Communication control system, communication control device, communication control program, and communication control method

Abstract

The objective is to provide a communication control system 100, a communication control device 60, a communication control program, and a communication control method that suppress congestion in inter-station vehicle communication using a private network established at Station 1. [Solution] The communication control system 100 comprises multiple ground stations 10, each installed at multiple stations 1 to establish a private network area 4 at each of the multiple stations 1; an onboard station 20 installed on a train 2 to transmit data between the ground stations 10 and the onboard station 20 using a private network; and a communication control device 60 that determines which stations the train 2 passes through and limits the bandwidth of data transmission between the ground stations 10 of the multiple ground stations 10 that the train passes through and the onboard station 20.

Description

Technical Field

[0001] The present disclosure relates to a communication control system, a communication control device, a communication control program, and a communication control method.

Background Art

[0002] Conventionally, a technique for performing data transmission between a train and the ground using a wireless communication device installed on the railway train and the ground (along the railway line, station platform, etc.) is known. For example, in Patent Document 1, a wireless communication system that performs data transmission and stop determination of a moving body using wireless communication between a ground wireless communication device (base station) installed on a station platform and an on-vehicle wireless communication device (on-vehicle station) installed on a train is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a wireless communication system such as Patent Document 1, when a train exists in a private line area constructed by a base station on a station platform, data transmission is performed between the base station and the on-vehicle station. Even when a train passes through the private line area, instantaneous data transmission is performed between the base station of the passing station and the on-vehicle station of the passing train. There has been a problem that congestion occurs in data transmission between the base station and the on-vehicle station using the private line, that is, in train-ground communication, due to this instantaneous data transmission.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a communication control system, a communication control device, a communication control program, and a communication control method that suppress congestion in train-ground communication using a private line constructed at a station.

Means for Solving the Problems

[0006] The communication control system described herein comprises multiple ground stations, each installed at multiple stations and establishing its own dedicated network area at each of the multiple stations; an on-board station installed on a train and performing data transmission with the ground stations using a dedicated network; and a communication control device that determines which stations the train will pass and limits the bandwidth of data transmission between the ground stations at the stations the train will pass and the on-board station.

[0007] The communication control device according to this disclosure comprises a calculation unit that determines which stations a train will pass through among a plurality of stations, a ground station at a passing station among a plurality of ground stations each installed at a plurality of stations and each establishing a private network area at a plurality of stations, and an on-board station installed on the train that transmits data to the ground station using a private network, and a transmission control unit that limits the bandwidth of the data transmission between the above stations.

[0008] The communication control program described herein provides a computer with a calculation function to determine which stations a train will pass through, and a transmission control function to limit the bandwidth of data transmission between a ground station at a passing station (among multiple ground stations, each installed at a station and each establishing its own network area) and an on-board station installed on the train that transmits data to the ground station using a private network.

[0009] The communication control method relating to this disclosure includes a calculation step of determining which stations a train will pass through among a plurality of stations, and a transmission control step of limiting the bandwidth of data transmission between a ground station at a passing station, among a plurality of ground stations each installed at a plurality of stations and each establishing a private network area at a plurality of stations, and an on-board station installed on the train that transmits data to the ground station using a private network. [Effects of the Invention]

[0010] According to the communication control system, communication control device, communication control program, and communication control method relating to this disclosure, it is possible to suppress congestion in inter-station vehicle communication using a private line constructed at a station. [Brief explanation of the drawing]

[0011] [Figure 1] This is an explanatory diagram showing an example of the overall configuration of a communication control system according to Embodiment 1 of this disclosure. [Figure 2] This is an explanatory diagram showing an example of the configuration of a communication control system at a train station according to Embodiment 1 of this disclosure. [Figure 3] This is a system block diagram of a communication control system according to Embodiment 1 of the present disclosure. [Figure 4] This is an explanatory diagram showing station location information according to Embodiment 1 of the present disclosure. [Figure 5] This is an explanatory diagram showing information on stations to be passed through according to Embodiment 1 of this disclosure. [Figure 6] This is a hardware configuration diagram showing a communication control device according to Embodiment 1 of the present disclosure. [Figure 7] This is a flowchart showing the communication control method according to Embodiment 1 of the present disclosure. [Figure 8] This is a flowchart showing a method for determining the direction of travel of a train according to Embodiment 1 of the present disclosure. [Figure 9] This flowchart shows the method for determining the train type according to Embodiment 1 of the present disclosure. [Figure 10] This is a flowchart showing the transmission control method according to Embodiment 1 of the present disclosure. [Modes for carrying out the invention]

[0012] Hereinafter, examples of communication control devices, communication control programs, communication control systems, and communication control methods relating to this disclosure will be described with reference to the drawings. In the drawings, identical or corresponding parts will be given the same reference numeral, and their descriptions will be omitted without repetition.

[0013] Embodiment 1. First, the communication control system 100 according to Embodiment 1 of this disclosure will be described with reference to Figure 1. Figure 1 is an explanatory diagram showing an example of the overall configuration of the communication control system 100. In Figure 1, wired connections between devices are indicated by solid arrows, and wireless connections are indicated by solid arrows.

[0014] The communication control system 100 is a system that controls train-ground communication using dedicated lines. Specifically, the communication control system 100 controls data transmission using dedicated lines between the ground station 10 installed at station 1 and the on-board station 20 installed on train 2.

[0015] As shown in FIG. 1, the communication control system 100 includes a plurality of ground stations 10, on-board stations 20, a plurality of ground devices 30, on-board devices 40, a device control device 50, a ground communication control device 60, and an on-board communication control device 70. As shown in FIG. 1, the ground stations 10 and the ground devices 30 are respectively installed at a plurality of stations 1. The device control device 50 and the ground communication control device 60 are installed at one or more locations on route 3 including a plurality of stations 1. Also, the on-board station 20, the on-board devices 40, and the on-board communication control device 70 are installed for each train 2. Here, FIG. 1 illustrates the communication control system 100 in a partial section of route 3 including two stations 1a and 1b. For this reason, in FIG. 1, two ground stations 10a and 10b and two ground devices 30a and 30b are illustrated as the ground stations 10 and the ground devices 30 respectively installed at the two stations 1a and 1b.

[0016] The plurality of ground stations 10a and 10b are wireless communication devices respectively installed at the plurality of stations 1a and 1b. The plurality of ground stations 10a and 10b each include antennas 11a and 11b. The plurality of ground stations 10a and 10b construct dedicated line wireless communication areas (hereinafter referred to as dedicated line areas 4 (4a, 4b)) at the plurality of stations 1a and 1b respectively by the plurality of antennas 11a and 11b. Here, the dedicated line is a line that is not a public network, such as local 5G, sXGP (shared Xtended Global Platform), train radio, in-house wireless LAN, and millimeter wave line.

[0017] When the train 2 stops at the station 1a, the on-vehicle station 20 installed on the train 2 is installed so that it can enter the private line area 4a. In FIG. 1, an example in which the private line area 4 is constructed as part of the station 1 is shown. Note that the private line area 4 constructed by the ground station 10 may be constructed throughout the station 1.

[0018] Also, in FIG. 1, an example in which one ground station 10 is installed for each station 1 is shown, but it is not limited to this. A plurality of ground stations 10 may be installed for each station 1.

[0019] The on-vehicle station 20 is a wireless communication device installed on the train 2. When the train 2 enters the private line area 4, data transmission using the private line is performed between the on-vehicle station 20 and the ground station 10. That is, as shown in FIG. 1, when the train 2 is within the private line area 4a of the station 1a among the two stations 1a and 1b, the on-vehicle station 20 is the ground station 10a that constructs the private line area 4a where the train 2 is located among the plurality of ground stations 10a and 10b (hereinafter referred to as the first ground station 10a). ) for data transmission using the private line. Specifically, wireless communication using the private line resources between the first ground station 10a and the on-vehicle station 20 becomes possible via the antenna 11a of the first ground station 10a and the antenna 21 provided in the on-vehicle station 20.

