CN113411773B - Dual-network redundant device system and lane communication system - Google Patents
Dual-network redundant device system and lane communication system Download PDFInfo
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- CN113411773B CN113411773B CN202110698787.3A CN202110698787A CN113411773B CN 113411773 B CN113411773 B CN 113411773B CN 202110698787 A CN202110698787 A CN 202110698787A CN 113411773 B CN113411773 B CN 113411773B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
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- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
- H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
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Abstract
The invention discloses a dual-network redundant device system and a lane communication system, wherein the device system comprises: a PRP module; the packaging modules are respectively connected with the PRP module; when sending data, the PRP module is configured to copy first message data to be sent, and send the copied first message data to the encapsulation modules in a one-to-one correspondence manner, where each encapsulation module is configured to encapsulate the received first message data and send the encapsulated first message data to a target device; when receiving data, each encapsulation module is used for decapsulating second message data to be sent and sending the decapsulated second message data to the PRP module; and the PRP module is used for calculating all the received second message data according to a discarding algorithm to obtain the retained second message data and sending the retained second message data to the target equipment. The invention improves the reliability of vehicle-ground communication.
Description
Technical Field
The invention relates to the field of vehicle-ground communication of a rail transit signal system, in particular to a dual-network redundant device system and a lane communication system.
Background
At present, most of domestic rail transit adopts a CBTC (train automatic control based on communication) system, and compared with a traditional signal system adopting a fixed blocking mode, the CBTC system adopts a mobile blocking mode to realize higher operation efficiency. The train-ground wireless communication system of the CBTC system is a key system for realizing reliable communication of train control information between trains and grounds. The system realizes the bidirectional transmission of train control information between the vehicle and the trackside signal equipment based on communication, and the reliability of the vehicle-ground communication link is very important. The existing vehicle-ground communication is to access a wireless network through a WiFi network or an LTE network to form a single transmission link.
However, since the open environment of vehicle-ground communication has various wireless communication systems of different standards, the CBTC vehicle-ground wireless system is inevitably interfered by other wireless systems, and in severe cases, a communication link failure is caused, thereby affecting the availability of the whole CBTC system. And the existing train-ground communication system only supports a single-system wireless communication system, and cannot fully utilize the arranged or other available trackside wireless networks.
And the train-ground communication system does not have a selection mechanism of multilink data, and needs to be processed through application layer software, so that the processing process is complex, and under the condition that the network environment changes or an operator requires to change, the change needs to be carried out in a mode of modifying the application layer software, and the maintenance difficulty is high.
Disclosure of Invention
The invention aims to provide a dual-network redundant device system and a lane communication system, so as to achieve the purpose of improving the reliability of vehicle-ground communication.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
a dual-network redundant appliance system comprising: a PRP module; the packaging modules are respectively connected with the PRP module; when data is sent, the PRP module is configured to copy first message data to be sent, send the copied first message data to the encapsulation modules in a one-to-one correspondence manner, where each encapsulation module is configured to encapsulate the received first message data, and send the encapsulated first message data to a target device.
When receiving data, each encapsulation module is used for decapsulating second message data to be sent and sending the decapsulated second message data to the PRP module.
The PRP module is used for calculating all the received second message data according to a discarding algorithm to obtain the retained second message data and sending the retained second message data to the target device.
Preferably, the system further comprises three interface modules, including a first interface module, a second interface module and a third interface module; the number of the packaging modules is two;
the PRP module is connected with the target equipment by adopting the first interface module;
the first packaging module of the two packaging modules is connected with the target equipment by adopting the second interface module;
the second packaging module of the two packaging modules is connected with the target equipment by adopting the third interface module;
when data is sent, the PRP module copies first message data received from the first interface module to obtain two pieces of the first message data, adds a PRP identifier at the end of each piece of the first message data, and correspondingly sends the two pieces of the first message data added with the PRP identifier to the first encapsulation module and the second encapsulation module respectively;
each encapsulation module is used for adding an encapsulation identifier to the head of the received first message data so as to encapsulate the first message data, and sending the encapsulated first message data to the target device in a dual-network mode through the corresponding second interface module and the corresponding third interface module.
Preferably, when receiving data, the two encapsulation modules receive two second packet data from the target device through the corresponding second interface module and third interface module, and remove the encapsulation identifier of the corresponding second packet data, to decapsulate the corresponding second packet data, and transmit the decapsulated second packet data to the PRP module;
the PRP module is used for retaining the first arrived second message data through a discarding algorithm according to the received PRP identification information of the second message data, discarding the second arrived message data, removing the retained PRP identification of the second message data, and sending the second message data to the target device through the first interface module.
