Wireless communication system of railway train control equipment

Abstract

The railway train control equipment wireless communication system is composed of railway train control equipment and wireless communication equipment connected with the railway train control equipment and comprises train control center equipment (CRS), train control station equipment (STC), train control trackside equipment (WSE) and train control vehicle-mounted equipment (OBE), and the wireless communication equipment comprises a ground base station (BS), a vehicle-mounted mobile station (MS) and a trackside portable station (PS). The BS and the CRS, the BS and the STC, the PS and the WSE, and the MS and the OBE adopt standard Ethernet interfaces to realize wired connection, the BS, the MS and the PS adopt a 400MHz digital wireless communication network to realize wireless connection, and mutual communication among the railway train control equipment CRS, the STC, the WSE and the OBE is realized. The method has the technical advantages that the mutual communication between the fixed train control equipment and the movable train control equipment, between the movable train control equipment and between the fixed train control equipment in the railway train control system is realized, and the train control train-ground information fusion control requirement is met.

Description

Technical Field

[0001] The present invention belongs to the field of railway train operation control, and particularly relates to a wireless communication system for railway train control equipment. Technical Background

[0002] The basic function of the train control system is to effectively ensure the safety of train operation without disturbing the normal driving of locomotive crew. It mainly consists of on-vehicle train control equipment and ground train control equipment. Among them, the ground train control equipment mainly includes central train control equipment, station train control equipment, and trackside train control equipment. During the process of train operation monitoring, according to functional requirements, train control information interaction between train control equipment such as between vehicle and ground or between vehicles is required to achieve integrated control of train control vehicle-ground information. There are various ways to transmit train control information between vehicle-ground or vehicle-vehicle equipment. Among them, the wireless communication method is flexible in technical means, has strong adaptability, and can meet the diverse needs of conventional railway transportation organization. At the same time, using wireless communication can achieve closed-loop transmission and control of train control information. Moreover, it has the advantages of simple system structure, high equipment integration, support for network architecture, and can achieve centralized control by the center, and is being more and more widely used. In view of the needs of conventional railway transportation safety and technological development, as well as the current coverage of railway wireless communication networks, researching to utilize the existing conventional railway wireless network to achieve wireless communication between train control equipment, interact train control messages, and complete the train operation monitoring function is an important technical basis for the development of future conventional railway train control systems.

[0003] The current railway wireless communication network mainly includes the GSM-R network and the train digital wireless dispatching communication system (DRTD) network that uses 400 MHz digital wireless technology. When a train operates on railway lines covered by different communication systems, the train control system should be able to adapt to different communication networks. For the sections of railway lines where the GSM-R network has been opened, the GSM-R wireless communication network is used; for the sections where the DRTD / 400M digital train dispatching has been opened, the existing network can be used or a new 400M digital wireless communication network can be established. The technology of using the GSM-R wireless communication network to achieve train control information interaction has been relatively mature and has been widely applied in various train control systems such as the CTCS-3 level train control system (using the circuit domain (CS)) and the high-speed rail ATO system (using the packet domain (PS)). However, the technology of using the 400 MHz digital wireless communication network to transmit train control information has not been applied in the field yet. The 400 MHz digital wireless dispatching communication system (DRTD system) that is currently under research and development in the industry is only applicable to transmitting information related to dispatching commands and has not been able to be used to transmit train control information. Compared with transmitting dispatching command information, transmitting train control information has more stringent requirements in terms of the reliability, security, and transmission efficiency (real-time performance) of information transmission. This has put forward the requirement for researching the technology of using the 400 MHz digital wireless network to achieve the transmission of train control information between train control devices such as between the vehicle and the ground or between vehicles, and it should be able to support the communication network architecture of train control devices based on IP, the communication should meet the train control security level requirements, and the efficiency and reliability of wireless transmission of train control messages should be guaranteed through design. Summary of the Invention

[0004] The present invention provides a wireless communication system for railway train control equipment, which realizes the requirement of efficiently and securely transmitting train control messages between the central equipment, station equipment, trackside equipment, and on-vehicle equipment of the train control system for ordinary-speed railways by using a 400 MHz digital wireless network.

