COMMUNICATION SYSTEM, DATA TRANSMISSION DEVICE, COMMUNICATION DEVICE, AND COMMUNICATION METHOD

Abstract

To provide a communication system, data transmission device, communication device, and communication method that can exchange sufficient amount of data using a simple configuration without reducing speed of cars.SOLUTION: A communication system transmits data of a data transmission device installed on a route of a moving body having a plurality of cars to the moving body. The plurality of cars provided with respective reception units that receive the data transmitted from the data transmission device, which transmits different data to the respective reception units of the plurality of cars.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] One aspect of the present invention relates to a communication system, a data transmission device, a communication device, and a communication method. [Background technology]

[0002] A conventional communication system is described in Patent Document 1. In this communication system, a receiving device is provided on a vehicle to receive data from a data transmitting device that is underground along a route that the vehicle passes through. The vehicle travels along a route on the data transmitting device, and the receiving device receives the data from the data transmitting device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-20161 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned communication system, in order to grasp the condition of the route, it was necessary to carry out a special inspection using an inspection vehicle. Furthermore, the vehicle had to move with a limited speed in order to receive all data from the data transmission device. In this respect, when other vehicles also pass through the route, the passing conditions of these vehicles must also be taken into consideration. In addition, when an operator tries to check the condition of the route, there is a problem that the distance is too long and it is very time-consuming. In addition, when the performance of the receiving device mounted on the vehicle is improved to increase the receiving speed, there is a problem that the cost increases.

[0005] One object of the present invention is to provide a communication system, a data transmission device, a communication device, and a communication method that can exchange a sufficient amount of data with a simple configuration without reducing the vehicle speed. [Means for solving the problem]

[0006] A communication system according to one embodiment of the present invention is a communication system that transmits data from a data transmission device installed on the route of a mobile body having a plurality of cars in a single formation, wherein each of the plurality of cars is provided with a receiving unit that receives the data transmitted from the data transmission device, and the data transmission device transmits different data to each of the receiving units of the plurality of cars.

[0007] A data transmission device according to one embodiment of the present invention is a data transmission device that is provided on a route of a mobile body having a plurality of cars in a single formation, and transmits data to the mobile body, and transmits different data to a plurality of receiving units provided in each of the plurality of cars of the mobile body.

[0008] A communication device according to one embodiment of the present invention is provided on a mobile body having a plurality of cars in a single formation, and receives data from a data transmission device provided on the route of the mobile body. The communication device comprises a plurality of receiving units provided on the plurality of cars and receiving different data, and a data synthesis unit that synthesizes the different data received by each of the receiving units.

[0009] A communication method according to one embodiment of the present invention is a communication method for transmitting data from a data transmission device installed on a route of a mobile body having a plurality of cars in a single formation, and includes a receiving step of receiving information from the mobile body, the plurality of cars each having a receiving unit for receiving data transmitted from the data transmission device, and a transmitting step of transmitting different data to each receiving unit of the plurality of cars based on the information. Effect of the Invention

[0010] According to one embodiment of the present invention, there is provided a communication system, a data transmission device, a communication device, and a communication method that are capable of exchanging a sufficient amount of data with a simple configuration without reducing the speed of a moving body. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic configuration diagram showing a data transmission device, a communication device, and a communication system according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a block diagram showing a block configuration of a communication system. [Diagram 3] 11 is a table showing a data transmission status by a data transmission device. [Figure 4] 4 is a schematic diagram showing how a data transmission device transmits data to a receiving unit of each vehicle. FIG. [Diagram 5] 11 is a schematic diagram showing another example of a transmission mode of data adjusted by the data adjustment unit; FIG. [Figure 6] 11 is a schematic diagram showing another example of a transmission mode of data adjusted by the data adjustment unit; FIG. [Figure 7] 4 is a flowchart illustrating a communication method according to an embodiment of the present invention. [Figure 8] 4 is a flowchart illustrating a communication method according to an embodiment of the present invention. [Figure 9] 4 is a flowchart illustrating a communication method according to an embodiment of the present invention. [Figure 10] 1 is a diagram showing a schematic diagram of a moving object's movement mode and its positional relationship with a communication area. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicated explanations will be omitted.

