CN113993158A - Network quality monitoring method, system, computer equipment and storage medium - Google Patents

Network quality monitoring method, system, computer equipment and storage medium Download PDF

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Publication number
CN113993158A
CN113993158A CN202111260079.8A CN202111260079A CN113993158A CN 113993158 A CN113993158 A CN 113993158A CN 202111260079 A CN202111260079 A CN 202111260079A CN 113993158 A CN113993158 A CN 113993158A
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network quality
equipment
sub
packet loss
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CN113993158B (en
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戴麒麟
蔡信浩
欧阳平
周建文
闵建春
汪海军
杨浩炜
朱亚洲
方定伟
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Chengdu Changhong Network Technology Co ltd
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Chengdu Changhong Network Technology Co ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/08Testing, supervising or monitoring using real traffic
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/18Self-organising networks, e.g. ad-hoc networks or sensor networks
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a method, a system and a device for monitoring network quality, wherein the monitoring method comprises the following steps: the method comprises the steps that a main AP device obtains a current network topological structure; the method comprises the steps that a main AP device executes ping operation to a server to obtain first network quality between the main AP device and the server; each sub-AP device executes ping operation to the main AP device, acquires second network quality between each sub-AP device and the main AP device, and transmits the second network quality to the main AP device; and the main AP equipment loads the first network quality and all the second network qualities into the current network topology structure to obtain the current network communication quality. The network quality monitoring method provided by the invention can be used for detecting the network quality of each AP equipment point, so that a user can conveniently maintain the equipment according to the network quality of the AP point, and the user requirements are met.

Description

Network quality monitoring method, system, computer equipment and storage medium
Technical Field
The present invention relates to the field of wireless network monitoring technologies, and in particular, to a method, a system, and a device for monitoring network quality.
Background
With the increasing popularization of home wireless networks, the equipment application of multi-AP (wireless access point) distributed networking is more and more extensive in the network use scene of a large area or a business area with large pedestrian volume and the like, the networking adopts a wireless MESH distributed network mode, the defect that the traditional network cable arrangement mode expands the network can be avoided, a sub machine can be networked with a main machine by plugging in electricity, the network cable arrangement is not required to be considered, the convenience and the rapidness are realized, and the network coverage range is improved.
In order to improve the network quality of devices at different positions in the distributed network, a user can visually check the network condition of each current AP, and it becomes more important to monitor the network quality of each AP point.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a network quality monitoring method, a system and a device, which are used for monitoring the quality of each network.
In a first aspect, the present invention provides a network quality monitoring method applied to a network quality monitoring system, where the network quality monitoring system includes a master AP device, multiple sub-AP devices, and a server, the master AP device and the multiple sub-AP devices are networked in an MESH manner, and the master AP device is connected to the server, and the monitoring method includes: the master AP equipment acquires a current network topology structure; the main AP equipment executes ping operation to the server to acquire first network quality between the main AP equipment and the server; each sub-AP device executes ping operation to the main AP device, acquires second network quality between each sub-AP device and the main AP device, and transmits the second network quality to the main AP device; and the main AP equipment loads the first network quality and all the second network qualities into the current network topology structure to obtain the current network communication quality.
Optionally, the acquiring, by the master AP device, a current network topology includes: the main AP equipment respectively monitors the RSSI and the sending rate of the sub-AP equipment associated with the main AP equipment to obtain a first monitoring result; each sub-AP device monitors the RSSI and the sending rate of the sub-AP device associated with the sub-AP device respectively to obtain a second monitoring result, and transmits the second monitoring result to the main AP device; and the master AP equipment generates the current network topology structure according to the first monitoring result and the second monitoring result.
Optionally, the ping operation performed by the master AP device to the server by the master AP device to obtain a first network quality between the master AP device and the server includes: the main AP equipment executes ping operation in each time period to obtain average delay and packet loss rate in each time period; the main AP equipment obtains first network quality between the main AP equipment and the server according to the average delay and the packet loss rate; the time period is a first time length, the time for executing one ping operation is a second time length, and the first time length is greater than the second time length.
