WO2016192224A1

WO2016192224A1 - Method for matching access point in wireless local area network, central control unit and access points

Info

Publication number: WO2016192224A1
Application number: PCT/CN2015/089059
Authority: WO
Inventors: 邵名波
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-06-01
Filing date: 2015-09-07
Publication date: 2016-12-08
Also published as: CN106304279A

Abstract

A method for matching a access point in a wireless local area network, comprising: a central control unit acquires a detection request, reported by a plurality of access points, of a target terminal; acquire, according to the detection request, received signal strength indications (RSSI) relative to the target terminal of all the access points; select the access point corresponding to the strongest RSSI as a best match access point; and issue a detection permission command to the best match access point, and the best match access point adds, according to the received detection permission command, information about the target terminal into a detection permission linked list of the best match access point.

Description

Wireless local area network matching access point method, central control device and access point

Technical field

This document relates to, but is not limited to, the field of network technologies, and in particular, to a method for matching access points in a wireless local area network, a central control device, an access point, and a computer readable storage medium.

Background technique

With the development of Wireless Local Area Network (WLAN) technology, the physical layer rate of WLAN continues to increase, and the number of service bandwidths and supported wireless terminals (Stations, STAs) is also increasing, especially for smartphones and tablets. The popularity of intelligent terminals such as computers and the widespread support of WLAN technologies by smart terminals require a large number of terminals to simultaneously access the WLAN system. However, due to a series of inherent problems such as hidden node problem, co-frequency and adjacent-frequency interference, ping-pong effect, flower-inlaid coverage, and unequal access terminal efficiency of the WLAN system, the terminal actually accesses, especially in high-density access. In this case, it is difficult to ensure that each terminal can access and stably perform data transmission, and there are often problems such as low access efficiency and unstable network signal.

Summary of the invention

The following is a summary of the subject matter described in detail herein, and is not intended to limit the scope of the claims.

The embodiment of the invention provides a method for matching an access point in a wireless local area network, a central control device and an access point, which effectively improves the efficiency of the terminal accessing the WLAN system and ensures the stability of the network signal.

Embodiments of the present invention provide a method for matching an access point in a wireless local area network, including the following steps:

The central control device acquires the probe request from the target terminal reported by the multiple access points;

Obtaining, according to the probe request, a field strength RSSI (Received Signal Strength Indication) of each access point relative to the target terminal;

Select the access point corresponding to the strongest RSSI as the best matching access point;

And sending an allowable probe command to the best matching access point, where the best matching access point adds information of the target terminal to the best matching access point according to the received allowable probe command. Allow detection in the linked list.

Optionally, the step of delivering the allowable probe command to the best matching access point further includes:

Calculating a difference between an RSSI of the best matching access point relative to the target terminal and an RSSI of a previous matching target point of the target terminal with respect to the target terminal;

Determining whether the difference is greater than or equal to a preset field strength difference;

If the difference is greater than or equal to the preset field strength difference, performing the step of issuing an allowable probe command to the best matching access point;

If the difference is less than the preset field strength difference, the permission detection instruction is sent to the access point that the target terminal previously matched.

Optionally, after the step of sending the allowable probe command to the best matching access point, the method further includes:

And sending, by the access point that is matched by the target terminal, a prohibition detection instruction, where the previously matched access point, according to the received prohibition detection instruction, information of the target terminal from the previous matching The access point's allowed probe list is deleted.

Optionally, after the step of obtaining the field strength RSSI of each access point relative to the target terminal according to the probe request, the method further includes:

And sequentially, the plurality of access points are sequentially sorted according to the strength of the RSSI of each of the access points with respect to the target terminal, and are updated to the probe information list of the central control device corresponding to the target terminal;

The step of selecting the access point corresponding to the strongest RSSI as the best matching access point includes:

An access point corresponding to the strongest RSSI is selected as the best matching access point from the probe information list corresponding to the target terminal of the central control device.

The embodiment of the invention further provides a method for matching an access point in a wireless local area network, comprising the steps of:

The current access point receives the probe request sent by the target terminal;

Sending the probe request of the target terminal to the central control device, where the central control device obtains the field strength RSSI of the current access point with respect to the target terminal according to the probe request, and is controlled by the central control device according to the The RSSI determines whether an allowable probe command is sent to the current access point;

When the permission detection instruction issued by the central control device is received, the information of the target terminal is added to the allowed detection list of the current access point.

