Wireless communication system and wireless device

Abstract

To provide a wireless communication system capable of distributing a plurality of pieces of transmission data to a plurality of wireless lines without requiring a transmission control device.SOLUTION: A wireless communication system includes a plurality of wireless devices, each connected to a different wireless line, that transmit transmission data using the wireless line to which it is connected, and a plurality of output devices that output the transmission data to the plurality of wireless devices. The wireless devices determine whether each piece of transmission data input from the plurality of output devices can be transmitted to the wireless line to which the wireless device is connected, and output transmission data that the wireless device determine can be transmitted to the wireless line, and do not output transmission data that the transmission data is determined not to be transmitted to the wireless line.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a wireless communication system, and more particularly to communication control in a wireless communication system having a plurality of data output devices and a plurality of wireless lines. [Background technology]

[0002] For example, Patent Document 1 listed below discloses a data transmission system equipped with a transmission control device that determines the transmission order and transmission path of each frame based on the allowable delay time and the transmission time of the transmission path that are predetermined for each frame of data (transmission data) to be transmitted. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-195023 A Summary of the Invention [Problem to be solved by the invention]

[0004] The data transmission system of Patent Document 1 is configured such that a transmission control device distributes data received from a transmission device to a plurality of transmission paths, and therefore requires a transmission control device in addition to the transmission device and devices that configure the transmission paths.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a wireless communication system that is capable of distributing multiple transmission data to multiple wireless lines without requiring a transmission control device. [Means for solving the problem]

[0006] The wireless communication system according to the present disclosure is a wireless communication system that performs wireless communication using a plurality of wireless lines, and includes a plurality of wireless devices that are each connected to a different one of the wireless lines and transmit transmission data using the wireless line to which they are connected, and a plurality of output devices that output the transmission data to the plurality of wireless devices, and the wireless devices determine whether or not each of the transmission data input from the plurality of output devices can be transmitted to the wireless line to which they are connected, and output the transmission data that they determine can be transmitted to the wireless line, and do not output the transmission data that they determine cannot be transmitted to the wireless line. Effect of the Invention

[0007] According to the wireless communication system of the present disclosure, each of the multiple wireless devices determines whether or not to transmit transmission data, and a wireless line is selected based on that determination, making it possible to distribute multiple transmission data to multiple wireless lines without using a transmission control device that distributes transmission paths. [Brief description of the drawings]

[0008] [Figure 1] 1 is a configuration diagram of a wireless communication system according to first and second embodiments. [Diagram 2] FIG. 4 is a diagram showing an example of setting information held in a ground database in the first embodiment. [Diagram 3] 1 is a block diagram of a radio device according to a first embodiment and a terrestrial radio device according to a second embodiment. [Figure 4] 4] FIG. 4 is a diagram showing an example of setting information held in a database management unit of the on-board radio device of the first embodiment. [Diagram 5] 4] FIG. 4 is a diagram showing an example of setting information held in a database management unit of the terrestrial radio of the first embodiment. [Figure 6] 4 is a flowchart showing the operation of the on-board radio device of the first embodiment. [Figure 7] 4 is a flowchart showing the operation of the terrestrial radio device of the first embodiment. [Figure 8]10 is a flowchart showing a process for changing transmitting radio unit allocation performed by the terrestrial database when an abnormality occurs in a radio unit in the first and second embodiments. [Figure 9] FIG. 4 is a diagram showing an example of how setting information is changed when an abnormality occurs in the terrestrial wireless device in the first embodiment. [Figure 10] FIG. 4 is a diagram showing an example of how setting information is changed when an abnormality occurs in the on-board wireless device in the first embodiment. [Figure 11] FIG. 11 is a configuration diagram of a wireless communication system according to a modification of the first embodiment and the second embodiment. [Figure 12] FIG. 11 is a diagram showing an example of setting information distributed to an on-board radio in a modification of the first embodiment. [Figure 13] FIG. 13 is a diagram showing an example of setting information distributed to a terrestrial radio device in a modification of the first embodiment. [Figure 14] FIG. 13 is a diagram illustrating an example of a reception response from a replica radio device to a main radio device in the first embodiment and the modified example of the second embodiment. [Figure 15] 13A and 13B are diagrams illustrating an example of a reception response from a main radio to a terrestrial database in a modification of the first embodiment, and an example of a reception response from a terrestrial main radio to a terrestrial database in a modification of the second embodiment. [Figure 16] FIG. 11 is a block diagram of an on-board radio according to a second embodiment. [Figure 17] 13] FIG. 13 is a diagram showing an example of setting information held in a database management unit of an on-board radio device of the second embodiment. [Figure 18] FIG. 11 is a diagram showing an example of setting information held in a database management unit of a terrestrial radio device of the second embodiment. [Figure 19] FIG. 11 is a diagram showing an example of setting information held in a ground database in the second embodiment. [Figure 20] FIG. 11 is a diagram showing an example of the relationship between kilometer distance and radio field strength in the second embodiment. [Figure 21] FIG. 11 is a diagram showing an example of allocation of transmitting wireless sets for each kilometer range in the second embodiment. [Figure 22]10 is a flowchart showing the operation of the on-board radio device of the second embodiment. [Figure 23] 10 is a flowchart showing the operation of the terrestrial radio device of the second embodiment. [Figure 24] FIG. 11 is a diagram showing an example of how setting information is changed when an abnormality occurs in a terrestrial wireless device in the second embodiment. [Diagram 25] FIG. 11 is a diagram showing an example of how setting information is changed when an abnormality occurs in the on-board wireless device in the second embodiment. [Figure 26] FIG. 13 is a diagram showing an example of setting information distributed to a terrestrial radio device in a modified example of the second embodiment. [Figure 27] FIG. 13 is a diagram showing an example of a reception response from an on-board main radio to a ground database in the modified example of the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <Embodiment 1> 1 is a configuration diagram of a wireless communication system according to embodiment 1. This wireless communication system transmits and receives data between a train 1 and a ground facility 7, that is, transmits data.

