Method and system for testing data transmission service quality of railway DRTD system

Abstract

The invention discloses a method and a system for testing the data transmission service quality of a railway DRTD system, which are corresponding schemes, and in the scheme, the effectiveness and the timeliness of EMBC data transmission of main network element nodes in the railway DRTD system can be tested; meanwhile, the method is provided for dispatching communication data service testing and verification of grouped data key bearing of the railway DRTD system, can be widely applied to railway DRTD system performance evaluation, daily debugging, system joint debugging and testing and maintenance inspection, meets the actual application requirements and scenes of the railway DRTD system, does not affect the normal service process of the railway DRTD system, is high in pertinence, and is suitable for popularization and application. A new method and technical means can be provided for operation and maintenance testing of the railway DRTD system, and driving safety is guaranteed.

Description

Technical Field

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

[0002] With the continuous improvement of the informatization level of railways, the role of train wireless dispatching communication in railway safety and efficiency has become increasingly important. The GSM-R digital mobile communication system (railway-specific global digital mobile communication system) and the 5G-R dedicated mobile communication system under research (railway-specific mobile communication system based on 5G technology) can meet the bearer requirements for voice and data transmission in services such as high-speed railway and main-line railway train operation command and operation and maintenance. For branch lines and local dedicated lines, the 450 MHz analog wireless train dispatching system has problems such as low frequency resource utilization rate and poor anti-interference ability, and can no longer meet the train operation requirements well. With the development of technology, professional wireless communication will surely move from analog communication technology to digital communication technology. In addition, the radio frequency has been re-planned and adjusted, and the original railway-specific 450 MHz frequency band will be taken back. Based on this requirement, a 400 MHz frequency band train digital wireless dispatching communication system (railway DRTD system) has been established, and the project has been launched to carry out the business application planning and key technology research work for the 400 MHz frequency band in railways. The railway DRTD system bears the main railway dispatching communication voice call and dispatching order information transmission services. These two railway dispatching communication services mainly adopt EMBC (Enhanced Multi-Frame Control Message) and packet data methods respectively. At present, the train digital wireless dispatching communication system has completed on-site trial assessment and is about to be popularized and equipped for use throughout the railway, but the corresponding test technology for the railway DRTD system is not yet perfect.

[0003] The Chinese invention patent "GSM-R Detection System and Detection Method" with the authorization announcement number CN103167529B proposes a railway GSM-R detection system and detection method, but this method is only applicable to the railway GSM-R system; it is not applicable to the newly developed railway DRTD system in railways, and the content of the test method mentioned in this patent is relatively less. The Chinese invention patent application "A Method and System for Detecting 5G-R Signals of High-Speed Trains Based on a Handheld Terminal" with the publication number CN115412881A provides a 5G-R signal detection scheme, but it is also not applicable to the railway DRTD system. Summary of the Invention

[0004] The object of the present invention is to provide a method and system for testing the quality of data transmission service of a railway DRTD system, which can be widely applied to the performance evaluation of the railway DRTD system, and is used for the daily commissioning, system joint commissioning and maintenance inspection of the railway DRTD system. It conforms to the actual application requirements and scenarios of the railway DRTD system, does not affect the normal business process of the railway DRTD system, has strong pertinence, and can support the operation and maintenance of the railway DRTD system.

