A wireless communication vehicle-ground two-way communication system

Abstract

A wireless communication vehicle-ground two-way communication system and method, belonging to the field of vehicle-ground wireless communication technology, including a wired network ring network, a wireless network, and also including interconnected wireless servers and wireless trackside access boxes arranged on the trackside, and also including interconnected on-board wireless units, on-board monitoring panels and on-board antennas arranged on the vehicle, the on-board antennas are connected to the trackside wireless network signals, the on-board wireless units and on-board antennas are respectively arranged at the front and rear of the vehicle, the on-board wireless units at the front and rear of the vehicle are respectively associated with APs on two wireless security networks, the on-board wireless units at the front and rear of the vehicle are connected via head-to-tail through-network cables, each on-board wireless unit includes interconnected on-board AP modules, switch boards and ATP subsystems, and the ATP subsystems are connected to the vehicle-mounted host. The present invention utilizes two-way data communication equipment between the train and the ground to realize a fully protected two-way train operation mode.

Description

Technical Field

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

[0002] The existing subway system has ATP / ATO functions such as overspeed protection for online train operation, interval protection, over-advancing signal protection, door protection, linkage with safety doors at station platforms, automatic operation and precise parking.

[0003] In the existing subway system, only trains are allowed to use each route. An active balise is installed in front of the signal at the beginning of the route. The balise detects the voltage and current in the lighting circuit of the signal to determine the display of the signal, and selects the corresponding balise message to send to the train accordingly. When the train passes through the active balise, it obtains the display status of the signal and related movement authorization information, and guides the driver or ATO equipment to control the operation of the train.

[0004] The existing subway system adopts the route block driving control method, and the route adopts the signal to the forward signal. The interlocking equipment needs to check the vacancy of all sections in the route, the position and locking of the turnout, the status of the hostile signal, the red light filament status of the terminal signal, etc. In addition, it is necessary to check the vacancy and locking status of the protection section inside the terminal signal before opening the route start signal. The length and number of protection sections need to be finally determined through ATP calculation. The communication between the vehicle and the ground is slow, the rate of exchanged information is low, the amount of communication information is small, and the amount of information provided to the vehicle by the ground is low, resulting in a low vehicle travel rate and a large operating time interval. Summary of the invention

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a wireless communication system and method for two-way train-ground communication, which utilizes two-way data communication equipment between the train and the ground to realize a fully protected two-way train operation mode.

[0006] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0007] A wireless two-way communication system between trains and grounds, including a wired network ring consisting of a backbone network and switches set up in each station and depot, and a wireless network consisting of interconnected wireless controllers, switches and AP devices.

[0008] It also includes a wireless server and a wireless trackside access box that are connected to each other and are arranged on the trackside. The wireless trackside access box is connected to the wireless safety network, and the wireless trackside access box is provided with an AP module that is connected to the wireless safety network.

[0009] It also includes interconnected on-board wireless units, on-board monitoring panels and on-board antennas installed on the vehicle. The on-board antennas are connected to the trackside wireless network signals. The on-board wireless units and on-board antennas are each provided with a set at the front and rear of the vehicle. The on-board wireless units at the front and rear of the vehicle are respectively associated with APs on two wireless security networks. The on-board wireless units at the front and rear of the vehicle are connected via a head-to-tail through-network cable. Each on-board wireless unit includes interconnected on-board AP modules, switch boards and ATP subsystems. The ATP subsystem is connected to the on-board host.

[0010] Furthermore, the wired network covers the control center, backup control center, stations, depots, maintenance centers, and test lines.

[0011] Furthermore, the wireless network covers the main line, return line, storage line, entry and exit lines, vehicle depot / parking lot throat area, parking lot inspection depot, and test line area.

[0012] Furthermore, one wireless trackside access box is configured with two AP modules, corresponding to two different wireless safety networks respectively, and one wireless trackside access box is configured with two sets of directional antennas connected to different wireless safety networks.

[0013] Further, the onboard wireless unit detects at least connection with signals sent by two wireless trackside access boxes at any point on the track.

