A test method and test terminal for vehicle-ground wireless communication system

Abstract

The present application provides a test method and test terminal for a vehicle-to-ground wireless communication system, wherein the method includes: in an environment without interference from interference sources, obtaining the first position of the rail vehicle when the communication link of the rail vehicle is transferred from the first cell base station to the second cell base station; in an environment with interference from interference sources, obtaining the second position of the rail vehicle when the communication link of the rail vehicle is transferred from the first cell base station to the second cell base station; judging whether the distance difference between the second position and the first position is greater than a preset distance threshold, if the distance difference is greater than the preset distance threshold, determining that the switching function is abnormal; if the distance difference is less than or equal to the preset distance threshold, determining that the switching function is normal. This method can reliably detect whether there is an abnormality in the switching function of base stations between adjacent cells before light rail vehicles such as cloud buses and light rails are put into operation, eliminating safety hazards.

Description

Technical Field

[0001] The present application belongs to the field of wireless communication technology, and in particular, relates to a test method and a test terminal for a vehicle-ground wireless communication system. Background Art

[0002] In rail transit, base stations are an important part of the vehicle-ground wireless communication system. When rail vehicles are running along the track, the base stations along the track transmit the operation control, traction and positioning data of the rail vehicles to the ground control center. At the same time, the control commands issued by the ground control center are also transmitted to the rail vehicles through the above-mentioned base stations.

[0003] In recent years, light rail transit vehicles such as Yunba and light rail have attracted widespread attention due to their lightness and flexibility. They usually need to shuttle between urban communities, which requires the installation of corresponding base stations in the communities. When Yunba, light rail and other light rail vehicles pass through adjacent communities, the switching of base stations between adjacent communities needs to be completed. However, the inventors found that when Yunba, light rail and other light rail vehicles pass through the overlapping switching area covered by the base stations of adjacent communities, they are susceptible to interference from interference sources, resulting in abnormal switching functions of base stations between adjacent communities, which in turn poses a safety hazard to the operation of Yunba, light rail and other light rail vehicles.

[0004] Therefore, a testing method for a vehicle-to-ground wireless communication system is needed, which can reliably detect whether there is an abnormality in the switching function of base stations between adjacent cells before light rail vehicles such as Yunba and light rail are put into operation. Summary of the invention

[0005] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0006] To this end, the first purpose of this application is to propose a test method for a vehicle-ground wireless communication system. The method can reliably detect whether there is an abnormality in the switching function of base stations between adjacent cells before light rail vehicles such as cloud buses and light rails are put into operation, eliminating safety hazards.

[0007] The second object of the present application is a test terminal.

[0008] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a method for testing a vehicle-ground wireless communication system, the method comprising the following steps:

[0009] In an environment without interference from interference sources, obtaining a first position of the rail vehicle when a communication link of the rail vehicle is transferred from a first cell base station to a second cell base station, the first cell base station is arranged in a first cell, the second cell base station is arranged in a second cell, and the first cell and the second cell are adjacent cells;

[0010] In an environment where there is interference from an interference source, obtaining a second position of the rail vehicle when a communication link of the rail vehicle is transferred from a first cell base station to a second cell base station, the interference source being located in the first cell or the second cell;

[0011] Determine whether the distance difference between the second position and the first position is greater than a preset distance threshold. If the distance difference is greater than the preset distance threshold, determine that the switching function is abnormal; if the distance difference is less than or equal to the preset distance threshold, determine that the switching function is normal.

[0012] A second aspect of the present application provides a test terminal, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the test method for the vehicle-to-ground wireless communication system as described above when executing the computer program.

[0013] The testing method of the vehicle-ground wireless communication system in the present application obtains the first position of the rail vehicle when the communication link of the rail vehicle is transferred from the first cell base station to the second cell base station in an environment without interference from interference sources, and the second position of the rail vehicle when the communication link of the rail vehicle is transferred from the first cell base station to the second cell base station in an environment with interference from interference sources. By judging whether the distance difference between the second position and the first position is greater than a preset distance threshold, it can be accurately determined whether there is an abnormality in the switching function of the base stations between adjacent cells, thereby avoiding safety hazards when the rail vehicle is officially put into operation.

