CN113973046B - Wired safety data network and train ground communication mobile blocking signal network for train operation station - Google Patents
Wired safety data network and train ground communication mobile blocking signal network for train operation station Download PDFInfo
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Abstract
The invention provides a wired safety data network of a train operation station and a train-ground communication mobile blocking signal network, wherein the wired safety data network comprises a first inter-station switch, a first network center switch, a second inter-station switch and a second network center switch, and each station in signal coverage of the train operation signal system is provided with a first inter-station switch and a second inter-station switch; constructing a first ring network based on a ring network formed by the first inter-station switch and the first network center switch, and constructing a second ring network based on a ring network formed by the second inter-station switch and the second network center switch; station data acquired by the first network center switch and the second network center switch are used for outputting double-network ground control signals of each station. The data network and the mobile blocking signal network provided by the invention realize the guarantee of data transmission reliability, the 4G upgrading of the system equipment also improves the communication rate and the communication capacity, and reduces the electromagnetic interference from a telecom company.
Description
Technical Field
The invention relates to the technical field of rail transit communication networks, in particular to a wired safety data network of a train operation station and a train-ground communication mobile blocking signal network.
Background
For the existing railway communication system, the existing fixed blocking equipment faces the overhaul period, the equipment failure rate is improved year by year, the transportation capacity of the existing fixed blocking equipment cannot meet the requirement of rapid increase of railway transportation capacity, and a train operation control system capable of guaranteeing system safety and effectively improving transportation capacity is urgently required to be upgraded, so that the actual problem of current transportation production is solved.
The freight railway generally adopts a digital mobile communication system based on GSM-R; with the continuous development of railway service, the requirements on the communication bearing capacity are higher and higher, and the GSM-R can not completely meet the development requirements of railway communication service bearing at present. The highest communication rate of GSM-R is only 114kbps, and the network is easily affected by electromagnetic interference of a telecom company due to the frequency band setting. There is an urgent need for a railway communication network that can increase a communication rate, and also, while securing the communication rate, secure reliability of data interaction.
Therefore, how to avoid the situations that the existing railway communication system has low communication rate and is easy to be interfered by electromagnetic interference of a telecom company and the reliability of data transmission during vehicle-to-ground communication is not guaranteed is still a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a wired safety data network of a train operation station and a train-ground communication mobile blocking signal network, which are used for solving the problems that the communication rate of the conventional railway communication system is low, electromagnetic interference of a carrier is easy to occur, and the reliability of data transmission during train-ground communication is not guaranteed.
The invention provides a wired safety data network of a train operation station, which comprises a first inter-station exchanger, a first network center exchanger, a second inter-station exchanger and a second network center exchanger, wherein,
The number of the first inter-station switches and the number of the second inter-station switches are preset, and each station in the signal coverage of the train operation signal system is provided with a first inter-station switch and a second inter-station switch;
Constructing a first ring network based on a ring network formed by the preset number of first inter-station switches and the first network center switch, and constructing a second ring network based on a ring network formed by the preset number of second inter-station switches and the second network center switch;
Station data acquired by the first network center switch and the second network center switch are used for outputting double-network ground control signals of each station.
According to the wired safety data network of the train operation station provided by the invention, the operation of the first looped network comprises the following steps:
A first main switch of the first ring network is selected based on a preset rule, and the first main switch is used for opening a standby path in the first ring network according to an index optimal rule when any path of the first ring network is detected to be faulty;
correspondingly, the operation of the second ring network comprises the following steps:
and selecting a second main switch of the second ring network based on the preset rule, wherein the second main switch is used for opening a standby path in the second ring network according to the index optimal rule when any path of the second ring network is detected to be faulty.
According to the wired safety data network of the train operation station provided by the invention, the standby access in the first ring network is opened according to the index optimal rule, and the wired safety data network comprises the following components:
Deleting fault break points, determining a first network index value when other paths in the first ring network are provided with break points, and selecting paths with optimal values in the first network index value to be provided with new break points to form a standby path;
correspondingly, the opening the standby path in the second ring network according to the index optimal rule comprises the following steps:
deleting the fault break point, determining a second network index value when other paths in the second ring network are provided with break points, and selecting a path with an optimal value in the second network index value to be provided with a new break point to form a standby path.
