Fault detection and recovery method and system of train-ground communication network

Abstract

The invention relates to the technical field of network maintenance, in particular to a fault detection and recovery method and system for a train-ground communication network, and the method comprises the steps: a network controller obtains a network detection message sent by each wireless access point; the network controller determines the network state of the wireless access point according to the network detection message; and the network controller controls the fault access point with the fault to be offline according to the network state, and adjusts the coverage state of the adjacent access points. In order to solve the problem that a train-ground communication network in the prior art cannot timely remove faults and recover network operation, a diagnosis process based on trackside wireless access points is introduced, a network controller can determine the network state of each wireless access point by collecting and analyzing network detection messages, and the network state of each wireless access point can be determined. And the fault access point is offline in time, so that the wireless network equipment at the vehicle end is prevented from mistakenly accessing the fault access point, and the network coverage of the fault area is realized by adjusting the coverage range of the adjacent access points.

Description

Technical Field

[0001] The present invention relates to the technical field of network maintenance, and in particular to a method and system for fault detection and recovery of a vehicle-to-ground communication network. Background Art

[0002] The vehicle-to-ground communication network is a wireless network mainly based on WLAN technology and configured between the vehicles and the ground station of the rail transit system. It is mainly used to carry PIS (passenger information system) live video streams and CCTV (video surveillance system) video streams. The video data of urban rail business applications is mainly 1080P high-definition video, and is gradually evolving to 2K and 4K video, which has increasing requirements for the bandwidth of the vehicle-to-ground communication network. At the same time, relevant laws and regulations require that on-board CCTV video data be retained for 90 days, and transferring on-board video data to the ground for storage also increases the bandwidth requirements for the vehicle-to-ground communication network. In a common vehicle-to-ground communication network, on-board wireless network equipment is deployed at the front and rear of the vehicle, and an A / B core network isolation and backup architecture is adopted. The on-board terminal equipment accesses the trackside AP (Access Point) corresponding to the A / B network through the on-board MR (Mesh Router) and communicates with the ground server.

[0003] In the prior art, in order to achieve the normal operation of the vehicle-to-ground communication network, it is usually necessary to configure a fault detection system. For example, Chinese patent CN201910244486.6 discloses a fault detection system for a vehicle-to-ground communication system, which includes multiple fault detection devices, a network module, a computing center server, and a rail transit dispatching center server. The fault detection device is used to receive the trackside frequency shift keying signal in the vehicle-to-ground communication system and parse the signal to obtain its first-class parameters. Each fault detection device can transmit the first-class parameters to the computing center server. The computing center server is used to process the first-class parameters and send the processed data set to the rail transit dispatching center server, which displays the data contained in the data set. It helps to more efficiently and centrally process relevant detection data, which not only helps to analyze and troubleshoot the cause of the fault more promptly and quickly in subsequent processing.

[0004] However, in the actual implementation process, the inventors found that such technical solutions usually rely on the installation of additional trackside equipment for detection, and rely on manual operation and maintenance when a fault occurs. This leads to problems such as difficulty in timely access to the line for maintenance and network restoration during the operation of the rail transit system. Summary of the invention

[0005] In view of the above problems existing in the prior art, a method and system for fault detection and recovery of a vehicle-to-ground communication network is now provided.

[0006] The specific technical solutions are as follows:

[0007] A method for fault detection and recovery of a vehicle-to-ground communication network, comprising:

[0008] Step S1: The network controller obtains the network detection message sent by each wireless access point respectively;

[0009] Step S2: the network controller determines the network status of the wireless access point according to the network detection message;

[0010] Step S3: the network controller controls the faulty access point to go offline according to the network status, and adjusts the coverage status of adjacent access points.

[0011] On the other hand, before executing step S1, a local verification process is also included, and the local verification process includes:

[0012] Step S01: the wireless access point collects link information between the wireless access point and the network controller;

[0013] Step S02: the wireless access point identifies a plurality of network devices between the wireless access point and the network controller according to the link information;

[0014] Step S03: the wireless access point determines whether each of the network devices is normal according to the link information to generate a local diagnosis result;

[0015] Step S04: the wireless access point determines whether to go offline according to the local diagnosis result.

