A communication control server based on packet domain communication and its system and method

Abstract

The present invention discloses a communication control server based on packet domain communication, and its system and method. The communication control server comprises: a core logic processing communication unit, which includes a main processing unit for core logic processing and a communication unit for information exchange with the outside world; a network interaction unit connected to the communication unit, which is connected to the core logic processing communication unit. The network interaction unit is respectively connected to the dispatching centralized control system, the train control center, and the on-board equipment, and exchanges information with the on-board equipment based on a packet domain wireless network. The communication unit transmits a main check word to a safety supervision module. When the safety supervision module determines that the main check word is incorrect, a safety relay driver disconnects the external data transmission channel between the communication unit and the network interaction unit. Advantageously, the communication control server exchanges information with the outside world based on a packet domain wireless network, eliminating the need for an additional ISDN wireless communication server, thereby simplifying the overall structure and cost.

Description

Technical Field

[0001] The present invention relates to the field of rail transit communications, and in particular to a communication control server based on packet switch (PS) communication, and a system and method thereof. Background Art

[0002] With the opening of the Dongguan-Huizhou and Guangzhou-Foshan-Zhaoqing intercity railway lines in the Pearl River Delta in 2016, the intercity train operation control system CTCS2+ATO (Automatic Train Operation) system was officially put into use in China. It applied autonomous driving technology for the first time in the large-scale railway field, realized automatic control of train operation, and improved the system's degree of automation and transportation efficiency.

[0003] However, my country's current train control system (CTCS) is based on the circuit domain (CS) of the international wireless communication standard GSM-R for railways for train control and vehicle-to-ground communications, which has limited transmission efficiency. On the other hand, the peripheral capacity of the integrated services digital network (ISDN) communication card products is limited and the price is high (the cost accounts for half of the hardware cost). With the iterative evolution of wireless communication technology to 3G, 4G, 5G and even 6G, and the continuous emergence of more objective demands for vehicle-to-ground communication services, the existing train control wireless communication technology is increasingly unable to meet the surging business needs. At the same time, the cost of setting up the existing train control wireless communication network is also very high. In order to have better communication compatibility, meet the needs of higher bandwidth and business expansion, and reduce system costs, a communication control server with higher compatibility and the ability to meet higher business needs is needed. Summary of the Invention

[0004] The object of the present invention is to provide a communication control server based on packet domain communication and its system and method, wherein the communication control server combines a core logic processing communication unit and a network interaction unit, wherein the core logic processing communication unit includes a main processing unit and a communication unit, and the network interaction unit is respectively connected to the dispatching centralized control system, the train control center and the on-board equipment, and exchanges information with the on-board equipment based on the wireless network of the packet domain, without the need for an additional ISDN wireless communication server, thereby simplifying the overall structure and cost; at the same time, compared with the existing server that relies on the circuit domain wireless communication mechanism, the network transmission of the communication control server of the present invention has the characteristics of short disconnection and reconnection time, thereby improving the stability of the entire system.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A communication control server based on packet domain communication, comprising:

[0007] A core logic processing communication unit, comprising a main processing unit and a communication unit, wherein the main processing unit is used for the core logic processing of the communication control server, and the core logic processing communication unit exchanges information with the outside world through the communication unit;

[0008] A network interaction unit is connected to the core logic processing communication unit, the network interaction unit is respectively connected to the dispatching centralized control system, the train control center and the on-board equipment, and exchanges information with the on-board equipment based on the wireless network of the packet domain; the network interaction unit is connected to the communication unit, and the communication unit transmits the main check word to the safety supervision module. When the safety supervision module judges that the main check word is wrong, the safety relay driver cuts off the data external transmission channel between the communication unit and the network interaction unit.

[0009] Optionally, the main processing unit has a dual-machine redundant structure, and is used for message authentication security layer adaptation and checking the authenticity, sequence integrity, and timeliness of messages from the vehicle-mounted device.