The invention also provides a train-ground communication mobile blocking signal network, which comprises any of the above-provided wired safety data network of the train operation station, a ground LTE (Long Term Evolution ) interface subsystem, an LTE core network and a vehicle-mounted LTE communication device,
The ground LTE interface subsystem is used for receiving the double-network ground control signal sent by the wired safety data network, sending the double-network ground control signal to the LTE core network in an isolated manner, and receiving a double-network train signal returned by the LTE core network;
The LTE core network is used for receiving the double-network ground control signal sent by the ground LTE interface subsystem, forwarding the double-network ground control signal to the vehicle-mounted LTE communication equipment in an isolated manner by adopting a 4G communication protocol, and receiving the double-network train signal returned by the vehicle-mounted LTE communication equipment;
The vehicle-mounted LTE communication equipment is used for receiving the ground control signal forwarded by the LTE core network and responding to a corresponding double-network train signal to return to the LTE core network;
The ground control signals of different networks in the double-network ground control signals are mutually isolated, and the train signals of different networks in the double-network train signals are mutually isolated.
According to the mobile blocking signal network for vehicle-ground communication provided by the invention, the ground LTE interface subsystem comprises a network connection device, a network security device and an access switching device, wherein,
The network connection device is used for receiving the double-network ground control signal sent by the wired safety data network, forwarding the double-network ground control signal to the network safety device, and receiving the double-network train signal returned by the network safety device;
The network security equipment is used for receiving the double-network ground control signal sent by the network connection equipment, sending the double-network ground control signal to the access switching equipment after security inspection, and receiving the double-network train signal returned by the access switching equipment;
the access switching equipment is used for receiving the double-network ground control signal sent by the network security equipment and forwarding the double-network ground control signal to the LTE core network, and also receiving the double-network train signal returned by the LTE core network.
According to the mobile blocking signal network for vehicle-ground communication provided by the invention, the network connection equipment receives the double-network ground control signal sent by the wired safety data network, and the mobile blocking signal network comprises the following specific components:
the network connection equipment receives the double-network ground control signal from the wired safety data network forwarded by the mobile block ground train control system;
the mobile blocking ground train control system comprises a first RBC (RBC) switch, a second RBC switch and a maintenance terminal, wherein the first RBC switch is used for receiving a first single-network ground control signal output by the first network center switch, the second RBC switch is used for receiving a second single-network ground control signal output by the second network center switch, and the maintenance terminal is used for collecting signals of the trackside equipment.
According to the vehicle-ground communication mobile blocking signal network provided by the invention, the network connection equipment is connected with the mobile blocking ground train control system in an Ethernet mode, and the connection interface adopts a standard FE interface.
According to the mobile blocking signal network for vehicle-to-ground communication, the access switching equipment is connected with the LTE core network in an Ethernet mode, and a standard FE interface is adopted as a connection interface.
According to the vehicle-to-ground communication mobile blocking signal network provided by the invention, the vehicle-mounted LTE communication equipment is also used for receiving the double-network ground control signal of the 4G communication protocol sent by the LTE core network, converting the double-network ground control signal into the double-network ground control signal of the 2G communication protocol and sending the double-network ground control signal to the vehicle-mounted controller VOBC;
the antenna feeder interface type in the vehicle-mounted LTE communication equipment is TNC mother head.
According to the vehicle-to-ground communication mobile blocking signal network provided by the invention, the vehicle-mounted LTE communication equipment is connected with the VOBC through the Ethernet, and the connection interface adopts a 4-core socket with the specification of M12 female D code.