[0016] On the other hand, the step S1 comprises:

[0017] Step S11: the wireless access point collects the network status of the adjacent access point to obtain adjacent network coverage information, and collects its own local device information;

[0018] The adjacent network coverage information includes the SSID released by the adjacent access point and the corresponding local signal reception strength;

[0019] The local device information includes the system resource usage rate, local signal transmission strength, environmental noise measurement strength, and traffic load of the wireless access point;

[0020] Step S12: the wireless access point generates the network detection message according to the adjacent network coverage information and the local device information and sends it to the network controller;

[0021] Step S13: When the wireless access point sends the network detection message, the network controller shakes hands with the wireless access point and measures the message delay;

[0022] Step S14: the network controller adds the message delay to the network detection message.

[0023] On the other hand, the step S2 comprises:

[0024] Step S21: the network controller extracts the identification information corresponding to each wireless access point from the network detection message;

[0025] The determination information includes the local device information of the wireless access point, the message delay, and the adjacent network coverage information measured by the adjacent access point;

[0026] Step S22: The network controller determines the network status according to the determination information.

[0027] On the other hand, the step S3 comprises:

[0028] Step S31: the network controller determines the faulty access point and adjacent access points physically adjacent to the faulty access point according to the network status;

[0029] Step S32: the network controller controls the faulty access point to stop releasing the wireless local area network;

[0030] Step S33: the network controller controls the adjacent access point to increase the transmission power according to a preset step size, and uses the faulty access point to measure the received signal power;

[0031] Step S34: Return to step S33 until the received signal power meets expectations.

[0032] A fault detection and recovery system for a vehicle-to-ground communication network, used to implement the above-mentioned fault detection and recovery method, comprising:

[0033] A message collection module, wherein the message collection module obtains network detection messages sent by each wireless access point respectively;

[0034] A state determination module, the state determination module is connected to the message collection module, and the state determination module determines the network state of the wireless access point according to the network detection message;

[0035] A coverage adjustment module is connected to the state determination module. The coverage adjustment module controls the faulty access point to go offline according to the network state, and adjusts the coverage state of the adjacent access point.

[0036] On the other hand, a local verification module is also included, and the local verification module includes:

[0037] A first acquisition module, wherein the first acquisition module collects link information between the wireless access point and the network controller;

[0038] A device identification module, the device identification module is connected to the first acquisition module, and the device identification module identifies a plurality of network devices between the wireless access point and the network controller according to the link information;

[0039] A device diagnosis module, the device diagnosis module is connected to the device identification module, and the device diagnosis module determines whether each of the network devices is normal according to the link information to generate a local diagnosis result;

[0040] A local control module is connected to the device diagnosis module to determine whether to go offline according to the local diagnosis result.

[0041] On the other hand, the message collection module includes:

[0042] A second acquisition module, the second acquisition module acquires the network status of the adjacent access point to obtain adjacent network coverage information, and acquires its own local device information;

[0043] The adjacent network coverage information includes the SSID released by the adjacent access point and the corresponding local signal reception strength;

[0044] The local device information includes the system resource usage rate, local signal transmission strength, environmental noise measurement strength, and traffic load of the wireless access point;

[0045] A message sending module, the message sending module is connected to the second acquisition module, and the message sending module generates the network detection message according to the adjacent network coverage information and the local device information and sends it to the network controller;

[0046] A delay measurement module, wherein the delay measurement module is connected to the message sending module, and when the wireless access point sends the network detection message, the network controller shakes hands with the wireless access point and measures the message delay;

[0047] A delay adding module, wherein the delay adding module is connected to the delay measuring module, and the delay adding module adds the message delay to the network detection message.

[0048] On the other hand, the state determination module includes:

[0049] A discrimination information comparison module, wherein the discrimination information comparison module extracts discrimination information corresponding to each wireless access point from the network detection message;

[0050] The determination information includes the local device information of the wireless access point, the message delay, and the adjacent network coverage information measured by the adjacent access point;

[0051] A discrimination information processing module, wherein the discrimination information processing module is connected to the discrimination information comparison module, and the discrimination information processing module determines the network state according to the discrimination information.