[0010] A train 1 is equipped with a plurality of output devices, ie, an output device 2A and an output device 2B, and a plurality of radio devices, ie, an on-board radio device 3A and an on-board radio device 3B. In this embodiment, an example is shown in which the train 1 is equipped with two output devices and two on-board radio devices, but the number of the output devices and the on-board radio devices may be three or more.

[0011] The output device 2A is connected to the on-board radio 3A and the on-board radio 3B via a network, and the output device 2B is also connected to the on-board radio 3A and the on-board radio 3B via a network. Thus, the output device 2A and the output device 2B can input transmission data, which is data to be transmitted, to both the on-board radio 3A and the on-board radio 3B. The on-board radio 3A and the on-board radio 3B are also connected to each other via a network. There are no restrictions on the type of network of the train 1, and it may be, for example, Ethernet (registered trademark) or the like.

[0012] In this specification, data to be transmitted is referred to as "transmission data", however, for ease of explanation, transmission data sent from a radio device is sometimes referred to as "transmission data", and transmission data received by a radio device is sometimes referred to as "received data".

[0013] The ground facility 7 is equipped with a terrestrial radio 4A and a terrestrial radio 4B as a plurality of radio devices, a terrestrial device 5A and a terrestrial device 5B as a plurality of ground devices, and a terrestrial database 6 that holds setting information of each radio device (details will be described later). In this embodiment, an example is shown in which two terrestrial radio devices and two terrestrial devices are installed in the ground facility 7, but there may be three or more of them.

[0014] The ground equipment 5A is connected to the terrestrial radio 4A and the terrestrial radio 4B via a network, and the ground equipment 5B is also connected to the terrestrial radio 4A and the terrestrial radio 4B via a network. Therefore, the ground equipment 5A and the ground equipment 5B can input transmission data to both the terrestrial radio 4A and the terrestrial radio 4B. The terrestrial radio 4A and the terrestrial radio 4B are also connected to each other via a network. There are no restrictions on the type of network of the ground facility 7, and it may be, for example, Ethernet (registered trademark).

[0015] As shown in Fig. 1, the on-board radio 3A and the on-board radio 3B are connected to different radio lines, and the terrestrial radio 4A and the terrestrial radio 4B are connected to different radio lines. Here, the radio line to which the on-board radio 3A is connected is the same as the radio line to which the terrestrial radio 4A is connected, and the radio line to which the on-board radio 3B is connected is the same as the radio line to which the terrestrial radio 4B is connected. Therefore, the combination of the on-board radio 3A and the terrestrial radio 4A, and the combination of the on-board radio 3B and the terrestrial radio 4B are opposite devices of the same radio line. Transmission data is transmitted and received between the output device 2A and the output device 2B and the terrestrial device 5A and the terrestrial device 5B through the radio lines.

[0016] The ground database 6 is connected to the terrestrial radio 4A and the terrestrial radio 4B via a network, and holds setting information including information associating a type of transmission data (hereinafter referred to as "data type") with a radio line used for transmitting the transmission data, and information for managing the state of each radio. FIG. 2 shows a specific example of setting information held in the ground database 6. Setting information for the on-board radio is set for each train set, and setting information for the terrestrial radio is set for each train set that is the destination of the transmission data (destination train set). The setting information in the first embodiment includes information on transmitting radio allocation for each data type, which is information associating data types with radio lines, and information on the health check state of each radio, which is information on the state of each radio. Furthermore, the ground database 6 changes the transmitting radio allocation when an abnormality occurs in any of the radios, thereby changing the transmitting radio allocation.

[0017] A part of the setting information is also held in the on-board radio 3A, the on-board radio 3B, the terrestrial radio 4A and the terrestrial radio 4B, and the setting information is synchronized between the terrestrial database 6 and each radio. In other words, the setting information held in the terrestrial database 6 and the setting information held in each radio are kept in the same state.

[0018] 3 is a block diagram of the radio device 10 according to the embodiment 1. Each of the on-board radio device 3A, the on-board radio device 3B, the terrestrial radio device 4A, and the terrestrial radio device 4B shown in FIG.

[0019] The wireless device 10 includes a transmission data processing unit 11, a database management unit 12, a wireless transmission / reception unit 13, an antenna 14, an abnormality detection unit 15, and a reception data processing unit 16.

[0020] The transmission data processing unit 11 checks the data type of the transmission data (R1, R3) input from the connected output device or ground device, and determines whether or not the transmission data can be transmitted to the wireless line to which the wireless device 10 is connected based on the transmitting radio allocation (Figure 4 or Figure 5), which is the setting information held by the database management unit 12.Then, the transmission data (R5) that is determined to be transmittable is output to the wireless transceiver unit 13.

[0021] The wireless transmitting / receiving unit 13 performs signal processing required for wireless line transmission on the transmission data (R5) input from the transmission data processing unit 11, thereby generating a signal (R7) including the transmission data, and transmits it to the opposing wireless device via the antenna 14. The wireless transmitting / receiving unit 13 also performs reception signal processing on the signal (R7) received via the antenna 14 to extract reception data (R6), and outputs it to the reception data processing unit 16.

[0022] The received data processing unit 16 outputs the received data input from the wireless transceiver unit 13 to an output device or ground device connected to the wireless device 10 according to the destination address specified in the received data (R2, R4).

[0023] The abnormality detection unit 15 monitors the health check status of the wireless device 10, and if an abnormality occurs, notifies the database management unit 12 of the occurrence of the abnormality.

