Vehicle-mounted equipment, communication method thereof and train-control train-ground wireless communication system

Abstract

The invention discloses on-board equipment, a communication method thereof and a train control train-ground wireless communication system. The vehicle-mounted equipment comprises a vehicle-mounted host and two control groups; each control group comprises a wireless control module, a radio station adaptation module and a radio station. The vehicle-mounted host determines target ground equipment to be connected, selects one radio station adaptation module as a target radio station adaptation module, and sends a connection establishment request to the target radio station adaptation module through the wireless control module in the same group of the target radio station adaptation module, and the connection establishment request carries IP address information of the target ground equipment; and if any radio station adaptation module receives a connection establishment request, establishing a first packet domain wireless connection through the first radio station based on one IP address of the target ground equipment, and establishing a second packet domain wireless connection through the second radio station based on the other IP address of the target ground equipment. The vehicle-mounted equipment is in wireless communication with the ground equipment through double links, so that the risk of communication timeout of vehicle-ground wireless communication is reduced.

Description

Technical Field

[0001] The present invention relates to the field of train control technology, and in particular to a vehicle-mounted device and a communication method thereof, and a train control vehicle-ground wireless communication system. Background Art

[0002] At present, the high-speed railway CTCS (China Train Control System)-3-level train control system (referred to as C3 train control system) adopts the GSM-R (Global System for Mobile Communications-Railway) network circuit domain wireless communication standard to realize the two-way wireless data transmission between the on-board ATP (Automatic Train Protection) and the ground RBC (Radio Block Center). The CTCS-N new train control system (referred to as CN train control system) ATP and high-speed rail ATO (Automatic Train Operation) both adopt the GSM-R network GPRS (General Packet Radio Service) subsystem packet domain wireless communication standard to realize the two-way wireless data transmission between the on-board equipment and the ground equipment. The packet domain transmission can carry the transmission protocol based on IP (Internet Protocol).

[0003] Both C3 / CN and high-speed rail train control vehicle-to-ground wireless communication systems adopt a single-mode single-link wireless communication transmission method. The on-board equipment includes a host, a dual-series wireless control unit, a dual-series radio adapter, and a dual-series radio. For the C3 train control vehicle-to-ground wireless communication system, under the traditional circuit domain format, each radio can only establish one circuit domain connection, so the circuit domain single-channel connection method is adopted between the on-board equipment and the ground equipment, that is, when the on-board equipment is working, the host establishes a connection with one of the circuit domain interface units of the ground equipment through one of the wireless control units, radio adapters and radios, and the other series of wireless control units, radio adapters and radios in the on-board equipment do not establish a connection with the ground equipment. Although the current CN and high-speed rail train control vehicle-to-ground wireless communication systems are based on the packet domain vehicle-to-ground wireless communication solution, they still adopt a single-mode single-link wireless communication transmission method.

[0004] When the train and the ground adopt a single-mode single-link wireless communication transmission method, under normal circumstances, the on-board host establishes a connection with the ground equipment through one series of radios, and the other series of radios is idle. When a communication failure occurs in one series of radios due to equipment or network reasons, the on-board host needs to switch to another series of radios to establish a connection with the ground. This switching process has a certain delay, which will cause the train-to-ground wireless communication timeout problem of the train control system. In addition, when the train reaches the handover point of the ground equipment during its journey, the normal series of radios are generally used to first disconnect the connection with the supervisory ground equipment (the ground equipment before the handover), and then establish a connection with the receiving ground equipment (the ground equipment after the handover). Disconnecting and establishing the connection requires a certain delay, which will cause the train-to-ground wireless communication timeout problem of the train control system.

[0005] With the construction and deployment of the railway 5G-R (5G-Railway, a new generation of railway mobile communication system based on 5G technology) network, the application of packet domain communication standards for high-speed railway lines will gradually expand. Since the packet domain is capable of carrying communication standards based on IP communication protocols and supports a radio station to establish multiple data connections at the same time, the traditional single-mode single-link wireless communication transmission method does not give full play to the advantages of packet domain communication, and there is a risk of vehicle-ground wireless communication timeout (the host of the on-board equipment cannot receive the application data of the ground equipment within a period of time). Summary of the invention

[0006] The embodiment of the present application provides a vehicle-mounted device, including: a vehicle-mounted host, a first control group and a second control group; the first control group includes: a first wireless control module, a first radio station adapter module and a first radio station; the second control group includes: a second wireless control module, a second radio station adapter module and a second radio station;

[0007] The vehicle-mounted host is configured to determine a target ground device to be connected, select one from the first radio adapter module and the second radio adapter module as a target radio adapter module, and send a connection establishment request to the target radio adapter module through a wireless control module in the same group as the target radio adapter module, wherein the connection establishment request carries the IP address information of the target ground device;

[0008] The first radio station adaptation module is configured to establish a first packet domain wireless connection based on an IP address of the target ground device through the first radio station if a connection establishment request is received, and to establish a second packet domain wireless connection based on another IP address of the target ground device through the second radio station;

[0009] The second radio adapter module is configured to establish a first packet domain wireless connection through the first radio based on an IP address of the target ground device if a connection establishment request is received, and to establish a second packet domain wireless connection through the second radio based on another IP address of the target ground device.

[0010] The present application provides a communication method for a vehicle-mounted device, including:

[0011] The vehicle-mounted host determines the target ground device to be connected, selects one from the first radio adapter module and the second radio adapter module as the target radio adapter module, and sends a connection establishment request to the target radio adapter module through the wireless control module in the same group as the target radio adapter module, wherein the connection establishment request carries the IP address information of the target ground device;

[0012] After receiving the connection establishment request, the target radio station adaptation module establishes a first packet domain wireless connection based on an IP address of the target ground device through a first radio station, and establishes a second packet domain wireless connection based on another IP address of the target ground device through a second radio station;

[0013] Among them, the vehicle-mounted equipment includes a vehicle-mounted host, a first control group and a second control group; the first control group includes: a first wireless control module, a first radio adapter module and a first radio; the second control group includes: a second wireless control module, a second radio adapter module and a second radio.

[0014] An embodiment of the present application provides a train control vehicle-ground wireless communication system, comprising: ground equipment, a wireless communication network and the above-mentioned vehicle-mounted equipment; the ground equipment comprises: a first communication interface unit, a second communication interface unit and a ground host; the first communication interface unit is configured with an IP address, and the second communication interface unit is configured with another IP address; the ground host is configured to establish a first packet domain wireless connection with the vehicle-mounted equipment through the first communication interface unit, and to establish a second packet domain wireless connection with the vehicle-mounted equipment through the second communication interface unit.