Preferably, the PRP identifier includes a packet length, a link number, a packet sequence number, and a PRP identification code.
Preferably, the encapsulation identifier includes an encapsulation outer ethernet header, an encapsulation outer IP header, a UDP packet header, an encapsulation identifier, a reserved bit, an encapsulation group number, and a reserved bit thereof.
Preferably, the PRP module and the plurality of packaging modules are integrated on an FPGA processor.
Preferably, each of the packaged modules is turned on or off as desired.
In another aspect, the present invention also provides a lane communication system comprising two dual-network redundant device systems as described above, wherein a first dual-network redundant device system is disposed beside a rail and a second dual-network redundant device system is disposed on a train;
the PRP module of the first dual-network redundant device system is connected with the trackside signal system;
the two encapsulation modules of the first dual-network redundant device system are respectively and correspondingly connected with the two encapsulation modules of the second dual-network redundant device system through a first train-ground communication link and a second train-ground communication link;
the PRP module of the second dual-network redundant device system is connected with the vehicle-mounted signal system;
the trackside signal system generates third message data, and the third message data is sequentially sent to the vehicle-mounted signal system through the first dual-network redundant device system, the first vehicle-ground communication link, the second vehicle-ground communication link and the second dual-network redundant device system;
and the vehicle-mounted signal system generates fourth message data, and the fourth message data is sequentially sent to the trackside signal system through the second dual-network redundant device system, the first vehicle-ground communication link, the second vehicle-ground communication link and the first dual-network redundant device system.
Preferably, the transmission processes of the third packet data and the fourth packet data are the same, and the transmission process of the fourth packet data is as follows:
the source equipment of the vehicle-mounted signal system sends fourth message data to the first interface module of the second dual-network redundant device system;
the PRP module of the second dual-network redundant device system receives the fourth packet data from the first interface module;
the PRP module of the second dual-network redundant device system copies the fourth message data to form a first part of fourth message data and a second part of fourth message data;
the PRP module of the second dual-network redundant device system adds a PRP identifier to the end of the first fourth packet data and forwards the end of the first fourth packet data to the first encapsulation module of the second dual-network redundant device system;
adding an encapsulation identifier to the head of the first part of the fourth message data by a first encapsulation module of the second dual-network redundant device system to form a first encapsulated message;
the first encapsulation module of the second dual-network redundant device system forwards the first encapsulation message to the second interface module of the first dual-network redundant device system through the second interface module of the second dual-network redundant device system and the first vehicle-ground communication link;
the second interface module of the first dual-network redundant device system forwards the first encapsulation message to the first encapsulation module of the first dual-network redundant device system;
the first encapsulation module of the first dual-network redundant device system decapsulates the first encapsulation message into a first message and forwards the first message to the PRP module of the first dual-network redundant device system;
the PRP module of the second dual-network redundant device system adds a PRP identifier to the end of the second fourth packet data and forwards the resulting data to a second encapsulation module of the second dual-network redundant device system;
a second encapsulation module of the second dual-network redundant device system adds an encapsulation identifier to the head of the second fourth message data to form a second encapsulation message;
the second encapsulation module of the second dual-network redundant device system forwards the second encapsulation message to the third interface module of the first dual-network redundant device system through the third interface module of the second dual-network redundant device system and the second train-ground communication link;
the third interface module of the first dual-network redundant device system forwards the second encapsulation message to the second encapsulation module of the first dual-network redundant device system;
the second encapsulation module of the first dual-network redundant device system decapsulates the second encapsulation message into a second message and forwards the second message to the PRP module of the first dual-network redundant device system;
the PRP module of the first dual-network redundant device system analyzes the PRP identification information of the first message and the second message;
the PRP module of the first dual-network redundant device system keeps the first message or the second message which comes first through a discarding algorithm, and then the PRP module discards the second message or the first message;
the PRP module of the first dual-network redundant device system removes the PRP identification of the first message or the second message, and forwards the PRP identification to the first interface module of the first dual-network redundant device system;
and the first interface module of the first dual-network redundant device system sends the first message or the second message to the trackside signal system.