The invention provides a wired safety data network of a train operation station and a train-ground communication mobile blocking signal network, wherein a first inter-station switch and a second inter-station switch are configured at each station in the signal coverage of the train operation signal system to form two ring networks to construct the wired safety data network, the wired safety data network extends along a line to form a redundant wired system of the whole train-ground communication mobile blocking signal network, the train-ground communication mobile blocking signal network also comprises a ground LTE interface subsystem, an LTE core network and a vehicle-mounted LTE communication device, the original ground LTE interface subsystem, the LTE core network and the vehicle-mounted LTE communication device are multiplexed and transformed under the condition that the wired safety data network is a redundant double network, a redundant train-ground communication system architecture is formed, a newly-increased wired signal network and a TD-LTE (Time Division Duplexing Long Term Evolution, time division duplex long-term evolution) network are designed to realize the continuous data communication between the rail side device and the vehicle-mounted device on a positive line, and the original wired communication is changed into the current 4G communication with high transmission capacity and the transmission protocol is improved. Therefore, the wired safety data network of the train operation station and the train-ground communication mobile blocking signal network provided by the invention realize the guarantee of data transmission reliability through double-network redundancy, correspondingly, 4G upgrading of equipment in the system also improves the communication rate and the communication capacity, and reduces the electromagnetic interference from a carrier.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a wired safety data network for a train operation station provided by the invention;
Fig. 2 is a schematic structural diagram of a vehicle-to-ground communication mobile blocking signal network provided by the invention;
fig. 3 is a schematic diagram of a ground LTE interface subsystem according to one embodiment of the present invention;
fig. 4 is a second schematic architecture diagram of a terrestrial LTE interface subsystem according to the present invention;
fig. 5 is a third schematic diagram of a terrestrial LTE interface subsystem according to the present invention;
fig. 6 is a schematic diagram of a specific structure of a mobile blocking signal network for vehicle-to-ground communication according to the present invention;
Fig. 7 is a schematic diagram of a communication process of signal equipment between different LTE access areas provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The existing railway communication system has the problems of low communication rate, easiness in electromagnetic interference of a carrier and no guarantee of data transmission reliability during train-ground communication. A wired security data network for a train operation station according to the present invention will be described with reference to fig. 1. Fig. 1 is a schematic structural diagram of a wired safety data network for a train operation station, which is provided in the present invention, as shown in fig. 1, and includes a first inter-station switch 101, a first hub switch 102, a second inter-station switch 103 and a second hub switch 104, wherein,
The number of the first inter-station switches 101 and the number of the second inter-station switches 103 are preset, and each station in the signal coverage of the train operation signal system is provided with one first inter-station switch 101 and one second inter-station switch 103;
Constructing a first ring network 105 based on a ring network formed by the preset number of first inter-station switches 101 and the first hub switch 102, and constructing a second ring network 106 based on a ring network formed by the preset number of second inter-station switches 103 and the second hub switch 104;
Station data collected by each of the first hub switch 102 and the second hub switch 104 is used to output a dual-network ground control signal of each station.
Specifically, the wired safety data network of the train operation station provided by the invention is taken as an important component of the whole train-ground communication mobile blocking signal network, and the performance index of the wired safety data network needs to meet the requirements of an automatic train control system. As shown in fig. 1, the existing equipment of the safe data network multiplexing line is built by the wired network part by adopting a double-ring station-separating jumper connection mode in consideration of the line characteristics, and the stations in linear distribution are connected in a ring mode, so that the switches configured on each station are connected with the switches configured on two adjacent stations, and point-to-point links exist, but the operation is always performed in a unidirectional mode, namely, the ring network does not form a ring completely, but a breakpoint exists, the network storm is guaranteed not to occur, the materials are saved, and the recovery time is shortened. It should be noted that, as shown in fig. 1, two switches in the same dashed frame are two switches configured on the same station, the switch indicated by the thick solid line in the dashed frame in fig. 1 is the first inter-station switch 101 in the first ring network 105, the switch indicated by the thin solid line in the dashed frame is the second inter-station switch 103 in the second ring network 106, the connection line between the switches in the first ring network 105 is also a thick solid line, the connection line between the switches in the second ring network 106 is a thin solid line, the first ring network 105 and the second ring network 106 are mutually independent, and the first inter-station switch and the second inter-station switch in each station respectively collect data of the rail side devices in the stations and then send the data to the corresponding network center switch through the paths in the respective ring networks so that the first network center switch 102 and the second network center output the ground control signals in the respective networks. It should be noted that, in the industry, two networks in the dual-network redundancy system are generally referred to as a red subnet and a blue subnet, that is, the red subnet corresponds to the first ring network, the blue subnet corresponds to the second ring network, and hardware and software of the wired safety data network of the train operation station are designed according to standardized function modules, where the wired safety data network adopts a red-blue dual-network redundancy architecture, and the red-blue subnets are isolated from each other.
The invention provides a wired safety data network of a train operation station, which is characterized in that a first inter-station switch and a second inter-station switch are configured at each station in signal coverage of a train operation signal system to form two ring networks to construct a wired safety data network, each station is governed by the connection of two redundant optical fiber backbone ring networks, a bidirectional interface machine is designed to realize isolation of a newly-added wired signal network and a TD-LTE network, and finally continuous bidirectional data communication between trackside equipment and vehicle-mounted equipment is realized on the positive line. Therefore, the wired safety data network of the train operation station provided by the invention realizes the guarantee of the data transmission reliability through double-network redundancy.
