Driving assistance system and method, video distribution system and method

Abstract

To provide a method by which a number of a line into which a vehicle formation comes is recognized and an image corresponding to the recognized line is transmitted to the vehicle formation.SOLUTION: An embodiment of this invented operation support system has a first wireless system to detect a number of a line which a vehicle formation comes into and a second wireless system to acquire the image data of a taken platform of the station from the imaging device. The second wireless system provides image data of the platform corresponding to the line number detected by the first wireless system to the vehicle formation coming into the number of the line detected by the first wireless system.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention provides Driving assistance system and method, video distribution system and method Regarding. [Background technology]

[0002] Conventionally, there has been known a technology that displays an image of the platform to the driver of a rolling stock to assist the driver in operating the rolling stock. For example, a train operation assistance system described in Patent Document 1 is known as this type of technology. The train operation assistance system of Patent Document 1 uses a camera installed on the platform to capture an image of the area near the boundary between the platform and the train, transmits the captured image to the train via wireless communication, and the train receives the captured image and displays the image on a liquid crystal display installed in the driver's seat of the train. This allows the driver to monitor the displayed image and operate the train while ensuring safety, and enables the driver to monitor the status of the platform and the train, such as the presence or absence of passengers, from the driver's seat, thereby ensuring safe train operation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-104189 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-described train operation assistance system may be unable to recognize the track number into which the rolling stock set has entered and transmit the video corresponding to the recognized track number.

[0005] The present disclosure has been made in consideration of such circumstances, and provides a system that can recognize the track number into which a rolling stock formation enters and transmit an image corresponding to the recognized track number to the rolling stock formation. Driving assistance system and method, video distribution system and method The purpose is to provide. [Means for solving the problem]

[0006] The present disclosure has been made to solve the above-mentioned problems, and one aspect of the present disclosure is a system including a first wireless system that detects a track number into which a rolling stock formation has entered, and a second wireless system that acquires video data of a station platform from an imaging device, wherein the second wireless system provides the video data of the platform corresponding to the track number detected by the first wireless system to the rolling stock formation that has entered the track number detected by the first wireless system; The first wireless system is a wireless system that uses ultra-wideband wireless communication (Ultra Wide Band), and includes a ground positioning unit arranged corresponding to the track number and an on-board positioning unit mounted on the rolling stock set. The first wireless system detects that the rolling stock set has approached the platform of the station based on a distance derived by communication between the ground positioning unit and the on-board positioning unit, and detects the correspondence between the rolling stock set and the track number based on identification information corresponding to the ground positioning unit and identification information corresponding to the on-board positioning unit. , a driving assistance system.

[0007] Another aspect of the present disclosure is This is a wireless system that uses ultra-wideband wireless communication and is equipped with a ground positioning unit that is arranged corresponding to the track number and an on-board positioning unit that is installed on the vehicle formation. a step of a first radio system detecting a track number into which a rolling stock set has entered; a step of a second radio system acquiring image data of a station platform from an imaging device; and a step of the second radio system providing the image data of the platform corresponding to the track number detected by the first radio system to the rolling stock set that has entered the track number detected by the first radio system, The first wireless system detects that the train set has approached the platform of the station based on the distance derived by communication between the ground positioning unit and the on-board positioning unit, and the first wireless system detects the correspondence between the train set and the platform based on identification information corresponding to the ground positioning unit and identification information corresponding to the on-board positioning unit. , a driving assistance method.

[0008] Another aspect of the present disclosure is a management system that notifies track number information to a terminal device mounted on a rolling stock set based on a ground positioning unit that wirelessly communicates with an on-board positioning unit mounted on the rolling stock set and acquires an identifier of the on-board positioning unit, a communication unit that communicates with the ground positioning unit and a terminal device mounted on the rolling stock set, and the identifier of the on-board positioning unit acquired by the ground positioning unit and information of the terminal device acquired through communication by the communication unit. Device and a video distribution unit that distributes video data of a station platform to the terminal device, The rolling stock set includes a computing device that controls the terminal device to transmit the identifier of the on-board positioning unit regardless of the communication connection status of the terminal device, the communication unit receives the identifier of the on-board positioning unit from the terminal device after the communication connection with the terminal device is established, and the management device notifies the track number information based on information about the terminal device as the sender of the identifier of the on-board positioning unit when the identifier of the on-board positioning unit received by the communication unit matches the identifier of the on-board positioning unit acquired by the terrestrial positioning unit. It is a video distribution system.

[0009] Another aspect of the present disclosure is a management system that notifies track number information to a terminal device mounted on a rolling stock set based on a ground positioning unit that wirelessly communicates with an on-board positioning unit mounted on the rolling stock set and acquires an identifier of the on-board positioning unit, a communication unit that communicates with the ground positioning unit and a terminal device mounted on the rolling stock set, and the identifier of the on-board positioning unit acquired by the ground positioning unit and information of the terminal device acquired through communication by the communication unit. Device and a video distribution unit that distributes video data of a station platform to the terminal device, The rolling stock set includes a computing unit that controls the terminal device to transmit an identifier of the on-board positioning unit when it is determined that the terminal device is within the service area of ​​the terminal device, the communication unit receives the identifier of the on-board positioning unit from the terminal device, and the management device notifies the track number information based on information about the terminal device as the sender of the identifier of the on-board positioning unit when the identifier of the on-board positioning unit received by the communication unit matches the identifier of the on-board positioning unit acquired by the terrestrial positioning unit. It is a video distribution system.

[0010] Another aspect of the present disclosure is a management system that notifies track number information to a terminal device mounted on a rolling stock set based on a ground positioning unit that wirelessly communicates with an on-board positioning unit mounted on the rolling stock set and acquires an identifier of the on-board positioning unit, a communication unit that communicates with the ground positioning unit and a terminal device mounted on the rolling stock set, and the identifier of the on-board positioning unit acquired by the ground positioning unit and information of the terminal device acquired through communication by the communication unit. Device and a video distribution unit that distributes video data of a station platform to the terminal device, the rolling stock set includes a computing device that, when detecting that the rolling stock set has approached the station, establishes a communication connection with the communication unit and controls the terminal device to transmit an identifier of the on-board positioning unit, the communication unit receives the identifier of the on-board positioning unit from the terminal device, and, when the identifier of the on-board positioning unit received by the communication unit matches the identifier of the on-board positioning unit acquired by the ground positioning unit, the management device notifies the track number information based on information about the terminal device as the sender of the identifier of the on-board positioning unit. It is a video distribution system.

[0011] Another aspect of the present disclosure is a ground positioning unit installed in a station. but, a step of wirelessly communicating with an on-board positioning unit mounted on the rolling stock set and acquiring an identifier of the on-board positioning unit; The communications department establishing a communication connection with a terminal device mounted on the rolling stock; The management device notifying the terminal device of track number information based on the identifier of the on-board positioning unit acquired by the ground positioning unit and information on the terminal device with which a communication connection has been established; The video distribution department and delivering video data of a station platform to the terminal device, the rolling stock set transmits the identifier of the on-board positioning unit regardless of the communication connection state of the terminal device, the communication unit receives the identifier of the on-board positioning unit from the terminal device after the communication connection with the terminal device is established, and the management device notifies the terminal device of the track number information based on information about the terminal device as the sender of the identifier of the on-board positioning unit when the received identifier of the on-board positioning unit matches the identifier of the on-board positioning unit acquired by the ground positioning unit. It is a video distribution method.

[0012] Another aspect of the present disclosure is a ground positioning unit installed in a station. but,a step of wirelessly communicating with an on-board positioning unit mounted on the rolling stock set and acquiring an identifier of the on-board positioning unit; The communications department establishing a communication connection with a terminal device mounted on the rolling stock; The management device notifying the terminal device of track number information based on the identifier of the on-board positioning unit acquired by the ground positioning unit and information on the terminal device with which a communication connection has been established; The video distribution department and delivering video data of a station platform to the terminal device, the rolling stock set includes a computing device that controls the terminal device to transmit an identifier of the on-board positioning unit when it is determined that the terminal device is within the service area of ​​the rolling stock set, the communication unit receives the identifier of the on-board positioning unit from the terminal device, and the management device notifies the terminal device of the track number information based on information about the terminal device as the sender of the identifier of the on-board positioning unit when the identifier of the on-board positioning unit received by the communication unit matches the identifier of the on-board positioning unit acquired by the terrestrial positioning unit. It is a video distribution method.

