Heavy-load group train wireless communication method, system and device and storage medium

Abstract

The invention relates to / belongs to the technical field of rail transit, and particularly relates to a heavy-load group train wireless communication method, system and device and a storage medium. The invention aims to solve the technical problems of high error rate and high packet loss rate caused by interference of wireless signals of a train in an air interface transmission process in the prior art. Comprising the following steps of: constructing a straight-through link of two adjacent trains by utilizing a vehicle-mounted radio station of each train in the heavy-load group trains, and constructing a relay link between the vehicle-mounted radio station and a relay radio station; each train establishes a service layer communication link between the train automatic protection system of the train and the train automatic protection system of the adjacent train based on the established network layer communication link; wherein the network layer communication link comprises a straight-through link and a relay link; and after the service layer communication link is established, each train sends communication data messages to the front train and the rear train at regular time according to a preset time period by using a vehicle-mounted radio station.

Description

Technical Field

[0001] The present invention belongs to the field of rail transit technology, and in particular relates to a wireless communication method, system, device and storage medium for heavy-load group trains. Background Art

[0002] In the field of rail transit, when the thrust of a single locomotive reaches a bottleneck, the method of synchronously controlling multiple locomotives is usually used to increase the single-trip carrying capacity of heavy-load freight trains. In recent years, both domestic and foreign countries have begun to study the virtual coupling or self-organizing network of heavy-load freight trains to form heavy-load train formations, thereby increasing the railway carrying capacity of heavy-load freight.

[0003] In the existing technology, heavy-load freight trains use self-organizing networks to achieve direct communication between trains, mainly using point-to-point and point-to-multipoint transmission mechanisms, and using wireless air interface 400MHz-470MHz frequency band resources to achieve train-to-train data transmission. The trains are synchronized with each other and train tracking is completed, so that the running distance between multiple trains in the formation is kept within the minimum safe distance, thereby improving transportation efficiency.

[0004] The prior art has the following technical problems:

[0005] Due to the presence of obstructions such as buildings, trees, mountains, and tunnels on both sides of the track, the wireless signals will be interfered with during air interface transmission, resulting in high bit error rate and high packet loss rate, and the wireless communication link established between the two trains at the business level will be interrupted. Summary of the invention

[0006] The present invention provides a wireless communication method, system, device and storage medium for heavy-load group trains, aiming to solve the technical problem in the above-mentioned prior art that the presence of buildings, trees, mountains, tunnels and other obstructions on both sides of the track will interfere with the wireless signal during air interface transmission, causing high bit error rate and high packet loss rate, resulting in the interruption of the wireless communication link at the business level established between the two trains.

[0007] The technical solution of the present invention to solve the above technical problem is as follows: A wireless communication method for a heavy-load group train, comprising:

[0008] Using the onboard radio of each train in the heavy-load group train to construct a direct link between two adjacent trains, and construct a relay link between the onboard radio and the relay radio;

[0009] Each train establishes a service layer communication link between its own automatic train protection system and the automatic train protection system of an adjacent train based on the established network layer communication link; wherein the network layer communication link includes a direct link and a relay link;

[0010] After the business layer communication link is established, each train uses the on-board radio to send communication data messages to the preceding and following trains according to a preset time period.

[0011] Furthermore, the above also includes:

[0012] Configure a unique network address for each train in the heavy-load group train and set the port number according to the communication direction;

[0013] When the on-board radio of a train receives a communication data message sent by an adjacent train, it parses the communication data message and obtains the network address and port number, and determines whether the received communication data message belongs to the preceding train or the succeeding train based on the obtained network address and port number.

[0014] Furthermore, when the onboard radio station of the train sends the communication data message, the link status of the network layer communication link is determined to obtain a link status result, and a direct link or a relay link is selected based on the link status result to send the communication data message.

[0015] Further, the above-mentioned determining the link status of the network layer communication link specifically includes:

[0016] Determine whether the communication data message sent by the adjacent train and the link status message sent by the relay station are received:

[0017] If the communication data message and the link status message are not received, a link status result indicating that the link is not activated is obtained;

[0018] If the communication data message with correct CRC is received in the first continuous time window, a normal link status result of the through link is obtained; if the communication data message is not received in the second continuous time window under the normal state of the through link, a link status result of the through link loss is obtained;

[0019] If the link status message with correct CRC is received within the first continuous time window, a link status result indicating that the relay link is normal is obtained; if the link status message is not received within the second continuous time window while the relay link is normal, a link status result indicating that the relay link is lost is obtained;

[0020] If the communication data message and the link status message with correct CRC are received within the first continuous time window, the link status result of the direct / relay link being normal is obtained; if the communication data message and the link status message are not received within the second continuous time window while the direct / relay link is in a normal state, the link status result of the direct link being lost and the relay link being lost is obtained.

