Multi-redundancy train-ground communication system and communication method

Abstract

The invention relates to a multi-redundancy vehicle-ground communication system, which comprises a plurality of vehicle-mounted signal devices, a plurality of communication devices and a plurality of communication devices, a plurality of vehicle-mounted special communication channel selection devices, wherein each vehicle-mounted special communication channel selection device is in communication connection with the respective corresponding vehicle-mounted signal device; a plurality of trackside special communication channel selection devices, wherein each trackside special communication channel selection device is in communication connection with the respective corresponding vehicle-mounted special communication channel selection device through a group of vehicle-ground wireless communication links; and a plurality of trackside signal devices, wherein each trackside signal device is in communication connection with the corresponding trackside dedicated communication channel selection device. The invention further provides a multi-redundancy communication method, the availability and reliability of train-ground wireless communication of the existing signal system are improved, the train-ground wireless communication scheme can support simultaneous work of at most four train-ground wireless communication links, and the multi-redundancy communication method has great practical value.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-ground communication, and in particular to a multiple redundant communication system and a communication method. Background Art

[0002] Communication Based Train Control System (CBTC) lines generally use Wireless Fidelity (WIFI) solutions (two independent WIFI networks) or Long Term Evolution (LTE) solutions (two independent LTE networks) as the train-to-ground communication channel. However, there are also some subway lines with dual networks and a total of four wireless links between the train and the ground in the signal system. The two networks of the signal system communicate with the ground through one WIFI network and one LTE network respectively.

[0003] When some existing subway lines use WIFI solutions for CBTC train-to-ground transmission, WIFI uses the 802.11g narrowband solution. If there is a plan to extend the line in the future, the train-to-ground communication solution will be changed to the LTE+WIFI solution. At this time, if the single network of the extension line also uses the 802.11g narrowband solution, there will only be two wireless links, LTE and 802.11g narrowband WIFI, on the entire line. Since the life cycle of the 802.11g narrowband WIFI product has ended, the old 802.11g narrowband + LTE solution is not considered for the extension line, but the latest WIFI6 + LTE solution is used instead. At the same time, the existing line adds LTE wireless links on the basis of 802.11g. Since the existing 802.11g solution is not compatible with WIFI6 technology, if the extension line adopts the WIFI6 solution, it is equivalent to the entire line's train-to-ground wireless system cumulatively using three wireless technologies: 802.11g / WIFI6 / LTE. On-board terminals of three types of equipment need to be installed at each end of the train, and the problem of how the signal system's train-to-ground communication and train control data can be seamlessly switched between the three wireless links needs to be solved.

[0004] Existing network equipment supports data transmission and routing through up to two wireless links at the same time. In order to meet the above-mentioned demand for transmission through three wireless links at the same time and taking into account long-term needs, the present invention provides a multiple redundant communication system and communication method that supports simultaneous communication through up to four wireless links.

[0005] It should be understood that the above statements merely provide background technology related to the present invention and do not necessarily constitute prior art. Summary of the invention

[0006] The object of the present invention is to provide a multiple redundant vehicle-to-ground communication system and communication method, so as to improve the availability and reliability of vehicle-to-ground wireless communication in an existing signal system, and enable the vehicle-to-ground wireless communication scheme to support up to four vehicle-to-ground wireless communication links to work simultaneously.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a multiple redundant vehicle-to-ground communication system, comprising: a plurality of vehicle-mounted signal devices; a plurality of vehicle-mounted dedicated communication channel selection devices, each of the vehicle-mounted dedicated communication channel selection devices is respectively communicatively connected to its corresponding vehicle-mounted signal device; a plurality of trackside dedicated communication channel selection devices, each of the trackside dedicated communication channel selection devices is respectively communicatively connected to its corresponding vehicle-mounted dedicated communication channel selection device through a group of vehicle-to-ground wireless communication links; a plurality of trackside signal devices, each of the trackside signal devices is respectively communicatively connected to its corresponding trackside dedicated communication channel selection device.

[0008] Preferably, each of the on-board signal devices is arranged at a different position on the train; and the on-board signal devices arranged at different positions on the train communicate with a trackside signal device via a group of vehicle-to-ground wireless communication link groups respectively.