[0013] 1 is a schematic diagram showing a data transmission device 100, a communication device 150, and a communication system 200 according to an embodiment of the present invention. The communication system 200 is a system that transmits data from a data transmission device 100 provided on a route 3 of a moving body 1 having a plurality of vehicles 2 in a single formation to the moving body 1. The data transmission device 100 is provided on a route 3 of the moving body 1 having a plurality of vehicles 2 in a single formation, and is a device that transmits data to the moving body 1. The communication device 150 is provided on a moving body 1 having a plurality of vehicles 2 in a single formation, and is a device that receives data from the data transmission device 100 provided on the route 3 of the moving body 1.

[0014] In this embodiment, a train such as a Shinkansen is exemplified as the moving object 1. A train is configured by sequentially coupling a plurality of cars 2 to a car 2 (leading car) in which a driver's seat is provided. In this case, the rails on which the train runs are the route 3.

[0015] The communication device 150 has a plurality of receiving units 10. The plurality of vehicles 2 are each provided with a receiving unit 10 that receives data transmitted from the data transmission device 100. In this embodiment, for ease of explanation, it is assumed that three receiving units 10 are provided in sequence starting from the leading vehicle 2. In the following explanation, the leading vehicle 2 may be referred to as "vehicle 2A", and the receiving unit 10 provided in the vehicle 2A may be referred to as "receiving unit 10A". The second vehicle 2 from the front may be referred to as "vehicle 2B", and the receiving unit 10 provided in the vehicle 2B may be referred to as "receiving unit 10B". The third vehicle 2 from the front may be referred to as "vehicle 2C", and the receiving unit 10 provided in the vehicle 2C may be referred to as "receiving unit 10C".

[0016] The moving object 1 is not limited to a train as long as it has a plurality of cars 2, and may be, for example, a transport vehicle such as a truck having a plurality of freight cars coupled to a leading car. In this case, the road on which the transport vehicle runs is the route 3.

[0017] The data transmission device 100 is provided at a predetermined position on the path 3. Here, the data transmission device 100 is provided underground under the rail. The position of the data transmission device 100 on the path 3 is not particularly limited, and the data transmission device 100 may be attached to a structure such as a pillar near the rail. A communication area DE, which is an area where communication is possible, is set for the data transmission device 100. The data transmission device 100 can transmit data to the receiving units 10 that have moved with the moving body 1 and have entered the communication area DE. In this embodiment, as the moving body 1 moves, the receiving units 10A, 10B, and 10C enter the communication area DE in this order, and the receiving units 10A, 10B, and 10C leave the communication area DE in this order. Therefore, the data transmission device 100 transmits data in the order of the receiving units 10A, 10B, and 10C.

[0018] Next, a block configuration of the communication system 200 will be described with reference to Fig. 2. Fig. 2 is a block configuration diagram showing a block configuration of the communication system 200. As shown in Fig. 2, the communication system 200 includes the data transmitting device 100 and the communication device 150 described above.

[0019] The data transmission device 100 is a device that transmits different data to the respective receiving units 10 of the multiple vehicles 2. The data transmission device 100 includes a communication unit 21, a parameter acquisition unit 22, a data adjustment unit 23, and a storage unit 24.

[0020] The communication unit 21 communicates with the communication device 150 to transmit information to the communication device 150 and to receive information from the communication device 150. The communication unit 21 transmits data in a transmission mode set by the data adjustment unit 23.

[0021] The parameter acquisition unit 22 acquires information on parameters that affect data transmission. The parameter acquisition unit 22 acquires the information on the parameters from the information on the communication device 150 received by the communication unit 21. Specifically, the parameter acquisition unit 22 acquires, as parameters, the number of vehicles on which the receiving units 10 of the moving objects 1 are provided, the distance between the receiving units 10 of the moving objects 1, and the speed of the moving objects 1. In addition, the parameter acquisition unit 22 acquires, as a parameter, the total amount of all data to be transmitted by reading out data stored in the storage unit 24.

