Onboard equipment and implementation method for multi-network converged communication transmission on trains

Abstract

This invention provides an onboard device and implementation method for multi-network converged communication transmission on trains, including a main control unit, a wireless transmission unit, an interface unit, a storage unit, and a power supply unit. The wireless transmission unit includes a GSM-R module, a public network mobile communication module, a WLAN_WIFI module, and a GPS / BDS satellite receiving module. The interface unit includes a switch circuit, a controller circuit, and an interface circuit. Real-time data wireless transmission is achieved through the GSM-R module and the public network mobile communication module, while non-real-time data wireless transmission is achieved through the WLAN_WIFI module. This invention realizes a multi-network converged communication method integrating railway private network GSM-R, public mobile communication network (3G / 4G), and railway wireless local area network WLAN_WIFI, effectively solving the signal coverage problem along railway lines, effectively improving the communication efficiency and reliability of railway vehicle-to-ground wireless communication, and enhancing the safety of railway transportation.

Description

Technical Field

[0001] This invention belongs to the field of railway communication technology, specifically, it relates to an onboard device and its implementation method for multi-network converged communication transmission on trains. Background Technology

[0002] Existing railway wireless communication mainly includes the railway GSM_R mobile communication system and the 450MHz train dispatching wireless communication system. These systems primarily transmit information such as dispatching voice messages, train numbers, dispatching commands, and CTCS-3 train control data, enabling numerous business functions such as train operation monitoring, operation dispatching, and train control. They play a vital role in ensuring train operation safety, improving transportation efficiency, and enhancing modern management levels.

[0003] With the rapid development of high-speed, automated, and intelligent train operations, the supporting role of information technology is becoming increasingly prominent. Compared with traditional trains, modern trains (such as high-speed trains) are equipped with numerous information collection devices. These include: Carriage Integrated Wireless Communication (CIR); EMU Driver Operation Information Analysis System (EOAS); EMU Onboard Wireless Transmission System (WTD); Carriage Distance Monitoring and Diagnostic System (CMD); Train Control Equipment Dynamic Monitoring System (DMS); Train Operation Status Information System (LAIS); Train Operation Monitoring Equipment (LKJ); and dual-mode tail locomotive control station. How to safely, quickly, and reliably transmit the large amounts of information collected by these different onboard devices to various ground control centers for analysis and processing to ensure train operation safety has become one of the important challenges facing train-to-ground communication. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide an on-board device and implementation method for train multi-network converged communication transmission, so as to overcome the defects in the prior art.

[0005] To achieve the above objectives, the present invention provides an onboard device for multi-network converged communication transmission on trains. The onboard device includes a main control unit, a wireless transmission unit, an interface unit, a storage unit, and a power supply unit. The wireless transmission unit includes a GSM-R module, a public network mobile communication module, a WLAN_WIFI module, and a GPS / BDS satellite receiving module. The main control unit is electrically and signal-connected to the GSM-R module, the public network mobile communication module, the WLAN_WIFI module, and the GPS / BDS satellite receiving module, respectively, enabling the main control unit to achieve real-time wireless data transmission via the GSM-R module and the public network mobile communication module, to achieve non-real-time wireless data transmission via the WLAN_WIFI module, and to receive local geographical location information from satellite positioning via the GPS / BDS satellite receiving module. The interface unit includes a switch circuit, a controller circuit, and an interface circuit. The switch circuit is electrically and signal-connected to the main control unit and multiple onboard devices via an Ethernet interface, enabling the switch circuit to provide power to the main control unit and multiple onboard devices. The system provides Ethernet data exchange; the controller circuit and the main control unit are electrically and signal-connected via Ethernet communication; the controller circuit is electrically and signal-connected to the switch circuit via an Ethernet interface; the controller circuit's UART serial port is electrically and signal-connected to multiple on-board devices via an RS422 level conversion circuit, enabling the controller circuit to achieve protocol conversion between RS422 serial port data and Ethernet interface data for high-speed data communication between the main control unit and multiple on-board devices; the interface circuit consists of multiple RS422 interfaces and Ethernet interfaces to enable high-speed data communication between the main control unit and multiple on-board devices with RS422 or Ethernet interfaces; the storage unit is electrically and signal-connected to the main control unit, enabling the main control unit to transmit fault record files, event record files, and log record files received from various on-board devices to the storage unit for storage; the power supply unit provides DC 110V power to the locomotive, and through a DC 110V to DC 13.8V power module, it provides DC 13.8V operating voltage to the main control unit, wireless transmission unit, interface unit, and storage unit.

[0006] The above technical solution, by setting up a GSM-R module, a public mobile communication module, and a WLAN_WIFI module, realizes a multi-network converged communication mode, including railway private network GSM-R, public mobile communication network (3G / 4G), and railway wireless local area network WLAN_WIFI. This effectively solves the signal coverage problem along the railway line, realizes the function of high-speed wireless transmission of business information collected by multiple train monitoring devices, and achieves high-speed and reliable high-speed mobile communication between the railway train and the ground. This effectively improves the communication efficiency and reliability of railway train-to-ground wireless communication and enhances the safety of railway transportation.