[0005] The wireless communication system of the railway train control equipment consists of the railway train control equipment and the wireless communication equipment connected thereto. The train control equipment includes the train control center equipment (CRS, Center Radio Server), the train control station equipment (STC, STation Controller), the train control wayside equipment (WSE, WaySide Equipment), and the train control on-board equipment (OBE, OnBoard Equipment), where CRS, STC, and WSE are fixed train control equipment, and OBE is mobile train control equipment; the wireless communication equipment includes the ground base station (BS, Base Station), the on-board mobile station (MS, Mobile Station), and the wayside portable station (PS, Portable Station). Among them, the connections between BS and CRS, BS and STC, PS and WSE, and MS and OBE are realized by wired connections using standard Ethernet interfaces, and the wireless connections between BS, MS, and PS are realized by a 400 MHz digital wireless communication network, so as to realize the mutual communication between the train control equipment CRS, STC, WSE, and OBE; the communication interfaces of each train control equipment and wireless communication equipment are realized as follows: Interface ①, OBE—MS—wireless communication connection—BS—STC; Interface ②, OBE—MS—wireless communication connection—BS—CRS; Interface ③, OBE—MS - wireless communication connection - PS - WSE; Interface ④, WSE - PS - wireless communication connection - BS - STC; Interface ⑤, OBE - MS - wireless communication connection - MS - OBE.

[0006] Optionally, direct communication can be carried out between mobile train control devices by using the wireless communication equipment, or forwarded by using the wireless communication equipment connected to the fixed train control equipment.

[0007] The present invention also proposes a hierarchical structure of the communication protocol for the interface of railway wireless communication equipment. The communication protocol for the interface between the wireless communication equipment and the train control equipment adopts a 5-layer structure, including the first layer physical layer (PHY), the second layer data link layer (DLL), the third layer network layer (IP), the fourth layer transport layer (TCP / UDP), and the fifth layer session control layer (SCL, Session Control Layer). The communication protocol for the interface between the wireless communication equipment and the wireless communication equipment adopts a 4-layer structure, including the first layer physical layer (PL), the second layer data link layer (DLL), the third layer extended link layer (ELL, Extention Link Layer), and the fourth layer session control layer (SCL).

[0008] The present invention also provides a 400 MHz digital wireless communication channel model, which adopts the TDMA technology based on double time slots. The communication between wireless communication devices uses the single-frequency half-duplex communication mode, that is, a wireless communication device can simultaneously use two time slots of a single frequency point to respectively achieve half-duplex communication with two other wireless communication devices.

[0009] The present invention also provides a method for the wireless communication interaction process between train control devices, which adopts the "request-response" communication mode. Generally, the mobile train control device initiates a communication request according to the functional requirements of the train control system, and the fixed train control device responds according to the content of the request information. The train control devices and wireless communication devices are designed based on the IP networking architecture, and the mechanism of obtaining the IP address dynamically allocated by the ground through the wireless communication device of the mobile train control device and its interface realizes the transparent transmission of information between train control devices.

[0010] It can be seen from the above technical solutions that the wireless communication system for railway train control devices proposed by the present invention can realize the mutual communication between the railway train control center device (CRS), train control station device (STC), train control trackside device (WSE) and train control on-vehicle device (OBE) through the establishment of a wireless communication device ground base station (BS), on-vehicle mobile station (MS), and trackside portable station (PS), and utilize the 400 MHz wireless communication network to transmit train control-related information. The train control devices and wireless communication devices are designed based on the IP networking architecture, and the mechanism of obtaining the IP address dynamically allocated by the ground through the wireless communication device of the mobile train control device and its interface realizes the transparent transmission of information between train control devices. The communication protocol between wireless communication devices adopts a 4-layer structure. By establishing an extended link layer (ELL) to realize the dynamic selection of data protocols and the encryption of air interface communication data, the security and efficiency of data transmission are effectively improved; by establishing a session control layer (SCL) to realize protocols such as dynamic mapping of network IP addresses and communication connection management, the reliability of data transmission and stable connection are ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0012] Figure 1 It is a schematic diagram of the railway train control system architecture and wireless communication requirements;