[0052] On the other hand, the coverage adjustment module includes:

[0053] an access point determination module, wherein the access point determination module determines the faulty access point and adjacent access points physically adjacent to the faulty access point according to the network status;

[0054] An offline control module, the offline control module is connected to the access point determination module, and the offline control module controls the faulty access point to stop releasing the wireless local area network;

[0055] An adjustment module is connected to the offline control module, and the adjustment module controls the adjacent access point to increase the transmission power according to a preset step size, and uses the faulty access point to measure the received signal power until the received signal power meets expectations.

[0056] The above technical solution has the following advantages or beneficial effects:

[0057] In view of the problem that the vehicle-to-ground communication network in the prior art cannot eliminate faults and restore network operation in a timely manner, this solution introduces a diagnostic process based on wireless access points on the trackside. The network controller collects and analyzes network detection messages to determine the network status of each wireless access point, and promptly takes the faulty access point offline to prevent the wireless network equipment on the vehicle side from mistakenly accessing the faulty access point. In addition, network coverage of the faulty area is achieved by adjusting the coverage range of adjacent access points. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The embodiments of the present invention will be described more fully with reference to the attached drawings, which are provided for illustration and description only and are not intended to limit the scope of the present invention.

[0059] Figure 1 It is an overall schematic diagram of an embodiment of the present invention;

[0060] Figure 2 This is a schematic diagram of step S01 in an embodiment of the present invention;

[0061] Figure 3 This is a schematic diagram of step S1 in an embodiment of the present invention;

[0062] Figure 4 This is a schematic diagram of step S2 in an embodiment of the present invention;

[0063] Figure 5 This is a schematic diagram of step S3 in an embodiment of the present invention;

[0064] Figure 6 A schematic diagram of a system in an embodiment of the present invention;

[0065] Figure 7 This is a schematic diagram of a local verification module in an embodiment of the present invention;

[0066] Figure 8 This is a schematic diagram of a message collection module in an embodiment of the present invention;

[0067] Fig. 9 This is a schematic diagram of a state determination module in an embodiment of the present invention;

[0068] Fig.10 Schematic diagram of a coverage adjustment module in an embodiment of the present invention. DETAILED DESCRIPTION

[0069] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0070] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0071] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0072] The present invention comprises:

[0073] A fault detection and recovery method for a vehicle-to-ground communication network, such as Figure 1 As shown, including:

[0074] Step S1: The network controller obtains the network detection message sent by each wireless access point respectively;

[0075] Step S2: The network controller determines the network status of the wireless access point according to the network detection message;

[0076] Step S3: the network controller controls the faulty access point to go offline according to the network status, and adjusts the coverage status of the adjacent access points.

[0077] Specifically, in response to the problem in the prior art that the vehicle-to-ground communication network cannot eliminate faults and restore network operation in a timely manner, in this embodiment, a diagnostic process based on wireless access points on the trackside is introduced. The network controller collects and analyzes network detection messages to determine the network status of each wireless access point, and promptly takes the faulty access point offline to prevent the wireless network equipment on the vehicle side from mistakenly accessing the faulty access point, and achieves network coverage of the faulty area by adjusting the coverage range of adjacent access points.

[0078] During implementation, the above fault detection and recovery method is configured as a software embodiment in a vehicle-to-ground communication network. The vehicle-to-ground communication network includes a core network A and a core network B that are isolated from each other and serve as backup for each other.

[0079] Taking one of the core networks A as an example, core network A includes an on-board MESH router installed at the front or rear of the train and multiple wireless access points laid along the track. The wireless access points are connected to the backbone ring network through a centralized station. The centralized station is equivalent to a switch device, which is used to uniformly connect multiple wireless access points to the upper backbone ring network. A core switch is also configured on the backbone ring network, which is connected to other devices on the ground side, including the upper gateway, video storage server, and network controller. The network controller is used to manage multiple wireless access points in the core network.

[0080] Core network B has the same network architecture, the only difference is that the on-board MESH routing is set at the rear or front position of the vehicle, which is different from core network A. The impact of local weak network areas is avoided by extending the equipment interval.

[0081] In one embodiment, before executing step S1, a local verification process is also included, such as Figure 2 As shown in the figure, the local verification process includes:

[0082] Step S01: The wireless access point collects link information between the wireless access point and the network controller;

[0083] Step S02: the wireless access point identifies multiple network devices between the wireless access point and the network controller according to the link information;

[0084] Step S03: The wireless access point determines whether each network device is normal according to the link information to generate a local diagnosis result;

[0085] Step S04: The wireless access point determines whether it is offline according to the local diagnosis result.