Based on the above embodiment, in the wired secure data network of the train operation station, the operation of the first ring network includes:
A first main switch of the first ring network is selected based on a preset rule, and the first main switch is used for opening a standby path in the first ring network according to an index optimal rule when any path of the first ring network is detected to be faulty;
correspondingly, the operation of the second ring network comprises the following steps:
and selecting a second main switch of the second ring network based on the preset rule, wherein the second main switch is used for opening a standby path in the second ring network according to the index optimal rule when any path of the second ring network is detected to be faulty.
Specifically, a main switch is elected through an algorithm in a single network, and the main switch is used for monitoring the running state of a ring network and determining a backup path. After the backup path is determined, the ring network is degenerated into a bus topology structure at the moment, and the network is in a normal state. Once a path on any ring network fails, the switches on the two sides of the line can immediately detect the interruption of the line and immediately send information to the main switch, the main switch opens a standby path and notifies all switches to relearn, and the network is normal after convergence. When any path of any ring network fails, the break points are beaten according to the index optimal rule, so that the beaten new break points can ensure the optimal network index of the ring network after updating the break points. Therefore, the embodiment of the invention provides the function of the main switch in the ring network and a specific mode of determining the standby path by the main switch.
Based on the above embodiment, in the wired safety data network of the train operation station, the opening the standby path in the first ring network according to the index optimization rule includes:
Deleting fault break points, determining a first network index value when other paths in the first ring network are provided with break points, and selecting paths with optimal values in the first network index value to be provided with new break points to form a standby path;
correspondingly, the opening the standby path in the second ring network according to the index optimal rule comprises the following steps:
deleting the fault break point, determining a second network index value when other paths in the second ring network are provided with break points, and selecting a path with an optimal value in the second network index value to be provided with a new break point to form a standby path.
Specifically, for the method of updating the backup path in the first ring network, namely deleting the original fault breakpoint in the ring network, finding out the update breakpoint under the condition of optimal preset network indexes, wherein the preset network indexes can be parameters which are commonly used for describing network quality, such as network delay, network jitter and the like; similarly, the second ring network is treated in this manner. The embodiment of the invention introduces the specific content of the index optimal rule in detail and gives various examples of using the index optimal rule.
Based on the above embodiment, the present invention further provides a vehicle-to-ground communication mobile blocking signal network, and a vehicle-to-ground communication mobile blocking signal network of the present invention is described below with reference to fig. 2 to 7. Fig. 2 is a schematic structural diagram of a vehicle-to-ground communication mobile blocking signal network provided by the present invention, as shown in fig. 2, where the vehicle-to-ground communication mobile blocking signal network includes a wired safety data network 201 of a train operation station, a ground LTE interface subsystem 202, an LTE core network 203, and a vehicle-mounted LTE communication device 204 according to any of the embodiments described above,
The ground LTE interface subsystem 202 is configured to receive a dual-network ground control signal sent by the wired secure data network 201, send the dual-network ground control signal to the LTE core network 203 in an isolated manner, and receive a dual-network train signal returned by the LTE core network 203;
The LTE core network 203 is configured to receive the dual-network ground control signal sent by the ground LTE interface subsystem 202, and transmit the dual-network ground control signal to the vehicle-mounted LTE communication device 204 in an isolated manner by using a 4G communication protocol, and receive the dual-network train signal returned by the vehicle-mounted LTE communication device 204;
The vehicle-mounted LTE communication device 204 is configured to receive the ground control signal forwarded by the LTE core network 203 and return to the LTE core network 203 in response to a corresponding dual-network train signal;
The ground control signals of different networks in the double-network ground control signals are mutually isolated, and the train signals of different networks in the double-network train signals are mutually isolated.
