Earthquake information transmission system, base station radio equipment, mobile station radio equipment, earthquake information transmission method, and program

Abstract

To reduce the time required from the occurrence of an earthquake until trains come to a halt. [Solution] An earthquake information transmission system is provided, comprising: an earthquake information generation device; multiple base station radio devices arranged along a railway track; multiple on-board radio devices mounted on each of multiple railway vehicles running on the railway track; and at least one brake control device mounted on each railway vehicle, wherein the earthquake information generation device transmits the earthquake information to at least one base station radio device selected from the multiple base station radio devices based on the sensing information; the at least one base station radio device transmits the received earthquake information to at least one on-board radio device connected to the base station radio device; and the at least one on-board radio device transmits the received earthquake information to the at least one brake control device corresponding to the on-board radio device.

Description

Technical Field

[0001] The present disclosure relates to a seismic information transmission system, a base station wireless device, an on-vehicle station wireless device, a seismic information transmission method, and a program.

Background Art

[0002] A system for emergency stopping of railway vehicles during disasters such as earthquakes is an important system for ensuring the safety of passengers and reducing damage to railway vehicles. The time required for a railway vehicle to stop from the occurrence of an earthquake is a very important factor in reducing damage to passengers and railway vehicles, and it is required to be as short as possible.

[0003] In many conventional lines, a system is adopted in which an emergency stop signal is issued during an earthquake, and a driver who receives the emergency stop signal stops the vehicle. However, in this method, since the emergency stop is performed via the driver, there is a problem that it takes time for the railway vehicle to stop from the occurrence of an earthquake.

[0004] Therefore, as disclosed in Patent Document 1, in the Shinkansen etc., seismic information observed by a seismometer is transmitted to a substation, power transmission is stopped at the substation, and a vehicle that detects a power outage activates an emergency brake to automatically stop the railway vehicle. A system is adopted.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the system disclosed in Patent Document 1, there is a risk that using regenerative braking when a railway vehicle stops may cause a voltage increase, making it impossible to detect a power outage. Therefore, the frequency of the regenerative power is set slightly lower than the frequency used for operating the railway vehicle, so that the cessation of power transmission can be detected without any problems.

[0007] However, the system disclosed in Patent Document 1 above would shut down the power supplied to the railway vehicle, simultaneously shutting down important onboard systems such as wireless systems, and there is a time lag between detecting the power outage and activating the emergency brakes, so there is room for improvement.

[0008] From this perspective, a method is being considered to directly transmit earthquake information to the brake control devices installed in railway vehicles. This method is expected to shorten the time it takes for railway vehicles to stop after an earthquake occurs.

[0009] Conventional methods for transmitting information to railway vehicles include using the electric current flowing through the track circuit, using transponders installed near the rails, and transmitting information via wireless communication.

[0010] Of these information transmission methods, those using track circuits or transponders require the installation of numerous devices at short intervals near the rails, resulting in high costs. In this respect, wireless communication offers a cost advantage.

[0011] Since a single ground radio device cannot cover the entire railway line, it is conceivable that multiple ground radio devices would be installed along the railway line. In this case, as the railway vehicle moves, the onboard radio device would sequentially switch to the ground radio device it is connecting to.

[0012] Typically, an IP network is used for wireless communication between on-board radio equipment and ground radio equipment. In this case, a different IP address is assigned to each railway vehicle, and in order to transmit an IP packet from the ground radio equipment to the on-board radio equipment, it would be necessary to generate an IP packet with the IP address assigned to the destination railway vehicle in the header, and then forward that IP packet to the ground radio equipment to which that railway vehicle is connected.

[0013] In this case, it would be necessary to recognize the presence status of all railway vehicles, generate IP packets with the IP address for each railway vehicle in the header, identify the ground radio equipment to which each railway vehicle's onboard radio equipment is connected, and transmit the IP packets to that ground radio equipment. For these reasons, there is still room for improvement in reducing the time required from the occurrence of an earthquake until railway vehicles come to a stop.

[0014] The purpose of this disclosure is to reduce the time required from the occurrence of an earthquake until railway vehicles come to a halt. [Means for solving the problem]

[0015] An earthquake information generation device that generates earthquake information based on sensing information from multiple earthquake sensors, Multiple base station radio equipment units are positioned along the railway tracks, Multiple onboard radio equipment is installed on each of the multiple railway vehicles that run on the aforementioned railway track, Each railway vehicle is equipped with at least one brake control device, Includes, The earthquake information generating device transmits the earthquake information to at least one base station radio device selected from the plurality of base station radio devices based on the sensing information. The at least one base station radio device transmits the received earthquake information to at least one vehicle-mounted radio device connected to the base station radio device. The at least one on-vehicle radio device transmits the received earthquake information to the at least one brake control device corresponding to the on-vehicle radio device. An earthquake information transmission system is provided.

[0016] A base station radio device arranged along a railway track, a receiving unit that receives the earthquake information from an earthquake information generating device that generates earthquake information based on sensing information of a plurality of earthquake sensors, a transmitting unit that transmits the received earthquake information to at least one on-vehicle radio device connected to the base station radio device, and when transmitting the received earthquake information to at least one on-vehicle radio device connected to the base station radio device, the transmitting unit repeats the transmission of the earthquake information without waiting for an assumed maximum response delay time. A base station radio device is provided.

[0017] An on-vehicle radio device mounted on a railway vehicle running on a railway track, a receiving unit that receives earthquake information from a base station radio device arranged along the railway track, a transmitting unit that transmits the received earthquake information to at least one brake control device corresponding to the on-vehicle radio device, and when transmitting the received earthquake information to at least one brake control device corresponding to the on-vehicle radio device, the transmitting unit repeats the transmission of the earthquake information without waiting for an assumed maximum response delay time. An on-vehicle radio device is provided.

[0018] An earthquake information generating device that generates earthquake information based on sensing information of a plurality of earthquake sensors, a plurality of base station radio devices arranged along the railway track, a plurality of on-vehicle radio devices mounted on each of the plurality of railway vehicles running on the railway track, and at least one brake control device mounted on each railway vehicle including A method for transmitting earthquake information in an earthquake information transmission system, The earthquake information generation device transmits the earthquake information to at least one base station wireless device selected based on the sensing information among the plurality of base station wireless devices, The at least one base station wireless device transmits the received earthquake information to at least one on-vehicle station wireless device connected to the base station wireless device, The at least one on-vehicle station wireless device transmits the received earthquake information to the at least one brake control device corresponding to the on-vehicle station wireless device. An earthquake information transmission method is provided.

Advantages of the Invention

[0019] According to the present disclosure, the time required from the occurrence of an earthquake until a railway vehicle stops can be shortened.

