A 5G-based coal mine underground communication signal testing method

Abstract

The present invention discloses a 5G-based coal mine underground communication signal testing method, which relates to the field of communication signal testing technology and solves the technical problems of being difficult to select a test project scenario according to a control signal of a cloud server through a roadway trolley, and being difficult to comprehensively perform communication signal testing based on a variety of comprehensive communication data and test project scenarios; initiating control and data processing through a cloud server, and performing data processing function slicing processing, a 5G edge cloud server feeds back the data processing results to a 5G core cloud server, selecting a test project scenario according to a control signal of the cloud server through a roadway trolley, and collecting test environment data in real time, which is quickly fed back to the cloud server through a 5G base station, thereby improving the efficiency of data processing. The roadway trolley can collect test environment data according to the set test project scenario, thereby improving the reliability of the data and facilitating the expansion of more image acquisition equipment and roadway trolleys.

Description

Technical Field

[0001] The present invention belongs to the field of communication signal testing, and specifically is a 5G-based coal mine underground communication signal testing method. Background Art

[0002] In recent years, the continued growth of smart devices in coal mines has led to increasingly prominent issues with data exchange efficiency and line shortages, garnering widespread attention for research and development in the field of underground coal mine IoT. 5G technology offers advantages such as low latency (as low as 1ms), high reliability (up to 99.99%), large capacity, and guaranteed communication quality in complex non-line-of-sight environments. Consequently, a growing number of research institutions and scholars are turning their attention to 5G networking. However, there are currently no methods for testing communication signals in coal mines using 5G networks. Therefore, testing and scientifically evaluating 5G network performance under the context of underground coal mine IoT technology is a crucial prerequisite for accelerating the industrialization of 5G applications in coal mine IoT.

[0003] Most existing underground communication signal testing solutions have a single test item or test scenario. It is difficult to select the test item scenario based on the control signal of the cloud server through the tunnel trolley, and it is also difficult to conduct comprehensive communication signal testing based on a variety of comprehensive communication data and test item scenarios. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art; to this end, the present invention proposes a 5G-based coal mine underground communication signal testing method, which is used to solve the technical problems that it is difficult to select test project scenarios according to the control signal of the cloud server through a tunnel trolley, and it is also difficult to comprehensively conduct communication signal testing based on a variety of comprehensive communication data and test project scenarios.

[0005] To solve the above problems, the first aspect of the present invention provides a 5G-based coal mine underground communication signal testing method, comprising the following steps:

[0006] Deploy 5G base stations, test tunnels, and tunnel trolleys at the test location underground in the coal mine, with the 5G base station located on one side of the test tunnel.

[0007] Data exchange between cloud servers and laneway vehicles is carried out through the 5G core network;

[0008] Control and data processing are initiated through the cloud server, and data processing function slicing is performed. The cloud server includes: a 5G edge cloud server and a 5G core cloud server. The 5G edge cloud server feeds back the data processing results to the 5G core cloud server;

[0009] Relay and forward data between the cloud server and the laneway vehicle through the 5G base station;

[0010] The image acquisition equipment deployed in the test tunnel acquires real-time video image data of the test scene and transmits the data to the cloud server via the 5G base station.

[0011] The aisle car receives control signals from the cloud server and selects the test project scenario according to the control signal, and controls the vehicle to run according to the set program. The aisle car collects test environment data in real time, and feeds back the operation information and test data to the cloud server through the 5G base station.

[0012] As a further solution of the present invention: the 5G core cloud server performs data processing function slicing, including: access and mobility management slices, session management slices, and user plane management slices;

[0013] The access and mobility management slice is responsible for the mobility and access management of terminals;

[0014] The session management slice is responsible for session management;

[0015] The user plane management slice is responsible for user plane function management.

[0016] As a further solution of the present invention: the 5G edge cloud server performs data processing function slicing, including Web slicing, PDN slicing, video surveillance slicing, data storage slicing, and data processing slicing;

[0017] Web slicing is responsible for information setting and query processing of the entire system;

[0018] PDN slicing is responsible for switching services and data distribution across the entire public network;

[0019] Data storage slices store data centrally and use disk arrays for data storage;

[0020] The data processing slice processes and analyzes the operation information and test data of the on-site tunnel trolley, and forwards the data processing results to the 5G core cloud server.

[0021] As a further solution of the present invention: the laneway trolley includes: a local application unit, a communication control unit, a middleware unit and a physical antenna unit;

[0022] The local application unit is used to select the test project scenario according to the test requirements of the test user; the communication control unit is used to control the data transmission between the local application unit and the middleware unit; the middleware unit is used to shield the differences in the physical underlying layer of communication and provide a unified interface for the communication control unit; the physical antenna unit is used for communication with the 5G base station and other aisle vehicles.

