A railway DRTD system data transmission service quality testing method and system

Abstract

The present invention discloses a method and system for testing the quality of data transmission service of a railway DRTD system, which are corresponding solutions. In the solution, the validity and timeliness of data transmission of main network element nodes EMBC in the railway DRTD system can be tested, and at the same time, a method is provided for testing and verifying dispatching communication data services that are mainly carried by packet data of the railway DRTD system. The method and system can be widely used in railway DRTD system performance evaluation, daily debugging, system joint debugging and testing, and maintenance inspection, which are in line with the actual application requirements and scenarios of the railway DRTD system, do not affect the normal business processes of the railway DRTD system, are highly targeted, and can provide new methods and technical means for railway DRTD system operation and maintenance testing to ensure driving safety.

Description

Technical Field

[0001] The present invention relates to the field of railway communication technology, and in particular to a method and system for testing the quality of data transmission service of a railway DRTD system. Background Art

[0002] With the continuous advancement of railway informatization, the role of wireless train dispatching communications in ensuring railway safety and efficiency is becoming increasingly important. The GSM-R digital mobile communication system (Global System for Mobile Communications, Railways) and the currently under-research 5G-R dedicated mobile communication system (a railway-specific mobile communication system based on 5G technology) can meet the voice and data transmission needs of high-speed and trunk railway operations, such as train control, operation, and maintenance. For branch lines and local dedicated lines, the 450MHz analog wireless train dispatching system suffers from low frequency resource utilization and poor interference immunity, and is no longer adequate for train operations. With technological advancements, professional wireless communications will inevitably transition from analog to digital technologies. Furthermore, radio frequencies have been replanned and adjusted, with the original 450MHz band dedicated to railways being reclaimed. To address this need, a 400MHz digital wireless train dispatching communication system (railway DRTD system) has been established, and research has been initiated on the planning and application of services and key technologies for the 400MHz band. The railway DRTD system carries the main railway dispatching communication voice calls and dispatching command information transmission services. These two railway dispatching communication services mainly use EMBC (Enhanced Multi-Frame Control Message) and packet data respectively. At present, the train digital wireless dispatching communication system has completed on-site trial assessment and is about to be promoted for use in equipment throughout the railway. However, the corresponding testing technology for the railway DRTD system is still incomplete.

[0003] Chinese invention patent application CN103167529B, "GSM-R Detection System and Method," proposes a railway GSM-R detection system and method. However, this method is applicable only to railway GSM-R systems; it is not applicable to the newly developed railway DRTD system, and the patent provides limited details on the testing method. Chinese invention patent application CN115412881A, "A High-Speed Railway 5G-R Signal Detection Method and System Based on a Handheld Terminal," provides a 5G-R signal detection solution, but it is also not applicable to railway DRTD systems. Summary of the Invention

[0004] The purpose of the present invention is to provide a railway DRTD system data transmission service quality testing method and system, which can be widely used in railway DRTD system performance evaluation, and used for railway DRTD system daily debugging, system joint debugging and testing, and maintenance inspection. It fits the actual application needs and scenarios of the railway DRTD system, does not affect the normal business processes of the railway DRTD system, is highly targeted, and can support the operation and maintenance of the railway DRTD system.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A railway DRTD system data transmission service quality test system, comprising:

[0007] On-board test equipment and ground test equipment, the on-board test equipment is communicatively connected to a fixed station of a railway DRTD system, and the ground test equipment is communicatively connected to a digital train dispatch interface server of the railway DRTD system; the on-board test equipment and the ground test equipment cooperate to simulate the EMBC and packet data communication process of the railway DRTD system, perform EMBC and packet data transmission and reception between the on-board test equipment and the ground test equipment, and complete EMBC and packet data transmission service quality testing; the railway DRTD system is a 400MHz frequency band digital wireless train dispatch communication system; the EMBC is an enhanced multi-frame control message;

[0008] EMBC and packet data transmission service quality tests include:

[0009] EMBC data transmission service quality test: The on-board test equipment cyclically transmits EMBC test data at set time intervals. The fixed radio station determines the receiving end based on the characteristic data in the EMBC test data and transmits the data to the receiving end. After receiving the EMBC test data, the receiving end transparently returns the EMBC test data to the on-board test equipment via the original route. The on-board test equipment calculates the EMBC data transmission service quality by counting the time of the received EMBC test data and the characteristic data content contained in the data.