[0022] The data adjustment unit 23 adjusts the transmission mode of data to the respective receivers 10 of the multiple vehicles 2. Here, even if the data transmission device 100 transmits multiple pieces of data to one receiver 10, the data transmission is not successful for all the data, and the data transmission fails for some of the data. Therefore, the data transmission device 100 retransmits the data for which the data transmission has failed. For example, as shown in the table of FIG. 3, a total of n pieces of data, from "data 1" to "data n", are transmitted. In contrast, the data indicated as "Ack" is the data for which the transmission has been successful, and the data indicated as "No Ack" is the data for which the transmission has failed. Therefore, the data transmission device 100 retransmits the data corresponding to "No Ack" (for example, data X, data n-1, data n). In addition, even if the multiple pieces of data for which the transmission has failed are retransmitted, the transmission of all the data is not successful, so that the data for which the transmission has failed again needs to be retransmitted again. In this way, by repeatedly retransmitting the data, the number of retransmitted pieces of data is gradually reduced, and the transmission of all the data is finally completed.

[0023] In response to this, the data adjustment unit 23 adjusts the timing of retransmission of the data. The data adjustment unit 23 may retransmit the data to a receiver 10 other than the one to which the transmission failed. In this case, the communication unit 21 transmits predetermined data to the receiver 10 of one vehicle 2, and then transmits the retransmission portion of the predetermined data to the receiver 10 of the other vehicle 2.

[0024] With reference to Fig. 4, the transmission mode of the data adjusted by the data adjustment unit 23 will be described. Fig. 4 is a schematic diagram showing how the data transmission device 100 transmits data to the receiving units 10A, 10B, 10C of the respective vehicles 2A, 2B, 2C. The bar graph corresponding to "vehicle 2A·receiving unit 10A" shows the contents of the data transmitted to the receiving unit 10A of the vehicle 2A. Note that time progresses from top to bottom in the bar graph. Note that in this specification, a collection of multiple data is referred to as a "data group."

[0025] In the example shown in Fig. 4, the data adjustment unit 23 transmits all data in sequence according to the numbers corresponding to each data, without dividing the data, and when the first transmission of all data is completed, retransmission of data that has failed to be transmitted is performed. Note that, since the data is not divided into a plurality of groups, the following description will be given assuming that all data belongs to "data group 1". Also, a set of data that has failed to be transmitted in data group 1 is referred to as "retransmission data group 1".

[0026] With such settings, the data transmitting device 100 sequentially transmits data of the data group 1 to the receiving unit 10A. Here, the data capacity that the receiving unit 10A can receive is smaller than the total capacity of the data group 1. Therefore, the data transmitting device 100 transmits the transmittable amount of data (here, 66% of the total data) to the receiving unit 10A of the vehicle 2A. Next, the data transmitting device 100 transmits the remaining data (34% of the total data) to the receiving unit 10B of the vehicle 2B. Here, the receiving unit 10B of the vehicle 2B has a margin in the data capacity that it can receive. Therefore, the data transmitting device 100 performs the first retransmission of the retransmission data group 1. Note that the remaining data capacity of the receiving unit 10B of the vehicle 2B is smaller than the data capacity of the first retransmission data group 1. Therefore, the data transmitting device 100 transmits the remaining data of the first retransmission data group 1 to the receiving unit 10C of the vehicle 2C. The data transmission device 100 performs a second retransmission to the receiving unit 10C of the vehicle 2C for retransmission data group 1 consisting of multiple data items that failed in the first retransmission. The data transmission device 100 completes the transmission of all data by repeating the retransmission of the retransmission group 1 multiple times (n times). In the following explanation, when it is said that "resend the retransmission group", it means that the transmission of all data is completed by repeating the retransmission multiple times, unless otherwise specified.

[0027] The data adjustment unit 23 may be set to divide all data to be transmitted into a plurality of data groups and transmit each data group to a different receiving unit 10. In this case, the communication unit 21 transmits the plurality of divided data groups to the receiving units 10 of the different vehicles 2. The data adjustment unit 23 may be set to retransmit data to the same receiving unit 10 as the one that failed to transmit the data.

