Vehicle-ground data communication system, method, and storage medium

Abstract

Embodiments of the present disclosure provide a train-ground data communication system, method and storage medium, which are applied to the field of rail transit technology. The system comprises a WLAN system, an LTE system and a ground signal network. The WLAN system comprises a first vehicle-mounted subsystem and a first ground subsystem. The first vehicle-mounted subsystem comprises a first communication controller, a vehicle-mounted WLAN device and a first antenna feeder system. The first ground subsystem comprises a ground WLAN device. The LTE system comprises a second vehicle-mounted subsystem and a second ground subsystem. The second vehicle-mounted subsystem comprises a second communication controller, a TAU device and a second antenna feeder system. The second ground subsystem comprises an LTE access network, an LTE core network, an LTE gateway and a ground signal network gateway. The vehicle-mounted controller is connected with the ground signal network through the WLAN system and the LTE system respectively. The ground signal network is connected with a ground signal device. In this way, the existing WLAN mode and the upgraded LTE mode can be compatible with each other.

Description

Technical Field

[0001] This disclosure relates to the field of rail transit technology, and in particular to a vehicle-to-ground data communication system, method, and storage medium. Background Technology

[0002] With the advancement of urbanization and the expansion of urban scale, the pressure on urban transportation has increased dramatically. Urban rail transit is one of the effective methods to solve this problem. Communication-based Train Control (CBTC) systems have become the main control system for urban rail transit.

[0003] In a CBTC system, the vehicle-to-ground data communication system serves as the bridge between the onboard controller and the ground signaling equipment. It enables continuous, bidirectional, high-speed, and reliable data communication between the onboard controller and the ground signaling equipment, thus tightly connecting the system's main component (the ground signaling equipment) and the controlled object (the vehicle). Therefore, the vehicle-to-ground data communication system is fundamental to the CBTC system, and its communication mode has evolved from the initial Wireless Local Area Network (WLAN) technology to Long Term Evolution (LTE) technology.

[0004] Currently, existing vehicle-to-ground data communication systems are generally being upgraded from WLAN to LTE. However, due to the differences in network architecture between the two modes, the CBTC system may experience outages during the upgrade, affecting the overall operation of the rail transit system. Therefore, achieving dual-mode compatibility during the upgrade has become a pressing technical problem that needs to be solved. Summary of the Invention

[0005] Embodiments of this disclosure provide a vehicle-to-ground data communication system, method, and storage medium.

[0006] In a first aspect, embodiments of this disclosure provide a vehicle-to-ground data communication system, which includes: a WLAN system, an LTE system, and a terrestrial signal network;

[0007] The WLAN system includes: a first vehicle-mounted subsystem and a first ground subsystem; the first vehicle-mounted subsystem includes: a first communication controller, vehicle-mounted WLAN equipment, and a first feeder system; the first ground subsystem includes: ground WLAN equipment;

[0008] The vehicle-mounted controller is connected to the ground signal network via a first communication controller, a vehicle-mounted WLAN device, a first feeder system, and a ground WLAN device.

[0009] The LTE system includes: a second vehicle-mounted subsystem and a second ground subsystem; the second vehicle-mounted subsystem includes: a second communication controller, a TAU device, and a second feeder system; the second ground subsystem includes: an LTE access network, an LTE gateway, an LTE core network, and a ground signal network gateway;

[0010] The vehicle-mounted controller is connected to the ground signal network through the second communication controller, TAU equipment, second feeder system, LTE access network, LTE core network, LTE gateway, and ground signal network gateway;

[0011] The terrestrial signal network is connected to the terrestrial signal equipment;

[0012] Data from the vehicle controller is transmitted to the ground signal equipment via a WLAN system and a ground signal network, and data from the ground signal equipment is transmitted to the vehicle controller via a ground signal network and a WLAN system.

[0013] Alternatively, the data from the vehicle controller is transmitted to the ground signal equipment via the LTE system and the ground signal network, and the data from the ground signal equipment is transmitted to the vehicle controller via the ground signal network and the WLAN system.

[0014] In some possible implementations of the first aspect, the LTE access network is an eNode-B network, base station equipment is deployed in a dual-frequency co-location manner, and the LTE core network is shared for both the main line and the test line.

[0015] In some possible implementations of the first aspect, the terrestrial signal network gateway is a dual-redundant gateway, and a dynamic routing method based on link status monitoring is used between it and the LTE gateway.