[0023] As a further solution of the present invention, the lane trolley receives a control signal from a cloud server and selects a test project scenario according to the control signal, including the following steps:

[0024] Move the laneway trolley loaded with the test equipment into the test lane, initialize the test equipment software, confirm that the network connection is normal, and wait for the test to begin;

[0025] The cloud server sends control signals to the laneway trolley according to the test items, and the laneway trolley completes the test tasks of different test items according to the control signal instructions;

[0026] Among them, the test items include: vehicle-road communication test in 5G underground coal mine environment, vehicle-to-vehicle communication test in 5G underground coal mine environment and application function test in 5G underground coal mine environment.

[0027] As a further solution of the present invention: 5G vehicle-to-road communication testing in an underground coal mine environment includes the following steps:

[0028] The 5G edge cloud server continuously sends 32KB UDP data packets to the lane vehicle for an iperf packet flooding test. The measured data files containing network throughput and packet loss rate are sent to the data storage slice for processing and recording. The test is interrupted after four round trips.

[0029] The 5G edge cloud server sends continuous ping requests to the lane car, continuously sends 32-byte data, and hands the measured delay data to the data processing slice for processing. The results are then sent to the data storage slice for storage and recording. The test is completed after 16 times.

[0030] As a further solution of the present invention: 5G vehicle-to-vehicle communication testing in an underground coal mine environment includes the following steps:

[0031] Use the 5G Internet of Vehicles to establish communication between alley vehicles, configure the iperf server and client, and select vehicle-to-vehicle communication test scenarios. These test scenarios include: alley vehicle following and alley vehicle meeting scenarios.

[0032] Two laneway trolleys, A and B, carrying test equipment, travel at the speed and direction required by the selected vehicle-to-vehicle communication test scenario;

[0033] Among them, the vehicle-to-vehicle communication test scenarios include:

[0034] Laneway vehicle A continuously sends 32KB UDP data packets to Laneway vehicle B for an iperf packet flooding test. The measured throughput and packet loss rate are uploaded to the 5G edge cloud server and handed over to the data processing slice for data processing. The test is interrupted after four round trips.

[0035] Lane Car A makes continuous ping requests to Lane Car B, continuously sending 32-byte data and delivering the measured latency data to the data processing slice for processing. The results are then sent to the data storage slice for storage and recording. The test is completed after 16 times.

[0036] As a further solution of the present invention: 5G application function testing in an underground coal mine environment includes the following steps:

[0037] Two laneway trolleys A and B are equipped with test equipment. Laneway trolley A serves as the pilot vehicle, while laneway trolley B serves as the rear convoy vehicle. They drive according to the application scenario requirements.

[0038] Lane Car A requests navigation from the 5G edge cloud server based on the destination address entered by the test user;

[0039] During driving, laneway car A continuously sends its driving status information and control commands to laneway car B. At the same time, both laneway car A and laneway car B send driving status information to the 5G edge cloud server in real time. After arriving at the destination, the data is delivered to the data processing slice for processing;

[0040] The driving status information includes: position information, speed and acceleration.

[0041] As a further solution of the present invention: data processing slicing processes and analyzes the operation information and test data of the on-site roadway trolley, including the following steps:

[0042] For the test data of the 5G vehicle-to-road communication test in an underground coal mine environment, the average network throughput and packet loss rate data for each round trip during the iperf packet filling test were calculated;

[0043] Obtain historical communication delay data between the 5G edge cloud server and the roadway trolley in a 5G coal mine underground environment when the communication environment is normal. Calculate the mean of the historical communication delay data as the standard value of the underground trolley communication delay. Obtain historical network throughput data between the 5G edge cloud server and the roadway trolley in a 5G coal mine underground environment when the communication environment is normal. Calculate the mean as the standard value of the underground trolley communication network throughput, and the maximum value as the maximum value of the underground trolley communication network throughput.

[0044] The vehicle-road communication quality coefficient is evaluated using the following formula:

[0045]

[0046] Among them, α is the vehicle-road communication quality coefficient, Tps i is the mean network throughput of the i-th return trip, Tpa is the standard value of the underground vehicle communication network throughput, and PLRi is the mean packet loss rate of the i-th round trip, Tpb is the maximum throughput of the underground vehicle communication network, Tps is the mean network throughput of the four round trips, D j is the delay data of the jth test, Da is the standard value of the underground vehicle communication delay, i∈(1,2,3,4), j∈(1,2,…,16);

[0047] For the test data of the 5G vehicle-to-vehicle communication test in the underground coal mine environment, the iperf packet filling test time is divided into several equal detection time intervals, and the average network throughput and packet loss rate data of each detection time interval are detected;

[0048] Obtain historical communication delay data between roadway vehicles in a 5G coal mine underground environment when the communication environment is normal. Calculate the mean of the historical communication delay data as the standard value for communication delay between underground roadway vehicles. Obtain historical network throughput data between underground roadway vehicles in a 5G coal mine underground environment when the communication environment is normal. Calculate the mean as the standard value for underground vehicle communication network throughput, and the maximum value as the maximum value for underground vehicle communication network throughput.