[0015] Compared with the related art, the vehicle-mounted device provided by the embodiment of the present application, the vehicle-mounted host determines the target ground device to be connected, selects one from the first radio adapter module and the second radio adapter module as the target radio adapter module, and sends a connection establishment request to the target radio adapter module through the wireless control module in the same group as the target radio adapter module, and the connection establishment request carries the IP address information of the target ground device; if any one of the first radio adapter module and the second radio adapter module receives the connection establishment request, a first packet domain wireless connection is established through the first radio based on an IP address of the target ground device, and a second packet domain wireless connection is established through the second radio based on another IP address of the target ground device. The vehicle-mounted device of the embodiment of the present application communicates wirelessly with the ground device through a dual link, reducing the risk of communication timeout in the vehicle-to-ground wireless communication.

[0016] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0018] Figure 1 A schematic diagram of the structure of a vehicle-mounted device provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of a radio station adapter module provided in an embodiment of the present application being connected to a radio station via a relay module;

[0020] Figure 3 A schematic diagram of a hierarchical structure of a packet domain wireless connection based on a 5G-R network provided in an embodiment of the present application;

[0021] Figure 4 A flow chart of a communication method for a vehicle-mounted device provided in an embodiment of the present application;

[0022] Figure 5 A signal interaction diagram for establishing a connection between a vehicle-mounted device and a ground device provided in an embodiment of the present application;

[0023] Figure 6 A signal interaction diagram for disconnecting a vehicle-mounted device from a ground device provided in an embodiment of the present application;

[0024] Figure 7 A schematic diagram of the structure of a train control vehicle-ground wireless communication system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] The present application describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present application. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0026] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique invention scheme defined by the claims. Any features or elements of any embodiment may also be combined with features or elements from other invention schemes to form another unique invention scheme defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in the present application may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other restrictions. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0027] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps of the specific order described. As will be understood by those of ordinary skill in the art, other sequences of steps are also possible. Therefore, the specific sequence of the steps set forth in the specification should not be interpreted as a limitation to the claims. In addition, the claims for the method and / or process should not be limited to the steps of performing them in the order written, and those skilled in the art can easily understand that these sequences can be changed and still remain within the spirit and scope of the embodiments of the present application.

[0028] like Figure 1 As shown, the embodiment of the present disclosure provides a vehicle-mounted device, including: a vehicle-mounted host 10, a first control group 20 and a second control group 30; the first control group 20 includes: a first wireless control module 201, a first radio adapter module 203 and a first radio 205; the second control group 30 includes: a second wireless control module 301, a second radio adapter module 303 and a second radio 305;

[0029] The vehicle-mounted host is configured to determine a target ground device to be connected, select one from the first radio adapter module and the second radio adapter module as a target radio adapter module, and send a connection establishment request to the target radio adapter module through a wireless control module in the same group as the target radio adapter module, wherein the connection establishment request carries the IP address information of the target ground device;

[0030] The first radio station adaptation module is configured to establish a first packet domain wireless connection based on an IP address of the target ground device through the first radio station if a connection establishment request is received, and to establish a second packet domain wireless connection based on another IP address of the target ground device through the second radio station;

[0031] The second radio adapter module is configured to establish a first packet domain wireless connection through the first radio based on an IP address of the target ground device if a connection establishment request is received, and to establish a second packet domain wireless connection through the second radio based on another IP address of the target ground device.

[0032] The vehicle-mounted device provided in the embodiment of the present application, the vehicle-mounted host determines the target ground device to be connected, selects one from the first radio adapter module and the second radio adapter module as the target radio adapter module, and sends a connection establishment request to the target radio adapter module through the wireless control module in the same group as the target radio adapter module, and the connection establishment request carries the IP address information of the target ground device; if any one of the first radio adapter module and the second radio adapter module receives the connection establishment request, a first packet domain wireless connection is established through the first radio based on an IP address of the target ground device, and a second packet domain wireless connection is established through the second radio based on another IP address of the target ground device. The vehicle-mounted device of the embodiment of the present application communicates wirelessly with the ground device through a dual link, reducing the risk of communication timeout in the vehicle-to-ground wireless communication.

[0033] In an exemplary embodiment, the vehicle host is further configured to send a mode control signal to the radio adapter module through a wireless control module in the same group as the radio adapter module to control the radio adapter module to connect or disconnect the transmission channel with the radio.

[0034] In an exemplary embodiment, the mode control signal is used to indicate any one of the following four operations: disconnecting the transmission channel between the radio station adapter module and the radio station in the same group, connecting the transmission channel between the radio station adapter module and the radio station in the same group, disconnecting the transmission channel between the radio station adapter module and the radio station in another control group, and connecting the transmission channel between the radio station adapter module and the radio station in another control group.

[0035] The mode control signal can adopt the structure of a primitive, and its primitive name is T-CTRLMT, including a 1-byte operation parameter. The operation parameter can have four values, namely the first parameter value, the second parameter value, the third parameter value and the fourth parameter value. The operation parameter is the first parameter value used to indicate the disconnection of the transmission channel between the radio adapter module and the radio in the same group, the operation parameter is the second parameter value used to indicate the connection of the transmission channel between the radio adapter module and the radio in the same group, the operation parameter is the third parameter value used to indicate the disconnection of the transmission channel between the radio adapter module and the radio in another control group, and the operation parameter is the fourth parameter value used to indicate the connection of the transmission channel between the radio adapter module and the radio in another control group. By designing the control primitives of the vehicle-mounted host and the radio adapter module, the connection and disconnection of the transmission channel between the radio adapter module and the radio can be correctly controlled.

[0036] In an exemplary embodiment, the vehicle-mounted host is also configured to, after the vehicle-mounted device and the ground device have established a packet domain wireless connection, use the radio station adaptation module connected to the ground device as a working radio station adaptation module, and use another radio station adaptation module as an idle radio station adaptation module; when the working radio station adaptation module or the wireless control module in the same group as the working radio station adaptation module fails, two mode control signals are sent to the idle radio station adaptation module through the wireless control module in the same group as the idle radio station adaptation module, wherein one mode control signal is used to instruct the idle radio station adaptation module to connect the transmission channel between the current radio station adaptation module and a radio station in the same group, and the other mode control signal is used to instruct the idle radio station adaptation module to connect the transmission channel between the current radio station adaptation module and a radio station in another control group.