[0010] Packet data transmission service quality test: The on-board test equipment sends control commands related to packet data transmission test to the ground test equipment through the railway DRTD system to start the transmission service quality test. The ground test equipment calculates the packet data transmission service quality based on the total number of packet test data sent by the sending end and the total number of packet test data successfully received by the receiving end; wherein, in the packet data transmission service quality test process, when the sending end is the on-board test equipment, the receiving end is the ground test equipment; when the sending end is the ground test equipment, the receiving end is the on-board test equipment.

[0011] A railway DRTD system data transmission service quality testing method is implemented based on the aforementioned system, and the method includes:

[0012] By cooperating with the on-board test equipment and the ground test equipment, the EMBC and packet data communication process of the railway DRTD system is simulated, EMBC and packet data are sent and received between the on-board test equipment and the ground test equipment, and the EMBC and packet data transmission service quality test is completed;

[0013] EMBC and packet data transmission service quality tests include:

[0014] EMBC data transmission service quality test: The on-board test equipment cyclically transmits EMBC test data at set time intervals. The fixed radio station determines the receiving end based on the characteristic data in the EMBC test data and transmits the data to the receiving end. After receiving the EMBC test data, the receiving end transparently returns the EMBC test data to the on-board test equipment via the original route. The on-board test equipment calculates the EMBC data transmission service quality by counting the time of the received EMBC test data and the characteristic data content contained in the data.

[0015] Packet data transmission service quality test: The on-board test equipment sends control commands related to packet data transmission test to the ground test equipment through the railway DRTD system to start the transmission service quality test. The ground test equipment calculates the packet data transmission service quality based on the total number of packet test data sent by the sending end and the total number of packet test data successfully received by the receiving end; wherein, in the packet data transmission service quality test process, when the sending end is the on-board test equipment, the receiving end is the ground test equipment; when the sending end is the ground test equipment, the receiving end is the on-board test equipment.

[0016] It can be seen from the technical solution provided by the present invention that the service quality of EMBC data transmission of the main equipment network elements in the railway DRTD system can be tested, and at the same time, a method is provided for testing and verifying the data services that are mainly carried by the packet data of the railway DRTD system. It can be widely used in railway DRTD system performance evaluation, daily debugging, system joint debugging and maintenance inspection, which is in line with the actual application needs and scenarios of the railway DRTD system, does not affect the normal business processes of the railway DRTD system, is highly targeted, and can provide new methods and technical means for the operation and maintenance testing of the railway DRTD system to ensure driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of a railway DRTD system data transmission service quality test system provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of a data transmission process in which the receiving end is a fixed station control device provided in an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of a data transmission process in which the receiving end is an interface server provided in an embodiment of the present invention;

[0021] Figure 4 A schematic diagram of a data transmission process in which the receiving end is a ground test device provided in an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of a simulated railway dispatching command test process provided by an embodiment of the present invention;

[0023] Figure 6 A schematic diagram of a simulated train number verification information test process provided by an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of a ground test equipment control flow initiated by a vehicle-mounted test equipment according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] First, the following terms may be used in this article:

[0027] The terms "include," "comprises," "contains," "has," or other similar expressions should be interpreted as non-exclusive. For example, "including certain technical features (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products, or manufactured articles)" should be interpreted as including not only the technical features explicitly listed, but also other technical features known in the art that are not explicitly listed.

[0028] The term "consisting of" excludes any technical features not explicitly listed. If used in a claim, this term renders the claim closed, excluding any technical features other than those explicitly listed, except for conventional impurities associated with them. If this term appears only in a clause of a claim, it limits only the elements explicitly listed in that clause; elements listed in other clauses are not excluded from the claim as a whole.

[0029] Unless otherwise specified or limited, the terms "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this document based on specific circumstances.

[0030] The following describes in detail a railway DRTD system data transmission quality of service testing method and system provided by the present invention. Any information not described in detail in the embodiments of the present invention represents prior art known to those skilled in the art. Where specific conditions are not specified in the embodiments of the present invention, the test is conducted in accordance with conventional conditions in the art or the conditions recommended by the manufacturer. Instruments used in the embodiments of the present invention, where the manufacturer is not specified, are all commercially available conventional products.

[0031] Example 1

[0032] like Figure 1 Figure 2 is a schematic diagram of a railway DRTD system data transmission service quality test system, which mainly includes:

[0033] The on-board test equipment and the ground test equipment are connected to the fixed radio station of the railway DRTD system by wireless communication, and the ground test equipment is connected to the digital train modulation interface server of the railway DRTD system by wired communication; the on-board test equipment and the ground test equipment cooperate to simulate the EMBC and packet data communication process of the railway DRTD system, send and receive EMBC and packet data between the on-board test equipment and the ground test equipment, and complete the EMBC and packet data transmission service quality test.