[0007] As a further explanation of the on-board equipment for train multi-network converged communication transmission described in this invention, preferably, the main control unit includes a primary main control and a backup main control, wherein the primary main control and the backup main control are connected by serial port electrical connection and signal connection to achieve a hot backup working mode.

[0008] Through the above technical solution, during normal operation, the primary main controller transmits operation records and maintenance logs to the backup main controller in real time to achieve data synchronization. When the primary main controller fails, it automatically switches to the backup main controller to continue the work tasks and sends fault alarm information to the ground dispatch center.

[0009] As a further explanation of the on-board equipment for train multi-network converged communication transmission described in this invention, preferably, the network port expansion is achieved by cascading two switch chips.

[0010] The above technical solution fulfills the requirement of connecting multiple vehicle-mounted devices.

[0011] As a further explanation of the on-board equipment for train multi-network converged communication transmission described in this invention, preferably, the WLAN_WIFI module includes a WLAN signal automatic retrieval and connection submodule and a wireless local area network (WLAN) routing submodule; the WLAN signal automatic retrieval and connection submodule automatically connects to the local area network within the current railway section to construct a corresponding WLAN data communication channel to complete the wireless transmission of non-real-time data from the locomotive; the WLAN routing submodule, based on the successful construction of the existing WLAN data communication channel, reconstructs the WLAN to provide wireless access hotspots for other communication terminals.

[0012] The above technical solution enables wireless data transmission between various communication terminals within the Le Wireless LAN.

[0013] As a further explanation of the on-board equipment for train multi-network converged communication transmission described in this invention, preferably, the main control unit is electrically and signal-connected to the WLAN_WIFI module via serial communication to set the parameters of the WLAN_WIFI module; the main control unit is electrically and signal-connected to the WLAN_WIFI module via an Ethernet interface to perform data communication.

[0014] The above technical solution enables data communication between the main control unit and the WLAN_WIFI module.

[0015] As a further explanation of the on-board equipment for train multi-network converged communication transmission described in this invention, preferably, the on-board equipment also includes an AC220V to DC48V regulated power supply module and a PSE power controller circuit.

[0016] The above technical solution realizes the PSE power supply function and enables the detection, classification, current limiting, and load disconnection detection of the powered device.

[0017] As a further explanation of the onboard equipment for train multi-network converged communication transmission described in this invention, preferably, the onboard equipment interacts with the onboard equipment of each business system through an RS422 interface or an Ethernet interface; the onboard equipment interacts with the ground receiving equipment through a GSM-R module, a public network mobile communication module, or a WLAN_WIFI module; the ground receiving equipment interacts with the ground access gateway through Ethernet, and the ground receiving equipment is deployed in EMU depots, locomotive depots, and stations; the ground access gateway interacts with the business control center equipment through Ethernet interconnection, and the ground access gateway is deployed in the safety production network.

[0018] The above technical solution realizes a multi-network converged communication vehicle monitoring information integrated transmission system.

[0019] As a further explanation of the onboard equipment for train multi-network converged communication transmission described in this invention, preferably, the ground receiving equipment includes an M-GRIS data forwarding server, an MTUP security platform, and a WLAN data forwarding server; the onboard equipment accesses the GSM-R network via a GSM-R module and interacts with the ground access gateway in real time via the M-GRIS data forwarding server; the onboard equipment accesses the public mobile communication network via a public network mobile communication module and interacts with the ground access gateway in real time via the MTUP security platform; the onboard equipment accesses the railway private network WLAN via a WLAN_WIFI module and interacts with the ground access gateway in non-real-time via the WLAN data forwarding server.

[0020] To achieve another objective of the present invention, the present invention also provides a method for implementing multi-network converged communication transmission using the aforementioned onboard equipment for train multi-network converged communication transmission. The method includes: when the onboard equipment is in automatic communication selection mode, the main control unit, through the GSM-R module and the public mobile communication module, automatically selects a matching communication mode based on the signal mode and strength status of various wireless base stations in the current environment, and establishes a communication connection with the wireless base station with the best signal strength in the same mode to access the GSM-R network or the public mobile communication network. After successful communication connection, the onboard equipment can communicate with the ground receiving equipment to realize the wireless transmission of real-time locomotive data; when the onboard equipment is in manual communication selection mode, the main control unit controls the switching... The device switches to a designated communication mode: a GSM-R module or a public network mobile communication module, to access the GSM-R network or public mobile communication network and achieve wireless mobile communication between the device and the ground receiver. When the vehicle-mounted device selects the public network mobile communication mode, the main control unit, based on the signal strength of the currently selected wireless base station, first switches the public network mobile communication module to the highest-level wireless communication mode. Simultaneously, it monitors the base station signal status in real time. If the currently selected wireless communication mode cannot achieve communication, it selects the next lower-level network mode for switching. The wireless communication modes include LTE, 3G, and 2G. Switching can be done in a downward direction, including switching from LTE to 3G, 3G to 2G, and LTE to 2G. It can also switch in an upward direction, i.e., from 2G to 3G, 3G to LTE, and 2G to LTE. However, generally speaking, base stations with higher-level network modes are compatible with lower-level network modes; therefore, downward switching is preferred.