[0014] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present application but do not constitute a limitation to the present application. In the accompanying drawings:

[0016] Figure 1 A schematic diagram of a scenario of a test method for a vehicle-to-ground wireless communication system provided in an embodiment of the present application;

[0017] Figure 2 A flowchart of a method for testing a vehicle-to-ground wireless communication system provided in an embodiment of the present application;

[0018] Figure 3 A flowchart of another method for testing a vehicle-to-ground wireless communication system provided in an embodiment of the present application;

[0019] Figure 4A flowchart of another method for testing a vehicle-to-ground wireless communication system provided in an embodiment of the present application;

[0020] Figure 5 A flowchart of another method for testing a vehicle-to-ground wireless communication system provided in an embodiment of the present application;

[0021] Figure 6 A flowchart of another method for testing a vehicle-to-ground wireless communication system provided in an embodiment of the present application;

[0022] Figure 7 A flowchart of another method for testing a vehicle-to-ground wireless communication system provided in an embodiment of the present application;

[0023] Figure 8 A flowchart of another method for testing a vehicle-to-ground wireless communication system provided in an embodiment of the present application;

[0024] Fig. 9 A flowchart of another method for testing a vehicle-to-ground wireless communication system provided in an embodiment of the present application;

[0025] Fig.10 A structural block diagram of a test terminal provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] In order to realize data transmission between light rail vehicles such as Yunbus and light rail and the ground control center, and to meet the needs of light rail vehicles such as Yunbus and light rail to shuttle between urban communities, corresponding base stations need to be set up in each community.

[0028] The inventors discovered that when light rail vehicles such as Yunbus and light rail pass through the switching overlapping area covered by adjacent cell base stations, that is, when light rail vehicles such as Yunbus and light rail pass through the switching overlapping area covered by the antenna of an adjacent cell base station, due to interference from interference sources, the signal received by light rail vehicles such as Yunbus and light rail from the new base station will be blocked, resulting in the switching position of light rail vehicles such as Yunbus and light rail drifting compared to the switching position not affected by the interference source when switching to the new base station. Since the coverage range of each base station antenna is limited, if the drift distance is too large, light rail vehicles such as Yunbus and light rail will not be able to conduct effective information exchange with the ground control center when traveling on the road section corresponding to the drift distance, thereby posing a safety hazard to the operation of light rail vehicles such as Yunbus and light rail.

[0029] That is to say, when light rail vehicles such as Yunba and light rail are put into operation, safety hazards arise due to abnormalities in the switching function of base stations between adjacent cells. To this end, an embodiment of the present application provides a test method for a vehicle-to-ground wireless communication system, which can reliably detect whether there are abnormalities in the switching function of base stations between adjacent cells before light rail vehicles such as Yunba and light rail are put into operation, thereby eliminating safety hazards.

[0030] The implementation of the technical solution of the present application is further described in detail below in conjunction with the accompanying drawings.

[0031] like Figure 1 and Figure 2 As shown, the test method of the vehicle-to-ground wireless communication system is applied to a test terminal, which includes the following steps:

[0032] Step 101, in an environment without interference sources, obtain the first position of the rail vehicle when the communication link of the rail vehicle is transferred from the first cell base station to the second cell base station, the first cell base station is set in the first cell, the second cell base station is set in the second cell, and the first cell and the second cell are adjacent cells.

[0033] In the embodiment of the present application, the first position may be obtained from a positioning module of the rail vehicle, or may be obtained from an onboard controller of the rail vehicle, which is not specifically limited in the present application.

[0034] As a possible implementation, Figure 3 As shown, step 101 specifically includes the following steps:

[0035] Step 201: In an environment without interference from interference sources, control a rail vehicle to drive from a first cell to a second cell, and obtain the position of the rail vehicle in real time.

[0036] In one embodiment of the present application, an environment without interference sources means that there are no interference sources along the track or in the cell that affect the rail vehicle's reception of base station signals. In this environment, the test terminal sends a traction control instruction to the on-board controller, the on-board controller receives the traction control instruction, and controls the rail vehicle to drive from the first cell to the second cell, and obtains the position of the rail vehicle in real time.

[0037] In another embodiment of the present application, in an environment without interference from interference sources, the test terminal reminds the driver to control the rail vehicle from the first cell to the second cell, and obtains the position of the rail vehicle in real time.

