WO2022095855A1

WO2022095855A1 - Connection method, apparatus and system, and electronic device and computer-readable storage medium

Info

Publication number: WO2022095855A1
Application number: PCT/CN2021/128222
Authority: WO
Inventors: 池艳广; 曹明明; 王浩磊
Original assignee: 中兴通讯股份有限公司
Priority date: 2020-11-03
Filing date: 2021-11-02
Publication date: 2022-05-12
Also published as: CN114448741A

Abstract

Provided are a connection method, apparatus and system, and an electronic device and a computer-readable storage medium. The connection method comprises: where there is a third node connected to a first node, the first node monitoring a first signal quality evaluation index of the third node; where the first signal quality evaluation index of the third node is less than a first pre-set threshold value, the first node triggering the third node to measure a second signal quality evaluation index of a second node; and where the difference between the second signal quality evaluation index and the first signal quality evaluation index is greater than a second pre-set threshold value, the first node being disconnected from the third node.

Description

Connection method, apparatus and system, electronic device, computer-readable storage medium

cross reference

This application is based on the Chinese patent application with the application number "202011213042.5" and the filing date is November 03, 2020, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated by reference Apply.

technical field

The embodiments of the present application relate to the field of communications, and in particular, to connection methods, apparatuses, and systems, electronic devices, and computer-readable storage media.

Background technique

In the home use scenario of an optical network unit (ONU, Optical Network Unit), a wireless terminal (STA, Station) generally directly accesses the Internet (Internet) through the wireless local area network (WLAN, Wireless Local Area Network) hotspot that comes with the ONU. The networking situation is shown in Figure 1. However, on the one hand, due to the cost constraints of the ONU manufacturer, the ONU does not have an external antenna, resulting in a poor WLAN signal of the ONU; on the other hand, the operator's performance is under great pressure. The routers (ie access points (AP, Access Point)) are sold in bundles, so the WLAN signal of the purchased ONU is poor. Based on the above two reasons, many users have installed two devices, the ONU and the AP (that is, a router with WLAN) at the same time. The AP accesses the Internet through the ONU's local area network (LAN, LocalAreaNetwork) interface. The networking situation is shown in Figure 2. .

In order to improve the coverage of the WLAN network, the actual physical distance between the ONU and the AP is generally relatively far, so as to make up for the insufficient coverage of the other party. Since the WLAN coverage of the ONU is insufficient, when the STA is far away from the ONU, the signal quality of the WLAN network connected by the STA is relatively poor, which is likely to cause complaints. At the same location, the signal quality of the AP may be relatively good, but due to the design mechanism of the STA itself, the ONU may not necessarily be abandoned and the AP will be associated.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a connection method, apparatus, and system, an electronic device, and a computer-readable storage medium.

In a first aspect, an embodiment of the present application provides a connection method, including:

In the case that the third node is connected to the first node, the first node monitors the first signal quality evaluation index of the third node;

When the first signal quality evaluation index of the third node is smaller than the first preset threshold, the first node triggers the third node to measure the second signal quality evaluation index for the second node;

When the difference between the second signal quality evaluation index and the first signal quality evaluation index is greater than the second preset threshold, the first node is disconnected from the third node.

In a second aspect, an embodiment of the present application provides an electronic device, including:

at least one processor;

A memory, where at least one program is stored, and when the at least one program is executed by the at least one processor, any one of the above connection methods is implemented.

In a third aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, any one of the above connection methods is implemented.

In a fourth aspect, an embodiment of the present application provides a first node, including:

a monitoring module, configured to monitor the first signal quality evaluation index of the third node when the third node is connected to the first node;

a measurement triggering module, configured to trigger the third node to measure the second signal quality evaluation index on the second node when the first signal quality evaluation index of the third node is smaller than the first preset threshold;

The connection module is configured to disconnect from the third node when the difference between the second signal quality evaluation index and the first signal quality evaluation index is greater than the second preset threshold.