[0013] Another aspect of the present disclosure is a ground positioning unit installed in a station. but, a step of wirelessly communicating with an on-board positioning unit mounted on the rolling stock set and acquiring an identifier of the on-board positioning unit; The communications department establishing a communication connection with a terminal device mounted on the rolling stock; The management device notifying the terminal device of track number information based on the identifier of the on-board positioning unit acquired by the ground positioning unit and information on the terminal device with which a communication connection has been established; The video distribution department and delivering video data of a station platform to the terminal device, a computing device that, when detecting that the rolling stock formation has approached the station, establishes a communication connection with the communication unit and controls the terminal device to transmit an identifier of the on-board positioning unit, wherein the communication unit receives the identifier of the on-board positioning unit from the terminal device, and when the identifier of the on-board positioning unit received by the communication unit matches the identifier of the on-board positioning unit acquired by the ground positioning unit, the management device notifies the track number information based on information about the terminal device as the sender of the identifier of the on-board positioning unit. It is a video distribution method. [Effects of the Invention]

[0014] According to one aspect of the present invention, the track number into which the rolling stock set has entered can be recognized, and an image corresponding to the recognized track number can be transmitted to the rolling stock set. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic diagram showing an example of a driving assistance system 1 according to an embodiment. [Figure 2] FIG. 1 is a top view showing an example of the arrangement of a UWB sensor, a UWB tag, a 5G antenna device, and a 5G terminal device in an embodiment. [Figure 3]FIG. 1 is a diagram illustrating an example of a TDoA method. [Figure 4] FIG. 1 is a diagram illustrating an example of a TWR method. [Figure 5] 1 is a block diagram illustrating an example of a driving assistance system according to an embodiment. [Figure 6] FIG. 2 is a block diagram showing another example of the driving assistance system according to the embodiment. [Figure 7] FIG. 3 is a diagram showing an example of a processing procedure of the first terrestrial-based method in the embodiment. [Figure 8] FIG. 10 is a diagram illustrating an example of a signal format for a train detection notification. [Figure 9] FIG. 10 is a diagram illustrating an example of a signal format of a connection composition request. [Figure 10] FIG. 10 is a diagram illustrating an example of a signal format of a connection composition response. [Figure 11] FIG. 10 is a diagram illustrating an example of a signal format of a video acquisition request. [Figure 12] FIG. 10 is a diagram illustrating an example of a signal format of a video acquisition response. [Figure 13] FIG. 10 is a diagram showing an example of a processing procedure of the second terrestrial-based method. [Figure 14] FIG. 10 is a diagram illustrating an example of a signal format for notifying a connection composition. [Figure 15] FIG. 2 is a diagram showing an example of a processing procedure of the first on-board system in the embodiment. [Figure 16] FIG. 10 is a diagram illustrating an example of a signal format for train information notification. [Figure 17] FIG. 10 is a diagram showing an example of a processing procedure of the second on-board system in the embodiment. [Figure 18] FIG. 10 is a diagram showing an example of a processing procedure of the third on-board system in the embodiment. [Figure 19] FIG. 10 is a diagram showing an example of a processing procedure of the fourth on-board system in the embodiment. [Figure 20] FIG. 10 is a diagram illustrating an example of a signal format for a track detection notification. DETAILED DESCRIPTION OF THE INVENTION

[0016] A driving assistance system and method, a video distribution system and method, a management device, a rolling stock configuration system and video display method, and a computing device to which the present invention is applied will be described below with reference to the drawings.

[0017] <Outline of the embodiment> A driving assistance system according to an embodiment includes a first wireless system and a second wireless system. The first wireless system detects the track number into which a rolling stock set has entered. The second wireless system acquires video data of an image of a platform from an imaging device. The second wireless system provides the video data of the platform corresponding to the track number detected by the first wireless system to the rolling stock set that has entered the track number detected by the first wireless system. The first wireless system detects the track number into which the rolling stock set has entered, for example, using UWB (ultra wide band). The second wireless system provides the video data of the platform corresponding to the track number detected by the first wireless system to the rolling stock set, using 5G (fifth generation mobile communication system) or local 5G. The driving assistance system assists the driving of the rolling stock set by presenting the video data to the driver of the rolling stock set.

[0018] <Example of configuration of driving assistance system> FIG. 1 is a schematic diagram illustrating an example of a driving assistance system 1 according to an embodiment. The driving assistance system 1 includes, for example, a UWB sensor 10, a UWB tag 20, a 5G antenna device 30, and a 5G terminal device 40. The UWB sensor 10 and the UWB tag 20 communicate wirelessly using a frequency band known as UWB. For example, the UWB sensor 10 is installed on a structure or the like installed on a station platform, and the UWB tag 20 is mounted on a train set entering the station platform. The 5G antenna device 30 and the 5G terminal device 40 communicate wirelessly using a communication method known as a fifth-generation mobile communication system. For example, the 5G antenna device 30 is a radio unit (RU) and is installed on a station platform, and the 5G terminal device 40 is installed on a train set entering the station platform. The RU is an RF transceiver and has the functionality of a lower physical layer defined by 3GPP (Third Generation Partnership Project).

[0019] FIG. 2 is a top view showing an example of the arrangement of UWB sensors, UWB tags, 5G antenna devices, and 5G terminal devices according to an embodiment. In FIG. 2, one station has two platforms, platform A and platform B, and four tracks, platform 1 through platform 4. The direction of travel of the train sets on platforms 1 and 2 is opposite to the direction of travel of the train sets on platforms 3 and 4. Long train sets 1a, 2a, 3a, and 4a and short train sets 1b, 2b, 3b, and 4b are parked on each platform. Some UWB sensors 10 are provided at positions where the train sets 1a, 2a, 3a, and 4a are parked, allowing them to communicate with UWB tags 20. Other UWB sensors 10 are provided at positions where the train sets 1b, 2b, 3b, and 4b are parked, allowing them to communicate with UWB tags 20. The 5G antenna device 30 provided on platform A is located in a position where it can communicate with the 5G terminal devices 40 in vehicle formations 1a, 1b, 2a, and 2b, and the 5G antenna device 30 provided on platform B is located in a position where it can communicate with the 5G terminal devices 40 in vehicle formations 3a, 3b, 4a, and 4b. In this way, the driving assistance system 1 may arrange the 5G antenna devices 30 in correspondence with multiple track platforms; that is, rather than providing a 5G antenna device 30 for each track platform, it is sufficient to arrange only the number of 5G antenna devices 30 required to cover the inside of the station from the standpoints of reducing costs and interference.

[0020] Fig. 3 is a diagram showing an example of the TDoA method. Fig. 4 is a diagram showing an example of the TWR method. The driving assistance system 1 estimates (locates) the position of a UWB tag using the TDoA (Time Differential of Arrival) method or the TWR (Two Way Ranging) method. In the embodiments, a UWB tag or a UWB sensor installed at a station may be read as a "ground positioning unit," and a UWB tag or a UWB sensor installed in a rolling stock may be read as an "on-board positioning unit."

[0021] In FIG. 3, the driving assistance system 1 calculates the position of a UWB tag using UWB sensors 1, 2, and 3. The TDoA method measures the position of a UWB tag by the following steps (1) to (5): (1) UWB sensors 1, 2, and 3 are time-synchronized with one another. The synchronized time may be absolute time or a relative time that synchronizes UWB sensors 1 to 3. (2) UWB sensors 1 to 3 acquire the reception time of the signal transmitted from the UWB tag. (3) The propagation time (ToF: Time on Flight) ToF-1 to 3 from the UWB tag to each of UWB sensors 1 to 3 is estimated. (4) Circles are drawn with UWB sensors 1 to 3 at their centers, with distances corresponding to the propagation times. (5) The stop position is estimated from the area where the three circles corresponding to UWB sensors 1 to 3 overlap.