[0034] The onboard test equipment cooperates with the ground test equipment to simulate the EMBC and packet data communication process with the railway DRTD system. EMBC and packet data are sent and received between the onboard test equipment and the ground test equipment through the railway DRTD system to complete the EMBC and packet data transmission service quality test. The test mainly includes the following test contents:

[0035] (1) EMBC data transmission service quality test: The on-board test equipment sends EMBC test data cyclically at set time intervals. The fixed radio station determines the receiving end based on the characteristic data in the EMBC test data and sends it to the receiving end. After receiving the EMBC test data, the receiving end returns the EMBC test data to the on-board test equipment through transparent backhaul. The on-board test equipment counts the time of the received EMBC test data and the characteristic data content contained therein, and calculates the EMBC data transmission service quality.

[0036] In an embodiment of the present invention, the receiving end can be a device network element in the railway DRTD system or a ground test device. If the receiving end is a fixed radio station, the fixed radio station directly replies with a response message to the on-board test device and sends the EMBC test data to the on-board test device via transparent backhaul. If the receiving end is not a fixed radio station (for example, other device network elements in the railway DRTD system other than the fixed radio station, or ground test equipment), the fixed radio station sends the EMBC test data to the receiving end according to the transmission channel and replies with a response message to the on-board test device. After receiving the EMBC test data, the device network elements in the transmission channel reply with a confirmation message to the previous device network element and transparently transmit the data to the next device network element in the transmission channel. When the data reaches the receiving end, the receiving end transmits the EMBC test data along the original transmission channel to the on-board test device via transparent backhaul. The transmission channel refers to the communication channel from the fixed radio station to the digital train modulation interface server in the railway DRTD system, and the device network element refers to each device in the transmission channel.

[0037] In an embodiment of the present invention, the on-board test equipment counts the time of receiving EMBC test data and the characteristic data content contained therein, and calculates the EMBC data transmission service quality, including: the on-board test equipment counts the time of receiving the response message, and calculates the transmission delay of the EMBC test data in combination with the sending time of the corresponding EMBC test data; the on-board test equipment records the number of EMBC test data packet losses based on the characteristic data in the received EMBC test data, and calculates the packet loss rate in combination with the total number of EMBC test data sent; the transmission delay and packet loss rate are both indicators of the EMBC data transmission service quality.

[0038] Those skilled in the art will understand that transparent backhaul refers to the direct return of received data. In the present invention, the receiving end directly returns the received EMBC test data to the sending end. The sending end can count whether there has been packet loss and determine the number of packet losses based on the packet number and parity bit in the characteristic data of the received EMBC test data.

[0039] (2) Packet data transmission service quality test: The on-board test equipment sends control commands related to packet data transmission test to the ground test equipment through the railway DRTD system to start the transmission service quality test. The ground test equipment calculates the packet data transmission service quality based on the total number of packet test data sent by the sending end and the total number of packet test data successfully received by the receiving end. In the packet data transmission service quality test process, when the sending end is the on-board test equipment, the receiving end is the ground test equipment; when the sending end is the ground test equipment, the receiving end is the on-board test equipment.

[0040] In the embodiment of the present invention, the packet test data in the packet data transmission service quality test process may be a simulated railway dispatching command or simulated train number verification information.

[0041] (2.1) When the packet test data is a simulated railway dispatching command, the ground test equipment is the sending end and the on-board test equipment is the receiving end; the ground test equipment calculates the railway dispatching command transmission success rate based on the total number of simulated railway dispatching commands sent and the total number of simulated railway dispatching commands successfully received by the on-board test equipment.

[0042] (2.2) When the grouped test data is simulated train number verification information, the ground test equipment is the receiving end and the on-board test equipment is the sending end; the ground test equipment calculates the success rate of the train number verification information transmission based on the total number of simulated train number verification information sent by the on-board test equipment and the total number of simulated train number verification information successfully received by the ground test equipment.

[0043] The dispatch command transmission success rate and train number verification information transmission success rate obtained in the above test process are both indicators of the quality of packet data transmission service.

[0044] Preferably, the process of the on-board test equipment sending a control command related to the packet data transmission test to the ground test equipment through the railway DRTD system includes:

[0045] The on-board test equipment sends test-related control commands to the ground test equipment through the railway DRTD system. The test-related control commands are transmitted to the ground test equipment via the transmission channel in the railway DRTD system. After receiving the test-related control commands, the device network elements in the transmission channel reply with a confirmation message to the previous device network element and transparently transmit it to the next device network element in the transmission channel. After receiving the test-related control commands, the ground test equipment replies with a control command response (indicating that the control command response has been received) and transmits it to the on-board test equipment along the original transmission channel. The transmission channel refers to the communication channel from the fixed radio station to the digital train modulation interface server in the railway DRTD system, and the device network element refers to each device in the transmission channel.