[0009] Preferably, the multiple wireless link groups at different positions of the train are independent of each other.

[0010] Preferably, each vehicle-to-ground wireless communication link group includes at most four vehicle-to-ground wireless communication links.

[0011] Preferably, a vehicle-mounted three-layer switch is arranged between each of the vehicle-mounted signaling devices and its corresponding vehicle-mounted dedicated communication channel selection device; a trackside three-layer switch is arranged between each of the trackside signaling devices and its corresponding trackside dedicated communication channel selection device.

[0012] Preferably, each vehicle-to-ground wireless communication link in different vehicle-to-ground wireless communication link groups uses a different transmission medium network, but each vehicle-to-ground wireless communication link in each group uses the same channel selection protocol.

[0013] Preferably, each of the vehicle-to-ground wireless communication links comprises: a wireless link vehicle-mounted terminal, which is communicatively connected to the vehicle-mounted dedicated communication channel selection device corresponding to the vehicle-to-ground wireless communication link group; and a wireless link trackside device, one end of which is communicatively connected to the corresponding wireless link vehicle-mounted terminal, and the other end of which is communicatively connected to the trackside dedicated communication channel selection device corresponding to the vehicle-to-ground wireless communication link group.

[0014] The present invention provides a multiple redundant communication method, which is implemented by the above-mentioned multiple redundant vehicle-to-ground communication system, wherein sending a data packet from a vehicle-mounted signal device to a trackside signal device comprises the following steps: S11, the data packet sent by the vehicle-mounted signal device is forwarded by the vehicle-mounted three-layer switch and arrives at the vehicle-mounted dedicated communication channel selection device; S21, the vehicle-mounted dedicated communication channel selection device copies the data packet into a number of data packets corresponding to the number of vehicle-to-ground wireless communication links, and sends each data packet to the Ethernet port of each vehicle-to-ground wireless communication link respectively; S31, each vehicle-to-ground wireless communication link transmits the data packet to the trackside dedicated communication channel selection device via its own wireless link; S41, after receiving the data packets forwarded by each vehicle-to-ground wireless communication link, the trackside dedicated communication channel selection device determines the first data packet to arrive therein, and forwards the first data packet to the trackside three-layer switch; S51, the trackside three-layer switch forwards the received data packet to the trackside signal device.

[0015] Preferably, in S21, the vehicle-mounted dedicated communication channel selection device will add a channel selection protocol tag to each data packet when copying the data packet.

[0016] Preferably, in S41, if the trackside dedicated communication channel selection device receives a later arriving data packet containing the same channel selection protocol tag, it is discarded.

[0017] The present invention provides a multiple redundant communication method, which is implemented by the above-mentioned multiple redundant vehicle-to-ground communication system, wherein sending a data packet from a trackside signal device to an on-board signal device comprises the following steps: S12, the data packet sent by the trackside signal device is forwarded by the trackside three-layer switch and arrives at the trackside dedicated communication channel selection device; S22, the trackside dedicated communication channel selection device copies the data packet into a number of data packets corresponding to the number of vehicle-to-ground wireless communication links, and sends each data packet to the Ethernet port of each vehicle-to-ground wireless communication link respectively; S32, each vehicle-to-ground wireless communication link transmits the data packet to the on-board dedicated communication channel selection device via its own wireless link; S42, after receiving the data packets forwarded by each vehicle-to-ground wireless communication link, the on-board dedicated communication channel selection device determines the first data packet to arrive therein, and forwards the first data packet to the on-board three-layer switch; S52, the on-board three-layer switch forwards the received data packet to the on-board signal device.

[0018] Preferably, in S22, the trackside dedicated communication channel selection device will add a channel selection protocol label to each data packet when copying the data packet.

[0019] Preferably, in the above S42, if the vehicle-mounted dedicated communication channel selection device receives a later-arriving data packet containing the same channel selection protocol tag, it is discarded.

[0020] The present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned multiple redundant communication method is implemented.