Specifically, the arrows between the modules in the train-ground communication mobile blocking signal network shown in fig. 2 include two double-headed arrows, wherein the double-headed arrow with a thin solid line indicates uploading station control signals collected by the first ring network (i.e., the red network) and downloading train signals returned by the vehicle-mounted LTE communication device 204, and the double-headed arrow with a thick solid line indicates uploading station control signals collected by the second ring network (i.e., the blue network) and downloading train signals returned by the vehicle-mounted LTE communication device 204, which do not interfere with each other, so as to transmit between the modules in the train-ground communication mobile blocking signal network in a multiplexing duplex mode. The core module in the vehicle-ground communication mobile blocking signal network is an LTE core network 203, the LTE core network 203 converts the dual-network ground control signal received from the ground LTE interface subsystem 202 from 2G to 4G, and then sends the first ground control signal collected in the first ring network and the second ground control signal collected in the second ring network to the vehicle-mounted LTE communication device 204 in a 4G communication protocol, where the vehicle-mounted LTE communication device 204 also adopts two feed antennas to receive the first ground control signal and the second ground control signal, processes the first ground control signal and the second ground control signal through a 4G to 2G protocol, and then forwards the first ground control signal and the second ground control signal to the vehicle-mounted device, such as VOBC, ATP, ATO, and the like. It should be noted that, the ground LTE interface subsystem 202 and the vehicle LTE communication device 204 are used as modules for directly communicating with the LTE core network 203 at two ends of the vehicle, and LTE interface devices, that is, multiplexing TD-LTE devices, are set in the ground LTE interface subsystem 202 and the vehicle LTE communication device 204, and a dedicated Access Point (APN) is used to access a network, perform packet encryption of information through dedicated software, and transmit the encrypted information through TD-LTE, decrypt the encrypted information at the opposite end, and forward the encrypted information to the connection interface system as needed.
The invention provides a train-ground communication mobile blocking signal network comprising a train operation station wired safety data network, wherein each station in the signal coverage of the train operation signal network is provided with a first inter-station switch and a second inter-station switch to form two ring networks to construct the wired safety data network, each station is connected with the other station through two redundant optical fiber backbone ring networks, the wired safety data network extends along a line to form a redundant wired system of the whole train-ground communication mobile blocking signal network, the train-ground communication mobile blocking signal network also comprises a ground LTE interface subsystem, an LTE core network and a vehicle-mounted LTE communication device, the original ground LTE interface subsystem, the LTE core network and the vehicle-mounted LTE communication device are multiplexed and modified under the condition that the wired safety data network is a redundant double network, a redundant train-ground communication system architecture is formed, a bidirectional interface machine is designed to realize the isolation between a newly-increased wired signal network and a TD-LTE network, and finally continuous bidirectional data communication is carried out between a trackside device and a vehicle-mounted device on the positive line, and the original wired communication protocol is changed into the existing 4G communication transmission protocol, and the data transmission capacity is greatly improved. Therefore, the train-ground communication mobile blocking signal network comprising the wired safety data network of the train operation station provided by the invention realizes the guarantee of data transmission reliability through double-network redundancy, correspondingly carries out 4G upgrading on equipment in the system, improves the communication rate and the communication capacity, and reduces the electromagnetic interference from a carrier.
Based on the above embodiment, in the vehicle-ground communication mobile blocking signal network, the ground LTE interface subsystem includes a network connection device, a network security device, and an access switching device, where,
The network connection device is used for receiving the double-network ground control signal sent by the wired safety data network, forwarding the double-network ground control signal to the network safety device, and receiving the double-network train signal returned by the network safety device;
The network security equipment is used for receiving the double-network ground control signal sent by the network connection equipment, sending the double-network ground control signal to the access switching equipment after security inspection, and receiving the double-network train signal returned by the access switching equipment;
the access switching equipment is used for receiving the double-network ground control signal sent by the network security equipment and forwarding the double-network ground control signal to the LTE core network, and also receiving the double-network train signal returned by the LTE core network.
Specifically, the ground LTE interface subsystem is composed of an application server, a storage server, a management maintenance terminal, a firewall, a network switching device, and the like, fig. 3 is one of the architecture diagrams of the ground LTE interface subsystem provided by the present invention, and the system architecture is shown in fig. 3, where the arrows between two adjacent modules in the network connection device 301, the network security device 302, and the access switching device 303 all include two double-headed arrows, where the double-headed arrow with a thin solid line indicates that the station control signal acquired by the first ring network (i.e. the red network) is uploaded and the train signal returned by the vehicle LTE communication device 204 is downloaded, the double-headed arrow with a thick solid line indicates that the station control signal acquired by the second ring network (i.e. the blue network) is uploaded and the train signal returned by the vehicle LTE communication device 204 is downloaded, so that the data transmission between the red-blue double networks in the ground LTE interface subsystem is further defined, and the data transmission between the modules in the ground LTE interface subsystem in a duplex mode is not interfered.