[0005] The object of the present invention is achieved by the following technical solutions: A system for testing the quality of data transmission service of a railway DRTD system, comprising: On-vehicle test equipment and ground test equipment, wherein the on-vehicle test equipment is communicatively connected to a fixed radio station of the railway DRTD system, and the ground test equipment is communicatively connected to a digital train dispatching interface server of the railway DRTD system; the on-vehicle test equipment and the ground test equipment cooperate to simulate the EMBC and packet data communication processes of the railway DRTD system, send and receive EMBC and packet data between the on-vehicle test equipment and the ground test equipment, and complete the quality test of EMBC and packet data transmission service; the railway DRTD system is a train digital wireless dispatching communication system in the 400 MHz frequency band; the EMBC is an enhanced multi-frame control message. Among them, the quality test of EMBC and packet data transmission service includes: Quality test of EMBC data transmission service: The on-vehicle test equipment cyclically sends EMBC test data at a set time interval, the fixed radio station determines the receiving end according to 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 back to the on-vehicle test equipment in a transparent backhaul manner. The on-vehicle test equipment counts the time of the received EMBC test data and the content of the characteristic data it contains, and calculates the quality of EMBC data transmission service. Quality test of packet data transmission service: The on-vehicle 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 quality of packet data transmission service according to 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; among them, in the process of the quality test of packet data transmission service, when the sending end is the on-vehicle 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-vehicle test equipment.

[0006] A method for testing the quality of data transmission service of a railway DRTD system, implemented based on the foregoing system, the method includes: By cooperating the on-vehicle test equipment with the ground test equipment, simulating the EMBC and packet data communication processes of the railway DRTD system, sending and receiving EMBC and packet data between the on-vehicle test equipment and the ground test equipment, and completing the quality of service test for EMBC and packet data transmission; Among them, the quality of service test for EMBC and packet data transmission includes: Quality of service test for EMBC data transmission: The on-vehicle test equipment cyclically sends EMBC test data at a set time interval. The fixed radio 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 back to the on-vehicle test equipment in the original path through transparent feedback. The on-vehicle test equipment counts the time of the received EMBC test data and the content of the characteristic data it contains, and calculates the quality of service of EMBC data transmission; Quality of service test for packet data transmission: The on-vehicle test equipment sends control commands related to packet data transfer test to the ground test equipment through the railway DRTD system to start the quality of service test for transmission. The ground test equipment calculates the quality of service of packet data transmission according to 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. Among them, in the process of the quality of service test for packet data transmission, when the sending end is the on-vehicle 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-vehicle test equipment.

[0007] It can be seen from the technical solutions provided by the present invention described above that it is possible to test the quality of service of EMBC data transmission of the main equipment network elements in the railway DRTD system, and at the same time provide a method for testing and verifying the data services mainly carried by the packet data of the railway DRTD system. It can be widely used in the performance evaluation, daily debugging, system joint debugging and maintenance inspection of the railway DRTD system, conforms to the actual application requirements and scenarios of the railway DRTD system, does not affect the normal business process of the railway DRTD system, has strong pertinence, and can provide new methods and technical means for the operation and maintenance test of the railway DRTD system, ensuring train operation safety. Description of the Drawings

[0008] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description 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.

[0009] Figure 1 It is a schematic diagram of a system for testing the quality of service of data transmission in a railway DRTD system provided by an embodiment of the present invention; Figure 2 Schematic diagram of the data transmission process for the fixed radio station control device as the receiving end provided by the embodiments of the present invention; Figure 3 Schematic diagram of the data transmission process for the interface server as the receiving end provided by the embodiments of the present invention; Figure 4 Schematic diagram of the data transmission process for the ground test equipment as the receiving end provided by the embodiments of the present invention; Figure 5 Schematic diagram of the simulation railway dispatching order test process provided by the embodiments of the present invention; Figure 6 Schematic diagram of the simulation train number verification information test process provided by the embodiments of the present invention; Figure 7 Schematic diagram of the ground test equipment control process initiated by the on-vehicle test equipment provided by the embodiments of the present invention. Detailed implementation manners

[0010] Next, in combination with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0011] First, the following explanations are given for the terms that may be used in this article: The description of the terms "include", "comprise", "contain", "have" or other similar semantics should be interpreted as non-exclusive inclusion. For example: including a certain technical feature element (such as raw material, component, ingredient, carrier, dosage form, material, size, part, component, mechanism, device, step, process, method, reaction condition, processing condition, parameter, algorithm, signal, data, product or article, etc.) should be interpreted as not only including the clearly listed certain technical feature element, but also including other well-known technical feature elements in the art that are not clearly listed.