[0020] Note that in FIG. 1, an example in which one on-vehicle station 20 is installed for each train 2 is shown, but it is not limited to this. A plurality of on-vehicle stations 20 may be installed for each train 2. Also, the installation position of the on-vehicle station 20 is not particularly limited, and it may be provided in front of the train 2 or behind the train 2.

[0021] When the train 2 is within the private line area 4a of the station 1a, in the data transmission using the private line between the first ground station 10a and the on-vehicle station 20, the data output from the ground device 30a installed in the station 1a or the on-vehicle device 40 installed in the train 2 is transmitted.

[0022] As shown in Figure 1, multiple ground devices 30a and 30b are installed at multiple stations 1a and 1b, respectively, and are each connected to multiple ground stations 10a and 10b in a communicative manner. In detail, the multiple ground devices 30a and 30b are each connected to multiple ground stations 10a and 10b in a communicative manner via a wired connection between an equipment control device 50 and a ground communication control device 60. Therefore, the multiple ground devices 30a and 30b can transmit the data they output to the multiple ground stations 10a and 10b via wired connections through the equipment control device 50 and the ground communication control device 60. Then, when train 2 is located in the private network area 4a of station 1a, and wireless communication using the private network resources between the first ground station 10a and the onboard station 20 is possible, the data output by the ground equipment 30a installed at station 1a and transmitted via wire to the first ground station 10a is transmitted from the first ground station 10a to the onboard station 20.

[0023] As shown in Figure 1, the onboard equipment 40 is installed on each train 2 and is communicated with the onboard station 20. More specifically, the onboard equipment 40 is communicated with the onboard station 20 via a wired onboard communication control device 70. Therefore, the onboard equipment 40 can transmit data it outputs to the onboard station 20 via wired connection through the onboard communication control device 70. When train 2 is located in the private network area 4a of station 1a and wireless communication using the private network resources between the first ground station 10a and the onboard station 20 is possible, the data output by the onboard equipment 40 and transmitted via wired connection to the onboard station 20 is then transmitted from the onboard station 20 to the first ground station 10a.

[0024] Data transmission of data output by ground equipment 30a or onboard equipment 40 between the first ground station 10a and the onboard station 20 is controlled by the equipment control device 50.

[0025] The equipment control device 50 is wired and communicatively connected to multiple ground devices 30a and 30b installed at multiple stations 1a and 1b, respectively, and to the ground communication control device 60. Specifically, the equipment control device 50 is an application server that is placed between the multiple ground devices 30a and 30b and the ground communication control device 60, and centrally manages the multiple ground devices 30a and 30b. The equipment control device 50 controls data transmission from one of the ground equipment 30 and the on-board equipment 40 to the other via the ground station 10 and the on-board station 20. Data transmission between the ground equipment 30 and the on-board equipment 40 by the equipment control device 50 enables the ground equipment 30 and the on-board equipment 40 to operate in coordination.

[0026] In detail, the equipment control device 50 controls the multiple ground devices 30a, 30b and the on-board equipment 40 to transmit data from one of the multiple ground devices 30a, 30b, which are connected to the first ground station 10a, to the other via wireless communication using a private line resource between the first ground station 10a and the on-board station 20. When the equipment control device 50 controls data transmission from the ground device 30a to the on-board equipment 40, the equipment control device 50 receives the data output by the ground device 30a via a wired connection and transmits data corresponding to the data output by the ground device 30a to the on-board equipment 40 via the first ground station 10a and the on-board station 20. When the equipment control device 50 controls the transmission of data from the on-board equipment 40 to the ground equipment 30a, the equipment control device 50 wirelessly receives the data output by the on-board equipment 40 via the first ground station 10a and the on-board station 20, and transmits data corresponding to the data output by the on-board equipment 40 to the ground equipment 30a via the first ground station 10a and the on-board station 20. Here, the equipment control device 50 may transmit the data output by one of the ground equipment 30 and the on-board equipment 40 as is to the other, or it may output a control signal to the other based on the data output by one.

[0027] Here, an example of data transmission control by the equipment control device 50 will be explained using Figure 2. Figure 2 is an explanatory diagram showing an example configuration of the communication control system 100 at station 1a. In detail, Figure 2 illustrates a state in which a train 2a stopping at station 1a and a train 2b passing through station 1a are both within the station 1a's private network area 4a. Here, station 1a is a railway station with two tracks (hereinafter referred to as tracks) facing one platform, allowing passing trains to wait. In Figure 2, wired connections between devices are indicated by solid arrows, and wireless connections are indicated by solid arrows.

[0028] Figure 2 shows a surveillance camera 31 as an example of ground equipment 30, an onboard monitor 41 as an example of onboard equipment 40, and a platform surveillance video transmission device 51 as an example of equipment control device 50. The surveillance camera 31 is a device installed on the station platform to capture platform surveillance video. The surveillance camera 31 is installed so that platform surveillance video can be captured for each track. The onboard monitor 41 is a monitor installed on the train. The platform surveillance video transmission device 51 is a device that controls the transmission of platform surveillance video data from the surveillance camera 31 to the onboard monitor 41 via the first ground station 10a and the onboard station 20. The driver 5 can safely open and close the doors of the train 2 by checking the platform surveillance video captured by the surveillance camera 31 and transmitted by the platform surveillance video transmission device 51 on the onboard monitor 41.

[0029] The platform monitoring video transmission device 51 transmits platform monitoring video data for the platform where train 2 is stopped at a station 1 with multiple tracks. Specifically, at a station 1a with multiple tracks as shown in Figure 2, the platform monitoring video transmission device 51 identifies the platform that train 2a entered when train 2a is below a predetermined speed and controls the transmission of platform monitoring video data for the identified platform. Here, the predetermined speed is a speed set in advance and is lower than the speed at which train 2b passes through station 1a. If train 2b passes through station 1a with multiple tracks, that is, if train 2b is not below the predetermined speed, the platform monitoring video transmission device 51 does not identify the platform that train 2b entered, and no platform monitoring video data is transmitted.

[0030] In other words, the platform monitoring video transmission device 51 is a device that controls data transmission to occur only when train 2 is stopped. Here, "when train 2 is stopped" refers to the period from when train 2 decelerates to below a predetermined speed in order to stop at station 1, until it accelerates to above a predetermined speed in order to depart from station 1 after stopping.

[0031] In addition to the surveillance camera 31, the onboard monitor 41, and the platform surveillance video transmission device 51, the communication control system 100 includes a plurality of ground devices 30 (not shown), a plurality of onboard devices 40, and a plurality of device control devices 50. The plurality of device control devices 50 include devices that control data transmission only when the train 2 is stopped, like the platform surveillance video transmission device 51 (hereinafter referred to as the determination device control device), and devices that control data transmission when the train 2 is passing through and when it is stopped.