[0024] The database management unit 12 holds setting information, i.e., information on transmitting radio allocation for each data type and information on the health check status of each radio. When the radio 10 is an on-board radio, the database management unit 12 holds information on transmitting radio allocation for each data type for the formation to which the radio 10 belongs and information on the health check status of each radio, as shown in Fig. 4. When the radio 10 is an on-board radio, the database management unit 12 holds information on transmitting radio allocation for each data type set for each formation (destination formation) that is the destination of transmission data, and information on the health check status of each radio, as shown in Fig. 5.

[0025] Furthermore, when the radio set 10 is an on-board radio set, the database management unit 12 synchronizes the setting information between other on-board radio sets mounted on the same formation and the ground database 6. Furthermore, when the radio set 10 is a terrestrial radio set, the database management unit 12 synchronizes the setting information between other terrestrial radio sets installed in the ground facilities and the ground database 6.

[0026] The data processing operation of the radio device 10 according to the first embodiment will be described separately for a case where the radio device 10 is an on-board radio device and a case where the radio device 10 is a ground radio device.

[0027] First, the operation of the radio 10 as a ground radio will be described with reference to the flowchart in Fig. 6. Here, the explanation will be given assuming that the radio 10 is the on-board radio 3A, but the same operation is performed in the on-board radio 3B.

[0028] First, the database management unit 12 sets the transmission radio unit allocation for each data type shown in Fig. 4 in the transmission data processing unit 11 (step S1-1). The transmission data output from the output device 2A and the output device 2B are input to the transmission data processing unit 11 (step S1-2).

[0029] The transmission data processing unit 11 checks the data type of the input transmission data, and determines whether or not the transmission data can be transmitted (step S1-3) based on the transmission radio assignment for each data type held in the database management unit 12. The data type is specified by specific data indicating the data type included in the transmission data, or by a port number (port ID).

[0030] If the data type of the transmission data is a data type to which the radio 10 itself is assigned as the transmitting radio, the transmission data is determined to be transmittable, and if the data type is a data type to which another radio is assigned as the transmitting radio, the transmission data is determined to be non-transmittable. For example, if the radio 10 is the on-board radio 3A and the setting information shown in Fig. 4 is held in the database management unit 12, it is determined that the transmission is possible if the data type is AAAA or BBBB, and that the transmission is not possible if the data type is CCCC.

[0031] The transmission data processing unit 11 outputs the transmission data that is determined to be transmittable to the wireless transmission / reception unit 13 (step S1-4), and discards the transmission data that is determined to be untransmittable (step S1-5).

[0032] The database management unit 12 synchronizes the transmitting radio allocation for each data type and the health check status of each radio with the on-board radio 3B, which is another on-board radio, and the ground database 6. Any method of synchronization may be used. If the transmitting radio allocation for each data type has been changed as a result of the synchronization (Yes in step S1-6), the process returns to step S1-1, where the database management unit 12 resets the transmitting radio allocation for each data type in the transmission data processing unit 11. If the transmitting radio allocation for each data type has not been changed (No in step S1-6), the process returns to step S1-2.

[0033] Next, the operation of the radio 10 as a terrestrial radio will be described with reference to the flowchart in Fig. 7. Here, the description will be given assuming that the radio 10 is the terrestrial radio 4A, but the same process is also performed in the terrestrial radio 4B.

[0034] First, the database management unit 12 sets the transmission radio unit allocation for each data type set for each destination composition shown in Fig. 5 in the transmission data processing unit 11 (step S2-1). The transmission data output from the ground equipment 5A and the ground equipment 5B are input to the transmission data processing unit 11 (step S2-2).

[0035] The transmission data processing unit 11 checks the destination composition of the transmission data from the destination of the input transmission data (step S2-3). Furthermore, the transmission data processing unit 11 checks the data type of the transmission data, and determines whether or not the transmission data can be transmitted based on the transmission radio assignment for each data type set for each destination composition held in the database management unit 12 (step S2-4). The data type is specified by specific data indicating the data type included in the transmission data, or by a port number (port ID).

[0036] If the destination train set and data type of the transmission data are those to which the radio 10 is assigned as the transmitting radio, the transmission data is determined to be transmittable, and if the destination train set and data type are those to which another radio is assigned as the transmitting radio, the transmission data is determined to be untransmittable. When the database management unit 12 holds the setting information shown in Fig. 5, if the data type is AAAA or BBBB, it is determined to be transmittable, and if the data type is CCCC, it is determined to be untransmittable.

[0037] The transmission data processing unit 11 outputs the transmission data that is determined to be transmittable to the wireless transmission / reception unit 13 (step S2-5), and discards the transmission data that is determined to be untransmittable (step S2-6).

[0038] The database management unit 12 synchronizes the transmitting radio unit allocation for each data type set for each destination train set and the health check status of each radio unit with the ground equipment 5B, which is another ground equipment, and the ground database 6. Any method of synchronization may be used. If, as a result of the synchronization, there is a change in the transmitting radio unit allocation for each data type defined for each destination train set (Yes in step S2-7), the process returns to step S2-1, and the database management unit 12 resets the transmitting radio unit allocation for each data type defined for each destination train set in the transmission data processing unit 11 based on the updated information. If there is no change in the transmitting radio unit allocation for each data type (No in step S2-7), the process returns to step S2-2.

[0039] As shown in FIG. 2, the ground database 6 holds setting information indicating the allocation of transmitting radio units for each data type and the health check status of each radio unit, for the on-board radio units mounted on each train set and the ground radio units installed in the ground equipment 7, and the allocation of transmitting radio units for each data type is updated by the ground database 6.

[0040] Next, the process of changing the transmitting radio unit allocation performed by the ground database 6 when an abnormality occurs in any of the radio units 10 (on-board radio unit or ground radio unit) will be described with reference to the flowchart of FIG.