[0021] Furthermore, the wireless signal coverage area of ​​the relay station is set according to the maximum tracking distance between two adjacent trains in the heavy-load group train and the distance between the two adjacent trains.

[0022] Further, the above includes:

[0023] Utilizing the vehicle-mounted radio station to cache the received communication data message into a time window filter; wherein the time window filter is used to cache the communication data message for a preset time threshold;

[0024] Determine whether the communication data message newly entering the time window filter is consistent with the communication data message cached in the time window filter; if they are consistent, discard the newly entered communication data message; if they are inconsistent, retain the newly entered communication data message;

[0025] The communication data message output by the time window filter is forwarded to the train automatic protection system.

[0026] Furthermore, the above also includes:

[0027] Performing time synchronization on each train in the heavy-load group train;

[0028] Dividing the time period slice into a plurality of time transmission channels;

[0029] A time transmission channel is allocated to each train, so that each train transmits data according to the time transmission channel allocated to itself.

[0030] In a second aspect, in order to solve the above technical problems, the present invention further provides a heavy-load group train wireless communication system, comprising:

[0031] A network layer module, used to construct a direct link between two adjacent trains using the onboard radio of each train in the heavy-load group train, and to construct a relay link between the onboard radio and the relay radio;

[0032] A business layer module, used for each train to establish a business layer communication link between its own automatic train protection system and the automatic train protection system of an adjacent train based on the established network layer communication link; wherein the network layer communication link includes a direct link and a relay link;

[0033] The data transmission module is used for each train to use the on-board radio to send communication data messages to the preceding and following trains according to a preset time period after the business layer communication link is established.

[0034] In the third aspect, in order to solve the above-mentioned technical problems, the present invention also provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the wireless communication method for heavy-load group trains of the present application is implemented.

[0035] In a fourth aspect, in order to solve the above-mentioned technical problem, the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the wireless communication method for heavy-load group trains of the present application is implemented.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] 1. The present invention optimizes the point-to-point direct link maintenance mechanism, and ensures that the 400M vehicle-mounted radio can correctly perceive the health status of the direct link by establishing link establishment, link loss and reconstruction related mechanisms, and avoids sending data in an abnormal state of the point-to-point direct link, causing data loss or bit errors. Based on the optimized link maintenance mechanism, the reliability of the 400M wireless communication link transmission is effectively guaranteed.

[0038] 2. Introducing relay radios, during the heavy-load train group tracking process, the point-to-point direct link is abnormal due to obstacles. On the premise that the wireless communication link between the 400M on-board radio and the relay radio is normal, the relay wireless transmission channel is selected to send the vehicle data, which effectively ensures the reliability of the 400M wireless communication link transmission.

[0039] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A schematic flow chart of a wireless communication method for a heavy-load group train according to an embodiment of the present invention is shown;

[0042] Figure 2 A schematic diagram of application networking according to this embodiment of the present invention is shown;

[0043] Figure 3 A schematic diagram of a communication link according to this embodiment of the present invention is shown;

[0044] Figure 4 A schematic diagram of link status determination logic according to this embodiment of the present invention is shown;

[0045] Figure 5 A schematic diagram of wireless signal coverage of a relay station according to this embodiment of the present invention is shown;

[0046] Figure 6 A schematic diagram of a time window filter according to this embodiment is shown;

[0047] Figure 7 A schematic structural diagram of a wireless communication system for heavy-load group trains according to this embodiment of the present invention is shown;

[0048] Figure 8 A schematic structural diagram of an electronic device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Figure 1 FIG. 4 is a flow chart showing a method for wireless communication of a heavy-load group train according to an embodiment of the present invention. Figure 1 As shown, a wireless communication method for a heavy-load group train according to an embodiment of the present invention includes:

[0051] Using the onboard radio of each train in the heavy-load group train to construct a direct link between two adjacent trains, and construct a relay link between the onboard radio and the relay radio;

[0052] Each train establishes a service layer communication link between its own automatic train protection system and the automatic train protection system of an adjacent train based on the established network layer communication link; wherein the network layer communication link includes a direct link and a relay link;

[0053] After the business layer communication link is established, each train uses the on-board radio to send communication data messages to the preceding and following trains according to a preset time period.