[0038] It should be noted that the rail vehicle can be controlled to travel from the first area to the second area at a uniform speed, or the rail vehicle can be controlled to travel from the first area to the second area at a non-uniform speed. When the rail vehicle is controlled to travel from the first area to the second area at a uniform speed, the test results can be more accurate. In addition, when the rail vehicle is controlled to travel from the first area to the second area at a uniform speed, the speed of the rail vehicle can be 5km / h or 10km / h, and no specific limitation is made in this application.

[0039] Step 202: When the communication link between the rail vehicle and the second cell base station is established and the communication link between the rail vehicle and the first cell base station is disconnected, the position of the rail vehicle at this time is marked as the first position.

[0040] In an embodiment of the present application, during the process of the rail vehicle driving from the first cell to the second cell, the rail vehicle first establishes a connection with the communication link of the first cell base station. When the switching condition of the base station is met, the rail vehicle establishes a connection with the communication link of the second cell base station, and the rail vehicle disconnects the communication link with the first cell base station, and the position of the rail vehicle at this time is marked as the first position. It should be understood that after the switching of the base station is completed, the communication link between the rail vehicle and the second cell base station is in a connected state for a period of time, and the communication link between the rail vehicle and the first cell base station is in a disconnected state, and the first position in the present application refers to the position of the rail vehicle at the initial moment when the rail vehicle is in a state where the communication link with the second cell base station is connected and the communication link with the first cell base station is disconnected in an environment without interference from interference sources.

[0041] As a possible implementation, Figure 4 As shown, before executing step 202, it also includes the following steps to determine whether the switching condition of the base station is met:

[0042] Step 301: Acquire the signal strengths of the first cell base station and the second cell base station in real time.

[0043] In the embodiment of the present application, the signal strength of the first cell base station and the second cell base station can be obtained from an on-board access unit in the rail vehicle, such as TAU, or from a communication monitoring terminal in the rail vehicle, such as a network tester.

[0044] Step 302: When the signal strength of the second cell base station is greater than the signal strength of the first cell base station, the rail vehicle establishes a communication link with the second cell base station, and disconnects the communication link with the first cell base station.

[0045] In an embodiment of the present application, when the signal strength of the second cell base station is greater than the signal strength of the first cell base station, the test terminal or the on-board controller controls the rail vehicle to perform an operation of registering the second cell base station so that the rail vehicle establishes a communication link with the second cell base station, and controls the rail vehicle to perform an operation of canceling the first cell base station so that the rail vehicle disconnects the communication link with the first cell base station.

[0046] As another possible implementation, a preset position may be pre-set. When the rail vehicle travels to the preset position, the base station is switched. The preset position may be set at the first position or at a position close to the first position. This is not specifically limited in the present application.

[0047] Step 102: Under an environment with interference from an interference source, obtain a second position of the rail vehicle when the communication link of the rail vehicle is transferred from a first cell base station to a second cell base station, and the interference source is located in the first cell or the second cell.

[0048] In the embodiment of the present application, the interference source is a drone carrying a radio jammer. Through the combination of the drone and the radio jammer, the interference source simulation at any position in the test space is realized. It should be noted that the number of interference sources can be one or more, which is not specifically limited in the present application.

[0049] As a possible implementation, Figure 5 As shown, step 102 specifically includes the following steps:

[0050] Step 401, control the drone to fly and hover within a target range, where the target range is a sector range covered by the antenna of the second cell base station.

[0051] In an embodiment of the present application, after the antenna of the second cell base station is arranged, the ground control center or the test terminal can determine the sector range covered by the antenna of the second cell base station according to the pitch angle of the antenna of the second cell base station and the power of the emitted signal. The sector range is the target range. The test terminal generates a flight control instruction based on the target range and sends the flight control instruction to the drone. The drone flies into the target range according to the flight control instruction and hovers at any position within the target range.

[0052] As a possible implementation, Figure 6 As shown, step 401 specifically includes the following steps:

[0053] Step 501, obtaining the position of the vehicle-mounted antenna when the rail vehicle runs to a first position.

[0054] In one embodiment of the present application, a table may be pre-stored in the vehicle-mounted controller or the test terminal, the table including a mapping relationship between the position of the vehicle-mounted antenna and the position of the rail vehicle. That is, when the first position is determined, the position of the vehicle-mounted antenna corresponding to the first position may be queried from the table.