[0032] Another example of a control device for judgment equipment used in the home monitoring video transmission device 51 is a door control device. The door control device is a device for opening and closing platform doors installed on the platform in response to the opening and closing of the doors of train 2 when train 2 is stopped. The door control device controls the transmission of a platform door opening / closing request signal from the doors of train 2, which are on-board equipment 40, to the platform doors, which are ground equipment 30, via the first ground station 10a and the on-board station 20, to open and close the platform doors installed on the platform in response to the opening and closing of the doors of train 2. Examples of equipment control devices 50 that control data transmission when train 2 passes and when it stops include a train vision advertising data transmission device, an in-car surveillance video transmission device, and a vehicle equipment log transmission device. The train vision advertising data transmission device controls the transmission of train vision advertisements from the ground equipment 30, which is a train vision advertising data storage device, to the on-board equipment 40, which is a train vision monitor. The in-car surveillance video transmission device controls the transmission of in-car surveillance video from the on-board equipment 40, which is an in-car camera, to the ground equipment 30, which is a ground monitor. The vehicle equipment log transmission device controls the transmission of vehicle equipment logs from the on-board equipment 40 to the ground equipment 30, which is a vehicle equipment management device.

[0033] Specifically, when train 2a is stopped at station 1a, platform monitoring video, platform door opening / closing request signals, advertising data for train vision, in-car monitoring video, and vehicle equipment logs are transmitted between the ground station 10a and the on-board station 20a via a private line, controlled by a plurality of equipment control devices 50, including the judgment equipment control device. When train 2b is passing through station 1a, advertising data for train vision, in-car monitoring video, and vehicle equipment logs are transmitted between the ground station 10a and the on-board station 20a via a private line, controlled by a plurality of equipment control devices 50, excluding the judgment equipment control device.

[0034] When train 2b is passing through station 1a, the onboard station 20b temporarily resides in the private network area 4a. The time during which data transmission is possible when passing through station 1a is shorter than when the train is stopped, and the train may leave the private network area 4a before data transmission is complete. If the train leaves the private network area 4a before data transmission is complete, the data will be retransmitted, and the private network resources at station 1a will be consumed unnecessarily. Continued consumption of extra resources due to retransmissions will cause congestion in inter-train communication using the private network, leading to increased data transmission delays and packet loss, creating a vicious cycle where further retransmissions are necessary. Furthermore, when train 2b passes through station 1a, it uses the private network resources, which reduces the private network resources available to train 2a, which is stopped at station 1a, for transmitting platform monitoring video. The limited private network resources are used simultaneously by multiple trains, causing congestion in inter-train communication using the private network. As a result, train 2a, which is stopped at station 1a, lacks the transmission capacity to transmit data within its short stopping time, leading to a decrease in transmission speed. Thus, in order to suppress congestion caused by the consumption of private line resources through inter-station communication using a private line between passing stations and passing trains, the communication control system 100 uses a ground communication control device 60 to limit the bandwidth of data transmission using a private line between the ground station 10 at a passing station and the on-board station 20 of train 2.

[0035] As shown in Figure 1, the ground communication control device 60 is wired and communicatively connected to multiple ground stations 10a, 10b and equipment control devices 50. Therefore, the ground communication control device 60 can understand the content of data transmitted from one of the ground equipment 30 and the onboard equipment 40 to the other via the ground station 10 and the onboard station 20, under the control of the equipment control device 50. Based on the data transmission history between the ground station 10 and the onboard station 20 controlled by the equipment control device 50, the ground communication control device 60 determines the stations that train 2 will pass through and limits the bandwidth of data transmission using a private line between the ground station 10 at the passing station and the onboard station 20 of train 2.

[0036] The configuration of the ground communication control device 60 will be explained using Figure 3. Figure 3 is a system block diagram of the communication control system 100. As shown in Figure 3, the ground communication control device 60 includes a data transmission unit 61, a data identification unit 62, a storage unit 63, a calculation unit 64, and a transmission control unit 65.

[0037] The data transmission unit 61 performs data transmission between the ground station 10 and the equipment control device 50. More specifically, the data transmission unit 61 performs data transmission between the first ground station 10a, which is the ground station 10 that constructs the private network area 4 in which the train 2 is located, and the equipment control device 50. The data transmitted between the first ground station 10a and the equipment control device 50 is data that is transmitted from one of the ground equipment 30 and the onboard equipment 40 to the other via the first ground station 10a and the onboard station 20, under the control of the equipment control device 50. Therefore, the data transmission unit 61 can monitor the data transmitted between the first ground station 10a and the equipment control device 50 and obtain a history of data transmission between the first ground station 10a and the onboard station 20 controlled by the equipment control device 50. Specifically, the data transmission unit 61 acquires history information indicating the history of data transmission between the on-board station 20 and multiple first ground stations 10a, as a history of data transmission between the first ground station 10a and the on-board station 20 controlled by the equipment control device 50. The history information includes the data transmitted by data transmission, the identification numbers of the on-board station 20, the first ground station 10a, and the equipment control device 50 that performed the data transmission, and the time at which the data transmission took place. The history information acquired by the data transmission unit 61 is output to the data identification unit 62.

[0038] The data identification unit 62 acquires history identification information for each first ground station 10a and equipment control device 50 that performed data transmission, based on the history information of the on-board station 20 acquired by the data transmission unit 61. The data identification unit 62 identifies the history information of the on-board station 20 for each first ground station 10a and equipment control device 50 based on the identification number of the on-board station 20, the identification number of each first ground station 10a, and the identification number of the equipment control device 50 included in the history information. Specifically, the identification numbers include the train identification number, the MAC address (Media Access Control address) of the equipment, the IP address (Internet Protocol Address), the SIM card number, and the SIM card subscriber identification number (IMSE: International Mobile Subscriber Identity). The history identification information acquired by the data identification unit 62 is output to the calculation unit 64.

[0039] The memory unit 63 stores communication control programs necessary to realize each function of the ground communication control device 60, as well as station location information and information on stations scheduled to be passed, which the ground communication control device 60 uses to determine which stations the train 2 will pass through.

[0040] The communication control program is a program that causes a computer to function as a ground communication control device 60 according to Embodiment 1 and to execute the communication control method according to Embodiment 1. In detail, the communication control program enables the computer to perform calculation functions to determine which stations the train 2 will pass through among a plurality of stations 1, and to perform transmission control functions to limit the bandwidth of data transmission between a plurality of ground stations 10, each installed at a plurality of stations 1, which each establishes a private line area 4 at a plurality of stations 1, and an onboard station 20 installed on the train 2 that performs data transmission with the ground stations 10 using a private line.

[0041] Station location information is information that shows the positional relationships of multiple stations 1 on line 3. Figure 4 shows an example of station location information. Line 3 in Figure 4 has nine stations arranged alphabetically from station A to station I, and there is an up line that proceeds from station A towards station I and a down line that proceeds from station I towards station A.

[0042] The scheduled passing information shows the stations that train 2 is scheduled to pass through for each train type. The type of train 2 is a classification based on the train's operating speed and the number of stops it makes, such as local trains, express trains, and limited express trains. A local train is a train 2 that stops at all stations 1, an express train is a train 2 that stops only at major stations 1 and reaches its destination faster than a local train, and a limited express train is a train 2 that stops at even fewer stations 1 than an express train and reaches its destination faster than an express train.

[0043] Figure 5 shows examples of station information for local, express, and limited express trains. As shown in Figure 5, local trains stop at all stations 1 from A to I, and have no stations they are scheduled to pass through. Express trains are scheduled to pass through stations B, D, F, and H. Limited express trains are scheduled to pass through stations E and G in addition to the stations that express trains are scheduled to pass through. Thus, the stations that trains are scheduled to pass through differ for each type of train 2, and the memory unit 63 stores the stations that trains are scheduled to pass through for each type of train 2 in advance as scheduled passing information.

[0044] The calculation unit 64 determines which stations train 2 will pass through from among multiple stations 1. In detail, the calculation unit 64 first determines the direction of travel of the train, then uses the result of the direction of travel determination to determine the type of train, and then determines which stations to pass through based on the scheduled passing station information that indicates the stations that each type of train is scheduled to pass through. The following will explain in detail each determination made by the calculation unit 64.

