A locomotive broadband data access device based on a core board and an implementation method thereof

Abstract

A kind of core board-based locomotive broadband data access equipment and implementation method belong to subway wireless communication technical field.Working process as follows: after the linux system of core board starts, load hard disk, drive LTE broadband data module and 5G NR broadband data module to carry out frequency search and cell search, in the defined working frequency band authentication registration, establish special bearing, then continuously detect network, realize the LTE broadband data module and 5G NR broadband data module of equipment simultaneously running online state.Greatly improve the data volume of bearing communication service, greatly improve the real-time of communication.

Description

Technical Field

[0001] This invention relates to a locomotive broadband data access device and its implementation method based on a core board, belonging to the field of subway wireless communication technology. Background Technology

[0002] In the field of rail transit communication, digital trunking systems are gradually being replaced by China's independently developed LTE system. The CBTC communication services carried by this system provide information for the automatic control of locomotives, assist the signaling system in ensuring safe train operation, and the PIS system communication services provide passengers with a more convenient and safer travel environment. Thanks to continuous performance improvements, 5G devices (especially wireless modules) have been widely used in the communication field, such as remote monitoring equipment, smart measurement equipment, wireless CPEs, wireless routers, and switches. Existing locomotive data access equipment generally uses LTE communication systems, with bandwidth limited to 20MHz. Due to this bandwidth limitation, multiple communication services require multiple data access devices. For example, CBTC services use a separate access device, while CCTV and PIS services use a single device, but the transmission of video information from video surveillance cameras cannot exceed two channels. Summary of the Invention

[0003] In view of the current state of equipment and the insufficient communication bandwidth, this invention provides a locomotive broadband data access device and implementation method based on a core board to meet the multi-service and high-speed requirements of urban rail transit wireless communication. Each locomotive can complete CBTC, CCTV and PIS services through only one access device of this invention, and can upload video information from more than 12 video surveillance cameras, meeting the requirement of uploading monitoring information from two cameras in each carriage.

[0004] To achieve the above objectives, the technical solution adopted by this invention is: a method for implementing a locomotive broadband data access device based on a core board, the workflow of which is as follows: after the Linux system of the core board starts up, it loads the hard disk, drives the LTE broadband data module and the 5G NR broadband data module to perform frequency search and cell search, authenticates and registers in the limited working frequency band, establishes a dedicated bearer, and then continuously detects the network to achieve the simultaneous online operation of the LTE broadband data module and the 5G NR broadband data module of the device;

[0005] The core board drives the LTE broadband data module and the 5G NR broadband data module by including a USB serial port driver and a USB NDIS network card driver. The LTE broadband data module and the 5G NR broadband data module are virtualized into several virtual serial ports, ttyUSB0 to ttyUSB5. Then, the CDC_NCM virtual network card is opened and bound to one of these virtual serial ports, creating a virtual network card. The core board's CPU sends AT commands to the LTE broadband data module and the 5G NR broadband data module through the virtual serial ports to complete the dial-up network access, signal reception, transmission, and status reporting of the LTE broadband data module and the 5G NR broadband data module.

[0006] The network detection process is as follows: After the system issues the registration command, wait 5 seconds and check if the WAN port exists. If the WAN port exists, return to the 5-second wait step; if the WAN port does not exist (i.e., it is not in the registration state), execute the DHCP (Dynamic Host Configuration Protocol) program to reassign an IP address to the WAN port via DHCP, enabling it to dial up and connect to the internet. Check the received signal strength. If there is no signal or the signal strength is very weak, below the receiving sensitivity of the wireless module, increment the hardware restart counter by 1. Check if the hardware restart counter value is ≥3. If the hardware restart counter value is ≥3, restart the broadband wireless module, reset the hardware restart counter to zero, and increment the software restart counter by 1; if the hardware restart counter value is <3, return to the 5-second wait step. After the broadband wireless module hardware restarts, if the software restart counter value is ≥3, restart the broadband wireless module; if the software restart counter value is <3, return to the 5-second wait step. LTE broadband data module and 5G... When registered, the NR broadband data module operates in the frequency band or cell configured by the core board, receiving wireless signals from the ground. The demodulated data is sent to the core board through the data interface. The core board forwards this data through the external network port according to the IP number carried by the data. The LTE broadband data module and the 5G NR broadband data module modulate the data sent by the core board and transmit it through the antenna port. The ground equipment receives this signal through the antenna, completing the wireless communication between the ground and the locomotive.