[0021] The present invention also provides an electronic device, including a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the above-mentioned multiple redundant communication method is implemented.

[0022] In summary, compared with the prior art, the multiple redundant vehicle-to-ground communication system and communication method provided by the present invention have at least the following beneficial effects:

[0023] (1) Higher availability of vehicle-to-ground communication. Each wireless network of vehicle-to-ground communication can be configured with up to four vehicle-to-ground wireless communication links, and multiple vehicle-to-ground wireless communication links are used for data communication at the same time. If one vehicle-to-ground wireless communication link fails, it can be switched to other vehicle-to-ground wireless communication links in real time.

[0024] (2) The anti-interference performance of the train-to-ground communication is stronger. The multiple train-to-ground wireless communication links of the CBTC system use wireless links of different frequency bands and different standards. That is, each train-to-ground wireless communication link in each group uses a different transmission medium network. Only when all the train-to-ground wireless communication links are disturbed at the same time will the train-to-ground communication be affected. The anti-interference performance of the train-to-ground wireless system is better.

[0025] (3) The transmission performance of vehicle-to-ground wireless communication is better. Since each vehicle-mounted signal device has up to four vehicle-to-ground wireless communication links available at the same time, and the dedicated communication channel selection device will select the vehicle-to-ground wireless communication link with better transmission performance for vehicle-to-ground communication in real time, the vehicle-to-ground wireless transmission performance indicators such as throughput, packet loss rate, and delay in the present invention are better than those of the existing vehicle-to-ground wireless system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a multiple redundant vehicle-to-ground communication system provided by the present invention;

[0027] Figure 2 A schematic flow chart of a vehicle-to-ground communication method of a multiple redundant vehicle-to-ground communication system provided by the present invention. DETAILED DESCRIPTION

[0028] The following is combined with Figures 1-2 , the present invention is further explained by describing a preferred specific embodiment in detail.

[0029] It should be noted that the drawings are in a very simplified form and use non-precise proportions. They are only used to conveniently and clearly assist in explaining the embodiments of the present invention, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention.

[0030] It should be noted that, in the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only the elements explicitly listed, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0031] like Figure 1 As shown, the present invention provides a multiple redundant vehicle-to-ground communication system, comprising: multiple vehicle-mounted signal devices 11 and multiple trackside signal devices 21 arranged on each train; the vehicle-mounted signal devices 11 arranged at different positions of the train communicate with one trackside signal device 21 through a set of vehicle-to-ground wireless communication link groups, respectively, and the multiple wireless link groups at different positions of the train are independent of each other. Each vehicle-to-ground wireless communication link group includes multiple vehicle-to-ground wireless communication links.

[0032] In a preferred embodiment of the present invention, a vehicle-mounted signal device 11 is respectively provided at the front and rear of each train, wherein the vehicle-mounted signal device 11 provided at the front communicates with a trackside signal device 21 via a set of multiple vehicle-to-ground wireless communication links, and the vehicle-mounted signal device 11 provided at the rear communicates with another trackside signal device 21 via another set of multiple vehicle-to-ground wireless communication links; wherein the wireless links at the front and rear are independent of each other. This case will be described in detail later by taking the example of providing a vehicle-mounted signal device 11 at the front and rear of each train.

[0033] The multiple redundant communication system further includes: a plurality of on-board signal transmission devices arranged on the train, each of which is connected and arranged in a one-to-one correspondence with each on-board signal device 11; and a plurality of trackside signal transmission devices arranged on the trackside, each of which is connected and arranged in a one-to-one correspondence with each trackside signal device 21; the on-board signal transmission devices and the trackside signal transmission devices have the same structure and function, and are used to process and select the transmitted data.

[0034] In one embodiment of the present invention, the functions of the on-board signal transmission device and the trackside signal transmission device are explained by taking the on-board signal device 11 sending data to the trackside signal device 21 as an example.