[0045] First, let's explain how the calculation unit 64 determines the direction of travel of the train. The calculation unit 64 determines the direction of travel of train 2 based on the station location information stored in the memory unit 63 and the history identification information acquired by the data identification unit 62. Specifically, the calculation unit 64 determines whether or not data transmission has been performed between the onboard station 20 of train 2 and multiple ground stations 10 installed at multiple stations 1 on the line 3 using a private line, and then determines the direction of travel of train 2 by extracting the ground stations 10 to which the onboard station 20 transmitted data in chronological order.

[0046] The data transmission history using the private line between the ground station 10 and the onboard station 20 indicates whether train 2 stopped at station 1 or passed through station 1. The calculation unit 64 then extracts the ground station 10 (first ground station) from which train 20 transmitted data, based on the history identification information acquired by the data identification unit 62, and determines that the station 1 where the extracted ground station 10 (first ground station) is located is the station 1 that train 2 stopped at or passed through. The information of the station 1 that train 20 stopped at or passed through, along with the order in which they stopped or passed, is output. The calculation unit 64 then determines the direction of travel of train 20 based on the information of the station 1 that train 20 stopped at or passed through, the order in which they stopped or passed, and the station location information.

[0047] Next, the determination of the train type by the calculation unit 64 will be explained. The calculation unit 64 then determines the type of train 2 based on the direction of travel of train 2 determined by the calculation unit 64, the history identification information acquired by the data identification unit 62, and the information of stations to be passed that is stored in the storage unit 63. Specifically, the calculation unit 64 determines whether any of the multiple stations 1 located in the direction of travel of train 2 determined by the calculation unit 64 are stations where the onboard station 20 stops or stations where the train passes, and then determines the type of train 2 based on the determination results of whether the stations are stops or stations where the train passes and the information of stations to be passed.

[0048] Let's explain the determination of the train type in more detail. First, the calculation unit 64 extracts multiple stations 1 located in the direction of travel of train 2, based on the direction of travel of train 2 determined by the calculation unit 64. Next, the calculation unit 64 determines, based on the history identification information, whether or not the onboard station 20 transmitted data to the multiple ground stations 10 installed at the multiple stations 1 located in the direction of travel of train 2. As described above, the station 1 where the ground station 10 (first ground station) from which the onboard station 20 transmitted data is installed is determined to be a station where train 2, on which the onboard station 20 is installed, stopped or passed through.

[0049] Next, the calculation unit 64 determines, based on the data transmission history identification information controlled by the platform monitoring video transmission device 51, whether or not data transmission controlled by the onboard station 20 and the platform monitoring video transmission device 51 has been performed to the ground station 10 (first ground station) of station 1, which is located in the direction of travel of train 2 and has been determined to be a station where train 2 stops or passes through. As mentioned above, the platform monitoring video transmission device 51 is an example of the equipment control device 50, and is a determination equipment control device that transmits data only when the train is stopped. Therefore, if data transmission controlled by the platform monitoring video transmission device 51 is performed between the on-board station 20 and the first ground station 10a, it can be determined that the train 2 on which the on-board station 20 is installed has stopped at station 1a on which the first ground station 10a is installed. The calculation unit 64 then determines, based on the history identification information of the platform monitoring video transmission device 51, whether or not data transmission controlled by the platform monitoring video transmission device 51 has been performed to the ground station 10 of station 1 which is located in the direction of travel of the train 2 and has been determined to have already stopped or passed. The calculation unit 64 determines that the station 1 on which data transmission controlled by the platform monitoring video transmission device 51 was performed is a stopping station, and the station 1 on which it was not performed is a passing station. The calculation unit 64 then determines the type of train 2 based on the determination result of whether the on-board station 20 is a stopping station or a passing station, and the passing station information which indicates the stations that the train 2 is scheduled to pass for each type of train 2. The calculation unit 64 continues to determine whether the onboard station 20 is a stopping station or a passing station for the ground station 10 of station 1 which has been determined to have been stopped or passed by, until the determination of the type of train 2 is completed.

[0050] In the above example, the type of train 2 is determined based on the history identification information of the platform monitoring video transmission device 51, but this is not the only example. The device control device 50 used to determine the type of train 2 can be any determination device control device that is predetermined to transmit data only when train 2 is stopped. For example, instead of the platform monitoring video transmission device 51, a door control device that opens and closes platform doors installed on the platform in response to the opening and closing of train 2's doors may be used only when train 2 is stopped.

[0051] Furthermore, although the above describes an example in which the calculation unit 64 determines whether or not data transmission controlled by the determination device control device has been performed based on the history identification information of the determination device control device, and determines that station 1 where data transmission was performed is a stopping station and station 1 where it was not performed is a passing station, it is not limited to this. The calculation unit 64 may also determine a passing station based on the history identification information of any of the device control devices 50, including the determination device control device, whether or not data transmission controlled by the device control device 50 has been performed, and the period during which data transmission controlled by the device control device 50 was performed. The period during which data transmission is performed differs depending on whether train 2 stops at station 1 or passes through station 1, because the period during which train 2 is within the private network area 4 of station 1 differs. When train 2 passes through station 1, the period during which data transmission is performed is shorter than when train 2 stops at station 1. Therefore, the calculation unit 64 may determine that station 1 where the data transmission was performed is a stop station if the period during which the data transmission controlled by the equipment control device 50 was performed is equal to or greater than a predetermined threshold, and may determine that station 1 where the data transmission was performed is a pass-through station if the period is less than a predetermined threshold.

[0052] Finally, the calculation unit 64 determines the stations that train 2 will pass through based on the train type and the information of stations it is scheduled to pass through. More specifically, the calculation unit 64 determines the stations that train 2 will pass through after the train type has been determined. For example, if train 2 is an express train, the information of stations it is scheduled to pass through is as shown in Figure 5, and train 2 has passed through stations A to C before the train type determination is completed, the calculation unit 64 determines that the stations that train 2 will pass through after the train type determination are stations D, F, and H. The above describes in detail each of the decisions made by the arithmetic unit 64.

[0053] Returning to Figure 3, the transmission control unit 65 limits the bandwidth of data transmission between the ground stations 10 at the stations through which train 2 passes, as determined by the calculation unit 64, and the onboard stations 20 of train 2. For example, if the calculation unit 64 determines that the stations through which train 2 passes are stations B, D, F, and H, the transmission control unit 65 limits the bandwidth of data transmission between the multiple ground stations 10 installed at stations B, D, F, and H, respectively, and the onboard stations 20 of train 2. Specifically, the transmission control unit 65 outputs communication control information to the equipment control device 50. The communication control information includes information about the ground stations 10 and onboard stations 20 that are subject to data transmission bandwidth limiting, and the transmission control unit 65 limits the bandwidth of data transmission using the private line between the ground stations 10 and onboard stations 20, as included in the communication control information, by flow control. Due to the bandwidth limiting, even if a data request signal is sent to the equipment control device 50, there will be no ACK response, and the amount of data transmitted between the ground stations 10 and onboard stations 20, output by the ground equipment 30 or onboard equipment 40, is limited.

[0054] As described above, the ground communication control device 60 limits the bandwidth of data transmission using the private line between the ground station 10 at the passing station and the onboard station 20 of the train 2. Therefore, the ground communication control device 60 can reduce the consumption of private line resources by data transmission using the private line between the ground station 10 at the passing station and the onboard station 20 of the train 2, and can suppress congestion in inter-station communication using the private line established at the station.