[0012] The term "consisting of" means excluding any technical feature element that is not clearly listed. If this term is used in a claim, this term will make the claim a closed type, so that it does not include technical feature elements other than the clearly listed technical feature elements, except for the related conventional impurities. If this term only appears in a sub-clause of a claim, then it only limits the elements clearly listed in that sub-clause, and the elements recorded in other sub-clauses are not excluded from the overall claim.

[0013] Unless otherwise clearly specified or defined, terms such as "installation", "connection", "linkage", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this text can be understood according to specific circumstances.

[0014] The following will describe in detail a method and system for testing the quality of data transmission service of a railway DRTD system provided by the present invention. The content not described in detail in the embodiments of the present invention belongs to the prior art well-known to those of ordinary skill in the art. For the conditions not specified in the embodiments of the present invention, they are carried out according to the conventional conditions in the art or the conditions recommended by the manufacturer. For the instruments used in the embodiments of the present invention without indicating the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0015] Embodiment 1 As Figure 1 shown, it is a schematic diagram of a system for testing the quality of data transmission service of a railway DRTD system, mainly including: On-vehicle test equipment and ground test equipment. The on-vehicle test equipment is wirelessly communicatively connected to the fixed radio station of the railway DRTD system, and the ground test equipment is wired communicatively connected to the digital train dispatching interface server of the railway DRTD system; the on-vehicle test equipment and the ground test equipment cooperate to simulate the EMBC and packet data communication processes of the railway DRTD system, send and receive EMBC and packet data between the on-vehicle test equipment and the ground test equipment, and complete the quality test of EMBC and packet data transmission service.

[0016] The on-vehicle test equipment and the ground test equipment cooperate to simulate the EMBC and packet data communication processes with the railway DRTD system, perform the sending and receiving of EMBC and packet data between the on-vehicle test equipment and the ground test equipment through the railway DRTD system, and complete the quality test of EMBC and packet data transmission service, mainly including the following test contents: (1) Quality test of EMBC data transmission service: The on-vehicle test equipment cyclically sends EMBC test data at a set time interval. The fixed radio 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 back to the on-vehicle test equipment in the original way through transparent feedback. The on-vehicle test equipment counts the time of the received EMBC test data and the content of the characteristic data it contains, and calculates the quality of EMBC data transmission service.

[0017] In an embodiment of the present invention, the receiving end may be a device network element in a railway DRTD system or a ground test device. If the receiving end is a fixed radio station, the fixed radio station directly returns a response message to the vehicle-mounted test device and sends the EMBC test data to the vehicle-mounted test device in a transparent transmission manner; if the receiving end is not a fixed radio station (for example, other device network elements in the railway DRTD system except the fixed radio station, or a ground test device), the fixed radio station sends the EMBC test data to the receiving end according to the transmission channel and returns a response message to the vehicle-mounted test device. After receiving the EMBC test data, the device network elements in the transmission channel each return a confirmation message to the previous device network element and transparently transmit it to the next device network element in the transmission channel. When reaching the receiving end, the receiving end transmits the EMBC test data back to the vehicle-mounted test device along the original path of the transmission channel in a transparent transmission manner; wherein, the transmission channel refers to the communication channel from the fixed radio station to the digital train dispatching interface server in the railway DRTD system, and the device network element refers to each device in the transmission channel.

[0018] In an embodiment of the present invention, the vehicle-mounted test device counts the time of the received EMBC test data and the content of the characteristic data included therein. Calculating the EMBC data transmission service quality includes: the vehicle-mounted test device 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 vehicle-mounted test device records the number of lost packets of the EMBC test data according to the characteristic data in the received EMBC test data and calculates the packet loss rate in combination with the total number of the sent EMBC test data; both the transmission delay and the packet loss rate are indicators of the EMBC data transmission service quality.

[0019] Those skilled in the art can understand that transparent transmission means directly returning the received data. In the present invention, the receiving end directly returns the received EMBC test data to the sending end. For the sending end, it can count whether packets are lost according to the packet number and the check bit in the characteristic data of the received EMBC test data and determine the number of lost packets.