[0055] In another embodiment of the present application, a positioning module of the vehicle-mounted antenna may be provided on the rail vehicle, and the position of the vehicle-mounted antenna may be acquired through the positioning module of the vehicle-mounted antenna.

[0056] Step 502: Acquire the position of the antenna of the second cell base station.

[0057] In an embodiment of the present application, the test terminal may obtain the position of the antenna of the second cell base station from the ground control center, or may obtain the position of the antenna of the second cell base station from the memory of the test terminal, which is not specifically limited in the present application.

[0058] Specifically, when the second cell base station is deployed in the second cell, the position of the second cell base station can be determined, and the position of the antenna of the second cell base station is determined accordingly. The position of the antenna of the second cell base station can be pre-stored in the memory of the ground control center or the test terminal.

[0059] Step 503: Determine a target position according to the position of the vehicle-mounted antenna and the position of the antenna of the second cell base station, and the target position is within the target range.

[0060] In the embodiment of the present application, the midpoint of the line connecting the position of the vehicle-mounted antenna and the position of the antenna of the second cell base station is taken as the target position.

[0061] Step 504, controlling the drone to fly and hover at the target location.

[0062] In an embodiment of the present application, the test terminal sends a flight control instruction to the drone, the flight control instruction includes a target position, and the drone flies and hovers to the target position according to the flight control instruction.

[0063] Step 402: Control the drone to send out an interference signal, the frequency of the interference signal is consistent with the working frequency of the antenna of the second cell base station, and the power of the interference signal is adjustable.

[0064] In an embodiment of the present application, when the drone flies and hovers within the target range, the test terminal sends an interference control instruction to the drone, that is, controls the drone to send an interference signal, specifically controls the radio interference device to send an interference signal, and the frequency of the interference signal is consistent with the operating frequency of the antenna of the second cell base station.

[0065] As a possible implementation, the power of the interference signal can be set according to the historical data of the rail vehicle operation. Specifically, in the historical data of the rail vehicle operation, the maximum power of the interference source encountered is used as the power of the interference signal. In this way, the extreme conditions of the vehicle-ground wireless communication system can be tested.

[0066] In order to make the test result more accurate, as another possible implementation method, Figure 7 As shown, step 402 specifically includes the following steps:

[0067] Step 601: determine the target power of the interference signal according to the power of the signal sent by the target position and the antenna of the second cell base station.

[0068] In the embodiment of the present application, the target power can be calculated by the following formula:

[0069] P 目标 =S 1 / S 2 ×P;

[0070] Among them, P 目标 is the target power of the interference signal, S 1 is the distance between the target position and the first position, S 2 is the distance between the position of the antenna of the second base station and the first position, and P is the power of the signal emitted by the antenna of the second cell base station.

[0071] Step 602: Control the UAV to send out an interference signal of the target power.

[0072] In the embodiment of the present application, the test terminal sends an interference control instruction to the drone, and the interference control instruction includes the target power of the interference signal, thereby controlling the drone to emit an interference signal of the target power, specifically controlling the radio interference device to emit an interference signal of the target power. This design makes the interference signal emitted by the drone closer to the interference signal emitted by the interference source in actual situations, and the test results are more accurate.

[0073] Step 403, controlling the rail vehicle to travel from the first cell to the second cell, and obtaining the position of the rail vehicle in real time.

[0074] In one embodiment of the present application, the test terminal sends a traction control instruction to the on-board controller, the on-board controller receives the traction control instruction, controls the rail vehicle to travel from the first cell to the second cell, and obtains the position of the rail vehicle in real time.

[0075] In another embodiment of the present application, the test terminal reminds the driver to control the rail vehicle from the first area to the second area, and obtains the position of the rail vehicle in real time.

[0076] It should be noted that the rail vehicle can be controlled to travel from the first area to the second area at a uniform speed, or the rail vehicle can be controlled to travel from the first area to the second area at a non-uniform speed. When the rail vehicle is controlled to travel from the first area to the second area at a uniform speed, the test results can be more accurate. In addition, when the rail vehicle is controlled to travel from the first area to the second area at a uniform speed, the speed of the rail vehicle can be 5km / h or 10km / h, and no specific limitation is made in this application.