[0021] The above technical solution enables real-time wireless data transmission based on mobile base stations.

[0022] As a further explanation of the multi-network converged communication transmission implementation method of the present invention, preferably, when the vehicle-mounted equipment accesses the GSM-R network or the public mobile communication network, the WLAN_WIFI module can automatically connect to the local area network within the current railway section to construct a corresponding local area network data communication channel to complete the internal transmission process of non-real-time data of the locomotive within the local area network; or it can use the local machine as a local area network router to build a new local area network, providing wireless access hotspots for other devices within the local area network, and realizing large-volume wireless digital communication between other communication terminals within the wireless local area network and the local machine.

[0023] The above technical solution enables non-real-time wireless data transmission based on a local area network (WLAN).

[0024] The beneficial effects of this invention are:

[0025] 1. The vehicle-mounted equipment of the present invention, by setting up a GSM-R module, a public mobile communication module, and a WLAN_WIFI module, realizes a multi-network converged communication mode including railway private network GSM-R, public mobile communication network (3G / 4G), and railway wireless local area network WLAN_WIFI. It effectively solves the signal coverage problem along the railway line, realizes the function of high-speed wireless transmission of business information collected by multiple train monitoring devices, and high-speed and reliable railway vehicle-to-ground mobile communication, effectively improving the communication efficiency and reliability of railway vehicle-to-ground wireless communication, and improving the safety of railway transportation.

[0026] 2. The vehicle-mounted equipment of the present invention, by setting up a GPS / BDS satellite receiving module, can automatically correct the carrier frequency shift based on satellite geographical location information and locomotive speed information, thereby reducing the impact of the Doppler frequency shift effect caused by the high-speed movement of railway locomotives.

[0027] 3. The vehicle-mounted equipment of the present invention supports RS422 wired digital communication and forms a wired Ethernet local area network with various vehicle-mounted communication devices on the locomotive for wired data communication, realizing high-speed wired data communication within the local area network, with a maximum communication rate of 100 Mbit / s.

[0028] 4. The main control unit of this invention is based on ARM embedded high-speed digital processing technology, and the on-board equipment adopts adaptive technology to automatically adjust the data transmission rate of the interface with various business train monitoring equipment, effectively reducing latency and meeting the needs of multi-business, large-capacity monitoring information interaction. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the onboard equipment for train multi-network converged communication transmission according to the present invention.

[0030] Figure 2 This is a schematic diagram of the train multi-network converged communication transmission system of the present invention.

[0031] Figure 3 This describes the data transmission control process of the multi-mode wireless communication module of the present invention.

[0032] Figure 4 This is the data transmission control process of the WLAN signal automatic retrieval and connection submodule of the present invention.

[0033] Figure 5 This describes the data transmission control process of the wireless local area network routing submodule of the present invention. Detailed Implementation

[0034] To further understand the structure, features, and other objectives of the present invention, a detailed description is provided below with reference to the accompanying drawings. The embodiments illustrated in these drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0035] First, please refer to Figure 1 , Figure 1 This is a schematic diagram of the onboard equipment for multi-network converged communication transmission in trains according to the present invention. Figure 1 As shown, an onboard device for train multi-network converged communication transmission according to the present invention includes a main control unit 11, a wireless transmission unit 12, an interface unit 13, a storage unit 14, and a power supply unit 15.

[0036] Main control unit

[0037] The main control unit 11 is the central hub of the multi-network converged communication integrated transmission vehicle equipment. It is responsible for connecting the various components of the equipment, communicating with each component according to the specified protocol interface, and analyzing and processing the data information transmitted on the communication link.

[0038] Based on low-power, high-speed ARM embedded digital processing technology, the main control unit 11 adopts the AM335x embedded microprocessor with high-speed data processing capabilities, combined with the multi-process, multi-threaded software architecture of the Linux operating system, to achieve efficient and reliable multi-network converged communication and integrated transmission of vehicle-mounted equipment communication data processing functions. The AM335X is a microprocessor chip based on the ARM Cortex-A8 core, with an industrial-grade temperature range of -40℃ to +85℃, a maximum clock frequency of 1GHz, a large-capacity Flash memory, support for eMMC memory cards and expandable SD cards, support for 6-channel UART serial communication, support for 2-channel USB 2.0 high-speed data communication, and support for 2-channel industrial-grade Gigabit Ethernet (MAC) interface data communication.

[0039] The main control unit uses Ethernet communication to achieve real-time information exchange with onboard devices in various business systems. Ethernet communication has advantages such as high communication speed (selectable 10Mbit / s or 100Mbit / s) and strong scalability, enabling rapid multi-network converged communication and integrated transmission. Onboard devices and various onboard devices form a wired Ethernet local area network, realizing high-speed wired data communication within the local area network. Since each access device has a unique IP address within the same Ethernet, the main control unit can establish an onboard device information exchange table (IP address + port number) to quickly locate each onboard device and achieve accurate management of business data transmission and reception.