[0046] Preferably, the method further includes: performing activity detection between the vehicle-mounted test equipment and the fixed radio station through communication response; and performing two-way activity detection between the ground test equipment and the digital train modulation interface server.

[0047] The embodiment of the present invention proposes a test method for testing the data transmission service quality of the railway DRTD system. This method can test the effectiveness and timeliness of data transmission of the main equipment network element EMBC in the railway DRTD system, and at the same time provides a method for testing and verifying the dispatching communication data service that is mainly carried by the packet data of the railway DRTD system. It can be widely used in railway DRTD system performance evaluation, daily debugging, system joint debugging and maintenance inspection, conforms to the actual application requirements and scenarios of the railway DRTD system, does not affect the normal business processes of the railway DRTD system, is highly targeted, and can provide new methods and technical means for the operation and maintenance testing of the railway DRTD system.

[0048] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the method provided by the embodiment of the present invention is described in detail below with reference to specific embodiments.

[0049] 1. System architecture

[0050] See also the aforementioned Figure 1The entire system mainly includes: on-board test equipment and ground test equipment. The on-board test system is installed on the test vehicle as an on-board test equipment, simulating the railway DRTD system on-board equipment to complete the railway DRTD system data (including EMBC and packet data), test data collection and statistics. The on-board test equipment is connected to the fixed radio station of the railway DRTD system through the air interface (air interface). The ground test equipment is installed in the central computer room of the railway DRTD system, interconnected with the railway DRTD system digital train modulation interface server, and cooperates with the on-board test equipment to complete the data service quality test.

[0051] In an embodiment of the present invention, the on-board test equipment mainly includes a first controller and a DRTD test module. The first controller is responsible for controlling the DRTD test module to complete test-related processes. The ground test equipment mainly includes a second controller and a switch. The second controller receives control commands from the on-board test equipment, sends and receives data through the switch, and cooperates with the on-board test equipment to complete the data transmission service quality test.

[0052] In the embodiment of the present invention, the data service quality test mainly involves the EMBC and packet data transmission service quality test. In order to be as close as possible to the actual application of the railway DRTD system, the test data needs to run through all data transmission network elements and bearer network transmission channels of the railway DRTD system, including the fixed radio stations, fixed radio station controllers, digital train modulation interface servers and other equipment network elements of the railway DRTD system. The following is a detailed introduction to the data transmission service quality test based on the collaboration between on-board test equipment and ground test equipment.

[0053] 2. EMBC and packet data transmission service quality test scheme.

[0054] 1. EMBC data transmission service quality testing solution.

[0055] Because the services carried by the railway DRTD system's EMBC all use EMBC single packets, for application scenarios with a large amount of service data, the railway DRTD system application equipment divides the service data into EMBC multiple packets and sends them. The receiving end reassembles the data based on the characteristic packet number. In view of this, the EMBC data transmission service quality test uses the EMBC single packet method.

[0056] (1) Overall testing process.

[0057] (1.1) The onboard test equipment transmits data over the railway DRTD system air interface. During the test, single packets of EMBC test data are cyclically transmitted at regular intervals. EMBC test data includes characteristic data such as the packet number, packet length, receiving device number, and parity bit. The data transmission interval must be defined according to the railway DRTD system specifications to avoid abnormal packet loss caused by the transmission interval.

[0058] (1.2) After the EMBC test data reaches the railway DRTD system equipment network element (for example, initially arriving at a fixed radio station) via the transmission channel, the equipment network element determines whether the data should be transparently transmitted or transparently returned based on the characteristic data in the test data packet. If the receiving end transparently returns the data, it is quickly looped back and forwarded to the sending end. The sending end here refers to the on-board test equipment, and the receiving end refers to a specific equipment network element or ground test equipment.

[0059] (1.3) The on-board test equipment counts the time interval from the start of transmitting the first bit of EMBC test data to the completion of receiving the last bit of the same EMBC test data transparently returned as the corresponding EMBC test data transmission time.

[0060] (1.4) The on-board test equipment records the number of EMBC test data packet losses based on the characteristic data in the received EMBC test data, and calculates the packet loss rate based on the total number of EMBC test data packets sent by itself.

[0061] In the embodiment of the present invention, the EMBC test data carries continuous packet numbers and check bits. If the transparently returned EMBC test data fails to be checked or has discontinuous packet numbers, it is considered a packet loss situation.