Based on the above embodiment, in the vehicle-ground communication mobile blocking signal network, the network connection device receives the dual-network ground control signal sent by the wired secure data network, and specifically includes:
the network connection equipment receives the double-network ground control signal from the wired safety data network forwarded by the mobile block ground train control system;
the mobile blocking ground train control system comprises a first RBC (RBC) switch, a second RBC switch and a maintenance terminal, wherein the first RBC switch is used for receiving a first single-network ground control signal output by the first network center switch, the second RBC switch is used for receiving a second single-network ground control signal output by the second network center switch, and the maintenance terminal is used for collecting signals of the trackside equipment.
Specifically, the ground LTE interface subsystem is composed of an application server, a storage server, a management maintenance terminal, a firewall, a network switching device, and the like, fig. 4 is a second schematic diagram of the architecture of the ground LTE interface subsystem provided by the present invention, and a specific system architecture is shown in fig. 4, where a mobile blocking ground LTE interface device cabinet 4 is newly provided in a machine room, and the cabinet size is 600×1000×2200mm, and is used for installing and deploying 8 sets of mobile blocking ground LTE interface devices; the dispatching room is newly provided with a mobile blocking ground LTE interface device management maintenance terminal 1. LTE network access of the communication server in fig. 4: the ground LTE interface equipment provides LTE network access for the mobile blocking application system and provides a transparent bidirectional data transmission channel between the mobile blocking application system and the vehicle-mounted terminal; and (3) data forwarding: the ground LTE interface equipment adopts a real-time forwarding mechanism to complete the bidirectional transmission of data between the mobile blocking application system and the vehicle-mounted terminal; addressing space conversion: the ground LTE interface equipment completes conversion of different addressing spaces between the mobile blocking application system and the LTE network through DNS domain name resolution. The data storage server in fig. 4 is used for storing log data, parsing basic information in service data, and storing application service raw data. The management maintenance terminal in fig. 4 is used for monitoring the equipment state, comprehensively inquiring service data, counting the service information forwarding success rate, flow and other statistical data of the mobile blocking application system according to conditions such as time, address and the like, and supporting data export. Fig. 5 is a third schematic diagram of the architecture of the ground LTE interface subsystem provided by the present invention, as shown in fig. 5, in the ground signal network, station data collected by the RBC server, CTC, and interlocking CI, etc. trackside devices of the red network and the blue network are sent to the LTE core network through the respective networks (red network and blue network). Fig. 6 is a schematic diagram of a specific structure of a mobile blocking signal network for vehicle-ground communication, as shown in fig. 6, a ground LTE interface device adopts a "dual-reception dual-transmission" communication mode, that is, a red-blue dual-network redundancy server in a mobile blocking application system simultaneously transmits data to a ground LTE interface device, and the ground LTE interface device simultaneously forwards data of a vehicle-mounted terminal to the red-blue dual-network redundancy server in the mobile blocking application system, and normally, the main ground LTE interface device bears all services. When the main ground LTE interface equipment fails, the standby ground LTE interface equipment bears all services; the master and standby ground LTE interface devices record logs. The data transmission between the mobile blocking application system and the vehicle-mounted terminal adopts an LTE wireless network data transmission mode. The data sent to the vehicle-mounted terminal by the mobile blocking application system is sent to the ground LTE interface device through the mobile blocking application server, and the data is forwarded to the vehicle-mounted terminal through the LTE network by the ground LTE interface device. The data sent to the mobile blocking application system by the vehicle-mounted terminal is forwarded to the mobile blocking application system by the ground LTE interface device through the LTE network and the ground LTE interface device. When the ground LTE interface equipment interacts data with the mobile blocking application system, the transmission layer adopts a UDP protocol, and the network layer adopts an IP protocol. When the vehicle-mounted terminal and the ground LTE interface equipment interact data, the transmission layer adopts a UDP protocol, and the network layer adopts an IP protocol. The LTE network and the mobile blocking signal network (the mobile blocking signal devices of the vehicle and the ground are logically considered to be in the same signal network) are mutually isolated, independent addressing spaces are respectively used, the signal network devices access the LTE network through LTE access devices (vehicle-mounted LTE communication devices and ground LTE interface devices) in the LTE access area, and network communication among the signal devices in different LTE access areas is realized through the LTE network. Fig. 7 is a schematic diagram of a communication process of signal devices between different LTE access areas provided by the present invention, where in the whole communication process shown in fig. 7, signal devices located in different LTE access areas are not directly addressed, but are in communication with a local LTE access device, and signal network addresses and ports of a source device, a target device, and an application data packet are sent to the local LTE access device, where the local LTE access device needs to complete addressing to the target LTE access device through DNS domain name address mapping according to a mapping relationship between the target device (represented by the signal network address of the target device) and the LTE access device, and send the signal network addresses and ports of the source device and the target device, and the application data packet to the target LTE access device. The target LTE access device that receives the data packet needs to fill in the packet header of the UDP protocol according to the signal network address of the target device described in the data packet, and send the source device, the signal network address and port of the target device, and the application data packet to the target device through the local signal network. The embodiment of the invention further defines the interaction mode between the network connection equipment and the wired safety data network, and specifically describes the structure of the mobile blocking ground train control system.