[0040] The main control unit supports USB data communication. The device communicates with computer software via USB interface to realize device maintenance functions such as parameter query and setting, and file operation functions such as importing and exporting various files.

[0041] The main control unit 11 includes a primary main control and a backup main control. The primary main control and the backup main control are connected by serial port electrical connection and signal connection to realize hot backup operation mode. During normal operation, the primary main control transmits operation records and maintenance logs to the backup main control in real time to realize data synchronization function. When the primary main control fails, the backup main control automatically switches to continue the work task and sends fault alarm information to the ground dispatch center.

[0042] Wireless transmission unit

[0043] The wireless transmission unit 12 includes a GSM-R module 121, a public network mobile communication module 122, a WLAN_WIFI module 123, and a GPS / BDS satellite receiving module 124. The main control unit 11 is electrically and signal-connected to the GSM-R module 121, the public network mobile communication module 122, the WLAN_WIFI module 123, and the GPS / BDS satellite receiving module 124, respectively. This allows the main control unit 11 to wirelessly transmit real-time data via the GSM-R module 121 and the public network mobile communication module 122, and to wirelessly transmit non-real-time data via the WLAN_WIFI module 123. The main control unit 11 receives its own geographical location information from satellite positioning via the GPS / BDS satellite receiving module 124 and periodically sends this information to the dispatch center. The satellite positioning information includes time information, and the device supports automatic time synchronization based on the time information in the satellite positioning information.

[0044] The GSM-R module 121 uses the SIM800C communication module, a quad-band GSM / GPRS module with a castle-hole package. It offers stable performance, a compact design, and can meet the needs of various application scenarios.

[0045] The SIM800C operates at GSM / GPRS 850 / 900 / 1800 / 1900MHz, enabling low-power transmission of voice, SMS, and data information. It complies with the service requirements, main electrical characteristics, and operating environment requirements of Class III modules in TJ / DW153-2014.

[0046] The vehicle-mounted device 1 employs two GSM-R modules operating simultaneously in a load-sharing manner. Each GSM-R module sends a heartbeat packet every 60 seconds to provide activity monitoring for the multi-network converged communication vehicle-mounted monitoring information transmission system. The multi-network converged communication vehicle-mounted device needs to maintain the module status (idle, busy, online, offline, etc.) in real time and be able to reset the modules promptly in case of an anomaly. When sending data, the module that is idle is used; if both modules are busy, the transmission is blocked and waits.

[0047] The public network mobile communication module 122 uses the ME3630 module, which is a wireless communication module based on the LTE standard that provides basic global mobile communication network coverage. Under the LTE standard, this module can provide a maximum uplink rate of 50Mbps and a downlink rate of 150Mbps, and supports fallback to 3G or 2G networks. This module supports diversity reception, which means that the terminal product supports dual antennas to improve communication quality and reliability. This module supports wide-temperature operation and is widely used in scenarios such as vehicle tracking, vehicle communication, and vehicle monitoring.

[0048] The vehicle-mounted device 1 employs two ME3630 modules operating simultaneously in a load-sharing manner. Each ME3630 module sends a heartbeat packet every 60 seconds to provide activity monitoring for the multi-network converged communication vehicle-mounted monitoring information integrated transmission system. The multi-network converged communication integrated transmission vehicle-mounted device needs to maintain the module status (idle, busy, online, offline, etc.) in real time and be able to reset the modules promptly in case of an anomaly. When sending data, the module that is idle is used for transmission; if both modules are busy, the transmission is blocked and waits.

[0049] The WLAN_WIFI module 123 uses the USR-WIFI232-B2 module to realize the integrated local area network transmission of large amounts of non-real-time data from vehicle-mounted equipment through multi-network converged communication. The USR-WIFI232-B2 module is an integrated 802.11b / g / n module that supports UART serial port and Ethernet interface communication.

[0050] The main control unit 11 is electrically and signal-connected to the WLAN_WIFI module 123 via serial communication to set the parameters of the WLAN_WIFI module 123; the main control unit 11 is electrically and signal-connected to the WLAN_WIFI module 123 via an Ethernet interface for data communication. The WLAN_WIFI module 123 automatically converts Ethernet data to wireless WLAN data protocols, thereby realizing the integrated transmission of wireless WIFI data communication between the vehicle-mounted equipment and the ground equipment through multi-network converged communication.

[0051] The WLAN_WIFI module 123 includes a WLAN signal automatic retrieval and connection submodule and a wireless LAN routing submodule. The WLAN signal automatic retrieval and connection submodule works by automatically connecting to the local area network within the current railway section and constructing a corresponding local area network data communication channel to complete the wireless transmission of non-real-time data from the locomotive. The wireless LAN routing submodule works by constructing a new local area network based on the successful construction of the existing local area network data communication channel, providing wireless access hotspots (APs) for other communication terminals to realize wireless data transmission between communication terminals within the wireless LAN.