[0013] Figure 2 It is a schematic diagram of the railway 400 MHz digital wireless communication system architecture;

[0014] Figure 3Schematic diagram of the protocol layering structure of the wireless communication device interface

[0015] Figure 4 Schematic diagram of the wireless communication channel model between the BS and the MS1 and MS2

[0016] Figure 5 Schematic diagram of the wireless communication process between the OBE and the STC

[0017] Figure 6 Schematic diagram of the wireless communication information encryption process between the OBE and the STC Specific implementation mode

[0018] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention. The embodiments are only illustrative and should not be construed as any form of limitation to the present invention. It should be pointed out that any deformation and improvement made by those skilled in the art without departing from the concept of the present invention fall within the protection scope of the present invention.

[0019] The wireless communication system of the railway train control equipment of the present invention is composed of railway train control equipment and a wireless communication device connected thereto, and mainly realizes the mutual communication between the fixed train control equipment and the mobile train control equipment, between the mobile train control equipment, and between the fixed train control equipment in the railway train control system to meet the requirements of train control vehicle-ground information fusion control. Figure 1 Schematic diagram of the railway train control system architecture and the wireless communication requirements between devices proposed in the embodiment of the present invention. The railway train control equipment in the system includes: train control center equipment (CRS), train control station equipment (STC), train control trackside equipment (WSE), and train control on-vehicle equipment (OBE). Among them, CRS, STC, and WSE are fixed train control equipment, and OBE is mobile train control equipment. The wireless communication requirements between the train control system devices include: Interface ①, communication between the OBE and the STC, which can be used to transmit station interlocking information, operation notice dispatching command information, train position information, train running speed information, train-related parameters, etc.; Interface ②, communication between the OBE and the CRS, which can be used to transmit station interlocking information, operation notice dispatching command information, train position information, train running speed information, train-related parameters, etc.; Interface ③, communication between the OBE and the WSE, which can be used to transmit trackside equipment signal status information, etc.; Interface ④, communication between the WSE and the STC, which can be used to transmit trackside equipment signal status information, etc.; Interface ⑤, communication between the OBE and the OBE, which can be used to transmit train position information, train running speed information, etc.

[0020] Optionally, the OBE communicates with the STC or CRS, and can also be used to interact with shunting protection-related information such as shunting operation notice, etc., to realize the ground-to-train information transmission function of shunting protection for railway main line locomotives and special shunting locomotives; optionally, the train control equipment can also transmit the train control equipment status information to each other to realize the real-time monitoring function of the train control equipment status; optionally, the OBE communicates with the OBE, and can also be used to interact the train integrity information between the front-end equipment and the rear-end equipment of the same train, etc.

[0021] In the present invention, the above interfaces ① to ⑤ of the railway train control equipment use the 400 MHz digital wireless communication network to realize the information interaction between the equipment. Figure 2 It is a schematic diagram of the wireless communication system architecture of the railway train control equipment proposed in the embodiment of the present invention. The wireless communication equipment in the system includes a ground base station (BS), a vehicle-mounted mobile station (MS), and a trackside portable station (PS). Among them, the CRS is connected to the BS through a wired interface, the STC is connected to the BS through a wired interface, the WSE is connected to the PS through a wired interface, and the OBE is connected to the MS through a wired interface; wireless communication connections are realized between the BS, the MS, and the PS, so as to realize the communication between the CRS, the STC, the WSE, and the OBE. As Figure 2 shown, the communication of each train control equipment interface is realized as follows: Interface ①, OBE-MS-wireless communication connection a-BS-STC; Interface ②, OBE-MS-wireless communication connection a-BS-CRS; Interface ③, OBE-MS-wireless communication connection b-PS-WSE; Interface ④, WSE-PS-wireless communication connection c-BS-STC; Interface ⑤, OBE-MS-wireless communication connection d-MS-OBE.