[0054] In this embodiment, the vehicle radio uses a 400-470MHz frequency band to transmit data. A heavy-load group freight train has a 400M vehicle radio installed at the head or tail of each train. The 400M vehicle radio mainly provides communication services for the automatic train protection system (ATP) on the train and provides a communication channel at the network level.

[0055] like Figure 2 As shown, it is a schematic diagram of the application network of this embodiment, where, for ease of understanding, train 2 is defined as the current vehicle, and train 1 and train 3 are the adjacent front and rear vehicles, respectively. This definition does not limit the behavior of the train itself. In this embodiment, the time period is 1 second, and train 2 will periodically send vehicle-to-vehicle communication data to train 1 and train 3 every 1 second to maintain the heavy-load group freight trains and mutual perception between trains to achieve train tracking. Only on the basis of a stable and reliable communication link can the train ATP in the group control the running distance between vehicles and ensure that the train runs at the minimum safe distance (usually between 1 and 2 kilometers) to provide efficient transportation services.

[0056] Optionally, also include:

[0057] Configure a unique network address for each train in the heavy-load group train and set the port number according to the communication direction;

[0058] When the on-board radio of a train receives a communication data message sent by an adjacent train, it parses the communication data message and obtains the network address and port number, and determines whether the received communication data message belongs to the preceding train or the succeeding train based on the obtained network address and port number.

[0059] like Figure 3 As shown, it is a schematic diagram of the communication link of this embodiment. Under normal circumstances, the on-board radio uses a broadcast mechanism to send data to the air interface. When the on-board radio of Train 2 sends communication data messages to Train 1 and Train 3, the on-board radios of Train 1 and Train 3 will determine whether the destination address of the data belongs to this train when receiving the data. If not, it will be discarded directly, otherwise it will be received.

[0060] Optionally, when the train's onboard radio sends the communication data message, the link status of the network layer communication link is determined to obtain a link status result, and a direct link or a relay link is selected based on the link status result to send the communication data message.

[0061] Optionally, determining the link status of the network layer communication link specifically includes:

[0062] Determine whether the communication data message sent by the adjacent train and the link status message sent by the relay station are received:

[0063] If the communication data message and the link status message are not received, a link status result indicating that the link is not activated is obtained;

[0064] If the communication data message with correct CRC is received in the first continuous time window, a normal link status result of the through link is obtained; if the communication data message is not received in the second continuous time window under the normal state of the through link, a link status result of the through link loss is obtained;

[0065] If the link status message with correct CRC is received within the first continuous time window, a link status result indicating that the relay link is normal is obtained; if the link status message is not received within the second continuous time window while the relay link is normal, a link status result indicating that the relay link is lost is obtained;

[0066] If the communication data message and the link status message with correct CRC are received within the first continuous time window, the link status result of the direct / relay link being normal is obtained; if the communication data message and the link status message are not received within the second continuous time window while the direct / relay link is in a normal state, the link status result of the direct link being lost and the relay link being lost is obtained.

[0067] like Figure 4 As shown, it is a logical diagram of link status judgment of this embodiment, in which a cyclic redundancy check (CRC) check is introduced. In this embodiment, the first continuous time window is 6 seconds. If a data message with correct CRC is received for 6 consecutive seconds, the link is judged to be normal. When the link is lost, whether the link is restored is also judged by whether a data message with correct CRC is received for 6 consecutive seconds. The second continuous time window is 3 seconds. When no message is received for 3 seconds, the corresponding link is considered to be lost. Among them, the judgment basis of relay link and direct link message is: in the received message header, a label of message routing record is included. When the message is forwarded via a relay, a hop record is added to the message header for each forwarding via a relay.

[0068] In this embodiment, there may be data sent from train 2 to train 3, which is transmitted to train 3 through a point-to-point direct link and forwarded to train 3 through an interrupt radio. In view of the following situation, the onboard radio of train 3 has a data duplication filtering mechanism, which preferentially processes the data sent by train 2 that are received successively.

[0069] Optionally, the wireless signal coverage area of ​​the relay station is set according to the maximum tracking distance between two adjacent trains in the heavy-load group train and the distance between two adjacent trains.

[0070] In this embodiment, the wireless signal coverage area of ​​the relay station is:

[0071] Range≈(D+2*T)

[0072] Among them, Range represents the wireless signal coverage area, D represents the maximum tracking distance between two adjacent trains, and T represents the distance between two adjacent trains.

[0073] like Figure 5 As shown, it is a schematic diagram of the wireless signal coverage of the relay station in this embodiment. In actual engineering applications, the relay station is installed in scenes such as woods, hills, and tunnels in areas with poor communication quality. The relay station periodically sends link status packets within the signal coverage range. Train 2 is within the wireless signal coverage range of the relay station, senses the relay station, and receives and processes the link status message of the relay station.