[0016] In some possible implementations of the first aspect, the second communication controller and the TAU device are powered independently and have their own independent air switches.

[0017] In some possible implementations of the first aspect, the first communication controller and the second communication controller have different IP addresses, and the IP address of the second communication controller is on a different network segment than the IP address of the ground signal equipment.

[0018] In some possible implementations of the first aspect, the engineering data format of the vehicle-to-ground data communication system is compatible with both WLAN and LTE modes.

[0019] Secondly, embodiments of this disclosure provide a vehicle-to-ground data communication method based on the vehicle-to-ground data communication system described above, the method comprising:

[0020] The vehicle-mounted controller communicates with ground signal equipment via the LTE system and ground signal network.

[0021] Alternatively, the vehicle-mounted controller can communicate with ground signal equipment via a WLAN system or a ground signal network.

[0022] In some possible implementations of the second aspect, the onboard controller communicates with ground signal equipment via an LTE system and a terrestrial signal network, including:

[0023] When the vehicle is in operation, the on-board controller communicates with ground signal equipment via WLAN system and ground signal network.

[0024] In some possible implementations of the second aspect, the onboard controller communicates with ground signal equipment via a WLAN system and a ground signal network, including:

[0025] During vehicle commissioning, the onboard controller communicates with ground signal equipment via the LTE system and ground signal network.

[0026] Thirdly, embodiments of this disclosure provide an electronic device comprising: at least one processor; and a memory communicatively connected to the at least one processor; the memory storing instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the method described above.

[0027] Fourthly, embodiments of this disclosure provide a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the methods described above.

[0028] In the embodiments of this disclosure, the vehicle controller is connected to the terrestrial signal network via a WLAN system and an LTE system, respectively; the terrestrial signal network is connected to terrestrial signal equipment; the vehicle controller and the terrestrial signal equipment communicate via the WLAN system and the terrestrial signal network, or via the LTE system and the terrestrial signal network. Independent transmission paths for WLAN mode and LTE mode can be established during the upgrade process, ensuring that the data channels of the existing WLAN mode and the upgraded LTE mode do not interfere with each other, thereby achieving compatibility between the existing WLAN mode and the upgraded LTE mode, and ensuring that the upgrade process does not affect CBTC operation.

[0029] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0030] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. The drawings are provided for a better understanding of the invention and are not intended to limit the scope of this disclosure. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0031] Figure 1 An architecture diagram of a vehicle-to-ground data communication system provided by an embodiment of the present disclosure is shown;

[0032] Figure 2 A flowchart illustrating a vehicle-to-ground data communication method provided by an embodiment of this disclosure is shown;

[0033] Figure 3 A structural diagram of an exemplary electronic device capable of implementing embodiments of the present disclosure is shown. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0035] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0036] To address the problems in the background art, embodiments of this disclosure provide a vehicle-to-ground data communication system, method, and storage medium. Specifically, the vehicle-to-ground data communication system includes: a WLAN system, an LTE system, and a terrestrial signal network; the WLAN system includes: a first vehicle-mounted subsystem and a first ground subsystem; the first vehicle-mounted subsystem includes: a first communication controller, a vehicle-mounted WLAN device, and a first feeder system; the first ground subsystem includes: a ground WLAN device; the LTE system includes: a second vehicle-mounted subsystem and a second ground subsystem; the second vehicle-mounted subsystem includes: a second communication controller, a TAU device, and a second feeder system; the second ground subsystem includes: an LTE access network, an LTE gateway, an LTE core network, and a terrestrial signal network gateway; the vehicle-mounted controller is connected to the terrestrial signal network through the WLAN system and the LTE system respectively; the terrestrial signal network is connected to the terrestrial signal device; the vehicle-mounted controller and the terrestrial signal device communicate via the WLAN system and the terrestrial signal network, or via the LTE system and the terrestrial signal network.

[0037] In this way, independent transmission paths for WLAN mode and LTE mode can be established during the upgrade, so that the data channels of the existing WLAN mode and the upgraded LTE mode do not affect each other, thereby achieving mutual compatibility between the existing WLAN mode and the upgraded LTE mode, and the upgrade process does not affect the operation of CBTC.

[0038] The vehicle-to-ground data communication system, method, and storage medium provided in this disclosure will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Figure 1 An architecture diagram of a vehicle-to-ground data communication system provided by an embodiment of this disclosure is shown, such as... Figure 1 As shown, the vehicle-to-ground data communication system may include: WLAN system, LTE system, and terrestrial signal network.