[0022] Optionally, the mobile train control equipment can directly communicate with each other by using wireless communication equipment such as Figure 2 shown, or forward through the wireless communication equipment connected to the fixed train control equipment. Taking the communication between the on-train control equipment 1 (OBE1) and the on-train control equipment 2 (OBE2) as an example, it can be relayed by the ground base station (BS), or directly communicate through Interface ③.

[0023] Optionally, the train control trackside equipment (WSE) can also send information such as the trackside signal status to other train control equipment in the form of wireless broadcast through the trackside portable station (PS).

[0024] Figure 3This is a schematic diagram of the hierarchical structure of the wireless communication device interface protocol proposed in the embodiments of the present invention. Among them, the data transmission between the train control device and the wireless communication device uses a standard Ethernet interface, the network layer uses the IP protocol, supports the networking of the IP network architecture, and the transport layer can use the TCP / UPD protocol to realize the data transmission of the train control application layer; the air interface communication between wireless communication devices uses the dual-slot time division multiple access technology, and the communication interface uses the extended DMR (Digital Mobile Radio) air interface to realize the connection of the 400 MHz wireless communication network and transmit the communication data of the train control device. As Figure 3 shown, the communication between the wireless communication device and the train control device uses a 5-layer protocol structure, including the first layer of the physical layer (PHY), the second layer of the data link layer (DLL), the third layer of the network layer (IP), the fourth layer of the transport layer (TCP / UDP), and the fifth layer of the session control layer (SCL). Among them, the physical layer, data link layer, network layer, and transport layer meet the requirements of the standard OSI reference model. The communication between wireless communication devices uses the extended DMR air interface and uses a 4-layer protocol structure, including the first layer of the physical layer (PL), the second layer of the data link layer (DLL), the third layer of the extended link layer (ELL), and the fourth layer of the session control layer (SCL). Among them, the physical layer (PL) is mainly used to process physical bursts (a continuous bit stream on the physical channel) and the bit construction of transceiver, and realize radio frequency functions such as signal modulation / demodulation and transceiver switching; the data link layer (DLL) is mainly used to process logical link connections, realize channel coding, data interleaving / deinterleaving, service access control and channel management, frame synchronization, etc.; the extended link layer (ELL) is mainly used to realize dynamic selection of data protocols and encryption of air interface communication data, etc.; the session control layer (SCL) is mainly used to realize network IP address mapping and communication connection management, etc.

[0025] The extended link layer (ELL) realizes the dynamic selection of data protocols, which means that according to the size of the data message received by the upper layer protocol, it judges and generates the message structure indication of the lower layer data link layer (DLL), and realizes that according to the actual data message size, it can dynamically select the CSBK (Control Signaling Block), MBC (Multi-Block Control Message) or PDP (Packet Data Packet) message structure to improve the data transmission efficiency. The extended link layer (ELL) realizes the encryption of air interface communication data, which means that it can interact with the other communication party according to the upper layer protocol indication to generate a session key (Ks), encrypt and decrypt the transmitted data, and use it to protect the data transmitted on the wireless channel to prevent unauthorized access, eavesdropping or tampering, so as to ensure the confidentiality and security of communication. Optionally, multiple key negotiation algorithms and encryption algorithms can be used to generate Ks; when the sending requestor disconnects the TCP connection to end this communication, Ks is released, and after re-establishing the communication connection next time, a new Ks is used in the interaction. Optionally, the extended link layer (ELL) realizes other supplementary services such as priority transmission right processing, by sending in the priority order agreed upon for each service in advance, etc.