[0028] Another example of the transmission mode of data adjusted by the data adjustment unit 23 will be described with reference to Fig. 5. In the example shown in Fig. 5, the data adjustment unit 23 divides all data to be transmitted into three data groups 1, 2, and 3 according to the number of receiving units 10A, 10B, and 10C. Furthermore, even after transmitting the data groups 1, 2, and 3, the data adjustment unit 23 ensures that some data capacity remains for each of the receiving units 10A, 10B, and 10C, and retransmits the retransmission data groups 1, 2, and 3 using the remaining capacity.

[0029] With these settings, data transmitting device 100 transmits data of data group 1 to receiving unit 10A. Then, data transmitting device 100 retransmits retransmission data group 1 to receiving unit 10A. Next, data transmitting device 100 transmits data of data group 2 to receiving unit 10B. Then, data transmitting device 100 retransmits retransmission data group 2 to receiving unit 10B. Next, data transmitting device 100 transmits data of data group 3 to receiving unit 10C. Then, data transmitting device 100 retransmits retransmission data group 3 to receiving unit 10C.

[0030] When the capacity of all the receiving units 10 of one mobile body 1 is not enough to transmit all the data to be transmitted, the data adjustment unit 23 may divide all the data into a plurality of data groups and transmit each data group to the receiving units 10 of the multiple mobile bodies 1. The data adjustment unit 23 may be set to retransmit data to the receiving units 10 of the same composition as the one that failed to transmit.

[0031] With reference to Fig. 6, another example of the transmission mode of data adjusted by the data adjustment unit 23 will be described. In the example shown in Fig. 6, the data adjustment unit 23 divides all data to be transmitted into three data groups 1, 2, and 3 according to the capacity of all data to be transmitted and the total data capacity of all receivers 10 of the mobile bodies 1 per one composition. Furthermore, even after transmitting the data groups 1, 2, and 3, the data adjustment unit 23 ensures that the data capacity of compositions 1, 2, and 3 remains, and retransmits the retransmission data groups 1, 2, and 3 for the remaining capacity. The transmission mode of data to the multiple receivers 10 of each composition 1, 2, and 3 is the same as the example shown in Figs. 4 and 5.

[0032] The data adjustment unit 23 adjusts the mode of data transmission to each of the receivers 10 of the multiple vehicles 2 according to the number of vehicles acquired by the parameter acquisition unit 22. In this embodiment, the moving body 1 has three receivers 10A, 10B, and 10C. Therefore, the data adjustment unit 23 adjusts how data is distributed to the three receivers 10A, 10B, and 10C. The data adjustment unit 23 adjusts the mode of data transmission to each of the receivers 10 of the multiple vehicles 2 according to the distance between the receivers 10 acquired by the parameter acquisition unit 22. That is, the longer the distance between the receivers 10, the longer the time from when the receiver 10 enters the communication area DE until the next receiver 10 enters the communication area DE. The data adjustment unit 23 adjusts the mode of data transmission to each of the receivers 10 of the multiple vehicles 2 according to the speed of the moving body 1 acquired by the parameter acquisition unit 22. The faster the speed of the moving body 1, the longer the time each receiver 10 stays in the communication area DE. The data adjustment unit 23 adjusts the mode of data transmission to the receiving unit 10 of each of the multiple vehicles 2 according to the total amount of all data to be transmitted.

[0033] The memory unit 24 is a part that stores various types of information. The memory unit 24 stores data to be transmitted by the data transmission device 100. The data to be transmitted includes information on at least one item of temperature, current, voltage, vibration, and partial discharge of the cable installed on the path 3. This information is updated at a predetermined period (for example, once a day). Note that a sensor (not shown) that detects information on the above items is installed on the path 3. The sensor transmits the obtained detection results to the memory unit 24. As a result, the memory unit 24 stores the latest information.