[0020] (2) Packet data transmission service quality test: The vehicle-mounted test device sends control commands related to packet data transmission test to the ground test device through the railway DRTD system to start the transmission service quality test. The ground test device calculates the packet data transmission service quality according to 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 process of the packet data transmission service quality test, when the sending end is the vehicle-mounted test device, the receiving end is the ground test device; when the sending end is the ground test device, the receiving end is the vehicle-mounted test device.

[0021] In an embodiment of the present invention, the packet test data in the packet data transmission service quality test process may be simulated railway dispatching commands or simulated train number verification information.

[0022] (2.1) When the packet test data is simulated railway dispatching commands, the ground test device is the sending end, and the on-vehicle test device is the receiving end; the ground test device calculates the transmission success rate of the railway dispatching commands 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-vehicle test device.

[0023] (2.2) When the packet test data is simulated train number verification information, the ground test device is the receiving end, and the on-vehicle test device is the sending end; the ground test device calculates the transmission success rate of the train number verification information according to the total number of simulated train number verification information sent by the on-vehicle test device and the total number of simulated train number verification information successfully received by itself.

[0024] The transmission success rate of the dispatching commands and the transmission success rate of the train number verification information obtained in the above test process are both indicators of the packet data transmission service quality.

[0025] Preferably, the process by which the on-vehicle test device sends control commands related to the packet data transmission test to the ground test device through the railway DRTD system includes: The on-vehicle test device sends test-related control commands to the ground test device through the railway DRTD system. The test-related control commands are transmitted to the ground test device through the transmission channel in the railway DRTD system. After receiving the test-related control commands, the device network elements in the transmission channel each send a confirmation message to the previous device network element and transparently transmit it to the next device network element in the transmission channel; when the ground test device receives the test-related control commands, it replies with a control command response (indicating the response to receiving the control command) and transmits it back to the on-vehicle test device along the original path of the transmission channel; wherein, the transmission channel refers to the communication channel from the fixed radio station to the digital train dispatching interface server in the railway DRTD system, and the device network element refers to each device in the transmission channel.

[0026] Preferably, the method further includes: the on-vehicle test device performs activity detection through communication response with the fixed radio station; and, two-way activity detection is performed between the ground test device and the digital train dispatching interface server.

[0027] The embodiments of the present invention propose a test method for the data transmission service quality test of the railway DRTD system. This method can test the effectiveness and timeliness of the data transmission of the main equipment network element EMBC in the railway DRTD system, and at the same time provides a method for the test and verification of the scheduling communication data service, which is the key bearing of the packet data in the railway DRTD system. It can be widely used in the performance evaluation, daily debugging, system joint debugging and maintenance inspection of the railway DRTD system, conforms to the actual application requirements and scenarios of the railway DRTD system, does not affect the normal business process of the railway DRTD system, has strong pertinence, and can provide new methods and technical means for the operation and maintenance test of the railway DRTD system.

[0028] In order to more clearly show the technical solutions provided by the present invention and the technical effects produced, the following uses specific embodiments to describe in detail the method provided by the embodiments of the present invention.

[0029] I. System architecture.

[0030] Also refer to the foregoing Figure 1 , the entire system mainly includes: on-vehicle test equipment and ground test equipment. The on-vehicle test system is installed on the test vehicle as the on-vehicle test equipment, simulating the on-vehicle equipment of the railway DRTD system to complete the sending of railway DRTD system data (including EMBC and packet data), test data acquisition and statistics. The on-vehicle test equipment is connected to the fixed radio station of the railway DRTD system through the air interface (radio interface). The ground test equipment is installed in the central computer room of the railway DRTD system and is interconnected with the digital train dispatching interface server of the railway DRTD system to cooperate with the on-vehicle test equipment to complete the data service quality test.