[0086] Specifically, in order to achieve a better wireless access effect, in this embodiment, a local verification process is also configured on the wireless access point side. Specifically, a heartbeat mechanism is agreed upon between the wireless access point and the network controller for timed handshake. When the timer is triggered, a handshake is performed between the wireless access point and the network controller, so that the wireless access point collects link information on the communication link, including the network devices passed through, the status and delay of each network device.

[0087] Subsequently, the wireless access point identifies multiple network devices between the wireless access point and the network controller based on the link information, and calculates the forwarding delay through each network device respectively, and determines whether each network device is normal in combination with other information in the link information to generate a local diagnosis result. When the local diagnosis result indicates that there is a problem with the current communication link, the wireless access point goes offline and stops releasing the SSID to avoid vehicle access. Accordingly, after the wireless access point goes offline, the network controller cannot receive the network detection message of the wireless access point, and it will determine it as a faulty access point and control the adjacent access points for coverage.

[0088] In one embodiment, Figure 3 As shown, step S1 includes:

[0089] Step S11: The wireless access point collects network status of adjacent access points to obtain adjacent network coverage information, and collects its own local device information;

[0090] Neighboring network coverage information includes the SSID released by the neighboring access point and the corresponding local signal reception strength;

[0091] Local device information includes the system resource usage of the wireless access point, local signal transmission strength, environmental noise measurement strength, and traffic load;

[0092] Step S12: The wireless access point generates a network detection message according to the adjacent network coverage information and the local device information and sends it to the network controller;

[0093] Step S13: When the wireless access point sends a network detection message, the network controller shakes hands with the wireless access point and measures the message delay;

[0094] Step S14: the network controller adds the message delay to the network detection message.

[0095] Specifically, in order to achieve a better fault diagnosis effect, in this embodiment, a regular diagnosis mechanism is pre-agreed between the wireless access point and the network controller. When the diagnosis cycle is reached, the network status of the adjacent access point is collected to obtain the adjacent network coverage information, and the local device information of the wireless access point is collected. Among them, the network status of the adjacent access point mainly collects the SSID released by the adjacent access point and the local signal reception strength measured by the local wireless access point. Since the coverage range and switching position between different wireless access points have been pre-configured during network installation, when the adjacent access point fails, the problem of being unable to measure the SSID released by it or the signal strength is too weak will occur. The wireless access point also diagnoses its own device information, the system resource utilization rate of the wireless access point, the local signal transmission strength, the environmental noise measurement strength, and the traffic load. Subsequently, the wireless access point generates a network detection message based on the adjacent network coverage information and the local device information and sends it to the network controller. According to the transmission mechanism of the TCP / UDP protocol, in the process of the wireless access point sending the network detection message, the network controller will perform a three-way handshake with the wireless access point, and measure the message delay by adding a specific message field during the handshake process. The network controller adds the message delay as part of the network detection message to the corresponding field for subsequent analysis.

[0096] In one embodiment, Figure 4 As shown, step S2 includes:

[0097] Step S21: the network controller extracts the identification information corresponding to each wireless access point from the network detection message;

[0098] The identification information includes local device information of the wireless access point, message delay, and adjacent network coverage information measured by adjacent access points;

[0099] Step S22: The network controller determines the network status according to the determination information.

[0100] Specifically, in order to achieve a better diagnostic effect, in this embodiment, the network controller extracts the discrimination information corresponding to each wireless access point from the network detection message. Specifically, for each wireless access point, the network controller treats it as a row in the database table, and then first fills in the local device information and message delay in the field. Then, using the identifier of the wireless access point as the search condition, the adjacent network coverage information is searched, and the network measurement information associated with the wireless access point is obtained and filled in. Then, the network controller determines the network status according to the discrimination information.

[0101] In one embodiment, Figure 5 As shown, step S3 includes:

[0102] Step S31: the network controller determines the faulty access point and adjacent access points physically adjacent to the faulty access point according to the network status;

[0103] Step S32: the network controller controls the faulty access point to stop releasing the wireless LAN;

[0104] Step S33: the network controller controls the adjacent access points to increase the transmission power according to the preset step length, and uses the faulty access point to measure the received signal power;

[0105] Step S34: Return to step S33 until the received signal power meets expectations.