[0041] When the abnormality detection unit 15 of the wireless device 10 detects an abnormality in the wireless device 10, it notifies the database management unit 12 of the wireless device 10 of the occurrence of the abnormality. The database management unit 12 updates the setting information so as to change the health check status of its own wireless device 10 from normal to abnormal. When the setting information is updated in the database management unit 12, the setting information held in the terrestrial database 6 is updated in synchronization therewith.

[0042] When the ground database 6 detects that an abnormality has occurred in any of the radio devices 10 (step S3-1), it checks whether the radio device 10 in which the abnormality has occurred is an on-board radio device or a ground radio device (step S3-2).

[0043] If the radio 10 in which the abnormality has occurred is a ground radio, the abnormality affects the entire train set. In this case, the ground database 6 updates the setting information related to the ground radio and the on-board radios of all train sets, and changes the transmission radio allocation that was assigned to the radio in which the abnormality has occurred to a normal radio (step S3-3).

[0044] 9 shows an example of changes to the setting information stored in the terrestrial database 6 and the database management unit 12 of each radio when a train has formations X and Y and an abnormality occurs in terrestrial radio A. When an abnormality occurs in terrestrial radio A, the radio line of terrestrial radio A becomes unusable, so the transmitting radios of all data types are assigned to terrestrial radio B.

[0045] If the radio 10 in which the abnormality has occurred is an on-board radio, the scope of the abnormality is limited to the train set to which the radio 10 in which the abnormality has occurred belongs. In this case, the ground database 6 updates the setting information related to the on-board radio of the train set in which the abnormality has occurred, and changes the transmitting radio allocation that was assigned to the radio in which the abnormality has occurred to a normal radio (step S3-4).

[0046] 10 shows an example of changes to the setting information held in the ground database 6 and the database management units 12 of each radio when a train has two configurations, X and Y, and an abnormality occurs in on-board radio A of configuration X. When an abnormality occurs in on-board radio A, the transmitting radio allocation for communications corresponding to configuration X is changed to on-board radio B and ground radio B. Since configuration Y is not affected by the abnormality, the transmitting radio allocation for communications corresponding to configuration Y is not changed. The changes to the transmitting radio allocation made by the ground database 6 are reflected in the setting information held in the database management units 12 of all radios 10 by synchronization processing.

[0047] As described above, according to the wireless communication system of the first embodiment, all transmission data is input to each of the multiple wireless devices, and each wireless device judges whether or not it can transmit the transmission data based on the transmission wireless device allocation for each data type, and discards the transmission data that is judged to be untransmittable. Therefore, the wireless devices themselves select the wireless line, and a transmission control device that allocates the transmission path is not required. Another advantage is that the setting information of the on-board wireless devices and the ground wireless devices can be managed collectively in the ground database.

[0048] [Variations] In the first embodiment, a configuration has been shown in which the setting information indicating the allocation of transmitting radio units for each data type and the health check status of each radio unit is synchronized between the ground database 6 and the database management unit 12 of each radio unit 10, but the method of synchronizing the setting information is not limited to this. For example, one of the multiple radio units mounted on the train 1 may be an on-board main radio unit and the others may be on-board replica radio units, one of the multiple radio units installed in the ground equipment 7 may be a ground main radio unit and the others may be ground replica radio units, the ground database 6 may distribute setting information to the on-board main radio unit and the ground main radio unit, the setting information may be distributed from the on-board main radio unit to the on-board replica radio unit, and the setting information may be distributed from the ground main radio unit to the ground replica radio unit.

[0049] 11 is a configuration diagram of a wireless communication system according to this modification. A train 21 is equipped with an output device 22A and an output device 22B as a plurality of output devices, and an on-board main wireless device 23A and an on-board replica wireless device 23B as a plurality of wireless devices.

[0050] The output device 22A is connected to the on-board main radio 23A and the on-board replica radio 23B via a network, and the output device 22B is also connected to the on-board main radio 23A and the on-board replica radio 23B via a network. Therefore, the output device 22A and the output device 22B can input transmission data, which is data to be transmitted, to both the on-board main radio 23A and the on-board replica radio 23B. In addition, the on-board main radio 23A and the on-board replica radio 23B are also connected to each other via a network.

[0051] The ground equipment 27 is equipped with a ground main radio 24A and a ground replica radio 24B as multiple radio devices, a ground device 25A and a ground device 25B as multiple ground devices, and a ground database 26 which is a database in which setting information described later is held.

[0052] The terrestrial database 26 distributes a transmitting radio allocation for each data type to the on-board main radio 23A and the terrestrial main radio 24A, and the on-board main radio 23A and the terrestrial main radio 24A distribute it to the on-board replica radio 23B and the terrestrial replica radio 24B. In this method, the terrestrial database 26 distributes a transmitting radio allocation for each data type as shown in Fig. 12 to the on-board main radio 23A, which then transfers it to the on-board replica radio 23B. In addition, the terrestrial database 26 distributes a transmitting radio allocation for each data type set for each destination formation as shown in Fig. 13 to the terrestrial main radio 24A, which then transfers it to the terrestrial replica radio 24B.

[0053] Furthermore, the ground database 26 can check the normality of each radio device based on the response to the distributed setting information. The on-board replica radio device 23B and the ground replica radio device 24B return the response shown in Fig. 14 to the on-board main radio device 23A and the ground main radio device 24A, respectively, as a response to receiving the transmitting radio device allocation for each data type. Furthermore, the on-board main radio device 23A and the ground main radio device 24A return the response shown in Fig. 15, in which their own status is added to the response (Fig. 14) received from the on-board replica radio device 23B and the ground replica radio device 24B, as a response to receiving the transmitting radio device allocation for each data type to the ground database 26. This allows the ground database 26 to grasp the status of all radio devices.

