit 202, overwriting is performed.

(S703)
When the measurement is completed, the measurement number 502 recorded in the recording unit 202 is updated.

(S704)
The control unit 201 reads time information from the timer 204 and determines whether it is the transmission time of the wireless packet 6.

(S705)
The control unit 201 extracts the wireless station ID 501, the measurement number 502, and the measurement data 503 recorded in the recording unit 202. Further, the control unit 201 generates a wireless packet 6 including a wireless station ID 501, a measurement number 502, measurement data 503, and transmission cycle setting information 504.

(S706)
The wireless communication unit 204 transmits the wireless packet 6.

(A series of operations of the aggregation wireless device)
FIG. 9 shows a series of operations of the aggregation wireless device 4 in the present embodiment. These operations are performed by the control unit 301 controlling the recording unit 302, the output interface 303, the timer 304, the wireless communication unit 305, and the counter 306.

(S801)
The wireless communication unit 305 waits for reception so that the wireless packet 6 transmitted by the terminal wireless device 3 can be received.

(S802)
It is determined whether or not the wireless packet 6 transmitted by the terminal wireless device 3 has been received.

(S803)
A wireless station ID 501, a measurement number 502, measurement data 503, and transmission cycle setting information 504 are extracted from the wireless packet 6. The extracted wireless station ID 501, measurement number 502, measurement data 503, and transmission cycle setting information 504 are recorded in the recording unit 302.

(S804)
Since the terminal wireless device transmits the wireless packet 6 at regular intervals (for example, every 2 seconds), there is a possibility of receiving a plurality of wireless packets 6 within the communicable area. Therefore, the received packet count 601 is updated by the counter 306 every time the wireless packet 6 is received. The number of received packets 601 is recorded in the recording unit 302.

(S805)
If the wireless packet 6 cannot be received even after a certain time (for example, 30 seconds), the aggregated wireless device 4 determines that it has passed through the communicable area with the terminal wireless device 3.

(S806)
The control unit 601 generates a packet reception notification signal 8 from the wireless station ID 501, measurement number 502, measurement data 503, transmission cycle setting information 504, and received packet number 601 recorded in the recording unit 302.

(S807)
The control unit 401 notifies the data processing device 5 of the packet reception notification signal 8.

(S808)
The control unit 301 resets the wireless station ID 501, the measurement number 502, the measurement data 503, the transmission cycle setting information 504, and the number of received packets 601 recorded in the recording unit 302.

(A series of operations of the data processing device 5)
FIG. 9 shows a series of operations of the data processing apparatus 5 in the first embodiment. These operations are performed by the control unit 401 controlling the functions of the database 402, the input interface 403, the notification unit 404, the received packet estimation unit 405, the duplicate data detection unit 406, and the reception state determination unit 407.

(S901)
It waits until it receives the packet reception notification signal 12 notified by the aggregation wireless device 4.

(S902)
It is determined whether the packet reception notification signal 12 has been received.

(S903)
The wireless station ID 501, measurement number 502, and measurement data 503 are extracted from the packet reception notification signal 12.

(S904)
When the wireless station ID 501 and the measurement number 502 stored in the database 402 are compared with the wireless station ID 501 and the measurement number 502 described in the packet reception notification signal 12, respectively, and both the wireless station ID 501 and the measurement number 502 are the same Determines that the plurality of aggregation wireless devices 4 have received the wireless packet 6 in which the same measurement data 503 is described. The duplicate data detection unit 406 performs the process of S904.

(S905)
When the database 402 does not have the same wireless station ID 501 and measurement number 502, that is, the same measurement data 503, the wireless station ID 501 described in the packet reception notification signal 8 received this time, the measurement number 502, and the measurement data 503 are stored. Record in database 402.

(S906)
The transmission cycle setting information 504 and the number of received packets 601 are extracted from the packet reception notification signal 8.

(S907)
Train speed information is acquired from the train 1.