[0007] A locomotive broadband data access device based on a core board includes a core board, a hard disk, an LTE broadband data module, a 5G NR broadband data module, and a power supply unit. The core board is connected to the hard disk, the LTE broadband data module, and the 5G NR broadband data module, respectively. The power supply unit provides power to the hard disk, the LTE broadband data module, and the 5G NR broadband data module. The core board is model FET1046A-C and is used for system control and data forwarding. The LTE broadband data module is model GD225 or EM360 and is used as the terminal of the device, supporting both FDD LTE and TD-LTE LTE standards. The 5G NR broadband data module is model RM500U or MT5700M and is used for accessing the 5G network. The hard disk is model CSI128GR and is used for storing log files. The power supply unit is model UMRQ075ECP1501G and is used for power conversion, converting 110V power to 15V to power the device.

[0008] The technical advantages of this invention are as follows: This invention employs a core board with high-speed data processing capabilities and powerful routing functions. This core board's rich interfaces and internal resources support the operation of two broadband wireless modules. The LTE broadband wireless module is responsible for communication services in the LTE-M private network, while the 5G NR broadband wireless module is responsible for communication services within the 5G frequency band. Therefore, in addition to carrying existing communication services, it can also support newly added communication services. For example, the function of a vehicle-mounted wireless communication radio: a call from the vehicle can be converted into a digital signal through the control box of the onboard wireless communication radio, uploaded to the control center through the access device, and the fixed radio in the control center receives this information and responds. The response information is downloaded to the control box through this device, converted into voice, and completes voice communication.

[0009] Currently, automated driving of subway trains is a developing trend, which requires vehicles to interact with other vehicles, roadside equipment, and the management center in real time. This device allows the train to upload its location and status information in real time, thereby assisting the vehicle's automated control system in achieving precise control of the locomotive. The device is equipped with a 5G NR broadband wireless module, enabling 5G communication with the ground, and video monitoring information from inside the locomotive can be uploaded to the control center at any time.

[0010] This invention increases the communication bandwidth of the locomotive access equipment from 20MHz to 200MHz, the maximum transmission rate from 100Mbps to 1000Mbps, and the latency from 50ms to 1ms, thereby significantly increasing the amount of data carried for communication services and greatly improving the real-time performance of communication, making it capable of handling communication services with high real-time requirements. Attached Figure Description

[0011] Figure 1 The circuit connection block diagram for implementing the present invention;

[0012] Figure 2 This is a flowchart of the network detection process of the present invention. Detailed Implementation

[0013] like Figure 1 As shown, a locomotive broadband data access device based on a core board includes a core board, a hard disk, an LTE broadband data module, a 5G NR broadband data module, and a power supply unit.

[0014] The core board, acting as the central control unit and data processing unit of the entire device, drives the hard drive, LTE broadband data module, and 5G NR broadband data module, and communicates with them. It manages the establishment, maintenance, and disconnection of network connections, as well as data transmission. Employing Network Address Translation (NAT) technology, it forwards IP packets from external devices (vehicle-mounted switches or CBTC devices) to the corresponding broadband data modules based on their destination IP addresses. Simultaneously, it forwards data sent from the broadband data modules to the corresponding external devices (vehicle-mounted switches or PIS devices) based on their destination IP addresses. According to program requirements, the core board stores necessary logs, such as application performance logs (AP logs), on the hard drive. These logs record various events, errors, warnings, and performance data that occur during application operation, helping developers quickly locate problems and optimize performance. The LTE broadband data module and 5G NR broadband data module dial into the network according to the frequency band or cell configured by the core board, receiving wireless signals from the ground. The demodulated data is sent to the core board through its data interface. The core board then forwards this data through its external network interface according to the IP address carried by the data. The NR broadband data module also modulates the data sent from the core board and transmits it through the antenna port. Ground equipment receives this signal through the antenna, completing wireless communication between the ground and the locomotive.