[0049] The vehicle-to-vehicle communication quality coefficient is evaluated using the following formula:

[0050]

[0051] Where β is the vehicle-to-vehicle communication quality coefficient, Tp k is the average network throughput between lane vehicles in the kth detection time interval, Tpc is the standard value of the communication network throughput between lane vehicles, PL k is the mean packet loss rate of the kth detection time interval, Tpd is the maximum communication network throughput between lane cars, Tp is the mean network throughput of the detection time interval corresponding to the jth test delay data, De j is the communication delay data between the laneway trolleys for the jth test, De is the standard value of the communication delay between the laneway trolleys in the mine, k∈(1,2,…,n);

[0052] For the test data of the application function test in the 5G coal mine environment, the difference between the driving status information of the laneway trolley A received by the laneway trolley B and the driving status information sent by the laneway trolley A to the 5G edge cloud server in real time is detected;

[0053] The communication quality coefficient of the application function is evaluated using the following formula:

[0054]

[0055] Wherein, γ is the communication quality coefficient of the application function, La is the distance between the position information of laneway car A received by laneway car B and the position information sent by laneway car A to the 5G edge cloud server in real time, Lall is the total length of the test lane where laneway car A and laneway car B are located, Lb is the distance between the position information sent by laneway car A and laneway car B to the 5G edge cloud server in real time, Va is the difference between the speed information of laneway car A received by laneway car B and the speed information sent by laneway car A to the 5G edge cloud server in real time, V is the speed information sent by laneway car A to the 5G edge cloud server in real time, a is the difference between the acceleration information of laneway car A received by laneway car B and the acceleration information sent by laneway car A to the 5G edge cloud server in real time, and a0 is the acceleration information sent by laneway car A to the 5G edge cloud server in real time;

[0056] The comprehensive communication quality is evaluated based on the vehicle-road communication quality coefficient, the vehicle-road communication quality coefficient and the application function communication quality coefficient.

[0057] As a further solution of the present invention: the comprehensive communication quality is evaluated based on the vehicle-road communication quality coefficient, the vehicle-road communication quality coefficient and the application function communication quality coefficient, using the following formula:

[0058]

[0059] Among them, K is the comprehensive communication quality evaluation value, α is the vehicle-road communication quality coefficient, β is the vehicle-to-vehicle communication quality coefficient, and γ is the application function communication quality coefficient.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] The present invention initiates control and data processing through a cloud server, and performs slicing processing of data processing functions, wherein the cloud server includes: a 5G edge cloud server and a 5G core cloud server. The 5G edge cloud server feeds back the data processing results to the 5G core cloud server. The 5G edge cloud server is located at the edge of the network and can process the data transmitted by the lane trolley nearby, reducing the distance and delay of data transmission to the core network. At the same time, edge computing can also reduce the load on the core network and improve the processing capacity of the entire network. By slicing the data processing function, the data processing process can be more flexibly configured and optimized, and the efficiency and accuracy of data processing can be improved. The deployment of 5G base stations and cloud servers and the slicing processing of data processing functions make the entire system more stable and reliable.

[0062] This invention uses a roadway trolley to select test scenarios based on control signals from a cloud server, collects test environment data in real time, and rapidly feeds it back to the cloud server via a 5G base station, improving data processing efficiency. The roadway trolley can accurately collect test environment data according to a set program, improving data accuracy and reliability. This provides strong support for safe production and scientific management in coal mines, and also facilitates the expansion of more image acquisition equipment and roadway trolleys to accommodate larger-scale coal mine testing scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0064] Figure 1 Schematic diagram of the system framework of the present invention;

[0065] Figure 2 This is a diagram of the laneway trolley data interaction function module of the present invention;

[0066] Figure 3 This is a flow chart of the lane communication performance test of the present invention;

[0067] Figure 4 This is a flow chart of the vehicle-to-vehicle communication performance test of the present invention. DETAILED DESCRIPTION

[0068] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0069] See also Figures 1-4 The first embodiment of the present invention provides a 5G-based coal mine underground communication signal testing method, comprising the following steps:

[0070] Deploy 5G base stations, test tunnels, and tunnel trolleys at the test location underground in the coal mine, with the 5G base station located on one side of the test tunnel.

[0071] Data exchange between cloud servers and laneway vehicles is carried out through the 5G core network;

[0072] Control and data processing are initiated through the cloud server, and data processing function slicing is performed. The cloud server includes: a 5G edge cloud server and a 5G core cloud server. The 5G edge cloud server feeds back the data processing results to the 5G core cloud server;

[0073] Relay and forward data between the cloud server and the laneway vehicle through the 5G base station;

[0074] The image acquisition equipment deployed in the test tunnel acquires real-time video image data of the test scene and transmits the data to the cloud server via the 5G base station.