[0031] In the embodiments of the present invention, the on-vehicle 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 the test-related processes. The ground test equipment mainly includes a second controller and a switch. The second controller receives the control commands of the on-vehicle test equipment and performs data sending and receiving through the switch to cooperate with the on-vehicle test equipment to complete the data transmission service quality test.

[0032] In the embodiments of the present invention, the data service quality test mainly involves the EMBC and packet data transmission service quality tests. 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 equipment network elements such as the fixed radio station, fixed radio station controller, and digital train dispatching interface server of the railway DRTD system. The following provides a detailed introduction to the data transmission service quality test based on the cooperation of the on-vehicle test equipment and the ground test equipment.

[0033] II. EMBC and packet data transmission service quality test scheme.

[0034] 1. EMBC Data Transmission Service Quality Test Plan.

[0035] Since the services carried by the EMBC of the railway DRTD system all use single EMBC packets, for application scenarios with a large amount of service data, the application devices of the railway DRTD system divide the service data into multiple EMBC packets for transmission. The receiving end reorganizes the data according to the characteristic packet numbers. In view of this, the EMBC data transmission service quality test adopts the single EMBC packet method.

[0036] (1) Overall test process.

[0037] (1.1) The on-vehicle test equipment sends data through the air interface of the railway DRTD system. During the test, the single-packet EMBC test data is cyclically sent at a certain time interval. The EMBC test data carries characteristic data such as packet numbers, packet lengths, receiving-end device numbers, and check bits. The data sending time interval needs to be defined according to the specification parameters of the railway DRTD system to avoid abnormal packet loss caused by the sending time interval.

[0038] (1.2) After the EMBC test data reaches the network element of the railway DRTD system device (for example, the fixed radio station first) through the transmission channel, the network element determines whether the data is transparently transmitted or transparently looped back according to the characteristic data in the test data packet. When the receiving end transparently loops back, it quickly loops back and forwards it to the sending end. Here, the sending end is the on-vehicle test equipment, and the receiving end is a specific network element of the device or the ground test equipment.

[0039] (1.3) The on-vehicle test equipment collects the time interval from the start of transmitting the first bit of the EMBC test data to the receipt of the last bit of the same EMBC test data transparently looped back as the transmission time of the corresponding EMBC test data.

[0040] (1.4) The on-vehicle test equipment records the number of lost packets of the EMBC test data according to 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 packets sent by itself.

[0041] In the embodiments of the present invention, the EMBC test data carries consecutive packet numbers and check bits. The situation where the check of the transparently looped-back EMBC test data fails or the packet numbers are not consecutive belongs to the case of lost packets.

[0042] (2) Data transmission process when the receiving end is different devices.

[0043] The EMBC test data transmission test completes the transmission delay and packet loss rate tests through data loopback among the on-vehicle test equipment, each device network element of the railway DRTD system, and the ground test equipment. When the fixed radio station receives the EMBC test data, regardless of whether it is the receiving end, it needs to reply with a frame of acknowledgment message. When the receiving end is the fixed radio station control equipment, the digital train communication interface server, or the ground test equipment, the data is transparently transmitted to the corresponding receiving end, and the corresponding receiving end then replies with a frame of acknowledgment. When the receiving end is not the fixed radio station, the data transmission process when the receiving end of the EMBC data transmission test is different devices is as follows Figures 2 to 4 shown. The corresponding receiving ends in sequence are the fixed radio station control equipment, the digital train communication interface server, and the ground test equipment; the "air interface" in front of each piece of information or command in the figure indicates transmission through the air interface, and the symbols in parentheses indicate the execution order of the process shown in the corresponding attached figure.

[0044] Figure 2 In, the receiving end is the fixed radio station control equipment. The fixed radio station receives the EMBC test data transmitted through the air interface (denoted as A1H), replies with an acknowledgment message. The sender of the acknowledgment message is the fixed radio station, and the EMBC test data is transparently transmitted to the fixed radio station control equipment. The fixed radio station control equipment replies with an acknowledgment message to the fixed radio station, and, in the way of transparent backhaul, replies with the EMBC test data (denoted as A2H), the content of which is the same as the EMBC test data (A1H). After receiving the EMBC test data (A2H), the fixed radio station replies with an acknowledgment message to the fixed radio station control equipment, and forwards the EMBC test data (A2H) to the on-vehicle test equipment through the air interface, and indicates that the sender is the fixed radio station control equipment.