[0022] In the TWR method, communications (1) to (6) are performed multiple times between each UWB sensor and the UWB tag. For example, as shown in Figure 4, (1) the UWB sensor transmits a signal indicating transmission time t1 to the UWB tag at transmission time t1. (2) The UWB tag receives the signal from the UWB sensor at reception time t2. This allows the UWB tag to estimate the propagation time from transmission time t1 and reception time t2. (3) The UWB tag transmits a signal indicating reception time t2 and transmission time t3 to the UWB sensor at transmission time t3. (4) The UWB sensor receives the signal from the UWB tag at reception time t4. This allows the UWB sensor to estimate the propagation time from transmission time t1 and reception time t2, and from transmission time t3 and reception time t4. (5) For example, by detecting the propagation time between a UWB sensor installed on a platform and a UWB tag when the sensor enters within a certain distance, the track number and stop position can be estimated. As with the TDoA method, circles are drawn with UWB sensors 1 to 3 at the center, with the distance corresponding to the propagation time, and the stop position can be estimated from the range where the three circles corresponding to UWB sensors 1 to 3 overlap.

[0023] The propagation time resolution is proportional to the signal bandwidth. For example, by using an ultra-wideband wireless signal of 500 MHz, a high time resolution of 2 ns (1 / 500 MHz) or less can be achieved, enabling UWB tag positioning with a distance accuracy of 60 cm or less. For example, compared to wireless LAN with a bandwidth of 20 MHz or Bluetooth (registered trademark) with a bandwidth of 1 MHz, the ultra-wideband 500 MHz can achieve high time resolution. Furthermore, the time period of UWB signals is shorter than that of wireless LAN or Bluetooth. As a result, UWB can separate direct and reflected waves with high accuracy, enabling positioning even when walls or metal are present around the UWB sensor or UWB tag.

[0024] 5 is a block diagram showing an example of a driving assistance system according to an embodiment. The driving assistance system 1 includes, for example, a station edge server device 100 included in station equipment room facilities, a command server device 200 located in a command equipment room, a camera device 50, a video synthesis unit 60, and a video codec unit 70. The UWB sensor 10, the camera device 50, the video synthesis unit 60, and the video codec unit 70 are, for example, facilities located for each track. The 5G antenna device 30 is, for example, facilities located for each of a plurality of tracks.

[0025] The command side server device 200 is a server device that issues commands to the station edge server devices 100 installed at multiple stations. The station edge server devices 100 are server devices that perform processing at each station. The camera devices 50 capture images of the surroundings of the platform and track, and supply the video data to the video synthesis unit 60. The video synthesis unit 60 synthesizes the video data captured by the multiple camera devices 50. The video codec unit 70 performs predetermined codec processing on the video data synthesized by the video synthesis unit 60 and supplies the resulting data to the station edge server device 100.

[0026] FIG. 6 is a block diagram showing an example of a functional configuration of a driving assistance system according to an embodiment. The driving assistance system 1 functions as a base station device that communicates with a 5G terminal device 40. The driving assistance system 1 includes a 5G antenna device 30, a SW, a DU (Distributed Unit), and a CU (Central Unit) as functions of a base station device, and a core NW (5GC) as a higher-layer function of the base station. The SW is connected to multiple 5G antenna devices 30. The DUs are multiple distributed nodes that have functions from the upper physical layer to the RLC (Radio Link Control) layer defined by 3GPP and transmit and receive wireless signals via the 5G antenna device 30. The CUs are aggregation nodes that have functions of the PDU (Protocol Data Unit Layer) layer defined by 3GPP and process control data and video data via multiple DUs. The DUs and CUs are connected to the 5G antenna device 30 via optical cables. The SW may connect multiple 5G antenna devices 30 to one DU and one CU. A GMC (Grand Master Clock) and a GPS (Global Positioning System) antenna are connected to the SW.

[0027] The core network is also called 5GC (Core Network). 5GC is a group of network control devices that connect multiple base station devices and application servers. 5GC has U-Plane and C-Plane functions. The U-Plane function is realized by a UFP (User Plane Function) that transfers video data as user data in packets. The C-Plane function performs control processing for establishing communications by sending and receiving control data. The C-Plane function is realized by an AMF (Access and Mobility Management Function) that handles subscriber authentication, security, and terminal location management, and an SMF (Session Management Function) that manages sessions. The U-Plane function may be distributed to each station or to one representative station among multiple stations to reduce delays during data transfer and distribute the load.

[0028] FIG. 7 is a block diagram illustrating an example of a driving assistance system according to an embodiment. The rolling stock set includes an on-board positioning unit 20, a 5G terminal device 40, a computing device 42, and a monitor device 44. The 5G terminal device 40 communicates using Orthogonal Frequency Division Multiplexing (OFDM). If the driving assistance system 1 supports local 5G, the 5G terminal device 40 may communicate using OFDM, using a frequency band permitted by the railway operator. If the driving assistance system 1 supports network slicing, the 5G terminal device 40 may communicate using a slice permitted by the railway operator. Network slicing is a technology for virtually dividing (slicing) a network infrastructure and building a logical network that provides services according to the application. The computing device 42 controls the on-board positioning unit 20, the 5G terminal device 40, and the monitor device 44 by executing a program using, for example, a CPU or the like. The monitor device 44 is a video display device that allows the driver of the rolling stock set to view an image.

[0029] The operation assistance system 1 includes, for example, a station edge server device 100 included in station equipment room facilities, a command side server device 200 located in a command equipment room, a camera device 50, a video synthesis unit 60, and a video codec unit 70. The UWB sensor 10, the camera device 50, the video synthesis unit 60, and the video codec unit 70 are, for example, facilities located for each track. The 5G antenna device 30 is, for example, facilities located for each of several tracks.

[0030] The driving assistance system 1 functions as a base station device that communicates with a 5G terminal device 40. The driving assistance system 1 includes a 5G antenna device 30, SWs (switches) 110 and 210, a DU (distributed unit) 120, and a CU (central unit) 130 as functions of the base station device, and a core NW (5GC) 220 as a higher layer function of the base station. The SW 110 is connected to multiple 5G antenna devices 30. The DUs 120 are multiple distributed nodes that have functions from the upper physical layer to the RLC (radio link control) layer specified by 3GPP and transmit and receive wireless signals via the 5G antenna devices 30. The CU 130 is an aggregation node that has functions of the PDU (protocol data unit layer) layer specified by 3GPP and processes control data and video data via multiple DUs 120. The DUs 120 and CU 130 are connected to the 5G antenna device 30 via optical cables. The SW110 may connect a plurality of 5G antenna devices 30 to one DU 120 and one CU 130. A Grand Master Clock (GMC) and a Global Positioning System (GPS) antenna are connected to the SW210.

[0031] The station edge server device 100 includes, for example, a SW (switch) 110, a DU 120, a CU 130, a UPF 140, a management device 150, and a video distribution device 160. The SW 110 is connected to a UWB sensor 10, a 5G antenna device 30, and a video codec unit 70 included in the station. The SW 110, the DU 120, and the CU 130, together with a 5G antenna device 30 (RU) connected to the SW 110, constitute a base station device for local 5G. The base station device communicates with the 5G terminal device 40 using OFDM. If the driving assistance system 1 supports local 5G, the base station device may communicate using OFDM using a frequency band permitted by the railway operator. If the driving assistance system supports network slicing, the base station device may communicate using a slice assigned to the railway operator. The UPF 140 performs processing to realize U-Plane functions in the 5G core network (5GC).

[0032] The ground positioning unit 10, camera device 50, video synthesis unit 60, and video codec unit 70 are provided for each track. The 5G antenna device 30 does not need to be provided for each track; it is sufficient to install the number of devices necessary to establish the desired local 5G communication area within the station in order to reduce costs and interference. The CU 130 and UPF 140 do not need to be provided for each station; they may be provided for multiple stations in order to reduce costs as long as the transmission delay time of the video data is within an acceptable range.