In a fifth aspect, an embodiment of the present application provides a connection system, including:

The first node, for:

In the case that a third node is connected to the first node, monitoring the first signal quality evaluation index of the third node;

In the case that the first signal quality evaluation index of the third node is smaller than the first preset threshold, triggering the third node to measure the second signal quality evaluation index for the second node;

Disconnecting from the third node when the difference between the second signal quality evaluation index and the first signal quality evaluation index is greater than the second preset threshold;

The third node, for:

Under the trigger of the first node, measure the second signal quality evaluation index on the second node; disconnect from the first node.

Description of drawings

FIG. 1 is a schematic diagram of a network in the related art in which a STA accesses the Internet through a WLAN hotspot provided by an ONU;

FIG. 2 is a schematic diagram of the networking of the AP accessing the Internet through the LAN port of the ONU in the related art;

3 is a flowchart of a connection method provided by an embodiment of the present application;

FIG. 4 is an interactive schematic diagram of a connection method provided by an example of an embodiment of the present application;

FIG. 5 is a block diagram of the composition of a first node provided by another embodiment of the present application;

FIG. 6 is a block diagram of a connection system provided by another embodiment of the present application.

Detailed ways

In order for those skilled in the art to better understand the technical solutions of the present application, the connection method, device and system, electronic device, and computer-readable storage medium provided by the present application are described in detail below with reference to the accompanying drawings.

Example embodiments are described more fully hereinafter with reference to the accompanying drawings, but which may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

Various embodiments of the present application and various features in the embodiments may be combined with each other without conflict.

As used herein, the term "and/or" includes any and all combinations of at least one of the associated listed items.

The terminology used herein is used to describe particular embodiments only and is not intended to limit the application. As used herein, the singular forms "a" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It will also be understood that when the terms "comprising" and/or "made of" are used in this specification, the stated features, integers, steps, operations, elements and/or components are specified to be present, but not precluded or Add at least one other feature, integer, step, operation, element, component, and/or group thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be construed as having meanings consistent with their meanings in the context of the related art and this application, and will not be construed as having idealized or over-formal meanings, unless expressly so limited herein.

The more popular method to solve the coverage problem in multi-AP scenarios is WiFi Mesh (wireless mesh network). WiFi Mesh, also known as a "multi-hop" network, is a wireless local area network solution that is more suitable for open areas with large coverage. But Mesh has several problems:

a. The application of Mesh in China is in the exploratory stage, not yet mature, and there is no large-scale popularization and commercial use;

b. Mesh has relatively high software requirements for devices, and requires all devices participating in the networking to fully implement the Mesh protocol and the P1905 protocol;

In general, although the Mesh solution can cope with the above scenarios, it is cumbersome and difficult to deploy.

It should be noted that, although the connection method in the embodiment of the present application is proposed based on the home use scenario of the ONU, the connection method in the embodiment of the present application is also applicable to other application scenarios, and the specific application scenario is not used to limit the application. The protection scope of the connection method of the embodiment. For example, it can be applied to the following application scenarios: a first node (such as an ONU) is directly connected to the Internet, a second node (such as an AP) is connected to the first node through a wired connection to connect to the Internet, and a third node (such as a STA) is wirelessly connected to the Internet. The first node or the second node is connected in a way to connect with the Internet. The first node, the second node and the third node may be any kind of communication nodes. The following description will be made from the perspectives of the first node, the second node, and the third node.

In the connection method provided by the embodiment of the present application, the first signal quality evaluation index when the third node is connected to the first node and the second signal quality evaluation index when the third node is connected to the second node are measured, and the third node is connected to the second node. When the difference between the second signal quality evaluation index and the first signal quality evaluation index is greater than the second preset threshold, that is, when the signal quality provided by the first node is lower than the signal quality provided by the second node, the first node Disconnecting from the third node makes the first node no longer provide network connection services for the third node, and the third node searches for other network connections, so that connection switching can be achieved through simple measurement.

FIG. 3 is a flowchart of a connection method provided by an embodiment of the present application.

In the first aspect, referring to FIG. 3 , an embodiment of the present application provides a connection method, including:

Step 300: In the case that a third node is connected to the first node, the first node monitors the first signal quality evaluation index of the third node.