[0052] The main control unit 11 implements multi-mode wireless communication module scheduling and control according to a preset process. First, the main control unit 11 detects and judges the signal mode, strength, and quality status of the private network and public network wireless base stations, selects the matching standard module, and automatically constructs a wireless transmission link. Then, it links the monitoring service information according to priority order to realize real-time and efficient wireless data transmission of locomotive monitoring services.

[0053] Interface unit

[0054] The interface unit 13 includes a switch circuit 131, a controller circuit 132, and an interface circuit 133.

[0055] The switch circuit 131 is electrically and signal-connected to the main control unit 11 and multiple vehicle-mounted devices through an Ethernet interface, so that the switch circuit 131 provides Ethernet data exchange between the main control unit 11 and multiple vehicle-mounted devices.

[0056] The switch circuit is built using the RTL8309N Fast Ethernet switch control chip to realize the function of a 10M / 100M 8-port switch. The chip integrates the physical layer interface (PHY), and only a few external circuits are needed to realize the function of an 8-port L2 switch. The solution is simple to implement and low in cost.

[0057] The switch circuit 131 expands the network ports by cascading two switch chips to meet the needs of connecting multiple vehicle-mounted devices.

[0058] The controller circuit 132 is electrically and signal-connected to the main control unit 11 via Ethernet communication. The controller circuit 132 is electrically and signal-connected to the switch circuit 131 via the Ethernet interface. Since the controller circuit 132 has one Ethernet (MAC) interface, the interface unit can be virtualized as an in-vehicle device, connected to the switch circuit, and configured with an independent IP address in the Ethernet.

[0059] The UART serial port of the controller circuit 132 is electrically and signal-connected to multiple vehicle-mounted devices through an RS422 level conversion circuit, so that the controller circuit 132 can realize the protocol conversion between RS422 serial port data and Ethernet interface data for high-speed data communication between the main control unit 11 and multiple vehicle-mounted devices.

[0060] The interface circuit 133 consists of multiple RS422 interfaces and Ethernet interfaces to enable high-speed data communication between the main control unit 11 and multiple vehicle-mounted devices with RS422 interfaces or Ethernet interfaces.

[0061] The vehicle-mounted device 1 provides a power supply solution for Ethernet. Power over Ethernet (PoE) technology refers to providing DC power to IP-based terminals (such as IP phones, wireless LAN access points (APs), and network cameras) while transmitting data signals using existing standard Ethernet cables, without any modifications to the existing Cat.5 Ethernet cabling infrastructure. PoE enables automatic detection, automatic power supply, automatic power-off, and overcurrent detection. The vehicle-mounted device 1 implements the PSE power supply function through an AC220V to DC48V regulated power supply module and a PSE power controller circuit, and performs detection, classification, current limiting, and load disconnection detection on the powered devices.

[0062] storage unit

[0063] The storage unit 14 is electrically and signal connected to the main control unit 11 so that the fault record files, event record files and log record files of various vehicle-mounted devices received by the main control unit 11 can be transmitted to the storage unit 14 for storage.

[0064] Power supply unit

[0065] The power supply unit 15 provides the locomotive with a DC 110V power supply, and through the DC 110V to DC 13.8V power module, it provides the main control unit 11, the wireless transmission unit 12, the interface unit 13 and the storage unit 14 with a DC 13.8V operating voltage.

[0066] like Figure 2 As shown, the vehicle-mounted device 1 interacts with the vehicle-mounted devices 2 of various business systems via an RS422 interface or an Ethernet interface. The vehicle-mounted device 1 interacts with the ground receiving device 3 via a GSM-R module 121, a public network mobile communication module 122, or a WLAN_WIFI module 123. The ground receiving device 3 interacts with the ground access gateway 4 via Ethernet. The ground receiving device 3 is deployed in EMU depots, locomotive depots, and stations. The ground access gateway 4 is interconnected with the business control center device 5 via Ethernet for information interaction. The ground access gateway 4 is deployed in the safety production network, forming a multi-network converged communication vehicle-mounted monitoring information integrated transmission system.

[0067] Ground receiving equipment 3 includes an M-GRIS data forwarding server, an MTUP security platform, and a WLAN data forwarding server; the vehicle-mounted equipment 1 accesses the GSM-R network via a GSM-R module 121 and interacts with the ground access gateway 4 in real time via the M-GRIS data forwarding server; the vehicle-mounted equipment 1 accesses the public mobile communication network via a public network mobile communication module 122 and interacts with the ground access gateway 4 in real time via the MTUP security platform; the vehicle-mounted equipment 1 accesses the railway private network WLAN via a WLAN_WIFI module 123 and interacts with the ground access gateway 4 in non-real-time via the WLAN data forwarding server.

[0068] The multi-network converged communication transmission between the aforementioned vehicle-mounted equipment and the vehicle-mounted equipment of various business systems, as well as the ground receiving equipment, includes real-time data wireless transmission based on mobile base stations and non-real-time data wireless transmission based on local area networks (WLANs). The implementation methods are as follows:

[0069] Real-time wireless data transmission based on mobile base stations

[0070] The onboard equipment adopts multiple mobile communication modes, including railway dedicated network GSM-R and public network LTE, 3G, and 2G. The mobile communication module supports both automatic selection of communication mode and manual configuration of communication mode.