[0035] The vehicle-mounted signal transmission device comprises:

[0036] The on-board three-layer switch 12 is used for three-layer routing between the on-board signal device 11 and the trackside signal device 12, which is connected to the on-board signal device 11 and receives data packets sent by the on-board signal device 11;

[0037] The vehicle-mounted dedicated communication channel selection device 13 is connected to the vehicle-mounted three-layer switch 12, receives the data packets forwarded by the vehicle-mounted three-layer switch 12, and copies the received data packets into data packets corresponding to the number of vehicle-ground wireless communication links, and then labels each data packet and forwards it to each vehicle-ground wireless communication link.

[0038] Among them, Figure 1 As shown, in this embodiment, a group of four vehicle-to-ground wireless communication links are set between the vehicle-mounted signal device 11 and the trackside signal device 21. Each of the vehicle-to-ground wireless communication links includes: a wireless link vehicle-mounted terminal 15 and a wireless link trackside device 25 connected thereto, and the wireless link vehicle-mounted terminal 15 in each vehicle-to-ground wireless communication link is connected to the vehicle-mounted dedicated communication channel selection device 13. The wireless link vehicle-mounted terminal 15 in each vehicle-to-ground wireless communication link receives a data packet through its Ethernet port and sends it to the wireless link trackside device 25 connected thereto through the vehicle-to-ground wireless communication link to which it belongs.

[0039] Similarly, the trackside signal transmission equipment includes:

[0040] A trackside dedicated communication channel selection device 23, which is connected to each wireless link trackside device 25 in the vehicle-ground wireless communication link, and receives data packets sent to it by the wireless link trackside device 25 in each vehicle-ground wireless communication link;

[0041] The trackside three-layer switch 22 is respectively connected to the trackside dedicated communication channel selection device 23 and the trackside signal device 21. The trackside three-layer switch 22 receives the first received data packet forwarded by the trackside dedicated communication channel selection device 23, and then forwards it to the trackside signal device 21.

[0042] Similarly, when the trackside signal equipment 21 sends data to the on-board signal equipment 11, the on-board signal transmission equipment has the same function as the trackside signal transmission equipment, and only the data transmission direction is different. The data forwarding of the on-board signal equipment at the front and rear ends of the train are independent of each other and use the same data forwarding process.

[0043] The present invention provides at most four relatively independent train-to-ground wireless communication links at the front and rear of each train, that is, at most four train-to-ground wireless communication links are available at the same time at the front and rear communication networks.

[0044] In one embodiment of the present invention, different vehicle-to-ground wireless communication link groups at the front or rear of the vehicle all use wireless links of different frequency bands and different standards, that is, each wireless communication link in each group uses a different transmission medium network, which can be a combination of LTE, WIFI3, WIFI6 or newer versions of wireless communication solutions, or a combination of different frequency band WIFI solutions or different frequency band LTE solutions. It is preferred to use a combination of wireless solutions (LTE and WIFI) of different standards to enhance the anti-interference ability of the system. However, each wireless communication link in each group needs to select the same channel selection protocol.

[0045] The two ends of the train-to-ground wireless communication link are connected to the dedicated communication channel selection device (onboard or trackside) and the three-layer switch (onboard or trackside) in turn, and the physical interface is directly connected to the trackside or onboard signal equipment through the trackside or onboard three-layer switch. At the interface between the trackside or onboard signal equipment and the train-to-ground wireless communication link, by adding a dedicated communication channel selection device to the trackside signal transmission equipment and the onboard signal transmission equipment on each train, the optimal communication link can be selected between up to four different train-to-ground wireless communication links, making the optional wireless solution combination between the train and the ground more flexible.

[0046] like Figure 2 As shown, the present invention also provides a multiple redundant communication method (taking the data packet forwarding process from the vehicle-mounted signal device 11 to the trackside signal device 12 as an example, wherein the data packet forwarding process from the trackside to the vehicle-mounted direction is completely reversed), comprising the following steps:

[0047] S11, the data packet sent by the vehicle-mounted signal device 11 is forwarded by the vehicle-mounted three-layer switch 12 and arrives at the vehicle-mounted dedicated communication channel selection device 13;

[0048] S21, the vehicle-mounted dedicated communication channel selection device 13 copies the data packet into data packets of a number corresponding to the number of vehicle-to-ground wireless communication links, adds a channel selection protocol tag to each data packet, and simultaneously sends each data packet to the Ethernet port of each vehicle-to-ground wireless communication link;