[0037] By setting the relay module to be controlled by the combination of the radio adapter modules of the two control groups, the connection switching between the two radio adapter modules and the radio is very convenient, and when one control group fails, the other control group can take over the control of the radio in time, thereby reducing the risk of communication timeout in the vehicle-to-ground wireless communication.

[0038] In an exemplary embodiment, the first control group further includes a first relay module, and the second control group further includes a second relay module;

[0039] The first radio adapter module is further configured to send a first switch control signal to the first relay module and a second switch control signal to the second relay module;

[0040] The second radio adapter module is further configured to send a third switch control signal to the first relay module and a fourth switch control signal to the second relay module;

[0041] The first relay module is configured to select one of the first radio adapter module and the second radio adapter module as a connection object under the action of the first switch control signal of the first radio adapter module and the third switch control signal of the second radio adapter module, and connect the transmission channel between the connection object and the first radio station;

[0042] The second relay module is configured to select one of the first radio adapter module and the second radio adapter module as a connection object under the action of the second switch control signal of the first radio adapter module and the fourth switch control signal of the second radio adapter module, and connect the transmission channel between the connection object and the second radio.

[0043] In an exemplary embodiment, the first relay module is configured to use the first radio adapter module as a connection object when the first switch control signal is a valid signal and the third switch control signal is an invalid signal; and use the second radio adapter module as a connection object when the third switch control signal is a valid signal and the first switch control signal is an invalid signal;

[0044] The second relay module is configured to use the first radio adapter module as a connection object when the second switch control signal is a valid signal and the fourth switch control signal is an invalid signal; and to use the second radio adapter module as a connection object when the fourth switch control signal is a valid signal and the second switch control signal is an invalid signal.

[0045] In an exemplary embodiment, the first relay module is further configured to keep the previous connection object unchanged when the first switch control signal and the third switch control signal are both valid signals or both invalid signals;

[0046] The second relay module is further configured to keep the previous connection object unchanged when the second switch control signal and the fourth switch control signal are both valid signals or both invalid signals.

[0047] Table 1 shows the correspondence between the switch control signals of the first and second radio adapter modules and the connection object of the first relay module. The first radio adapter module sends a first switch control signal to the first relay module, and the second radio adapter module sends a third switch control signal to the first relay module.

[0048] The first switch control signal The third switch control signal Connection Object efficient invalid First radio adapter module invalid efficient Second station adapter module efficient efficient Keep it the same invalid invalid Keep it the same

[0049] Table 1

[0050] Table 2 shows the correspondence between the switch control signals of the first and second radio adapter modules and the connection object of the second relay module. The first radio adapter module sends the second switch control signal to the second relay module, and the second radio adapter module sends the fourth switch control signal to the second relay module.

[0051] The second switch control signal The fourth switch control signal Connection Object efficient invalid First radio adapter module invalid efficient Second station adapter module efficient efficient Keep it the same invalid invalid Keep it the same

[0052] Table 2

[0053] When the switch control signals of the first radio adapter module and the second radio adapter module are valid or invalid at the same time, the previous connection object of the relay module is kept unchanged, which can ensure that the radio is connected to at least one radio adapter module at any time, improve the reliability of communication between the vehicle-mounted host and the radio, and prevent communication interruption between the vehicle-mounted host and the radio due to faults and other reasons.

[0054] The introduction of the relay module enables one radio adapter module to control two radios, and avoids control conflicts and realizes redundant channels through the coordination of control signals of the two radio adapter modules.

[0055] Figure 2 FIG. 1 shows a schematic diagram of a radio adapter module connected to a radio via a relay module. In an exemplary embodiment, Figure 2 As shown, the first control group 20 further includes a first relay module 207, and the second control group 30 further includes a second relay module 307;

[0056] The first relay module 207 includes a first input port group, a first control port C1, a second input port group, a second control port C2, a switch and an output port group; the first input port group includes n input ports D_11 to D_1n, the second input port group includes n input ports D_21 to D_2n, and the output port group includes n output ports O_1 to O_n;

[0057] The n input ports D_11 to D_1n in the first input port group of the first relay module are connected to the n output ports D_11 to D_1n in the first output port group of the first radio adapter module 203 in a one-to-one correspondence; the first control port C1 of the first relay module is connected to the first control port C1 of the first radio adapter module; the n input ports D_21 to D_2n in the second input port group of the first relay module are connected to the n output ports D_21 to D_2n in the second output port group of the second radio adapter module 303 in a one-to-one correspondence; the second control port C2 of the first relay module is connected to the second control port C2 of the second radio adapter module;

[0058] The switch of the first relay module is used to select a group from the first input port group and the second input port group as the target input port group under the action of the first switch control signal input to the first control port C1 of the first relay module and the third switch control signal input to the second control port C2, and connect the n input ports in the target input port group with the n output ports of the output port group of the second relay module in a one-to-one correspondence; the n output ports of the output port group of the first relay module are also connected in a one-to-one correspondence with the n input ports D_1 to D_n of the first radio station 205;

[0059] The second relay module 307 includes a first input port group, a first control port C1, a second input port group, a second control port C2, a switch and an output port group; the first input port group includes n input ports D_11 to D_1n, the second input port group includes n input ports D_21 to D_2n, and the output port group includes n output ports O_1 to O_n;

[0060] The n input ports D_11 to D_1n in the first input port group of the second relay module are connected to the n output ports D_11 to D_1n in the first output port group of the second radio adapter module 303 in a one-to-one correspondence; the first control port C1 of the second relay module is connected to the first control port C1 of the second radio adapter module; the n input ports D_21 to D_2n in the second input port group of the second relay module are connected to the n output ports D_21 to D_2n in the second output port group of the first radio adapter module 203 in a one-to-one correspondence; the second control port C2 of the second relay module is connected to the second control port C2 of the first radio adapter module;

[0061] The switch of the second relay module is used to select a group from the first input port group and the second input port group as the target input port group under the action of the second switch control signal input by the first control port C1 of the second relay module and the fourth switch control signal input by the second control port C2, and connect the n input ports in the target input port group with the n output ports of the output port group of the second relay module in a one-to-one correspondence; the n output ports of the output port group of the second relay module are also connected in a one-to-one correspondence with the n input ports D_1 to D_n of the second radio station 305.