Optionally, the obtaining, by the master AP device, the first network quality between the master AP device and the server according to the average delay and the packet loss rate includes: if the packet loss rate is greater than or equal to a first packet loss rate threshold value, judging that the first network quality is disconnected; if the packet loss rate is greater than a second packet loss rate threshold or the average delay is greater than a first delay threshold, determining that the first network quality is poor; if the packet loss rate is greater than a third packet loss rate threshold or the average delay is greater than a second delay threshold, determining that the first network quality is general; otherwise, judging that the first network quality is good.
Optionally, the step of the each sub-AP device performing ping operation to the main AP device to obtain a second network quality between the each sub-AP device and the main AP device includes: the sub AP equipment executes ping operation in each time period to obtain average time delay and packet loss rate in each time period; the sub-AP equipment obtains second network quality between the sub-AP equipment and the main AP equipment according to the average delay and the packet loss rate; the time period is a third time length, the time for executing one ping operation is a fourth time length, and the third time length is longer than the fourth time length.
Optionally, the obtaining, by the sub-AP device, a second network quality between the sub-AP device and the main AP device according to the average delay and the packet loss ratio includes: if the packet loss rate is greater than or equal to a fourth packet loss rate threshold, determining that the second network quality is disconnected; if the packet loss rate is greater than a fifth packet loss rate threshold or the average delay is greater than a third delay threshold, determining that the second network quality is poor; if the packet loss rate is greater than a sixth packet loss rate threshold or the average delay is greater than a fourth delay threshold, determining that the second network quality is general; otherwise, judging that the second network quality is good.
Optionally, the master AP device transmits the current network communication quality to the server.
In a second aspect, the present invention provides a network quality monitoring system, comprising: the monitoring system includes: the system comprises a main AP device, a plurality of sub-AP devices and a server; the main AP equipment and the plurality of sub-AP equipment are networked in an MESH mode, and the main AP equipment is connected with the server; the main AP equipment is used for executing ping operation to the server and acquiring first network quality between the main AP equipment and the server; the multiple sub-AP devices are used for respectively executing ping operation to the main AP device, acquiring second network quality between each sub-AP device and the main AP device, and transmitting the second network quality to the main AP device; the main AP equipment is further used for loading the first network quality and all the second network qualities into the current network topology structure to obtain the current network communication quality.
In a third aspect, the present invention provides a computer device, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program: the master AP equipment acquires a current network topology structure; the main AP equipment executes ping operation to the server to acquire first network quality between the main AP equipment and the server; each sub-AP device executes ping operation to the main AP device, acquires second network quality between each sub-AP device and the main AP device, and transmits the second network quality to the main AP device; and the main AP equipment loads the first network quality and all the second network qualities into the current network topology structure to obtain the current network communication quality.
In a fourth aspect, the present invention provides a readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of: the master AP equipment acquires a current network topology structure; the main AP equipment executes ping operation to the server to acquire first network quality between the main AP equipment and the server; each sub-AP device executes ping operation to the main AP device, acquires second network quality between each sub-AP device and the main AP device, and transmits the second network quality to the main AP device; and the main AP equipment loads the first network quality and all the second network qualities into the current network topology structure to obtain the current network communication quality.
The invention has the following beneficial effects:
the main AP equipment executes ping operation to the server to obtain the network quality between the server and the main AP equipment, each sub-AP equipment executes ping operation to the main AP equipment respectively to obtain the network quality between each sub-AP equipment and the main AP equipment, so that all the network quality is obtained, a user can check all the network quality, and the maintenance is carried out aiming at the AP equipment with poor network quality.
Drawings
Fig. 1 is a structural diagram of a network quality monitoring system according to an embodiment of the present invention;
fig. 2 is a flowchart of a network quality monitoring method according to an embodiment of the present invention;
fig. 3 is a flowchart of a network quality monitoring method according to another embodiment of the present invention;
fig. 4 is a flowchart of a network quality monitoring method according to another embodiment of the present invention;
fig. 5 is a flowchart of a network quality monitoring method according to another embodiment of the present invention;
fig. 6 is a flowchart of a network quality monitoring method according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
Fig. 1 is a structural diagram of a network quality monitoring system according to an embodiment of the present invention, and as shown in fig. 1, the network quality monitoring system includes a main AP device, a plurality of sub-AP devices, and a server, where the main AP device and the plurality of sub-AP devices are networked in a MESH manner, and it should be noted that the number of the sub-AP devices in the diagram is set according to actual needs, and includes but is not limited to the number shown in the diagram. The main AP equipment and all the sub-AP equipment are set to be the same SSID, encryption mode and secret key, the wireless terminal is connected to the networking through the same SSID and is accessed to the networking through the same encryption mode and secret key, and the SSID is the name of a wireless signal sent by the AP equipment.