[0045] Figure 3 In, the receiving end is the digital train communication interface server. On the basis of Figure 2 , the interaction process between the digital train communication interface server and the fixed radio station control equipment is added. The principle is similar to the interaction process between the fixed radio station control equipment and the fixed radio station in Figure 2 , that is, after receiving the EMBC test data (denoted as A1H) as the receiving end, the digital train communication interface server replies with an acknowledgment message to the fixed radio station control equipment, and replies with the EMBC test data (the content is the same as A1H) in the way of transparent backhaul. After receiving this message, the fixed radio station control equipment replies with an acknowledgment message to the digital train communication interface server.

[0046] Figure 4 In, the receiving end is the ground test equipment. On the basis of Figure 3 , the interaction process between the digital train communication interface server and the ground test equipment is added, and the principle is also similar, so it will not be elaborated here.

[0047] 2. Packet data transmission service quality test scheme.

[0048] Since the railway dispatching order messages carried by the packet data of the railway DRTD system mainly include railway dispatching orders and train number verification information, in order to conform to the actual application of the railway DRTD system and truly reflect the status of the railway DRTD system, the quality of packet data transmission service is carried out in the way of simulating the transmission of railway dispatching order messages, including simulating the transmission of railway dispatching orders and train number verification information. In order not to affect the normal dispatching communication operation of the railway DRTD system and at the same time simulate the actual application mode to achieve isolation from the train control system, both the simulated railway dispatching order and the train number verification information include a test-specific locomotive number and a train number. The digital train dispatching interface server of the railway DRTD system judges whether it is test data according to the test-specific locomotive number and the train number.

[0049] The test-specific locomotive numbers are collectively referred to as 8 digits, part of which are fixed values and the other part are railway administration and vehicle type identifications; for example: the first 4 digits are fixed values (for example, fixed as 9), the 5th to 6th digits are railway administration identifications, the 7th digit is the vehicle type identification, and the 8th digit is the number; of course, the specific setting method can be set by the user according to the actual situation, and the present invention does not make any restrictions.

[0050] The test-specific train numbers can also be set according to the actual situation or experience, as long as they can be distinguished from the train numbers of normal trains. Table 1 shows an example of the numbering of test-specific train numbers.

[0051] Table 1: Numbering of Test-Specific Train Numbers Field Alphabetic part Numeric part Meaning DJ or JJ Numbering starts from 9901

[0052] (2.1) Test process for simulating railway dispatching orders.

[0053] As Figure 5 shown, the test process mainly includes: (A1) The on-vehicle test equipment sends test-related control commands to the ground test equipment through the railway DRTD system to start the test of the transmission service quality (specifically, to start the test of simulating railway dispatching orders here). The ground test equipment sends a response through the railway DRTD system and enters the dispatching order test state; the ground test equipment sends simulated railway dispatching orders in the way of the packet data of the railway DRTD system and records the number of the sent simulated railway dispatching order messages.

[0054] Exemplarily, the sending interval is not less than 60s, the total number of sent messages is not less than 200, and the format of the simulated dispatching order messages conforms to the relevant regulations of railway-related standards.

[0055] (A2) The on-vehicle test equipment receives and displays the railway dispatching order information through the railway DRTD system, and returns the automatic receipt and manual confirmation of the dispatching order to the ground test equipment through the railway DRTD system.

[0056] (A3) The ground test equipment confirms whether the simulated railway dispatching order is successful according to the automatic receipt and manual confirmation information returned by the on-vehicle test equipment, counts the total number of successfully received simulated railway dispatching orders, and calculates the transmission success rate of the railway dispatching order in combination with the total number of sent simulated railway dispatching orders: Transmission success rate of railway dispatching order = (Total number of successfully received simulated railway dispatching orders / Total number of sent simulated railway dispatching orders) × 100%.