[0026] The session control layer (SCL) mainly establishes dynamic IP address mapping, communication connection management, etc. The establishment of dynamic IP address mapping means that in the process of the initiating party of a communication connection establishing a communication connection with the receiving party, it not only includes the transmission of basic connection information, but also includes the process of the communication initiating party obtaining a dynamically allocated IP address from the receiving party. Once the initiating party successfully obtains the dynamic IP address allocated by the receiving party or the network, this dynamic IP address will immediately replace the previously used default IP address, thus completing the process of dynamic IP address mapping, as Figure 5 shown. Wireless communication connection management includes functions such as connection establishment, maintenance, and termination.

[0027] When the transport layer uses the UDP protocol, since it is connectionless-oriented transmission, the application layer is responsible for confirming the reliability of message transmission.

[0028] When the physical layer realizes communication between mobile train control devices, a 1 / 2 coding rate rule is preferably adopted; when realizing communication between fixed train control devices and mobile train control devices, a 1 / 2 coding rate, 3 / 4 coding rate, or full coding rate can be adopted, and the 1 / 2 coding rate is preferably used to improve the reliability of data wireless transmission.

[0029] Figure 4 This embodiment of the present invention proposes a 400 MHz digital wireless communication channel model, which adopts TDMA technology based on dual time slots (denoted as time slot 1 and time slot 2). The communication between wireless communication devices adopts a single-frequency half-duplex communication mode, that is, a wireless communication device can simultaneously use two time slots of a single frequency point to respectively achieve half-duplex communication with two other wireless communication devices. Further, a physical layer burst represents a physical layer time slot, and a frame synchronization identifier is set at the exact middle position of each burst (time slot). It is a bit sequence dedicated to time slot synchronization, which marks the middle position of a TDMA burst (time slot). Wireless communication devices use the frame synchronization identifier to achieve time synchronization, that is, the devices participating in wireless communication can transmit and receive according to the same timing reference, reducing conflicts and interference during the transceiver process. When the communication participant includes a BS, the frame synchronization identifier in the data burst received from the BS should be used to synchronize to the BS's channel (downlink channel), that is, the uplink channel timing is determined by the downlink channel timing; if two wireless mobile communication devices communicate directly, the wireless mobile communication device that transmits first on the channel establishes the timing reference for the two time slots, and the wireless mobile communication device that initiates the service later should first synchronize to the wireless mobile communication device already on the channel. On the premise that the timing reference has been determined, the wireless communication device ensures transmission and reception on the specified time slots.

[0030] As Figure 4As shown in FIG. 1 , a channel model of BS communicating with MS1 (vehicle-mounted mobile station 1) and MS2 (vehicle-mounted mobile station 2) at the same time is shown. BS communicates with MS1 and MS2 using single-frequency half-duplex communication, and simultaneously communicates with MS1 and MS2 through two TDMA service channels (recorded as time slot 1 and time slot 2). MS1 and BS perform data transmission and reception half-duplex communication in time slot 2, and MS2 and BS perform data transmission and reception half-duplex communication in time slot 1, as shown in FIG. Figure 4 A TDMA frame for interaction between the base station and the vehicle-mounted mobile station consists of two physical bursts. MS1 and MS2 communicate with the BS, which is responsible for service channel synchronization. MS1 and MS2 should use the frame synchronization identifier in the received BS downlink channel burst to synchronize to the downlink channel of the base station, that is, the uplink channel timing is determined by the downlink channel timing, ensuring that the BS, MS1 and MS2 can transmit and receive according to the same timing reference, reducing conflicts and interference during the transmission process.