[0077] Step 404: when the rail vehicle establishes a communication link with the second cell base station and the rail vehicle disconnects from the communication link with the first cell base station, the position of the rail vehicle at this time is marked as the second position.

[0078] In an embodiment of the present application, during the process of the rail vehicle driving from the first cell to the second cell, the rail vehicle first establishes a connection with the communication link of the first cell base station. When the switching condition of the base station is met, the rail vehicle establishes a connection with the communication link of the second cell base station, and the rail vehicle disconnects the communication link with the first cell base station, and the position of the rail vehicle at this time is marked as the second position. It should be understood that after the switching of the base station is completed, the communication link between the rail vehicle and the second cell base station is in a connected state for a period of time, and the communication link between the rail vehicle and the first cell base station is in a disconnected state, and the second position in the present application refers to the position of the rail vehicle at the initial moment when the rail vehicle is in a state of connecting the communication link with the second cell base station and disconnecting the communication link with the first cell base station in an environment with interference sources.

[0079] As a possible implementation manner, before executing step 404, the method further includes determining whether a base station switching condition is met by performing the following steps:

[0080] Step 801: Acquire the signal strengths of a first cell base station and a second cell base station in real time.

[0081] In the embodiment of the present application, the signal strength of the first cell base station and the second cell base station can be obtained from an on-board access unit in the rail vehicle, such as TAU, or from a communication monitoring terminal in the rail vehicle, such as a network tester.

[0082] Step 802: When the signal strength of the second cell base station is greater than the signal strength of the first cell base station, the rail vehicle establishes a communication link with the second cell base station, and the rail vehicle disconnects the communication link with the first cell base station.

[0083] In an embodiment of the present application, when the signal strength of the second cell base station is greater than the signal strength of the first cell base station, the test terminal or the on-board controller controls the rail vehicle to perform an operation of registering the second cell base station so that the rail vehicle establishes a communication link with the second cell base station, and controls the rail vehicle to perform an operation of canceling the first cell base station so that the rail vehicle disconnects the communication link with the first cell base station.

[0084] As another possible implementation, a preset position may be pre-set. When the rail vehicle travels to the preset position, the base station is switched. The preset position may be set at the first position or at a position close to the first position. This is not specifically limited in the present application.

[0085] Step 103: determine whether the distance difference between the second position and the first position is greater than a preset distance threshold.

[0086] In the embodiment of the present application, the test terminal determines whether the switching function of the base station between adjacent cells is abnormal based on the distance difference between the second position and the first position. It should be noted that the preset distance threshold can be set according to the operation requirements of the rail vehicle, and can be set to 10m or 15m. This is not specifically limited in the present application. If the distance difference between the second position and the first position is less than or equal to the preset distance threshold, step 104 is executed; if the distance difference between the second position and the first position is greater than the preset distance threshold, step 105 is executed.

[0087] Step 104, determine that the switching function is normal.

[0088] Step 105: Determine that the switching function is abnormal.

[0089] The testing method of the vehicle-ground wireless communication system in the present application obtains the first position of the rail vehicle when the communication link of the rail vehicle is transferred from the first cell base station to the second cell base station in an environment without interference from interference sources, and the second position of the rail vehicle when the communication link of the rail vehicle is transferred from the first cell base station to the second cell base station in an environment with interference from interference sources. By judging whether the distance difference between the second position and the first position is greater than a preset distance threshold, it can be accurately determined whether there is an abnormality in the switching function of the base stations between adjacent cells, thereby avoiding safety hazards when the rail vehicle is officially put into operation.

[0090] As a possible implementation, Fig. 9 As shown, after executing step 105, the following steps are also included:

[0091] Step 106: rearrange the second cell base station or the antenna of the second cell base station.

[0092] In the embodiment of the present application, the staff may rearrange the second cell base station or the antenna of the second cell base station. Rearranging the second cell base station or the antenna of the second cell base station includes but is not limited to adjusting the position of the second cell base station, or adjusting the position of the antenna of the second cell base station, or adjusting the elevation angle of the antenna of the second cell base station.

[0093] Step 107, after the second cell base station or the antenna of the second cell base station is rearranged, the test step of the vehicle-to-ground wireless communication system is re-executed.

[0094] In the embodiment of the present application, after the second cell base station or the antenna of the second cell base station is rearranged, steps 101 to 103 are re-executed until it is determined that the switching function is normal. By adjusting the unreasonablely configured base station, the normal operation of the rail vehicle can be guaranteed.