[0010] Optionally, the main processing unit includes a first main processing module, a second main processing module and a switching module. The first main processing module and the second main processing module form the core logic processing communication unit, which is used for the core logic processing of the communication control server. The switching module is used for switching the master and standby systems of the core logic processing communication unit.

[0011] Optionally, the switching module monitors status parameters of the first main processing module and the second main processing module. When the status parameters of the main system processing unit monitored by the switching module are abnormal, the other main processing module is switched to the main system processing unit.

[0012] Optionally, the communication unit includes a first communication module and a second communication module, the second communication module receives the first main processing module and the second main processing module and the communication data therebetween, and outputs the communication data to be sent to the on-board device via the network interaction unit based on the wireless network in the packet domain; the communication data input by the on-board device is transmitted to the second communication module via the network interaction unit based on the wireless network in the packet domain, and then transmitted to the main processing unit;

[0013] The first communication module is used to control the timing of the communication control server. The first communication module receives the check words of each module, and derives the main check word from each check word and sends it to the security supervision module.

[0014] Optionally, when the main check word does not match the preset value, the safety supervision module determines that the main check word is wrong.

[0015] Optionally, also include:

[0016] A maintenance terminal is communicatively connected to the communication unit, and the maintenance terminal diagnoses and maintains various components of the communication control server.

[0017] Optionally, also include:

[0018] The power module is used to supply power to various components of the communication control server.

[0019] Optionally, a vehicle-to-ground communication system includes:

[0020] The communication control server based on packet domain communication, the network interaction unit of the communication control server is respectively connected to the dispatching centralized control system, the train control center and the on-board equipment, and exchanges information with the on-board equipment based on the wireless network of the packet domain.

[0021] Optionally, a method for performing vehicle-ground communication using the communication control server based on packet domain communication includes:

[0022] S1. Start the communication control server and complete the power-on self-test, initialization and data loading of the communication control server;

[0023] S2. The communication control server establishes a secure communication connection with the on-board equipment, train control center and dispatching centralized control system through the communication board and exchanges business communication data;

[0024] S3. The communication control server completes a secure communication connection with the vehicle-mounted device in real time through the wireless network of the packet domain, accepts registration or deregistration requests from the vehicle-mounted device based on secure network communication, and maintains the communication session status of the currently registered vehicle-mounted device;

[0025] S4. The communication control server receives the ATO status report of the currently registered on-board device from the on-board device and forwards it to the dispatching centralized control system, informing the dispatching centralized control system of the train number of the registered on-board device. The dispatching centralized control system sends the operation information of the corresponding train to the communication control server. After the communication control server parses and matches the corresponding on-board device, it sends the operation information to the corresponding on-board device based on the packet domain wireless network.

[0026] Optionally, also include:

[0027] S5. When the train is about to stop at the platform, the communication control server receives the platform screen door opening and closing command from the on-board equipment through the packet domain wireless network, and checks the validity and legality of the command parameters of the received platform screen door command; for the platform screen door command that passes the check, the communication control server will match the corresponding relay drive code position from the offline data, encapsulate it into a relay drive command packet and send it to the train control center corresponding to the platform screen door to be operated. The communication control server receives the platform screen door relay acquisition status from the train control center, converts it into the corresponding platform screen door status, and then sends it to the on-board equipment through the packet domain wireless network.

[0028] Optionally, the operation information includes the operation plan and return command information of the corresponding train.

[0029] Optionally, step S1 includes:

[0030] Communication control server power-on self-test, hardware initialization, Boolean logic initialization, DIV+BIT task initialization, timer interrupt task initialization, and loading of offline data and configuration files;

[0031] Initialization of the communication control server network and synchronization tasks, including initialization of the network card, writing of IP and gateway addresses, and initialization of variables and functions related to synchronization tasks between the master and standby systems and between CPUs;

[0032] Initialization of tasks for Railway Signalling Safety Protocol-I, Railway Signalling Safety Protocol-II and European Radio System Functional Interface Specification.