[0033] The command side server device 200 is a server device that issues commands to the station edge server devices 100 installed at multiple stations. The station edge server devices 100 are server devices that perform processing at each station. The camera devices 50 capture images of the surroundings of the platform and track, and supply the video data to the video synthesis unit 60. The video synthesis unit 60 synthesizes the video data captured by the multiple camera devices 50. The video codec unit 70 performs predetermined codec processing on the video data synthesized by the video synthesis unit 60 and supplies the resulting data to the station edge server device 100.

[0034] The command side server device 200 includes a SW (switch) 210, a 5G core network (5GC) 220, and a GMC 230. The SW 210 is connected to the SWs 110 of each of the multiple stations. The 5G core network (5GC) 220 mainly performs processing to realize the C-Plane function. The C-Plane function includes, for example, processing to establish and disconnect communication between a 5G terminal device 40 and a base station device. The GMC (Grand Master Clock) 230 is connected to the GPS antenna 300, and performs time synchronization processing between the RU and DU using packet communication based on the Precision Time Protocol (PTP) defined by IEEE (Institute of Electrical and Electronics Engineers) 1588 to achieve time synchronization of wireless signals to prevent interference between wireless signals between different operators and 5G systems.

[0035] The core NW is also referred to as 5GC (Core Network) 220. 5GC 220 is a group of network control devices that connect multiple base station devices and application servers. 5GC 220 has a U-Plane function and a C-Plane function. The U-Plane function is realized by, for example, UFP (User Plane Function) 140, which transfers video data as user data in packets. The C-Plane function performs control processing for establishing communication by sending and receiving control data. The C-Plane function is realized by, for example, AMF (Access and Mobility Management Function), which performs subscriber authentication, security, and terminal location management, and SMF (Session Management Function), which manages sessions. The U-Plane function may be distributed to each station or to one representative station among multiple stations to reduce delays during data transfer and distribute the load.

[0036] The driving assistance system 1 can reduce transmission delays that occur within the 5G network by distributing multiple DUs 120 and CUs 130 at each station. Furthermore, the driving assistance system 1 disposes a UPF 140 at each station and a 5GC 220 serving as a C-Plane processing unit at a single location (centralized) in the command server device 200. The command server device 200 may be disposed at each of multiple stations. Distributing a UPF 140 at each station can reduce transmission delays that occur within the 5G network (second wireless system), and can display video data captured by the camera device 50 installed at each platform on the monitor device 44 in real time.

[0037] FIG. 6 is a block diagram showing another example of a driving assistance system according to an embodiment. In the driving assistance system 1 shown in FIG. 5, a CU 130 and a UPF 140 are provided at each station. However, this is not limited thereto. As shown in FIG. 6, in another driving assistance system 1, a CU 130# may be provided in the command server device 200, and the function of the UPF 140 may be provided in the 5GC 220#. The CU 130# processes data for the 5G antenna devices 30 and the DUs 120 provided at multiple stations. The 5GC 220# transfers video data acquired at multiple stations. In this way, as long as the transmission delay time of the video data is within an acceptable range, from the viewpoint of cost reduction, the command server device 200 may be provided with CUs 130# connected to multiple stations, and the 5GC 220# may be provided with a UPF that processes video data transferred at multiple stations.

[0038] 5 and 6, the 5G antenna device 30, DU120, CU130, UPF140, and 5GC220 are an example of a second communication system and communication unit that establish a communication connection with the 5G terminal device 40, acquire video data, and transmit the acquired video data to the 5G terminal device 40.

[0039] The following describes the wayside-based system in the above-mentioned operation assistance system 1. In the wayside-based system, the management device 150 as a wayside facility plays a central role in detecting the track number into which the rolling stock set has entered, and provides video data to the rolling stock set.

[0040] Fig. 7 is a diagram showing an example of a processing procedure of the first ground-based method according to the embodiment. Fig. 7 illustrates the operation assistance system 1 in which two rolling stock formations #1 and #2 enter the platform of station #1 and the station edge server device 100 of station #1 is provided with the DU 120, the CU 130, and the UPF 140.

[0041] The 5G terminal device 40 always performs a cell search outside the 5G connection area of ​​each station. When the train set #1 moves toward station #1 and the 5G terminal device 40 enters the 5G connection area, a 5G connection procedure is executed between the 5G terminal device 40, the 5G antenna device 30 (RU #1), the DU 120, the CU 130, and the 5G 220 (S10). As a result, the driving assistance system 1 establishes a communication connection between the UE (5G terminal device 40), the base station (RU, CU, DU), and the 5G 220. Note that the establishment of the communication connection through the 5G connection procedure (S10) may be executed in a frequency band corresponding to a predetermined railway operator. For example, the 5G terminal device 40 has a network identifier assigned to the railway operator preset in its SIM (Subscriber Identity Module) card, and performs a cell search using the network identifier.

[0042] After the 5G connection procedure (S10), the 5GC220 determines the destination station based on the information of the cell from which the communication connection has been established. The 5GC220 transmits a terminal connection notification S20 including terminal information to the management device 150. The terminal information is, for example, the IP address of the 5G terminal device 40. The management device 150 uses the acquired IP address etc. to update a list of connected 5G terminal devices 40 that have established a communication connection with the local 5G of station #1 (hereinafter referred to as the connected terminal list) (S22).

[0043] Asynchronously with the 5G connection procedure (S10), the UWB tag 20 of rolling stock set #1 transmits a radio signal including its own tag information. The radio signal transmitted from the UWB tag 20 is detected by the UWB sensor 10 of station #1 (S14). The UWB sensor 10 determines whether the distance from the UWB tag 20 remains equal to or less than a certain distance for a predetermined period of time (S16). The certain distance is, for example, the distance between the UWB tag 20 and the installation position of the UWB sensor 10 when the rolling stock set is stopped at a stopping position. The predetermined period of time is the time during which it can be determined that the rolling stock set has approached the stopping position and stopped. If the distance from the UWB tag 20 remains equal to or less than the certain distance for a predetermined period of time (S16: NO), the UWB sensor 10 terminates this processing procedure.

[0044] If the distance between the UWB sensor 10 and the UWB tag 20 remains equal to or shorter than a certain distance for a certain period of time (S16: YES), the UWB sensor 10 transmits a train detection notification (S18) to the management device 150. FIG. 8 is a diagram showing an example of a signal format of the train detection notification. The train detection notification (S18) includes a message ID (S18a), tag information (S18b) such as an identifier for identifying the UWB tag 20, and track number information (S18c) of the rolling stock set #1 detected using the UWB sensor 10. The track number information may be, for example, the tag information (identifier) ​​of the UWB sensor 10. As a result, the driving assistance system 1 determines that the rolling stock set #1 has stopped at the platform of station #1 using the UWB sensor 10 and the UWB tag 20 asynchronously with the 5G connection procedure. The driving assistance system 1 can also detect the correspondence between the rolling stock set and the track number based on the identification information (tag information) corresponding to the UWB tag 20 and the identification information (tag information) corresponding to the UWB sensor 10.

[0045] In response to receiving the train detection notification (S18), the management device 150 transmits a connection request (S24) to the rolling-stock set. FIG. 9 is a diagram showing an example of a signal format of the connection request. The connection request (S24) includes a message ID (S24a), tag information (S24b) of the UWB sensor 10, and track number information (S24c). The tag information and track number information included in the connection request (S24) correspond to the tag information and track number information included in the train detection notification (S18). The management device 150 transmits the connection request (S24) to each of the 5G terminal devices 40 of all rolling-stock sets #1 and #2 included in the connected terminal list. In response to this, the management device 150 obtains the identifiers of the UWB tags 20 mounted on the rolling-stock set from the UWB sensors 10, and notifies the rolling-stock set of track number information corresponding to the track number into which the rolling-stock set has entered, based on the obtained identifiers of the UWB tags 20 and information from the 5G terminal devices 40.