Brief Description of the Drawings

[0020] [Figure 1] It is a block diagram of an earthquake information transmission system. [Figure 2] It is a control flow of an earthquake information transmission system. [Figure 3] It is a block diagram of an earthquake information transmission system. [Figure 4] It is a sequence diagram of an earthquake information transmission system. [Figure 5] It is a sequence diagram of a comparative example. [Figure 6] It is a diagram showing the flow of IP packet transfer in an earthquake information transmission system. [Figure 7] It is a diagram showing the flow of IP packet transfer in a comparative example. [Figure 8] It is a block diagram of an earthquake information central device. [Figure 9] It is a control flow of an earthquake information central device. [Figure 10] It is a control flow during equipment inspection of an earthquake information central device. [Figure 11] This is a block diagram of the base station radio equipment. [Figure 12] This is the control flow for base station wireless equipment. [Figure 13] This is a block diagram of the on-board radio equipment. [Figure 14] This is the control flow for a vehicle-mounted radio system. [Figure 15] This is a block diagram of the brake control device. [Figure 16] This is the control flow for the brake control device. [Figure 17] This diagram shows the flow of IP packet forwarding. [Figure 18] This is a block diagram showing the processing circuit of the earthquake information central device, which is composed of a processor and memory. [Figure 19] This is a block diagram of the processing circuit of the earthquake information central device when it is implemented in hardware. [Modes for carrying out the invention]

[0021] (Summary of this disclosure) First, an overview of this disclosure will be provided. Figure 1 is a block diagram of the earthquake information transmission system 10000. The earthquake information transmission system 10000 includes an earthquake information generating device 10001, a plurality of base station radio devices 10002, a plurality of vehicle-mounted station radio devices 10003, and at least one brake control device 10004.

[0022] The earthquake information generation device 10001 generates earthquake information based on sensing information from multiple earthquake sensors.

[0023] Multiple base station radio devices 10002 are arranged along the railway track.

[0024] Multiple on-board radio units 10003 are installed on each of the multiple railway vehicles that run on the railway tracks.

[0025] At least one brake control device 10004 is installed in each railway vehicle.

[0026] The earthquake information generating device 10001 transmits earthquake information to at least one base station radio device 10002 selected from among multiple base station radio devices 10002 based on sensing information.

[0027] At least one base station radio device 10002 transmits the received earthquake information to at least one vehicle-mounted radio device 10003 connected to the base station radio device 10002.

[0028] At least one on-board radio device 10003 transmits the received earthquake information to at least one brake control device 10004 corresponding to the said on-board radio device 10003.

[0029] Next, we will explain the operation of the earthquake information transmission system 10000. Figure 2 shows the control flow of the earthquake information transmission system 10000.

[0030] First, the earthquake information generating device 10001 transmits earthquake information to at least one base station radio device 10002 selected from among a plurality of base station radio devices 10002 based on sensing information (S10001). Next, at least one base station radio device 10002 transmits the received earthquake information to at least one vehicle-mounted radio device 10003 connected to that base station radio device 10002 (S10002). Then, at least one vehicle-mounted radio device 10003 transmits the received earthquake information to at least one brake control device 10004 corresponding to that vehicle-mounted radio device 10003 (S10003).

[0031] With the above configuration, the time required from the occurrence of an earthquake until the railway vehicles come to a halt can be shortened.

[0032] (First Embodiment) Next, the earthquake information transmission system in the first embodiment of this disclosure will be described. Hereinafter, an overview of the earthquake information transmission system will be described with reference to Figures 3 to 7, and then the details of the earthquake information transmission system will be described with reference to Figures 8 to 16.

[0033] Figure 3 is a block diagram of the earthquake information transmission system 100. Figure 4 is a sequence diagram of the earthquake information transmission system 100.

[0034] As shown in Figures 3 and 4, the earthquake information transmission system 100 includes a plurality of earthquake information central devices 101, 102, a plurality of base station radio devices 111, 112, a plurality of on-board radio devices 121, 122...125, and a plurality of brake control devices 131, 132...135.

[0035] The earthquake information central device 101 is a specific example of an earthquake information generation device. The earthquake information central device 101 generates earthquake information based on sensing information received from multiple earthquake sensors (not shown). The earthquake information central device 101 stores the generated earthquake information in earthquake information packets, which are IP packets. The earthquake information includes information about an actual earthquake, or information used to inspect the earthquake information transmission system. Information about an actual earthquake may include the magnitude of the earthquake, the seismic intensity of the earthquake, the latitude and longitude of the earthquake, and other information.

[0036] The earthquake information central device 101 transmits earthquake information packets to base station radio devices 111 and 112 selected by the earthquake information central device 101 as appropriate destinations from among multiple base station radio devices 111 and 112. In other words, the destination IP address of the earthquake information packet is set to the IP address of the selected base station radio device 111 or 112.

[0037] Here, the central earthquake information unit 101 determines the selection of base station radio devices 111 and 112 for transmitting earthquake information packets by taking into consideration the sensing information from the earthquake sensors and the locations where the base station radio devices 111 and 112 are installed. The sensing information typically includes the magnitude of the detected earthquake, the seismic intensity of the detected earthquake, the latitude and longitude information of the earthquake sensor itself, and other information related to the detected earthquake.

[0038] The earthquake information central unit 101 repeatedly transmits earthquake information packets destined for base station radio devices 111 to 112. Specifically, the earthquake information central unit 101 repeatedly transmits earthquake information packets destined for base station radio devices 111 to 112 without waiting for the maximum possible response delay time.

[0039] Upon receiving an earthquake information packet, base station radio devices 111-112 repeatedly forward the earthquake information signal contained in the packet to the on-board radio devices 121-125 of the railway vehicles currently connected to them. Base station radio devices 111-112 repeatedly transmit the earthquake information signal destined for on-board radio devices 121-125 without waiting for the maximum possible response delay time. At this time, base station radio devices 111-112 transmit to the earthquake information central device 101 a response packet indicating that they have received the earthquake information packet, or a forwarding destination on-board station information packet containing information indicating the railway vehicle connected to the base station radio device that forwarded the earthquake information signal. The forwarding destination on-board station information stored in the forwarding destination on-board station information packet includes information identifying the on-board radio devices 121-125, which are the forwarding destinations to which base station radio devices 111-112 forwarded the earthquake information signal. The information that identifies the on-board radio devices 121-125 is typically the IP address of the on-board radio devices 121-125.

[0040] Here, when base station radio equipment 111-112 repeatedly transmits earthquake information signals to onboard radio equipment 121-125 of railway vehicles currently connected to base station radio equipment 111-112, transmitting the earthquake information signals using a radio method with a particularly low error rate compared to normal radio signals is effective in reducing the average transmission delay. Here, a radio method with a low error rate refers to one that employs a low modulation scheme such as BPSK (Binary Phase-Shift Keying), or an error correction scheme with a low coding rate, or a second-order modulation scheme such as spread spectrum with a high spreading rate. Normally, transmitting signals using a radio method with a low error rate has the disadvantage of reducing transmission efficiency and the amount of data that can be transmitted, but since the amount of information in earthquake information signals is low, it does not have a significant impact on the overall transmission efficiency, which is particularly low in error rate for transmitting earthquake information signals.