In some exemplary embodiments, the first signal quality evaluation index includes: Received Signal Strength Indication (RSSI, Received Signal Strength Indication). Of course, the first signal quality evaluation index may also be other indicators used for evaluating signal quality, and the specific index is not used to limit the protection scope of the embodiment of the present application.

In some exemplary embodiments, the first node may periodically monitor the first signal quality evaluation index of the third node, and may also periodically monitor the first signal quality evaluation index of the third node. What time interval is specifically used to monitor the first signal quality evaluation index of the third node is not used to limit the protection scope of the embodiments of the present application.

Step 301: When the first signal quality evaluation index of the third node is smaller than the first preset threshold, the first node triggers the third node to measure the second signal quality evaluation index for the second node.

In some exemplary embodiments, the fact that the first signal quality evaluation index of the third node is smaller than the first preset threshold may mean that the first signal quality evaluation index of the third node is monitored to be smaller than the first preset threshold at a certain time, or it may It means that the first signal quality evaluation index of the third node is monitored several times in a row to be less than the first preset threshold, or it can be that the first signal quality evaluation index of the third node is monitored to be less than the first preset threshold within a certain period of time. The form is not used to limit the protection scope of the embodiments of the present application.

In some exemplary embodiments, the first signal quality evaluation index of the third node being less than the first preset threshold includes:

The RSSI in the first signal quality evaluation index of the third node is smaller than the first preset threshold.

In some exemplary embodiments, before the first node regularly monitors the first signal quality evaluation index of the third node, the method further includes: the first node receives the WLAN information of the second node;

The first node triggering the third node to measure the second signal quality evaluation index on the second node includes: the first node triggering the third node to measure the second signal quality evaluation index for the second node according to the WLAN information.

In some exemplary embodiments, receiving the WLAN information of the second node by the first node includes:

The first node receives a Dynamic Host Configuration Protocol (DHCP, Dynamic Host Configuration Protocol) discovery request sent by the second node; wherein the DHCP discovery request includes: an option 60 (option 60) attribute, and the option 60 attribute includes WLAN information.

In some exemplary embodiments, before the first node receives the WLAN information of the second node, the method further includes:

The second node sends the WLAN information of the second node to the first node.

In some exemplary embodiments, sending the WLAN information of the second node to the first node by the second node includes:

The second node sends a DHCP discovery request to the first node; wherein, the DHCP discovery request includes: an option 60 attribute, and the option 60 attribute includes WLAN information.

Of course, in other application scenarios, the WLAN information of the second node may be carried in other messages and sent. This embodiment of the present application does not limit what message is used to transmit the WLAN information of the second node. The embodiment of the present application emphasizes that The second node sends the WLAN information of the second node to the first node, so that when the first signal quality evaluation index of the third node is smaller than the first preset threshold, the first node triggers the third node to The two nodes measure the second signal quality evaluation index.

In some exemplary embodiments, the method further includes:

The third node measures the second signal quality evaluation index on the second node under the trigger of the first node.

In some exemplary embodiments, the WLAN information includes at least one of the following:

Basic service set identifier (BSSID, BasicServiceSetIdentifier), channel, service set identifier (SSID, ServiceSetIdentifier) name.

Of course, in other application scenarios, the WLAN information may also be other information, as long as the third node can measure the second node or the third node is connected to the second node. The specific information included in the WLAN is not used to limit the protection scope of the embodiments of the present application.

In some exemplary embodiments, the triggering of the first node by the third node to measure the second signal quality evaluation index on the second node includes:

The first node sends a measurement request to the third node; the first node receives the measurement response returned by the third node; wherein the measurement response includes: a second signal quality evaluation index.

In some exemplary embodiments, the measurement request may include WLAN information, and the third node measures the second signal quality evaluation index for the second node according to the WLAN information.

In some exemplary embodiments, the measurement request may be an 11k measurement request, the measurement response may be an 11k measurement response, the measurement request and the measurement response may also be other measurement messages, and the specific message forms are not used to limit the protection of the embodiments of the present application scope.

In some exemplary embodiments, the second signal quality evaluation index includes: RSSI. Of course, the second signal quality evaluation index may also be other indicators used for evaluating signal quality, and the specific index is not used to limit the protection scope of the embodiment of the present application.

