CN115243336B - A method for preventing wireless terminal from switching between multiple APs - Google Patents

Abstract

The invention discloses a method for preventing a wireless terminal from being switched among multiple APs, which relates to the technical field of AP switching and aims to solve the problem of unstable connection between a wireless intelligent terminal and an AP in the prior art due to switching, and comprises the steps of configuring a network; through signal strength information comparison, marking the selected AP with an open connection mark for the wireless intelligent terminal; when a new AP is accessed, if the AP is abnormal, discarding the AP, and if the AP is not abnormal, hiding the AP; the wireless intelligent terminal is prevented from actively scanning or passively scanning; if the wireless intelligent terminal is disconnected with the AP and the disconnection time exceeds a first disconnection time threshold value, the information of the wireless intelligent terminal is cleared; when the AP is restarted, if the wireless intelligent terminal is not reconnected with the AP within the second disconnection time threshold, the AP with the best signal is reselected and connected; the invention has the advantage of more stable AP connection.

Description

A method for preventing wireless terminal from switching between multiple APs

technical field

The present invention relates to the technical field of AP switching, and more particularly to the technical field of a method for preventing a wireless terminal from switching between multiple APs.

Background technique

AP is the abbreviation of Access Point, which is generally translated as "wireless access node". It mainly provides two-way access for wireless terminals to the wired LAN, and wireless terminals within the coverage of the access point can communicate with each other through it.

The wireless smart terminal connects to the AP through scanning. There are two scanning methods. One is active scanning. The wireless smart terminal searches for the AP by broadcasting the Probe Req frame. After receiving it, the AP sends the Probe Rsp frame carrying the SSID information to the wireless smart terminal. The wireless smart terminal establishes a connection with the AP through the SSID information. The other is passive scanning. The wireless smart terminal periodically monitors the beacon frame (Beacon frame) of the AP, so as to establish a connection with the AP through the SSID information carried in the Beacon frame.

During the entire connection process, the smart terminal will judge the signal value of the AP to select an AP with a better signal to connect to. When the smart terminal device searches for multiple APs within the range, the signals are weak and similar. The following situation will occur: In the real environment, due to the existence of interference factors, the signal value of the AP is not constant. When the signal is low, the smart terminal will actively search for it. At time 1, the smart terminal will search for it. The signal value of AP1 is higher, and the terminal will connect to AP1 at this time. At time 2, the smart terminal finds that the signal value of AP2 is higher. At this time, the smart terminal will connect to AP2, and the process of switching networks is repeated. , causing the wireless smart terminal to go offline repeatedly.

The existing technology can efficiently and stably realize the communication between the wireless smart terminal and the AP when the signal is good and the signal value of the AP is large. When the wireless smart terminal searches for multiple APs within the range, and these The signal values of the AP are weak and similar. In this case, the existing technology cannot achieve stable communication between the wireless smart terminal and the AP.

Contents of the invention

The purpose of the present invention is to solve the problem in the prior art that the connection between the wireless intelligent terminal and the AP is unstable due to switching. In order to solve the above technical problems, the present invention provides a method for preventing a wireless terminal from switching between multiple APs.

The present invention specifically adopts the following technical solutions in order to achieve the above object:

A method for preventing a wireless terminal from switching between multiple APs, comprising the following steps:

Configure the network: configure the connection network between the wireless smart terminal and the AP;

The wireless intelligent terminal performs AP scanning, and the AP itself compares the signal strength information to select the AP with the best signal, and marks the selected AP as an open connection mark for the wireless intelligent terminal;

The wireless intelligent terminal is connected to the AP with the best signal;

Prevent wireless smart terminals from performing active scanning or passive scanning to discover and connect to other APs; prevent wireless smart terminals from actively scanning: mark other APs as not responding to the wireless smart terminal and hide them to prevent wireless smart terminals from passive scanning The method is: hide the SSID information carried by the Beacon frames of other APs;

When a new AP is connected, it is judged whether the AP is abnormal, and if it is abnormal, it will be discarded, and if it is not abnormal, it will be marked as a non-responsive terminal and hidden;

If the wireless intelligent terminal is disconnected from the AP, and the disconnection time exceeds the first disconnection time threshold, then clear the wireless intelligent terminal information in the association list, and set all APs to be connected, otherwise do not operate;

When the AP restarts, if the wireless intelligent terminal fails to reconnect to the AP within the second disconnection time threshold, all APs will be marked with an open connection mark for the wireless intelligent terminal, and the wireless intelligent terminal will reselect the signal for the last time. A good AP is connected, otherwise no operation is performed.