[0062] (2) Data transmission process when the receiving end is a different device.

[0063] The EMBC test data transmission test completes the transmission delay and packet loss rate test through data loopback between the on-board test equipment and the network elements of the railway DRTD system and the ground test equipment. When a fixed station receives EMBC test data, it needs to reply with a frame of response message regardless of whether it is the receiving end. When the receiving end is a fixed station control device, digital train interface server or ground test equipment, the data is transparently transmitted to the corresponding receiving end, and the corresponding receiving end then replies with a frame of response. When the receiving end is not a fixed station, the data transmission process of the EMBC data transmission test when the receiving end is different equipment is as follows Figures 2 to 4 As shown, the corresponding receiving ends are fixed radio control equipment, digital modulation interface server, and ground test equipment; the "air interface" in front of each information or command in the figure indicates transmission through the air interface, and the symbols in brackets indicate the execution order of the process shown in the corresponding figure.

[0064] Figure 2In this example, the receiving end is the fixed station control device. The fixed station receives the EMBC test data (denoted as A1H) transmitted over the air interface and responds with a confirmation message. The sender of the confirmation message is the fixed station and transparently transmits the EMBC test data to the fixed station control device. The fixed station control device responds with a confirmation message to the fixed station and, using transparent backhaul, responds with EMBC test data (denoted as A2H). The content of the data is the same as the EMBC test data (A1H). After receiving the EMBC test data (A2H), the fixed station responds with a confirmation message to the fixed station control device and forwards the EMBC test data (A2H) over the air interface to the on-board test equipment, indicating that the sender is the fixed station control device.

[0065] Figure 3 In the example, the receiving end is the digital column modulation interface server. Figure 2 On the basis of the digital train interface server and the fixed station control equipment, the interaction process is added. Figure 2 The interaction process between the fixed radio control device and the fixed radio is similar, that is, after the digital train modulation interface server receives the EMBC test data (denoted as A1H) as the receiving end, it replies a confirmation message to the fixed radio control device and replies with the EMBC test data (the content is the same as A1H) in a transparent return manner. After receiving the message, the fixed radio control device replies a confirmation message to the digital train modulation interface server.

[0066] Figure 4 In the test, the receiving end is the ground test equipment. Figure 3 On this basis, the interaction process between the digital train interface server and the ground test equipment is added. The principle is similar, so I will not go into details.

[0067] 2. Packet data transmission service quality test plan.

[0068] Since the railway dispatching command messages carried by the railway DRTD system packet data mainly include railway dispatching commands and train number verification information, in order to fit the actual application of the railway DRTD system and truly reflect the status of the railway DRTD system, the packet data transmission service quality adopts a simulated railway dispatching command message transmission method, including simulated railway dispatching commands and train number verification information transmission. In order not to affect the normal dispatching communication operation of the railway DRTD system and simulate the actual application method at the same time to achieve isolation from the train control system, the simulated railway dispatching command and train number verification information both include the test-specific locomotive number and train number. The digital train dispatching interface server of the railway DRTD system determines whether it is test data based on the test-specific locomotive number and train number.

[0069] The test-specific locomotive number is collectively referred to as 8 digits, one part of which is a fixed value, and the other part is the railway bureau and vehicle model identification; illustratively: the first 4 digits are fixed values (for example, fixed to 9), the 5th to 6th digits are the railway bureau identification, the 7th digit is the vehicle model identification, and the 8th digit is the number; of course, the specific setting method can be set by the user according to actual conditions, and the present invention does not limit it.

[0070] The test-specific train number can also be set according to actual conditions or experience, as long as it can be distinguished from the normal train number. Table 1 shows an example of the test-specific train number.

[0071] Table 1: Test vehicle number

[0072] Field Alphabetic part Digital part meaning DJ or JJ Starting numbering from 9901

[0073] (2.1) Simulate the railway dispatching command test process.

[0074] like Figure 5 As shown in the figure, the test process mainly includes:

[0075] (A1) The on-board test equipment sends test-related control commands to the ground test equipment through the railway DRTD system to start the transmission service quality test (specifically, to start the simulated railway dispatching command test). The ground test equipment sends a response through the railway DRTD system and enters the dispatching command test state; the ground test equipment uses the railway DRTD system to send simulated railway dispatching commands in the form of packet data and records the number of simulated railway dispatching command information sent.

[0076] Exemplarily, the sending interval is not less than 60 seconds, the total number of transmissions is not less than 200, and the simulated dispatching command information format complies with the relevant provisions of relevant railway standards.