Based on the above embodiment, in the vehicle-ground communication mobile blocking signal network, the network connection device is connected with the mobile blocking ground train control system in an ethernet manner, and a standard FE interface is adopted as a connection interface.
In particular, the configuration of the interface of the network connection device and the mobile occlusion ground train control system when signals in the vehicle-ground communication mobile occlusion signal network are transmitted in the form of a wired circuit is further defined.
Based on the above embodiment, in the mobile blocking signal network for vehicle-to-ground communication, the access switching device is connected with the LTE core network in an ethernet manner, and a standard FE interface is used as a connection interface.
In particular, the interface configuration of the access switching equipment and the LTE core network when signals in the vehicle-to-ground communication mobile blocking signal network are transmitted in the form of a wired circuit is further defined.
Based on the above embodiment, in the vehicle-to-ground communication mobile blocking signal network, the vehicle-mounted LTE communication device is further configured to receive a dual-network ground control signal of a 4G communication protocol sent by the LTE core network, convert the dual-network ground control signal into a dual-network ground control signal of a 2G communication protocol, and send the dual-network ground control signal to a vehicle-mounted controller VOBC;
the antenna feeder interface type in the vehicle-mounted LTE communication equipment is TNC mother head.
Specifically, a first module in the vehicle-mounted LTE communication device is an antenna feeder, and a second module is a 4G-to-2G protocol module, so as to ensure that signals are replaced by 2G signals more suitable for wired circuit transmission. Wherein, the antenna feeder interface type is TNC female head, impedance 50Ω, table 1 is the antenna feeder line position definition (i.e. radio frequency connector definition) provided by the invention, table 1 is as follows:
Table 1 rf connector definition
Therefore, the embodiment of the invention specifically limits the physical parameters of the antenna feeder, and the key module receiving antenna in the vehicle-mounted LTE communication equipment is limited by the configuration physical parameters.
Based on the above embodiment, in the vehicle-to-ground communication mobile blocking signal network, the vehicle-mounted LTE communication device is connected with the VOBC through an ethernet, and the connection interface adopts a 4-core socket with a specification of M12 female D code.