[0075] The aisle car receives control signals from the cloud server and selects the test project scenario according to the control signal, and controls the vehicle to run according to the set program. The aisle car collects test environment data in real time, and feeds back the operation information and test data to the cloud server through the 5G base station.

[0076] Specifically, such as Figure 1 As shown in the figure, the 5G core network uses NFV and SDN to implement network element functions through software on general servers, and realize data exchange between cloud servers and lane carts; cloud servers are used to start tasks, initiate control and function slicing, and realize slice data processing; 5G base stations are used for relay forwarding to assist the lane carts in communication and positioning with the 5G core network; a test lane is set as a test site, and a camera is installed on the test lane to obtain real-time video images of the test scene; the lane cart is used to receive control and select the test scene according to the control signal to control the vehicle to run according to the set program and feedback the operation information to the cloud server.

[0077] The 5G base station is based on multi-antenna large-scale input and output technology. In this embodiment, the 5G base station is equipped with 16 antennas to form multiple antenna arrays, and the array element spacing of the antenna array is half of the receiving wavelength.

[0078] 5G base stations, test tunnels, and tunnel vehicles are deployed at the underground coal mine test site. The 5G base station is located on one side of the test tunnel. Data exchange between the cloud server and the tunnel vehicle is carried out via the 5G core network. The cloud server initiates control and data processing, and performs data processing function slicing. The cloud server comprises a 5G edge cloud server and a 5G core cloud server, which feeds back data processing results to the 5G core cloud server. 5G technology offers ultra-large bandwidth, enabling rapid transmission of massive amounts of data underground in the coal mine. This ensures efficient data exchange between the tunnel vehicle and the cloud server, reducing data transmission delays and packet loss. The low latency of 5G technology enables the tunnel vehicle to respond to control commands from the cloud server in real time, thereby improving the responsiveness and operational efficiency of the entire system. 5G technology offers enhanced security, ensuring the safety of data transmission. Furthermore, the cloud server utilizes advanced data encryption and storage technologies to ensure data security and integrity. 5G technology and cloud servers enable remote control and automated operation of the tunnel vehicle. This reduces the difficulty and risk of manual operations and improves the safety and efficiency of coal mine production.

[0079] Located at the edge of the network, 5G edge cloud servers can process data transmitted by laneway vehicles locally, reducing the distance and latency required for data transmission to the core network. Edge computing also reduces the load on the core network and improves the overall network processing capacity. By slicing data processing functions, data processing flows can be more flexibly configured and optimized, improving data processing efficiency and accuracy. The deployment of 5G base stations and cloud servers, along with slicing of data processing functions, ensures greater stability and reliability for the entire system.

[0080] Real-time video image data of the test scene is obtained through the image acquisition equipment deployed in the test tunnel, and the data is transmitted to the cloud server through the 5G base station; the tunnel car receives the control signal from the cloud server and selects the test project scene according to the control signal, and controls the vehicle to run according to the set program. The tunnel car collects test environment data in real time, and feeds back the operation information and test data to the cloud server through the 5G base station.

[0081] The real-time video image data obtained by the image acquisition equipment is transmitted to the cloud server at high speed through the 5G base station, ensuring the real-time nature of the data, allowing monitoring and management personnel to quickly obtain underground conditions and respond in a timely manner.

[0082] The roadway trolley selects test scenarios based on control signals from the cloud server and collects test environment data in real time, rapidly feeding it back to the cloud server via a 5G base station, improving data processing efficiency. The roadway trolley accurately collects test environment data according to pre-programmed procedures, enhancing data accuracy and reliability. This provides strong support for safe production and scientific management in coal mines, and facilitates the expansion of additional image acquisition equipment and roadway trolleys to accommodate larger-scale coal mine testing scenarios.

[0083] In one embodiment of the present invention, the 5G core cloud server performs data processing function slicing, including: access and mobility management slices, session management slices, and user plane management slices;

[0084] The access and mobility management slice is responsible for the mobility and access management of terminals;

[0085] The session management slice is responsible for session management;

[0086] The user plane management slice is responsible for user plane function management.

[0087] In one embodiment of the present invention, the 5G edge cloud server performs data processing function slicing, including Web slicing, PDN slicing, video surveillance slicing, data storage slicing, and data processing slicing;

[0088] Web slicing is responsible for information setting and query processing of the entire system;

[0089] PDN slicing is responsible for switching services and data distribution across the entire public network;

[0090] Data storage slices store data centrally and use disk arrays for data storage;

[0091] The data processing slice processes and analyzes the operation information and test data of the on-site tunnel trolley, and forwards the data processing results to the 5G core cloud server.