Fig. 2 is a flowchart of a network quality monitoring method according to an embodiment of the present invention, and as shown in fig. 2, the monitoring method specifically includes the following steps:
step S101: the master AP equipment acquires a current network topology structure.
In step S101, the master AP device obtains the current network topology, so that the connection relationship between the current master AP device and the sub-AP device can be clearly known, and a user can clearly and visually check the connection relationship.
Step S102: the master AP device executes ping operation to the server to acquire first network quality between the master AP device and the server.
The ping operation is a service instruction working in an application layer of a TCP/IP network system structure, the main AP device accesses the internet through the server, and the ping operation is executed to the server through the main AP device, so that the first network quality between the main AP device and the server can be obtained.
Step S103: each sub-AP device executes ping operation to the main AP device, acquires second network quality between each sub-AP device and the main AP device, and transmits the second network quality to the main AP device.
Step S104: and the main AP equipment loads the first network quality and all the second network qualities into the current network topology structure to obtain the current network communication quality.
Through the steps S101 to S104, the first network quality between the main AP device and the server and the second network quality between all the sub-AP devices and the main AP device are displayed in the form of a network topology structure, so that a user can view the network quality of each AP device point in the network topology structure, visually display the AP devices with abnormal network quality, and conveniently debug the abnormal AP devices.
Example two
Fig. 3 is a flowchart of a network quality monitoring method according to another embodiment of the present invention, and as shown in fig. 3, the acquiring, by the master AP device, a current network topology specifically includes the following steps:
step S201: and the main AP equipment respectively monitors the RSSI and the sending rate of the sub-AP equipment associated with the main AP equipment to obtain a first monitoring result.
Step S202: and each sub-AP device monitors the RSSI and the sending rate of the sub-AP device associated with the sub-AP device respectively to obtain a second monitoring result, and transmits the second monitoring result to the main AP device.
Step S203: and the master AP equipment generates the current network topology structure according to the first monitoring result and the second monitoring result.
Wherein, the RSSI represents the strength of the signal received by the AP device. The RSSI and the transmission rate of the AP equipment associated with the AP equipment are monitored by the AP equipment, another evaluation factor of the network quality between the main equipment and the sub-AP equipment is further obtained, the network quality is evaluated from different angles, the network topology structure between the AP equipment is obtained, the network quality between any two mutually connected AP equipment is obtained, and a user can conveniently and visually observe the network quality between the AP equipment.
EXAMPLE III
The master AP device performing a ping operation to the server to obtain a first network quality between the master AP device and the server, including: the main AP equipment executes ping operation in each time period to obtain average delay and packet loss rate in each time period; the main AP equipment obtains first network quality between the main AP equipment and the server according to the average delay and the packet loss rate; the time period is a first time length, the time for executing one ping operation is a second time length, and the first time length is greater than the second time length. Specifically, the second duration is less than half of the time period, i.e., the second duration is less than 0.5 times the first duration.
Fig. 4 is a flowchart of a network quality monitoring method according to another embodiment of the present invention, and as shown in fig. 4, the obtaining, by the master AP device, the first network quality between the master AP device and the server according to the average delay and the packet loss ratio specifically includes the following steps:
step S301: and when the packet loss rate is greater than or equal to a first packet loss rate threshold value, judging that the first network quality is disconnected.
Step S302: and if the packet loss rate is greater than a second packet loss rate threshold or the average delay is greater than a first delay threshold, determining that the first network quality is poor.
Step S303: if the packet loss rate is greater than a third packet loss rate threshold or the average delay is greater than a second delay threshold, determining that the first network quality is general; otherwise, judging that the first network quality is good.
The first packet loss rate threshold is 100%, which indicates that the master AP device and the server are in an unconnected state. And the second packet loss rate threshold, the third packet loss rate threshold, the first delay threshold and the second delay threshold are set according to the network quality standard actually required by the user. The specific condition of the first network quality between the main AP equipment and the server is realized by the main AP equipment executing ping operation on the server.