[0041] When the earthquake information central unit 101 receives a response packet or a forwarding destination on-board station information packet from base station radio devices 111-112, it stops repeatedly forwarding earthquake information packets to the base station radio devices 111-112 that sent the forwarding destination on-board station information packet. Furthermore, when it receives a forwarding destination on-board station information packet, it stores the forwarding destination on-board station information.

[0042] Upon receiving an earthquake information signal, the on-board radio units 121-125 generate an earthquake information packet containing the earthquake information, repeatedly forward the generated earthquake information packet to the brake control devices 131-135 on the same railway vehicle, and return a response signal to the base station radio units 111-112, which are the source of the earthquake information signal. The on-board radio units 121-125 repeatedly transmit earthquake information packets destined for the brake control devices 131-135 without waiting for the maximum possible response delay time. Upon receiving a response signal from the on-board radio units 121-125, the base station radio units 111-112 stop repeatedly forwarding the earthquake information signal to the on-board radio units 121-125 that sent the response signal.

[0043] Upon receiving an earthquake information packet, brake control devices 131-135 determine whether or not it is necessary to stop the railway vehicle based on the earthquake information stored in the packet. If brake control devices 131-135 determine that it is necessary to stop the railway vehicle, they generate an emergency stop signal to stop the railway vehicle and output the emergency stop signal to the brake device.

[0044] Upon receiving an earthquake information packet, brake control devices 131-135 send a response packet back to the on-board radio equipment 121-125, which was the source of the earthquake information packet. Upon receiving the response packet from brake control devices 131-135, the on-board radio equipment 121-125 stops repeatedly forwarding the earthquake information packet to the brake control devices 131-135 that sent the response packet.

[0045] Furthermore, if the brake control devices 131-135 receive an earthquake information packet and the earthquake information central device 101 performs equipment inspection processing, they generate a reception confirmation information packet addressed to the earthquake information central device 101 indicating that the earthquake information packet has been received, and transmit it to the on-board radio devices 121-125. The reception confirmation information includes information that identifies the brake control devices 131-135. Typically, the information that identifies the brake control devices 131-135 is the IP address of the brake control devices 131-135.

[0046] Upon receiving a reception confirmation packet, the on-board radio equipment 121-125 forwards the reception confirmation packet to the base station radio equipment 111-112. Upon receiving the reception confirmation packet, the base station radio equipment 111-112 forwards the reception confirmation packet to the earthquake information central equipment 101-102.

[0047] Upon receiving the confirmation packet, the earthquake information central device 101 sends a response packet addressed to the brake control devices 131-135 to the base station radio devices 111-112, to which the on-board radio devices 121-125 of the same railway vehicle that generated the confirmation packet. Upon receiving the response packet for the confirmation packet, the base station radio devices 111-112 forward the response packet to the on-board radio devices 121-125 of the same railway vehicle that generated the confirmation packet. Upon receiving the response packet for the confirmation packet, the on-board radio devices 121-125 forward the response packet to the brake control device that generated the confirmation packet. The brake control devices 131-135 that transmitted the confirmation packet wait for a certain period of time for a response packet to be returned, and if no response packet is returned for the confirmation packet, they retransmit the confirmation packet.

[0048] After transmitting an earthquake information packet, the earthquake information central device 101 waits for a certain period of time and then, as part of its equipment inspection process, compares the brake control device inferred from the received destination on-board station information with the brake control device of the source of the received reception confirmation information packet. If the brake control device inferred from the destination on-board station information does not match the brake control device of the source of the reception confirmation information, the earthquake information central device 101 issues an alarm to indicate this. By referring to this alarm information, the operator of the earthquake information transmission system 100 can confirm whether the earthquake information transmission system 100 is functioning correctly. Note that the equipment inspection process does not affect the operation of the earthquake information transmission system 100 itself even if it is not performed, but if the equipment inspection process is not performed, measures such as checking the log information of each device will be necessary to confirm the normality of the earthquake information transmission system 100.

[0049] In Figure 4, for illustrative purposes, it is assumed that the earthquake information initially transmitted by base station radio devices 111-112 to vehicle-mounted radio devices 121-125 did not reach the vehicle-mounted radio devices 121-125. The time from when the earthquake information central device 101 first transmitted the earthquake information packet to base station radio device 111 to when the brake control device 131 first received the earthquake information packet is shown as the "earthquake information transmission delay time during packet loss".

[0050] Next, in order to deepen our understanding of the operation of the earthquake information transmission system 100 in this embodiment, we will compare the operation of the earthquake information transmission system 100 in this embodiment with the operation of the earthquake information transmission system 100 in the comparative example. Figure 5 shows a sequence diagram of the earthquake information transmission system 100 in the comparative example. It should be noted that this comparative example was devised by the inventor of the present application and is recognized as neither publicly known nor widely known.

[0051] In the comparative example shown in Figure 5, the earthquake information central device 101 generates earthquake information for each brake control device 131 to 135 that it determines needs to transmit earthquake information. The earthquake information central device 101 stores the generated earthquake information in an earthquake information packet, which is an IP packet. The earthquake information is either information about an actual earthquake that occurred, or information used to inspect the earthquake information transmission system, and this earthquake information is included in the earthquake information packet.

[0052] The earthquake information central device 101 forwards the earthquake information packet to the base station radio devices 111-112 to which the railway vehicle on which the brake control device is installed is connected. The base station radio devices 111-112, upon receiving the earthquake information packet, forward it to the on-board radio devices 121-125 of the railway vehicle on which the brake control device 131-135, the destination of the earthquake information packet, is installed. The on-board radio devices 121-125, upon receiving the earthquake information packet, forward it to the brake control device 131-135.

[0053] Upon receiving an earthquake information packet, brake control devices 131-135 determine whether or not it is necessary to stop the railway vehicle based on the earthquake information stored in the packet. If brake control devices 131-135 determine that it is necessary to stop the railway vehicle, they generate an emergency stop signal to stop the railway vehicle and output the emergency stop signal to the brake device.

[0054] Furthermore, brake control devices 131-135, upon receiving the earthquake information packet, generate a response packet destined for the earthquake information central device 101 and transmit the response packet to the on-board radio equipment 121-125 of the railway vehicle. The on-board radio equipment 121-125, having received the response packet from the brake control devices 131-135, forward the response packet to the connected base station radio equipment 111-112. The base station radio equipment 111-112, having received the response packet, forward the response packet to the earthquake information central device 101.

[0055] After transmitting earthquake information packets to base station radio devices 111-112, the earthquake information central device 101 waits for a certain period of time and then, as part of its equipment inspection process, compares the destination brake control device of the transmitted earthquake information packet with the source brake control device of the response packet. If the destination brake control device of the transmitted earthquake information packet and the source brake control device of the response packet do not match, the earthquake information central device 101 issues an alarm to indicate this. By referring to this alarm information, the operator of the earthquake information transmission system 100 can confirm whether the earthquake information transmission system 100 is functioning correctly.