[0106] Specifically, in order to effectively eliminate the network fault, in this embodiment, the network controller first determines the faulty access point and the adjacent access points physically adjacent to the faulty access point according to the network status. Then, the network controller controls the faulty access point to stop releasing the wireless LAN. Then, the adjacent access points are controlled to increase the transmission power according to the preset step size, and the received signal power is measured using the faulty access point until the received signal power meets expectations. The above method is used to effectively eliminate the fault at the fault point.

[0107] A fault detection and recovery system for a vehicle-to-ground communication network is used to implement the above-mentioned fault detection and recovery method, such as Figure 6 As shown, including:

[0108] Message collection module 1, message collection module 1 respectively obtains the network detection message sent by each wireless access point;

[0109] A state determination module 2, the state determination module 2 is connected to the message collection module 1, and the state determination module 2 determines the network state of the wireless access point according to the network detection message;

[0110] The coverage adjustment module 3 is connected to the state determination module 2. The coverage adjustment module 3 controls the faulty access point to go offline according to the network state, and adjusts the coverage state of the adjacent access point.

[0111] Specifically, in view of the problem that the vehicle-to-ground communication network in the prior art cannot eliminate faults and restore network operation in a timely manner, in this embodiment, a diagnostic process based on wireless access points on the trackside is introduced. The message collection module 1 collects network detection messages and analyzes them by the status determination module 2, so as to determine the network status of each wireless access point. The coverage adjustment module 3 takes the faulty access point offline in time to prevent the wireless network equipment on the vehicle side from mistakenly accessing the faulty access point, and the network coverage of the faulty area is achieved by adjusting the coverage range of adjacent access points.

[0112] In one embodiment, Figure 7As shown, a local verification module 4 is also included, and the local verification module 4 includes:

[0113] A first collection module 41, the first collection module 41 collects link information between the wireless access point and the network controller;

[0114] A device identification module 42, the device identification module 42 is connected to the first acquisition module 41, and the device identification module 42 identifies multiple network devices between the wireless access point and the network controller according to the link information;

[0115] A device diagnosis module 43, the device diagnosis module 43 is connected to the device identification module 42, and the device diagnosis module 43 determines whether each network device is normal according to the link information to generate a local diagnosis result;

[0116] The local control module 44 is connected to the device diagnosis module 43 to determine whether to go offline according to the local diagnosis result.

[0117] Specifically, in order to achieve a better wireless access effect, in this embodiment, a local verification process is also configured on the wireless access point side. Specifically, a heartbeat mechanism is agreed upon between the wireless access point and the network controller for timed handshake. When the timer is triggered, the first acquisition module 41 and the network controller perform a handshake, so that the wireless access point collects link information on the communication link, including the network devices passed through, the status and delay of each network device.

[0118] Subsequently, the device identification module 42 identifies multiple network devices between the wireless access point and the network controller according to the link information, and calculates the forwarding delay through each network device respectively. The device diagnosis module 43 determines whether each network device is normal in combination with other information in the link information to generate a local diagnosis result. When the local diagnosis result indicates that there is a problem with the current communication link, the local control module 44 controls the wireless access point to go offline and stops releasing the SSID to avoid vehicle access. Accordingly, after the wireless access point goes offline, the network controller cannot receive the network detection message of the wireless access point, and it will determine it as a faulty access point and control the adjacent access point to cover it.

[0119] In one embodiment, Figure 8 As shown, the message collection module 1 includes:

[0120] A second acquisition module 11, the second acquisition module 11 acquires the network status of adjacent access points to obtain adjacent network coverage information, and acquires its own local device information;

[0121] Neighboring network coverage information includes the SSID released by the neighboring access point and the corresponding local signal reception strength;

[0122] Local device information includes the system resource usage of the wireless access point, local signal transmission strength, environmental noise measurement strength, and traffic load;

[0123] A message sending module 12, the message sending module 12 is connected to the second acquisition module 11, and the message sending module 12 generates a network detection message according to the adjacent network coverage information and the local device information and sends it to the network controller;

[0124] The delay measurement module 13 is connected to the message sending module 12. When the wireless access point sends a network detection message, the network controller shakes hands with the wireless access point and measures the message delay.