[0077] (A2) The on-board test equipment receives and displays the railway dispatching command information through the railway DRTD system, and returns the dispatching command to the ground test equipment through the railway DRTD system for automatic receipt and manual confirmation.

[0078] (A3) The ground test equipment confirms whether the simulated railway dispatching command is successful based on the automatic receipt and manual confirmation information returned by the on-board test equipment, and counts the total number of successfully received simulated railway dispatching commands. Combined with the total number of sent simulated railway dispatching commands, the railway dispatching command transmission success rate is calculated:

[0079] The success rate of railway dispatching command transmission = (the total number of successfully received simulated railway dispatching commands / the total number of sent simulated railway dispatching commands) × 100%.

[0080] (A4) The ground test equipment returns the railway dispatching command transmission success rate (test results) to the on-board test equipment in real time through the railway DRTD system.

[0081] (A5) When the test is completed, the on-board test equipment sends a test end command to the ground test equipment through the railway DRTD system, and the ground test equipment sends a test stop response through the railway DRTD system.

[0082] (2.2) Simulate the train number verification information test process.

[0083] like Figure 6 As shown in the figure, the test process mainly includes:

[0084] (B1) The on-board test equipment sends test-related control commands to the ground test equipment through the railway DRTD system to start the transmission service quality test (specifically, starting the simulated train number verification information. The ground test equipment responds through the railway DRTD system and enters the train number verification information test state. The on-board test equipment uses the railway DRTD system to send simulated train number verification information in the form of packet data and records the number of train number verification information sent.

[0085] Exemplarily, the sending interval is random, the total number of transmissions is not less than 200, and the format of the simulated train number verification information complies with the relevant provisions of the relevant railway standards.

[0086] (B2) The ground test equipment receives the train number verification information through the railway DRTD system, counts the total number of successfully received simulated train number verification information, and determines the total number of sent simulated train number verification information based on the sequence number of the train number verification information, and calculates the train number verification information transmission success rate:

[0087] The success rate of train number verification information transmission = (the total number of successfully received simulated train number verification messages / the total number of sent simulated train number verification messages) × 100%.

[0088] (B3) The ground test equipment returns the train number verification information transmission success rate (test results) in real time through the railway DRTD system on-board test equipment.

[0089] (B4) When the test is completed, the on-board test equipment sends a test end command to the ground test equipment through the railway DRTD system EMBC data, and the ground test equipment sends a test stop response through the railway DRTD system.

[0090] (2.3) Control command transmission process between vehicle-mounted test equipment and ground test equipment.

[0091] This section primarily describes the test-related control command transmission process between the onboard test equipment and the ground test equipment involved in (A1) and (B1) above. The onboard test equipment issues test-related control commands to the ground test equipment via the railway DRTD system. The ground test equipment then responds with control command responses and transmits test data (i.e., the simulated railway dispatching commands and simulated train number verification information) to the onboard test equipment. These two test-related control commands are collectively referred to as ground test equipment control commands.

[0092] When the control command is not "fixed station reply response", the process of transparent transmission of the control command between ground test equipment is as follows: Figure 7 As shown, first, the on-board test equipment sends a ground test equipment control command (denoted as A3H) to the fixed radio station through the air interface. After that, it is transparently transmitted to the ground test equipment through the fixed radio station, the fixed radio station control equipment, and the digital train interface server in sequence. During this process, each device network element and the ground test equipment will reply with a confirmation message to the upper level after receiving the ground test equipment control command (A3H); the ground test equipment will reply with a ground test equipment control command response (denoted as A4H) and return to the on-board test equipment along the same route. During this process, each device network element will reply with a confirmation message to the upper level; when the on-board test equipment receives the ground test equipment control command response, it enters the corresponding test state.

[0093] In the above process, when the railway DRTD system sends information or commands to the on-board test equipment or ground test equipment, it is sent in the form of EMBC data.

[0094] 3. Activity detection.

[0095] In order to prevent the on-board test equipment from abnormally dropping the line and disconnecting from the railway DRTD system, as well as the ground test equipment from abnormally or disconnecting from the railway DRTD system from affecting the test results, it is necessary to perform activity detection between the test equipment (on-board test equipment and ground test equipment) and the railway DRTD system.

[0096] According to the railway DRTD system specifications, during the test process, the on-board test equipment can perform activity detection by responding to the train number query information sent by the fixed radio station 175s, so as to avoid the railway DRTD system deregistering the on-board test equipment during the system test and prevent disconnection.