[0046] The 5G terminal device 40 of rolling-stock set #1 receives the connection set request (S24). The calculation device 42 inquires whether the tag information included in the connection set request (S24) is the tag information of the UWB tag 20 provided on rolling-stock set #1 on which the 5G terminal device 40 is installed (S28). The calculation device 42 pre-stores the tag information of the UWB tag 20 provided on rolling-stock set #1 on which the calculation device 42 is installed. Since the tag information included in the connection set request (S24) is the tag information of the UWB tag 20 provided on rolling-stock set #1, the calculation device 42 transmits a connection set response (S30) to the management device 150. FIG. 10 is a diagram showing an example of the signal format of the connection set response. The connection set response (S30) includes a message ID (S30a), tag information of the UWB sensor 10 (S30b), 5G terminal information (S30c), and padding (S30d). Furthermore, the arithmetic device 42 transmits a video acquisition request (S32) including track number information to the video distribution device 160. FIG. 11 is a diagram showing an example of a signal format of the video acquisition request. The video acquisition request (S32) includes a message ID (S32a), tag information of the UWB sensor 10 (S32b), 5G terminal information (S32c), and track number information (S32d). Meanwhile, the arithmetic device 42 of rolling-stock set #2 terminates processing (S28#) because the tag information included in the connection set request (S24) is not tag information of the UWB tag 20 provided on rolling-stock set #2.

[0047] The connection composition response (S30) includes, but is not limited to, 5G terminal information (S30c), and may not include 5G terminal information (S30c). The padding (S30d) is a code string inserted to unify the signal format of the connection composition response (S30) transmitted to the management device 150 and the video acquisition request (S32) transmitted to the video distribution device 160.

[0048] In response to receiving the video acquisition request (S32), the video distribution device 160 returns a video acquisition response (S34) to the calculation device 42. FIG. 12 is a diagram showing an example of a signal format of the video acquisition response. The video acquisition response (S34) includes a message ID (S34a), tag information (S34b) of the UWB sensor 10, 5G terminal information (S34c), and padding (S34d). The video distribution device 160 then provides the calculation device 42 with video information corresponding to the track number information included in the video acquisition request (S32). This enables the calculation device 42 to display the video on the monitor device 44.

[0049] When rolling stock set #1 moves to exit the platform and the 5G terminal device 40 leaves the 5G connection area, the DU 120 and the CU 130 detect that the 5G connection has been disconnected (S38) and execute a 5G disconnection procedure with the 5GC 220 (S40). When the 5G disconnection procedure is completed, the 5GC 220 transmits a terminal disconnection notification (S42) including terminal information to the management device 150. The management device 150 updates the connected terminal list to delete the terminal information included in the terminal disconnection notification (S42) from the list (S44). Note that the calculation device 42 may, for example, stop presenting the video when the 5G connection is disconnected.

[0050] According to the first ground-based system, the management device 150 notifies all 5G terminal devices 40 with which a 5G connection has been established of the tag information and track number information of the UWB tag 20, thereby making it possible to provide video data to the rolling stock formation corresponding to the tag information of the UWB tag 20. As a result, according to the first ground-based system, it is not necessary to register information about the UWB tags 20 and 5G terminal devices 40 mounted on the rolling stock formation in the management device 150 in advance, thereby reducing the amount of work required for system installation, breakdowns, and maintenance.

[0051] 13 is a diagram showing an example of a processing procedure of the second terrestrial-based system. Note that the same parts as those in the first terrestrial-based system are denoted by the same reference numerals and description thereof will be omitted. In the second ground-based system, the management device 150 manages the correspondence between the tag information of the UWB tags 20 mounted on all rolling stock sets and the terminal information of the 5G terminal devices 40. The management device 150 receives a terminal connection notification (S20) from the 5GC 220 and receives a train detection notification (S18) from the UWB sensor 10. The management device 150 associates (S100) the terminal information included in the terminal connection notification (S20) with the tag information included in the train detection notification (S18). This allows the management device 150 to inquire about rolling stock sets that are connected via 5G. The terminal information may be, for example, an IMSI (International Mobile Subscription Identity) or the like.

[0052] The management device 150 transmits a connection train set notification (S102) including track number information to the 5G terminal device 40 of rolling-stock set #1. FIG. 14 is a diagram showing an example of a signal format of the connection train set notification. The connection train set notification (S102) includes a message ID (S102a), tag information (S102b) of the UWB tag 20, 5G terminal information (S102c), and track number information (S102d). Note that the connection train set notification (S102) includes the 5G terminal information (S102c), but is not limited to this, and it does not have to include the 5G terminal information (S102c).

[0053] The arithmetic device 42 acquires the track number information included in the connection formation notification (S102) via the 5G terminal device 40, thereby recognizing the track number into which rolling-stock formation #1 has entered (S104). The arithmetic device 42 transmits a video acquisition request (S32) including the track number information to the video distribution device 160. In response to receiving the video acquisition request (S32), the video distribution device 160 replies with a video acquisition response (S34) to the arithmetic device 42. Thereafter, the video distribution device 160 provides the arithmetic device 42 with video information (S36) corresponding to the track number information included in the video acquisition request (S32). This enables the arithmetic device 42 to display the video on the monitor device 44.

[0054] According to the second ground-based system, the management device 150 manages in advance the correspondence between the tag information of the UWB tags 20 mounted on the rolling stock set and the terminal information of the 5G terminal device 40, so that the track number information included in the train detection notification (S18) can be linked to the terminal information corresponding to the tag information included in the train detection notification (S18). This allows the video distribution device 160 to notify the 5G terminal device 40 of the track number information and transmit video data to the 5G terminal device 40 that has notified the track number information. As a result, according to the driving assistance system 1, it is possible to start providing video data without having to query tag information in the rolling stock set as in the first ground-based system.

[0055] The following describes the on-board system in the above-described driving assistance system 1. In the on-board system, the computing device 42 as on-board equipment takes the lead in requesting the management device 150 for video data.

[0056] FIG. 15 is a diagram showing an example of a processing procedure of the first on-board system according to the embodiment. Note that the same reference numerals are used to designate the same processes as those described above, and detailed description thereof will be omitted. The arithmetic unit 42 controls the 5G terminal device 40 to transmit the identifier of the UWB tag 20, regardless of the communication connection status of the 5G terminal device 40. The arithmetic unit 42 outputs a train information notification (S200) including tag information of the UWB tag 20 to the 5G terminal device 40, for example, constantly or at predetermined intervals. If the 5G terminal device 40 is outside the 5G connection area, the communication connection is not established, and therefore the output train information notification (S200) is discarded (S202). When the rolling stock set #1 moves to enter station #1 and the 5G terminal device 40 enters the 5G connection area, the 5G terminal device 40 executes a 5G connection procedure (S10). When a 5G communication connection is established, the 5G terminal device 40 transmits a train information notification (S200) to the management device 150. FIG. 16 is a diagram showing an example of a signal format of the train information notification. The train information notification (S200) includes a message ID (S200a), tag information (S200b) of the UWB tag 20, 5G terminal information (S200c), and padding (S200d). Note that the train information notification (S200) includes the 5G terminal information (S200c), but is not limited to this, and does not necessarily need to include the 5G terminal information (S200c). Furthermore, the padding (S200d) is a code string inserted to unify the signal formats of the train information notification (S200) transmitted to the management device 150 and the video acquisition request (S32) transmitted to the video distribution device 160.

[0057] The management device 150 receives the train information notification (S200) and the train detection notification (S18), confirms that the tag information included in the train information notification (S200) matches the tag information included in the train detection notification (S18), and associates the track number information with the 5G terminal information (S204). The management device 150 transmits a connection formation notification (S206) to the 5G terminal device 40 that sent the train information notification (S200).

[0058] The 5G terminal device 40 outputs a connection formation notification (S206) to the calculation device 42. The calculation device 42 recognizes the track number into which rolling-stock set #1 has entered from the track number information included in the connection formation notification (S206) (S208). The calculation device 42 transmits a video acquisition request (S32) including the track number information to the video distribution device 160. In response to receiving the video acquisition request (S32), the video distribution device 160 replies with a video acquisition response (S34) to the calculation device 42. Thereafter, the video distribution device 160 provides the calculation device 42 with video information corresponding to the track number information included in the video acquisition request (S32). This enables the calculation device 42 to display the video on the monitor device 44.