[0125] The delay adding module 14 is connected to the delay measuring module 13 , and the delay adding module 14 adds the message delay to the network detection message.

[0126] Specifically, in order to achieve a better fault diagnosis effect, in this embodiment, a regular diagnosis mechanism is pre-agreed between the wireless access point and the network controller. When the diagnosis cycle is reached, the second acquisition module 11 collects the network status of the adjacent access point to obtain the adjacent network coverage information, and collects its own local device information. Subsequently, the message sending module 12 generates a network detection message according to the adjacent network coverage information and the local device information and sends it to the network controller. According to the transmission mechanism of the TCP / UDP protocol, in the process of the wireless access point sending the network detection message, the network controller will perform a three-way handshake with the wireless access point. During the handshake process, the delay measurement module 13 measures the message delay by adding a specific message field. The delay adding module 14 adds the message delay as part of the network detection message to the corresponding field for subsequent analysis.

[0127] In one embodiment, Fig. 9 As shown, the state determination module 2 includes:

[0128] A discrimination information comparison module 21, wherein the discrimination information comparison module 21 extracts discrimination information corresponding to each wireless access point from the network detection message;

[0129] The identification information includes local device information of the wireless access point, message delay, and adjacent network coverage information measured by adjacent access points;

[0130] The judgment information processing module 22 is connected to the judgment information comparison module 21, and the judgment information processing module determines the network status according to the judgment information.

[0131] Specifically, in order to achieve a better diagnostic effect, in this embodiment, the network controller extracts the discrimination information corresponding to each wireless access point from the network detection message. Specifically, for each wireless access point, the discrimination information comparison module 21 takes it as a row of the database table, and then first fills in the local device information and the message delay in the field. Then, with the identifier of the wireless access point as the search condition, the adjacent network coverage information is searched, and the network measurement information associated with the wireless access point is obtained and filled in. Then, the discrimination information processing module 22 determines the network status according to the discrimination information.

[0132] In one embodiment, Fig.10 As shown, the coverage adjustment module 3 includes:

[0133] An access point determination module 31, the access point determination module 31 determines the faulty access point and adjacent access points physically adjacent to the faulty access point according to the network status;

[0134] An offline control module 32, the offline control module 32 is connected to the access point determination module 31, and the offline control module 32 controls the faulty access point to stop releasing the wireless local area network;

[0135] The adjustment module 33 is connected to the offline control module 32. The adjustment module 33 controls the adjacent access points to increase the transmission power according to the preset step length, and uses the faulty access point to measure the received signal power until the received signal power meets expectations.

[0136] Specifically, in order to effectively eliminate network faults, in this embodiment, the access point determination module 31 first determines the faulty access point and the adjacent access points physically adjacent to the faulty access point according to the network status. Subsequently, the offline control module 32 controls the faulty access point to stop releasing the wireless LAN. The adjustment module 33 then controls the adjacent access points to increase the transmission power according to the preset step size, and uses the faulty access point to measure the received signal power until the received signal power meets expectations. The above method is used to effectively eliminate the fault at the fault point.

[0137] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for fault detection and recovery of a vehicle-to-ground communication network, characterized in that: include: Step S1: The network controller obtains the network detection message sent by each wireless access point respectively; Step S2: the network controller determines the network status of the wireless access point according to the network detection message; Step S3: the network controller controls the faulty access point to go offline according to the network status, and adjusts the coverage status of adjacent access points.

2. The fault detection and recovery method according to claim 1, characterized in that: Before executing step S1, a local verification process is also included, and the local verification process includes: Step S01: the wireless access point collects link information between the wireless access point and the network controller; Step S02: the wireless access point identifies a plurality of network devices between the wireless access point and the network controller according to the link information; Step S03: the wireless access point determines whether each of the network devices is normal according to the link information to generate a local diagnosis result; Step S04: the wireless access point determines whether to go offline according to the local diagnosis result.