[0014] Furthermore, each vehicle-mounted wireless unit is provided with a vehicle-mounted AP module, two switch boards and two ATP subsystems, each switch is connected to one of its own ATP subsystems, and the switch at the front of the vehicle is connected to the switch at the rear of the vehicle one by one.

[0015] Furthermore, each AP device has a separate physical address.

[0016] The communication method of the vehicle-ground two-way communication system using the wireless communication is adopted. Any on-board wireless unit detects the signals sent by at least two wireless trackside access boxes at any point on the track. When the on-board wireless unit moves from the coverage range of one AP to the coverage range of the next AP, switching occurs. The inter-zone switching of the on-board wireless unit includes the processes of association, disconnection and re-association. Each on-board wireless unit on the train can only be associated with one wireless trackside access box at a time. The train completes the switching when it runs in the overlapping area of ​​adjacent APs. The on-board AP module of the on-board wireless unit obtains the wireless signal through the on-board antenna and transmits the information to its own switch. The switch transmits the information to its own ATP subsystem. The switches at the front and rear of the train exchange information through the end-to-end network cables.

[0017] Furthermore, the association is that during the roaming process, the on-board wireless unit initiates contact with the next AP. When the on-board wireless unit scans a signal from a wireless trackside access box, it initiates a search request, and after receiving a response, it sends an association request. After authentication is passed, the association is completed.

[0018] The disconnection means that after the on-board wireless unit is associated with the wireless trackside access box, the on-board wireless unit detects that the signal strength of the currently associated wireless trackside access box does not meet the communication requirements, and detects that the signal of another wireless trackside access box meets the requirements, and disconnects the association with the current wireless trackside access box, or detects that the current signal does not meet the association conditions and disconnects directly.

[0019] The re-association occurs when the onboard wireless unit establishes a connection with a new wireless trackside access box or a wireless trackside access box that has been previously connected.

[0020] Furthermore, the vehicle-mounted AP-A module at the front of the vehicle obtains the wireless signal through the vehicle-mounted antenna and passes the information to its own switch A1, and the switch A1 passes the information to its own ATP-A1 system. At the same time, the switch A1 passes the information to the switch A2 at the rear of the vehicle through the network cable, and the switch A2 at the rear of the vehicle passes the information to the ATP-A2 system at the rear of the vehicle; the vehicle-mounted AP-B module at the rear of the vehicle obtains the wireless signal through the vehicle-mounted antenna and passes the information to its own switch B2, and the switch B2 passes the information to its own ATP-B2 system. At the same time, the switch B2 passes the information to the switch B1 at the front of the vehicle through the network cable, and the switch B1 at the front of the vehicle passes the information to the ATP-B1 system at the front of the vehicle.

[0021] The beneficial effects of the present invention are:

[0022] The wireless communication vehicle-ground two-way communication system and method of the present invention, by setting up a wired network and a wireless network, a wireless trackside access box is set up on the trackside, and a vehicle-mounted wireless unit is set up at the front and rear of the vehicle. One vehicle-mounted wireless unit detects the signals sent by at least two wireless trackside access boxes. The front and rear of the vehicle transmit information through a network cable to realize two-way data communication between the train and the ground, and realize a fully protected two-way operation mode of the train, which can maximize the line transportation efficiency and the passenger comfort, and realize the automation of driving command and train operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A block diagram of the vehicle-ground two-way communication system of the present invention;

[0024] Figure 2 A schematic diagram of a wireless network of the present invention;

[0025] Figure 3 This is a schematic diagram of the backbone transmission network of the present invention;

[0026] Figure 4 This is a schematic diagram of the connection between the wireless trackside access box and the antenna of the present invention;

[0027] Figure 5 It is a schematic diagram of the cross-zone switching between the vehicle-mounted wireless unit and the wireless trackside access box of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the vehicle-mounted equipment in the present invention.