The invention has at least one of the following advantages:
when the device system based on the PRP dual-network redundancy is used for sending data, the PRP module (parallel redundancy module) is used for realizing message copying so as to realize redundant transmission on the dual-network, the encapsulation module is used for realizing message encapsulation so as to shield the network type and the external information of vehicle-ground communication, when the data is received, the encapsulation module is used for realizing message de-encapsulation so as to shield the network type and the external information of the vehicle-ground communication, the PRP module is used for comparing the messages transmitted on the dual-network, and the messages are processed according to a discarding algorithm, so that the optimization aiming at the dual-network data is completed. The invention has the advantages of higher availability and reliability of vehicle-ground communication, stronger anti-interference performance and better transmission performance.
Specifically, the network availability of vehicle-ground communication is higher, and because a set of wireless link is added on each wireless network of the vehicle-ground communication, the redundant wireless links work simultaneously, and one wireless link is switched to the other wireless link in real time after a fault occurs, the dual-network vehicle-ground communication of the CBTC system is not influenced under the condition that a set of wireless system fails.
The network reliability of the train-ground communication is higher, the PRP module receives the messages which come first and discards the messages which come later, and the dual-network redundant communication mode can realize zero delay of network failure recovery and no frame loss in failure.
The PRP module conforms to IEC62439 specifications, can well communicate with other equipment conforming to the specifications, and is favorable for improving the compatibility of the equipment.
When the dual-network redundant communication is realized, the network interface of the upper layer software and the design thereof are not changed.
By adopting the packaging mode, the network system of the concrete vehicle-ground transmission network and the network internal design thereof can be shielded. If necessary, the encapsulation function can be turned off, and other PRP devices can be connected to the network.
Drawings
Fig. 1 is a block diagram of a dual-network redundant device system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a message data structure according to an embodiment of the present invention;
fig. 3 is a block diagram of a lane communication system according to an embodiment of the present invention.
Detailed Description
The dual-network redundant device system and the lane communication system according to the present invention will be described in detail with reference to the accompanying drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all drawn to a non-precise scale for the purpose of convenience and clarity only to aid in the description of the embodiments of the invention. To make the objects, features and advantages of the present invention more comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
As shown in fig. 1, the dual-network redundant device system provided in this embodiment includes: a PRP module 300; a plurality of encapsulation modules respectively connected to the PRP module 300; when sending data, the PRP module 300 is configured to copy first message data to be sent, send the copied first message data to the encapsulation modules in a one-to-one correspondence manner, where each encapsulation module is configured to encapsulate the received first message data, and send the encapsulated first message data to a target device.
When receiving data, each of the encapsulation modules is configured to decapsulate second packet data to be sent, and send the decapsulated second packet data to the PRP module 300.
The PRP module 300 is configured to calculate all the received second packet data according to a discarding algorithm to obtain the retained second packet data, and send the retained second packet data to the target device.
In this embodiment, a dual-network redundant device system further includes three interface modules, including a first interface module 201, a second interface module 202, and a third interface module 203; the package modules are two in this embodiment (a first package module 401 and a second package module 402).
The first interface module 201 connects the signal system 100 with the PRP module 300, and the signal system 100 is connected with a target device.
The first packaging module 401 is connected to the second interface module 202 and the PRP module 300 respectively;
the second encapsulation module 402 is respectively connected to the third interface module 203 and the PRP module 300;
the second interface module 202 is connected to a first vehicle-to-ground communication link 501, and the third interface module 203 is connected to a second vehicle-to-ground communication link 502.
When sending data, the PRP module 300 copies the first packet data received from the first interface module 201 to obtain two pieces of the first packet data, adds a PRP identifier at the end of each piece of the first packet data, and correspondingly sends the two pieces of the first packet data added with the PRP identifier to the first encapsulation module 401 and the second encapsulation module 402, respectively.
Each of the encapsulation modules (the first encapsulation module 401 and the second encapsulation module 402) is configured to add an encapsulation identifier to a header of the received first packet data, so as to encapsulate the first packet data, and send the encapsulated first packet data to the target device in a dual-network manner through the corresponding second interface module 202 and the corresponding third interface module 203.
When receiving data, the two encapsulation modules (the first encapsulation module 401 and the second encapsulation module 402) receive two second packet data from the target device through the corresponding second interface module 202 and the third interface module 203, remove the encapsulation identifier of the corresponding second packet data, decapsulate the corresponding second packet data, and transmit the decapsulated second packet data to the PRP module 300.