[0033] Optionally, the maintenance terminal of the communication control server records the message interactions of each step in real time and provides historical query and playback functions.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] The present invention provides a communication control server based on packet domain communication, and its system and method. The communication control server combines a core logic processing communication unit and a network interaction unit, wherein the core logic processing communication unit includes a main processing unit and a communication unit. The network interaction unit is respectively connected to the dispatching centralized control system, the train control center and the on-board equipment, and exchanges information with the on-board equipment based on the wireless network of the packet domain. No additional ISDN wireless communication server is required, which simplifies the overall structure and cost. At the same time, compared with the existing server that relies on the circuit domain wireless communication mechanism, the network transmission of the communication control server of the present invention has the characteristics of short disconnection and reconnection time, which improves the stability of the entire system.

[0036] Furthermore, the data of each unit / module in the communication control server is relatively independent and processed separately, which greatly reduces the amount of data transmission between the front and back ends and ensures the real-time and accuracy of data display.

[0037] Furthermore, in the vehicle-to-ground communication system of the present invention including the communication control server, each component is based on wireless network communication in the packet domain, which is losslessly backward compatible with LTE and 5G communication technologies, making the functions of the communication control server and the system more scalable. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of a communication control server based on packet domain communication according to the present invention;

[0039] Figure 2 This is a schematic diagram of a secure communication architecture for getting off a vehicle based on packet domain communication according to the present invention. DETAILED DESCRIPTION

[0040] The present invention will be further described below by describing a preferred embodiment in detail with reference to the accompanying drawings.

[0041] like Figure 1 and Figure 2 The figure shows a packet-domain communication-based communication control server (CCS) of the present invention. The CCS is a core component of the ground-based ATO equipment, primarily enabling wireless communication between trackside and onboard equipment on the train, managing platform screen door opening and closing commands, and ultimately managing and forwarding the operation plan. Furthermore, during the door-to-platform door linkage execution process, the onboard equipment on the train is responsible for issuing platform screen door opening and closing commands, while the CCS is responsible for logical execution and management functions such as storage, verification, and forwarding of platform screen door commands. The train control center (TCC) is the actual execution device for platform screen door commands. During the operation plan execution process, the centralized dispatching control system (CTC) is responsible for providing the operation plan, while the CCS is responsible for management functions such as storage and forwarding of the operation plan, and the onboard equipment is the actual execution device for the operation plan.

[0042] like Figure 1 As shown, in the present invention, the communication control server CCS based on packet domain communication mainly includes a core logic processing communication unit CCPS and a network interaction unit GGW.

[0043] Specifically, the core logic processing communication unit CCPS includes a main processing unit and a communication unit MCU. The main processing unit is used for the core logic processing of the communication control server CCS (primarily the logical execution and management functions such as storage, verification, and forwarding of screen door commands). The core logic processing communication unit CCPS exchanges information with the outside world through the communication unit MCU (external interface function). The network interaction unit GGW is connected to the core logic processing communication unit CCPS. The network interaction unit GGW is respectively connected to the centralized dispatching control system CTC, the train control center TCC, and the on-board equipment, and exchanges information with the on-board equipment based on the wireless network of the packet domain. The network interaction unit GGW is connected to the communication unit MCU, and the communication unit MCU transmits the main check word to the security supervision module VPS. When the security supervision module VPS judges the main check word as incorrect, the security supervision module VPS cuts off the output between the communication unit MCU and the network interaction unit GGW through the safety relay driver VRD, thereby cutting off the communication unit MCU's external transmission channel for erroneous data, and guiding the entire system to the safety side.

[0044] In this embodiment, the main processing unit is a dual-machine redundant structure, which includes two independent computing units. The main processing unit is used for message authentication security layer adaptation and checking the authenticity, sequence integrity and timeliness of vehicle-mounted device messages.