(S908)
The received packet number estimation unit 405 calculates the estimated number of received packets based on the transmission cycle setting information 504 and the train speed 9.

(S909)
The estimated number of received packets and the number of received packets 601 are compared, and if the total number of received packets is lower than the estimated number of received packets by a certain amount or more, it is determined that the wireless line has deteriorated. . The reception status determination unit 407 performs the processing in S909.

(S910)
The notification unit 404 is used to notify the user that the wireless line has deteriorated.

(Supplement)
In the configuration of the first embodiment, the aggregation wireless device 4 and the data processing device 5 are separated as illustrated in FIG. 1, but the function of the data processing device 5 may be included in the aggregation wireless device 4.

(Deterioration of communication quality)
In Equation 2, the larger the value, the greater the degradation of the communication environment. Therefore, the communication unit may notify the notification unit 404 of how much communication degradation has occurred with reference to Equation 2.

(Mounting position of aggregate radio equipment)
When the mutual wireless devices 4 are close to each other, the communication quality may be deteriorated at the same time. For example, when the train 1 has a plurality of trains, the wireless devices 4 are installed at the forefront of the train and the rear of the train. For example, it is desirable to keep the distance between the aggregation wireless devices 4 as much as possible.

<Configuration of Example 2>
In the configuration of the first embodiment, an example in which the data processing device 5 is installed in the train has been described. However, if the packet reception notification signal 12 can be notified from the aggregation wireless device 4 to the data processing device 5, the data The processing device 5 does not have to be in the train. FIG. 11 shows an example in which the data processing device 5 is installed outside the train.

  When the data processing device 5 is installed outside the train, a wireless network such as a wireless LAN (Local Area Network) may be used as a means for transmitting the packet reception notification signal 8 from the aggregation wireless device 4 to the data processing device 5. Alternatively, the user may transmit the packet reception notification signal 12 from the aggregation wireless device 4 to the data processing device 5 using a recording medium such as an SD memory after the traveling is finished.

<Configuration of Example 3>
In the said Example 1, the train speed information which a train outputs the train speed 9 was utilized. The central wireless device 4 or the data processing device 5 may be equipped with a GPS (Global Positioning System), and the train speed 9 may be obtained from the GPS.

  DESCRIPTION OF SYMBOLS 1 ... Train, 2 ... Train electric equipment, 3 ... Terminal radio | wireless apparatus, 4 ... Aggregation radio | wireless apparatus, 5 ... Data processing apparatus, 6 ... Wireless packet, 7 ... Cable, 8 ... Packet reception notification signal, 9 ... Train speed, 201 ... Control unit, 202 ... Recording unit, 203 ... Measurement unit, 204 ... Timer, 205 ... Wireless communication unit, 206 ... Sensor, 207 ... Cable, 208 ... Signal wiring, 301 ... Control unit, 302 ... Measurement unit, 303 ... Output Interface 304 304 timer 305 wireless communication unit 306 counter 401 control unit 402 database 403 input interface 404 notification unit 405 received packet number estimation unit 406 duplicate data detection unit 407: Reception state determination unit, 408 ... Signal wiring, 501 ... Wireless station ID, 502 ... Measurement number, 503 ... Measurement data, 504 ... Transmission period setting Information, 601 ... send and receive packet number, whether it is S701 ... measurement time? S702 ... Measurement processing execution, S703 ... Update of measurement data number, S704 ... Transmission time? , S705 ... Wireless packet 6 generation, S706 ... Transmission processing, S801 ... Put the wireless communication unit 305 in a standby state, S802 ... Judgment whether the wireless packet 6 is received, S803 ... Wireless packet 6 to wireless packet 6 to wireless station ID 501 Then, the measurement number 502, the measurement data 503, and the transmission cycle setting information 504 are extracted. S804: Count the number of receptions of the wireless packet 6. S805: A certain time has passed since the last reception of the wireless packet 6. , S806 ... packet reception notification signal 12 generation, S807 ... the packet reception notification signal 12 is notified to the monitoring device 5, S808 ... radio station ID 501, measurement number 502, measurement data 503, and transmission cycle setting recorded in the recording unit Clear the information 504 and the number of received packets 601; S901: Wait to receive the packet reception notification signal 12; S902: Receive the packet reception notification signal 12? , S903... The radio station ID 501, measurement number 502, and measurement data 503 are extracted from the packet reception notification signal 12. S904... Measurement data already accumulated in the database 402? , S905 ... The measurement data 503 is recorded in the database 402, S906 ... The transmission cycle setting information 504 and the number of received packets 601 are extracted from the packet reception notification signal 12, S907 ... Train speed information acquisition, S908 ... The estimated number of received packets is calculated , S909: Has the wireless line deteriorated? , S910: Notification that the wireless line has deteriorated, 1001: Wireless LAN line.