[0056] In Figure 5, for illustrative purposes, it is assumed that the earthquake information initially transmitted by base station radio devices 111-112 to vehicle-mounted radio devices 121-125 did not reach the vehicle-mounted radio devices 121-125. The time from when the earthquake information central device 101 first transmits an earthquake information packet to base station radio device 111 to when the brake control device 131 first receives the earthquake information packet is shown as the "earthquake information transmission delay time during packet loss". The earthquake information central device 101 repeatedly transmits earthquake information packets to base station radio devices 111-112. At this time, the time interval between repeated transmissions is set to be equal to or greater than the assumed maximum response delay time.

[0057] Next, we will explain the difference between the transmission of earthquake information in this embodiment and the transmission of earthquake information in the comparative example. Figure 6 shows the flow of IP packet forwarding in the earthquake information transmission system. Figure 7 shows the flow of IP packet forwarding in the comparative example. In Figures 6 and 7, the destination IP address written in the packet header of the earthquake information packet is represented by adding a symbol (such as X or A) to the left of the frame showing the earthquake information packet in the figure.

[0058] First, as shown in Figure 6, in this embodiment, the destination IP address of the earthquake information packet generated by the earthquake information central device 101 (indicated in Figure 6 as being forwarded to X and Y as the packet destination) is the IP address of the base station wireless devices 111 to 112. In contrast, as shown in Figure 7, in the comparative example, the destination IP address of the earthquake information packet generated by the earthquake information central device 101 (indicated in Figure 7 as being forwarded to A to E as the packet destination) is the brake control devices 131 to 135.

[0059] Typically, multiple vehicle-mounted radio units 121-125 are connected to a single base station radio unit 111-112. Therefore, compared to this embodiment, the comparative example requires the generation of a large number of earthquake information packets by the earthquake information central unit 101.

[0060] Furthermore, since railway vehicles are in motion, in the comparative example, the earthquake information central device 101 needs to constantly know which base station wireless devices 111-112 the railway vehicle is connected to, determine which brake control devices 131-135 to transmit the earthquake information packet to, and generate the earthquake information packet.

[0061] In contrast, in this embodiment, since the base station wireless devices 111 to 112 do not move, the earthquake information central device 101 does not need to know which base station wireless device 111 to 112 the railway vehicle is connected to when generating earthquake information packets.

[0062] Furthermore, when transmitting earthquake information packets from the earthquake information central device 101 to the base station wireless devices 111-112, in the comparative example, the earthquake information packets need to be forwarded to the base station wireless devices 111-112 to which the destination of the earthquake information packets is connected, thus requiring the handover device 141 shown in Figure 7. In contrast, in this embodiment, the handover device 141 is unnecessary.

[0063] Furthermore, in order to improve the reliability of earthquake information packet transmission, it is necessary to retransmit earthquake information packets when transmission is interrupted due to packet loss or other reasons. In the comparative example, earthquake information packets are forwarded from the earthquake information central device 101 to the brake control devices 131-135, and the earthquake information central device 101 retransmits the earthquake information packets, taking into account the maximum possible response delay time until a response packet is returned from the brake control devices 131-135 to the earthquake information central device 101. If the earthquake information packets do not reach the brake control devices 131-135 due to packet loss or other reasons, retransmission will cause a brake control delay of approximately the above-mentioned maximum response delay time.

[0064] In contrast, in this embodiment, retransmission is performed independently between each device in three stages: from the earthquake information central device 101-102 to the base station radio devices 111-112, from the base station radio devices 111-112 to the vehicle-mounted radio devices 121-125, and from the vehicle-mounted radio devices 121-125 to the brake control devices 131-135. This allows for a shorter transmission delay time during packet loss compared to the comparative example. Furthermore, since the earthquake information central device 101-102, base station radio devices 111-112, and vehicle-mounted radio devices 121-125 retransmit without waiting for the maximum possible response delay time, delays in brake control due to packet loss and other factors can be further reduced.

[0065] For example, in Figure 4, the time interval at which the earthquake information central device 101, base station radio equipment 111, and vehicle-mounted radio equipment 121 transmit earthquake information packets is several milliseconds, while in Figure 5, the time interval at which the earthquake information central device 101, base station radio equipment 111, and vehicle-mounted radio equipment 121 transmit earthquake information packets is approximately several tens of milliseconds to several seconds.

[0066] Furthermore, simply retransmitting in three stages as described above does not allow the earthquake information central devices 101-102 to determine whether the earthquake information packets have reached the brake control devices 131-135. This presents a problem in that the equipment inspection process for the earthquake information transmission system 100 cannot be performed. To address this, in this embodiment, the base station radio devices 111-112 transmit the destination on-board station information packets, and the brake control devices 131-135 transmit the reception confirmation information packets to the earthquake information central devices 101-102. This allows the earthquake information central devices 101-102 to verify that the earthquake information packets have been transmitted to the brake control devices 131-135 without any problems by comparing the IP addresses of the on-board station radio devices 121-125 indicated by the destination on-board station information packets with the IP addresses of the brake control devices 131-135 indicated by the reception confirmation information packets.

[0067] Next, the configuration and operation of the earthquake information transmission system 100 will be described in detail with reference to Figures 8 to 16.

[0068] (Earthquake information central equipment 101~102) Figure 8 shows a block diagram of the earthquake information central device. Since the earthquake information central device 101 and the earthquake information central device 102 have the same configuration, the earthquake information central device 101 will be described as a representative example. As shown in Figure 8, the earthquake information central device 101 includes an earthquake sensor information collection unit 601 that collects earthquake sensor information, an earthquake information determination unit 602 that processes the collected earthquake sensor information, decides on the emergency stop of railway vehicles, and generates earthquake information packets, an equipment inspection processing unit 603 that performs equipment inspections in the earthquake information transmission system 100, and an IP network processing unit 604 that performs IP packet communication processing such as transmitting earthquake information packets, receiving destination base station information packets, and receiving reception confirmation information packets. Earthquake sensor information is one specific example of sensing information.

[0069] Figure 9 shows the control flow of the earthquake information central unit. First, the earthquake sensor information collection unit 601 collects earthquake sensor information from earthquake sensors and inputs it to the earthquake information determination unit 602.

[0070] The earthquake information determination unit 602 determines whether or not earthquake sensor information is available (S100). If earthquake sensor information is available, the earthquake information determination unit 602 determines whether or not to stop the railway vehicle based on that earthquake sensor information (S110). If it determines that to stop the vehicle, the earthquake information determination unit 602 generates an earthquake information packet (S120). Here, the earthquake information determination unit 602 generates a packet for each of the base station radio devices 111 to 112 selected as the transfer destination based on the earthquake sensor information.