[0029] Markings in the figure: 1 is the wireless trackside access box, 2 is the vehicle-mounted wireless unit, 2-1 is the AP-A module, 2-2 is the switch A1, 2-3 is the switch B1, 2-4 is the ATP-A1 system, 2-5 is the ATP-B1 system, 2-6 is the AP-B module, 2-7 is the switch A2, 2-8 is the switch B2, 2-9 is the ATP-A2 system, 2-10 is the ATP-B2 system, 3 is the vehicle-mounted antenna, and 4 is the end-to-end network cable. DETAILED DESCRIPTION

[0030] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0031] like Figure 1 As shown, the present invention is a wireless communication vehicle-to-ground two-way communication system and method, including a data communication vehicle-to-ground two-way communication system composed of three parts, including a wired network, a wireless network and a vehicle-to-ground two-way communication system maintenance and management equipment.

[0032] The wireless communication vehicle-ground two-way communication system of the present invention includes a wired network composed of a backbone network and an access switch, wherein the backbone network is independently networked by a signal professional. The backbone network is combined with an Ethernet switch to form the entire wired network. The vehicle-ground two-way communication system network provides a dedicated wired information transmission service for the signal system, provides a transparent transmission channel for information between the control center, the backup control center, the station, and the maintenance center, and provides a local area network connection for the signal equipment of the control center, the backup control center, the station, the vehicle depot, the maintenance center, and the test line.

[0033] like Figure 2 As shown, the wireless network coverage line area of ​​the present invention includes: wireless controller, switch and AP equipment. Wireless coverage is achieved in the main line, return line, storage line, entry and exit line, vehicle depot / parking lot throat area, parking train inspection warehouse, test line and other areas.

[0034] The wireless network uses directional antennas to achieve two-way communication between the vehicle and the ground. It is based on the ISM 2.4GHz open frequency band and utilizes proprietary industrial-grade wireless device components and standardized, modular wired hardware equipment to form a high-availability wireless network that complies with universal wireless transmission protocols. The wireless communication technology adapts to the speed target value and operating environment of urban rail transit and is easy to upgrade and maintain.

[0035] The vehicle-ground two-way communication system is equipped with a trackside wireless server and a vehicle-mounted monitoring board, which is connected to the vehicle-mounted wireless unit 2 to monitor and record the received data.

[0036] like Figure 3 As shown, the backbone network sets up nodes at each station and depot to form a ring network.

[0037] Taking a subway line as an example, an optional backbone network topology diagram is shown. The backbone network is flexible and easy to expand, and the networking method can be adjusted according to actual on-site needs.

[0038] like Figure 4 The figure shows the connection diagram between the wireless trackside access box and the antenna. In the entire vehicle-ground two-way communication system, the bandwidth bottleneck is mainly concentrated in the vehicle-ground two-way transmission system, that is, the wireless link between the trackside wireless access point and the on-board wireless access unit. Refer to previous engineering experience and test results. The general principle of setting up the wireless trackside access box is that the on-board wireless unit TRU can detect the signals sent by at least two wireless trackside access boxes at any point on the track.

[0039] The wireless trackside access box of the vehicle-ground wireless network is redundant. Two AP modules are configured in one wireless trackside access box, corresponding to two different wireless safety networks. Two sets of directional antennas connected to different wireless safety networks are configured at one wireless trackside access box.

[0040] The on-board wireless unit and antenna are redundant. A set of on-board wireless units and antennas are installed at the front and rear of the vehicle respectively. Trackside wireless network signals are sent / received through the wireless antenna on the roof. The wireless units at the front and rear of the vehicle are respectively associated with the APs on the two wireless security networks for sending / receiving data.

[0041] like Figure 5 As shown in FIG. 1 , it is a schematic diagram of the inter-zone handover of the present invention. Since the data carried by the two-way communication system between the train and the ground is directly related to the driving safety, it is required that the wireless link should not be interrupted even when the train is running at high speed. When the on-board wireless unit moves from the coverage of one AP to the coverage of the next AP, a handover will occur. The wireless handover operation between cells is automatic and transparent to the train operation.