[0057] (A4) The ground test equipment returns the transmission success rate of the railway dispatching order (test result) to the on-vehicle test equipment in real time through the railway DRTD system.

[0058] (A5) At the end of the test, the on-vehicle 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.

[0059] (2.2) Test process for simulating train number verification information.

[0060] As Figure 6 shown, the test process mainly includes: (B1) The on-vehicle 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 simulating train number verification information here). The ground test equipment responds through the railway DRTD system and enters the train number verification information test state. The on-vehicle test equipment sends the simulated train number verification information in the form of packet data of the railway DRTD system and records the number of sent train number verification information.

[0061] Exemplarily, the sending interval is random, the total number of sent is not less than 200, and the format of the simulated train number verification information conforms to the relevant regulations of railway standards.

[0062] (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 according to the serial number of the train number verification information, and calculates the transmission success rate of the train number verification information: Transmission success rate of train number verification information = (Total number of successfully received simulated train number verification information / Total number of sent simulated train number verification information) × 100%.

[0063] (B3) The ground test equipment returns the transmission success rate of the train number verification information (test result) to the on-vehicle test equipment in real time through the railway DRTD system.

[0064] At the end of the test, the on-vehicle test equipment sends a test end command to the ground test equipment through the EMBC data of the railway DRTD system, and the ground test equipment sends a test stop response through the railway DRTD system.

[0065] (2.3)Control command transmission process between the on-vehicle test equipment and the ground test equipment.

[0066] This part mainly introduces the control command transmission process related to testing between the on-vehicle test equipment and the ground test equipment involved in the foregoing (A1) and (B1). The on-vehicle test equipment issues control commands related to testing to the ground test equipment through the railway DRTD system, and the ground test equipment returns control command responses and sends test data to the on-vehicle test equipment (that is, the simulated railway dispatching commands and the simulated train number verification information mentioned above). The following two control commands related to testing are collectively referred to as ground test equipment control commands.

[0067] When the control command is not "fixed radio station reply response", the process of transparent transmission of the control command between the ground test equipment is as Figure 7 shown. First, the on-vehicle test equipment sends the ground test equipment control command (denoted as A3H) to the fixed radio station through the air interface. Then, it is transparently transmitted to the ground test equipment through the fixed radio station, the fixed radio station control equipment, and the digital train control interface server in sequence. In this process, after each device network element and the ground test equipment receive the ground test equipment control command (A3H), they all reply with a confirmation message to the upper level; the ground test equipment will reply with a ground test equipment control command response (denoted as A4H) and return it to the on-vehicle test equipment along the original path. In this process, each device network element will reply with a confirmation message to the upper level; when the on-vehicle test equipment receives the ground test equipment control command response, it enters the corresponding test state.

[0068] In the above process, when sending information or commands to the on-vehicle test equipment or the ground test equipment through the railway DRTD system, the EMBC data method is used for sending.

[0069] III. Activity detection.

[0070] To prevent the influence of factors such as the abnormal disconnection of the on-vehicle test equipment from the railway DRTD system and the abnormality of the ground test equipment or the interruption of the connection with the railway DRTD system on the test results, it is necessary to conduct activity detection between the test equipment (on-vehicle test equipment and ground test equipment) and the railway DRTD system.

[0071] According to the railway DRTD system specification, during the test process, the on-vehicle test equipment can conduct activity detection by responding to the train number query information sent by the fixed radio station every 175s, avoiding the cancellation of the on-vehicle test equipment by the railway DRTD system during the system test process and preventing disconnection.

[0072] Perform two-way activity detection between the ground test equipment and the digital train communication interface server of the railway DRTD system. The activity detection uses UDP (User Datagram Protocol) with confirmation and no retransmission. Exemplarily, the activity detection time is 5 seconds. When the activity detection confirmation is not received continuously for 3 times, it is determined that the activity detection fails. At this time, stop performing other services and continue to attempt activity detection.