[0071] One example of a method for selecting base station radio devices 111-112 to forward earthquake information packets is to determine the epicenter location and earthquake intensity from earthquake sensor information, set a certain distance for each earthquake intensity, and select a base station radio device 111-112 when the distance between the epicenter location and the base station radio devices 111-112 is within that distance.

[0072] Furthermore, if there is no earthquake sensor information in step S100, the earthquake information determination unit 602 determines whether the inspection start condition is met (S130). If the inspection start condition is met, the earthquake information determination unit 602 generates an earthquake information packet for inspection (S140).

[0073] One example of when the above inspection start conditions are met is to set a specific inspection timing and consider the inspection start conditions met when that timing is reached. When the inspection start conditions are met, the above inspection can be performed on all base station radio equipment 111-112.

[0074] The IP network processing unit 604 transmits the earthquake information packet generated by the earthquake information determination unit 602 to the destination IP address of the earthquake information packet, that is, to each base station radio device 111 to 112 to which the destination IP address is assigned (S150). The IP network processing unit 604 then performs retransmission processing of the earthquake information packet until it receives a forwarding destination on-board station information packet (or response packet) from the base station radio devices 111 to 112 (S160).

[0075] When the IP network processing unit 604 receives a destination on-board station information packet (or response packet) or has performed retransmission for a certain period of time, it stops retransmitting the earthquake information packet to the base station radio equipment 111-112, which is the source of the destination on-board station information (S170).

[0076] Once the IP network processing unit 604 has finished transmitting all earthquake information packets, the equipment inspection processing unit 603 performs the process of acquiring reception confirmation information and the equipment inspection process (S180).

[0077] Figure 10 shows the control flow during equipment inspection of the earthquake information central device 101. Specifically, Figure 10 shows the processing flowcharts for acquiring reception confirmation information and the equipment inspection process in the earthquake information central device 101. As shown in Figure 10, the equipment inspection processing unit 603 first receives a reception confirmation information packet (S200) and then sends a response packet (S210). The equipment inspection processing unit 603 then waits for a certain period of time for the reception confirmation information packet to be received (S200). If the timeout occurs, the equipment inspection processing unit 603 performs a matching process (matching process) between the forwarding destination on-board station information and the reception confirmation information as part of the equipment inspection process (S220). If the equipment inspection processing unit 603 fails to match the forwarding destination on-board station information and the reception confirmation information, i.e., the forwarding destination on-board station information and the reception confirmation information do not match, the equipment inspection processing unit 603 issues an alarm (S240) and terminates the process.

[0078] (Base station wireless equipment 111~112) Figure 11 shows a block diagram of the base station radio equipment. Since base station radio equipment 111 and base station radio equipment 112 have the same configuration, base station radio equipment 111 will be described as a representative example. As shown in Figure 11, base station radio equipment 111 includes an IP network processing unit 901 that transmits and receives IP packets such as earthquake information packets, an earthquake information conversion unit 902 that converts earthquake information packets into earthquake information signals, and a wireless communication unit 903 that performs wireless communication with on-board radio equipment 121 to 125.

[0079] Figure 12 shows the control flow of the base station radio equipment. First, when the IP network processing unit 901 receives an earthquake information packet (S300), the earthquake information conversion unit 902 transmits a forwarding destination on-board station information packet (or response packet) containing information (IP addresses) of the on-board station radio equipment 121 to 125 connected to the base station radio equipment 111 to the earthquake information central unit 101 (S310).

[0080] Next, the base station radio device 111 transmits an earthquake information signal containing the earthquake information obtained above to one or more vehicle-mounted radio devices 121-125 connected to the base station radio device 111 (S320). Here, the earthquake information packet is transmitted and received at the network layer of the OSI 7-layer model, while the earthquake information signal is transmitted and received at the data link layer of the OSI 7-layer model. The information contained in the earthquake information packet and the information contained in the earthquake information signal are identical. Since data transmission and reception at the data link layer of the OSI 7-layer model is faster than data transmission and reception at the network layer of the OSI 7-layer model, the base station radio device 111 transmits the earthquake information signal to the vehicle-mounted radio devices 121-125 using the data link layer. The network connecting the base station radio device 111 and the vehicle-mounted radio devices 121-125 is typically realized by wireless communication using radio waves.

[0081] The base station radio device 111 repeatedly retransmits the earthquake information signal until it receives a response signal from the on-board radio devices 121-125 or until it times out (S330) (S340). When the base station radio device 111 receives a response signal from all connected on-board radio devices 121-125 or times out, it returns to receiving earthquake information packets (S300). The base station radio device 111 also wirelessly forwards packets destined for devices on railway vehicles to the on-board radio devices 121-125 on those railway vehicles, and forwards packets received from the on-board radio devices 121-125 to the devices to which those packets are destined.

[0082] (Onboard station radio equipment 121~125) Figure 13 shows a block diagram of the vehicle-mounted radio equipment. Since vehicle-mounted radio equipment 121 and vehicle-mounted radio equipment 122 have the same configuration, we will describe vehicle-mounted radio equipment 121 as a representative example. As shown in Figure 13, vehicle-mounted radio equipment 121 includes a wireless communication unit 1101 that performs wireless communication with the base station radio equipment 111, an earthquake information conversion unit 1102 that converts earthquake information signals into earthquake information packets, and an IP network processing unit 1103 that sends and receives IP packets such as earthquake information packets.

[0083] Figure 14 shows the control flow of the on-board radio equipment. First, when the earthquake information conversion unit 1102 receives an earthquake information signal from the base station radio equipment 111 via the radio line (S400), it transmits a response signal to the base station radio equipment 111 (S410). Next, the earthquake information conversion unit 1102 generates an earthquake information packet from the received earthquake information signal and forwards it to the brake control device 131 installed on the same railway vehicle (S420). The earthquake information conversion unit 1102 repeats retransmitting the earthquake information packet until it receives a response packet from the brake control device 131 or until it times out (S430). When the earthquake information conversion unit 1102 receives a response packet from the brake control device 131 or times out, it returns to receiving the earthquake information signal (S400).

[0084] Furthermore, the on-board radio device 121 wirelessly forwards packets destined for the base station radio device 111 to the base station radio device 111 to which the on-board radio device 121 is connected, and forwards packets received from the base station radio device 111 to the equipment on the railway vehicle that is the destination of the packet.

[0085] (Brake control device 131) Figure 15 shows a block diagram of the brake control device. Since brake control device 131 and brake control device 132 have the same configuration, brake control device 131 will be described as a representative example. As shown in Figure 15, brake control device 131 includes an IP network processing unit 1301 that sends and receives IP packets such as earthquake information packets, and an emergency brake signal generation unit 1302 that generates an emergency brake signal, a response packet, and a reception confirmation information packet based on the received earthquake information.