[0054] When the terrestrial database 26 detects a radio abnormality, the operation is the same as that described above, but in addition, if an abnormality occurs in the main radio, the above operation is continued by switching a normal replica radio to the main radio, and switching the main radio where the abnormality occurred to the replica radio.

[0055] <Embodiment 2> In the first embodiment, a method for allocating a transmitting radio for each data type has been described, but in the second embodiment, a method for switching the transmitting radio depending on the current position of the train will be described.

[0056] The configuration of the wireless communication system according to the second embodiment is as shown in FIG. 1, similar to the first embodiment.

[0057] 16 is a block diagram showing a configuration of a radio set 30 serving as an on-board radio set in embodiment 2. Each of the on-board radio sets 3A and 3B in embodiment 2 is configured by the radio set 30 in FIG.

[0058] The wireless device 30 includes a transmission data processing unit 31, a database management unit 32, a wireless transceiver unit 33, an antenna 34, an abnormality detection unit 35, a reception data processing unit 36, and a position detection unit 37. The transmission data processing unit 31, the database management unit 32, the wireless transceiver unit 33, the antenna 34, the abnormality detection unit 35, and the reception data processing unit 36 ​​correspond to the transmission data processing unit 11, the database management unit 12, the wireless transceiver unit 13, the antenna 14, the abnormality detection unit 15, and the reception data processing unit 16 of the wireless device 10 shown in Fig. 3. In other words, the configuration of the wireless device 30 in Fig. 16 corresponds to the configuration of the wireless device 10 in Fig. 3 with the position detection unit 37 added.

[0059] The position detection unit 37 notifies the database management unit 32 of the current position of the train set in which the radio set 30 is installed. Here, the current position of the train set is expressed in "kilometers." The method of obtaining the kilometerage information may be any method, such as calculation from the current position measured using a GPS (Global Positioning System), positioning using UWB (Ultra Wide Band) communication, or obtaining information from other on-board equipment.

[0060] The database management unit 32 also manages the allocation of transmitting radio units for each kilometer range, the health check status of each radio unit, and the current location as setting information, as shown in Fig. 17. The database management unit 32 also sets the allocation of transmitting radio units for each kilometer range for the transmission data processing unit 31, notifies the transmission data processing unit 31 of the kilometer range, and synchronizes the setting information with the ground database 6 and other radio units mounted on the same train formation.

[0061] The transmission data processing unit 31 determines whether or not the transmission data (R31, R33) input from the connected output device can be transmitted to the wireless line to which the wireless device 30 is connected, based on the transmitting wireless device allocation for each kilometer range (Figure 17), which is the setting information held by the database management unit 32, and outputs the transmission data (R35) that is determined to be transmittable to the wireless transmission / reception unit 33.

[0062] The wireless transmitting / receiving unit 33 performs signal processing required for wireless line transmission on the transmission data (R35) input from the transmission data processing unit 31, thereby generating a signal (R37) including the transmission data, and transmits it to the opposing wireless device via the antenna 34. The wireless transmitting / receiving unit 33 also performs reception signal processing on the signal (R37) received via the antenna 34 to extract reception data (R36), and outputs it to the reception data processing unit 36.

[0063] The received data processing unit 36 ​​outputs the received data input from the wireless transmitting / receiving unit 33 to an output device connected to the wireless device 30 in accordance with the destination address specified in the received data (R32, R34).

[0064] The configurations of the terrestrial radio 4A and the terrestrial radio 4B in the second embodiment are the same as the radio 10 shown in Fig. 3 in the first embodiment. However, in the terrestrial radio of the second embodiment, the database management unit 12 holds, as setting information, the allocation of transmitting radio units for each kilometer range set for each train-organization destination, the current position of the train-organization, and the health check status of each radio unit, as shown in Fig. 18, and synchronizes the setting information with the terrestrial database 6 and other radio units in the ground facility 7.

[0065] The ground database 6 also holds setting information including the allocation of transmitting radio units for each kilometer range set for each train set, the current position of each train set, and the health check status of each radio unit, as shown in Fig. 19. Furthermore, the ground database 6 changes the allocation of transmitting radio units for each kilometer range when an abnormality occurs in any of the radio units.

[0066] Here, in the wireless communication system according to the second embodiment, the relationship between the mileage and the field strength of each wireless device as shown in FIG. 20 is measured in advance for the route on which the train runs. From the measurement results, it is determined which wireless device is to be used for each mileage range, and a transmitting wireless device allocation for each mileage range is created. In this embodiment, as in the example of FIG. 20, it is assumed that the field strength of wireless device A is higher than that of wireless device B in the mileage range of 0 to 13.5 km, the field strength of wireless device B is higher than that of wireless device A in the mileage range of 13.5 to 25.0 km, and the field strength of wireless device A is higher than that of wireless device B in the mileage range of 25.0 to 38.0 km. In this case, the transmitting wireless device allocation as shown in FIG. 21 is determined, and the wireless device with the higher field strength is selected as the transmitting wireless device according to the current position of the train, and stable communication can be performed. Note that in this embodiment, the field strength data is used as an index for selecting the transmitting wireless device, but other data such as communication throughput and packet loss rate may be used as the index. In addition, by collecting index data using radio equipment while trains are running each day and regularly updating the allocation of transmitting radio equipment, it is possible to always communicate under good communication conditions.

[0067] The operation of the radio device 30 according to the second embodiment will be described with reference to the flowchart in Fig. 22. Here, the explanation will be given assuming that the radio device 30 is the on-board radio device 3A, but the same operation is performed in the on-board radio device 3B.