[0062] In an exemplary embodiment, the transmission channel between the radio station adaptation module and the radio station includes a transmission link for a set of interface signals related to data communication and signal control;

[0063] The interface signals include: sending data, receiving data, vehicle host ready and data channel receiving link detection.

[0064] In an exemplary embodiment, the transmission channel between the radio adapter module and the radio complies with the definition of the IGSM-R interface in the "TB-T3382-2016 CTCS-3 Level Train Operation Control System and Railway Digital Mobile Communication System (GSM-R) Interface Specification", including 4 interfaces related to data communication and signal control: send data CT103, receive data CT104, data terminal (on-board host) ready CT108 and data channel receive link detection CT109.

[0065] In an exemplary embodiment, the transmission channel between the first radio adapter module and the first radio station, the transmission channel between the first radio adapter module and the second radio station, the transmission channel between the second radio adapter module and the first radio station, and the transmission channel between the second radio adapter module and the second radio station include the same interface signals.

[0066] In an exemplary embodiment, the packet domain wireless connection is based on a 5G-R (a new generation of railway mobile communication system based on 5G technology) network.

[0067] Figure 3 A schematic diagram of a hierarchical structure of a packet domain wireless connection based on a 5G-R network is shown.

[0068] In an exemplary embodiment, Figure 3 As shown, the packet domain wireless connection is a connection established on multiple protocol layers;

[0069] Among them, the multiple protocol layers are, from bottom to top, physical layer, data link layer, network layer, transport layer, redundancy layer, security layer and application layer. The redundancy layer can adopt the ALE (Adaptation & redundancy management Layer Entity) protocol, the transport layer can adopt the TCP (Transmission Control Protocol) protocol, the network layer can adopt the IP (Internet Protocol) protocol, the data link layer can adopt the PPP (Point to Point Protocol) protocol, and the physical layer can adopt the 5G-R protocol.

[0070] In an exemplary embodiment, Figure 3 As shown, the vehicle-mounted host is responsible for processing the protocol of the application layer; the first wireless control module and the second wireless control module are responsible for processing the protocol of the security layer; the first radio station adapter module and the second radio station adapter module are responsible for processing the protocols of the redundancy layer, the transport layer, the network layer, and the data link layer; the first radio station and the second radio station are responsible for processing the protocol of the physical layer.

[0071] In an exemplary embodiment, Figure 3 As shown, the two packet domain wireless connections between the vehicle-mounted device and the target ground device are managed by a redundant layer session, a security layer session, and an application layer session above the transport layer. By managing the two packet domain wireless connections between the vehicle-mounted device and the target ground device through a redundant layer session, the security layer and the application layer can be unaware of the redundant transmission links. As long as the transport layer link of at least one packet domain wireless connection is successfully established, the redundant layer session is successfully established.

[0072] In an exemplary embodiment, a timeout timer is started when a redundant layer session is established between the vehicle-mounted device and the target ground device. If the vehicle-mounted device and the target ground device successfully establish at least one transport layer connection when the timeout timer expires, it is determined that the redundant layer session is successfully established; if the vehicle-mounted device and the target ground device do not successfully establish any transport layer connection when the timeout timer expires, it is determined that the redundant layer session has failed to be established, the timeout timer is restarted, the IP addresses of the packet domain wireless connection to be established by the first and second radio stations are exchanged, and the two transport layer connections between the vehicle-mounted device and the target device are reestablished. A timeout timer is established at the redundant layer. When the timer expires, the two radio stations exchange IPs to establish a connection. This can avoid the inability of the vehicle-mounted device and the ground device to establish a connection due to a cross-device failure, and increase the probability of successfully establishing a packet domain wireless connection.

[0073] The ALE protocol establishes two transmission links between ALE entities. All data can be transmitted on two TCP connections and the same transmission sequence number is used on the two transmission links. At the data receiving end of the ALE protocol, if the transmission sequence number of the data received this time is equal to the transmission sequence number of the last received data plus 1, the data received this time is transmitted to the security layer. If the transmission sequence number of the data received this time is not equal to the transmission sequence number of the last received data plus 1, the data received this time is discarded. The services of the ALE protocol include transmitting data on other links when a transmission link connection fails, and attempting to rebuild the connection of any failed transmission link.

[0074] In an exemplary embodiment, the vehicle-mounted host is further configured to control the two radio adapter modules to connect the transmission channels with the radio stations in the same group during the initialization process of the vehicle-mounted device.

[0075] In an exemplary embodiment, the vehicle host is further configured to control the two radio adapter modules to connect the transmission channel between the radio stations in the same group and disconnect the transmission channel between the radio stations in another control group when the vehicle device is in an idle state; wherein the idle state is a state in which the vehicle device has not established a connection with any ground device. In the idle state, the connection relationship between the radio adapter module and the radio station automatically returns to the initialization state: the first radio adapter module is connected to the first radio station, and the second radio adapter module is connected to the second radio station.

[0076] In an exemplary embodiment, the vehicle-mounted host is configured to, after determining the target ground device to be connected, use one radio station adapter module as the target radio station adapter module, use another radio station adapter module as the idle radio station adapter module, use the radio station in the same group as the target radio station adapter module as the first target radio station, and use the radio station in the same group as the idle radio station adapter module as the second target radio station; send a mode control signal to the idle radio station adapter module through the wireless control module in the same group as the idle radio station adapter module to instruct to disconnect the transmission channel between the idle radio station adapter module and the second target radio station;

[0077] The target radio adapter module is configured to establish a first packet domain wireless connection through the first target radio based on an IP address of the target ground device after receiving a connection establishment request, connect the target radio adapter module with the transmission channel of the second target radio, and establish a second packet domain wireless connection through the second target radio based on another IP address of the target ground device.