[0095] As a possible implementation, Figure 8 As shown, after executing step 104, the following steps are also included:

[0096] Step 108, obtaining performance parameters of the communication network between the rail vehicle and the second cell base station, the performance parameters including at least one of network delay and bit error rate.

[0097] In an embodiment of the present application, the performance parameters of the communication network between the rail vehicle and the second cell base station can be obtained from the communication monitoring terminal in the rail vehicle, or from the communication monitoring terminal of the second cell base station. Both the communication monitoring terminal in the rail vehicle and the communication monitoring terminal of the second cell base station can select a network tester.

[0098] Step 109, determining whether the performance parameters of the communication network between the rail vehicle and the second cell base station meet preset conditions.

[0099] In the embodiment of the present application, the test terminal determines whether the performance parameters of the communication network between the rail vehicle and the second cell base station meet the preset conditions, specifically, whether the network delay is less than or equal to the preset delay, or whether the bit error rate is less than or equal to the preset bit error rate. It should be noted that the preset delay can be 100ms or 150ms, and the bit error rate can be 0.0005 or 0.001, which is not limited in the present application. If the performance parameters of the communication network between the rail vehicle and the second cell base station meet the preset conditions, step 110 is executed; if the performance parameters of the communication network between the rail vehicle and the second cell base station do not meet the preset conditions, step 111 is executed.

[0100] Step 110, determine whether the communication network between the rail vehicle and the second cell base station is normal.

[0101] In an embodiment of the present application, if the network delay is less than or equal to the preset delay, it is determined that the communication network between the rail vehicle and the second cell base station is normal; or, if the bit error rate is less than or equal to the preset bit error rate, it is determined that the communication network between the rail vehicle and the second cell base station is normal; or, if the network delay is less than the preset delay and the bit error rate is less than or equal to the preset bit error rate, it is determined that the communication network between the rail vehicle and the second cell base station is normal.

[0102] Step 111, determining that the communication network between the rail vehicle and the second cell base station is abnormal.

[0103] In the embodiment of the present application, if the network delay is greater than the preset delay, it is determined that the communication network between the rail vehicle and the second cell base station is abnormal; or if the bit error rate is greater than the preset bit error rate, it is determined that the communication network between the rail vehicle and the second cell base station is abnormal. By determining whether the communication network between the rail vehicle and the second cell base station is abnormal, the safety and reliability of rail vehicle operation is further improved.

[0104] In order to implement the above embodiment, the present application proposes a test terminal, such as Fig.10 As shown, the test terminal 900 includes a memory 920, a processor 910, and a computer program stored in the memory 920 and executable on the processor 910. When the processor 910 executes the computer program, the test method of the vehicle-ground wireless communication system according to the aforementioned embodiment is implemented.

[0105] In order to implement the above embodiments, the present application also proposes a non-transitory computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the test method of the vehicle-ground wireless communication system proposed in the above embodiments is implemented.

[0106] In order to implement the above embodiments, the present application further proposes a computer program product. When the instructions in the computer program product are executed by a processor, the test method of the vehicle-to-ground wireless communication system proposed in the above embodiments is executed.

[0107] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0108] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0109] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0110] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0111] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0112] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0113] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0114] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A test method for a vehicle-ground wireless communication system, applied to a test terminal, characterized in that: include: In an environment without interference from interference sources, obtaining a first position of the rail vehicle when a communication link of the rail vehicle is transferred from a first cell base station to a second cell base station, the first cell base station is arranged in a first cell, the second cell base station is arranged in a second cell, and the first cell and the second cell are adjacent cells; In an environment where there is interference from an interference source, obtaining a second position of the rail vehicle when a communication link of the rail vehicle is transferred from a first cell base station to a second cell base station, wherein the interference source is located between the first cell base station and the second cell base station; determining whether a distance difference between the second position and the first position is greater than a preset distance threshold, and if the distance difference is greater than the preset distance threshold, determining that the switching function is abnormal; If the distance difference is less than or equal to the preset distance threshold, it is determined that the switching function is normal.