Specifically, the ethernet interface for the vehicle LTE communication device to communicate with the VOBC device adopts a 4-core socket, the specification is M12 female D coding, table 2 is a line bit definition of the 4-core socket provided by the present invention, and table 2 is as follows:
line definition of a core socket for a watch 24
Therefore, the embodiment of the invention specifically limits physical parameters of the Ethernet interface for the communication between the vehicle-mounted LTE communication equipment and the VOBC equipment, and limits configuration physical parameters of the Ethernet interface for the communication between the key module vehicle-mounted LTE communication equipment in the vehicle-mounted LTE communication equipment and the VOBC equipment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A train-ground communication mobile blocking signal network system is characterized by comprising a train operation station wired safety data network subsystem, a ground LTE interface subsystem, an LTE core network and a vehicle-mounted LTE communication device, wherein,
The wired safety data network subsystem of the train operation station comprises a first inter-station switch, a first network center switch, a second inter-station switch and a second network center switch, wherein,
The number of the first inter-station switches and the number of the second inter-station switches are preset, and each station in the signal coverage of the train operation signal system is provided with a first inter-station switch and a second inter-station switch;
Constructing a first ring network based on a ring network formed by the preset number of first inter-station switches and the first network center switch, and constructing a second ring network based on a ring network formed by the preset number of second inter-station switches and the second network center switch;
Station data acquired by the first network center switch and the second network center switch are used for outputting a double-network ground control signal of each station;
wherein, the operation of first looped netowrk includes:
A first main switch of the first ring network is selected based on a preset rule, and the first main switch is used for opening a standby path in the first ring network according to an index optimal rule when any path of the first ring network is detected to be faulty;
correspondingly, the operation of the second ring network comprises the following steps:
A second main switch of the second ring network is selected based on the preset rule, and the second main switch is used for opening a standby path in the second ring network according to the index optimal rule when any path of the second ring network is detected to be faulty;
the opening the standby path in the first ring network according to the index optimal rule comprises the following steps:
Deleting fault break points, determining a first network index value when other paths in the first ring network are provided with break points, and selecting paths with optimal values in the first network index value to be provided with new break points to form a standby path;
correspondingly, the opening the standby path in the second ring network according to the index optimal rule comprises the following steps:
Deleting fault break points, determining a second network index value when other paths in the second ring network are provided with break points, and selecting paths with optimal values in the second network index value to be provided with new break points to form a standby path;
The ground LTE interface subsystem is used for receiving the double-network ground control signal sent by the wired safety data network, sending the double-network ground control signal to the LTE core network in an isolated manner, and receiving a double-network train signal returned by the LTE core network;
The LTE core network is used for receiving the double-network ground control signal sent by the ground LTE interface subsystem, forwarding the double-network ground control signal to the vehicle-mounted LTE communication equipment in an isolated manner by adopting a 4G communication protocol, and receiving the double-network train signal returned by the vehicle-mounted LTE communication equipment;
The vehicle-mounted LTE communication equipment is used for receiving the ground control signal forwarded by the LTE core network and responding to a corresponding double-network train signal to return to the LTE core network;
ground control signals of different networks in the double-network ground control signals are isolated from each other, and train signals of different networks in the double-network train signals are isolated from each other;
The ground LTE interface subsystem comprises a network connection device, a network security device and an access switching device, wherein,
The network connection device is used for receiving the double-network ground control signal sent by the wired safety data network, forwarding the double-network ground control signal to the network safety device, and receiving the double-network train signal returned by the network safety device;
The network security equipment is used for receiving the double-network ground control signal sent by the network connection equipment, sending the double-network ground control signal to the access switching equipment after security inspection, and receiving the double-network train signal returned by the access switching equipment;
the access switching equipment is used for receiving the double-network ground control signal sent by the network security equipment and forwarding the double-network ground control signal to the LTE core network, and also receiving the double-network train signal returned by the LTE core network.
2. The vehicle-to-ground communication mobile occlusion signal network system of claim 1, wherein said network connection device receives said two-network ground control signal sent by said wired secure data network, specifically comprising:
the network connection equipment receives the double-network ground control signal from the wired safety data network forwarded by the mobile block ground train control system;
the mobile blocking ground train control system comprises a first RBC (RBC) switch, a second RBC switch and a maintenance terminal, wherein the first RBC switch is used for receiving a first single-network ground control signal output by the first network center switch, the second RBC switch is used for receiving a second single-network ground control signal output by the second network center switch, and the maintenance terminal is used for collecting signals of the trackside equipment.
3. The vehicle-to-ground communication mobile occlusion signal network system of claim 2, wherein said network connection device is connected to said mobile occlusion ground train control system in an ethernet manner, and a standard FE interface is used as a connection interface.
4. A train-ground communication mobile block signal network system according to claim 3, wherein the access switching device is connected to the LTE core network in an ethernet manner, and a standard FE interface is used as a connection interface.
5. The mobile blocking signal network system for vehicle-to-ground communication according to claim 4, wherein the vehicle-mounted LTE communication device is further configured to receive a dual-network ground control signal of a 4G communication protocol sent by the LTE core network, convert the dual-network ground control signal into a dual-network ground control signal of a 2G communication protocol, and send the dual-network ground control signal to the vehicle-mounted controller VOBC;
the antenna feeder interface type in the vehicle-mounted LTE communication equipment is TNC mother head.
6. The vehicle-to-ground communication mobile blocking signal network system according to claim 5, wherein the ethernet connection between the vehicle-mounted LTE communication device and the VOBC is implemented by a 4-core socket with a specification of M12 female D code.
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