[0078] In an exemplary embodiment, the vehicle-mounted host is further configured to, when it wants to disconnect a connected ground device, take the ground device as the target ground device, take the radio adapter module that establishes a connection with the target ground device as the working radio adapter module, and take another radio adapter module as the idle radio adapter module; take the radio in the same group as the working radio adapter module as the first working radio, and take the radio in the same group as the idle radio adapter module as the second working radio; send a connection disconnection request to the working radio adapter module through the wireless control module in the same group as the working radio adapter module, the connection disconnection request carries the IP address information of the target ground device; if a connection disconnection response returned by the working radio adapter module is received, send a mode control signal to the idle radio adapter module through the wireless control module in the same group as the idle radio adapter module to indicate to connect the transmission channel between the idle radio adapter module and the second working radio;

[0079] The working radio adapter module is configured to disconnect the two packet domain wireless connections between the vehicle-mounted device and the target ground device after receiving the connection disconnection request; if there is no packet domain wireless connection with other ground devices at present, the connection state of the transmission channel between the working radio adapter module and the first working radio station is maintained unchanged, and the transmission channel between the working radio adapter module and the second working radio station is disconnected; and a connection disconnection response is returned to the vehicle-mounted host;

[0080] The idle station adapter module is configured to connect the transmission channel between the idle station adapter module and the second working station upon receiving the mode control signal.

[0081] In an exemplary embodiment, the vehicle-mounted host is further configured to, when the distance between the vehicle-mounted device and the handover point is less than a threshold value, use the radio adapter module that establishes a connection with the supervisory ground device as a working radio adapter module, and use another radio adapter module as an idle radio adapter module; use the radio in the same group as the working radio adapter module as the first working radio, and use the radio in the same group as the idle radio adapter module as the second working radio; send a connection establishment request to the working radio adapter module through the wireless control module in the same group as the working radio adapter module, and the connection establishment request carries the IP address information of the next ground device; when the vehicle-mounted device runs to the handover point, send a connection disconnection request to the working radio adapter module through the wireless control module in the same group as the working radio adapter module, and the connection disconnection request carries the IP address information of the supervisory ground device; wherein the ground device that hands over the rights at the handover point is the supervisory ground device;

[0082] The working radio adapter module is configured to, after receiving a connection establishment request, establish two new packet domain wireless connections between the vehicle-mounted device and the next ground device through the first working radio and the second working radio; after receiving a connection disconnection request, disconnect the two packet domain wireless connections between the vehicle-mounted device and the supervisory ground device.

[0083] like Figure 4 As shown, the embodiment of the present disclosure provides a communication method of a vehicle-mounted device, including:

[0084] Step S10, the vehicle host determines the target ground device to be connected, selects one from the first radio adapter module and the second radio adapter module as the target radio adapter module, and sends a connection establishment request to the target radio adapter module through the wireless control module in the same group as the target radio adapter module, wherein the connection establishment request carries the IP address information of the target ground device;

[0085] Step S20, after receiving the connection establishment request, the target radio station adaptation module establishes a first packet domain wireless connection based on an IP address of the target ground device through a first radio station, and establishes a second packet domain wireless connection based on another IP address of the target ground device through a second radio station;

[0086] Among them, the vehicle-mounted equipment includes a vehicle-mounted host, a first control group and a second control group; the first control group includes: a first wireless control module, a first radio adapter module and a first radio; the second control group includes: a second wireless control module, a second radio adapter module and a second radio.

[0087] The communication method of the vehicle-mounted device provided in the embodiment of the present application is that the vehicle-mounted host determines the target ground device to be connected, selects one from the first radio adapter module and the second radio adapter module as the target radio adapter module, and sends a connection establishment request to the target radio adapter module through the wireless control module in the same group as the target radio adapter module, and the connection establishment request carries the IP address information of the target ground device; after the target radio adapter module receives the connection establishment request, the first packet domain wireless connection is established through the first radio based on an IP address of the target ground device, and the second packet domain wireless connection is established through the second radio based on another IP address of the target ground device. The vehicle-mounted device of the embodiment of the present application communicates wirelessly with the ground device through a dual link, reducing the risk of communication timeout in the vehicle-to-ground wireless communication.

[0088] In an exemplary embodiment, the method further includes: during the initialization process of the vehicle-mounted device, the vehicle-mounted host controls the two radio adapter modules to connect the transmission channels with the radio stations in the same group.

[0089] In an exemplary embodiment, the method also includes: when the vehicle-mounted device is in an idle state, the vehicle-mounted host controls the two radio adapter modules to connect the transmission channel between the radio stations in the same group and disconnect the transmission channel between the radio stations in another control group; wherein the idle state is a state in which the vehicle-mounted device has not established a connection with any ground device.

[0090] In an exemplary embodiment, the transmission channel between the radio station adaptation module and the radio station includes a transmission link for a set of interface signals related to data communication and signal control;

[0091] The interface signals include: sending data, receiving data, vehicle host ready and data channel receiving link detection.

[0092] In an exemplary embodiment, the transmission channel between the first radio adapter module and the first radio station, the transmission channel between the first radio adapter module and the second radio station, the transmission channel between the second radio adapter module and the first radio station, and the transmission channel between the second radio adapter module and the second radio station include the same interface signals.

[0093] In an exemplary embodiment, the method further comprises:

[0094] The vehicle-mounted host is also configured to send a mode control signal to the radio adapter module through a wireless control module in the same group as the radio adapter module to control the radio adapter module to connect or disconnect the transmission channel with the radio.

[0095] In an exemplary embodiment, the mode control signal is used to indicate any one of the following four operations: disconnecting the transmission channel between the radio station adapter module and the radio station in the same group, connecting the transmission channel between the radio station adapter module and the radio station in the same group, disconnecting the transmission channel between the radio station adapter module and the radio station in another control group, and connecting the transmission channel between the radio station adapter module and the radio station in another control group.

[0096] In an exemplary embodiment, the packet domain wireless connection is based on a 5G-R (a new generation of railway mobile communication system based on 5G technology) network.

[0097] In an exemplary embodiment, the packet domain wireless connection is a connection established on multiple protocol layers;

[0098] The multiple protocol layers are, from bottom to top, physical layer, data link layer, network layer, transport layer, redundancy layer, security layer and application layer.

[0099] In an exemplary embodiment, the vehicle-mounted host is responsible for processing the protocol of the application layer; the first wireless control module and the second wireless control module are responsible for processing the protocol of the security layer; the first radio station adapter module and the second radio station adapter module are responsible for processing the protocols of the redundancy layer, transport layer, network layer, and data link layer; the first radio station and the second radio station are responsible for processing the protocol of the physical layer.

[0100] In an exemplary embodiment, the two packet domain wireless connections between the vehicle-mounted device and the target ground device are managed above the transport layer by a redundancy layer session, a security layer session, and an application layer session.