Optionally, before the step of sending the probe request of the target terminal to the central control device, the method further includes:

Obtaining a field strength RSSI of the current access point relative to the target terminal according to the probe request;

Determining whether the RSSI is greater than or equal to a preset threshold;

If the RSSI is greater than or equal to a preset threshold, performing the step of transmitting the probe request of the target terminal to the central control device;

If the RSSI is less than a preset threshold, the probe request is discarded.

Optionally, after the step of sending the probe request of the target terminal to the central control device, the method further includes:

When the prohibition detection instruction sent by the central control device is received, the information of the target terminal is deleted from the allowed detection list of the current access point.

Optionally, after the step of adding the information of the target terminal to the allowed probe list of the current access point, the method further includes:

Determining, according to the probe request of the target terminal that is received this time or the probe request of the target terminal that is received next time, whether the information of the target terminal exists in the allowable probe list of the current access point;

If the information of the target terminal exists in the allowed probe list of the current access point, the probe response is replied to the target terminal;

If the information of the target terminal does not exist in the allowed probe list of the current access point, the probe response is refused to be returned to the target terminal.

Optionally, before the step of the current access point receiving the probe request sent by the target terminal, the method further includes:

Deleting an SSID (Service Set Identifier) in a beacon frame of the current access point, and hiding the beacon frame;

The step of replying the probe response to the target terminal further includes:

The SSID is added to the probe response.

The embodiment of the invention further provides a central control device for a wireless local area network matching access point, comprising:

The upper-level network module is configured to acquire a probe request from the target terminal that is reported by multiple access points;

a field strength analysis module, configured to obtain a field strength RSSI of each access point relative to the target terminal according to the probe request;

The matching analysis module is configured to select an access point corresponding to the strongest RSSI as the best matching access point;

The upper-level network module is further configured to: send an allowable probe command to the best-matching access point, where the best-matching access point adds the information of the target terminal to the received probe command according to the received The best match access point is allowed in the probe list.

Optionally, the matching analysis module is further configured to calculate an RSSI of the best matching access point relative to the target terminal and an RSSI of the access point that the target terminal previously matched with respect to the target terminal. a difference between the two; determining whether the difference is greater than or equal to a preset field strength difference;

The upper-level network module is further configured to: when the difference is greater than or equal to the preset field strength difference, send an allowable probe command to the best-matched access point; when the difference is less than the When the field strength difference is preset, the permission detection instruction is sent to the access point that is matched by the target terminal.

Optionally, the upper-level network module is further configured to send a prohibition detection instruction to the access point that is matched by the target terminal for the previous time, for the previously matched access point to be based on the received prohibition detection instruction. The information of the target terminal is deleted from the allowed probe list of the previously matched access point.

Optionally, the central control device of the wireless local area network matching access point further includes a probe information link list module, configured to sequentially press the plurality of access points according to the RSSI of each access point relative to the target terminal. Ranking the strong and weak, and updating to the probe information list corresponding to the target terminal of the central control device;

The matching analysis module is further configured to select an access point corresponding to the strongest RSSI as the best matching access point from the probe information list corresponding to the target terminal of the central control device.

An embodiment of the present invention further provides an access point for wireless local area network matching, including:

a lower-level network module, configured to receive a probe request sent by the target terminal;

a medium-level network module, configured to send a probe request of the target terminal to a central control device, where the central control device obtains a field strength RSSI of a current access point relative to the target terminal according to the probe request, and The central control device determines, according to the RSSI, whether to send an allowable probe command to the current access point;

Allowing the probe list module to be configured to add the information of the target terminal to the permission of the current access point when the intermediate network module receives the permission detection instruction issued by the central control device Detect in the linked list.

Optionally, the WLAN-matched access point further includes a field strength filtering module, configured to obtain a field strength RSSI of the current access point relative to the target terminal according to the probe request, and determine whether the RSSI is Greater than or equal to the preset threshold;

The intermediate network module is further configured to: when the RSSI is greater than or equal to the preset threshold, send a probe request of the target terminal to the central control device, where the central control device obtains the current request according to the probe request a field strength RSSI of the access point relative to the target terminal, and the central control device determines, according to the RSSI, whether to send an allowable probe instruction to the current access point;

The field strength filtering module is further configured to discard the probe request when the RSSI is less than the preset threshold.

Optionally, the allowable probe list module is further configured to: when the intermediate network module receives the prohibition detection instruction sent by the central control device, the information of the target terminal is allowed to be detected from the current access point. Deleted in the linked list.

Optionally, the allowable probe list module is further configured to: allow the probe list at the current access point according to the probe request of the target terminal received this time or the probe request of the target terminal received next time. Finding whether there is information about the target terminal;

The subordinate network module is further configured to: if the information of the target terminal exists in the allowed probe list of the current access point, reply the probe response to the target terminal; if not in the allowable probe list of the current access point If the information of the target terminal exists, the probe response is rejected to the target terminal.