[0086] Figure 16 shows the control flow of the brake control device. First, when the emergency brake signal generation unit 1302 receives an earthquake information packet (S500), it sends a response packet to the on-board radio device 121 (S510). Next, the emergency brake signal generation unit 1302 determines whether the earthquake information packet is an inspection earthquake information packet or not (S520). If it determines that the earthquake information packet is an inspection earthquake information packet, the emergency brake signal generation unit 1302 proceeds to step S540. On the other hand, if it determines that the earthquake information packet is not an inspection earthquake information packet, the emergency brake signal generation unit 1302 generates an emergency brake signal to stop the railway vehicle if necessary, depending on the content of the earthquake information (S530). Next, if equipment inspection processing is to be performed, the emergency brake signal generation unit 1302 generates reception confirmation information addressed to the earthquake information central device 101 and forwards it to the on-board radio device 121 (S540). The reception confirmation information typically includes the IP address of the brake control device 131. The emergency brake signal generation unit 1302 then waits for a certain period of time to receive a response packet (S550), and if no response packet is received, it resends the reception confirmation information (S540). Meanwhile, if the emergency brake signal generation unit 1302 receives a response packet or times out, it returns to receiving the earthquake information packet (S500).

[0087] The first embodiment has been described above. The first embodiment has the following features.

[0088] The earthquake information transmission system 100 includes an earthquake information central unit 101 (earthquake information generation device) that generates earthquake information based on earthquake sensor information (sensing information) from multiple earthquake sensors, multiple base station radio devices 111 arranged along the railway track, multiple on-board radio devices 121 mounted on each of the multiple railway vehicles running on the railway track, and at least one brake control device 131 mounted on each railway vehicle. The earthquake information central unit 101 transmits earthquake information to at least one base station radio device 111 to 112 selected from the multiple base station radio devices 111 to 112 based on the earthquake sensor information. The base station radio device 111 transmits the received earthquake information to at least one on-board radio device 121 connected to the base station radio device 111. The on-board radio device 121 transmits the received earthquake information to at least one brake control device 131 corresponding to the on-board radio device 121. With the above configuration, the time required from the occurrence of an earthquake until the railway vehicle stops can be shortened.

[0089] Typically, two brake control devices are installed on a single railway vehicle. More than two brake control devices may be installed on a single railway vehicle. In this specification, "railway vehicle" means a train consisting of multiple vehicles arranged in a line. A train is not limited to a train consisting of multiple vehicles arranged in a line; it may consist of only one vehicle. A train is also referred to as a trainset.

[0090] Furthermore, when the earthquake information central unit 101 transmits earthquake information to the base station radio device 111, the destination IP address of the earthquake information packet (IP packet) containing the earthquake information is set to the IP address of the base station radio device 111. With this configuration, the handover device 141 can be omitted. In addition, when the earthquake information central unit 101 transmits earthquake information, it is not necessary to know which base station radio device 111 the railway vehicle is connected to.

[0091] Furthermore, when the earthquake information central device 101 transmits earthquake information to the base station radio device 111, it repeatedly transmits the earthquake information without waiting for the expected maximum response delay time. That is, for example, as a railway vehicle moves, the destination ground radio device may switch, and if an IP packet containing earthquake information is transmitted at that time, packet loss may occur or delays may occur due to retransmitting the IP packet. Also, as a characteristic of IP networks, IP packets can be lost depending on the state of the transmission path, so in order to reliably transmit information, end-to-end retransmission control is necessary. In the case of normal retransmission control such as TCP / IP, a delay occurs because the system checks whether the IP packet has reached its destination using a response packet before retransmitting. In contrast, with the above configuration, since the transmission of earthquake information is repeated without waiting for the expected maximum response delay time, the time required from the occurrence of an earthquake until the railway vehicle stops can be further shortened.

[0092] Furthermore, when the base station radio device 111 transmits earthquake information to the on-board radio device 121, it repeatedly transmits the earthquake information without waiting for the expected maximum response delay time. With the above configuration, for the same reasons as above, the time required from the occurrence of an earthquake until the railway vehicle comes to a stop can be further reduced.

[0093] Furthermore, when the onboard radio device 121 transmits earthquake information to the brake control device 131, it repeatedly transmits the earthquake information without waiting for the expected maximum response delay time. With this configuration, for the same reasons as above, the time required from the occurrence of an earthquake until the railway vehicle comes to a stop can be further reduced.

[0094] Furthermore, the base station radio device 111 transmits destination on-board station information, indicating the on-board station radio device 121 which is the destination for the earthquake information, to the earthquake information central device 101. The brake control device 131 transmits reception confirmation information, indicating that it has received the earthquake information, to the earthquake information central device 101. The earthquake information central device 101 determines whether the transmission of the earthquake information was successful or not by comparing the destination on-board station information with the reception confirmation information. In other words, it is necessary to prevent a situation where, when an earthquake actually occurs, IP packets containing earthquake information cannot reach the vehicle due to IP network configuration errors or malfunctions, or packets generated by other business equipment. For this reason, it is required that the system be able to confirm that earthquake information can reach the brake control device without stopping the vehicle during normal operation, and that if IP packets cannot reach the vehicle due to a malfunction, it can be addressed promptly. Accordingly, the above configuration makes it possible to determine whether the transmission of earthquake information was successful or not. When determining whether the transmission of earthquake information was successful or not during normal operation, it is preferable to use an earthquake information packet for inspection.

[0095] (Second Embodiment) Next, a second embodiment of this disclosure will be described. Figure 17 is a diagram showing the flow of IP packet forwarding. The following description will focus on the differences between this embodiment and the first embodiment described above, and redundant explanations will be omitted.

[0096] In the first embodiment described above, as shown in Figure 6, the destination IP address of the earthquake information packet is switched each time in three stages: when the earthquake information central device 101 transmits to the base station radio device 111, when the base station radio device 111 transmits to the vehicle-mounted radio device 121, and when the vehicle-mounted radio device 121 transmits to the brake control device 131. In contrast, in this embodiment, as shown in Figure 17, when the base station radio device 111 transmits to the vehicle-mounted radio device 121, the destination IP address of the earthquake information packet is set to the IP address of the brake control device 131. In this case, the base station radio device 111 will wait for a response packet from the brake control device 131 and retransmit, so the transmission delay time due to packet loss will increase, but since it is not necessary to change the destination of the earthquake information packet at the vehicle-mounted radio device 121, the configuration of the vehicle-mounted radio device 121 can be simplified.

[0097] Although the present disclosure has been described above with reference to embodiments, the present disclosure is not limited to the embodiments described above. Various modifications to the structure and details of the present disclosure can be made as can be understood by those skilled in the art within the scope of the present disclosure. Furthermore, each embodiment can be combined with other embodiments as appropriate.

[0098] For example, regarding the method for determining the inspection start conditions, in the first embodiment described above, a certain inspection timing was set, and when that inspection timing was met, an inspection was performed on all base station radio equipment 111. However, instead of this, the following determination method can also be adopted.