In some exemplary embodiments, when the first signal quality evaluation index of the third node is greater than or equal to the first preset threshold, continue to detect the first signal quality evaluation index.

Step 302: In the case that the difference between the second signal quality evaluation index and the first signal quality evaluation index is greater than a second preset threshold, disconnect the first node from the third node.

In some exemplary embodiments, the difference between the second signal quality evaluation index and the first signal quality evaluation index being greater than the second preset threshold includes:

The difference between the RSSI in the second signal quality evaluation index and the RSSI in the first signal quality evaluation index is greater than the second preset threshold.

In some exemplary embodiments, when the difference between the second signal quality evaluation index and the first signal quality evaluation index is greater than a second preset threshold, the method further includes:

The first node sends the WLAN information to the third node, so that the third node is connected to the second node according to the WLAN information.

The first node pulls the third node into the blacklist within a preset time, so that the third node cannot connect to the first node within the preset time.

In some exemplary embodiments, the first node may determine whether to send the WLAN information to the third node or to blacklist the third node within a preset time according to whether the third node supports 11v. Specifically, when the third node supports 11v, the first node sends the WLAN information to the third node, so that the third node connects to the second node according to the WLAN information; when the third node does not support 11v, the third node A node pulls the third node into the blacklist within a preset time, so that the third node cannot connect to the first node within the preset time, so that the first node will look for other connection methods.

In some exemplary embodiments, the first node may also monitor the rate of the third node, and if the rate of the third node is less than or equal to a third preset threshold, perform the steps of any one of the preceding methods;

When the rate of the third node is greater than the third preset threshold, the process ends.

The specific implementation process of the connection method of the embodiment of the present application will be described in detail below by using a specific example. The listed example is only for the convenience of description, and it should not be considered that the listed example is the only achievable way of the connection method of the embodiment of the present application. That is to say, the listed examples cannot be used to limit the protection scope of the embodiments of the present application.

Example

As shown in Figure 4, the method includes:

1. The WLAN module on the AP reports the WLAN information such as BSSID, channel, and SSID name to the DHCP module on the local machine, which is mainly used to subsequently report the AP's WLAN information to the ONU through DHCP packets;

2. In the DHCP interaction phase, the DHCP module of the AP transmits the WLAN information (BSSID, channel, SSID name, etc.) of the AP to the DHCP module of the ONU through the option 60 field, and then the ONU can obtain the WLAN information of the AP;

3. After the DHCP module of the ONU receives the DHCP message from the AP, it parses the option 60 field, extracts the WLAN information (BSSID, channel, SSID name, etc.) reported by the AP and reports it to the WLAN module of the ONU;

4. After the WLAN module of the ONU receives the WLAN information of the AP sent by the DHCP module of the ONU, it records it for possible subsequent measurements;

5. The WLAN module of the ONU initiates periodic detection to detect whether there is STA access;

If there is access, step 6 will acquire the first signal quality evaluation index of the STA;

If there is no access, wait and continue to detect;

6. The ONU obtains the first signal quality evaluation index of the STA, and mainly focuses on RSSI.

If the first signal quality evaluation index is continuously smaller than the first preset threshold for a period of time, the ONU triggers the STA to perform 11k measurement on the AP, that is, the ONU sends a 11k measurement request to the STA; the 11k measurement request includes WLAN information; the STA performs 11k measurement on the AP. Measuring to obtain a second signal quality evaluation index; the STA returns a 11k measurement response to the ONU; wherein, the 11k measurement response includes: the second signal quality evaluation index; go to step 7;

If the first signal quality evaluation index is continuously greater than or equal to the first preset threshold, there is no next action, but periodic detection is continued.

7. If the difference between the second signal quality evaluation index when the STA connects to the AP and the first signal quality evaluation index when the STA connects to the ONU is greater than the second preset threshold, the ONU will perform further processing according to whether the STA supports 11v:

If the STA does not support 11v, the STA will be de-authenticated (DEAUTH) and blacklisted for a certain period of time;

If the STA supports 11v, it initiates a BSS transition management (BTM, BSSTransitionManagement) request (BTM Request), notifies the STA of the AP's WLAN information, guides the STA to access the AP, and the STA returns a BTM response (BTMResponse) to the ONU.