[0073] Embodiment 2 The embodiment of the present invention also provides a method for testing the quality of data transmission service of a railway DRTD system, which is mainly implemented based on the system provided in the foregoing embodiment. The method mainly includes: Cooperate the on-vehicle test equipment with the ground test equipment to simulate the EMBC and packet data communication processes of the railway DRTD system. Between the on-vehicle test equipment and the ground test equipment, send and receive EMBC and packet data, and complete the quality test of EMBC and packet data transmission services; Among them, the quality test of EMBC and packet data transmission services includes: Quality test of EMBC data transmission: The on-vehicle test equipment cyclically sends EMBC test data at a set time interval. The fixed radio 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 back to the on-vehicle test equipment in a transparent return manner. The on-vehicle test equipment counts the time of the received EMBC test data and the content of the characteristic data it contains, and calculates the quality of EMBC data transmission; Quality test of packet data transmission: The on-vehicle test equipment sends control commands related to packet data transfer test to the ground test equipment through the railway DRTD system to start the quality test of transmission service. The ground test equipment calculates the quality of packet data transmission according to 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. Among them, in the process of the quality test of packet data transmission, when the sending end is the on-vehicle 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-vehicle test equipment.

[0074] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiments can be implemented by software or by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solutions of the above embodiments can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0075] As described above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims. The information disclosed in the background art part 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 this information constitutes the 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: The on-board test equipment and the ground test equipment are connected in communication with the fixed radio station of the railway DRTD system, and the ground test equipment is connected in communication with the digital train modulation interface server of the railway DRTD system; the on-board test equipment cooperates with the ground test equipment to simulate the EMBC and packet data communication process of the railway DRTD system, and performs the sending and receiving of EMBC and packet data between the on-board test equipment and the ground test equipment, and completes the EMBC and packet data transmission service quality test; the railway DRTD system is a 400MHz frequency band train digital wireless dispatching communication system; The EMBC is an enhanced multi-frame control message; Among them, EMBC and packet data transmission service quality tests include: EMBC data transmission service quality test: the vehicle-mounted test equipment cyclically sends EMBC test data at set time intervals, the fixed radio 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 in the original path by transparent backhaul. The vehicle-mounted 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; 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.

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 in the original path by transparent return transmission, including: If the receiving end is a fixed radio station, the fixed radio station directly replies a response message to the vehicle-mounted test equipment, and sends the EMBC test data to the vehicle-mounted test equipment by transparent return transmission; 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 previous 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 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 vehicle-mounted 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 including: The vehicle-mounted 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 vehicle-mounted test equipment records the number of packet losses of the EMBC test data according to 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.

4. A railway DRTD system data transmission service quality test system according to any one of claims 1 to 3, characterized in that: The characteristic data in the EMBC test data include: packet number, packet length, receiving end device number and check digit.

5. 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 number of packet test data sent by the sending end and the total number 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 equipment is a sending end, and the vehicle-mounted test equipment 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 vehicle-mounted test equipment; The railway dispatch command transmission success rate is an indicator of the packet data transmission service quality.

6. 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 number of packet test data sent by the sending end and the total number 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 a receiving end, and the vehicle-mounted test equipment is a sending end; The ground test equipment calculates the success rate of the train number verification information transmission according to the total number of simulated train number verification information sent by the vehicle-mounted test equipment and the total number of simulated train number verification information successfully received by itself; The train number verification information transmission success rate is an indicator of the packet data transmission service quality.

7. 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.

8. 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; And, two-way activity detection is performed between the ground test equipment and the digital train modulation interface server.

9. 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 8, the method comprises: 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, the 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; Among them, EMBC and packet data transmission service quality tests include: EMBC data transmission service quality test: the vehicle-mounted test equipment cyclically sends EMBC test data at set time intervals, the fixed radio 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 in the original path by transparent backhaul. The vehicle-mounted 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; 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.

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