[0055] Furthermore, the ground communication control device 60 determines the stations to be passed based on the type of train 2 determined from the data transmission history and the information of stations to be passed for each type of train 2, and limits the bandwidth of data transmission between the ground station 10 at the passing station and the onboard station 20 of train 2.Therefore, the ground communication control device 60 can determine the stations to be passed and limit the bandwidth without connecting to existing systems that can acquire information on stations to be passed in real time, such as operation management systems that monitor and centrally control the operation status of trains.In addition, since the ground communication control device 60 does not connect to existing systems, it can limit the bandwidth of data transmission between the ground station 10 at the passing station and the onboard station 20 of train 2 without being affected by modifications to existing systems.

[0056] It is desirable for the transmission control unit 65 to limit the bandwidth of data transmission between the ground station 10 and the onboard station 20 at passing stations controlled by the equipment control devices 50, excluding the platform surveillance video transmission device 51, among the multiple equipment control devices 50. When train 2 is in operation, if an express or limited express train makes an emergency stop at a station it is scheduled to pass through, it is necessary to transmit platform surveillance video data from the surveillance camera 31 to the onboard monitor 41 by controlling the platform surveillance video transmission device 51. By not selectively limiting the data transmission of the platform surveillance video transmission device 51, which is an equipment control device 50 that requires data transmission when the train is stopped, it is possible to respond to emergency stops of train 2 that are not scheduled.

[0057] Furthermore, after the transmission control unit 65 has applied bandwidth restrictions to the equipment control devices 50 excluding the platform monitoring video transmission device 51, it is desirable that the transmission control unit 65 releases the bandwidth restrictions applied to the other equipment control devices 50 when data transmission by the platform monitoring video transmission device 51 occurs at a passing station. Specifically, it is desirable that the calculation unit 64 determines the ground station 10 (hereinafter referred to as the second ground station) of the passing station where data transmission controlled by the platform monitoring video transmission device 51 has occurred. In addition, it is desirable that the transmission control unit 65 releases the bandwidth restrictions on data transmission between the second ground station and the onboard station 20 controlled by the equipment control devices 50, excluding the platform monitoring video transmission device 51. Here, the equipment control devices 50 excluding the platform monitoring video transmission device 51 include, for example, the door control device, the advertising data transmission device for train vision, the in-car monitoring video transmission device, and the vehicle equipment log transmission device. Based on the status of data transmission by the home monitoring video transmission device 51, the bandwidth restrictions imposed on the equipment control devices 50 excluding the home monitoring video transmission device 51 are lifted. This makes it possible to transmit data using the private network by multiple equipment control devices 50, including the home monitoring video transmission device 51, even in the event of an unexpected emergency stop by train 2.

[0058] The above describes a method using the platform monitoring video transmission device 51 to respond to unexpected emergency stops of train 2, but it is not limited to this. The device control device 50 used to determine whether or not to release the bandwidth restriction can be any determination device control device that is predetermined to transmit data only when train 2 is stopped. For example, instead of the platform monitoring video transmission device 51, a door control device that opens and closes platform doors installed on the platform in response to the opening and closing of train 2's doors may be used only when train 2 is stopped.

[0059] Next, the hardware configuration of the ground communication control device 60 according to this embodiment 1 will be described using Figure 6. Figure 6 is a hardware configuration diagram of the ground communication control device 60.

[0060] As shown in Figure 6, the ground communication control device 60 consists of a computing device 601, a storage device 602, an auxiliary storage device 603, and a communication device 604. The computing device 601, storage device 602, auxiliary storage device 603, and communication device 604 are connected via a signal line 605.

[0061] The arithmetic unit 601 is a device that implements the functions of the data identification unit 62, the calculation unit 64, and the transmission control unit 65 shown in Figure 3. The arithmetic unit 601 implements the functions of the data identification unit 62, the calculation unit 64, and the transmission control unit 65 of the ground communication control device 60 by reading the necessary program from the auxiliary storage device 603 and executing the processing. The arithmetic unit 601 is, for example, a processor, and a processor is an IC (Integrated Circuit) that performs arithmetic processing. Specific examples of processors include, for example, a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and a GPU (Graphics Processing Unit). Alternatively, the arithmetic unit 601 may be a personal computer, a microcontroller board, or an FPGA (Field Programmable Gate Array) board.

[0062] The storage device 602 is the main memory of the ground communication control device 60. The main memory temporarily stores the calculations performed by the arithmetic unit 601. The storage device 602 is, for example, RAM (Random Access Memory).

[0063] The auxiliary storage device 603 is the storage unit 63 shown in Figure 3, and is an auxiliary storage device for the ground communication control device 60. The auxiliary storage device 603 stores communication control programs necessary to realize each function of the ground communication control device 60, and information that the ground communication control device 60 uses to determine which stations train 2 will pass through, such as information on stations to be passed and station location information. The auxiliary storage device 603 is, for example, a ROM (Read Only Memory), an HDD (Hard Disk Drive), or an SSD (Solid State Drive).

[0064] The communication device 604 is the data transmission unit 61 shown in Figure 3, and is the transmitter and receiver of the ground communication control device 60.

[0065] Signal line 605 is a transmission path for sending and receiving data between the components shown in Figure 3.

[0066] <Communication control method of Embodiment 1> Next, the procedure of the communication control method according to Embodiment 1 will be explained using Figures 7 and 10. Figure 7 is a flowchart showing the communication control method, Figure 8 is a flowchart showing the method for determining the direction of travel of the train, Figure 9 is a flowchart showing the method for determining the type of train, and Figure 10 is a flowchart showing the transmission control method.

[0067] As shown in Figure 7, the communication control method according to Embodiment 1 includes a calculation step and a transmission control step. In the calculation step, first the direction of travel of the train is determined (step S100), and the train type is determined using the result of the direction of travel determination (step S200), thereby determining which stations the train 2 will pass through among the multiple stations 1. In the transmission control step, bandwidth limiting is performed on data transmission between the ground station 10 of the stations the train 2 will pass through, which are determined in the calculation step, and the onboard station 20 installed on the train 2 that transmits data between the train and the ground station 10 using a private line (step S300).

[0068] First, the determination of the train's direction of travel (step S100) will be explained using Figure 8. As mentioned above, the determination of the train's direction of travel is performed by the calculation unit 64 based on station location information and history identification information. Here, in the following explanation, it is assumed that train 2 departed from station C. The station location information is as shown in Figure 4, and the line on which train 2 travels has nine stations arranged alphabetically from station A to station I, and is a line with an up direction that proceeds from station A towards station I and a down direction that proceeds from station I towards station A. That is, based on the station location information, if the direction of travel of train 2 is up, the next station is station D, and if the direction of travel of train 2 is down, the next station is station B.

[0069] As shown in Figure 8, first, at station C, the departure station, data transmission is performed using a private line between the ground station 10 at station C and the onboard station 20 of train 2, and this is recorded as history identification information by the data identification unit 62 (step S101). Once the data transmission between the ground station 10 at station C and the onboard station 20 of train 2 is completed, the calculation unit 64 uses the history identification information to determine whether or not data transmission has taken place between the ground station 10 at station D, a candidate for the next station, and the onboard station 20 of train 2 (step S102). If data transmission has taken place between the ground station 10 at station D and the onboard station 20 of train 2 (Yes in step S102), the calculation unit 64 determines that the direction of travel of train 2 is in the up direction (step S103). In detail, the calculation unit 64 determines that the onboard station of train 2 is within the private network area 4 established by the ground station 10 at station D, that is, that train 2 has stopped at or passed through station D, and that the next station for train 2, which departed from station C, is station D, and that the direction of travel for train 2 is in the up direction. If no data transmission occurred between the ground station 10 at station D and the onboard station 20 of train 2 (No in step S102), the calculation unit 64 uses the history identification information to determine whether or not data transmission occurred between the ground station 10 at station B, another candidate for the next station, and the onboard station 20 of train 2 (step S104). If data transmission occurred between the ground station 10 at station B and the onboard station 20 of train 2 (Yes in step S104), the calculation unit 64 determines that train 2 has stopped at or passed through station B, and that the direction of travel for train 2 is in the down direction (step S105). If no data transmission occurred between the ground station 10 at station B and the onboard station 20 of train 2 (No. in step S104), the calculation unit 64 determines that train 2 neither stopped at nor passed through either station B or station D, and repeats the determination process from step S102.