[0031] The present invention proposes a wireless communication process method between train control devices, which adopts a "request-response" communication mode, where one party of the communication initiates a request and the other party responds. Generally, a mobile train control device initiates a communication request according to the functional requirements of the train control system, and a fixed train control device or a mobile train control device responds according to the content of the request information. The mobile device that initiates the communication first determines whether to resend or stop the request based on the received response message, thereby further ensuring the reliability of the communication transmission. The train control equipment and wireless communication equipment are designed based on IP networking architecture. The fixed train control equipment and the wireless communication equipment at its interface are pre-configured with static IP addresses. The mobile train control equipment and the wireless communication equipment at its interface request the fixed train control equipment to allocate a dynamic IP address during the communication establishment process. After the mobile train control equipment and the wireless communication equipment at its interface obtain the dynamic IP address, they are set as their own IP addresses. After the setting, the relationship between the IP addresses is: mobile device IP = fixed wireless communication device IP, mobile wireless communication device IP = fixed device IP. Due to the above IP address correspondence, when the mobile train control equipment and the fixed train control equipment send data to each other, from the perspective of physical connection, they are all sent to the wireless communication device connected to them. From the perspective of logical connection, they are all sent to the only TCP / IP connection established by both parties, without considering the specific format of the wireless communication connection, thereby realizing transparent transmission of messages between the two.

[0032] like Figure 5 and Figure 6As shown in the figure, the mobile train control equipment OBE initiates a communication request according to the functional requirements of the train control system, and the STC responds with corresponding information according to the content of the request information. The communication process mainly includes the OBE establishing a communication connection with the STC, the MS and the BS communicating to generate a session key, the OBE sending request information to the STC, and the STC responding with corresponding information to the OBE. The transport layer of the communication interface protocol between the two can select TCP (Transmission Control Protocol) technology or UDP (User Datagram Protocol) technology. In this embodiment, the TCP technology is taken as an example for illustration.

[0033] The process of the OBE establishing a communication connection with the STC Figure 3 This is a schematic diagram of the wireless communication process between the OBE and the STC proposed in this embodiment. The STC and the BS are pre-configured with static IP addresses, which are STC_IP and BS_IP respectively. Among them, STC_IP can be written into the ground trackside balise before entering the station, or into the station data of the on-vehicle track basic data, or input by the driver, etc. according to the design requirements of the train control system; the OBE and the MS use dynamic IP addresses, which are OBE_IP and MS_IP respectively, and are allocated by the ground equipment according to the application of the on-vehicle equipment. When the train approaches the station, the OBE obtains the IP address STC_IP of the target STC device through receiving balise message information, calling on-vehicle track basic data, or input by the driver, etc., and initiates a communication connection with the STC. First, the OBE sends a request message to establish a connection with the STC to the MS, and the message contains STC_IP. After receiving the OBE request message, the MS forwards it to the BS through the air interface wireless communication. After receiving the MS request message, the BS forwards it to the STC through a TCP connection. Then, after the STC verifies that the IP address in the request message is its own IP address, it replies to the BS with a response message through the TCP connection. The message contains STC_IP and BS_IP. After receiving the response message, the BS forwards it to the MS through the air interface wireless communication. After receiving the response message, the MS forwards it to the OBE. After receiving the response message, the OBE sets BS_IP as its own IP address, that is, OBE_IP = BS_IP; the MS sets STC_IP as its own address, that is, MS_IP = STC_IP. At this time, both the OBE and the MS obtain IP addresses through dynamic allocation, and a TCP connection is established between the two. Thus, a communication connection is established between the OBE and the STC.

[0034] Since MS_IP = STC_IP, for the OBE, sending a message to the STC device is equivalent to sending it to the MS device, realizing transparent transmission from the OBE to the STC, without writing STC_IP as the target address into the user data. Similarly, since BS_IP = OBE_IP, for the STC, sending a message to the OBE device is equivalent to sending it to the BS device, realizing transparent transmission from the STC to the OBE, without writing OBE_IP as the target address into the user data.