[0059] According to the first on-board system, the calculation device 42 transmits the tag information of the UWB tag 20 to the management device 150 in response to the establishment of a 5G connection, and therefore the management device 150 can transmit track number information to the 5G terminal device 40 on the condition that the tag information in the train detection notification (S18) matches the tag information in the train information notification (S200). As a result, according to the first on-board system, it is possible to eliminate the need for the management device 150 to manage terminal information in advance.

[0060] FIG. 17 is a diagram showing an example of a processing procedure for the second on-board system according to the embodiment. Note that the same reference numerals are used to designate the same processes as those described above, and detailed description thereof will be omitted. The calculation device 42 outputs a presence information inquiry (S300) to the 5G terminal device 40, for example, constantly or at predetermined intervals. If the 5G terminal device 40 is not present in the 5G area, the processing ends (S302: NO). When the rolling stock #1 moves to enter station #1 and the 5G terminal device 40 enters the 5G connection area, the 5G connection procedure is executed (S10). When the 5G communication connection is established, the calculation device 42 determines that the 5G terminal device 40 is present in the 5G area (S302: YES) and transmits a train information notification (S306) including tag information of the UWB tag 20 to the management device 150.

[0061] The 5G terminal device 40 may store a cell ID set for each station in advance, and establish a 5G connection when the cell ID acquired by performing a cell search matches the stored cell ID. This makes it possible to prevent erroneous connections, such as establishing a 5G connection at an unintended station.

[0062] The management device 150 receives the train information notification (S306) and the train detection notification (S18), confirms that the tag information included in the train information notification (S306) matches the tag information included in the train detection notification (S18), and associates the track number information with the tag information of rolling-stock formation #1 (S308). This allows the management device 150 to inquire about 5G-connected rolling-stock formations. The management device 150 transmits a connected formation notification (S310) to the 5G terminal device 40 of rolling-stock formation #1.

[0063] The 5G terminal device 40 outputs a connection formation notification (S310) to the calculation device 42. The calculation device 42 recognizes the track number into which rolling-stock set #1 has entered from the track number information included in the connection formation notification (S310) (S312). The calculation device 42 transmits a video acquisition request (S32) including the track number information to the video distribution device 160. In response to receiving the video acquisition request (S32), the video distribution device 160 replies with a video acquisition response (S34) to the calculation device 42. Thereafter, the video distribution device 160 provides the calculation device 42 with video information corresponding to the track number information included in the video acquisition request (S32). This enables the calculation device 42 to display the video on the monitor device 44.

[0064] According to the second on-board-based system, the tag information of the UWB tag 20 is transmitted to the management device 150 when the 5G terminal device 40 is present in a 5G connection area, and therefore the management device 150 can transmit track number information to the 5G terminal device 40 on the condition that the tag information in the train detection notification (S18) matches the tag information in the train information notification (S306). As a result, according to the second on-board-based system, it is possible to eliminate the need to manage terminal information in advance in the management device 150. Furthermore, according to the second on-board-based system, it is possible to reduce the number of packets sent from the calculation device 42 to the 5G terminal device 40 compared to the first on-board-based system.

[0065] FIG. 18 is a diagram showing an example of a processing procedure of the third on-board mainly system in the embodiment. Note that parts similar to the processes described above are assigned the same reference numerals, and detailed explanations will be omitted. The third on-board mainly system uses on-board devices mounted on the rolling stock set. The on-board devices only need to be configured to detect the approach of the rolling stock set to a station. For example, the on-board devices can obtain the current position of the rolling stock set when an on-board transponder mounted on the rolling stock set passes over a ground coil installed on the track.

[0066] When the on-board device detects that the rolling stock is approaching a station (S400), it outputs an approach notification (S402) to the calculation device 42. In response to the output of the approach notification (S402), the calculation device 42 outputs a line connection request (S404) to the 5G terminal device 40. This causes the 5G terminal device 40 to start a 5G connection procedure (S10). Next, the calculation device 42 causes the 5G terminal device 40 to transmit a train information notification (S406) including tag information of the UWB tag 20 to the management device 150.

[0067] The management device 150 receives the train information notification (S406) and the train detection notification (S18), confirms that the tag information included in the train information notification (S406) matches the tag information included in the train detection notification (S18), and associates the track number information with the tag information of rolling-stock formation #1 (S308). This allows the management device 150 to inquire about 5G-connected rolling-stock formations. The management device 150 transmits a connected formation notification (S310) to the 5G terminal device 40 of rolling-stock formation #1.

[0068] The 5G terminal device 40 outputs a connection formation notification (S310) to the calculation device 42. The calculation device 42 recognizes the track number into which rolling-stock set #1 has entered from the track number information included in the connection formation notification (S310) (S408). The calculation device 42 transmits a video acquisition request (S32) including the track number information to the video distribution device 160. In response to receiving the video acquisition request (S32), the video distribution device 160 replies with a video acquisition response (S34) to the calculation device 42. Thereafter, the video distribution device 160 provides the calculation device 42 with video information corresponding to the track number information included in the video acquisition request (S32). This enables the calculation device 42 to display the video on the monitor device 44.

[0069] When the on-board device detects that the rolling stock has left the station (S410), it outputs an exit notification (S412) to the calculation device 42. In response to the output of the exit notification (S412), the calculation device 42 outputs a line disconnection request (S414) to the 5G terminal device 40. As a result, the 5G terminal device 40 executes a 5G disconnection procedure (S416).

[0070] According to the third on-board system, existing on-board equipment on the rolling stock can be used to detect the approach of the rolling stock to a station, and the 5G connection procedure can be initiated at the detection timing. As a result, according to the third on-board system, a 5G connection can be quickly established and video data can be provided to the rolling stock. Furthermore, according to the third on-board system, the 5G connection can be quickly disconnected by detecting the exit of the rolling stock using on-board equipment.

[0071] 19 is a diagram showing an example of a processing procedure of the fourth on-board-based system in the embodiment. Note that parts similar to those of the above-mentioned processes are given the same reference numerals, and detailed description thereof will be omitted. In the above-mentioned first ground-based system, second ground-based system, first on-board-based system, second on-board-based system, and third on-board-based system, the on-board positioning units mounted on the rolling stock are UWB tags, and the terrestrial positioning units installed at stations are UWB sensors, but in the fourth on-board-based system, the on-board positioning units mounted on the rolling stock are UWB sensors, and the terrestrial positioning units installed at stations are UWB tags.

[0072] The 5G terminal device 40 always performs a cell search outside the 5G connection area of ​​each station. When the vehicle formation #1 moves to enter the station #1 and the 5G terminal device 40 enters the 5G connection area, the 5G terminal device 40 executes a 5G connection procedure (S10).

[0073] Asynchronously with the 5G connection procedure (S10), the UWB tag at station #1 transmits a wireless signal (S500) including its own tag information (including track number information). The wireless signal transmitted from the UWB tag is detected by the UWB sensor of rolling stock set #1 (S502). The UWB sensor determines whether a period during which the distance to the UWB tag is equal to or less than a certain value has continued (S504). If a period during which the distance to the UWB tag is equal to or less than a certain value has not continued (S504: NO), the processing ends. If a period during which the distance to the UWB tag is equal to or less than a certain value has continued (S504: YES), the UWB sensor outputs a track number detection notification (S506) to the calculation device 42. Figure 20 is a diagram showing an example of a signal format of the track number detection notification. The track number detection notification (S506) includes a message ID (S506a), track number information corresponding to the tag ID of the UWB tag (S506b), and distance information (S506c). As a result, the driving assistance system 1 determines that the vehicle formation #1 has stopped at the platform of station #1 using the UWB sensor and the UWB tag, asynchronously with the 5G connection procedure.