[0092] In one embodiment of the present invention, the laneway vehicle includes: a local application unit, a communication control unit, a middleware unit, and a physical antenna unit;

[0093] The local application unit is used to select the test project scenario according to the test requirements of the test user; the communication control unit is used to control the data transmission between the local application unit and the middleware unit; the middleware unit is used to shield the differences in the physical underlying layer of communication and provide a unified interface for the communication control unit; the physical antenna unit is used for communication with the 5G base station and other aisle vehicles.

[0094] Specifically, such as Figure 2As shown, the communication control unit includes a communication control module and a data transmission module; the middleware unit includes a 5G RF driver module, a positioning driver module, a 5G RF module and a positioning module; and the physical antenna unit includes a 5G antenna.

[0095] In one embodiment of the present invention, the laneway vehicle receives a control signal from a cloud server and selects a test project scenario according to the control signal, including the following steps:

[0096] Move the laneway trolley loaded with the test equipment into the test lane, initialize the test equipment software, confirm that the network connection is normal, and wait for the test to begin;

[0097] The cloud server sends control signals to the laneway trolley according to the test items, and the laneway trolley completes the test tasks of different test items according to the control signal instructions;

[0098] Among them, the test items include: vehicle-road communication test in 5G underground coal mine environment, vehicle-to-vehicle communication test in 5G underground coal mine environment and application function test in 5G underground coal mine environment.

[0099] In one embodiment of the present invention, Figure 3 As shown in the figure, the 5G vehicle-to-road communication test in an underground coal mine environment includes the following steps:

[0100] The 5G edge cloud server continuously sends 32KB UDP data packets to the lane vehicle for an iperf packet flooding test. The measured data files containing network throughput and packet loss rate are sent to the data storage slice for processing and recording. The test is interrupted after four round trips.

[0101] The 5G edge cloud server sends continuous ping requests to the lane car, continuously sends 32-byte data, and hands the measured delay data to the data processing slice for processing. The results are then sent to the data storage slice for storage and recording. The test is completed after 16 times.

[0102] In one embodiment of the present invention, Figure 4 As shown in the figure, the 5G vehicle-to-vehicle communication test in an underground coal mine environment includes the following steps:

[0103] Use the 5G Internet of Vehicles to establish communication between alley vehicles, configure the iperf server and client, and select vehicle-to-vehicle communication test scenarios. These test scenarios include: alley vehicle following and alley vehicle meeting scenarios.

[0104] Two laneway trolleys, A and B, carrying test equipment, travel at the speed and direction required by the selected vehicle-to-vehicle communication test scenario;

[0105] Among them, the vehicle-to-vehicle communication test scenarios include:

[0106] Laneway vehicle A continuously sends 32KB UDP data packets to Laneway vehicle B for an iperf packet flooding test. The measured throughput and packet loss rate are uploaded to the 5G edge cloud server and handed over to the data processing slice for data processing. The test is interrupted after four round trips.

[0107] Lane Car A makes continuous ping requests to Lane Car B, continuously sending 32-byte data and delivering the measured latency data to the data processing slice for processing. The results are then sent to the data storage slice for storage and recording. The test is completed after 16 times.

[0108] In one embodiment of the present invention, the application function test in a 5G underground coal mine environment includes the following steps:

[0109] Two laneway trolleys A and B are equipped with test equipment. Laneway trolley A serves as the pilot vehicle, while laneway trolley B serves as the rear convoy vehicle. They drive according to the application scenario requirements.

[0110] Lane Car A requests navigation from the 5G edge cloud server based on the destination address entered by the test user;

[0111] During driving, laneway car A continuously sends its driving status information and control commands to laneway car B. At the same time, both laneway car A and laneway car B send driving status information to the 5G edge cloud server in real time. After arriving at the destination, the data is delivered to the data processing slice for processing;

[0112] The driving status information includes: position information, speed and acceleration.

[0113] In one embodiment of the present invention, the data processing slice processes and analyzes the operation information and test data of the on-site roadway trolley, including the following steps:

[0114] For the test data of the 5G vehicle-to-road communication test in an underground coal mine environment, the average network throughput and packet loss rate data for each round trip during the iperf packet filling test were calculated;

[0115] Obtain historical communication delay data between the 5G edge cloud server and the roadway trolley in a 5G coal mine underground environment when the communication environment is normal. Calculate the mean of the historical communication delay data as the standard value of the underground trolley communication delay. Obtain historical network throughput data between the 5G edge cloud server and the roadway trolley in a 5G coal mine underground environment when the communication environment is normal. Calculate the mean as the standard value of the underground trolley communication network throughput, and the maximum value as the maximum value of the underground trolley communication network throughput.