[0049] S31, each vehicle-to-ground wireless communication link transmits the data packet to the trackside dedicated communication channel selection device 23 via its own wireless link;

[0050] S41, after receiving the data packets forwarded by each vehicle-ground wireless communication link, the trackside dedicated communication channel selection device 23 determines the first data packet to arrive, forwards the first data packet to the trackside three-layer switch 22, and discards the later data packets containing the same channel selection protocol label;

[0051] S51 , the trackside layer 3 switch 22 forwards the received data packet to the trackside signal device 21 .

[0052] Similarly, a multiple redundant communication method provided by the present invention (taking the data packet forwarding process from the trackside signal device 12 to the vehicle-mounted signal device 11 as an example) includes the following steps:

[0053] S12, the data packet sent by the trackside signal device 12 is forwarded by the trackside three-layer switch 22 and reaches the trackside dedicated communication channel selection device 23;

[0054] S22, the trackside dedicated communication channel selection device 23 copies the data packet into data packets of a number corresponding to the number of vehicle-to-ground wireless communication links, adds a channel selection protocol tag to each data packet, and simultaneously sends each data packet to the Ethernet port of each vehicle-to-ground wireless communication link;

[0055] S32, each vehicle-to-ground wireless communication link transmits the data packet to the vehicle-mounted dedicated communication channel selection device 13 via its own wireless link;

[0056] S42, after receiving the data packets forwarded by each vehicle-ground wireless communication link, the vehicle-mounted dedicated communication channel selection device 13 determines the first data packet to arrive, forwards the first data packet to the vehicle-mounted layer 3 switch 12, and discards the later-arrived data packets containing the same channel selection protocol tag;

[0057] S52 , the vehicle-mounted layer 3 switch 12 forwards the received data packet to the vehicle-mounted signaling device 11 .

[0058] It should be noted that, in the present invention, each vehicle-to-ground wireless communication link in each group uses a different transmission medium network, but uses the same channel selection protocol.

[0059] Based on the existing CBTC train-to-ground wireless communication link with one train-to-ground wireless communication link at the front and rear of the train, the present invention can add up to three redundancies of train-to-ground wireless communication links, so that there are up to four relatively independent wireless links available for communication between the train-to-ground signal equipment and the trackside signal equipment, and between the train-to-ground signal equipment and the trackside signal equipment. By adding dedicated communication channel selection equipment on the train and the trackside, real-time selection of the current optimal train-to-ground wireless communication link is achieved, ensuring that both directions of the train and the ground can select the wireless link with the best performance among the current maximum of four train-to-ground wireless communication links, thereby improving the reliability of CBTC train-to-ground communication. Dedicated communication channel selection devices are used in pairs, and the on-board dedicated communication channel selection device and the trackside dedicated communication channel selection device are connected by up to four train-to-ground wireless communication links.

[0060] For each end of the train, under normal circumstances, the four train-to-ground wireless communication links work simultaneously, that is, data is sent and received simultaneously. In the event of a failure of one of the train-to-ground wireless communication links, the dedicated communication channel selection device will send and receive data packets transmitted by the remaining normal train-to-ground wireless communication links, that is, the failure of one train-to-ground wireless communication link will not affect the normal train-to-ground communication of the train. When a train-to-ground wireless communication link fails, the dedicated communication channel selection device can still communicate through other available train-to-ground wireless communication links; and in extreme cases, as long as one of the four train-to-ground wireless communication links is working properly, the train and the ground can still communicate normally; this mechanism significantly improves the availability of CBTC train-to-ground communication.

[0061] In one embodiment of the present invention, a maximum of four vehicle-to-ground wireless communication links are in normal working condition, and the on-board three-layer switch forwards the wireless data packet sent from the on-board signal device to the trackside signal device to the on-board dedicated communication channel selection device, and the on-board dedicated communication channel selection device copies the received data packet and forwards it to the wireless link on-board terminal at the same time, and the data packet reaches the wireless link trackside device after passing through four vehicle-to-ground wireless communication links, and the wireless link trackside device forwards the data packet to the trackside dedicated communication channel selection device respectively, and the trackside dedicated communication channel selection device forwards the first received data packet to the trackside three-layer switch, and the trackside three-layer switch forwards the data packet to the trackside signal device.