Claims (5)

A system comprising a terminal radio device provided along a moving path of a vehicle and a plurality of aggregate radio devices and data processing devices mounted on the vehicle, wherein the radio packet transmitted by the terminal radio device periodically is received by the aggregate radio device Because
The terminal wireless device is at least
A measuring unit for measuring the state of railway electrical equipment using a sensor;
A wireless transmission unit for transmitting a wireless packet including measurement data obtained by the measurement unit;
With a timer to determine the measurement time and wireless packet transmission time,
The aggregate wireless device is at least
A wireless receiver that receives the wireless packet transmitted by the terminal wireless device;
An interface for transmitting and receiving packet data between the aggregation wireless device and the data processing device;
The data processing device is at least
An interface for transmitting and receiving packet data between the aggregation wireless device and the data processing device;
A duplicate data detector that detects duplicate reception of the measurement data,
Receiving the wireless packet transmitted by the terminal wireless device by a plurality of the aggregate wireless devices mounted at different positions of a train, thereby improving communication reliability by reliably receiving the wireless packet. A train radio communication system. In the train radio communication system according to claim 1,
The terminal radio apparatus transmits the radio packet including the measurement data obtained by the measurement unit by multicast so that an unspecified number of the aggregate radio apparatuses can receive the radio packet, and the radio packet is transmitted at a fixed period. A train radio communication system characterized by that. In the train radio communication system according to claim 1 or 2,
In the wireless packet, an identification number uniquely assigned to each terminal wireless device, an identification number assigned each time the terminal wireless device performs measurement, and the measurement data are described,
Even when the radio packet transmitted by the terminal radio apparatus is received by a plurality of the aggregate radio apparatuses, the duplicate data detection unit of the data processing apparatus is provided for each terminal radio apparatus described in the radio packet. A train radio communication system characterized by having a function of detecting an overlapping radio packet based on an identification number assigned to each and a measurement number assigned for each measurement. In the train radio communication system according to any one of claims 1 to 3,
The aggregate wireless device further includes
A counter that counts the number of received wireless packets;
A timer for determining whether or not the aggregated wireless device has passed through a communicable area with the terminal wireless device;
The data processing device further includes:
A received packet number estimating unit that estimates the number of packets received by the aggregated wireless device before passing through a communicable area with the terminal wireless device according to a train speed and a transmission cycle of the wireless packet;
A reception state determination unit that determines deterioration of the radio line by comparing the estimated number of received packets calculated by the received packet number estimation unit and the number of radio packets actually received by the aggregation wireless device;
A train radio communication system having a function of monitoring communication quality with respect to a train speed. In the train radio communication system according to claim 2 or 4,
The wireless packet further includes transmission cycle setting information related to the transmission cycle of the wireless packet,
The data processing device has a function of using the transmission cycle setting information and the train speed to estimate the number of packets received before the aggregated wireless device passes through a communicable area with a terminal wireless device. Train radio communication system.

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