[0045] Specifically, the main processing unit includes a first main processing module, namely main processing unit 1, a second main processing module, namely main processing unit 2, and a switching module, namely switching unit. The first main processing module and the second main processing module form the master-slave system of the core logic processing communication unit CCPS and are used for the core logic processing of the communication control server CCS (for example, the storage, verification, forwarding, and other logical execution and management of shielded door commands). The first main processing module and the second main processing module can both include application software ASW and platform software BSW to complete the main logic and operation functions of the communication control server CCS, specifically including the application function, security protection function, voting and monitoring function of the communication control server CCS. The above functions are all completed simultaneously in the first main processing module and the second main processing module to achieve a two-out-of-two function.

[0046] The switching module is used to switch between the primary and backup systems of the core logic processing communication unit (CCPS), i.e., dual-system active-standby switching. Optionally, the switching module monitors the status parameters of the first and second primary processing modules. When the switching module detects an abnormality in the status parameters of the current primary processing unit, the other primary processing module is switched to become the primary processing unit.

[0047] like Figure 1As shown, in this embodiment, the communication unit MCU includes a first communication module MCU1 and a second communication module MCU2. The second communication module MCU2 receives the communication data between the first main processing module and the second main processing module and the communication data between the two, and outputs the communication data to be sent to the outside (on-board equipment) through the network interaction unit GGW based on the wireless network of the packet domain. The communication data input from the outside is transmitted to the second communication module MCU2 through the network interaction unit GGW based on the wireless network of the packet domain, and then transmitted to the main processing unit. Optionally, the communication control server CCS exchanges data with the dispatching centralized control system CTC and the train control center TCC through a wired network.

[0048] The first communication module MCU1 is used to control the timing of the communication control server CCS. The first communication module MCU1 receives the check words of each module (the first main processing module, the second main processing module and the second communication module MCU2), and derives the main check word from each check word and sends it to the security supervision module VPS. In actual application, the first main processing module and the second main processing module both send multiple branch check words (usually ten) to the first communication module MCU1. The second communication module MCU2 is responsible for processing the external and internal communications of the main processing unit and the merging of the dual-channel output data, and generates a JTC check word and sends it to the first communication module MCU1. The first communication module MCU1 calculates and generates the main check word based on the received check words. The security supervision module VPS judges the correctness of the main check word. When the main check word does not match the preset value, the security supervision module VPS judges the main check word as wrong, and the safety relay driver VRD cuts off the data external transmission channel between the communication unit MCU and the network interaction unit GGW.

[0049] Furthermore, the packet-domain communication-based communication control server CCS of the present invention further includes a maintenance terminal SDMS (System Diagnosis Maintenance Sub-system), which is communicatively connected to the second communication module MCU2 of the communication unit MCU. The maintenance terminal SDMS performs diagnosis and maintenance on various components of the communication control server CCS. Because the second communication module MCU2 serves as the external information data transmission port for multiple modules within the communication control server CCS, parameter information of each module of the communication control server CCS can be obtained from the second communication module MCU2, thereby enabling monitoring, diagnosis, and maintenance of each module.

[0050] Furthermore, the communication control server CCS based on packet domain communication of the present invention further includes a power supply module, which is used to supply power to various components of the communication control server CCS.

[0051] Based on the same inventive concept, the present invention also provides a vehicle-ground communication system, which mainly includes the above-mentioned communication control server CCS based on packet domain communication, the dispatching centralized control system CTC, the train control center TCC and the on-board equipment communication. The network interaction unit GGW of the communication control server CCS is respectively connected to the dispatching centralized control system CTC, the train control center TCC and the on-board equipment, and exchanges information with the on-board equipment based on the wireless network of the packet domain.