[0099] Specifically, a list of brake control devices 131 to be inspected is created in advance. All base station radio devices 111 are queryed for the on-board radio devices 121 currently connected to them. From the brake control devices 131 installed on the same railway vehicle as the on-board radio devices 121 obtained as a result of the above query, brake control devices 131 that have not been inspected for a certain period in the past are identified. Then, a list of base station radio devices 111 to which the railway vehicles on which those brake control devices 131 are installed are wirelessly connected is generated. The inspection described above is performed by forwarding earthquake information packets for inspection to the above list of base station radio devices 111. If inspections are simply performed at regular intervals as in the first embodiment above, there is a possibility of inspection bias, such as certain equipment not being inspected. In contrast, the above determination method makes it possible to perform inspections without bias.

[0100] Furthermore, in the first embodiment described above, the brake control device 131 autonomously forwarded confirmation information to the earthquake information central device 101 when it received an earthquake information packet. In contrast, a method could be considered in which the earthquake information central device 101 requests confirmation information from each brake control device 131. In this case, there is the advantage that the earthquake information central device 101 can obtain confirmation information at the time it needs it. However, there is a risk that the railway vehicle may become inactive at that time, making it impossible to access the brake control device 131.

[0101] Alternatively, the system may manage the railway vehicles that have undergone inspection and, if it finds a railway vehicle that has not been connected to the base station radio device 111 for some time, it may inspect the brake control device 131 of that railway vehicle.

[0102] Furthermore, statistics on the railway vehicles to which the system is connected may be collected, and if it is detected that a railway vehicle that has not recently undergone inspection is present, an inspection may be performed on the brake control device 131 of that railway vehicle.

[0103] Furthermore, in the event that an earthquake occurs during a handover, it is conceivable that earthquake information be transmitted to trains that were not connected upon arrival.

[0104] Furthermore, the base station radio equipment 111 can appropriately select whether to set the destination IP address of the earthquake information packet to the IP address of the brake control device 131 or the IP address of the on-board radio equipment 121.

[0105] Furthermore, in the earthquake information transmission system 100, the equipment inspection process shown in step S180 of Figure 9 can be omitted. In this case, the processes related to the equipment inspection process are similarly omitted. For example, the transmission of the destination on-board station information packet shown in step S310 of Figure 12 can be replaced with the transmission of a general response packet.

[0106] Next, the hardware configuration of the earthquake information central device 101 will be described. In the earthquake information central device 101, the earthquake sensor information collection unit 601, the earthquake information determination unit 602, and the equipment inspection processing unit 603 are implemented by processing circuits. The processing circuits may be a processor and memory that execute programs stored in memory, or they may be dedicated hardware. The same applies to the earthquake information conversion unit 902 of the base station radio device 111, the earthquake information conversion unit 1102 of the vehicle-mounted radio device 121, and the emergency brake signal generation unit 1302 of the brake control device 131.

[0107] Figure 18 shows an example of a processing circuit in the earthquake information central device 101, etc., consisting of a processor and memory. When the processing circuit consists of a processor 20000 and memory 20001, each function of the processing circuit in the earthquake information central device 101, etc., is realized by software, firmware, or a combination of software and firmware. The software or firmware is written as a program and stored in memory 20001. In the processing circuit, each function is realized by the processor 20000 reading and executing the program stored in memory 20001. In other words, the processing circuit is equipped with memory 20001 for storing programs that will ultimately be executed by the processing of the earthquake information central device 101, etc. Furthermore, these programs can be said to cause the computer to execute the procedures and methods of the earthquake information central device 101, etc.

[0108] Here, processor 20000 may be a CPU (Central Processing Unit), processing unit, arithmetic unit, microprocessor, microcomputer, or DSP (Digital Signal Processor), etc. Memory 20001 may include, for example, non-volatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), EEPROM (Registered Trademark) (Electrically EPROM), magnetic disks, flexible disks, optical disks, compact disks, minidiscs, or DVDs (Digital Versatile Discs).

[0109] Figure 19 shows an example of a case where the processing circuit of the earthquake information central device 101, etc., is configured with dedicated hardware. When the processing circuit is configured with dedicated hardware, the processing circuit 20002 shown in Figure 19 may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. Each function of the earthquake information central device 101, etc., may be implemented by the processing circuit 20002 on a function-by-function basis, or each function may be implemented together by the processing circuit 20002.

[0110] Furthermore, some functions of the earthquake information central device 101, etc., may be implemented using dedicated hardware, while others may be implemented using software or firmware. In this way, the processing circuit can implement the above-mentioned functions using dedicated hardware, software, firmware, or a combination thereof.

[0111] Each drawing is merely illustrative to illustrate one or more embodiments. Each drawing may be associated with one or more other embodiments rather than with only one specific embodiment. As those skilled in the art will understand, various features or steps described with reference to any one drawing can be combined with features or steps shown in one or more other drawings, for example, to create embodiments not explicitly shown or described. Not all features or steps shown in any one drawing to illustrate an exemplary embodiment are necessarily required, and some features or steps may be omitted. The order of steps shown in any of the drawings may be changed as appropriate.