Example four
Each sub-AP device performs ping operation to the main AP device to obtain a second network quality between each sub-AP device and the main AP device, including: the sub AP equipment executes ping operation in each time period to obtain average time delay and packet loss rate in each time period; the sub-AP equipment obtains second network quality between the sub-AP equipment and the main AP equipment according to the average delay and the packet loss rate; the time period is a third time length, the time for executing one ping operation is a fourth time length, and the third time length is longer than the fourth time length. Specifically, the fourth duration is less than half of the time period, i.e., the fourth duration is less than 0.5 times the third duration.
Fig. 5 is a flowchart of a network quality monitoring method according to another embodiment of the present invention, where as shown in fig. 5, the sub-AP device obtains a second network quality between the sub-AP device and the main AP device according to the average delay and the packet loss ratio, and specifically includes the following steps:
step S401: and if the packet loss rate is greater than or equal to a fourth packet loss rate threshold value, judging that the second network quality is disconnected.
Step S402: and if the packet loss rate is greater than a fifth packet loss rate threshold or the average delay is greater than a third delay threshold, determining that the second network quality is poor.
Step S403: if the packet loss rate is greater than a sixth packet loss rate threshold or the average delay is greater than a fourth delay threshold, determining that the second network quality is general; otherwise, judging that the second network quality is good.
And the fourth packet loss rate threshold is 100%, which indicates that the sub-AP device and the main AP device are in an unconnected state. And setting a fifth packet loss rate threshold, a sixth packet loss rate threshold, a third delay threshold and a fourth delay threshold according to the network quality standard actually required by the user. The sub-AP device executes ping operation on the main AP device, and the specific condition of the second network quality between the sub-AP device and the main AP device is realized.
EXAMPLE five
Fig. 6 is a flowchart of a network quality monitoring method according to another embodiment of the present invention, and as shown in fig. 6, the monitoring method further includes: and the main AP equipment transmits the current network communication quality to the server through the server. The server can be a cloud server, and a user can download the current network communication quality from the cloud server. The main AP equipment comprises an application layer, the current network quality is directly transmitted to the mobile phone APP by the main AP equipment through the application layer, and a user can check the current network quality at any time.
EXAMPLE six
A network quality monitoring system, the monitoring system comprising: the system comprises a main AP device, a plurality of sub-AP devices and a server; the main AP equipment and the plurality of sub-AP equipment are networked in an MESH mode, and the main AP equipment is connected with the server; the main AP equipment is used for executing ping operation to the server and acquiring first network quality between the main AP equipment and the server; the plurality of sub-AP devices are used for respectively executing ping operation to the main AP device, acquiring second network quality between each sub-AP device and the main AP device, and transmitting the second network quality to the main AP device; the main AP equipment is further used for loading the first network quality and all the second network qualities into the current network topology structure to obtain the current network communication quality.
EXAMPLE seven
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program: the master AP equipment acquires a current network topology structure; the main AP equipment executes ping operation to the server to acquire first network quality between the main AP equipment and the server; each sub-AP device executes ping operation to the main AP device, acquires second network quality between each sub-AP device and the main AP device, and transmits the second network quality to the main AP device; and the main AP equipment loads the first network quality and all the second network qualities into the current network topology structure to obtain the current network communication quality.
Example eight
A readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of: the master AP equipment acquires a current network topology structure; the main AP equipment executes ping operation to the server to acquire first network quality between the main AP equipment and the server; each sub-AP device executes ping operation to the main AP device, acquires second network quality between each sub-AP device and the main AP device, and transmits the second network quality to the main AP device; and the main AP equipment loads the first network quality and all the second network qualities into the current network topology structure to obtain the current network communication quality.