[0052] like Figure 1 and Figure 2 As shown in the figure, the communication control server CCS of the present invention cancels the ISDN server, and the transport layer and network layer are implemented by TCP / IP, replacing the original ISO TP2 and T.70 protocols. The network interaction unit GGW of the present invention acts as the gateway of the communication control server CCS, accepts requests from the wireless network client on the vehicle, and maintains this TCP connection. This function realizes Figure 2 The functional requirements of the middle transport layer and below. The communication unit MCU completes Figure 2 The non-safety functional protocol of the adaptation and redundancy management layer (ALE) is implemented, and the network interaction unit GGW and the communication unit MCU jointly complete the communication function module. The message authentication security layer adaptation is implemented in the main processing unit 1 and the main processing unit 2, and the system completes the authenticity, sequence integrity and timeliness inspection of the vehicle-borne messages. In this technical solution, the vehicle-borne equipment is directly connected to the server gateway network interaction unit GGW, which simplifies the structure and cost of the server and system. Through testing in the GPRS network environment, when the size of each data packet is 500 bytes, the network throughput can reach 4KB / S, which is much better than the network transmission under the circuit domain communication condition.

[0053] Based on the same inventive concept, the present invention further provides a method for vehicle-ground communication using the communication control server CCS based on packet domain communication, the method comprising:

[0054] S1. Start the communication control server CCS and complete the power-on self-test, initialization and data loading of the communication control server CCS.

[0055] In this embodiment, step S1 includes:

[0056] S11, Communication Control Server CCS power-on self-test, hardware initialization, Boolean logic initialization, DIV+BIT (built-in self-test under different architectures) task initialization, timer interrupt task initialization, offline data and configuration file loading, etc.;

[0057] S12, communication control server CCS network and synchronization task initialization, which includes initializing the network card, writing the IP and gateway addresses, and initializing the variables and functions related to the synchronization tasks between the master and standby systems and between the CPUs;

[0058] Initialize tasks such as S13, Railway Signaling Security Protocol-I (interface with the Train Control Center (TCC)), Railway Signaling Security Protocol-II (interface with the Centralized Dispatching Control System (CTC), and European Radio System Functional Interface Specification Subset 037 (interface with onboard equipment). To ensure communication security, the Communication Control Server (CCS) must use security protocols when communicating with external parties to prevent network data delays, spoofing, reordering, or insertion.

[0059] S2. The communication control server CCS establishes a secure communication connection with the on-board equipment, the train control center TCC and the dispatching centralized control system CTC through the communication board and exchanges business communication data.

[0060] S3. The communication control server CCS completes the secure communication connection with the vehicle-mounted device in real time through the packet domain wireless network GSM-R (LTE Long Term Evolution), accepts the registration or deregistration request of the vehicle-mounted device based on the secure network communication, and maintains the communication session status of the currently registered vehicle-mounted device.

[0061] S4. The communication control server (CCS) receives the train's ATO status report from the currently registered on-board device and forwards it to the centralized dispatching control system (CTC), notifying the centralized dispatching control system (CTC) of the train number of the registered on-board device. The centralized dispatching control system (CTC) then sends the corresponding train's operational information to the communication control server (CCS). The communication control server (CCS) parses and matches the corresponding on-board device and sends the operational information to the corresponding on-board device over the packet domain wireless network. Optionally, the operational information includes information such as the corresponding train's operational plan and return command. Of course, the operational information is not limited to the examples above.

[0062] Furthermore, the method of the present invention for vehicle-ground communication using the communication control server CCS based on packet domain communication also includes: S5. When the train is about to stop at the platform, the communication control server CCS receives a platform screen door switch command from the on-board equipment through the packet domain wireless network, and performs validity and legality checks on the command parameters of the received platform screen door command; for the platform screen door command that passes the check, the communication control server CCS will match the corresponding relay drive code position from the offline data, encapsulate it into a relay drive command packet and send it to the train control center TCC corresponding to the platform screen door to be operated; the communication control server CCS receives the platform screen door relay acquisition status from the train control center TCC, converts it into the corresponding platform screen door status, and sends it to the on-board equipment through the packet domain wireless network.