[0070] Next, the determination of the train type (step S200) will be explained using Figure 9. As mentioned above, the determination of the train type is performed by the calculation unit 64 based on the determination result of the train's direction of travel, history identification information, and information on stations to be passed. Here, in the following explanation, it is assumed that train 2 departs from station C and either stops at station D or passes through station D. That is, the direction of travel of the train is in the up direction, and the flow described below is assumed to be a continuation of step S103. Also, the information on stations to be passed is as shown in Figure 5, and there are three train types: local train, express train, and limited express train. The next stop after departure from station C is station D if train 2 is a local train, station E if it is an express train, and station G if it is a limited express train.

[0071] As shown in Figure 9, first, the calculation unit 64 determines whether or not data transmission controlled by the platform monitoring video transmission device 51 has taken place between the ground station 10 at station D and the onboard station 20 of train 2 (step S201). If data transmission controlled by the platform monitoring video transmission device 51 has taken place between the ground station 10 at station D and the onboard station 20 of train 2 (Yes in step S201), the calculation unit 64 determines that the type of train 2 is a local train based on the information of stations to be passed (step S202). Then, based on the type of train 2 and the information of stations to be passed, the calculation unit 64 determines that there are no stations that train 2, being a local train, will pass through (step S203).

[0072] If data transmission controlled by the platform monitoring video transmission device 51 is not taking place between the ground station 10 at station D and the onboard station 20 of train 2 (No. in step S201), the calculation unit 64 determines that train 2 has passed station D and determines whether data transmission has taken place between the ground station 10 at station E, which is the next station after station D, and the onboard station 20 of train 2 (step S204). If data transmission has taken place between the ground station 10 at station E and the onboard station 20 of train 2 (Yes in step S204), the calculation unit 64 determines that train 2 has either stopped at station E or passed through station E, and proceeds to step S205. If data transmission has not taken place between the ground station 10 at station E and the onboard station 20 of train 2 (No. in step S204), the calculation unit 64 determines that train 2 has neither stopped at nor passed through station E, and repeats the determination in step S204 until data transmission at station E is confirmed. In step S205, which is the process after it has been determined whether train 2 will stop at or pass through station E, the calculation unit 64 determines whether data transmission controlled by the platform monitoring video transmission device 51 has taken place between the ground station 10 at station E and the onboard station 20 of train 2. If data transmission controlled by the platform monitoring video transmission device 51 has taken place between the ground station 10 at station E and the onboard station 20 of train 2 (Yes in step S205), the calculation unit 64 determines that the type of train 2 is an express train based on the information of stations it is scheduled to pass through (step S206). Then, based on the type of train 2 and the information of stations it is scheduled to pass through, the calculation unit 64 determines that the stations that train 2, being an express train, will pass through are stations F and H (step S207).

[0073] If data transmission controlled by the platform monitoring video transmission device 51 is not taking place between the ground station 10 at station E and the onboard station 20 of train 2 (No. in step S205), the calculation unit 64 determines that train 2 has passed through station E and determines that the type of train 2 is an express train based on the information of stations to be passed (step S208). Then, based on the type of train 2 and the information of stations to be passed, the calculation unit 64 determines that the stations that train 2, being an express train, will pass through are stations F, G, and H (step S209).

[0074] The above example illustrates how the types of three trains (trains 2) can be determined by checking two stations (station 1). However, depending on the relationship between the train type and the stations it is scheduled to pass through, it may not be possible to determine the train type using only two stations (station 1). In this case, the checks for each station (station 1) are continued until the train type can be determined.

[0075] The transmission control (step S300) will be explained using Figure 10. The transmission control step is performed by the calculation unit 64 and the transmission control unit 65. Here, the flow described below is assumed to be a continuation of step S207, in which it was determined that the type of train 2 is an express train and that the stations to be passed are F station and H station.

[0076] As shown in Figure 10, the transmission control unit 65 limits the bandwidth of data transmission controlled by the equipment control devices 50, excluding the platform monitoring video transmission device 51, between the ground stations 10 at stations F and H, which are stations that the express train passes through, and the onboard station 20 of the express train 2 (step S301). As a result of step S301, the data transmission controlled by the equipment control devices 50, excluding the platform monitoring video transmission device 51, is limited between the express train 2 and stations F and H, which are stations that the express train passes through, but the data transmission controlled by the platform monitoring video transmission device 51 is not limited. Therefore, the calculation unit 64 determines whether or not data transmission controlled by the platform monitoring video transmission device 51 is taking place between the ground stations 10 at stations F and H, which are stations that the express train passes through, and the onboard station 20 of the express train 2 (step S302). In other words, the calculation unit 64 determines whether the ground stations 10 at stations F and H, which are stations that the express train passes through, are the second ground stations 10 at the stations through which data transmission controlled by the platform monitoring video transmission device 51 took place. If the ground stations 10 at stations F and H, which are stations that the express train passes through, are the second ground stations (Yes in step S302), the calculation unit 64 determines that train 2 has made an emergency stop at the station. Then, the transmission control unit 65 removes the bandwidth restriction on data transmission between the second ground station 10 and the onboard station 20 controlled by the equipment control devices 50, excluding the platform monitoring video transmission device 51 among the multiple equipment control devices 50 (step S303). If the ground stations 10 at stations F and H, which are stations that express trains pass through, are not the second ground stations (No. in step S302), the calculation unit 64 determines that train 2 has passed through the stations as scheduled, and the transmission control unit 65 continues the bandwidth restriction (step S304).

[0077] In the communication control method according to Embodiment 1 described above, data transmission using a private line between the ground station 10 at the passing station and the onboard station 20 of the train 2 is bandwidth-limited. Therefore, according to the communication control method according to Embodiment 1, the consumption of private line resources due to data transmission using a private line between the ground station 10 at the passing station and the onboard station 20 of the train 2 can be reduced, and congestion in inter-station communication using the private line constructed at station 1 can be suppressed.

[0078] Furthermore, in the communication control method according to Embodiment 1, passing stations are determined based on the type of train 2 determined based on the data transmission history and the information of stations to be passed, which indicates the stations to be passed for each type of train 2, and the data transmission between the ground station 10 of the passing station and the onboard station 20 of train 2 is bandwidth-limited. Therefore, according to the communication control method according to Embodiment 1, passing stations can be determined and bandwidth-limited without connecting to existing systems that can acquire information on passing stations in real time, such as operation management systems that monitor and centrally control the operation status of trains. Moreover, since the ground communication control device 60 is not connected to existing systems, it can perform bandwidth-limited data transmission between the ground station 10 of the passing station and the onboard station 20 of train 2 without being affected by modifications to existing systems.