[0015] The core board, model FET1046A-C, is used for system control and data forwarding. It's an industrial-grade core board based on the NXP LS1046A processor, integrating a CPU, power management, DDR RAM, eMMC ROM, and other components to form a minimal system for CPU and operating system operation. All CPU function pins are exposed via a COME connector. It has a maximum clock speed of 1.8GHz, uses a quad-core Cortex-A72 architecture, and natively supports eight Gigabit Ethernet ports to meet the high-concurrency data processing requirements of multiple network ports, with a maximum data throughput of 10Gbps. The core board is used for system control, data forwarding, driving the hard drive, LTE broadband wireless module, and 5G NR broadband data module, and interacting with these modules.

[0016] The hard drive serves as a storage device for the device's work logs. It is an industrial-grade serial ATA (SATA) hard drive, model CSI128GR, connected to the core board via a miniPCIE interface. It has a capacity of 128GB and is based on NAND flash memory storage technology. It conforms to the Serial ATA standard interface and is suitable for data storage.

[0017] As the terminal of the locomotive's broadband data access equipment, the broadband data module provides a wireless data interface for the equipment, completing the air interface data transmission function. Broadband data modules are mainly divided into two categories according to their operating frequency: LTE broadband data modules and 5G NR broadband data modules, operating in LTE and 5G systems respectively. LTE broadband data modules connect to the core board via a miniPCIE interface, while 5G NR broadband data modules connect via an M.2 interface. The LTE broadband data module model is GD225 or EM360, operating in the LTE-M band of subway wireless communication with a bandwidth of 20MHz. The LTE broadband data module is used for LTE-M network access and wireless data transmission and reception. Internally, the LTE broadband data module includes baseband processing circuits, digital signal modulation / demodulation circuits, and radio frequency circuits, possessing functions such as channel encoding / decoding, source encoding / decoding, digital signal modulation, and radio frequency signal demodulation. It can achieve a maximum downlink speed of 100Mbps and a maximum uplink speed of 50Mbps, providing customers with high-speed internet access and wireless data access.

[0018] The 5G NR broadband data module, model RM500U or MT5700M, operates on the 5G frequency band. It supports 5G frequency band access and completes broadband data transmission and reception. The module includes baseband processing circuitry, radio frequency circuitry, power management circuitry, and storage circuitry. It possesses functions such as channel encoding / decoding, source encoding / decoding, digital signal modulation, and radio frequency signal demodulation, and is used for accessing 5G networks.

[0019] Example 1, the workflow is as follows: The device of this invention is applied to a subway car. After the device is powered on, the Linux system on the core board starts, loads the hard disk, and drives the LTE broadband data module and the 5G NR broadband data module. The driver for the broadband data module includes a USB serial port driver and a USB NDIS network card driver, which virtualizes the broadband data module into several virtual serial ports such as ttyUSB0 to ttyUSB5 (AT commands). Then, the CDC_NCM virtual network card is opened and bound to one of the virtual serial ports, thus creating a virtual network card. The CPU of the core board sends AT commands to the LTE broadband data module and the 5G NR broadband data module through these virtual serial ports to complete the dial-up network access, signal reception, transmission, and reporting of the module's working status for the LTE broadband data module and the 5G NR broadband data module.

[0020] To ensure reliable network communication, network testing is performed during normal device operation to maintain the device's online status. The network testing process is as follows:

[0021] like Figure 2 As shown, after the system issues the registration command, it waits 5 seconds to check if the WAN port exists. If the WAN port exists, it returns to the 5-second wait step; if the WAN port does not exist (i.e., it is not in the registration state), it executes the DHCP (Dynamic Host Configuration Protocol) program to reassign an IP address to the WAN port via DHCP, enabling it to dial up and connect to the internet. It then checks the signal strength. If there is no signal or the signal strength is very weak, below the wireless module's receiving sensitivity, the hardware restart counter is incremented by 1. It checks if the hardware restart counter value is ≥3. If the hardware restart counter value is ≥3, the broadband wireless module is restarted, the hardware restart counter is reset to zero, and the software restart counter is incremented by 1; if the hardware restart counter value is <3, it returns to the 5-second wait step. After the broadband wireless module hardware restarts, if the software restart counter value is ≥3, the broadband wireless module is restarted via software; if the software restart counter value is <3, it returns to the 5-second wait step.