Preferably, the method for judging whether the AP is abnormal is as follows: if the signal value of the connected terminal of the AP is lower than 35db, it is judged as abnormal; otherwise, it is judged as non-abnormal.

Preferably, the method for marking other APs as not responding to the wireless smart terminal and being hidden includes the following steps:

The AP that is not connected with the wireless smart terminal binds the wireless smart terminal with the Drop flag, and when the AP that is not connected with the wireless smart terminal receives the Probe Req frame sent by the wireless smart terminal, it sends the The above-mentioned ProbeReq frame is discarded, so as not to respond to the wireless intelligent terminal.

Preferably, the method for the AP not connected to the wireless smart terminal to bind the wireless smart terminal with the Drop mark is: bind through the MAC address.

Preferably, the method of hiding the SSID information carried by the Beacon frames of other APs is: after 15 minutes after starting to configure the network, the WiFi information of other APs is hidden, and the WiFi information includes the AP's SSID information carried in the Beacon frame.

Preferably, the first disconnection time threshold is 120 seconds.

Preferably, when the AP with the best signal is selected, if the entire network restarts, it is necessary to wait for 30 seconds until the entire network restarts before selecting the AP with the best signal. Restarting the entire network means restarting all APs.

Preferably, the second disconnection time threshold is 120 seconds.

The beneficial effects of the present invention are as follows:

Only the AP with the optimal AP label can respond to the terminal's request, or it can respond to the terminal's request in the distribution network mode stage, which suppresses the switching problem to a certain extent;

The default is to hide the SSID information, in order to prevent the connection instability caused by redundant active scanning and passive scanning;

Through the comparison of signal strength information, the AP with the best signal is selected, and the AP is marked with the best AP label to respond to the terminal request, and the remaining APs are marked with the label of discarding all requests from the terminal to improve the connection quality;

When a new AP is connected, the AP will judge the signal value of the connected terminal. If it is lower than 35 db, the AP will actively kick the terminal, re-select the AP to open the connection, and mark the remaining APs as unresponsive terminals to further ensure the signal quality to ensure a stable connection.

Description of drawings

Fig. 1 is a schematic flow chart of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Example 1

Wireless access point (WirelessAccessPoint) is AP. AP is equivalent to a bridge connecting wired network and wireless network. Its main function is to connect various wireless network clients together, and then connect the wireless network to Ethernet.

The wireless smart terminal scans multiple APs within the range, and the signal values of these APs are low and similar. In this case, the wireless smart terminal will repeatedly switch between multiple APs, causing the wireless smart terminal device to repeatedly go offline and disconnect from the network. , thereby affecting the normal use of users.

Therefore, this embodiment provides a method for preventing a wireless terminal from switching between multiple APs, including the following steps:

Configure the network: configure the connection network between the wireless smart terminal and the AP; the configuration network here mainly refers to enabling BXoT (the function name) on the AC page, setting the Wifi name and password, and configuring the connection between the AP and the wireless smart terminal;

After the above basic configuration is completed, the AP with the best signal is selected by comparing the signal strength information, and the selected AP is marked with an open connection mark for the wireless smart terminal; in this step, the wireless smart terminal will send a message to the surrounding APs when scanning the surrounding APs. Scanning frame, each AP can obtain a corresponding signal strength when receiving this scanning frame. Since the distance between the AP and the terminal is different, the obtained signal strength is also different, and the obtained signal strength is used for comparison between APs. , and finally select the AP with the best signal among the APs, that is to say, when the wireless smart terminal scans, the AP will synchronize the signal strength information of the terminal to the neighbor AP, and select the AP with the best signal by comparing the signal strength information. The AP with the best signal is used to connect with the wireless smart terminal;