[0101] In an exemplary embodiment, after the vehicle-mounted host determines the target ground device to be connected, the method further includes:

[0102] The vehicle-mounted host uses one radio adapter module as a target radio adapter module, uses another radio adapter module as an idle radio adapter module, uses a radio in the same group as the target radio adapter module as a first target radio, and uses a radio in the same group as the idle radio adapter module as a second target radio; sends a mode control signal to the idle radio adapter module through a wireless control module in the same group as the idle radio adapter module to instruct to disconnect the transmission channel between the idle radio adapter module and the second target radio;

[0103] After the target radio station adapter module receives the connection establishment request, it establishes a first packet domain wireless connection through the first target radio station based on an IP address of the target ground device, connects the target radio station adapter module with the transmission channel of the second target radio station, and establishes a second packet domain wireless connection through the second target radio station based on another IP address of the target ground device.

[0104] Figure 5 A signal interaction diagram for establishing a connection between an onboard device and a ground device is shown. Figure 5 As shown, assuming that the target radio station adapter module is the first radio station adapter module, the second radio station adapter module is the idle radio station adapter module, the first radio station is the first target radio station, and the second radio station is the second target radio station. Establishing a connection between the vehicle host and the ground device may include the following steps:

[0105] S101, the vehicle-mounted host sends a connection establishment request (T-CONN.req primitive) to the first radio adapter module through the first wireless control module, and the connection establishment request carries the IP address information of the ground device.

[0106] S102, the vehicle host sends a mode control signal (T-CTRLMT primitive, in which the operation parameter carried takes the first parameter value) to the second radio adapter module through the second wireless control module to instruct to disconnect the transmission channel between the radio adapter module and the radio in the same group;

[0107] S103, the second station adapter module receives the mode control signal and disconnects the transmission channel between the second station adapter module and the second station;

[0108] S104, the first radio station adapter module receives the connection establishment request, uses the first radio station to establish a packet domain wireless connection with the first communication interface unit of the ground device (based on the first IP address), the first radio station adapter module connects the transmission channel with the second radio station, and uses the second radio station to establish a packet domain wireless connection with the second communication interface unit of the ground device (based on the second IP address);

[0109] S105, the first radio adapter module returns a connection establishment response (T-CONN.ind primitive) to the vehicle-mounted host.

[0110] In an exemplary embodiment, the method further comprises:

[0111] When the vehicle-mounted host wants to disconnect a connected ground device, the ground device is taken as the target ground device, the radio adapter module that establishes a connection with the target ground device is taken as the working radio adapter module, and another radio adapter module is taken as the idle radio adapter module; the radio in the same group as the working radio adapter module is taken as the first working radio, and the radio in the same group as the idle radio adapter module is taken as the second working radio; a connection disconnection request is sent to the working radio adapter module through the wireless control module in the same group as the working radio adapter module, and the connection disconnection request carries the IP address information of the target ground device;

[0112] After receiving the disconnection request, the working radio adapter module disconnects the two packet domain wireless connections between the vehicle-mounted device and the target ground device; if there is no packet domain wireless connection with other ground devices at present, the connection state of the transmission channel between the working radio adapter module and the first working radio station is maintained unchanged, and the transmission channel between the working radio adapter module and the second working radio station is disconnected; and a disconnection response is returned to the vehicle-mounted host;

[0113] If the vehicle-mounted host receives a connection disconnection response returned by the working radio station adapter module, a mode control signal is sent to the idle radio station adapter module through the wireless control module in the same group as the idle radio station adapter module to indicate the connection of the transmission channel between the idle radio station adapter module and the second working radio station; the idle radio station adapter module receives the mode control signal and connects the transmission channel between the idle radio station adapter module and the second working radio station.

[0114] Figure 6 A signal interaction diagram showing a disconnection between an onboard device and a ground device is shown. Figure 6 As shown, assuming that the working radio adapter module is the first radio adapter module, the second radio adapter module is the idle radio adapter module, the first radio is the first working radio, and the second radio is the second working radio. Disconnecting the vehicle-mounted host from the ground device may include the following steps:

[0115] S101, the vehicle-mounted host sends a disconnection request (T-DISC.req primitive) to the first radio adapter module through the first wireless control module, and the disconnection request carries the IP address information of the ground device.

[0116] S102, the first radio adapter module receives the connection disconnection request, and disconnects the two packet domain wireless connections between the vehicle-mounted device and the ground device; if there is no packet domain wireless connection of other ground devices at present, the connection state of the transmission channel between the first radio adapter module and the first radio station is kept unchanged, the transmission channel between the first radio adapter module and the second radio station is disconnected, and a connection disconnection response (T-DISC.ind primitive) is returned to the vehicle-mounted host;

[0117] S103, if the vehicle host receives a disconnection response, it sends a mode control signal (T-CTRLMT primitive, in which the operation parameter carried takes the second parameter value) to the second radio adapter module through the second wireless control module to indicate the transmission channel connecting the radio adapter module and the radio in the same group;

[0118] S104: The second station adapter module receives the mode control signal and connects a transmission channel between the second station adapter module and the second station.

[0119] In an exemplary embodiment, the method further comprises:

[0120] When the distance between the vehicle-mounted device and the intersection point is less than a threshold value, the vehicle-mounted host uses the radio adapter module that establishes a connection with the supervised ground device as a working radio adapter module, and another radio adapter module as an idle radio adapter module; uses the radio in the same group as the working radio adapter module as the first working radio, and uses the radio in the same group as the idle radio adapter module as the second working radio; sends a connection establishment request to the working radio adapter module through the wireless control module in the same group as the working radio adapter module, and the connection establishment request carries the IP address information of the next ground device;

[0121] After receiving the connection establishment request, the working radio station adaptation module establishes two packet domain wireless connections between the vehicle-mounted device and the next ground device through the first working radio station and the second working radio station;

[0122] When the vehicle-mounted device runs to the handover point, the vehicle-mounted host sends a connection disconnection request to the working radio adapter module through the wireless control module of the same group as the working radio adapter module, and the connection disconnection request carries the IP address information of the supervising ground device; wherein the ground device that hands over the rights at the handover point is the supervising ground device;

[0123] After receiving the disconnection request, the working radio station adapter module disconnects the two packet domain wireless connections between the vehicle-mounted device and the supervisory ground device.