[0062] Among them, when an abnormality occurs in a vehicle-to-ground wireless communication link, the on-board three-layer switch receives the data packet sent by the on-board signal equipment to the trackside and forwards it to the on-board dedicated communication channel selection device. The on-board dedicated communication channel selection device copies the received data packet and forwards it to the Ethernet port corresponding to other normal vehicle-to-ground wireless communication links for transmission. The data packet passes through the vehicle-to-ground wireless communication link that is still working normally and reaches the wireless link trackside device. The wireless link trackside devices forward the data packets to the trackside dedicated communication channel selection devices respectively. The trackside dedicated communication channel selection devices forward the received data packets to the trackside three-layer switch based on preference, and the trackside three-layer switch forwards the data packets to the trackside signal equipment.

[0063] The present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned multiple redundant communication method is implemented.

[0064] The present invention also provides an electronic device, including a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the above-mentioned multiple redundant communication method is implemented.

[0065] The main purpose of the present invention is to improve the availability and reliability of the existing signal system's vehicle-ground wireless communication, so that the vehicle-ground wireless communication solution can support up to four vehicle-ground wireless communication links working simultaneously. The front and rear of the train can communicate with the trackside signal equipment through up to four vehicle-ground wireless communication links respectively, and all vehicle-ground wireless communication links can work simultaneously. The on-board dedicated communication channel selection device selects the current optimal vehicle-ground wireless communication link for the on-board signal equipment in real time to ensure the quality of the vehicle-ground communication of the on-board signal equipment; at the same time, for the situation where the line is opened in stages, the lines in different periods can flexibly select the current optimal wireless solution, without considering the compatibility between wireless systems at different stages.

[0066] The two sets of train-to-ground wireless communication links at the front and rear of the train of the present invention only provide one IP subnet interface for the on-board signal equipment. For the CBTC system with one set of train-to-ground wireless communication links at the front and rear of the train, the IP addresses of the signal equipment at both ends of the train and the ground do not need to be adjusted. Only multiple redundancies of the train-to-ground wireless communication links are added on the basis of the existing train-to-ground wireless links. For the modification of the existing subway line signal system, wireless redundant links are added, and the modification scope is relatively small, and only the train-to-ground communication network equipment needs to be upgraded.

[0067] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A multiple redundant vehicle-to-ground communication system, characterized in that: Include: Multiple on-board signaling devices; A plurality of vehicle-mounted dedicated communication channel selection devices, each of the vehicle-mounted dedicated communication channel selection devices being respectively communicatively connected with its corresponding vehicle-mounted signaling device; A plurality of trackside dedicated communication channel selection devices, each of the trackside dedicated communication channel selection devices being communicatively connected to its corresponding vehicle-mounted dedicated communication channel selection device via a set of vehicle-to-ground wireless communication links; A plurality of trackside signal devices, each of the trackside signal devices is communicatively connected to its corresponding trackside dedicated communication channel selection device.

2. The multiple redundant vehicle-to-ground communication system according to claim 1, characterized in that: Each of the on-board signal devices is arranged at a different position on the train; The on-board signal equipment arranged at different positions of the train communicates with a trackside signal equipment through a group of train-to-ground wireless communication link groups respectively.

3. The multiple redundant vehicle-to-ground communication system as claimed in claim 2, characterized in that: Multiple wireless link groups at different locations on the train are independent of each other.

4. The multiple redundant vehicle-to-ground communication system as claimed in claim 3, characterized in that: Each vehicle-to-ground wireless communication link group includes at most four vehicle-to-ground wireless communication links.

5. The multiple redundant vehicle-to-ground communication system according to claim 1, characterized in that: A vehicle-mounted three-layer switch is provided between each of the vehicle-mounted signal devices and its corresponding vehicle-mounted dedicated communication channel selection device; A trackside three-layer switch is arranged between each trackside signal device and its corresponding trackside dedicated communication channel selection device.