The PRP module 300 is configured to retain the second packet data that arrives first and the second packet data that arrives after discarding according to the received PRP identification information of the second packet data through a discarding algorithm, remove the PRP identification of the retained second packet data, send the second packet data to the signal system through the first interface module 201, and send the second packet data to a target device through the signal system.
As shown in fig. 2, the PRP identifier includes a packet length, a link number, a packet sequence number, and a PRP identifier.
The encapsulation identification comprises an encapsulation outer layer Ethernet header, an encapsulation outer layer IP header, a UDP message header, an encapsulation identification, a reserved bit, an encapsulation grouping number and a reserved bit thereof.
The PRP module and the packaging modules are integrated on the FPGA processor.
Therefore, the complexity is reduced by integrating the equipment by using the FPGA technology, the zero delay of the network fault recovery is finally realized, no frame is lost during the fault, and the network reliability is greatly improved.
In this embodiment, each of the encapsulation modules is turned on or off as needed to adapt to different networking architectures.
On the other hand, as shown in fig. 3, the present embodiment further provides a lane communication system, which includes two identical dual-network redundant device systems as described above, wherein the first dual-network redundant device system 601 is disposed beside the track, and the device disposed beside the track may be referred to as a trackside device for short, and the second dual-network redundant device system 602 is disposed on the train, and the device disposed on the train may be referred to as an on-board device for short.
The PRP module of the first dual-network redundant device system (trackside device) 601 is connected to the trackside signal system 101;
the two enclosure modules of the first dual-network redundant device system 601 are respectively connected to the two enclosure modules of the second dual-network redundant device system (in-vehicle device) 602 through the first vehicle-ground communication link 501 and the second vehicle-ground communication link 502.
The PRP module of the second dual-network redundant device system 602 is connected to the in-vehicle signal system 102;
the trackside signal system 101 generates third message data, and the third message data is sent to the vehicle-mounted signal system 102 sequentially through the first dual-network redundant device system 601, the first vehicle-ground communication link 501, the second vehicle-ground communication link 502, and the second dual-network redundant device system 602;
the vehicle-mounted signal system 102 generates fourth message data, and the fourth message data is sequentially transmitted to the trackside signal system 101 through the second dual-network redundant device system 602, the first vehicle-ground communication link 501, the second vehicle-ground communication link 502, and the first dual-network redundant device system 601.
In this embodiment, the transmission processes of the third message data and the fourth message data are the same, and the transmission process of the fourth message data is as follows:
the source device of the in-vehicle signal system 102 sends fourth message data to the first interface module of the second dual-network redundant device system 602;
the PRP module of the second dual-network redundant device system 602 receives the fourth packet data from the first interface module;
the PRP module of the second dual-network redundant device system 602 copies the fourth packet data to form a first copy of the fourth packet data and a second copy of the fourth packet data;
the PRP module of the second dual-network redundant device system 602 adds a PRP identifier to the end of the first fourth packet data and forwards the end of the first fourth packet data to the first encapsulation module of the second dual-network redundant device system 602;
adding an encapsulation identifier to the header of the first part of the fourth packet data by a first encapsulation module of the second dual-network redundant device system 602 to form a first encapsulated packet;
the first encapsulation module of the second dual-network redundant device system 602 forwards the first encapsulation packet to the second interface module of the first dual-network redundant device system 601 through the second interface module of the second dual-network redundant device system 602 and the first vehicle-ground communication link 501;
the second interface module of the first dual-network redundant device system 601 forwards the first encapsulation packet to the first encapsulation module of the first dual-network redundant device system 601;
the first encapsulation module of the first dual-network redundant device system 601 decapsulates the first encapsulation packet into a first packet, and forwards the first packet to the PRP module of the first dual-network redundant device system 601;
the PRP module of the second dual-network redundant device system 602 adds a PRP identifier to the end of the second fourth packet data and forwards the resulting end to the second encapsulation module of the second dual-network redundant device system 602;
a second encapsulation module of the second dual-network redundant device system 602 adds an encapsulation identifier to a header of the second fourth packet data to form a second encapsulated packet;
the second encapsulation module of the second dual-network redundant device system 602 forwards the second encapsulation packet to the third interface module of the first dual-network redundant device system 601 through the third interface module of the second dual-network redundant device system 602 and the second train-ground communication link 502;
the third interface module of the first dual-network redundant device system 601 forwards the second encapsulation packet to the second encapsulation module of the first dual-network redundant device system 601;
the second encapsulation module of the first dual-network redundant device system 601 decapsulates the second encapsulation packet into a second packet, and forwards the second packet to the PRP module of the first dual-network redundant device system 601;
the PRP module of the first dual-network redundant device system 601 analyzes the PRP identification information of the first packet and the second packet;
the PRP module of the first dual-network redundant device system 601 retains the first packet or the second packet that comes first through a discarding algorithm, and then discards the first packet or the second packet;
the PRP module of the first dual-network redundant device system 601 removes the PRP identifier of the first packet or the second packet first, and forwards the PRP identifier to the first interface module of the first dual-network redundant device system 601;
the first interface module of the first dual-network redundant device system 601 sends the first packet or the second packet to the trackside signal system 101, and forwards the first packet or the second packet to a corresponding target device through the trackside signal system 101.