[0063] During each step, DIV+BIT performs real-time monitoring of the CPU, offline storage files, and memory of the communication control server (CCS). Furthermore, the CCS maintenance terminal (SDMS) records the message interactions during each step (primarily steps S2 through S5) in real time and provides historical query and playback capabilities. The SDMS maintenance terminal also provides a graphical display interface for the station, clearly showing the status of online onboard equipment and platform screen doors. A graphical display interface displays the real-time communication connection status of external devices, intuitively reflecting the equipment's operating status.

[0064] From the above, it can be seen that the overall process of the method of the present invention includes offline configuration reading, hardware and network task initialization, safety detection technology initialization and processing, shield door opening and closing command management, operation plan management, application layer message interaction with external equipment (dispatching centralized control system CTC, train control center TCC, on-board equipment), maintenance diagnostic information processing and other processing processes.

[0065] To sum up, the present invention provides a communication control server CCS based on packet domain communication and its system and method, in which the communication control server CCS combines the core logic processing communication unit CCPS and the network interaction unit GGW, etc., wherein the core logic processing communication unit CCPS includes a main processing unit and a communication unit MCU, and the network interaction unit GGW is respectively communicated with the dispatching centralized control system CTC, the train control center TCC and the on-board equipment, and exchanges information with the on-board equipment based on the wireless network of the packet domain, without the need for an additional ISDN wireless communication server, thereby simplifying the overall structure and cost; at the same time, compared with the existing server that relies on the circuit domain wireless communication mechanism, the network transmission of the communication control server CCS of the present invention has the characteristics of short disconnection and reconnection time, thereby improving the stability of the entire system.

[0066] Furthermore, the data of each unit / module in the communication control server CCS is relatively independent and processed separately, which greatly reduces the amount of data transmission between the front and back ends and ensures the real-time and accuracy of data display.

[0067] Furthermore, in the vehicle-to-ground communication system of the present invention including the communication control server CCS, each component is based on wireless network communication in the packet domain, which is losslessly backward compatible with LTE and 5G communication technologies, making the functions of the communication control server CCS and the system more scalable.

[0068] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A communication control server based on packet domain communication, characterized in that: Include: A core logic processing communication unit, comprising a main processing unit and a communication unit, wherein the main processing unit is used for the core logic processing of the communication control server, and the core logic processing communication unit exchanges information with the outside world through the communication unit; a network interaction unit connected to the core logic processing communication unit, the network interaction unit being respectively connected to the dispatching centralized control system, the train control center, and the on-board equipment, and exchanging information with the on-board equipment based on a wireless network in the packet domain; the network interaction unit being connected to the communication unit, the communication unit transmitting a master check word to the safety supervision module; when the safety supervision module determines that the master check word is incorrect, a safety relay driver cuts off the data external transmission channel between the communication unit and the network interaction unit; The main processing unit includes a first main processing module, a second main processing module and a switching module. The first main processing module and the second main processing module form the main and backup systems of the core logic processing communication unit and are used for core logic processing of the communication control server. The switching module is used for switching the main and backup systems of the core logic processing communication unit. The communication unit includes a first communication module and a second communication module, wherein the second communication module receives communication data from the first main processing module and the second main processing module and the communication data between the two, and outputs the communication data to be sent to the vehicle-mounted device through the network interaction unit based on the wireless network in the packet domain; the communication data input by the vehicle-mounted device is transmitted to the second communication module through the network interaction unit based on the wireless network in the packet domain, and then transmitted to the main processing unit; The first communication module is used to control the timing of the communication control server. The first communication module receives the check words of each module, and derives the main check word from each check word and sends it to the security supervision module.