[0034] Next, a block configuration of the communication device 150 will be described. The communication device 150 includes the above-mentioned receiving unit 10, parameter transmitting unit 11, storage unit 12, and data combining unit 13. Note that the storage unit 12 and the data combining unit 13 may be provided in any one of the multiple vehicles 2 of the moving object 1, and may be provided in the leading vehicle 2, for example.

[0035] The storage unit 12 stores parameters related to the moving object 1 to be transmitted to the data transmission device 100. The receiving units 10A, 10B, and 10C have a function of transmitting the parameters stored in the storage unit 12 to the data transmission device 100. The parameters transmitted by the parameter transmission unit 11 are those related to the moving object 1 among the parameters acquired by the parameter acquisition unit 22 described above.

[0036] The data combiner 13 combines different data received by each receiver 10. For example, in the example shown in FIG. 4, the data combiner 13 combines the data group 1 (successfully transmitted data) received by the receiver 10A, the data group 1 (successfully transmitted data) received by the receiver 10B, the retransmission data group 1 received by the receiver 10B, and the retransmission data group 1 received by the receiver 10C. In the example shown in FIG. 5, the data combiner 13 combines the data groups 1, 2, and 3 (successfully transmitted data) received by the receivers 10A, 10B, and 10C, and the retransmission data groups 1, 2, and 3 received by the receivers 10A, 10B, and 10C. In the example shown in FIG. 6, the data combiner 13 of one of the compositions 1, 2, and 3 combines the data groups 1, 2, and 3 and the retransmission data groups 1, 2, and 3 acquired by each composition 1, 2, and 3.

[0037] Next, a communication method according to an embodiment of the present invention will be described with reference to Figs. 7 to 9. Figs. 7 to 9 are flowcharts showing a communication method according to an embodiment of the present invention. Here, an example of a flowchart will be described in which the data transmission device 100 transmits data to the receiving unit 10A of the vehicle 2A, the receiving unit 10B of the vehicle 2B, and the receiving unit 10C of the vehicle 2C in the transmission mode shown in Fig. 4. This communication method is a method of transmitting data of the data transmission device 100 provided on the route of a moving object 1 to the receiving units 10A, 10B, and 10C of the moving object 1 having a plurality of vehicles 2A, 2B, and 2C in one formation.

[0038] As shown in FIG. 7, first, the data transmitting device 100 searches for a destination to which data is to be transmitted. The data transmitting device 100 transmits a signal declaring the establishment of communication to the surroundings at a constant time interval (step S100). If the receiving unit 10A has not arrived within the range of the communication area DE, the signal is not received (arrow indicated by a dashed line), but if the receiving unit 10A arrives within the range of the communication area DE, the signal is received by the receiving unit 10A (arrow indicated by a solid line). This allows the data transmitting device 100 to know that the receiving unit 10A is present within the range of the communication area DE. Next, the data transmitting device 100 establishes communication with the receiving unit 10A. Here, the data transmitting device 100 receives a connection request signal from the receiving unit 10A (step S110) and transmits a response signal indicating that the connection has been established to the receiving unit 10A (step S120). This allows communication to be established between the data transmitting device 100 and the receiving unit 10A.

[0039] Next, the data transmitting device 100 performs a data transmission plan. Here, the data transmitting device 100 executes a receiving step of receiving information from a moving body 1 in which receiving units 10A, 10B, and 10C for receiving data transmitted from the data transmitting device 100 are provided in a plurality of vehicles 2A, 2B, and 2C, respectively. Specifically, the data transmitting device 100 receives a data request signal together with parameter information from the receiving unit 10A (step S130). As a result, the data transmitting device 100 executes the data transmission plan (step S140). In step S140, the data adjustment unit 23 of the data transmitting device 100 adjusts the data transmission mode as described in FIG. 4 based on the received parameters and the data capacity to be transmitted. As a result, the data transmitting device 100 makes a plan on how to transmit the data. After that, the data transmitting device 100 transmits a signal indicating that the data transmission plan has been completed to the receiving unit 10A (step S150).