The wireless intelligent terminal is connected to the AP with the best signal;

Prevent wireless smart terminals from performing active scanning or passive scanning to discover and connect to other APs; prevent wireless smart terminals from actively scanning: mark other APs as not responding to the wireless smart terminal and hide them to prevent wireless smart terminals from passive scanning The method is: hide the SSID information carried by the Beacon frames of other APs; in order to prevent the wireless smart terminal from switching between different APs and causing unstable connections;

When a new AP is connected, it is judged whether the AP is abnormal. If it is abnormal, it will be discarded. If it is not abnormal, it will be marked as a non-responsive terminal and hidden. The information is synchronized to other connected APs.

If the wireless intelligent terminal is disconnected from the AP, and the time of disconnection exceeds the first disconnection time threshold time threshold, the wireless intelligent terminal information is cleared in the association list, and all APs are set to be connected, otherwise do not operate;

When the AP restarts, if the wireless intelligent terminal fails to reconnect to the AP within the second disconnection time threshold, all APs will be marked with an open connection mark for the wireless intelligent terminal, and the wireless intelligent terminal reselects the signal that is the last A good AP is connected, otherwise no operation is performed.

Example 2

This embodiment is based on the technical solution of Embodiment 1, and mainly refines the method for judging the abnormality of a newly accessed AP.

As a preferred solution of this embodiment, the method for judging whether the AP is abnormal is as follows: if the signal value of the connected terminal of the AP is lower than 35db, it is judged as abnormal; otherwise, it is judged as non-abnormal.

In this way, low-quality new APs are discarded, but it is particularly noted that even if the AP that has been connected before has a problem and the signal value of the connected terminal becomes lower than 35db, it will not be discarded.

Example 3

This embodiment is based on the technical solution of Embodiment 1, and describes how to specifically prevent wireless smart terminals from actively scanning to discover and connect.

First, the principle of active scanning is: the wireless smart terminal searches for the AP by broadcasting the Probe Req frame, and the AP sends a Probe Rsp frame carrying SSID information to the wireless smart terminal after receiving it, and the wireless smart terminal establishes a connection with the AP through the SSID information.

Therefore, in this embodiment, the method for preventing the wireless smart terminal from discovering and connecting to the AP by actively scanning, that is, marking other APs as not responding to the wireless smart terminal and being hidden includes the following steps:

The AP that is not connected with the wireless smart terminal binds the wireless smart terminal with the Drop flag, and when the AP that is not connected with the wireless smart terminal receives the Probe Req frame sent by the wireless smart terminal, it sends the The above-mentioned ProbeReq frame is discarded, so as not to respond to the wireless intelligent terminal. All frames sent by the wireless smart terminal bound with the Drop flag will be discarded by the corresponding AP.

In particular, if an accident occurs, causing all APs to bind the wireless smart terminal with the Drop flag, the frame of the wireless smart terminal will be discarded by all APs at this time, so the AP will check this situation and find the problem Then open all APs.

Further, as a preferred solution, the method for the AP not connected to the wireless smart terminal to bind the wireless smart terminal with the Drop flag is: bind through the MAC address.

Example 4

This embodiment is based on the technical solution of Embodiment 1, and describes how to prevent wireless smart terminals from discovering and connecting through passive scanning.

The principle of passive scanning is: the wireless smart terminal periodically monitors the beacon frame (Beacon frame) of the AP, so as to establish a connection with the AP through the SSID information carried in the Beacon frame.

Therefore, in this embodiment, the method for preventing wireless smart terminals from discovering and connecting to APs by means of passive scanning, that is, the method for hiding the SSID information carried in Beacon frames of other APs, includes the following steps:

Hide the SSID information carried in the AP's Beacon frame.