[0112] Some or all of the above embodiments may also be described as follows, but are not limited to the following: (Note 1) An earthquake information generation device that generates earthquake information based on sensing information from multiple earthquake sensors, Multiple base station radio equipment units are positioned along the railway tracks, Multiple onboard radio equipment is installed on each of the multiple railway vehicles that run on the aforementioned railway track, Each railway vehicle is equipped with at least one brake control device, Includes, The earthquake information generating device transmits the earthquake information to at least one base station radio device selected from the plurality of base station radio devices based on the sensing information. The at least one base station radio device transmits the received earthquake information to at least one vehicle-mounted radio device connected to the base station radio device. The at least one on-board radio device transmits the received earthquake information to the at least one brake control device corresponding to the on-board radio device. Earthquake information transmission system. (Note 2) When the earthquake information generating device transmits the earthquake information to the at least one base station radio device, the destination IP address of the IP packet containing the earthquake information is set to the IP address of the base station radio device. The earthquake information transmission system described in Appendix 1. (Note 3) When the earthquake information generating device transmits the earthquake information to the at least one base station radio device, it repeats the transmission of the earthquake information without waiting for the expected maximum response delay time. The earthquake information transmission system described in Appendix 1. (Note 4) When the at least one base station radio device transmits the earthquake information to the at least one vehicle-mounted radio device, it repeats the transmission of the earthquake information without waiting for the expected maximum response delay time. The earthquake information transmission system described in Appendix 1. (Note 5) When the at least one on-board radio device transmits the earthquake information to the at least one brake control device, it repeats the transmission of the earthquake information without waiting for the expected maximum response delay time. The earthquake information transmission system described in Appendix 1. (Note 6) The at least one base station radio device transmits to the earthquake information generation device transfer destination on-board station information indicating the at least one on-board station radio device that is the destination for the earthquake information, The at least one brake control device transmits a reception confirmation message indicating that it has received the earthquake information to the earthquake information generating device. The earthquake information generation device determines whether the transmission of the earthquake information is successful or not by comparing the destination on-board station information with the reception confirmation information. The earthquake information transmission system described in Appendix 1. (Note 7) A base station radio device positioned along a railway track, A receiving unit that receives earthquake information from an earthquake information generation device that generates earthquake information based on sensing information from multiple earthquake sensors, A transmitting unit that transmits the received earthquake information to at least one vehicle-mounted radio unit connected to the base station radio unit, Includes, When the transmitting unit transmits the received earthquake information to at least one vehicle-mounted radio device connected to the base station radio device, it repeats the transmission of the earthquake information without waiting for the expected maximum response delay time. Base station radio equipment. (Note 8) A radio onboard station installed on a railway vehicle that runs on railway tracks, A receiving unit that receives earthquake information from base station radio equipment positioned along the railway tracks, A transmitting unit that transmits the received earthquake information to at least one brake control device corresponding to the on-board radio device, Includes, When the transmitting unit transmits the received earthquake information to at least one brake control device corresponding to the on-board radio device, it repeats the transmission of the earthquake information without waiting for the expected maximum response delay time. Onboard station radio equipment. (Note 9) An earthquake information generation device that generates earthquake information based on sensing information from multiple earthquake sensors, Multiple base station radio equipment units are positioned along the railway tracks, Multiple onboard radio equipment is installed on each of the multiple railway vehicles that run on the aforementioned railway track, Each railway vehicle is equipped with at least one brake control device, including, An earthquake information transmission method in an earthquake information transmission system, The earthquake information generating device transmits the earthquake information to at least one base station radio device selected from the plurality of base station radio devices based on the sensing information. The at least one base station radio device transmits the received earthquake information to at least one vehicle-mounted radio device connected to the base station radio device. The at least one on-board radio device transmits the received earthquake information to the at least one brake control device corresponding to the on-board radio device. Methods for transmitting earthquake information. (Note 10) A program that causes a computer to execute the earthquake information transmission method described in Appendix 9. (Note 11) The earthquake information transmission system according to Appendix 1, characterized in that when the at least one base station radio device transmits the received earthquake information to at least one vehicle-mounted radio device connected to the base station radio device, it transmits the information using a radio method with a particularly low error rate.

[0113] Some or all of the elements (e.g., configuration and function) described in Appendices 2 to 6 that are dependent on Appendice 1 may also be dependent on Appendices 9 and 10 in the same manner as those described in Appendices 2 to 6. Some or all of the elements described in any appendice may be applicable to various hardware, software, recording means, systems, and methods for recording software. [Explanation of symbols]

[0114] 101 Earthquake information central equipment 111~112 Base station wireless equipment 121~125 Onboard station radio equipment 131-135 Brake control device 601 Earthquake Sensor Information Collection Unit 602 Earthquake Information Judgment Department 603 Equipment Inspection Processing Unit 604 IP Network Processing Unit 901 IP Network Processing Unit 902 Earthquake Information Conversion Unit 903 Wireless Communication Section 1101 Wireless Communication Section 1102 Earthquake Information Conversion Unit 1103 IP Network Processing Unit 1301 IP Network Processing Unit 1302 Emergency brake signal generation unit

Claims

1. An earthquake information generation device that generates earthquake information based on sensing information from multiple earthquake sensors, Multiple base station radio equipment units are positioned along the railway tracks, Multiple onboard radio equipment is installed on each of the multiple railway vehicles that run on the aforementioned railway track, Each railway vehicle is equipped with at least one brake control device, Includes, The earthquake information generating device transmits the earthquake information to at least one base station radio device selected from the plurality of base station radio devices based on the sensing information. The at least one base station radio device transmits the received earthquake information to at least one vehicle-mounted radio device connected to the base station radio device. The at least one on-board radio device transmits the received earthquake information to the at least one brake control device corresponding to the on-board radio device. Earthquake information transmission system.

2. When the earthquake information generating device transmits the earthquake information to the at least one base station radio device, the destination IP address of the IP packet containing the earthquake information is set to the IP address of the base station radio device. The earthquake information transmission system according to claim 1.

3. When the earthquake information generating device transmits the earthquake information to the at least one base station radio device, it repeats the transmission of the earthquake information without waiting for the expected maximum response delay time. The earthquake information transmission system according to claim 1.

4. When the at least one base station radio device transmits the earthquake information to the at least one vehicle-mounted radio device, it repeats the transmission of the earthquake information without waiting for the expected maximum response delay time. The earthquake information transmission system according to claim 1.

5. When the at least one on-board radio device transmits the earthquake information to the at least one brake control device, it repeats the transmission of the earthquake information without waiting for the expected maximum response delay time. The earthquake information transmission system according to claim 1.

6. The at least one base station radio device transmits to the earthquake information generation device destination information indicating the at least one on-board radio device that is the destination for transmitting the earthquake information. The at least one brake control device transmits a reception confirmation message indicating that it has received the earthquake information to the earthquake information generating device. The earthquake information generation device determines whether the transmission of the earthquake information is successful or not by comparing the destination on-board station information with the reception confirmation information. The earthquake information transmission system according to claim 1.

7. A base station radio device positioned along a railway track, A receiving unit that receives earthquake information from an earthquake information generation device that generates earthquake information based on sensing information from multiple earthquake sensors, A transmitting unit that transmits the received earthquake information to at least one vehicle-mounted radio unit connected to the base station radio unit, Includes, When the transmitting unit transmits the received earthquake information to at least one vehicle-mounted radio device connected to the base station radio device, it repeats the transmission of the earthquake information without waiting for the expected maximum response delay time. Base station radio equipment.

8. A radio onboard station installed on a railway vehicle that runs on railway tracks, A receiving unit that receives earthquake information from base station radio equipment positioned along the railway tracks, A transmitting unit that transmits the received earthquake information to at least one brake control device corresponding to the on-board radio device, Includes, When the transmitting unit transmits the received earthquake information to at least one brake control device corresponding to the on-board radio device, it repeats the transmission of the earthquake information without waiting for the expected maximum response delay time. Onboard station radio equipment.

9. An earthquake information generation device that generates earthquake information based on sensing information from multiple earthquake sensors, Multiple base station radio equipment units are positioned along the railway tracks, Multiple onboard radio equipment is installed on each of the multiple railway vehicles that run on the aforementioned railway track, Each railway vehicle is equipped with at least one brake control device, including, An earthquake information transmission method in an earthquake information transmission system, The earthquake information generating device transmits the earthquake information to at least one base station radio device selected from the plurality of base station radio devices based on the sensing information. The at least one base station radio device transmits the received earthquake information to at least one vehicle-mounted radio device connected to the base station radio device. The at least one on-board radio device transmits the received earthquake information to the at least one brake control device corresponding to the on-board radio device. Earthquake information transmission method.

10. A program that causes a computer to execute the earthquake information transmission method described in claim 9.

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