3. The fault detection and recovery method according to claim 1, characterized in that: The step S1 comprises: Step S11: the wireless access point collects the network status of the adjacent access point to obtain adjacent network coverage information, and collects its own local device information; The adjacent network coverage information includes the SSID released by the adjacent access point and the corresponding local signal reception strength; The local device information includes the system resource usage rate, local signal transmission strength, environmental noise measurement strength, and traffic load of the wireless access point; Step S12: the wireless access point generates the network detection message according to the adjacent network coverage information and the local device information and sends it to the network controller; Step S13: When the wireless access point sends the network detection message, the network controller shakes hands with the wireless access point and measures the message delay; Step S14: the network controller adds the message delay to the network detection message.

4. The fault detection and recovery method according to claim 3, characterized in that: The step S2 comprises: Step S21: the network controller extracts the identification information corresponding to each wireless access point from the network detection message; The determination information includes the local device information of the wireless access point, the message delay, and the adjacent network coverage information measured by the adjacent access point; Step S22: The network controller determines the network status according to the determination information.

5. The fault detection and recovery method according to claim 1, characterized in that: The step S3 comprises: Step S31: the network controller determines the faulty access point and adjacent access points physically adjacent to the faulty access point according to the network status; Step S32: the network controller controls the faulty access point to stop releasing the wireless local area network; Step S33: the network controller controls the adjacent access point to increase the transmission power according to a preset step size, and uses the faulty access point to measure the received signal power; Step S34: Return to step S33 until the received signal power meets expectations.

6. A fault detection and recovery system for a vehicle-to-ground communication network, characterized in that: The method for implementing the fault detection and recovery method according to any one of claims 1 to 5 comprises: A message collection module, wherein the message collection module obtains network detection messages sent by each wireless access point respectively; A state determination module, the state determination module is connected to the message collection module, and the state determination module determines the network state of the wireless access point according to the network detection message; A coverage adjustment module is connected to the state determination module. The coverage adjustment module controls the faulty access point to go offline according to the network state, and adjusts the coverage state of the adjacent access point.

7. The fault detection and recovery system according to claim 6, characterized in that: It also includes a local verification module, which includes: A first acquisition module, wherein the first acquisition module collects link information between the wireless access point and the network controller; A device identification module, the device identification module is connected to the first acquisition module, and the device identification module identifies a plurality of network devices between the wireless access point and the network controller according to the link information; A device diagnosis module, the device diagnosis module is connected to the device identification module, and the device diagnosis module determines whether each of the network devices is normal according to the link information to generate a local diagnosis result; A local control module is connected to the device diagnosis module to determine whether to go offline according to the local diagnosis result.

8. The fault detection and recovery system according to claim 6, characterized in that: The message collection module comprises: A second acquisition module, the second acquisition module acquires the network status of the adjacent access point to obtain adjacent network coverage information, and acquires its own local device information; The adjacent network coverage information includes the SSID released by the adjacent access point and the corresponding local signal reception strength; The local device information includes the system resource usage rate, local signal transmission strength, environmental noise measurement strength, and traffic load of the wireless access point; A message sending module, the message sending module is connected to the second acquisition module, and the message sending module generates the network detection message according to the adjacent network coverage information and the local device information and sends it to the network controller; A delay measurement module, wherein the delay measurement module is connected to the message sending module, and when the wireless access point sends the network detection message, the network controller shakes hands with the wireless access point and measures the message delay; A delay adding module, wherein the delay adding module is connected to the delay measuring module, and the delay adding module adds the message delay to the network detection message.

9. The fault detection and recovery system according to claim 8, characterized in that: The state determination module comprises: A discrimination information comparison module, wherein the discrimination information comparison module extracts discrimination information corresponding to each wireless access point from the network detection message; The determination information includes the local device information of the wireless access point, the message delay, and the adjacent network coverage information measured by the adjacent access point; A discrimination information processing module, wherein the discrimination information processing module is connected to the discrimination information comparison module, and the discrimination information processing module determines the network state according to the discrimination information.

10. The fault detection and recovery system according to claim 6, characterized in that: The coverage adjustment module comprises: an access point determination module, wherein the access point determination module determines the faulty access point and adjacent access points physically adjacent to the faulty access point according to the network status; An offline control module, the offline control module is connected to the access point determination module, and the offline control module controls the faulty access point to stop releasing the wireless local area network; An adjustment module is connected to the offline control module, and the adjustment module controls the adjacent access point to increase the transmission power according to a preset step size, and uses the faulty access point to measure the received signal power until the received signal power meets expectations.

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