As a preferred solution, the hiding of the SSID information carried in the Beacon frame of the AP is performed 15 minutes after the start of network configuration. The usual start of configuring the network can be realized by a button. After pressing the button, it enters the configuration network mode, that is, after 15 minutes, the SSID information is hidden. During these 15 minutes, it is generally enough for the user to complete the configuration of the network.

Example 5

This embodiment is based on the technical solution of Embodiment 1. For "if the wireless intelligent terminal is disconnected from the AP, and the disconnection time exceeds the first disconnection time threshold time threshold, then clear the wireless intelligent terminal information in the association list." , and set all APs to be connected" for optimization.

As a preferred solution of this embodiment, the first disconnection time threshold may be selected as 120 seconds.

Example 6

This embodiment is based on the technical solution of Embodiment 1, and improves the selection of the AP with the best signal.

When selecting the AP with the best signal, if the entire network restarts, you need to wait until the entire network restarts for 30 seconds before selecting the AP with the best signal. Restarting the entire network means restarting all APs.

Example 7

In this embodiment, based on the technical solution of Embodiment 1, the second disconnection time threshold is set in detail.

In this embodiment, the second disconnection time threshold is 120 seconds.

Claims (8)

1. A method for preventing a wireless terminal from switching between multiple APs, comprising the steps of:

configuring a network: configuring a connection network of the wireless intelligent terminal and the AP;

the method comprises the steps that the wireless intelligent terminal scans the AP, the AP with the best signal is selected by comparing signal strength information, and the selected AP is marked with an open connection mark for the wireless intelligent terminal;

the wireless intelligent terminal is connected with the AP with the best signal;

the wireless intelligent terminal is prevented from carrying out active scanning or passive scanning to discover and connect other APs; the mode for preventing the wireless intelligent terminal from actively scanning is as follows: marking other APs with marks which do not respond to the wireless intelligent terminal and hiding the marks; the mode for preventing the wireless intelligent terminal from carrying out passive scanning is as follows: hiding SSID information carried by Beacon frames of other APs;

when a new AP is accessed, judging whether the AP is abnormal or not, if so, discarding, and if not, marking a non-response terminal and hiding;

if the wireless intelligent terminal is disconnected with the AP and the disconnection time exceeds a first disconnection time threshold, removing the information of the wireless intelligent terminal from the association list, and setting all the APs to be in a state to be accessed, otherwise, not operating;

and when the AP is restarted, if the wireless intelligent terminal cannot be reconnected with the AP within the second disconnection time threshold, marking open connection marks on the wireless intelligent terminal on all the APs, reselecting the AP with the best signal for connection by the wireless intelligent terminal, and otherwise, not operating.

2. The method of claim 1, wherein the method for determining whether the AP is abnormal comprises: and if the signal value of the down-hanging terminal of the AP is lower than 35db, judging the AP is abnormal, otherwise, judging the AP is not abnormal.

3. The method of claim 1, wherein the method of marking other APs that do not respond to the wireless intelligent terminal and are hidden comprises the following steps:

and the AP which is not connected with the wireless intelligent terminal binds the wireless intelligent terminal with the Drop mark, and when the AP which is not connected with the wireless intelligent terminal receives a Probe Req frame sent by the wireless intelligent terminal, the AP discards the Probe Req frame so as to achieve the aim of not responding to the wireless intelligent terminal.

4. The method of claim 3, wherein the AP not connected to the wireless smart terminal binds the wireless smart terminal to the Drop flag by: binding is done by MAC address.

5. The method according to claim 1, wherein the method for hiding SSID information carried by Beacon frames of other APs comprises: and after 15 minutes of starting to configure the network, performing hiding WiFi information of other APs, wherein the WiFi information comprises SSID information carried by the Beacon frame.

6. The method of claim 1, wherein the first time threshold for disconnection is 120 seconds.

7. The method as claimed in claim 1, wherein when selecting the AP with the best signal, if a network restart is encountered, the method waits for 30 seconds before selecting the AP with the best signal, and the network restart is a restart of all APs.

8. The method of claim 1, wherein the second time threshold for disconnection is 120 seconds.

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