[0074] like Figure 6 As shown, it is a schematic diagram of the time window filter of this embodiment. As the train continues to move forward, the direct link between train 2 and train 3 will be interrupted or packet loss will occur due to the weakening of the signal. At this time, when the current vehicle (train 2) sends a message to the front vehicle (train 3), it can request the relay station to forward it. To ensure the communication link at the network level. Since the ATP of the two vehicles judges whether the link at the business level is interrupted based on: if the sent business message loses 6 frames continuously, it is considered that the business is interrupted. If the point-to-point direct link is interrupted, resulting in link packet loss at the business layer, then before the business layer loses 6 frames continuously, if the communication link between the two vehicles can rely on the transmission of the relay link to ensure the continued loss of business data, then the business link can be maintained without interruption, and the two vehicles can be prevented from being unable to track due to the interruption of the business layer link, causing a safety accident. As the train continues to move forward and out of the signal blind area, the point-to-point direct link returns to normal after receiving 6 correct messages in succession (no CRC abnormality is calculated). When the onboard radio enters the normal state of the direct / relay link, the preceding train (Train 3) will receive two copies of the same data. Therefore, the data needs to be filtered for duplicates.

[0075] Optionally, the data duplication filtering process specifically includes:

[0076] Utilizing the vehicle-mounted radio station to cache the received communication data message into a time window filter; wherein the time window filter is used to cache the communication data message for a preset time threshold;

[0077] Determine whether the communication data message newly entering the time window filter is consistent with the communication data message cached in the time window filter; if they are consistent, discard the newly entered communication data message; if they are inconsistent, retain the newly entered communication data message;

[0078] The communication data message output by the time window filter is forwarded to the train automatic protection system.

[0079] In this embodiment, by designing a time window filter, the problem of duplicate messages can be effectively handled while maintaining data real-time, ensuring that ATP can accurately receive necessary communication data messages.

[0080] Optionally, also include:

[0081] Performing time synchronization on each train in the heavy-load group train;

[0082] Dividing the time period slice into a plurality of time transmission channels;

[0083] A time transmission channel is allocated to each train, so that each train transmits data according to the time transmission channel allocated to itself.

[0084] In this embodiment, since the time period is 1 second, the Beidou 1PPS signal is used as a reference to slice the time and divide it into multiple time transmission channels. The heavy-load group freight trains use different time intervals (0 to 999 milliseconds) for data transmission.

[0085] Based on Figure 1 Based on the same principle as the method shown in , the embodiment of the present invention also provides a wireless communication system for heavy-load group trains, such as Figure 7 As shown in, including:

[0086] A network layer module, used to construct a direct link between two adjacent trains using the onboard radio of each train in the heavy-load group train, and to construct a relay link between the onboard radio and the relay radio;

[0087] A business layer module, used for each train to establish a business layer communication link between its own automatic train protection system and the automatic train protection system of an adjacent train based on the established network layer communication link; wherein the network layer communication link includes a direct link and a relay link;

[0088] The data transmission module is used for each train to use the on-board radio to send communication data messages to the preceding and following trains according to a preset time period after the business layer communication link is established.

[0089] The heavy-load group train wireless communication system of the embodiment of the present invention can execute the heavy-load group train wireless communication method provided by the embodiment of the present invention, and the implementation principle is similar. The actions performed by each module and unit in the heavy-load group train wireless communication system in each embodiment of the present invention correspond to the steps in the heavy-load group train wireless communication method in each embodiment of the present invention. For the detailed functional description of each module of the heavy-load group train wireless communication system, please refer to the description in the corresponding heavy-load group train wireless communication method shown in the previous text, which will not be repeated here.

[0090] Based on the same principle as the method shown in the embodiments of the present invention, an electronic device is also provided in the embodiments of the present invention, which may include but is not limited to: a processor and a memory; the memory is used to store a computer program; the processor is used to execute the method shown in any embodiment of the present invention by calling the computer program.

[0091] In an alternative embodiment, an electronic device is provided, such as Figure 8 As shown, Figure 8 The electronic device shown includes: a processor and a memory. The processor and the memory are connected, such as through a bus. Optionally, the electronic device may also include a transceiver, which may be used for data exchange between the electronic device and other electronic devices, such as data transmission and / or data reception. It should be noted that in actual applications, the transceiver is not limited to one, and the structure of the electronic device does not constitute a limitation on the embodiments of the present invention.