[0068] First, the database management unit 32 sets the transmission radio unit allocation for each kilometer range shown in Fig. 17 in the transmission data processing unit 31 (step S4-1). The transmission data output from the output device 2A and the output device 2B are input to the transmission data processing unit 31 (step S4-2).

[0069] The transmission data processing unit 31 checks the kilometre distance of the current location of the train formation notified by the position detection unit 37, and determines whether or not to transmit the transmission data based on the transmitting radio allocation for each kilometre range held in the database management unit 32 (step S4-3).

[0070] If the kilometer distance of the current location of the formation equipped with the radio 30 is within the range to which the radio 30 itself is assigned as a transmitting radio, the transmission data is judged to be transmittable, and if it is within the range to which another radio is assigned as a transmitting radio, the transmission data is judged to be non-transmittable. For example, if the radio 30 is the on-board radio 3A and the setting information exemplified in Fig. 17 is held in the database management unit 32, it is judged that transmission is possible if the kilometer distance of the current location is within the range of 0 to 13.5 km or within the range of 25.0 to 38.0 km, and that transmission is not possible if the kilometer distance of the current location is within the range of 13.5 to 25.0 km.

[0071] The transmission data processing unit 31 outputs the transmission data that is determined to be transmittable to the wireless transmission / reception unit 33 (step S4-4), and discards the transmission data that is determined to be untransmittable (step S4-5).

[0072] The database management unit 32 synchronizes the transmitting radio allocation for each kilometer range, the current position, and the health check status of each radio with the other on-board radio, the on-board radio 3B, and the ground database 6. Any method of synchronization may be used. If the transmitting radio allocation for each kilometer range has changed as a result of the synchronization (Yes in step S4-6), the database management unit 32 resets the transmitting radio allocation for each kilometer range in the transmission data processing unit 11. If there has been no change in the transmitting radio allocation for each kilometer range (No in step S4-6), the process returns to step S4-2.

[0073] Next, the operation of the radio device 10 (FIG. 3) as a terrestrial radio device in the second embodiment will be described with reference to the flowchart in FIG. 23. Here, the description will be given assuming that the radio device 10 is the terrestrial radio device 4A, but the same processing is performed in the terrestrial radio device 4B.

[0074] First, the database management unit 12 sets the transmission radio unit allocation for each kilometer range set for each destination train set shown in Fig. 18 in the transmission data processing unit 11 (step S5-1). The transmission data output from the ground equipment 5A and the ground equipment 5B are input to the transmission data processing unit 11 (step S5-2).

[0075] The transmission data processing unit 11 checks the destination train set of the transmission data from the input destination of the transmission data (step S5-3). Furthermore, the transmission data processing unit 11 checks the kilometre of the current location of the destination train set of the transmission data, and judges whether the transmission data can be transmitted based on the transmission radio allocation for each kilometre range set for each destination train set held in the database management unit 12 (step S5-4). If the destination train set of the transmission data and the kilometre of its current location are within the destination train set and kilometre range to which the radio set 10 is assigned as the transmitting radio, the transmission data is judged to be transmittable, and if they are within the destination train set and kilometre range to which another radio set is assigned as the transmitting radio, the transmission data is judged to be non-transmittable.

[0076] The transmission data processing unit 11 outputs the transmission data that is determined to be transmittable to the wireless transmission / reception unit 13 (step S5-5), and discards the transmission data that is determined to be untransmittable (step S5-6).

[0077] The database management unit 12 synchronizes the transmitting radio allocation for each kilometer range set for each destination train set, the kilometer range of the current position of each train set, and the health check status of each radio with the ground equipment 5B, which is another ground equipment, and the ground database 6. Any method of synchronization may be used. If, as a result of the synchronization, there is a change in the transmitting radio allocation for each kilometer range set for each destination train set (Yes in step S5-7), the process returns to step S5-1, and the database management unit 12 resets the transmitting radio allocation for each kilometer range set for each destination train set in the transmission data processing unit 11 based on the updated information. If there is no change in the transmitting radio allocation for each kilometer range (No in step S5-7), the process returns to step S5-2.

[0078] As shown in FIG. 19, the ground database 6 holds configuration information indicating the allocation of transmitting radio units by kilometer range for the on-board radio units mounted on each train and the ground radio units installed in the ground equipment 7, the kilometer range of the current location of each train, and the health check status of each radio unit, and the updating of the allocation of transmitting radio units by kilometer range is performed by the ground database 6.

[0079] Next, the process of changing the transmitting radio unit allocation performed by the ground database 6 when an abnormality occurs in either the radio unit 10 (terrestrial radio unit) or the radio unit 30 (on-board radio unit) will be described using the flowchart in Fig. 8, as in the first embodiment. Hereinafter, the radio unit 10 or the radio unit 30 will be referred to as "radio unit 10, 30".

[0080] When the abnormality detection unit 15 or the abnormality detection unit 35 (hereinafter referred to as "abnormality detection unit 15, 35") of the wireless device 10, 30 detects an abnormality in the wireless device 10, 30, it notifies the database management unit 12 or 32 of the wireless device 10, 30 of the occurrence of the abnormality. The database management unit 12 or the database management unit 32 (hereinafter referred to as "database management unit 12, 32") updates the setting information so as to change the health check status of its own wireless device 10, 30 from normal to abnormal. When the setting information is updated in the database management unit 12, 32, the setting information held in the terrestrial database 6 is updated in synchronization therewith.

[0081] When the ground database 6 detects that an abnormality has occurred in either of the radios 10, 30 (step S3-1), it checks whether the radio 10, 30 in which the abnormality has occurred is an on-board radio or a ground radio (step S3-2).

[0082] If the radio 10, 30 in which the abnormality has occurred is a ground radio, the abnormality affects the entire train set and the range of about kilometers. In this case, the ground database 6 updates the setting information related to the ground radio and the on-board radios of all train sets, and changes the transmission radio allocation that was assigned to the radio in which the abnormality has occurred to a normal radio (step S3-3).