8. Regardless of whether the STA supports 11v or not, the final STA will automatically associate with the AP.

at least one processor;

Wherein, the processor is a device with data processing capability, which includes but is not limited to a central processing unit (CPU), etc.; the memory is a device with data storage capability, which includes but is not limited to random access memory (RAM, more specifically such as SDRAM) , DDR, etc.), read-only memory (ROM), charged erasable programmable read-only memory (EEPROM), flash memory (FLASH).

In some embodiments, the processor and memory are interconnected by a bus, which in turn is connected to other components of the computing device.

FIG. 5 is a block diagram of the composition of a first node according to another embodiment of the present application.

In a fourth aspect, referring to FIG. 5 , another embodiment of the present application provides a first node, including:

A monitoring module 501, configured to monitor the first signal quality evaluation index of the third node when a third node is connected to the first node;

A measurement triggering module 502, configured to trigger the third node to measure the second signal quality evaluation index on the second node when the first signal quality evaluation index of the third node is smaller than the first preset threshold;

The connection module 503 is configured to disconnect from the third node when the difference between the second signal quality evaluation index and the first signal quality evaluation index is greater than the second preset threshold.

In some exemplary embodiments, the measurement triggering module 502 is also used to:

Receive the wireless local area network information of the second node; when the first signal quality evaluation index of the third node is less than the first preset threshold, trigger the third node to perform a second signal quality evaluation index on the second node according to the wireless local area network information Measurement.

In some exemplary embodiments, the connection module 503 is also used to:

The wireless local area network information is sent to the third node, so that the third node is connected to the second node according to the wireless local area network information.

In some exemplary embodiments, the wireless local area network information includes at least one of the following:

Basic Service Set ID, Channel, Service Set ID Name.

In some exemplary embodiments, the connection module 503 is also used to:

In some exemplary embodiments, the measurement triggering module 502 is specifically configured to trigger the third node to measure the second signal quality evaluation index on the second node in the following manner:

Send a measurement request to the third node; receive a measurement response returned by the third node; wherein the measurement response includes: a second signal quality evaluation index.

In some exemplary embodiments, the first signal quality evaluation index includes: a received signal strength indication;

The second signal quality evaluation index includes: received signal strength indication.

The specific implementation process of the above-mentioned first node is the same as the specific implementation process of the connection method in the foregoing embodiment, and details are not repeated here.

In a fifth aspect, referring to FIG. 6 , another embodiment of the present application provides a connection system, including:

The first node 601 is used for:

The third node 602 is used for:

In some exemplary embodiments, the first node 601 is also used to:

receiving the wireless local area network information of the second node;

triggering the third node to measure the second signal quality evaluation index on the second node according to the wireless local area network information;

Also includes:

The second node 603 is used for:

sending wireless local area network information to the first node;

The third node 602 is specifically configured to measure the second signal quality evaluation index for the second node under the trigger of the first node in the following manner: under the trigger of the first node, perform the second Measurement of signal quality evaluation metrics.

In some exemplary embodiments, the first node 601 is further configured to: send the wireless local area network information to the third node, so that the third node is connected to the second node according to the wireless local area network information.

Basic Service Set ID, Channel, Service Set ID Name.

In some exemplary embodiments, the first node 601 is further configured to: pull the third node into the blacklist within a preset time, so that the third node cannot connect to the first node within the preset time.

In some exemplary embodiments, the first node 601 is specifically configured to trigger the third node to measure the second signal quality evaluation index on the second node in the following manner:

sending a measurement request to a third node; receiving a measurement response returned by the third node; wherein the measurement response includes: a second signal quality evaluation index;

The third node 602 is specifically configured to implement the measurement of the second signal quality evaluation index on the second node under the triggering of the first node in the following manner:

Receive the measurement request sent by the first node; measure the second signal quality evaluation index on the second node; and return a measurement response to the third node.