When the device system based on the PRP dual-network redundancy provided by this embodiment sends data, the PRP module is used to implement message copy to implement redundant transmission on dual networks, the encapsulation module is used to implement message encapsulation to shield the network system and external information of vehicle-to-ground communication, when receiving data, the encapsulation module is used to implement message decapsulation to shield the network system and external information of vehicle-to-ground communication, the PRP module is used to compare messages transmitted on dual networks, and processing is performed according to a discarding algorithm, thereby completing optimization for dual-network data. The embodiment has the advantages of higher availability and reliability of vehicle-ground communication, stronger anti-interference performance and better transmission performance.
Specifically, the network availability of the vehicle-ground communication is higher, and because a set of wireless link is added on each wireless network of the vehicle-ground communication, the redundant wireless links work simultaneously, and one wireless link is switched to the other wireless link in real time after a failure, the dual-network vehicle-ground communication of the CBTC system is not influenced under the condition that one set of wireless system fails.
The network reliability of the train-ground communication is higher, the PRP module receives the messages which come first and discards the messages which come later, and the dual-network redundant communication mode can realize zero delay of network failure recovery and no frame loss in failure.
The PRP module conforms to the IEC62439 specification, can well communicate with other equipment conforming to the specification, and is favorable for improving the compatibility of the equipment.
The external double-network interface is provided, the internal equivalent one-way network interface is provided, and the network interface and the design of upper-layer software are not changed when the double-network redundant communication is realized.
By adopting the packaging mode, the network system of the concrete vehicle-ground transmission network and the network internal design thereof can be shielded. If necessary, the encapsulation function can be closed, and other PRP devices can be connected to the network.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
It should be noted that the apparatuses and methods disclosed in the embodiments herein can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments herein. In this regard, each block in the flowchart or block diagrams may represent a module, a program, or a portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments herein may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (6)
1. A dual-network redundant appliance system, comprising: a PRP module;
the packaging modules are respectively connected with the PRP module;
when sending data, the PRP module is used for copying first message data to be sent, and sending a plurality of copied first message data to the encapsulation module in a one-to-one correspondence manner respectively,
each packaging module is used for packaging the received first message data and sending the packaged first message data to second target equipment;
when receiving data, each encapsulation module is used for decapsulating second message data to be sent and sending the decapsulated second message data to the PRP module;
the PRP module is used for calculating all the received second message data according to a discarding algorithm to obtain the retained second message data and sending the retained second message data to first target equipment;
the three interface modules comprise a first interface module, a second interface module and a third interface module; the number of the packaging modules is two;
the PRP module is connected with the first target equipment by adopting the first interface module;
the first packaging module of the two packaging modules is connected with the second target device by adopting the second interface module;
a second packaging module in the two packaging modules is connected with the second target device through the third interface module;
when data is sent, the PRP module copies first message data received from the first interface module to obtain two pieces of the first message data, adds a PRP identifier at the end of each piece of the first message data, and correspondingly sends the two pieces of the first message data added with the PRP identifier to the first encapsulation module and the second encapsulation module respectively;
each encapsulation module is used for adding an encapsulation identifier to the head of the received first message data so as to encapsulate the first message data, and sending the encapsulated first message data to the second target device in a dual-network mode through the corresponding second interface module and the corresponding third interface module; when receiving data, the two encapsulation modules receive two second message data from the second target device through the corresponding second interface module and third interface module, remove the encapsulation identifier of the corresponding second message data, decapsulate the corresponding second message data, and transmit the decapsulated second message data to the PRP module;
the PRP module is used for retaining the first arrived second message data through a discarding algorithm according to the received PRP identification information of the second message data, discarding the second arrived second message data, removing the retained PRP identification of the second message data, and sending the second message data to the first target device through the first interface module; the encapsulation identification comprises an encapsulation outer layer Ethernet header, an encapsulation outer layer IP header, a UDP message header, an encapsulation identification, a reserved bit, an encapsulation grouping number and a reserved bit thereof.