[0083] 24 shows an example of changes to the setting information stored in the terrestrial database 6 and the database management units 12, 32 of each radio when a train has formations X and Y and an abnormality occurs in terrestrial radio A. When an abnormality occurs in terrestrial radio A, the radio line of terrestrial radio A becomes unusable, so all transmitting radios within a kilometer range are assigned to terrestrial radio B.

[0084] If the radio 10, 30 in which the abnormality has occurred is an on-board radio, the scope of the abnormality is limited to the train set to which the radio 10, 30 in which the abnormality has occurred belongs. In this case, the ground database 6 updates the setting information related to the on-board radio of the train set in which the abnormality has occurred, and changes the transmission radio allocation that was assigned to the radio in which the abnormality has occurred to a normal radio (step S3-4).

[0085] 25 shows an example of changes to the setting information held in the ground database 6 and the database management units 12, 32 of each radio when a train has two configurations, X and Y, and an abnormality occurs in on-board radio A of configuration X. When an abnormality occurs in on-board radio A, the transmitting radio allocation for communications corresponding to configuration X is changed to on-board radio B and ground radio B. Since configuration Y is not affected by the abnormality, the transmitting radio allocation for communications corresponding to configuration Y is not changed. The changes to the transmitting radio allocation made by the ground database 6 are reflected in the setting information held in the database management units 12, 32 of all radios 10, 30 by synchronization processing.

[0086] As described above, according to the wireless communication system of the second embodiment, all transmission data is input to each of the multiple wireless devices, and each wireless device judges whether or not it can transmit the transmission data based on the transmission wireless device allocation for each kilometer range, and discards the transmission data that is judged to be unsendable. Therefore, the wireless devices themselves select the wireless line, and a transmission control device that allocates the transmission path is not required. Another advantage is that the setting information of the on-board wireless devices and the ground wireless devices can be managed collectively in the ground database.

[0087] [Variations] In the second embodiment, the configuration has been shown in which the setting information indicating the allocation of transmitting radio units for each kilometer range, the kilometer distance of the current position of each formation, and the health check status of each radio unit is synchronized between the ground database 6 and the database management units 12, 32 of each radio unit 10, 30, but the method of synchronizing the setting information is not limited to this. For example, one of the multiple radio units mounted on the train 1 may be an on-board main radio unit and the others may be on-board replica radio units, one of the multiple radio units installed in the ground equipment 7 may be a ground main radio unit and the others may be ground replica radio units, the ground database 6 may distribute setting information to the on-board main radio unit and the ground main radio unit, the setting information may be distributed from the on-board main radio unit to the on-board replica radio unit, and the setting information may be distributed from the ground main radio unit to the ground replica radio unit.

[0088] The configuration of the wireless communication system according to this modification is the same as that of Fig. 11. A train 21 is equipped with an output device 22A and an output device 22B as a plurality of output devices, and an on-board main wireless device 23A and an on-board replica wireless device 23B as a plurality of wireless devices. In addition, the ground equipment 27 is equipped with a ground main wireless device 24A and a ground replica wireless device 24B as a plurality of wireless devices, a ground device 25A and a ground device 25B as a plurality of ground devices, and a ground database 26 that is a database in which setting information is stored.

[0089] The terrestrial database 26 distributes transmitting radio allocation for each kilometer range to the on-board main radio 23A and the terrestrial main radio 24A, and the on-board main radio 23A and the terrestrial main radio 24A distribute the same to the on-board replica radio 23B and the terrestrial replica radio 24B. In this method, the terrestrial database 26 distributes transmitting radio allocation for each kilometer range as shown in Fig. 21 to the on-board main radio 23A, which then transfers it to the on-board replica radio 23B. In addition, the terrestrial database 26 distributes transmitting radio allocation for each kilometer range set for each destination formation and the kilometer range of the current position of each formation as shown in Fig. 26 to the terrestrial main radio 24A, which then transfers it to the terrestrial replica radio 24B.

[0090] The ground database 26 can check the normality of each radio device by the response to the distributed setting information. The on-board replica radio device 23B and the ground replica radio device 24B return the response shown in FIG. 14 to the on-board main radio device 23A and the ground main radio device 24A, respectively, as a response to receiving the transmission radio device allocation for each kilometer range. The on-board main radio device 23A returns a response shown in FIG. 27 in which its own status and the kilometer distance of the current position of its own formation are added to the response received from the on-board replica radio device 23B (FIG. 14) as a response to receiving the transmission radio device allocation to the ground database 26. The ground main radio device 24A returns a response shown in FIG. 15 in which its own status is added to the response received from the ground replica radio device 24B (FIG. 14) as a response to receiving the transmission radio device allocation to the ground database 26. This allows the ground database 26 to grasp the status of all radio devices.

[0091] When the terrestrial database 26 detects a radio abnormality, the operation is the same as that described above, but in addition, if an abnormality occurs in the main radio, the above operation is continued by switching a normal replica radio to the main radio, and switching the main radio where the abnormality occurred to the replica radio.

[0092] It should be noted that the embodiments can be freely combined, and each embodiment can be modified or omitted as appropriate.

[0093] <Additional Notes> Various aspects of the present disclosure are summarized below as appendices.

[0094] (Appendix 1) A wireless communication system that performs wireless communication using a plurality of wireless lines, A plurality of wireless devices each connected to a different one of the wireless circuits and transmitting transmission data using the wireless circuit to which the wireless devices are connected; a plurality of output devices that output the transmission data to a plurality of the wireless devices; Equipped with the wireless device determines whether each of the transmission data input from the plurality of output devices is transmittable to the wireless line to which the wireless device is connected, outputs the transmission data that is determined to be transmittable to the wireless line, and does not output the transmission data that is determined to be untransmittable to the wireless line. Wireless communication system.