[0079] Furthermore, in the communication control method according to Embodiment 1, data transmission from the judgment device control unit, which requires data transmission when the train is stopped, is not selectively restricted. Instead, the bandwidth restriction that was applied to the device control units 50 excluding the judgment device control unit is released based on the status of data transmission by the judgment device control unit. Therefore, according to the communication control method according to Embodiment 1, even when the train 2 makes an emergency stop, it becomes possible for multiple device control units 50, including the judgment device control unit, to transmit data using a private line.

[0080] <Effects of Embodiment 1> The operation and effects of the communication control system 100, the ground communication control device 60 (communication control device), the communication control program, and the communication control method according to Embodiment 1 of this disclosure will be described.

[0081] The communication control system 100 according to Embodiment 1 of the present disclosure comprises: a ground station 10 installed at each of several stations 1, each of which establishes a private network area 4; an onboard station 20 installed on a train 2, which transmits data to the ground station 10 using a private network; and a ground communication control device 60 that determines which stations the train 2 passes through and limits the bandwidth of data transmission between the ground station 10 of the passing stations and the onboard station 20.

[0082] The ground communication control device 60 according to Embodiment 1 of the present disclosure comprises a calculation unit 64 that determines which stations the train 2 will pass through among a plurality of stations 1, a ground station 10 of a plurality of ground stations 10, each installed at a plurality of stations 1, which each establishes a private network area 4 at a plurality of stations 1, determined by the calculation unit 64 to be a passing station, and an onboard station 20 that performs data transmission using a private network between the onboard station 20, which is installed on the train 2 and is a ground station 10 of the plurality of ground stations 10 that establishes a private network area 4 where the train 2 is located, and a transmission control unit 65 that limits the bandwidth of data transmission between the onboard station 20 and the first ground station 10, which is a ground station of the plurality of ground stations 10 that establishes a private network area 4 where the train 2 is located.

[0083] The communication control program according to Embodiment 1 of this disclosure provides a computer with a calculation function for determining which stations the train 2 will pass through among a plurality of stations 1, and a transmission control function for limiting the bandwidth of data transmission between the ground station 10 of the passing station determined by the calculation function, which is one of a plurality of ground stations 10 each installed at the plurality of stations 1 and each of the plurality of stations 1 is established at the plurality of stations 1, and the onboard station 20 which performs data transmission using a private line between the first ground station 10, which is one of the plurality of ground stations 10 and is established at the station where the train 2 is located, and the first ground station 10 which is one of the plurality of ground stations 10 and is established at the station where the train 2 is located.

[0084] The communication control method according to Embodiment 1 of the present disclosure includes a calculation step of determining which stations a train will pass through from among a plurality of stations 1, and a transmission control step of limiting the bandwidth of data transmission between a ground station 10 of a plurality of ground stations 10, each installed at a plurality of stations 1, which each establishes a private network area 4 at a plurality of stations 1, determined by the calculation step, and a first ground station 10, which is installed on the train 2 and is one of the plurality of ground stations 10 that establishes a private network area 4 where the train 2 is located, and an onboard station 20 that performs data transmission using a private network.

[0085] According to the communication control system 100, ground communication control device 60, communication control program, and communication control method of Embodiment 1 of this disclosure, it is possible to suppress inter-station communication using private lines constructed at stations through which train 2 passes. Therefore, it is possible to reduce the consumption of private line resources by inter-station communication using private lines between stations and passing trains, and to suppress congestion in inter-station communication using private lines constructed at stations.

[0086] Furthermore, the communication control system 100 according to Embodiment 1 of the present disclosure includes a ground communication control device 60 comprising: a calculation unit 64 that determines the type of train 2 and determines passing stations based on passing station information indicating the stations to be passed for each type of train 2; and a transmission control unit 65 that limits the bandwidth of data transmission between the ground station 10 and the onboard station 20 of the passing stations determined by the calculation unit 64. According to the communication control system 100 and the ground communication control device 60 described above, it is possible to determine passing stations and limit bandwidth without connecting to existing systems that can acquire real-time information on passing stations, such as operation management systems that monitor and centrally control the operation status of trains. Furthermore, since the ground communication control device 60 does not connect to existing systems, it is possible to limit the bandwidth of data transmission between the ground station 10 at a passing station and the onboard station 20 of the train 2 without being affected by modifications to existing systems.

[0087] Furthermore, the communication control system 100 according to Embodiment 1 of this disclosure further comprises a plurality of ground devices 30, each installed at a plurality of stations 1 and each connected to a plurality of ground stations 10 in a communicable manner; an onboard device 40, installed on a train 2 and connected to an onboard station 20 in a communicable manner; and a plurality of device control devices 50 that control data transmission from one of the ground devices 30 and the onboard device 40 to the other via the ground stations 10 and the onboard station 20. The ground stations 10 include a first ground station 10 which is a ground station 10 that constructs a private network area 4 in which the train 2 is located. The ground communication control device 60 further comprises a data transmission unit 61 which acquires history information showing the history of data transmission of the onboard station 20 between the plurality of first ground stations 10 and the onboard station 20, and a data identification unit 62 which acquires history identification information that identifies the history information of the onboard station 20 acquired by the data transmission unit 61 for each first ground station 10 and each device control device 50. The calculation unit 64 determines the type of train 2 based on the history identification information and the information of stations to be passed. The transmission control unit 65 limits the bandwidth of data transmission between the ground station 10 and the onboard station 20 of the passing station, which are controlled by the equipment control devices 50 of the multiple equipment control devices 50, excluding the equipment control device for determination. According to the communication control system 100 described above, by not selectively restricting data transmission from the judgment equipment control device that requires data transmission when the train is stopped, data transmission controlled by the judgment equipment control device can be performed even in the case of an unexpected emergency stop of train 2.

[0088] The calculation unit 64 described above determines the second ground station 10, which is the ground station 10 of the passing station where the data transmission controlled by the determination equipment control device took place. The transmission control unit 65 described above removes the bandwidth restriction on data transmission between the second ground station 10 and the onboard station 20 controlled by the equipment control devices 50, excluding the determination equipment control device among the multiple equipment control devices 50. According to the communication control system 100, which includes the calculation unit 64 and transmission control unit 65 described above, even when train 2 makes an unscheduled emergency stop, it becomes possible to transmit data using a private line by multiple device control devices 50, including a determination device control device.

[0089] Although the present disclosure has been described above based on Embodiment 1, the present disclosure is not limited to Embodiment 1. Furthermore, modifying or omitting Embodiment 1 as appropriate is also within the scope of the technical idea of ​​the present disclosure.

[0090] The various aspects of this disclosure are summarized below as an appendix.