[0035] Further, if two sets of on-vehicle mobile devices need to establish communication with the same ground fixed device simultaneously, taking OBE1 (MS1) and OBE2 (MS2) communicating with STC as an example, two sets of communication need to be established simultaneously: OBE1-MS1-wireless communication connection b1—BS—STC, OBE2—MS2—wireless communication connection b2—BS—STC. Among them, MS1 communicates with BS, and MS2 communicates with BS. During communication, different logical channels using the same frequency point are respectively allocated for fixed use, that is, half-duplex communication is carried out using time slot 1 and time slot 2 respectively. That is, wireless communication connection b1 uses time slot 1 (taking time slot 1 as an example, it can also be time slot 2, the same below), and wireless communication connection b2 uses time slot 2. At the same time, for the request messages sent by MS1 and MS2, BS communicates with STC using different transmission ports to distinguish different communication channels. At this time, the communication channel allocation method is OBE1—MS1—wireless communication air interface time slot 1—BS (transmission port a1)—STC, OBE2—MS2—wireless communication air interface time slot 2—BS (transmission port a2)—STC, which is used for BS to determine whether the target device for response is MS1 or MS2.

[0036] Figure 6 This is a schematic diagram of the wireless communication information encryption process between OBE and STC proposed in this embodiment. After the communication connection between OBE and STC is established, OBE sends a request to MS to generate a wireless communication session key (Ks). After receiving the OBE request, MS forwards the request to BS. After receiving the request, BS sends the public key (Kp) to MS. After receiving Kp, MS randomly generates Ks using an encryption algorithm, encrypts it using the received Kp and sends it to BS. BS decrypts Ks using its private key and sends a Ks establishment completion message to OBE. OBE and STC can start transmitting train control data.

[0037] The OBE sends application layer data to STC. After the communication session key between MS and BS is generated, according to the functional requirements of the train control system, OBE sends a train control application data message to MS through a TCP connection with STC_IP as the target address. MS encrypts the corresponding data message at the extended link layer using Ks and sends the encrypted data message to BS; BS decrypts the encrypted data message to obtain the corresponding train control application data message and sends the application data packet to STC through a TCP connection.

[0038] The STC sends application layer data to the OBE. After receiving the train control application data message sent by the OBE according to the functional requirements of the train control system, the STC uses the OBE_IP as the destination address and replies to the corresponding application data message to the BS through the TCP connection. The BS encrypts the corresponding data message at the extended link layer using Ks and sends the encrypted data message to the MS. The MS decrypts the encrypted data message and sends the application data to the OBE through the TCP connection for the corresponding train control application data message.

[0039] As can be seen from the above embodiments, the wireless communication system for railway train control equipment proposed by the present invention can realize the mutual communication among the railway train control center equipment (CRS), train control station equipment (STC), train control trackside equipment (WSE), and train control on-vehicle equipment (OBE) through the establishment of a ground base station (BS), an on-vehicle mobile station (MS), and a trackside portable station (PS) using a 400 MHz wireless communication network, transmit train control-related information, shunting protection-related information, etc., and realize train control and train dispatching-related safety protection functions. The train control equipment and the wireless communication equipment adopt an IP-based networking architecture design, and by obtaining the IP address dynamically allocated by the fixed equipment through the wireless communication equipment of the mobile train control equipment and its interfaces, transparent transmission between train control equipment can be achieved. The air interface communication protocol between wireless communication equipment adopts a four-layer structure. By establishing an extended link layer (ELL) for realizing dynamic selection of data protocols and encryption of air interface communication data, the security and efficiency of data transmission are effectively improved; a session control layer (SCL) is established for realizing protocols such as dynamic mapping of network IP addresses and communication connection management, ensuring the reliability of data transmission and stable connection.

[0040] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention, and these modifications or changes all fall within the protection scope of the present invention.