[0071] like Figure 3 As shown, after the vehicle-mounted device is powered on, the main control unit first initializes, that is, starts the kernel bootloader and loads OpenWrt, which is a highly modular and highly automated embedded Linux operating system; secondly, it reads the network configuration conf.sh script file and reads the network selection mode configuration scheme.

[0072] If the automatic selection mode is selected, the main control unit will initiate the initialization of the multi-mode wireless communication module and set it to automatic selection mode. If the manual selection mode is selected, the main control unit will read the manual mode configuration information. If the working mode has been previously set, it will add communication mode identification information and initiate the initialization of the multi-mode wireless communication module. If the manual working mode has not been previously set, the main control unit will display an indicator light to indicate that the wireless mode configuration has failed and will enter a mode configuration waiting state. After the computer mode configuration is completed via the USB interface, it will enter a waiting state to determine whether to immediately restart the operating system, and wait for the system to restart.

[0073] After the main control unit initializes the multi-mode wireless communication module, it loads the wireless communication driver and communicates with the base station through the multi-mode wireless communication module to obtain information such as the signal mode, signal strength, and quality status of the nearby wireless base station. If the on-board equipment is in manual operation mode, it will establish a wireless communication link with the base station matched for manual mode. If it is in automatic mode, it will automatically construct a wireless transmission link by selecting a matching base station based on the base station information. After the wireless link is established, the main control unit links the monitoring service information according to priority, realizing the wireless transmission of real-time data for locomotive monitoring services.

[0074] Specifically, when the vehicle-mounted device 1 is in automatic communication selection mode, the main control unit 11, through the GSM-R module 121 and the public network mobile communication module 122, automatically selects a matching communication mode based on the signal mode and strength of various wireless base stations in the current environment. It then establishes a communication connection with the wireless base station with the strongest signal strength in the same mode to access the GSM-R network or the public mobile communication network. After successful communication connection, the vehicle-mounted device 1 can communicate with the ground receiving device 3 to achieve wireless transmission of real-time vehicle data. When the vehicle-mounted device 1 is in manual communication selection mode, the main control unit 11 controls the switching to a specified communication mode: either the GSM-R module 121 or the public network mobile communication module 122, to access the GSM-R network or the public mobile communication network, enabling wireless mobile communication between the device and the ground receiver.

[0075] When the vehicle-mounted device 1 selects the public network mobile communication mode, the main control unit 11, based on the signal strength of the currently selected wireless base station, first switches to the highest-level wireless communication mode via the public network mobile communication module 122. Simultaneously, it monitors the base station signal status in real time. If the currently selected wireless communication mode cannot achieve communication, it switches to the next lower-level network mode. These wireless communication modes include LTE, 3G, and 2G. Switching can be done in a downward direction, such as from LTE to 3G, 3G to 2G, or LTE to 2G. It can also switch in an upward direction, such as from 2G to 3G, 3G to LTE, or 2G to LTE. However, generally, base stations with higher-level network modes are compatible with lower-level network modes; therefore, downward switching is preferred.

[0076] Non-real-time wireless data transmission based on LAN WLAN

[0077] The vehicle-mounted equipment supports WLAN wireless digital communication. The wireless local area network data transmission has two working modes: one is the WLAN signal automatic search and connection submodule working mode, and the other is the wireless local area network routing submodule working mode.

[0078] When the on-board equipment 1 connects to a GSM-R network or a public mobile communication network, the WLAN_WIFI module 123 can automatically connect to the local area network (LAN) within the current railway section to construct a corresponding LAN data communication channel to complete the LAN-based transmission of non-real-time locomotive data. For example... Figure 4 As shown, the main control unit initializes by starting the kernel bootloader, loading the Open Wrt operating system, and reading the network configuration script wifi.sh. The main control unit then initializes the WLAN_WIFI module, which automatically searches for and connects to the wireless router's WIFI hotspot. The main control unit loads the wireless communication WLAN driver. Simultaneously, the main control unit configures routing and IP information for the WLAN_WIFI module. If the WLAN signal connection is successful, a corresponding local area network (LAN) data communication channel will be automatically established with the ground equipment, enabling the internal LAN transmission of large amounts of non-real-time data between the vehicle-mounted and ground equipment. If the WLAN connection fails to connect, the WLAN_WIFI module will periodically send connection requests. If the WLAN_WIFI module detects a WLAN signal and the LAN router providing access is a remembered account, it will automatically connect to the LAN; otherwise, it will continue to periodically send connection requests.