According to the network quality monitoring method, system and device provided by the invention, the main AP equipment executes ping operation to the server to obtain the network quality between the server and the main AP equipment, each sub-AP equipment executes ping operation to the main AP equipment respectively to obtain the network quality between each sub-AP equipment and the main AP equipment, so that all the network qualities are obtained, a user can check all the network qualities, and the maintenance is carried out on the AP equipment with poor network quality. And the RSSI and the transmission rate of the AP equipment associated with the AP equipment are monitored by the AP equipment, another evaluation factor of the network quality between the main equipment and the sub-AP equipment is further obtained, the network quality is evaluated from different angles, the network topology structure between the AP equipment is obtained, and the network quality between any two mutually connected AP equipment is obtained.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a non-volatile computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the program is executed. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims (10)

1. A network quality monitoring method is characterized in that the method is applied to a network quality monitoring system, the network quality monitoring system comprises a main AP device, a plurality of sub-AP devices and a server, the main AP device and the plurality of sub-AP devices are networked in an MESH mode, the main AP device is connected with the server, and the monitoring method comprises the following steps:
the master AP equipment acquires a current network topology structure;
the main AP equipment executes ping operation to the server to acquire first network quality between the main AP equipment and the server;
each sub-AP device executes ping operation to the main AP device, acquires second network quality between each sub-AP device and the main AP device, and transmits the second network quality to the main AP device;
and the main AP equipment loads the first network quality and all the second network qualities into the current network topology structure to obtain the current network communication quality.
2. The method of claim 1, wherein the acquiring, by the master AP device, the current network topology includes:
the main AP equipment respectively monitors the RSSI and the sending rate of the sub-AP equipment associated with the main AP equipment to obtain a first monitoring result;
each sub-AP device monitors the RSSI and the sending rate of the sub-AP device associated with the sub-AP device respectively to obtain a second monitoring result, and transmits the second monitoring result to the main AP device;
and the master AP equipment generates the current network topology structure according to the first monitoring result and the second monitoring result.
3. The method of claim 1, wherein the master AP device performing a ping operation with the server to obtain a first network quality between the master AP device and the server, comprises:
the main AP equipment executes ping operation in each time period to obtain average delay and packet loss rate in each time period;
the main AP equipment obtains first network quality between the main AP equipment and the server according to the average delay and the packet loss rate;
the time period is a first time length, the time for executing one ping operation is a second time length, and the first time length is greater than the second time length.
4. The method of claim 3, wherein the obtaining, by the master AP device, the first network quality between the master AP device and the server according to the average delay and the packet loss ratio, comprises:
if the packet loss rate is greater than or equal to a first packet loss rate threshold value, judging that the first network quality is disconnected;
if the packet loss rate is greater than a second packet loss rate threshold or the average delay is greater than a first delay threshold, determining that the first network quality is poor;
if the packet loss rate is greater than a third packet loss rate threshold or the average delay is greater than a second delay threshold, determining that the first network quality is general;
otherwise, judging that the first network quality is good.
5. The method of claim 1, wherein the ping operation performed by the each sub-AP device to the master AP device to obtain the second network quality between the each sub-AP device and the master AP device comprises:
the sub AP equipment executes ping operation in each time period to obtain average time delay and packet loss rate in each time period;
the sub-AP equipment obtains second network quality between the sub-AP equipment and the main AP equipment according to the average delay and the packet loss rate;
the time period is a third time length, the time for executing one ping operation is a fourth time length, and the third time length is longer than the fourth time length.
6. The method of claim 5, wherein the obtaining, by the sub-AP device, the second network quality between the sub-AP device and the main AP device according to the average delay and the packet loss ratio, includes:
if the packet loss rate is greater than or equal to a fourth packet loss rate threshold, determining that the second network quality is disconnected;
if the packet loss rate is greater than a fifth packet loss rate threshold or the average delay is greater than a third delay threshold, determining that the second network quality is poor;
if the packet loss rate is greater than a sixth packet loss rate threshold or the average delay is greater than a fourth delay threshold, determining that the second network quality is general;
otherwise, judging that the second network quality is good.
7. The method of claim 1, wherein the method further comprises:
and the master AP equipment transmits the current network communication quality to the server.
8. A network quality monitoring system, the monitoring system comprising: the system comprises a main AP device, a plurality of sub-AP devices and a server; the main AP equipment and the plurality of sub-AP equipment are networked in an MESH mode, and the main AP equipment is connected with the server;
the main AP equipment is used for executing ping operation to the server and acquiring first network quality between the main AP equipment and the server;
the multiple sub-AP devices are used for respectively executing ping operation to the main AP device, acquiring second network quality between each sub-AP device and the main AP device, and transmitting the second network quality to the main AP device;
the main AP equipment is further used for loading the first network quality and all the second network qualities into the current network topology structure to obtain the current network communication quality.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of any of claims 1 to 7 are implemented by the processor when executing the computer program.
10. A readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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