6. The multiple redundant vehicle-to-ground communication system as claimed in claim 4, characterized in that: Each vehicle-to-ground wireless communication link in different vehicle-to-ground wireless communication link groups selects a different transmission medium network, and each vehicle-to-ground wireless communication link in each group selects the same channel selection protocol.

7. The multiple redundant vehicle-to-ground communication system as claimed in claim 6, characterized in that: Each of the vehicle-to-ground wireless communication links comprises: A wireless link vehicle-mounted terminal is communicatively connected with the vehicle-mounted dedicated communication channel selection device corresponding to the vehicle-to-ground wireless communication link group; A wireless link trackside device, one end of which is communicatively connected to the corresponding wireless link vehicle-mounted terminal, and the other end of which is communicatively connected to the trackside dedicated communication channel selection device corresponding to the vehicle-to-ground wireless communication link group.

8. A multiple redundant communication method, implemented by using the multiple redundant vehicle-to-ground communication system according to any one of claims 1 to 7, characterized in that: Sending a data packet from the onboard signal equipment to the trackside signal equipment includes the following steps: S11, the data packet sent by the vehicle-mounted signal device is forwarded by the vehicle-mounted three-layer switch and then reaches the vehicle-mounted dedicated communication channel selection device; S21, the vehicle-mounted dedicated communication channel selection device copies the data packet into data packets of a number corresponding to the number of vehicle-to-ground wireless communication links, and sends each data packet to the Ethernet port of each vehicle-to-ground wireless communication link respectively; S31, each vehicle-to-ground wireless communication link transmits the data packet to the trackside dedicated communication channel selection device via its own wireless link; S41, after receiving the data packets forwarded by each vehicle-ground wireless communication link, the trackside dedicated communication channel selection device determines the first data packet to arrive, and forwards the first data packet to the trackside three-layer switch; S51, the trackside layer 3 switch forwards the received data packet to the trackside signaling equipment.

9. The multiple redundant communication method according to claim 8, characterized in that: In the above S21, the vehicle-mounted dedicated communication channel selection device will add a channel selection protocol label to each data packet when copying the data packet.

10. The multiple redundant communication method according to claim 9, characterized in that: In the above-mentioned S41, if the trackside dedicated communication channel selection device receives a later-arrived data packet containing the same channel selection protocol tag, it is discarded.

11. A multiple redundant communication method, implemented by using the multiple redundant vehicle-to-ground communication system according to any one of claims 1 to 7, characterized in that: Sending a data packet from the trackside signal equipment to the onboard signal equipment includes the following steps: S12, the data packet sent by the trackside signal device is forwarded by the trackside three-layer switch and then reaches the trackside dedicated communication channel selection device; S22, the trackside dedicated communication channel selection device copies the data packet into data packets of a number corresponding to the number of vehicle-to-ground wireless communication links, and sends each data packet to the Ethernet port of each vehicle-to-ground wireless communication link respectively; S32, each vehicle-to-ground wireless communication link transmits the data packet to the vehicle-mounted dedicated communication channel selection device via its own wireless link; S42, after receiving the data packets forwarded by each vehicle-to-ground wireless communication link, the vehicle-mounted dedicated communication channel selection device determines the first data packet to arrive, and forwards the first data packet to the vehicle-mounted layer 3 switch; S52, the vehicle-mounted layer 3 switch forwards the received data packet to the vehicle-mounted signaling device.

12. The multiple redundant communication method according to claim 11, wherein: In the above S22, the trackside dedicated communication channel selection device will add a channel selection protocol label to each data packet when copying the data packet.

13. The multiple redundant communication method according to claim 12, wherein: In the above S42, if the vehicle-mounted dedicated communication channel selection device receives a later-arrived data packet containing the same channel selection protocol tag, it is discarded.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the multiple redundant communication method according to any one of claims 1 to 13 is implemented.

15. An electronic device, characterized in that: The method comprises a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the multiple redundant communication method according to any one of claims 1 to 13 is implemented.

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