[0124] like Figure 7As shown, the embodiment of the present disclosure provides a train control vehicle-ground wireless communication system, including: an on-board device 1, a wireless communication network 2 and a ground device 3; the ground device 3 includes: a first communication interface unit 31, a second communication interface unit 32 and a ground host 33; the first communication interface unit is configured with an IP address, and the second communication interface unit is configured with another IP address; the on-board device 1 includes: an on-board host 10, a first control group 20 and a second control group 30; the first control group 20 includes: a first wireless control module 201, a first radio adapter module 203 and a first radio 205; the second control group 30 includes: a second wireless control module 301, a second radio adapter module 303 and a second radio 305;

[0125] The vehicle-mounted host is configured to determine a target ground device to be connected, select one from the first radio adapter module and the second radio adapter module as a target radio adapter module, and send a connection establishment request to the target radio adapter module through a wireless control module in the same group as the target radio adapter module, wherein the connection establishment request carries the IP address information of the target ground device;

[0126] The first radio station adaptation module is configured to establish a first packet domain wireless connection based on an IP address of the target ground device through the first radio station if a connection establishment request is received, and to establish a second packet domain wireless connection based on another IP address of the target ground device through the second radio station;

[0127] The second radio station adaptation module is configured to establish a first packet domain wireless connection based on an IP address of the target ground device through the first radio station if a connection establishment request is received, and establish a second packet domain wireless connection based on another IP address of the target ground device through the second radio station;

[0128] The ground host is configured to establish a first packet domain wireless connection with the vehicle-mounted device through a first communication interface unit, and to establish a second packet domain wireless connection with the vehicle-mounted device through a second communication interface unit.

[0129] In the train control vehicle-to-ground wireless communication system provided in the embodiment of the present application, the vehicle-mounted host determines the target ground device to be connected, selects one from the first radio adapter module and the second radio adapter module as the target radio adapter module, and sends a connection establishment request to the target radio adapter module through the wireless control module in the same group as the target radio adapter module, and the connection establishment request carries the IP address information of the target ground device; if any one of the first radio adapter module and the second radio adapter module receives the connection establishment request, a first packet domain wireless connection is established through the first radio based on an IP address of the target ground device, and a second packet domain wireless connection is established through the second radio based on another IP address of the target ground device. The vehicle-mounted device in the embodiment of the present application wirelessly communicates with the ground device through a dual link, reducing the risk of communication timeout in the vehicle-to-ground wireless communication.

[0130] In an exemplary embodiment, the wireless communication network includes a 5G-R (a new generation of railway mobile communication system based on 5G technology) network.

[0131] The characteristics of the on-board equipment in the train control vehicle-to-ground wireless communication system are as described above and will not be repeated here.

[0132] In the above-mentioned train control vehicle-ground wireless communication system, the wireless data transmission between the vehicle-mounted equipment and the ground equipment adopts a redundant dual-channel connection. When any one of the communication interface modules of the wireless control module, radio adapter module, radio or ground equipment in any group fails, the application layer connection between the vehicle-mounted equipment and the ground equipment can still be maintained, thereby greatly reducing the wireless communication timeout problem caused by a single device failure during train operation and improving the reliability of vehicle-ground wireless communication. In addition, when the vehicle-mounted equipment switches from the supervised ground equipment to the next ground equipment, the present application is that the vehicle-mounted equipment first establishes a connection with the next ground equipment, and then disconnects from the original supervised ground equipment. Therefore, even if there is a transmission layer connection failure, it will not cause the handover of the ground equipment to fail, thereby reducing the wireless communication timeout problem caused by equipment failure when the vehicle-mounted equipment switches to the ground equipment, and improving the reliability of vehicle-ground wireless communication.

[0133] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

Claims

1. A vehicle-mounted device, comprising: A vehicle-mounted host, a first control group, and a second control group; The first control group includes: a first wireless control module, a first radio adapter module and a first radio station; the second control group includes: a second wireless control module, a second radio adapter module and a second radio station; The vehicle-mounted host is configured to determine a target ground device to be connected, select one from the first radio adapter module and the second radio adapter module as a target radio adapter module, and send a connection establishment request to the target radio adapter module through a wireless control module in the same group as the target radio adapter module, wherein the connection establishment request carries the IP address information of the target ground device; The first radio station adaptation module is configured to establish a first packet domain wireless connection based on an IP address of the target ground device through the first radio station if a connection establishment request is received, and to establish a second packet domain wireless connection based on another IP address of the target ground device through the second radio station; The second radio adapter module is configured to establish a first packet domain wireless connection through the first radio based on an IP address of the target ground device if a connection establishment request is received, and to establish a second packet domain wireless connection through the second radio based on another IP address of the target ground device.

2. The vehicle-mounted device according to claim 1, characterized in that: The vehicle-mounted host is also configured to send a mode control signal to the radio adapter module through a wireless control module in the same group as the radio adapter module to control the radio adapter module to connect or disconnect the transmission channel with the radio.

3. The vehicle-mounted device according to claim 2, characterized in that: The mode control signal is used to indicate any one of the following four operations: disconnecting the transmission channel between the radio station adapter module and the radio station in the same group, connecting the transmission channel between the radio station adapter module and the radio station in the same group, disconnecting the transmission channel between the radio station adapter module and the radio station in another control group, and connecting the transmission channel between the radio station adapter module and the radio station in another control group.

4. The vehicle-mounted device according to claim 2, characterized in that: The first control group further includes a first relay module, and the second control group further includes a second relay module; The first radio adapter module is further configured to send a first switch control signal to the first relay module and a second switch control signal to the second relay module; The second radio adapter module is further configured to send a third switch control signal to the first relay module and a fourth switch control signal to the second relay module; The first relay module is configured to select one of the first radio adapter module and the second radio adapter module as a connection object under the action of the first switch control signal of the first radio adapter module and the third switch control signal of the second radio adapter module, and connect the transmission channel between the connection object and the first radio station; The second relay module is configured to select one of the first radio adapter module and the second radio adapter module as a connection object under the action of the second switch control signal of the first radio adapter module and the fourth switch control signal of the second radio adapter module, and connect the transmission channel between the connection object and the second radio.