[0074] In response to receiving the track number detection notification (S506), the calculation device 42 transmits a video acquisition request (S32) including track number information to the video distribution device 160. In response to receiving the video acquisition request (S32), the video distribution device 160 replies to the calculation device 42 with a video acquisition response (S34). Thereafter, the video distribution device 160 provides the calculation device 42 with video information corresponding to the track number information included in the video acquisition request (S32). This allows the calculation device 42 to display the video on the monitor device 44. Thereafter, when rolling-stock set #1 moves to leave the platform and the UWB sensor of rolling-stock set #1 moves away from the UWB tag at station #1 by more than a certain distance, the calculation device 42 stops displaying the video (S508). Also, when the 5G terminal device 40 leaves the 5G connection area, the DU 120 and the CU 130 detect that the 5G connection establishment has been disconnected (S38) and execute a 5G disconnection procedure with the 5GC 220 (S40).

[0075] According to the fourth on-board system, tag information from a UWB tag at a station is acquired by a UWB sensor on the rolling stock, and the track number corresponding to the tag information of the UWB tag can be recognized by the calculation device 42. The fourth on-board system eliminates the need for the management device 150 to match track numbers with rolling stock formations.

[0076] As described above, the driving assistance system 1 according to the embodiment includes a first wireless system that detects the track number into which the rolling stock set has entered, and a second wireless system that acquires video data of the station platform from the camera device 50, and the second wireless system can provide the video data of the platform corresponding to the track number detected by the first wireless system to the rolling stock set that has entered the track number detected by the first wireless system. As a result, the driving assistance system 1 according to the embodiment can recognize the track number into which the rolling stock set has entered, and quickly transmit video corresponding to the recognized track number to the rolling stock set.

[0077] <Variation 1> In the above-described operation assistance system 1, the first and second ground-based systems, and the first to third on-board based systems, UWB tags are mounted on the rolling stock and UWB sensors are placed at stations, but this is not limiting, and UWB sensors may be mounted on the rolling stock and UWB tags may be placed at stations. In this case, the UWB sensors mounted on the rolling stock communicate with the UWB tags placed at the stations to detect that the rolling stock has stopped, and after a 5G connection is established, they transmit track number information to the management device 150.

[0078] Furthermore, in the fourth on-board system described above, UWB sensors are mounted on the rolling stock and UWB tags are placed at stations. However, this is not limiting, and UWB tags may be mounted on the rolling stock and UWB sensors may be placed at stations. In this case, the UWB sensors placed at stations may detect that the rolling stock has stopped by communicating with the UWB tags mounted on the rolling stock, and may notify the computing device 42 of this fact after a 5G connection is established. This allows the computing device 42 to transmit a video acquisition request to the video distribution device 160 that includes tag information from the UWB tags mounted on the rolling stock as track number information.

[0079] <Variation 2> The tag information of the on-board positioning unit (UWB tag or UWB sensor) mounted on the train set may include information indicating the direction of travel. Furthermore, the on-board positioning unit may transmit information indicating the direction of travel in addition to the tag information for identifying the on-board positioning unit. As a result, the management device 150 may, for example, transmit information indicating the direction of travel to the calculation device 42, have the calculation device 42 recognize the direction of travel of the train set, and request video corresponding to the direction of travel from the video distribution device 160.

[0080] <Variation 3> The terrestrial positioning unit may include information indicating a stopping position within the track platform in the track platform identification information corresponding to the terrestrial positioning unit. The terrestrial positioning unit acquires, for example, the position of the on-board positioning unit derived through communication with the on-board positioning unit as the stopping position within the track platform. This allows the terrestrial positioning unit to determine whether the vehicle formation is stopped at a predetermined stopping position within the track platform. Furthermore, the terrestrial positioning unit may transmit the stopping position within the track platform in addition to the track platform information to the management device 150, and cause the management device 150 to transmit the stopping position within the track platform to the calculation device 42. This allows the calculation device 42 to request video corresponding to the stopping position within the track platform from the video distribution device 160.

[0081] Although each embodiment and variant example has been described, these are merely examples and are not intended to limit the scope of the present invention. For example, one of the embodiments or variant examples, or a part of each embodiment or a part of each variant example, may be combined with one or more other embodiments or one or more other variant examples to realize one aspect of the present invention.

[0082] In addition, the programs for executing the processes of management device 150 and calculation device 42 in this embodiment may be recorded on a computer-readable recording medium, and the programs recorded on the recording medium may be read into a computer system and executed, thereby performing the various processes described above related to management device 150 and calculation device 42.

[0083] Note that the term "computer system" here may include hardware such as the OS and peripheral devices. Furthermore, if a WWW system is used, the term "computer system" also includes the homepage provision environment (or display environment). Furthermore, "computer-readable recording media" refers to storage devices such as flexible disks, magneto-optical disks, ROMs, and writable non-volatile memory such as flash memory, portable media such as CD-ROMs, and hard disks built into computer systems.

[0084] Furthermore, the term "computer-readable recording medium" also includes a storage medium that stores a program for a certain period of time, such as a volatile memory (e.g., DRAM (Dynamic Random Access Memory)) within a computer system that serves as a server or client when the program is transmitted via a network such as the Internet or a communication line such as a telephone line. The program may also be transmitted from a computer system that stores the program in a storage device or the like to another computer system via a transmission medium or by transmission waves in the transmission medium.

[0085] Here, the "transmission medium" for transmitting the program refers to a medium that has the function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may also be one that realizes part of the above-mentioned functions. Furthermore, it may be a so-called differential file (differential program) that can realize the above-mentioned functions in combination with a program already recorded in a computer system.

[0086] Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and designs within the scope of the present invention that do not deviate from the gist of the present invention are also included. [Explanation of symbols]

[0087] 1... Driving assistance system, 10... UWB sensor, 20... UWB tag, 30... 5G antenna device, 40... 5G terminal device, 42... Computing device, 44... Monitor device, 50... Camera device, 60... Video synthesis unit, 70... Video codec unit, 100... Station edge server device, 110... SW, 120... DU, 130... CU, 140... UPF, 150 Management device, 160... Video distribution device, 200... Command side server device, 220... 5GC, 230... GMC

Claims

1. a first radio system that detects a track number into which a rolling stock formation has entered; a second wireless system that acquires video data of a station platform from an imaging device, the second radio system provides, to the rolling stock set that has entered the track number detected by the first radio system, video data of a platform corresponding to the track number detected by the first radio system; the first wireless system It is a wireless system that uses ultra wide band wireless communication. a ground positioning unit arranged corresponding to the track number; an on-board positioning unit mounted on the vehicle formation, detecting that the rolling stock formation has approached a platform of the station based on the distance derived through communication between the ground positioning unit and the on-board positioning unit; A driving assistance system that detects the correspondence between the vehicle formation and the track number based on identification information corresponding to the ground positioning unit and identification information corresponding to the on-board positioning unit.

2. the second wireless system a terminal device mounted on the rolling stock and performing Orthogonal Frequency Division Multiplexing (OFDM) communication; At least a portion of the base station device and a 5G core network are disposed in the station and establish a communication connection with the terminal device; The driving assistance system of claim 1 .

3. the second wireless system a terminal device mounted on the rolling stock set and performing Orthogonal Frequency Division Multiplexing (OFDM) communication using a frequency band permitted by a railway operator; At least a portion of the base station device and a 5G core network are disposed in the station and establish a communication connection with the terminal device; The driving assistance system of claim 1 .

4. the second wireless system a terminal device that communicates using OFDM (Orthogonal Frequency Division Multiplexing) using slices authorized by a railway operator; At least a portion of the base station device and a 5G core network are disposed in the station and establish a communication connection with the terminal device; The driving assistance system of claim 1 .

5. the detection of the track number by the first wireless system and the communication by the second wireless system are performed asynchronously. The driving assistance system according to claim 1 .

6. 6. The driving assistance system according to claim 5, wherein the second wireless system establishes a communication connection between a terminal device mounted on the vehicle formation and a base station device and a 5G core network located at the station before the first wireless system completes detection of the track platform.

7. 2. The driving assistance system according to claim 1, further comprising: a management device that acquires information relating to the track number detected by the first wireless system, and causes the second wireless system to transmit video data corresponding to the track number detected by the first wireless system to the rolling stock formation based on the acquired information relating to the track number.

8. the second wireless system includes a U-Plane processing unit that processes the video data and a C-Plane processing unit that processes control data; The U-Plane processing unit is arranged for each station, and the C-Plane processing unit is arranged for each of a plurality of stations. The driving assistance system according to claim 1 .