[0022] When registered, the LTE broadband data module and the 5G NR broadband data module operate in the frequency band or cell configured by the core board, receiving wireless signals from the ground. The demodulated data is sent to the core board through the data interface. The core board forwards this data through the external network port according to the IP number carried by the data. The LTE broadband data module and the 5G NR broadband data module also modulate the data sent from the core board and transmit it through the antenna port. Ground equipment receives this signal through the antenna, completing the wireless communication between the ground and the locomotive.

[0023] The hard drive is loaded by the core board. As the system runs, it generates AP log files and CP log files. Depending on the device's log saving format, the corresponding log files are written to the hard drive.

Claims

1. A method for implementing a locomotive broadband data access device based on a core board, characterized in that: The locomotive broadband data access equipment includes a core board, a hard disk, an LTE broadband data module, a 5G NR broadband data module, and a power supply unit. The core board is connected to the hard disk, the LTE broadband data module, and the 5G NR broadband data module, respectively. The power supply unit provides power to the hard disk, the LTE broadband data module, and the 5G NR broadband data module. The core board is model FET1046A-C and is used for system control and data forwarding. The LTE broadband data module is model GD225 or EM360 and is used as the terminal of the equipment, supporting both FDD LTE and TD-LTE LTE standards. The 5G NR broadband data module is model RM500U or MT5700M and is used for accessing the 5G network. The hard disk is model CSI128GR and is used for storing log files. The power supply unit is model UMRQ075ECP1501G and is used for power conversion, converting 110V power to 15V to power the equipment. The workflow is as follows: After the Linux system on the core board boots up, it loads the hard disk, drives the LTE broadband data module and the 5G NR broadband data module to perform frequency search and cell search, authenticates and registers in the limited working frequency band, establishes a dedicated bearer, and then continuously detects the network to achieve the simultaneous online operation of the device's LTE broadband data module and 5G NR broadband data module. The core board drives the LTE broadband data module and the 5G NR broadband data module by including a USB serial port driver and a USB NDIS network card driver. The LTE broadband data module and the 5G NR broadband data module are virtualized into several virtual serial ports, ttyUSB0 to ttyUSB5. Then, the CDC_NCM virtual network card is opened and bound to one of these virtual serial ports, creating a virtual network card. The core board's CPU sends AT commands to the LTE broadband data module and the 5G NR broadband data module through the virtual serial ports to complete the dial-up network access, signal reception, transmission, and status reporting of the LTE broadband data module and the 5G NR broadband data module. The network detection process is as follows: After the system issues the registration command, wait 5 seconds and check if the WAN port exists. If the WAN port exists, return to the 5-second wait step; if the WAN port does not exist (i.e., it is not in the registration state), execute the DHCP (Dynamic Host Configuration Protocol) program to reassign an IP address to the WAN port via DHCP, enabling it to dial up and connect to the internet. Check the received signal strength. If there is no signal or the signal strength is very weak, below the receiving sensitivity of the wireless module, increment the hardware restart counter by 1. Check if the hardware restart counter value is ≥3. If the hardware restart counter value is ≥3, restart the broadband wireless module, reset the hardware restart counter to zero, and increment the software restart counter by 1; if the hardware restart counter value is <3, return to the 5-second wait step. After the broadband wireless module hardware restarts, if the software restart counter value is ≥3, restart the broadband wireless module; if the software restart counter value is <3, return to the 5-second wait step. LTE broadband data module and 5G... When registered, the NR broadband data module operates in the frequency band or cell configured by the core board, receiving wireless signals from the ground. The demodulated data is sent to the core board through the data interface. The core board forwards this data through the external network port according to the IP number carried by the data. The LTE broadband data module and the 5G NR broadband data module modulate the data sent by the core board and transmit it through the antenna port. The ground equipment receives this signal through the antenna, completing the wireless communication between the ground and the locomotive.

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