[0040] Next, the data transmitting device 100 transmits data for a part of the data group 1 to the receiving unit 10A. The data transmitting device 100 repeats the data transmission (step S160) to the receiving unit 10A a determined number of times. This completes the data transmission of the data transmitting device 100 to the receiving unit 10A.

[0041] Next, the data transmitting device 100 searches for the receiving unit 10B and establishes communication. As in step S100, the data transmitting device 100 transmits a signal declaring the establishment of communication to the surroundings at regular time intervals (step S170) and detects the presence of the receiving unit 10B within the range of the communication area DE. Next, the data transmitting device 100 receives a connection request signal from the receiving unit 10B (step S180) and transmits a response signal indicating that the connection has been established to the receiving unit 10B (step S190). This establishes communication between the data transmitting device 100 and the receiving unit 10B.

[0042] Next, the data transmitting device 100 transmits data to the receiving unit 10B. The data transmitting device 100 receives a data request signal from the receiving unit 10B (step S200). The data transmitting device 100 transmits the remaining data of data group 1 to the receiving unit 10B (step S210) and retransmits retransmission data group 1 (step S220). This completes the data transmission of the data transmitting device 100 to the receiving unit 10B.

[0043] Next, the data transmitting device 100 searches for the receiving unit 10C and establishes communication. As in step S100, the data transmitting device 100 transmits a signal declaring the establishment of communication to the surroundings at regular time intervals (step S230) and detects the presence of the receiving unit 10C within the range of the communication area DE. Next, the data transmitting device 100 receives a connection request signal from the receiving unit 10C (step S240) and transmits a response signal indicating that the connection has been established to the receiving unit 10C (step S250). This establishes communication between the data transmitting device 100 and the receiving unit 10C.

[0044] Next, the data transmitting device 100 transmits data to the receiving unit 10C. The data transmitting device 100 receives a data request signal from the receiving unit 10C (step S260). The data transmitting device 100 retransmits the remaining retransmission data group 1 to the receiving unit 10C (step S270). This completes the data transmission of the data transmitting device 100 to the receiving unit 10C. As described above, steps S160, S210, S220, and S270 are performed to transmit different data to the receiving units 10A, 10B, and 10C of the multiple vehicles 2A, 2B, and 2C, respectively, based on the information.

[0045] Next, a data synthesis step is executed in which the communication device 150 synthesizes the different data received by the different receiving units 10A, 10B, and 10C (step S280). Here, the data synthesis unit 13 synthesizes the data received by the receiving units 10A, 10B, and 10C in steps S160, S210, S220, and S270. With the above, the flow charts shown in FIGS. 7 to 9 are completed.

[0046] Next, the operation and effect of the communication system 200 according to this embodiment will be described.

[0047] The communication system 200 of this embodiment is a communication system that transmits data from a data transmission device 100 provided on a route 3 of a moving body 1 having a plurality of cars 2 in a single formation, and each of the plurality of cars 2 is provided with a receiving unit 10 that receives the data transmitted from the data transmission device 100, and the data transmission device 100 transmits different data to each of the receiving units 10 of the plurality of cars 2.

[0048] In this communication system 200, a plurality of vehicles 2 are provided with a receiving unit 10 that receives data transmitted from a data transmission device 100. The data transmission device 100 transmits different data to each of the receiving units 10 of the plurality of vehicles 2. In this case, even if the speed of the vehicle is so high that the data transmission device 100 cannot transmit all data to one receiving unit 10, it is sufficient that all data can be transmitted by combining the data transmitted to the plurality of receiving units 10. In this way, the moving body does not need to perform low-speed driving for special inspections, and data can be obtained even during normal driving. In addition, the receiving unit 10 provided in the vehicle does not need to be expensive and has a large capacity. As described above, a sufficient amount of data can be exchanged with a simple configuration without reducing the speed of the moving body 1.