9. the second wireless system includes a U-Plane processing unit that processes the video data and a C-Plane processing unit that processes control data; The U-Plane processing unit and the C-Plane processing unit are arranged at each of a plurality of stations. The driving assistance system according to claim 1 .

10. the second wireless system includes a wireless node having an antenna, a plurality of distributed nodes that transmit and receive wireless signals via the wireless node, and an aggregation node that processes control data and video data via the plurality of distributed nodes; the plurality of distributed nodes and the aggregation node are arranged for each of the stations; The driving assistance system according to claim 1 .

11. the second wireless system includes a wireless node having an antenna, a plurality of distributed nodes that transmit and receive wireless signals via the wireless node, and an aggregation node that processes control data and video data via the plurality of distributed nodes; the plurality of distributed nodes are arranged for each station, and the aggregation node is arranged for each of a plurality of stations; The driving assistance system according to claim 1 .

12. The driving assistance system according to claim 10 or 11, wherein the second wireless system arranges the wireless nodes corresponding to a plurality of track platforms.

13. A first wireless system using ultra-wideband wireless communication, the first wireless system having a ground positioning unit arranged corresponding to the track number and an on-board positioning unit mounted on the vehicle formation, detecting the track number into which the vehicle formation has entered; a step in which the second wireless system acquires video data of an image of a station platform from an imaging device; a step in which the second radio system provides, to the rolling stock set that has entered the track number detected by the first radio system, video data of a platform corresponding to the track number detected by the first radio system; the first wireless system detects that the rolling stock set has approached a platform of the station based on the distance derived through communication between the ground positioning unit and the on-board positioning unit; a driving assistance method in which the first wireless system detects a correspondence between the vehicle formation and the track number based on identification information corresponding to the ground positioning unit and identification information corresponding to the on-board positioning unit.

14. a ground positioning unit that wirelessly communicates with an on-board positioning unit mounted on the rolling stock configuration and acquires an identifier of the on-board positioning unit; a communication unit that communicates with a terminal device mounted on the rolling stock; a management device that notifies the terminal device of track number information based on the identifier of the on-board positioning unit acquired by the ground positioning unit and information about the terminal device acquired through communication by the communication unit; a video distribution unit that distributes video data of a station platform to the terminal device; Equipped with the rolling stock set includes a computing device that controls the terminal device to transmit the identifier of the on-board positioning unit regardless of a communication connection state of the terminal device; the communication unit receives an identifier of the on-board positioning unit from the terminal device after a communication connection with the terminal device is established; a management device that, when the identifier of the on-board positioning unit received by the communication unit matches the identifier of the on-board positioning unit acquired by the terrestrial positioning unit, notifies the track number information based on information about the terminal device as the sender of the identifier of the on-board positioning unit.

15. a ground positioning unit that wirelessly communicates with an on-board positioning unit mounted on the rolling stock configuration and acquires an identifier of the on-board positioning unit; a communication unit that communicates with a terminal device mounted on the rolling stock; a management device that notifies the terminal device of track number information based on the identifier of the on-board positioning unit acquired by the ground positioning unit and information about the terminal device acquired through communication by the communication unit; a video distribution unit that distributes video data of a station platform to the terminal device; Equipped with the rolling stock set includes a computing device that controls the terminal device to transmit an identifier of the on-board positioning unit when it is determined that the terminal device is within a service area; the communication unit receives an identifier of the on-board positioning unit from the terminal device; a management device that, when the identifier of the on-board positioning unit received by the communication unit matches the identifier of the on-board positioning unit acquired by the terrestrial positioning unit, notifies the track number information based on information about the terminal device as the sender of the identifier of the on-board positioning unit.

16. a ground positioning unit that wirelessly communicates with an on-board positioning unit mounted on the rolling stock configuration and acquires an identifier of the on-board positioning unit; a communication unit that communicates with a terminal device mounted on the rolling stock; a management device that notifies the terminal device of track number information based on the identifier of the on-board positioning unit acquired by the ground positioning unit and information about the terminal device acquired through communication by the communication unit; a video distribution unit that distributes video data of a station platform to the terminal device; Equipped with the rolling stock set includes a computing device that controls the terminal device to establish a communication connection with the communication unit and transmit an identifier of the on-board positioning unit when it detects that the rolling stock set has approached the station; the communication unit receives an identifier of the on-board positioning unit from the terminal device; A video distribution system in which, when the identifier of the on-board positioning unit received by the communication unit matches the identifier of the on-board positioning unit acquired by the terrestrial positioning unit, the management device notifies the track number information based on information about the terminal device as the sender of the identifier of the on-board positioning unit.

17. the management device notifies all terminal devices that have established a communication connection with the communication unit of the identifier of the on-board positioning unit and the track number information; the video distribution unit provides the video data to a terminal device corresponding to the identifier of the on-board positioning unit notified by the management device. The video distribution system according to claim 16.

18. the management device manages a correspondence relationship between the identifier of the on-board positioning unit and information of the terminal device, and notifies the track number information to the terminal device corresponding to the identifier of the on-board positioning unit acquired by the ground positioning unit; the video distribution unit provides the video data to the terminal device to which the management device has notified the track number information. The video distribution system according to claim 16.

19. a ground positioning unit disposed at a station wirelessly communicating with an on-board positioning unit mounted on a rolling stock set, and acquiring an identifier of the on-board positioning unit; a communication unit establishing a communication connection with a terminal device mounted on the rolling stock set; a step in which a management device notifies the terminal device of track number information based on the identifier of the on-board positioning unit acquired by the ground positioning unit and information on the terminal device with which a communication connection has been established; a step in which a video distribution unit distributes video data of a station platform to the terminal device; the rolling stock set transmits the identifier of the on-board positioning unit regardless of the communication connection state of the terminal device, the communication unit receives an identifier of the on-board positioning unit from the terminal device after a communication connection with the terminal device is established; A video distribution method in which, when the identifier of the on-board positioning unit received by the management device matches the identifier of the on-board positioning unit acquired by the terrestrial positioning unit, the management device notifies the terminal device of the track number information based on information about the terminal device as the sender of the identifier of the on-board positioning unit.

20. a ground positioning unit disposed at a station wirelessly communicating with an on-board positioning unit mounted on a rolling stock set, and acquiring an identifier of the on-board positioning unit; a communication unit establishing a communication connection with a terminal device mounted on the rolling stock set; a step in which a management device notifies the terminal device of track number information based on the identifier of the on-board positioning unit acquired by the ground positioning unit and information on the terminal device with which a communication connection has been established; a step in which a video distribution unit distributes video data of a station platform to the terminal device; the rolling stock set includes a computing device that controls the terminal device to transmit an identifier of the on-board positioning unit when it is determined that the terminal device is within a service area of ​​the rolling stock set, the communication unit receives an identifier of the on-board positioning unit from the terminal device, a management device that, when the identifier of the on-board positioning unit received by the communication unit matches the identifier of the on-board positioning unit acquired by the terrestrial positioning unit, notifies the terminal device of the track number information based on information about the terminal device as the sender of the identifier of the on-board positioning unit.

21. a ground positioning unit disposed at a station wirelessly communicating with an on-board positioning unit mounted on a rolling stock set, and acquiring an identifier of the on-board positioning unit; a communication unit establishing a communication connection with a terminal device mounted on the rolling stock set; a step in which a management device notifies the terminal device of track number information based on the identifier of the on-board positioning unit acquired by the ground positioning unit and information on the terminal device with which a communication connection has been established; a step in which a video distribution unit distributes video data of a station platform to the terminal device; a computing unit that controls the terminal device to establish a communication connection with the communication unit and transmit an identifier of the on-board positioning unit when it is detected that the rolling stock set has approached the station; the communication unit receives an identifier of the on-board positioning unit from the terminal device, a management device that, when the identifier of the on-board positioning unit received by the communication unit matches the identifier of the on-board positioning unit acquired by the terrestrial positioning unit, notifies the track number information based on information about the terminal device as the sender of the identifier of the on-board positioning unit.

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