[0079] Alternatively, the local machine can be used as a local area network (LAN) router to create a new LAN, providing a wireless access hotspot (AP) for other devices within the LAN, enabling high-volume wireless digital communication between other communication terminals within the LAN and the local machine. For example... Figure 5 As shown, after the vehicle-mounted device is powered on, the main control unit initializes, which involves starting the kernel bootloader, loading the Open Wrt operating system, and reading the network configuration script ap.sh. The WLAN_WIFI module initializes and is initialized to wireless LAN router mode. The main control unit loads the wireless AP (Wireless LAN Access Point) driver, enables the wireless AP application, and provides AP hotspot connection services for other devices. When other devices initiate access requests, the WLAN_WIFI module dynamically assigns IP addresses and configuration information to the requesting devices according to the DHCP standard protocol and provides corresponding access services. After a successful connection, it enables the transmission of a large amount of non-real-time data between other access devices and this vehicle-mounted device within the local area network.

[0080] It should be stated that the above-described invention content and specific embodiments are intended to demonstrate the practical application of the technical solution provided by this invention and should not be construed as limiting the scope of protection of this invention. Those skilled in the art can make various modifications, equivalent substitutions, or improvements within the spirit and principles of this invention. The scope of protection of this invention is defined by the appended claims.

Claims

1. An onboard device for multi-network converged communication transmission on trains, characterized in that, The vehicle-mounted equipment (1) includes a main control unit (11), a wireless transmission unit (12), an interface unit (13), a storage unit (14), and a power supply unit (15); wherein, The wireless transmission unit (12) includes a GSM-R module (121), a public network mobile communication module (122), a WLAN_WIFI module (123), and a GPS / BDS satellite receiving module (124); The main control unit (11) is electrically and signal connected to the GSM-R module (121), the public network mobile communication module (122), the WLAN_WIFI module (123), and the GPS / BDS satellite receiving module (124), respectively, so that the main control unit (11) can realize real-time wireless data transmission through the GSM-R module (121) and the public network mobile communication module (122), realize non-real-time wireless data transmission through the WLAN_WIFI module (123), and receive satellite positioning data through the GPS / BDS satellite receiving module (124). The local geographical location information of the machine; the WLAN_WIFI module (123) includes a WLAN signal automatic retrieval and connection submodule and a wireless local area network routing submodule; the WLAN signal automatic retrieval and connection submodule automatically connects to the local area network inside the current railway section and builds a corresponding local area network data communication channel to complete the wireless transmission of non-real-time data of the locomotive; the wireless local area network routing submodule builds the local area network again based on the successful construction of the existing local area network data communication channel, and provides wireless access hotspots for other communication terminals to realize wireless data transmission between communication terminals in the wireless local area network; When the vehicle-mounted equipment (1) is in the automatic communication selection mode, the main control unit (11) automatically selects the matching communication mode according to the signal mode and strength status of each wireless base station in the current environment through the GSM-R module (121) and the public network mobile communication module (122), and establishes a communication connection with the wireless base station with the best signal strength in the same mode to access the GSM-R network or the public mobile communication network. After the communication connection is successful, the vehicle-mounted equipment (1) can communicate with the ground receiving equipment (3) to realize the wireless transmission process of real-time data of the locomotive. When the vehicle-mounted device (1) is in the manual selection communication mode, the main control unit (11) controls the jump to a specified communication mode: GSM-R module (121) or public network mobile communication module (122) to access the GSM-R network or public mobile communication network and realize wireless mobile communication between the device and the ground receiver. When the vehicle-mounted device (1) selects the public network mobile communication mode, the main control unit (11) first jumps to the highest level wireless communication mode according to the current selected wireless base station communication signal strength, and at the same time detects the base station signal status in real time. If the currently selected wireless communication mode cannot achieve communication, the next lower level network mode wireless communication mode is selected for jump. The wireless communication modes include LTE mode, 3G mode and 2G mode. When the vehicle-mounted equipment (1) accesses the GSM-R network or the public mobile communication network, the WLAN_WIFI module (123) can automatically connect to the local area network within the railway section where it is located, and build a corresponding local area network data communication channel to complete the local area network internal transmission process of the locomotive's non-real-time data; or use the local machine as a local area network router to build a new local area network, provide wireless access hotspots for other devices in the local area network, and realize large-volume wireless digital communication between other communication terminals in the wireless local area network and the local machine; The interface unit (13) includes a switch circuit (131), a controller circuit (132), and an interface circuit (133); The switch circuit (131) is electrically and signal connected to the main control unit (11) and multiple vehicle-mounted devices through an Ethernet interface, so that the switch circuit (131) provides Ethernet data exchange between the main control unit (11) and multiple vehicle-mounted devices; the switch circuit (131) expands the network ports by cascading two switch chips. The controller circuit (132) is electrically and signal-connected to the main control unit (11) via Ethernet communication. The controller circuit (132) is electrically and signal-connected to the switch circuit (131) via the Ethernet interface. The UART serial port of the controller circuit (132) is electrically and signal-connected to multiple vehicle-mounted devices via the RS422 level conversion circuit, so that the controller circuit (132) can realize the protocol conversion of RS422 serial port data and Ethernet interface data for high-speed data communication between the main control unit (11) and multiple vehicle-mounted devices. The interface circuit (133) consists of multiple RS422 interfaces and Ethernet interfaces to enable high-speed data communication between the main control unit (11) and multiple vehicle-mounted devices with RS422 interfaces or Ethernet interfaces. The storage unit (14) is electrically and signal connected to the main control unit (11) so that the fault record files, event record files and log record files of various vehicle-mounted devices received by the main control unit (11) can be transmitted to the storage unit (14) for storage. The power supply unit (15) provides the locomotive with a DC110V power supply, and through the DC110V to DC13.8V power module, it provides the main control unit (11), wireless transmission unit (12), interface unit (13) and storage unit (14) with a DC13.8V working voltage.