2. The communication control server based on packet domain communication according to claim 1, characterized in that The main processing unit is a dual-machine redundant structure, and is used for message authentication security layer adaptation and checking the authenticity, sequence integrity and timeliness of vehicle-mounted device messages.

3. The communication control server based on packet domain communication according to claim 1, characterized in that: The switching module monitors the status parameters of the first main processing module and the second main processing module. When the status parameters of the main system processing unit monitored by the switching module are abnormal, the other main processing module is switched to the main system processing unit.

4. The communication control server based on packet domain communication according to claim 1, characterized in that When the main check word does not match the preset value, the safety supervision module determines that the main check word is wrong.

5. The communication control server based on packet domain communication according to claim 1, characterized in that: Also includes: A maintenance terminal is communicatively connected to the communication unit, and the maintenance terminal diagnoses and maintains various components of the communication control server.

6. The communication control server based on packet domain communication according to claim 1, characterized in that: Also includes: The power module is used to supply power to various components of the communication control server.

7. A vehicle-to-ground communication system, characterized in that: Include: The communication control server based on packet domain communication according to any one of claims 1 to 6, wherein the network interaction unit of the communication control server is respectively communicatively connected with the dispatching centralized control system, the train control center and the on-board equipment, and exchanges information with the on-board equipment based on the wireless network of the packet domain.

8. A method for vehicle-ground communication using the communication control server based on packet domain communication according to any one of claims 1 to 6, characterized in that: Include: S1. Start the communication control server and complete the power-on self-test, initialization and data loading of the communication control server; S2. The communication control server establishes a secure communication connection with the on-board equipment, train control center and dispatching centralized control system through the communication board and exchanges business communication data; S3. The communication control server completes a secure communication connection with the vehicle-mounted device in real time through the wireless network of the packet domain, receives a registration or deregistration request from the vehicle-mounted device under secure network communication, and maintains the communication session status of the currently registered vehicle-mounted device; S4. The communication control server receives the ATO status report of the currently registered on-board device from the on-board device and forwards it to the dispatching centralized control system, informing the dispatching centralized control system of the train number of the registered on-board device. The dispatching centralized control system sends the operation information of the corresponding train to the communication control server. After the communication control server parses and matches the corresponding on-board device, it sends the operation information to the corresponding on-board device based on the packet domain wireless network.

9. The method for vehicle-ground communication using the communication control server based on packet domain communication according to claim 8, characterized in that: Also includes: S5. When the train is about to stop at the platform, the communication control server receives the platform screen door opening and closing command from the on-board equipment through the packet domain wireless network, and checks the validity and legality of the command parameters of the received platform screen door command; for the platform screen door command that passes the check, the communication control server will match the corresponding relay drive code position from the offline data, encapsulate it into a relay drive command packet and send it to the train control center corresponding to the platform screen door to be operated. The communication control server receives the platform screen door relay acquisition status from the train control center, converts it into the corresponding platform screen door status, and then sends it to the on-board equipment through the packet domain wireless network.

10. The method for vehicle-ground communication using the communication control server based on packet domain communication according to claim 8, characterized in that: The operation information includes the operation plan and turn-back command information of the corresponding train.

11. The method for vehicle-ground communication using the communication control server based on packet domain communication according to claim 8, characterized in that: Said S1 comprises: Communication control server power-on self-test, hardware initialization, Boolean logic initialization, DIV+BIT task initialization, timer interrupt task initialization, and loading of offline data and configuration files; Initialize the communication control server network and synchronization tasks, including initializing the network card, writing the IP and gateway addresses, and initializing variables and functions related to synchronization tasks between the master and standby systems and between CPUs; Initialization of tasks for Railway Signalling Safety Protocol-I, Railway Signalling Safety Protocol-II and European Radio System Functional Interface Specification.

12. The method for vehicle-ground communication using the communication control server based on packet domain communication according to claim 8, characterized in that: The maintenance terminal of the communication control server records the message interactions of each step in real time and provides historical query and playback functions.

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