[0116] The vehicle-road communication quality coefficient is evaluated using the following formula:

[0117]

[0118] Among them, α is the vehicle-road communication quality coefficient, Tps i is the mean network throughput of the i-th return trip, Tpa is the standard value of the underground vehicle communication network throughput, and PLR i is the mean packet loss rate of the i-th round trip, Tpb is the maximum throughput of the underground vehicle communication network, Tps is the mean network throughput of the four round trips, D j is the delay data of the jth test, Da is the standard value of the underground vehicle communication delay, i∈(1,2,3,4), j∈(1,2,…,16);

[0119] For the test data of the 5G vehicle-to-vehicle communication test in the underground coal mine environment, the iperf packet filling test time is divided into several equal detection time intervals, and the average network throughput and packet loss rate data of each detection time interval are detected;

[0120] Obtain historical communication delay data between roadway vehicles in a 5G coal mine underground environment when the communication environment is normal. Calculate the mean of the historical communication delay data as the standard value for communication delay between underground roadway vehicles. Obtain historical network throughput data between underground roadway vehicles in a 5G coal mine underground environment when the communication environment is normal. Calculate the mean as the standard value for underground vehicle communication network throughput, and the maximum value as the maximum value for underground vehicle communication network throughput.

[0121] The vehicle-to-vehicle communication quality coefficient is evaluated using the following formula:

[0122]

[0123] Where β is the vehicle-to-vehicle communication quality coefficient, Tp k is the average network throughput between lane vehicles in the kth detection time interval, Tpc is the standard value of the communication network throughput between lane vehicles, PL k is the mean packet loss rate of the kth detection time interval, Tpd is the maximum communication network throughput between lane cars, Tp is the mean network throughput of the detection time interval corresponding to the jth test delay data, De j is the communication delay data between the laneway trolleys for the jth test, De is the standard value of the communication delay between the laneway trolleys in the mine, k∈(1,2,…,n);

[0124] For the test data of the application function test in the 5G coal mine environment, the difference between the driving status information of the laneway trolley A received by the laneway trolley B and the driving status information sent by the laneway trolley A to the 5G edge cloud server in real time is detected;

[0125] The communication quality coefficient of the application function is evaluated using the following formula:

[0126]

[0127] Wherein, γ is the communication quality coefficient of the application function, La is the distance between the position information of laneway car A received by laneway car B and the position information sent by laneway car A to the 5G edge cloud server in real time, Lall is the total length of the test lane where laneway car A and laneway car B are located, Lb is the distance between the position information sent by laneway car A and laneway car B to the 5G edge cloud server in real time, Va is the difference between the speed information of laneway car A received by laneway car B and the speed information sent by laneway car A to the 5G edge cloud server in real time, V is the speed information sent by laneway car A to the 5G edge cloud server in real time, a is the difference between the acceleration information of laneway car A received by laneway car B and the acceleration information sent by laneway car A to the 5G edge cloud server in real time, and a0 is the acceleration information sent by laneway car A to the 5G edge cloud server in real time;

[0128] The comprehensive communication quality is evaluated based on the vehicle-road communication quality coefficient, the vehicle-road communication quality coefficient and the application function communication quality coefficient.

[0129] Specifically, in this embodiment, qualified thresholds are set for the vehicle-road communication quality coefficient, the vehicle-road communication quality coefficient, and the application function communication quality coefficient. When the detected vehicle-road communication quality coefficient, the vehicle-road communication quality coefficient, and the application function communication quality coefficient exceed the preset qualified thresholds, a communication quality alarm is issued. In this embodiment, after a large number of statistics on the specific values ​​of the vehicle-road communication quality coefficient, the vehicle-road communication quality coefficient, and the application function communication quality coefficient when the communication status is completely normal, the qualified thresholds of the vehicle-road communication quality coefficient, the vehicle-road communication quality coefficient, and the application function communication quality coefficient can be set to 0.3, 0.3, and 0.5, respectively.

[0130] In one embodiment of the present invention, the comprehensive communication quality is evaluated based on the vehicle-to-road communication quality coefficient, the vehicle-to-road communication quality coefficient, and the application function communication quality coefficient, using the following formula:

[0131]

[0132] Among them, K is the comprehensive communication quality evaluation value, α is the vehicle-road communication quality coefficient, β is the vehicle-to-vehicle communication quality coefficient, and γ is the application function communication quality coefficient.

[0133] Specifically, in this embodiment, a threshold is set for the comprehensive communication quality evaluation value, and a communication quality alarm is issued when the detected comprehensive communication quality evaluation value exceeds the preset threshold. In this embodiment, after a large number of statistical comprehensive communication quality evaluation values ​​when the communication status is completely normal, the average between the mean and the minimum value is taken as the threshold of the comprehensive communication quality evaluation value.