[0040] The WLAN system includes a first vehicle-mounted subsystem and a first ground subsystem. The first vehicle-mounted subsystem includes a first communication controller, vehicle-mounted WLAN equipment, and a first feeder system; the first ground subsystem includes ground-based WLAN equipment.

[0041] The vehicle-mounted controller is connected to the ground signal network via a first communication controller, a vehicle-mounted WLAN device, a first feeder system, and a ground WLAN device. Specifically, the first communication controller is connected to the vehicle-mounted controller, the vehicle-mounted WLAN device is connected to the first communication controller, the first feeder system is connected to the vehicle-mounted WLAN device and the ground WLAN device, and the ground WLAN device is connected to the ground signal network.

[0042] The LTE system includes a second vehicle-mounted subsystem and a second ground subsystem. The second vehicle-mounted subsystem includes a second communication controller, a TAU device, and a second feeder system; the second ground subsystem includes an LTE access network, an LTE core network, an LTE gateway, and a ground signal network gateway.

[0043] The vehicle-mounted controller is connected to the ground signal network via a second communication controller, a TAU device, a second feeder system, an LTE access network, an LTE core network, an LTE gateway, and a ground signal network gateway. Specifically, the second communication controller is connected to the vehicle-mounted controller, the TAU device is connected to the second communication controller, the second feeder system is connected to the TAU device and the LTE access network, the LTE gateway is connected to the LTE access network, the LTE core network, and the ground signal network gateway, and the ground signal network gateway is connected to the ground signal network.

[0044] The ground signal network is connected to the ground signal equipment.

[0045] Data from the vehicle controller can be transmitted to ground signal equipment via WLAN system and ground signal network, and data from the ground signal equipment can be transmitted to the vehicle controller via ground signal network and WLAN system.

[0046] Specifically, during the vehicle operation period of the upgrade and transformation process, the on-board controller can communicate with the ground signal equipment via WLAN system and ground signal network.

[0047] Alternatively, the data from the vehicle controller can be transmitted to the ground signal equipment via the LTE system and the ground signal network, and the data from the ground signal equipment can be transmitted to the vehicle controller via the ground signal network and the WLAN system.

[0048] Specifically, during the vehicle commissioning period of the upgrade and transformation process, and after the vehicle transformation is completed, the on-board controller and the ground signal equipment can communicate via the LTE system and the ground signal network.

[0049] In the embodiments disclosed herein, the existing WLAN system adopts a Layer 2 local area network and the upgraded LTE system adopts a Layer 3 local area network. This allows for the establishment of independent transmission paths for WLAN mode and LTE mode during the upgrade process, ensuring that the data channels of the existing WLAN mode and the upgraded LTE mode do not interfere with each other. This achieves mutual compatibility between the existing WLAN mode and the upgraded LTE mode, and the upgrade process does not affect the operation of CBTC.

[0050] In some embodiments, the LTE system can be an LTE-M system, which is built independently of the upgrades of other signal systems, with no overlap in engineering implementation and no mutual interference.

[0051] The LTE access network can be an eNode-B network, which uses a dual-frequency co-location method to deploy base station equipment, simplifying the engineering design, site selection and testing, and equipment maintenance of LTE-M.

[0052] The LTE core network can be shared by the main line and the test line, that is, the architecture of sharing the core network between the main line and the test line can simplify the interference debugging of the data communication system between the vehicle base and the test line.

[0053] In some embodiments, the terrestrial signal network gateway can be a dual-redundant gateway to improve reliability, and it adopts a dynamic routing method based on link state monitoring to quickly achieve routing selection between the two.

[0054] In addition, the terrestrial signal network gateway can be set up in the same equipment room as the LTE core network equipment, thereby reducing the workload of engineering implementation.

[0055] In some embodiments, the second communication controller and the TAU device can be powered independently and have their own air switches, which enables independent power supply control and LTE mode switching, thereby improving control efficiency.

[0056] Furthermore, the first communication controller and the second communication controller can have different IP addresses, that is, different IP addresses are used to represent the same vehicle in WLAN mode and LTE mode respectively, and the IP address of the second communication controller is in a different network segment from the IP address of the ground signal equipment. This allows the WLAN system and the LTE system to be in different network segments, further improving the independence and compatibility of WLAN mode and LTE mode.

[0057] In some embodiments, the engineering data format of the vehicle-to-ground data communication system can be compatible with both WLAN and LTE modes. That is, both WLAN and LTE modes can be used with this engineering data format. This allows a single vehicle that has been modified to switch directly to LTE mode and put into operation without having to switch the overall communication standard after all existing vehicles have been modified.