[0049] The data transmission device 100 may transmit predetermined data to the receiving unit 10 of one vehicle 2, and then transmit a retransmission of the predetermined data to the receiving unit 10 of another vehicle 2. In this case, even if there is data that has failed to be transmitted to one receiving unit 10, the other receiving unit 10 can receive the retransmission data. For example, if one receiving unit 10 must receive all data even if a transmission failure occurs, it becomes necessary to take measures that increase costs, such as improving the performance of the receiving unit 10 or improving communication performance, or to reduce the speed of the moving body 1. However, the data transmission device 100 of this embodiment makes it possible to easily transmit all data without the need to take such measures.

[0050] The data transmission device 100 may divide all data to be transmitted into a plurality of data groups and transmit each data group to a receiver of a different vehicle. In this case, even if the data transmission device transmits a large amount of data, all data can be transmitted as a result by distributing the data to a plurality of receivers 10. For example, if all data must be received by one receiver 10 even if the data volume is large, it becomes necessary to take measures that increase costs, such as improving the performance of the receiver 10 or improving communication performance, or to reduce the speed of the moving object 1. However, the data transmission device 100 of this embodiment can easily transmit all data without the need to take such measures.

[0051] The data transmission device 100 may obtain the number of vehicles equipped with the receiving units 10 of the moving objects 1, and adjust the mode of data transmission to the receiving units 10 of each of the multiple vehicles 2 according to the obtained number of vehicles. In this case, the data transmission device 100 can transmit data in an appropriate transmission mode according to the number of vehicles.

[0052] The data transmission device 100 may acquire the distance between the receiving units 10 of the moving objects 1, and adjust the mode of data transmission to each of the receiving units 10 of the multiple vehicles 2 according to the acquired distance. In this case, the data transmission device 100 can transmit data in an appropriate transmission mode according to the distance between the receiving units 10 of the moving objects 1.

[0053] The data transmission device 100 may acquire the speed of the moving object 1, and adjust the mode of data transmission to the receiving units 10 of the multiple vehicles 2 according to the acquired speed. In this case, the data transmission device 100 can transmit data in an appropriate transmission mode according to the speed of the moving object 1.

[0054] The data transmission device 100 may adjust the mode of data transmission to the receiving unit 10 of each of the multiple vehicles 2 according to the total amount of all data to be transmitted. In this case, the data transmission device 100 can transmit data in an appropriate transmission mode according to the total amount of all data.

[0055] The data to be transmitted by the data transmission device 100 may include at least one item of information on the temperature, current, voltage, vibration, and partial discharge of the cable installed on the path 3. This allows the receiving unit 10 of the moving object 1 to inspect the cable while driving normally, without having to slow down the moving speed to perform a special inspection.

[0056] The data transmission device 100 of this embodiment is provided on a route 3 of a moving body 1 having multiple cars 2 in a single formation, and transmits data to the moving body 1, and transmits different data to multiple receiving units 10 provided in each of the multiple cars 2 of the moving body 1.

[0057] The communication device 150 of this embodiment is provided in a mobile body 1 having a plurality of cars 2 in a single formation, and receives data from a data transmission device 100 provided on a route 3 of the mobile body 1, and is equipped with a plurality of receiving units 10 provided in the plurality of cars 2 and receiving different data from each other, and a data synthesis unit 13 that synthesizes the different data received by each receiving unit 10.

[0058] The communication method of this embodiment is a communication method for transmitting data from a data transmission device 100 provided on a route 3 of a mobile body 1 having a plurality of cars 2 in a single formation, and includes a receiving step for receiving information from the mobile body 1, each of which is provided with a receiving unit 10 that receives data transmitted from the data transmission device 100, and a transmitting step for transmitting different data to each receiving unit 10 of the plurality of cars 2 based on the information.

[0059] According to the above data transmission device 100, communication device 150, and communication method, it is possible to obtain the same functions and effects as the above-mentioned communication system.

[0060] The present invention is not limited to the above-described embodiments.

[0061] In the above embodiment, only the first three cars are provided with the receiving units 10. However, the number of receiving units 10 is not particularly limited, and the number of receiving units 10 may be the same as the number of cars 2, by providing a receiving unit 10 in all cars 2.