[0134] The above embodiments are only used to illustrate the technical method of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A 5G-based coal mine underground communication signal testing method, characterized in that: The following steps are involved: Deploy 5G base stations, test tunnels, and tunnel trolleys at the test location underground in the coal mine, with the 5G base station located on one side of the test tunnel. Data exchange between cloud servers and laneway vehicles is carried out through the 5G core network; Control and data processing are initiated through the cloud server, and data processing function slicing is performed. The cloud server includes: a 5G edge cloud server and a 5G core cloud server. The 5G edge cloud server feeds back the data processing results to the 5G core cloud server; Relay and forward data between the cloud server and the laneway vehicle through the 5G base station; The image acquisition equipment deployed in the test tunnel acquires real-time video image data of the test scene and transmits the data to the cloud server via the 5G base station. The laneway trolley receives control signals from the cloud server and selects the test project scenario based on the control signals. It then controls the vehicle to run according to the set program. The laneway trolley collects test environment data in real time and feeds back the operating information and test data to the cloud server via the 5G base station. The data processing slice processes and analyzes the operation information and test data of the on-site roadway trolley, including the following steps: For the test data of the 5G vehicle-to-road communication test in an underground coal mine environment, the average network throughput and packet loss rate data for each round trip during the iperf packet filling test were calculated; Obtain historical communication delay data between the 5G edge cloud server and the roadway trolley in a 5G coal mine underground environment when the communication environment is normal. Calculate the mean of the historical communication delay data as the standard value of the underground trolley communication delay. Obtain historical network throughput data between the 5G edge cloud server and the roadway trolley in a 5G coal mine underground environment when the communication environment is normal. Calculate the mean as the standard value of the underground trolley communication network throughput, and the maximum value as the maximum value of the underground trolley communication network throughput. The vehicle-road communication quality coefficient is evaluated using the following formula: Among them, α is the vehicle-road communication quality coefficient, Tps i is the mean network throughput of the i-th return trip, Tpa is the standard value of the underground vehicle communication network throughput, and PLR i is the mean packet loss rate of the i-th round trip, Tpb is the maximum throughput of the underground vehicle communication network, Tps is the mean network throughput of the four round trips, D j is the delay data of the jth test, Da is the standard value of the underground vehicle communication delay, i∈(1,2,3,4), j∈(1,2,…,16).

2. A 5G-based coal mine underground communication signal testing method according to claim 1, characterized in that: The 5G core cloud server performs data processing function slicing, including access and mobility management slices, session management slices, and user plane management slices. The access and mobility management slice is responsible for the mobility and access management of terminals; The session management slice is responsible for session management; The user plane management slice is responsible for user plane function management.

3. A 5G-based coal mine underground communication signal testing method according to claim 1, characterized in that: 5G edge cloud servers perform data processing function slicing, including Web slicing, PDN slicing, video surveillance slicing, data storage slicing, and data processing slicing; Web slicing is responsible for information setting and query processing of the entire system; PDN slicing is responsible for switching services and data distribution across the entire public network; Data storage slices store data centrally and use disk arrays for data storage; The data processing slice processes and analyzes the operation information and test data of the on-site tunnel trolley, and forwards the data processing results to the 5G core cloud server.

4. A 5G-based coal mine underground communication signal testing method according to claim 1, characterized in that: The laneway trolley includes: a local application unit, a communication control unit, a middleware unit and a physical antenna unit; The local application unit is used to select the test project scenario according to the test requirements of the test user; the communication control unit is used to control the data transmission between the local application unit and the middleware unit; the middleware unit is used to shield the differences in the physical underlying layer of communication and provide a unified interface for the communication control unit; the physical antenna unit is used for communication with the 5G base station and other aisle vehicles.

5. A 5G-based coal mine underground communication signal testing method according to claim 1, characterized in that: The lane trolley receives the control signal from the cloud server and selects the test project scenario according to the control signal, including the following steps: Move the laneway trolley loaded with the test equipment into the test lane, initialize the test equipment software, confirm that the network connection is normal, and wait for the test to begin; The cloud server sends control signals to the laneway trolley according to the test items, and the laneway trolley completes the test tasks of different test items according to the control signal instructions; Among them, the test items include: vehicle-road communication test in 5G underground coal mine environment, vehicle-to-vehicle communication test in 5G underground coal mine environment and application function test in 5G underground coal mine environment.

6. A 5G-based coal mine underground communication signal testing method according to claim 5, characterized in that: The 5G vehicle-to-road communication test in an underground coal mine environment includes the following steps: The 5G edge cloud server continuously sends 32KB UDP data packets to the lane vehicle for an iperf packet flooding test. The measured data files containing network throughput and packet loss rate are sent to the data storage slice for processing and recording. The test is interrupted after four round trips. The 5G edge cloud server sends continuous ping requests to the lane car, continuously sends 32-byte data, and hands the measured delay data to the data processing slice for processing. The results are then sent to the data storage slice for storage and recording. The test is completed after 16 times.