[0058] It is worth noting that after the upgrade of a single vehicle is completed, the first onboard subsystem of that vehicle, namely the equipment related to the WLAN mode, can be removed.

[0059] Figure 2 A flowchart illustrating a vehicle-to-ground data communication method provided by an embodiment of this disclosure is shown, such as... Figure 2 As shown, the vehicle-to-ground data communication method 200 is applied to Figure 1 The vehicle-to-ground data communication system shown includes the following steps:

[0060] S210: The on-board controller communicates with ground signal equipment via the LTE system and ground signal network.

[0061] Alternatively, the vehicle-mounted controller can communicate with ground signal equipment via a WLAN system or a ground signal network.

[0062] In some embodiments, during vehicle operation, the on-board controller can communicate with ground signal equipment via a WLAN system or a ground signal network. In other words, it can freely switch to WLAN mode during vehicle operation periods, thereby effectively ensuring vehicle operation.

[0063] Specifically, data from the vehicle-mounted controller is transmitted to the ground signal equipment via the first communication controller, the vehicle-mounted WLAN device, the first feeder system, the ground WLAN device, and the ground signal network. Conversely, data from the ground signal equipment is transmitted to the vehicle-mounted controller via the same path.

[0064] During vehicle commissioning, the onboard controller can communicate with ground signal equipment via the LTE system and terrestrial signal network. This means that the system can be freely switched to LTE mode during commissioning periods to monitor the LTE system's status, thus improving commissioning efficiency.

[0065] Specifically, data from the vehicle controller is transmitted to the LTE access network via the second communication controller, TAU device, and second feeder system. The LTE access network then sends this data to the LTE core network through the LTE gateway. The LTE core network processes the data and transmits it to the ground signal equipment via the LTE gateway, terrestrial signal network gateway, and terrestrial signal network. Conversely, data from the ground signal equipment is transmitted to the vehicle controller via the same path.

[0066] In the embodiments of this disclosure, independent transmission paths for WLAN mode and LTE mode can be established during the upgrade process, so that the data channels of the existing WLAN mode and the upgraded LTE mode do not affect each other, thereby achieving mutual compatibility between the existing WLAN mode and the upgraded LTE mode, and the upgrade process does not affect the operation of CBTC.

[0067] It is worth noting that switching between WLAN mode and LTE mode can be achieved by modifying engineering data and controlling the power supply of the WLAN system and LTE system, and there are no restrictions on this.

[0068] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this disclosure is not limited to the described order of actions, because according to this disclosure, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this disclosure.

[0069] Figure 3 A structural diagram of an exemplary electronic device capable of implementing embodiments of the present disclosure is shown. Electronic device 300 is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic device 300 may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the present disclosure described and / or claimed herein.

[0070] like Figure 3 As shown, the electronic device 300 may include a computing unit 301, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 302 or a computer program loaded from a storage unit 308 into a random access memory (RAM) 303. The RAM 303 may also store various programs and data required for the operation of the electronic device 300. The computing unit 301, ROM 302, and RAM 303 are interconnected via a bus 304. An input / output (I / O) interface 305 is also connected to the bus 304.

[0071] Multiple components in electronic device 300 are connected to I / O interface 305, including: input unit 306, such as keyboard, mouse, etc.; output unit 307, such as various types of displays, speakers, etc.; storage unit 308, such as disk, optical disk, etc.; and communication unit 309, such as network card, modem, wireless transceiver, etc. Communication unit 309 allows electronic device 300 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0072] The computing unit 301 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 301 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 301 performs the various methods and processes described above, such as method 200. For example, in some embodiments, method 200 may be implemented as a computer program product, including a computer program tangibly contained in a computer-readable medium, such as storage unit 308. In some embodiments, part or all of the computer program may be loaded and / or installed on device 300 via ROM 302 and / or communication unit 309. When the computer program is loaded into RAM 303 and executed by the computing unit 301, one or more steps of method 200 described above may be performed. Alternatively, in other embodiments, the computing unit 301 may be configured to perform method 200 by any other suitable means (e.g., by means of firmware).

[0073] The various embodiments described above can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), system-on-a-chip (SoCs), payload programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0074] The program code used to implement the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor or controller, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0075] In the context of this disclosure, a computer-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of computer-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0076] It should be noted that this disclosure also provides a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to cause a computer to execute method 200 and achieve the corresponding technical effects achieved by the embodiments of this disclosure in executing the method. For the sake of brevity, further details are omitted here.