[0042] During the switching period, the onboard wireless unit loses connection with the AP, i.e., the communication is interrupted, which is unacceptable for train operation, especially high-speed train operation. To avoid any possible data loss during the switching process, the switching time needs to be less than 100ms. The present invention adopts a fast switching method in the wireless system:

[0043] The handover of TRU (Train-mounted Radio Unit) is a series of association, disconnection and reassociation processes. During roaming, the vehicle-mounted radio unit is responsible for initiating contact with the next AP. When the vehicle-mounted radio unit scans the signal of a wireless trackside access box, it starts a search request, and after receiving a response, it sends an association request. After authentication, the association is completed.

[0044] Disassociation means that after the TRU is associated with a wireless trackside access box, when the TRU detects that the signal strength of the currently associated wireless trackside access box does not meet the communication requirements, and detects that the signal of another wireless trackside access box meets the requirements, it disconnects from the current wireless trackside access box, or detects that the current signal does not meet the association conditions and disconnects directly.

[0045] Reassociation occurs when a TRU establishes a connection with a new wireless trackside access box or a wireless trackside access box that it has previously associated with.

[0046] Each TRU on the train can only be associated with one wireless trackside access box at a time to ensure it maintains only one connection to the network.

[0047] That is to say, all switching-related processing will be completed when the train runs in the overlapping area of ​​adjacent APs, and the size of the overlapping area should be designed according to the full speed of the train, and the inter-zone switching time is "zero".

[0048] like Figure 6 As shown, it is a schematic diagram of the structure of the vehicle-mounted equipment in the present invention,

[0049] The vehicle data communication network consists of two sets of TRU equipment at the front and rear of the vehicle and a network cable running from head to tail. Each set of TRU contains two switch boards for exchanging data at the front and rear of the vehicle. The equipment communication uses the 802.3 Ethernet communication protocol. The network and information transmission process is as follows:

[0050] The vehicle-mounted wireless unit 2 receives the information exchanged between the vehicle and the ground sent by the AP in the wireless trackside access box 1 in the wireless network through the two vehicle-mounted antennas 3 at the front and rear. Figure 6For example, the network is divided into end A and end B. The on-board AP-A module 2-1 of the on-board wireless unit at the front of the vehicle at end A obtains the wireless signal through the on-board antenna and transmits the information to its own switch A1 2-2. The switch A1 2-2 transmits the information to its own ATP-A1 system 2-4. At the same time, the switch A1 2-2 transmits the information to the switch A2 2-7 at the rear of the vehicle at end B through the head-to-tail through-line cable 4. The switch A2 2-7 at the rear of the vehicle at end B transmits the information to the ATP-A2 system 2-9 at the rear of the vehicle at end B to realize information communication. The on-board AP-B module 2-6 of the on-board wireless unit at the rear of the vehicle at end B obtains the wireless signal at end B through the on-board antenna 3 and transmits the information to its own switch B2 2-8. The switch B2 2-8 transmits the information to its own ATP-B2 system 2-10. At the same time, the switch B2 2-8 transmits the information to the switch B1 2-3 at the front of the vehicle at end A through another head-to-tail through-line cable 4. The switch B1 at the front of the vehicle at end A 2-3 transmits the information to the ATP-B1 system 2-5 system at the A end of the front of the vehicle.

[0051] The method of the present invention can improve the line transportation efficiency and the passenger riding comfort to the maximum extent, and realize the automation of train command and train operation.