7. A 5G-based coal mine underground communication signal testing method according to claim 5, characterized in that: The 5G vehicle-to-vehicle communication test in an underground coal mine environment includes the following steps: Use the 5G Internet of Vehicles to establish communication between alley vehicles, configure the iperf server and client, and select vehicle-to-vehicle communication test scenarios. These test scenarios include: alley vehicle following and alley vehicle meeting scenarios. Two laneway trolleys, A and B, carrying test equipment, travel at the speed and direction required by the selected vehicle-to-vehicle communication test scenario; Among them, the vehicle-to-vehicle communication test scenarios include: Laneway vehicle A continuously sends 32KB UDP data packets to Laneway vehicle B for an iperf packet flooding test. The measured throughput and packet loss rate are uploaded to the 5G edge cloud server and handed over to the data processing slice for data processing. The test is interrupted after four round trips. Lane Car A makes continuous ping requests to Lane Car B, continuously sending 32-byte data and delivering the measured delay data to the data processing slice for processing, and sending the results to the data storage slice for storage and recording. The test is completed after 16 times.

8. The 5G-based coal mine underground communication signal testing method according to claim 5, characterized in that: The 5G application function test in the underground coal mine environment includes the following steps: Two laneway trolleys A and B are equipped with test equipment. Laneway trolley A serves as the pilot vehicle, while laneway trolley B serves as the rear convoy vehicle. They drive according to the application scenario requirements. Lane Car A requests navigation from the 5G edge cloud server based on the destination address entered by the test user; During driving, laneway car A continuously sends its driving status information and control commands to laneway car B. At the same time, both laneway car A and laneway car B send driving status information to the 5G edge cloud server in real time. After arriving at the destination, the data is delivered to the data processing slice for processing; The driving status information includes: position information, speed and acceleration.

9. A 5G-based coal mine underground communication signal testing method according to claim 1, characterized in that: The data processing slice processes and analyzes the operation information and test data of the on-site roadway trolley, and also includes the following steps: For the test data of the 5G vehicle-to-vehicle communication test in the underground coal mine environment, the iperf packet filling test time is divided into several equal detection time intervals, and the average network throughput and packet loss rate data of each detection time interval are detected; Obtain historical communication delay data between roadway vehicles in a 5G coal mine underground environment when the communication environment is normal. Calculate the mean of the historical communication delay data as the standard value for communication delay between underground roadway vehicles. Obtain historical network throughput data between underground roadway vehicles in a 5G coal mine underground environment when the communication environment is normal. Calculate the mean as the standard value for underground vehicle communication network throughput, and the maximum value as the maximum value for underground vehicle communication network throughput. The vehicle-to-vehicle communication quality coefficient is evaluated using the following formula: Where β is the vehicle-to-vehicle communication quality coefficient, Tp k is the mean value of the network throughput between lane vehicles in the kth detection time interval, Tpc is the standard value of the communication network throughput between lane vehicles, PL k is the mean packet loss rate of the kth detection time interval, Tpd is the maximum communication network throughput between lane cars, Tp is the mean network throughput of the detection time interval corresponding to the jth test delay data, De j is the communication delay data between the laneway trolleys for the jth test, De is the standard value of the communication delay between the laneway trolleys in the mine, k∈(1,2,…,n), and n is the total number of detection time intervals; For the test data of the application function test in the 5G coal mine environment, the difference between the driving status information of the laneway trolley A received by the laneway trolley B and the driving status information sent by the laneway trolley A to the 5G edge cloud server in real time is detected; The communication quality coefficient of the application function is evaluated using the following formula: Wherein, γ is the communication quality coefficient of the application function, La is the distance between the position information of laneway car A received by laneway car B and the position information sent by laneway car A to the 5G edge cloud server in real time, Lall is the total length of the test lane where laneway car A and laneway car B are located, Lb is the distance between the position information sent by laneway car A and laneway car B to the 5G edge cloud server in real time, Va is the difference between the speed information of laneway car A received by laneway car B and the speed information sent by laneway car A to the 5G edge cloud server in real time, V is the speed information sent by laneway car A to the 5G edge cloud server in real time, a is the difference between the acceleration information of laneway car A received by laneway car B and the acceleration information sent by laneway car A to the 5G edge cloud server in real time, and a0 is the acceleration information sent by laneway car A to the 5G edge cloud server in real time; The comprehensive communication quality is evaluated based on the vehicle-road communication quality coefficient, the vehicle-road communication quality coefficient and the application function communication quality coefficient.

10. A 5G-based coal mine underground communication signal testing method according to claim 9, characterized in that: The comprehensive communication quality is evaluated based on the vehicle-to-road communication quality coefficient, the vehicle-to-road communication quality coefficient, and the application function communication quality coefficient using the following formula: Among them, K is the comprehensive communication quality evaluation value, α is the vehicle-road communication quality coefficient, β is the vehicle-to-vehicle communication quality coefficient, and γ is the application function communication quality coefficient.

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