[0097] Bidirectional activity checks are performed between the ground test equipment and the railway DRTD system's digital train dispatch interface server. This activity check uses UDP (User Datagram Protocol) with confirmation and no retransmissions. For example, the activity check duration is 5 seconds. If no activity check confirmation is received three times in a row, the activity check is considered to have failed. At this point, other services are stopped and the activity check is attempted again.

[0098] Example 2

[0099] The embodiment of the present invention further provides a method for testing the quality of service of data transmission in a railway DRTD system, which is mainly implemented based on the system provided in the above embodiment. The method mainly includes:

[0100] By coordinating onboard test equipment with ground test equipment, the EMBC and packet data communication processes of the railway DRTD system are simulated. EMBC and packet data are sent and received between the onboard test equipment and the ground test equipment, and the EMBC and packet data transmission service quality test is completed.

[0101] EMBC and packet data transmission service quality tests include:

[0102] EMBC data transmission service quality test: The on-board test equipment cyclically transmits EMBC test data at set time intervals. The fixed radio station determines the receiving end based on the characteristic data in the EMBC test data and transmits the data to the receiving end. After receiving the EMBC test data, the receiving end transparently returns the EMBC test data to the on-board test equipment via the original route. The on-board test equipment calculates the EMBC data transmission service quality by counting the time of the received EMBC test data and the characteristic data content contained in the data.

[0103] Packet data transmission service quality test: The on-board test equipment sends control commands related to packet data transmission test to the ground test equipment through the railway DRTD system to start the transmission service quality test. The ground test equipment calculates the packet data transmission service quality based on the total number of packet test data sent by the sending end and the total number of packet test data successfully received by the receiving end; wherein, in the packet data transmission service quality test process, when the sending end is the on-board test equipment, the receiving end is the ground test equipment; when the sending end is the ground test equipment, the receiving end is the on-board test equipment.

[0104] Through the above description of the embodiments, those skilled in the art will clearly understand that the above embodiments can be implemented via software or by utilizing software plus a necessary general-purpose hardware platform. Based on this understanding, the technical solutions of the above embodiments can be embodied in the form of a software product. This software product can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, or mobile hard drive) and includes a number of instructions for enabling a computer device (such as a personal computer, server, or network device) to execute the methods described in various embodiments of the present invention.

[0105] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes prior art already known to those skilled in the art.

Claims

1. A railway DRTD system data transmission service quality test system, characterized in that: include: On-board test equipment and ground test equipment, the on-board test equipment is communicatively connected to a fixed station of the railway DRTD system, and the ground test equipment is communicatively connected to a digital train dispatch interface server of the railway DRTD system; the on-board test equipment and the ground test equipment cooperate to simulate the EMBC and packet data communication process of the railway DRTD system, perform EMBC and packet data transmission and reception between the on-board test equipment and the ground test equipment, and complete EMBC and packet data transmission service quality testing; the railway DRTD system is a 400MHz frequency band digital wireless train dispatch communication system; The EMBC is an enhanced multi-frame control message; EMBC and packet data transmission service quality tests include: EMBC data transmission service quality test: EMBC test data is cyclically sent by the on-board test equipment at set time intervals, the fixed radio station determines the receiving end based on the characteristic data in the EMBC test data and sends it to the receiving end, and after receiving the EMBC test data, the receiving end returns the EMBC test data to the on-board test equipment via transparent backhaul. The on-board test equipment counts the time of receiving the EMBC test data and the characteristic data content contained therein, and calculates the EMBC data transmission service quality, including: the on-board test equipment counts the time of receiving the response message, and calculates the transmission delay of the EMBC test data in combination with the sending time of the corresponding EMBC test data; the on-board test equipment records the number of EMBC test data packet losses based on the characteristic data in the received EMBC test data, and calculates the packet loss rate in combination with the total number of EMBC test data sent; the transmission delay and packet loss rate are both indicators of EMBC data transmission service quality; wherein, the characteristic data in the EMBC test data include: packet number, packet length, receiving end device number and check bit; Packet data transmission service quality test: The on-board test equipment sends control commands related to packet data transmission test to the ground test equipment through the railway DRTD system to start the transmission service quality test. The ground test equipment calculates the packet data transmission service quality based on the total number of packet test data sent by the sending end and the total number of packet test data successfully received by the receiving end; wherein, in the packet data transmission service quality test process, when the sending end is the on-board test equipment, the receiving end is the ground test equipment; when the sending end is the ground test equipment, the receiving end is the on-board test equipment.