[0052] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A wireless vehicle-ground two-way communication system, characterized in that: It includes a wired network ring consisting of a backbone network and switches set up in each station and depot, and a wireless network consisting of interconnected wireless controllers, switches and AP devices. It also includes a wireless server and a wireless trackside access box that are connected to each other and are arranged on the trackside. The wireless trackside access box is connected to the wireless safety network, and the wireless trackside access box is provided with an AP module that is connected to the wireless safety network. It also includes an on-board wireless unit, an on-board monitoring board and an on-board antenna that are connected to each other and are arranged on the vehicle. The on-board antenna is connected to the trackside wireless network signal. The on-board wireless unit and the on-board antenna are respectively arranged at the front and rear of the vehicle. The on-board wireless units at the front and rear of the vehicle are respectively associated with APs on two wireless security networks. The on-board wireless units at the front and rear of the vehicle are connected via a head-to-tail through-network cable. Each on-board wireless unit includes an on-board AP module, a switch board and an ATP subsystem that are connected to each other. The ATP subsystem is connected to the on-board host. Any on-board wireless unit detects signals sent by at least two wireless trackside access boxes at any point on the track. Switching occurs when the on-board wireless unit moves from the coverage of one AP to the coverage of the next AP. The inter-zone switching of the on-board wireless unit includes the processes of association, disconnection and re-association. Each on-board wireless unit on the train can only be associated with one wireless trackside access box at a time. The train completes the switching when it runs in the overlapping area of ​​adjacent APs. The on-board AP module of the on-board wireless unit obtains the wireless signal through the on-board antenna and passes the information to its own switch. The switch passes the information to its own ATP subsystem. The switches at the front and rear of the train exchange information through the end-to-end network cables.

2. A wireless vehicle-ground two-way communication system as claimed in claim 1, characterized in that: The wired network covers the control center, backup control center, stations, depots, maintenance centers, and test lines.

3. A wireless vehicle-ground two-way communication system as claimed in claim 1, characterized in that: The wireless network covers the main line, return line, storage line, entry and exit lines, vehicle depot / parking lot throat area, parking lot inspection depot, and test line area.

4. A wireless vehicle-ground two-way communication system as claimed in claim 1, characterized in that: A wireless trackside access box is configured with two AP modules, corresponding to two different wireless safety networks respectively. A wireless trackside access box is configured with two sets of directional antennas connected to different wireless safety networks.

5. The wireless vehicle-ground two-way communication system as claimed in claim 1, characterized in that: The on-board wireless unit detects at least two wireless trackside access boxes at any point on the track.

6. A wireless vehicle-ground two-way communication system as claimed in claim 1, characterized in that: Each vehicle-mounted wireless unit is equipped with a vehicle-mounted AP module, two switch boards and two ATP subsystems. Each switch is connected to one of its own ATP subsystems, and the switch at the front of the vehicle is connected one by one with the switch at the rear of the vehicle.

7. A wireless vehicle-ground two-way communication system as claimed in claim 1, characterized in that: Each AP device has a unique physical address.

8. A wireless vehicle-ground two-way communication system as claimed in claim 1, characterized in that: The association is that during the roaming process, the on-board wireless unit initiates the contact with the next AP. When the on-board wireless unit scans the signal of a wireless trackside access box, it initiates a search request, and after receiving a response, it sends an association request. After the authentication is passed, the association is completed; The disconnection is when, after the on-board wireless unit is associated with the wireless trackside access box, the on-board wireless unit detects that the signal strength of the currently associated wireless trackside access box does not meet the communication requirements, and detects that the signal of another wireless trackside access box meets the requirements, and disconnects the association with the current wireless trackside access box, or detects that the current signal does not meet the association conditions and disconnects directly; the re-association is when the on-board wireless unit establishes a connection with a new wireless trackside access box or a wireless trackside access box that has been previously connected, and re-association occurs.

9. The wireless vehicle-ground two-way communication system as claimed in claim 1, characterized in that: The on-board AP-A module of the on-board wireless unit at the front of the vehicle obtains the wireless signal through the on-board antenna and passes the information to its own switch A1. Switch A1 passes the information to its own ATP-A1 system. At the same time, switch A1 passes the information to the switch A2 at the rear of the vehicle through the network cable. Switch A2 at the rear of the vehicle passes the information to the ATP-A2 system at the rear of the vehicle. The on-board AP-B module of the on-board wireless unit at the rear of the vehicle obtains the wireless signal through the on-board antenna and passes the information to its own switch B2. Switch B2 passes the information to its own ATP-B2 system. At the same time, switch B2 passes the information to the switch B1 at the front of the vehicle through the network cable. Switch B1 at the front of the vehicle passes the information to the ATP-B1 system at the front of the vehicle.

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