[0091] (Note 1) Multiple ground stations are installed at multiple stations, and each of the said multiple stations establishes its own network area, An onboard station installed on the train, which transmits data to each of the aforementioned multiple ground stations using the aforementioned private lines, A communication control device that determines the stations the train passes through and limits the bandwidth of the data transmission between the ground station at the passing station and the onboard station among the plurality of ground stations, A communication control system equipped with the following features. (Note 2) The communication control device is A calculation unit that determines the type of train and determines the passing stations based on passing station information indicating the passing stations for each type of train, A transmission control unit that performs bandwidth limiting for the data transmission between the ground station of the passing station and the onboard station determined by the calculation unit, A communication control system as described in Appendix 1, comprising: (Note 3) Multiple ground devices installed at each of the aforementioned multiple stations and each connected to the aforementioned multiple ground stations in a manner that enables communication, Onboard equipment installed on the aforementioned train and connected to the aforementioned onboard station in a manner that enables communication with it, The system further includes at least one equipment control device that controls one of the ground equipment and the on-board equipment to transmit the data via the ground station and the on-board station to the other. The communication control system described in Appendix 2. (Note 4) The aforementioned ground station includes a first ground station which is a ground station that constructs the private network area in which the train is located, The communication control device is A data transmission unit that acquires history information indicating the history of data transmission of the on-board station between a plurality of the first ground stations, A data identification unit acquires history identification information that identifies the history information of the on-board station acquired by the data transmission unit for each of the first ground stations and each of the equipment control devices, Furthermore, The calculation unit determines the type of train based on the history identification information and the information of stations the train is scheduled to pass through. The communication control system described in Appendix 3. (Note 5) The calculation unit further determines the direction of travel of the train based on station location information indicating the positional relationship of the plurality of stations and the history identification information, and determines the type of train based on the direction of travel of the train, the history identification information and the information of stations to be passed. The communication control system described in Appendix 4. (Note 6) The device comprises multiple such control devices, The plurality of equipment control devices include a determination equipment control device which is an equipment control device that controls the transmission of data only when the train is stopped, The calculation unit determines the passing station based on the history identification information of the determination device control device. The communication control system described in Appendix 4 or Appendix 5. (Note 7) The transmission control unit limits the bandwidth of the data transmission between the ground station of the passing station and the onboard station, which are controlled by the equipment control devices among the plurality of equipment control devices, excluding the determination equipment control device. The communication control system described in Appendix 6. (Note 8) The calculation unit determines the second ground station, which is the ground station of the passing station where the data transmission controlled by the determination device control device was performed, The transmission control unit removes the bandwidth restriction on the data transmission between the second ground station and the on-board station controlled by the equipment control devices, except for the determination equipment control device among the plurality of equipment control devices. The communication control system described in Appendix 7. (Note 9) The aforementioned ground equipment is a surveillance camera installed on the platform of the station to capture platform surveillance footage. The aforementioned onboard equipment is an onboard monitor installed on the train, The aforementioned determination equipment control device is a home surveillance video transmission device that controls the transmission of the home surveillance video data from the surveillance camera to the on-board monitor via the first ground station and the on-board station. A communication control system as described in any one of the items from Appendix 6 to Appendix 8. (Note 10) A calculation unit that determines which stations a train will pass through among multiple stations, A transmission control unit that limits the bandwidth of data transmission between a plurality of ground stations, each of which is installed at one of the plurality of stations and which establishes a private network area at each of the plurality of stations, and a ground station at the passing station, and an onboard station installed on the train that transmits data to the ground station using a private network, A communication control device equipped with the following features. (Note 11) On the computer, A calculation function that determines which stations a train will pass through among multiple stations, A transmission control function that limits the bandwidth of data transmission between a plurality of ground stations, each of which is installed at one of the plurality of stations and which establishes a private network area at each of the plurality of stations, and an on-board station installed on the train and which transmits data to the ground station using a private network, A communication control program to achieve this. (Note 12) A calculation step to determine which stations the train will pass through among multiple stations, A transmission control step that limits the bandwidth of data transmission between a ground station at a passing station, which is one of several ground stations each installed at the aforementioned multiple stations and which establish a private network area at each of the aforementioned multiple stations, and an on-board station installed on the train that transmits data to the ground station using a private network, A communication control method including [Explanation of Symbols]

[0092] 1 station 2 trains 3 routes 4. Private network area 10 Ground stations 11 Antennas 20 Onboard station 21 Antennas 30 Ground equipment 31 surveillance cameras 40 Onboard equipment 41. In-car monitor 50 Equipment control devices 51 Home Surveillance Video Transmission Device 60. Terrestrial communication control device 61 Data Transmission Section 62 Data Identification Unit 63 Memory section 64 Arithmetic section 65 Transmission Control Unit 70. On-board communication control device 100 Communication control system

Claims

1. Multiple ground stations are installed at multiple stations, and each of the said multiple stations establishes its own network area, An onboard station installed on the train, which transmits data to each of the aforementioned multiple ground stations using the aforementioned private lines, A communication control device that determines the stations the train passes through and limits the bandwidth of the data transmission between the ground station at the passing station and the onboard station among the plurality of ground stations, A communication control system equipped with the following features.

2. The communication control device is A calculation unit that determines the type of train and determines the passing stations based on passing station information indicating the passing stations for each type of train, A transmission control unit that performs bandwidth limiting for the data transmission between the ground station of the passing station and the onboard station determined by the calculation unit, A communication control system according to claim 1, comprising:

3. Multiple ground devices installed at each of the aforementioned multiple stations and each connected to the aforementioned multiple ground stations in a manner that enables communication, Onboard equipment installed on the aforementioned train and connected to the aforementioned onboard station in a manner that enables communication with it, The system further includes at least one equipment control device that controls the transmission of data from one of the ground equipment and the on-board equipment to the other via the ground station and the on-board station. The communication control system according to claim 2.

4. The plurality of ground stations include a first ground station which is a ground station that constructs the private network area in which the train is located, The communication control device is A data transmission unit that acquires history information indicating the history of data transmission of the on-board station between a plurality of the first ground stations, A data identification unit acquires history identification information for each of the first ground stations and each of the equipment control devices, based on the history information of the on-board station acquired by the data transmission unit. Furthermore, The calculation unit determines the type of train based on the history identification information and the information of stations the train is scheduled to pass through. The communication control system according to claim 3.

5. The calculation unit further determines the direction of travel of the train based on station location information indicating the positional relationship of the plurality of stations and the history identification information, and determines the type of train based on the direction of travel of the train, the history identification information and the information of stations to be passed. The communication control system according to claim 4.

6. The device comprises multiple such control devices, The plurality of equipment control devices include a determination equipment control device which is an equipment control device that controls the transmission of data only when the train is stopped, The calculation unit determines the passing station based on the history identification information of the determination device control device. The communication control system according to claim 4.

7. The transmission control unit limits the bandwidth of the data transmission between the ground station of the passing station and the onboard station, which are controlled by the equipment control devices among the plurality of equipment control devices, excluding the determination equipment control device. The communication control system according to claim 6.

8. The calculation unit determines the second ground station, which is the ground station of the passing station where the data transmission controlled by the determination device control device took place. The transmission control unit removes the bandwidth restriction on the data transmission between the second ground station and the on-board station controlled by the equipment control unit, except for the determination equipment control unit among the plurality of equipment control units. The communication control system according to claim 7.

9. The aforementioned ground equipment is a surveillance camera installed on the platform of the station to capture platform surveillance footage. The aforementioned onboard equipment is an onboard monitor installed on the train, The aforementioned determination equipment control device is a home surveillance video transmission device that controls the transmission of the home surveillance video data from the surveillance camera to the on-board monitor via the first ground station and the on-board station. A communication control system according to any one of claims 6 to 8.

10. A calculation unit that determines which stations a train will pass through among multiple stations, A transmission control unit that limits the bandwidth of data transmission between a plurality of ground stations, each of which is installed at one of the plurality of stations and which establishes a private network area at each of the plurality of stations, and a ground station at the passing station, and an onboard station installed on the train that transmits data to the ground station using a private network, A communication control device equipped with the following features.

11. On the computer, A calculation function that determines which stations a train will pass through among multiple stations, A transmission control function that limits the bandwidth of data transmission between a plurality of ground stations, each of which is installed at one of the plurality of stations and which establishes a private network area at each of the plurality of stations, and an on-board station installed on the train and which transmits data to the ground station using a private network, A communication control program to achieve this.

12. A calculation step to determine which stations the train will pass through among multiple stations, A transmission control step that limits the bandwidth of data transmission between a ground station at a passing station, which is one of several ground stations each installed at the aforementioned multiple stations and which establish a private network area at each of the aforementioned multiple stations, and an on-board station installed on the train that transmits data to the ground station using a private network, A communication control method including

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