2. The dual-network redundant device system of claim 1, wherein the PRP identification comprises a packet length, a link number, a packet sequence number, and a PRP identification code.
3. The dual-network redundant device system of claim 2, wherein the PRP module and a number of the encapsulation modules are integrated on an FPGA processor.
4. The dual-network redundant device system of claim 3, wherein each of the encapsulation modules is turned on or off as needed.
5. A roadway communication system, comprising two dual-network redundant device systems according to any one of claims 1 to 4, wherein a first dual-network redundant device system is disposed beside a rail, and a second dual-network redundant device system is disposed on a train;
the PRP module of the first dual-network redundant device system is connected with the trackside signal system;
the two encapsulation modules of the first dual-network redundant device system are respectively and correspondingly connected with the two encapsulation modules of the second dual-network redundant device system through a first train-ground communication link and a second train-ground communication link;
the PRP module of the second dual-network redundant device system is connected with a vehicle-mounted signal system;
the trackside signal system generates third message data, and the third message data is sent to the vehicle-mounted signal system through the first dual-network redundant device system, the first vehicle-ground communication link, the second vehicle-ground communication link and the second dual-network redundant device system in sequence;
and the vehicle-mounted signal system generates fourth message data, and the fourth message data is sequentially sent to the trackside signal system through the second dual-network redundant device system, the first vehicle-ground communication link, the second vehicle-ground communication link and the first dual-network redundant device system.
6. The lane communication system of claim 5, wherein the third message data and the fourth message data are transmitted in the same process, and the fourth message data is transmitted as follows:
the source equipment of the vehicle-mounted signal system sends fourth message data to the first interface module of the second dual-network redundant device system;
the PRP module of the second dual-network redundant device system receives the fourth packet data from the first interface module;
the PRP module of the second dual-network redundant device system copies the fourth message data to form a first part of fourth message data and a second part of fourth message data;
the PRP module of the second dual-network redundant device system adds a PRP identifier to the end of the first fourth packet data and forwards the end of the first fourth packet data to the first encapsulation module of the second dual-network redundant device system;
a first encapsulation module of the second dual-network redundant device system adds an encapsulation identifier to the head of the first fourth message data to form a first encapsulated message;
the first encapsulation module of the second dual-network redundant device system forwards the first encapsulation message to the second interface module of the first dual-network redundant device system through the second interface module of the second dual-network redundant device system and the first vehicle-ground communication link;
the second interface module of the first dual-network redundant device system forwards the first encapsulation message to the first encapsulation module of the first dual-network redundant device system;
the first encapsulation module of the first dual-network redundant device system decapsulates the first encapsulation message into a first message and forwards the first message to the PRP module of the first dual-network redundant device system;
the PRP module of the second dual-network redundant device system adds a PRP identifier to the end of the second fourth packet data and forwards the resulting data to a second encapsulation module of the second dual-network redundant device system;
adding an encapsulation identifier to the head of the second fourth message data by a second encapsulation module of the second dual-network redundant device system to form a second encapsulated message;
the second encapsulation module of the second dual-network redundant device system forwards the second encapsulation message to the third interface module of the first dual-network redundant device system through the third interface module of the second dual-network redundant device system and the second train-ground communication link;
the third interface module of the first dual-network redundant device system forwards the second encapsulation message to the second encapsulation module of the first dual-network redundant device system;
the second encapsulation module of the first dual-network redundant device system decapsulates the second encapsulation message into a second message and forwards the second message to the PRP module of the first dual-network redundant device system;
the PRP module of the first dual-network redundant device system analyzes the PRP identification information of the first message and the second message;
the PRP module of the first dual-network redundant device system reserves the first message or the second message which comes first through a discarding algorithm and then the second message or the first message is discarded;
the PRP module of the first dual-network redundant device system removes the PRP identification of the first message or the second message, and forwards the PRP identification to the first interface module of the first dual-network redundant device system;
and the first interface module of the first dual-network redundant device system sends the first message or the second message to the trackside signal system.
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