2. The method for testing the vehicle-to-ground wireless communication system according to claim 1, characterized in that: The step of obtaining the first position of the rail vehicle when the communication link of the rail vehicle is transferred from the first cell base station to the second cell base station in an environment without interference from interference sources specifically includes: In an environment without interference from interference sources, controlling the rail vehicle to drive from the first cell to the second cell, and obtaining the position of the rail vehicle in real time; When the communication link between the rail vehicle and the second cell base station is connected and the communication link between the rail vehicle and the first cell base station is disconnected, the position of the rail vehicle at this time is marked as the first position.

3. The method for testing the vehicle-to-ground wireless communication system according to claim 2, characterized in that: When the communication link between the rail vehicle and the second cell base station is established and the communication link between the rail vehicle and the first cell base station is disconnected, before marking the position of the rail vehicle at this time as the first position, the method further includes: Acquire the signal strength of the first cell base station and the second cell base station in real time; When the signal strength of the second cell base station is greater than the signal strength of the first cell base station, the rail vehicle is enabled to establish a communication link with the second cell base station, and the rail vehicle is enabled to disconnect the communication link with the first cell base station.

4. The method for testing a vehicle-to-ground wireless communication system according to claim 1, characterized in that: The interference source is a drone carrying a radio jammer. The obtaining of the second position of the rail vehicle when the communication link of the rail vehicle is transferred from the first cell base station to the second cell base station in an environment with interference from the interference source specifically includes: Control the UAV to fly and hover within a target range, where the target range is a sector range covered by the antenna of the second cell base station; Controlling the UAV to send an interference signal, wherein the frequency of the interference signal is consistent with the working frequency of the antenna of the second cell base station, and the power of the interference signal is adjustable; Controlling the rail vehicle to drive from the first cell to the second cell, and acquiring the position of the rail vehicle in real time; When the communication link between the rail vehicle and the second cell base station is connected and the communication link between the rail vehicle and the first cell base station is disconnected, the position of the rail vehicle at this time is marked as the second position.

5. The method for testing the vehicle-ground wireless communication system according to claim 4, characterized in that: When the communication link between the rail vehicle and the second cell base station is established and the communication link between the rail vehicle and the first cell base station is disconnected, before marking the position of the rail vehicle at this time as the second position, the method further includes: Acquire the signal strength of the first cell base station and the second cell base station in real time; When the signal strength of the second cell base station is greater than the signal strength of the first cell base station, the rail vehicle is enabled to establish a communication link with the second cell base station, and the rail vehicle is enabled to disconnect the communication link with the first cell base station.

6. The method for testing the vehicle-ground wireless communication system according to claim 4, characterized in that: The controlling the drone to fly and hover within the target range specifically includes: Acquire the position of the onboard antenna when the rail vehicle runs to the first position; Acquire a position of an antenna of the second cell base station; Determine a target position according to the position of the vehicle-mounted antenna and the position of the antenna of the second cell base station, the target position being within the target range; The drone is controlled to fly and hover to a target location.

7. The method for testing the vehicle-ground wireless communication system according to claim 6, characterized in that: The controlling the UAV to send out a jamming signal specifically includes: Determining a target power of the interference signal according to the target position and the power of a signal sent by an antenna of the second cell base station; The UAV is controlled to emit an interference signal of the target power.

8. The method for testing a vehicle-to-ground wireless communication system according to claim 1, characterized in that: Also includes: When it is determined that the switching function is normal, obtaining performance parameters of the communication network between the rail vehicle and the second cell base station, the performance parameters including at least one of a network delay and a bit error rate; Determine whether the performance parameters of the communication network between the rail vehicle and the second cell base station meet the preset conditions, and if the performance parameters of the communication network between the rail vehicle and the second cell base station meet the preset conditions, determine that the communication network between the rail vehicle and the second cell base station is normal; If the performance parameters of the communication network between the rail vehicle and the second cell base station do not meet the preset conditions, it is determined that the communication network between the rail vehicle and the second cell base station is abnormal.

9. The method for testing a vehicle-to-ground wireless communication system according to claim 1, characterized in that: Also includes: When it is determined that the switching function is abnormal, rearrange the second cell base station or the antenna of the second cell base station; After the second cell base station or the antenna of the second cell base station is rearranged, the test step of the vehicle-to-ground wireless communication system is performed again.

10. A test terminal, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the vehicle-to-ground wireless communication system testing method as claimed in any one of claims 1 to 9 when executing the computer program.

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