[0077] In addition, this disclosure also provides a computer program product including a computer program that implements method 200 when executed by a processor.

[0078] To provide interaction with a user, the embodiments described above can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0079] The embodiments described above can be implemented in computing systems that include backend components (e.g., as a data server), or computing systems that include middleware components (e.g., an application server), or computing systems that include frontend components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with the implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication (e.g., a communication network) of any form or medium. Examples of communication networks include local area networks (LANs), wide area networks (WANs), and the Internet.

[0080] Computer systems can include clients and servers. Clients and servers are generally located far apart and typically interact via communication networks. Client-server relationships are created by computer programs running on the respective computers and having a client-server relationship with each other. Servers can be cloud servers, servers in distributed systems, or servers incorporating blockchain technology.

[0081] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and this is not limited herein.

[0082] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A vehicle-to-ground data communication system, characterized in that, The system includes: a WLAN system, an LTE system, and a terrestrial signal network; The WLAN system includes: a first vehicle-mounted subsystem and a first ground subsystem; the first vehicle-mounted subsystem includes: a first communication controller, a vehicle-mounted WLAN device, and a first feeder system; the first ground subsystem includes: a ground WLAN device; The vehicle-mounted controller is connected to the ground signal network through the first communication controller, the vehicle-mounted WLAN device, the first antenna feeder system, and the ground WLAN device; The LTE system includes: a second vehicle-mounted subsystem and a second ground subsystem; the second vehicle-mounted subsystem includes: a second communication controller, a TAU device, and a second feeder system; the second ground subsystem includes: an LTE access network, an LTE core network, an LTE gateway, and a ground signal network gateway; The vehicle controller is connected to the ground signal network via the second communication controller, the TAU device, the second feeder system, the LTE access network, the LTE core network, the LTE gateway, and the ground signal network gateway; The ground signal network is connected to the ground signal equipment; During the vehicle operation period of the upgrade and transformation process, the vehicle controller communicates with the ground signal equipment through the WLAN system and the ground signal network. Specifically, the data of the vehicle controller is transmitted to the ground signal equipment through the WLAN system and the ground signal network, and the data of the ground signal equipment is transmitted to the vehicle controller through the ground signal network and the WLAN system. Alternatively, during the vehicle debugging period of the upgrade and transformation process and after the vehicle transformation is completed, the vehicle controller communicates with the ground signal equipment through the LTE system and the ground signal network. Specifically, the data of the vehicle controller is transmitted to the ground signal equipment through the LTE system and the ground signal network, and the data of the ground signal equipment is transmitted to the vehicle controller through the ground signal network and the WLAN system. After the upgrade of a single vehicle is completed, the vehicle's first onboard subsystem is removed.

2. The system according to claim 1, characterized in that, The LTE access network is an eNode-B network, which uses a dual-frequency co-location method to deploy base station equipment. The LTE core network is used for both the main line and the test line.

3. The system according to claim 1, characterized in that, The terrestrial signal network gateway is a dual-redundant gateway, and it uses a dynamic routing method based on link status monitoring to connect with the LTE gateway.

4. The system according to claim 1, characterized in that, The second communication controller and the TAU device are powered independently and have their own independent air switches.

5. The system according to claim 1, characterized in that, The first communication controller and the second communication controller have different IP addresses, and the IP address of the second communication controller is on a different network segment than the IP address of the ground signal equipment.

6. The system according to claim 1, characterized in that, The engineering data format of the vehicle-to-ground data communication system is compatible with both WLAN and LTE modes.

7. A vehicle-to-ground data communication method based on the vehicle-to-ground data communication system as described in any one of claims 1-6, characterized in that, The method includes: The vehicle-mounted controller communicates with ground signal equipment via the LTE system and ground signal network. Alternatively, the vehicle controller can communicate with ground signal equipment via a WLAN system or a ground signal network. The vehicle-mounted controller communicates with ground signal equipment via an LTE system and a terrestrial signal network, including: During vehicle operation, the on-board controller communicates with ground signal equipment via a WLAN system and a ground signal network. The vehicle-mounted controller communicates with ground signal equipment via a WLAN system and a ground signal network, including: During vehicle commissioning and after vehicle modification, the on-board controller communicates with ground signal equipment via the LTE system and ground signal network.

8. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to perform the method of claim 7.

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