5. The vehicle-mounted device according to claim 4, characterized in that: The first relay module is configured to use the first radio adapter module as a connection object when the first switch control signal is a valid signal and the third switch control signal is an invalid signal; use the second radio adapter module as a connection object when the third switch control signal is a valid signal and the first switch control signal is an invalid signal; and keep the previous connection object unchanged when the first switch control signal and the third switch control signal are both valid signals or both are invalid signals; The second relay module is configured to use the first radio adapter module as a connection object when the second switch control signal is a valid signal and the fourth switch control signal is an invalid signal; use the second radio adapter module as a connection object when the fourth switch control signal is a valid signal and the second switch control signal is an invalid signal; and keep the previous connection object unchanged when the second switch control signal and the fourth switch control signal are both valid signals or both are invalid signals.

6. The vehicle-mounted device according to claim 1, characterized in that: The packet domain wireless connection is a connection established on multiple protocol layers; wherein the multiple protocol layers are, from bottom to top, physical layer, data link layer, network layer, transport layer, redundancy layer, security layer and application layer; The vehicle-mounted host is responsible for processing the protocol of the application layer; the first wireless control module and the second wireless control module are responsible for processing the protocol of the security layer; the first radio station adapter module and the second radio station adapter module are responsible for processing the protocols of the redundancy layer, the transport layer, the network layer, and the data link layer; the first radio station and the second radio station are responsible for processing the protocol of the physical layer.

7. The vehicle-mounted device according to claim 2, characterized in that: The vehicle-mounted host is also configured to control the two radio adapter modules to connect the transmission channel with the radio stations in the same group during the initialization process of the vehicle-mounted equipment; when the vehicle-mounted equipment is in an idle state, control the two radio adapter modules to connect the transmission channel with the radio stations in the same group and disconnect the transmission channel with the radio stations in another control group; wherein the idle state is a state in which the vehicle-mounted equipment has not established a connection with any ground equipment.

8. The vehicle-mounted device according to claim 2, characterized in that: The vehicle-mounted host is configured to, after determining the target ground device to be connected, use one radio adapter module as the target radio adapter module, use another radio adapter module as the idle radio adapter module, use the radio in the same group as the target radio adapter module as the first target radio, and use the radio in the same group as the idle radio adapter module as the second target radio; send a mode control signal to the idle radio adapter module through the wireless control module in the same group as the idle radio adapter module to instruct to disconnect the transmission channel between the idle radio adapter module and the second target radio; The target radio adapter module is configured to establish a first packet domain wireless connection through the first target radio based on an IP address of the target ground device after receiving a connection establishment request, connect the target radio adapter module with the transmission channel of the second target radio, and establish a second packet domain wireless connection through the second target radio based on another IP address of the target ground device.

9. The vehicle-mounted device according to claim 2, characterized in that: The vehicle-mounted host is also configured to, when it wants to disconnect a connected ground device, take the ground device as the target ground device, take the radio adapter module that establishes a connection with the target ground device as the working radio adapter module, and take another radio adapter module as the idle radio adapter module; take the radio in the same group as the working radio adapter module as the first working radio, and take the radio in the same group as the idle radio adapter module as the second working radio; send a connection disconnection request to the working radio adapter module through the wireless control module in the same group as the working radio adapter module, the connection disconnection request carries the IP address information of the target ground device; if a connection disconnection response returned by the working radio adapter module is received, send a mode control signal to the idle radio adapter module through the wireless control module in the same group as the idle radio adapter module to indicate to connect the transmission channel between the idle radio adapter module and the second working radio; The working radio adapter module is configured to disconnect the two packet domain wireless connections between the vehicle-mounted device and the target ground device after receiving the connection disconnection request; if there is no packet domain wireless connection with other ground devices at present, the connection state of the transmission channel between the working radio adapter module and the first working radio station is maintained unchanged, and the transmission channel between the working radio adapter module and the second working radio station is disconnected; and a connection disconnection response is returned to the vehicle-mounted host; The idle station adapter module is configured to connect the transmission channel between the idle station adapter module and the second working station upon receiving the mode control signal.

10. The vehicle-mounted device according to claim 2, characterized in that: The vehicle-mounted host is also configured to, when the distance between the vehicle-mounted device and the handover point is less than a threshold, use the radio adapter module that establishes a connection with the supervisory ground device as a working radio adapter module, and use another radio adapter module as an idle radio adapter module; use the radio in the same group as the working radio adapter module as the first working radio, and use the radio in the same group as the idle radio adapter module as the second working radio; send a connection establishment request to the working radio adapter module through the wireless control module in the same group as the working radio adapter module, and the connection establishment request carries the IP address information of the next ground device; when the vehicle-mounted device runs to the handover point, send a connection disconnection request to the working radio adapter module through the wireless control module in the same group as the working radio adapter module, and the connection disconnection request carries the IP address information of the supervisory ground device; wherein the ground device that hands over the rights at the handover point is the supervisory ground device; The working radio adapter module is configured to, after receiving a connection establishment request, establish two new packet domain wireless connections between the vehicle-mounted device and the next ground device through the first working radio and the second working radio; after receiving a connection disconnection request, disconnect the two packet domain wireless connections between the vehicle-mounted device and the supervisory ground device.

11. A communication method for a vehicle-mounted device, comprising: The vehicle-mounted host determines the target ground device to be connected, selects one from the first radio adapter module and the second radio adapter module as the target radio adapter module, and sends a connection establishment request to the target radio adapter module through the wireless control module in the same group as the target radio adapter module, wherein the connection establishment request carries the IP address information of the target ground device; After receiving the connection establishment request, the target radio station adaptation module establishes a first packet domain wireless connection based on an IP address of the target ground device through a first radio station, and establishes a second packet domain wireless connection based on another IP address of the target ground device through a second radio station; Among them, the vehicle-mounted equipment includes a vehicle-mounted host, a first control group and a second control group; the first control group includes: a first wireless control module, a first radio adapter module and a first radio; the second control group includes: a second wireless control module, a second radio adapter module and a second radio.

12. A train control vehicle-ground wireless communication system, comprising: Ground equipment, a wireless communication network and a vehicle-mounted device as described in any one of claims 1 to 10; The ground device includes: a first communication interface unit, a second communication interface unit and a ground host; the first communication interface unit is configured with an IP address, and the second communication interface unit is configured with another IP address; the ground host is configured to establish a first packet domain wireless connection with the vehicle-mounted device through the first communication interface unit, and to establish a second packet domain wireless connection with the vehicle-mounted device through the second communication interface unit.

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