2. The on-board equipment for train multi-network converged communication transmission as described in claim 1, characterized in that, The main control unit (11) includes a primary main control and a backup main control. The primary main control and the backup main control are connected by serial port electrical connection and signal connection to realize hot backup operation mode. During normal operation, the primary main control transmits operation records and maintenance logs to the backup main control in real time to realize data synchronization function. When the primary main control fails, it automatically switches to the backup main control to continue the work task and sends fault alarm information to the ground dispatch center.

3. The on-board equipment for train multi-network converged communication transmission as described in claim 1, characterized in that, The main control unit (11) is electrically and signal connected to the WLAN_WIFI module (123) through serial communication to set the parameters of the WLAN_WIFI module (123); the main control unit (11) is electrically and signal connected to the WLAN_WIFI module (123) through the Ethernet interface to perform data communication.

4. The on-board equipment for train multi-network converged communication transmission as described in claim 1, characterized in that, The vehicle-mounted equipment (1) realizes the PSE power supply function through the AC220V to DC48V regulated power supply module and the PSE power controller circuit, and realizes the functions of detecting, classifying, current limiting and load disconnection detection of the powered equipment.

5. The on-board equipment for train multi-network converged communication transmission as described in claim 1, characterized in that, The vehicle-mounted equipment (1) interacts with the vehicle-mounted equipment (2) of each business system through an RS422 interface or an Ethernet interface; the vehicle-mounted equipment (1) interacts with the ground receiving equipment (3) through a GSM-R module (121), a public network mobile communication module (122), or a WLAN_WIFI module (123); the ground receiving equipment (3) interacts with the ground access gateway (4) through an Ethernet network; the ground receiving equipment (3) is deployed in EMU depots, locomotive depots, and stations. The ground access gateway (4) is interconnected with the business control center equipment (5) via Ethernet to exchange information. The ground access gateway (4) is deployed in the safety production network.

6. The on-board equipment for train multi-network converged communication transmission as described in claim 5, characterized in that, The ground receiving equipment (3) includes an M-GRIS data forwarding server, an MTUP security platform, and a WLAN data forwarding server; The vehicle-mounted equipment (1) accesses the GSM-R network through the GSM-R module (121) and interacts with the ground access gateway (4) in real time via the M-GRIS data forwarding server; The vehicle-mounted equipment (1) accesses the public mobile communication network through the public network mobile communication module (122) and interacts with the ground access gateway (4) in real time via the MTUP security platform; The vehicle-mounted equipment (1) accesses the railway private network WLAN through the WLAN_WIFI module (123) and performs non-real-time information interaction with the ground access gateway (4) via the WLAN data forwarding server.

7. A method for implementing multi-network converged communication transmission using onboard equipment for train multi-network converged communication transmission as described in any one of claims 1-6, characterized in that, The multi-network converged communication transmission implementation method includes: When the vehicle-mounted equipment (1) is in the automatic communication selection mode, the main control unit (11) automatically selects the matching communication mode according to the signal mode and strength status of each wireless base station in the current environment through the GSM-R module (121) and the public network mobile communication module (122), and establishes a communication connection with the wireless base station with the best signal strength in the same mode to access the GSM-R network or the public mobile communication network. After the communication connection is successful, the vehicle-mounted equipment (1) can communicate with the ground receiving equipment (3) to realize the wireless transmission process of real-time data of the locomotive. When the vehicle-mounted device (1) is in the manual selection communication mode, the main control unit (11) controls the jump to a specified communication mode: GSM-R module (121) or public network mobile communication module (122) to access the GSM-R network or public mobile communication network and realize wireless mobile communication between the device and the ground receiver. When the vehicle-mounted device (1) selects the public network mobile communication mode, the main control unit (11) first switches to the highest level wireless communication mode according to the current selected wireless base station communication signal strength, and at the same time detects the base station signal status in real time. If the currently selected wireless communication mode cannot achieve communication, then the next level network mode wireless communication mode is selected for switching. The wireless communication modes include LTE mode, 3G mode and 2G mode.

8. The multi-network converged communication transmission implementation method as described in claim 7, characterized in that, When the vehicle-mounted equipment (1) accesses the GSM-R network or the public mobile communication network, the WLAN_WIFI module (123) can automatically connect to the local area network within the railway section where it is located, and build a corresponding local area network data communication channel to complete the local area network transmission process of the locomotive's non-real-time data; or it can use the local machine as a local area network router to build a new local area network, provide wireless access hotspots for other devices in the local area network, and realize large-volume wireless digital communication between other communication terminals in the wireless local area network and the local machine.

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