2. A railway DRTD system data transmission service quality test system according to claim 1, characterized in that: The fixed station determines the receiving end according to the characteristic data in the EMBC test data and sends it to the receiving end. After receiving the EMBC test data, the receiving end returns the EMBC test data to the vehicle-mounted test equipment through a transparent backhaul, including: If the receiving end is a fixed station, the fixed station directly replies with a response message to the vehicle-mounted test equipment and sends the EMBC test data to the vehicle-mounted test equipment via transparent backhaul; If the receiving end is not a fixed radio station, the fixed radio station sends the EMBC test data to the receiving end according to the transmission channel, and replies with a response message to the on-board test equipment. After receiving the EMBC test data, the device network elements in the transmission channel reply with a confirmation message to the upper device network element, and transparently transmit it to the next device network element in the transmission channel. When it reaches the receiving end, the receiving end transmits the EMBC test data along the original transmission channel to the on-board test equipment in a transparent backhaul manner; wherein, the transmission channel refers to the communication channel from the fixed radio station to the digital train modulation interface server in the railway DRTD system, and the device network element refers to each device in the transmission channel.

3. A railway DRTD system data transmission service quality test system according to claim 1, characterized in that: The ground test equipment calculates the packet data transmission service quality according to the total amount of packet test data sent by the sending end and the total amount of packet test data successfully received by the receiving end, including: When the packet test data is a simulated railway dispatching command, the ground test device is a sending end and the vehicle-mounted test device is a receiving end; The ground test equipment calculates the railway dispatching command transmission success rate according to the total number of simulated railway dispatching commands sent and the total number of simulated railway dispatching commands successfully received by the on-board test equipment; The railway dispatch command transmission success rate is an indicator of the packet data transmission service quality.

4. A railway DRTD system data transmission service quality test system according to claim 1, characterized in that: The ground test equipment calculates the packet data transmission service quality according to the total amount of packet test data sent by the sending end and the total amount of packet test data successfully received by the receiving end, including: When the grouped test data is simulated train number verification information, the ground test equipment is the receiving end and the vehicle-mounted test equipment is the sending end; The ground test equipment calculates the train number verification information transmission success rate based on the total number of simulated train number verification information sent by the on-board test equipment and the total number of simulated train number verification information successfully received by the ground test equipment; The train number verification information transmission success rate is an indicator of the packet data transmission service quality.

5. A railway DRTD system data transmission service quality test system according to claim 1, characterized in that: The process of the on-board test equipment sending a control command related to the packet data transmission test to the ground test equipment through the railway DRTD system includes: The on-board test equipment sends test-related control commands to the ground test equipment through the railway DRTD system. The test-related control commands are transmitted to the ground test equipment via the transmission channel in the railway DRTD system. After receiving the test-related control commands, the device network elements in the transmission channel reply with a confirmation message to the previous device network element and transparently transmit it to the next device network element in the transmission channel. After receiving the test-related control commands, the ground test equipment replies with a control command response and transmits it to the on-board test equipment along the original transmission channel. The transmission channel refers to the communication channel from the fixed radio station to the digital train modulation interface server in the railway DRTD system, and the device network element refers to each device in the transmission channel.

6. A railway DRTD system data transmission service quality test system according to claim 1, characterized in that: Also includes: The vehicle-mounted test equipment and the fixed radio station communicate and respond to each other to perform activity detection; Also, two-way activity detection is performed between the ground test equipment and the digital train interface server.

7. A railway DRTD system data transmission service quality testing method, characterized in that: Based on the system implementation according to any one of claims 1 to 6, the method includes: By cooperating with the on-board test equipment and the ground test equipment, the EMBC and packet data communication process of the railway DRTD system is simulated, EMBC and packet data are sent and received between the on-board test equipment and the ground test equipment, and the EMBC and packet data transmission service quality test is completed; EMBC and packet data transmission service quality tests include: EMBC data transmission service quality test: The on-board test equipment cyclically transmits EMBC test data at set time intervals. The fixed radio station determines the receiving end based on the characteristic data in the EMBC test data and transmits the data to the receiving end. After receiving the EMBC test data, the receiving end transparently returns the EMBC test data to the on-board test equipment via the original route. The on-board test equipment calculates the EMBC data transmission service quality by counting the time of the received EMBC test data and the characteristic data content contained in the data. Packet data transmission service quality test: The on-board test equipment sends control commands related to packet data transmission test to the ground test equipment through the railway DRTD system to start the transmission service quality test. The ground test equipment calculates the packet data transmission service quality based on the total number of packet test data sent by the sending end and the total number of packet test data successfully received by the receiving end; wherein, in the packet data transmission service quality test process, when the sending end is the on-board test equipment, the receiving end is the ground test equipment; when the sending end is the ground test equipment, the receiving end is the on-board test equipment.

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