[0095] (Appendix 2) The radio device includes: a database management unit that stores setting information that associates a data type of the transmission data with the wireless line used for transmitting the transmission data; determining whether or not to transmit the transmission data to the wireless line to which the device itself is connected based on the data type of the transmission data and the setting information; 2. The wireless communication system of claim 1.

[0096] (Appendix 3) The data type of the transmission data is defined by specific data included in the transmission data or a port ID of the transmission data. 3. A wireless communication system as claimed in claim 2.

[0097] (Appendix 4) The radio device includes: a database management unit that stores setting information that associates a current location of the wireless device with the wireless line used for transmitting the transmission data; determining whether or not to transmit the transmission data to the wireless line to which the wireless device is connected, based on the current location of the wireless device and the setting information; 2. The wireless communication system of claim 1.

[0098] (Appendix 5) The setting information held by the database management unit is synchronized among the plurality of wireless devices. 5. A wireless communication system according to any one of claims 2 to 4.

[0099] (Appendix 6) The plurality of radio devices are composed of a main radio device and a replica radio device, the main wireless device outputs the setting information held in the database management unit of the main wireless device to the replica wireless device; the replica radio device updates the setting information held in its own database management unit based on the setting information input from the main radio device. 5. A wireless communication system according to any one of claims 2 to 4.

[0100] (Appendix 7) When an abnormality occurs in any one of the plurality of wireless devices, the setting information is updated so that the transmission data transmitted by the wireless device in which the abnormality occurs is transmitted by another wireless device in which no abnormality occurs. 7. A wireless communication system according to any one of claims 2 to 6.

[0101] (Appendix 8) A wireless device that transmits transmission data using a specific wireless line to which the wireless device is connected, determining whether each of the transmission data input from a plurality of output devices is transmittable to the wireless line, outputting the transmission data that is determined to be transmittable to the wireless line, and not outputting the transmission data that is determined to be untransmittable to the wireless line; Radio. [Explanation of symbols]

[0102] 1 train, 2A, 2B output device, 3A, 3B on-board radio, 4A, 4B ground radio, 5A, 5B ground equipment, 6 ground database, 7 ground equipment, 10 radio, 11 transmission data processing unit, 12 database management unit, 13 radio transmitting / receiving unit, 14 antenna, 15 abnormality detection unit, 16 reception data processing unit, 21 train, 22A, 22B output device, 23A on-board main radio, 23B on-board replica radio, 24A ground main radio, 24B ground replica radio, 25A, 25B ground equipment, 26 ground database, 27 ground equipment, 30 radio, 31 transmission data processing unit, 32 database management unit, 33 radio transmitting / receiving unit, 34 antenna, 35 abnormality detection unit, 36 reception data processing unit, 37 position detection unit.

Claims

1. A wireless communication system that performs wireless communication using a plurality of wireless lines, a plurality of radio devices each connected to a different one of the radio lines and transmitting transmission data using the radio line to which each radio device is connected; a plurality of output devices that output the transmission data to a plurality of the radio devices; Equipped with the wireless device determines whether or not each of the transmission data input from the plurality of output devices is transmittable to the wireless line to which the wireless device is connected, and outputs the transmission data that is determined to be transmittable to the wireless line, and does not output the transmission data that is determined to be untransmittable to the wireless line; Wireless communication system.

2. The radio a database management unit that stores setting information that associates the data type of the transmission data or the current location of the wireless device with the wireless line used for transmitting the transmission data; determining whether or not to transmit the transmission data to the wireless line to which the wireless device is connected based on the data type of the transmission data or the current location of the wireless device and the setting information; 10. The wireless communication system of claim 1.

3. The setting information held by the database management unit is synchronized among the plurality of wireless devices.

3. The wireless communication system according to claim 2.

4. the plurality of radio devices are configured of a main radio device and replica radio devices, the main radio outputs the setting information held in the database management unit of the main radio to the replica radio; the replica radio device updates the setting information held in its own database management unit based on the setting information input from the main radio device; 3. The wireless communication system according to claim 2.

5. When an abnormality occurs in any of the plurality of radio devices, the setting information is updated so that the transmission data that was being transmitted by the radio device in which the abnormality occurred is transmitted by another radio device in which no abnormality occurs.

3. The wireless communication system according to claim 2.

6. A radio device that transmits transmission data using a specific radio line to which it is connected, determining whether or not each of the transmission data input from a plurality of output devices is transmittable to the wireless line, and outputting the transmission data that is determined to be transmittable to the wireless line, and not outputting the transmission data that is determined to be transmittable to the wireless line; Radio.

7. A database management unit that stores setting information that associates the data type of the transmission data or the current location of the radio device with the radio line used to transmit the transmission data, determining whether or not to transmit the transmission data to the wireless line to which the wireless device is connected based on the data type of the transmission data or the current location of the wireless device and the setting information; 7. The radio according to claim 6.

8. The data type of the transmission data is specified by specific data included in the transmission data or a port ID of the transmission data.

8. The radio according to claim 7.

9. The setting information held by the database management unit is synchronized with other wireless devices.

9. The radio according to claim 7 or 8.

10. A wireless device outputs the setting information stored in its own database management unit to another wireless device.

9. The radio according to claim 7 or 8.

11. Updating the setting information held by the database management unit of the wireless device itself based on the setting information input from another wireless device.

9. The radio according to claim 7 or 8.

12. When an abnormality occurs in the radio device, the setting information is updated so that the transmission data that was being transmitted by the radio device in which the abnormality occurred is transmitted by another radio device in which no abnormality has occurred.

9. The radio according to claim 7 or 8.

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