[0092] The memory is used to store the application code (computer program) for executing the solution of the present invention, and the execution is controlled by the processor. The processor is used to execute the application code stored in the memory to implement the content shown in the above method embodiment.

[0093] The electronic device may also be a terminal device. Figure 8 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0094] An embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer-readable storage medium is run on a computer, the computer can execute the corresponding contents of the aforementioned method embodiment.

[0095] According to another aspect of the present invention, a computer program product or a computer program is also provided, the computer program product or the computer program comprising computer instructions, the computer instructions being stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the methods provided in the implementation modes of the above-mentioned various embodiments.

[0096] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the disclosure scope involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present invention (but not limited to) by each other.

Claims

1. A wireless communication method for heavy-load group trains, characterized in that: The method comprises: Using the onboard radio of each train in the heavy-load group train to construct a direct link between two adjacent trains, and construct a relay link between the onboard radio and the relay radio; Each train establishes a service layer communication link between its own automatic train protection system and the automatic train protection system of an adjacent train based on the established network layer communication link; wherein the network layer communication link includes a direct link and a relay link; After the business layer communication link is established, each train uses the on-board radio to send communication data messages to the preceding and following trains according to a preset time period.

2. A wireless communication method for heavy-load group trains according to claim 1, characterized in that: include: Configure a unique network address for each train in the heavy-load group train and set the port number according to the communication direction; When the on-board radio of a train receives a communication data message sent by an adjacent train, it parses the communication data message and obtains the network address and port number, and determines whether the received communication data message belongs to the preceding train or the succeeding train based on the obtained network address and port number.

3. A wireless communication method for heavy-load group trains according to claim 1, characterized in that: When the train's onboard radio sends the communication data message, the link status of the network layer communication link is determined to obtain a link status result, and a direct link or a relay link is selected based on the link status result to send the communication data message.

4. A wireless communication method for heavy-load group trains according to claim 3, characterized in that: Determining the link status of the network layer communication link specifically includes: Determine whether the communication data message sent by the adjacent train and the link status message sent by the relay station are received: If the communication data message and the link status message are not received, a link status result indicating that the link is not activated is obtained; If the communication data message with correct CRC is received in the first continuous time window, a normal link status result of the through link is obtained; if the communication data message is not received in the second continuous time window under the normal state of the through link, a link status result of the through link loss is obtained; If the link status message with correct CRC is received within the first continuous time window, a link status result indicating that the relay link is normal is obtained; if the link status message is not received within the second continuous time window while the relay link is normal, a link status result indicating that the relay link is lost is obtained; If the communication data message and the link status message with correct CRC are received within the first continuous time window, the link status result of the direct / relay link being normal is obtained; if the communication data message and the link status message are not received within the second continuous time window while the direct / relay link is in a normal state, the link status result of the direct link being lost and the relay link being lost is obtained.

5. A wireless communication method for heavy-load group trains according to claim 1, characterized in that: The wireless signal coverage area of ​​the relay station is set according to the maximum tracking distance between two adjacent trains in the heavy-load group train and the distance between the two adjacent trains.

6. A wireless communication method for heavy-load group trains according to claim 4, characterized in that: include: Utilizing the vehicle-mounted radio station to cache the received communication data message into a time window filter; wherein the time window filter is used to cache the communication data message for a preset time threshold; Determine whether the communication data message newly entering the time window filter is consistent with the communication data message cached in the time window filter; if they are consistent, discard the newly entered communication data message; if they are inconsistent, retain the newly entered communication data message; The communication data message output by the time window filter is forwarded to the train automatic protection system.

7. A wireless communication method for heavy-load group trains according to claim 4, characterized in that: Also includes: Performing time synchronization on each train in the heavy-load group train; Dividing the time period slice into a plurality of time transmission channels; A time transmission channel is allocated to each train, so that each train transmits data according to the time transmission channel allocated to itself.

8. A wireless communication system for heavy-load group trains, characterized in that: include: A network layer module, used to construct a direct link between two adjacent trains using the onboard radio of each train in the heavy-load group train, and to construct a relay link between the onboard radio and the relay radio; A business layer module, used for each train to establish a business layer communication link between its own automatic train protection system and the automatic train protection system of an adjacent train based on the established network layer communication link; wherein the network layer communication link includes a direct link and a relay link; The data transmission module is used for each train to use the on-board radio to send communication data messages to the preceding and following trains according to a preset time period after the business layer communication link is established.

9. An electronic device, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 7 when executing the computer program.

10. A computer storage medium, characterized in that: The computer storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

Images