[0062] Also, as shown in FIG. 10, in order to efficiently arrange the receiving units 10, taking into consideration the length of the vehicle 2 and the range of the communication area DE, a vehicle 2 without a receiving unit 10 may be arranged between vehicles 2 with receiving units 10. FIG. 10 is a diagram showing a schematic diagram of the traveling state of the moving body 1 and the positional relationship with the communication area DE. As shown in FIG. 10, the receiving unit 10B enters the communication area DE before the receiving unit 10A leaves the communication area DE. In this case, even though there are two receiving units 10A and 10B in the communication area DE, data can only be transmitted to one of the receiving units, and the capacity of the other receiving unit is wasted. Therefore, it is preferable to omit the receiving unit 10B. [Explanation of symbols]

[0063] 1...mobile body, 2...vehicle, 3...route, 10...receiving unit, 13...data synthesis unit, 100...data transmitting device, 150...communication device, 200...communication system.

Claims

1. A communication system for transmitting data from a data transmission device installed on a route of a moving object having a plurality of cars in a single formation, comprising: The plurality of vehicles are each provided with a receiving unit for receiving the data transmitted from the data transmission device, and the different data received by each of the receiving units is synthesized, The data transmission device transmits different data to the receiving units of each of the plurality of vehicles while the moving body is traveling on the route.

2. A communication system for transmitting data from a data transmission device installed on a route of a moving object having a plurality of cars in a single formation, comprising: Each of the vehicles is provided with a receiving unit that receives the data transmitted from the data transmission device, the data transmission device transmits different data to the receiving units of the plurality of vehicles, A communication system in which the data transmission device transmits predetermined data to the receiving unit of one vehicle, and then transmits a retransmission of the predetermined data to the receiving unit of another vehicle.

3. 3. The communication system according to claim 1, wherein the data transmission device divides all data to be transmitted into a plurality of data groups and transmits each of the data groups to the receiving units of different vehicles.

4. The data transmission device includes: Acquire the number of vehicles in which the receiving units of the moving bodies are provided; The communication system according to any one of claims 1 to 3, further comprising: adjusting how data is allocated to the receiving units of the plurality of vehicles according to the acquired number of vehicles.

5. The data transmission device includes: Acquire the distance between the receiving units of the moving bodies; 5. The communication system according to claim 1, further comprising: adjusting how data is allocated to the receiving units of the plurality of vehicles according to the acquired distance.

6. The data transmission device includes: Acquire the speed of the moving object; 6. The communication system according to claim 1, further comprising: adjusting how data is allocated to the receiving unit of each of the plurality of vehicles according to the acquired speed.

7. The communication system according to any one of claims 1 to 6, wherein the data transmission device adjusts how data is allocated to the receiving unit of each of the plurality of vehicles depending on a total amount of all data to be transmitted.

8. The communication system according to any one of claims 1 to 7, wherein the data to be transmitted by the data transmission device includes information on at least one of the following items: temperature, current, voltage, vibration, and partial discharge of a cable installed on the path.

9. A data transmission device that is provided on a route of a moving body having a plurality of vehicles in a single formation, and transmits data to the moving body while the moving body is traveling on the route, Transmitting different data to a plurality of receiving units provided in each of the plurality of vehicles of the moving body; A data transmission device that transmits predetermined data to the receiving unit of one vehicle, and then transmits a retransmission of the predetermined data to the receiving unit of another vehicle.

10. A communication device that is provided in a moving body having a plurality of cars in a single formation, and receives data from a data transmission device provided on a route of the moving body while the moving body is traveling on the route, A plurality of receiving units provided in the plurality of vehicles, each receiving different data; a data synthesis unit that synthesizes the data received by each of the receiving units, the data being different from each other.

11. A communication method for transmitting data from a data transmission device installed on a route of a moving object having a plurality of vehicles in a single formation while the moving object is traveling on the route, comprising: a receiving step in which the plurality of vehicles each have a receiving unit for receiving the data transmitted from the data transmission device, the plurality of vehicles receiving information, and the plurality of vehicles combine the different data received by the receiving units; a transmitting step of transmitting different data to the receiving units of each of the plurality of vehicles based on the information.

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