Claims

1. A railway train control equipment wireless communication system, comprising a railway train control equipment and a wireless communication device connected thereto, wherein the railway train control equipment comprises a train control center equipment (CRS), a train control station equipment (STC), a train control trackside equipment (WSE) and a train control onboard equipment (OBE), wherein: CRS, STC, and WSE are fixed train control equipment, and OBE is a mobile train control equipment; the wireless communication equipment includes a ground base station (BS), a vehicle-mounted mobile station (MS), and a trackside portable station (PS), wherein the BS and CRS, the BS and STC, the PS and WSE, and the MS and OBE are wiredly connected using a standard Ethernet interface, and the BS, MS, and PS are wirelessly connected using a 400MHz digital wireless communication network, thereby realizing mutual communication between the railway train control equipment CRS, STC, WSE, and OBE; The interface communication of each railway train control equipment is implemented as follows: Interface ①, OBE—MS-wireless communication connection a-BS-STC; Interface ②, OBE-MS-wireless communication connection a-BS-CRS; Interface ③, OBE-MS-wireless communication connection b-PS-WSE; Interface ④, WSE—PS—wireless communication connection c—BS—STC; Interface ⑤, OBE—MS—wireless communication connection d—MS—OBE; The railway train control equipment wireless communication system realizes mutual communication between fixed train control equipment and mobile train control equipment, between mobile train control equipment, and between fixed train control equipment in the railway train control system, meeting the train control vehicle-ground information fusion control requirements.

2. The railway train control equipment wireless communication system according to claim 1, characterized in that: The wireless communication between the railway train control equipment includes: Interface ①, OBE communicates with STC, which can be used to transmit station interlocking information, operation disclosure and dispatching command information, train location information, train speed information, train related parameters, etc.; Interface ②, OBE communicates with CRS, which can be used to transmit station interlocking information, operation disclosure and dispatching command information, train location information, train speed information, train related parameters, etc.; Interface ③, OBE communicates with WSE and can be used to transmit signal status information of trackside equipment, etc. Interface ④, WSE communicates with STC and can be used to transmit signal status information of trackside equipment, etc.; Interface ⑤, OBE to OBE communication, can be used to transmit train location information, train running speed information, etc.

3. The railway train control equipment wireless communication system according to claim 2, characterized in that: Alternatively, OBE communicates with STC or CRS to exchange shunting protection related information, such as shunting operation notices, etc., to realize the information transmission function between the railway main locomotive and the special shunting locomotive and shunting protection vehicle; Train control devices can also transmit train control device status information to each other to realize real-time monitoring of train control device status; OBE-to-OBE communication can also be used to exchange train integrity information between the front and rear equipment of the same train.

4. The railway train control equipment wireless communication system according to claim 3, characterized in that: The mobile train control devices may communicate directly with each other using the wireless communication device, or forward using the wireless communication device connected to the fixed train control device; The train control wayside equipment (WSE) can also send information such as the trackside signal status to other train control equipment through the trackside portable station (PS) by wireless broadcasting.

5. The railway train control equipment wireless communication system according to claim 1, characterized in that: The interface communication protocol between the wireless communication device and the railway train control device adopts a 5-layer structure, including a first layer physical layer (PHY), a second layer data link layer (DLL), a third layer network layer (IP), a fourth layer transport layer (TCP / UDP) and a fifth layer session control layer (SCL, Session Control Layer); The wireless communication device and wireless communication device interface communication protocol adopts a 4-layer structure, including the first layer physical layer (PL), the second layer data link layer (DLL), the third layer extended link layer (ELL), and the fourth layer session control layer (SCL).

6. The railway train control equipment wireless communication system according to claim 1, characterized in that: The railway train control equipment wireless communication system adopts a 400MHz digital wireless communication channel model and a dual-time slot-based TDMA technology. The communication between the wireless communication devices adopts a single-frequency half-duplex communication mode, that is, one wireless communication device can simultaneously use two time slots of a single frequency to achieve half-duplex communication with two other wireless communication devices.

7. The railway train control equipment wireless communication system according to claim 1, characterized in that: The wireless communication interaction process between the railway train control devices adopts a "request-response" communication mode, where the mobile train control device initiates a communication request according to the functional requirements of the train control system, and the fixed train control device responds according to the request information content. The railway train control equipment and the wireless communication equipment adopt an IP networking architecture design, and the mobile train control device and the wireless communication equipment of its interface obtain the ground dynamically allocated IP address mechanism to realize transparent information transmission between the railway train control devices.

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