Those of ordinary skill in the art can understand that all or some of the steps in the methods disclosed above, functional modules/units in the systems, and devices can be implemented as software, firmware, hardware, and appropriate combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be composed of several physical components Components execute cooperatively. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit . Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those of ordinary skill in the art, the term computer storage media includes both volatile and nonvolatile implemented in any method or technology for storage of information, such as computer readable instructions, data structures, program modules or other data flexible, removable and non-removable media. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, magnetic tape, magnetic disk storage or other magnetic storage, or available with Any other medium that stores the desired information and can be accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and can include any information delivery media, as is well known to those of ordinary skill in the art .

Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should only be construed in a general descriptive sense and not for purposes of limitation. In some instances, it will be apparent to those skilled in the art that features, characteristics and/or elements described in connection with a particular embodiment may be used alone or in combination with other embodiments, unless expressly stated otherwise. Features and/or elements are used in combination. Accordingly, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the application as set forth in the appended claims.

Claims

A connection method comprising:

In the case that a third node is connected to the first node, the first node monitors the first signal quality evaluation index of the third node;

In the case that the first signal quality evaluation index of the third node is smaller than the first preset threshold, the first node triggers the third node to measure the second signal quality evaluation index for the second node;

When the difference between the second signal quality evaluation index and the first signal quality evaluation index is greater than a second preset threshold, the first node is disconnected from the third node.
The connection method according to claim 1, before the first node regularly monitors the first signal quality evaluation index of the third node, the method further comprises: the first node receiving the wireless local area network information of the second node;

Triggering, by the first node, the third node to perform measurement of the second signal quality evaluation index on the second node includes: triggering, by the first node, the third node to perform a second measurement on the second node according to the wireless local area network information. Measurement of signal quality evaluation metrics.
The connection method according to claim 2, wherein, when the difference between the second signal quality evaluation index and the first signal quality evaluation index is greater than a second preset threshold, the method further comprises:

The first node sends the wireless local area network information to the third node, so that the third node connects to the second node according to the wireless local area network information.
The connection method according to claim 2 or 3, wherein the wireless local area network information includes at least one of the following:

Basic Service Set ID, Channel, Service Set ID Name.
The connection method according to any one of claims 1 to 4, wherein, when the difference between the second signal quality evaluation index and the first signal quality evaluation index is greater than a second preset threshold, the method Also includes:

The first node pulls the third node into the blacklist within a preset time, so that the third node cannot connect to the first node within the preset time.
The connection method according to any one of claims 1 to 5, wherein the triggering, by the first node, the third node to measure the second signal quality evaluation index on the second node comprises:

sending, by the first node, a measurement request to the third node;

The first node receives the measurement response returned by the third node; wherein the measurement response includes: the second signal quality evaluation index.
The connection method according to any one of claims 1 to 6, wherein the first signal quality evaluation index includes: a received signal strength indicator; the second signal quality evaluation index includes: a received signal strength indicator.
An electronic device comprising:

at least one processor;

A memory, where at least one program is stored, and when the at least one program is executed by the at least one processor, the connection method according to any one of claims 1-7 is implemented.
A computer-readable storage medium storing a computer program on the computer-readable storage medium, when the computer program is executed by a processor, implements the connection method according to any one of claims 1-7.
A first node, comprising:

a monitoring module, configured to monitor the first signal quality evaluation index of the third node when the third node is connected to the first node;

a measurement triggering module, configured to trigger the third node to measure the second signal quality evaluation index on the second node when the first signal quality evaluation index of the third node is smaller than the first preset threshold;

The connection module is configured to disconnect from the third node when the difference between the second signal quality evaluation index and the first signal quality evaluation index is greater than the second preset threshold.
A connection system comprising:

The first node, for:

In the case that a third node is connected to the first node, monitoring the first signal quality evaluation index of the third node;

Triggering the third node to measure the second signal quality evaluation index on the second node when the first signal quality evaluation index of the third node is smaller than the first preset threshold;

Disconnecting from the third node when the difference between the second signal quality evaluation index and the first signal quality evaluation index is greater than a second preset threshold;

The third node, for:

The second node is triggered by the first node to measure the second signal quality evaluation index; when the difference between the second signal quality evaluation index and the first signal quality evaluation index is greater than a second preset threshold , disconnect from the first node.