Optionally, the access point matched by the WLAN further includes a hiding module, configured to delete a service set identifier SSID in a beacon frame of the current access point, to hide the beacon frame, and add the SSID Go to the probe response.

The solution of the embodiment of the present invention realizes that the central control device obtains the field strength of multiple access points relative to the target terminal according to the detection request of the target terminal reported by each access point, and the access point corresponding to the strongest field strength As the best matching access point, the best matching access point is controlled to be associated with the target terminal, so that the target terminal can smoothly access the WLAN system, effectively improving the efficiency of the terminal accessing the WLAN system, and ensuring that the target terminal is in the WLAN system. The stability of data transmission.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a flowchart of a method for implementing a wireless local area network matching access point by a central control device in Embodiment 1;

2 is a flow chart of a method for implementing a wireless local area network matching access point by a central control device in Embodiment 2;

3 is a flowchart of a method for implementing a wireless local area network matching access point by a central control device in Embodiment 3;

4 is a flow chart of a method for implementing a wireless local area network matching access point by a central control device in Embodiment 4;

5 is a flowchart of a method for implementing an access point of a wireless local area network by an access point in Embodiment 5;

6 is a flowchart of a method for implementing an access point of a wireless local area network by an access point in Embodiment 6;

7 is a flowchart of a method for implementing an access point of a wireless local area network by an access point in Embodiment 7;

8 is a flowchart of a method for implementing an WLAN to match an access point by an access point in Embodiment 8;

9 is a flowchart of a method for implementing an WLAN to match an access point by an access point in Embodiment 9;

10 is a block diagram showing a central control device for a wireless local area network matching access point in Embodiment 10;

11 is a block diagram showing a central control device for a wireless local area network matching access point in Embodiment 11;

12 is a schematic block diagram of a wireless local area network matched access point in Embodiment 12;

13 is a schematic block diagram of a wireless local area network matched access point in Embodiment 13;

14 is a schematic block diagram of a wireless local area network matched access point in Embodiment 14;

FIG. 15 is a diagram showing communication between a central control device, an access point, and a target terminal according to an embodiment of the present invention; intention.

The implementation, functional features and advantages of the embodiments of the present invention will be further described with reference to the accompanying drawings.

Preferred embodiment of the invention

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Embodiment 1

A central control device implements a method for matching an access point in a wireless local area network, and the flow thereof is as shown in FIG. The method for matching an access point in a wireless local area network mentioned in this embodiment includes:

Step S110: The central control device acquires a probe request from a target terminal that is reported by multiple access points.

This embodiment is directed to a WLAN system of a wireless local area network, where the WLAN system includes a plurality of access points (APs), usually tens to hundreds. The target terminal (ie, STA) that needs to access the network is a terminal with a WLAN function, and may be a computer with a wireless network card or a smart device with a WiFi module, such as a mobile phone, a PAD, or the like. In order to enable the target terminal to smoothly access the WLAN system and to stably download and upload the service, the embodiment adds a central control device, which is set to decide which AP the target terminal that enters the WLAN system should access. The hardware carrier where the central control device is located may be a special server, or a small AC (Access Controller or Wireless Access Point Controller, access controller, ie, a wireless controller), or a primary AP in the local area network, or a local area network. switch. Optionally, the hardware carrier of the central control device is required to be close to the AP on the group network, for example, a Layer 2 networking.

This embodiment is applicable to the case where a single or multiple STAs access the WLAN system. For example, as shown in Figure 15, when the target terminal enters the WLAN system and reaches the range covered by each access point AP1, AP2, AP3, and AP4, the target terminal periodically connects to each other. The inbound sends a probe request. The plurality of access points report the detected probe request sent by the same target terminal to the central control device, and the central control device determines the AP accessed by the target terminal according to the information about the probe request reported by the multiple access points.

Step S120: Obtain a field strength of each access point relative to the target terminal according to the probe request. RSSI;

In the probe request from the target terminal reported by the access point, the field strength RSSI of the access point relative to the target terminal may be extracted. Since the location of each access point is different, the distance from the target terminal is different, and If there are multiple factors such as the number of STAs that the access point has been associated with, the proportion of long-distance STAs, and the current network signal, the field strength of each access point relative to the target terminal will be different, and the target terminal sends a probe to the access point. The request also contains signal strength information, and the field strength of each access point relative to the target terminal can be obtained according to the probe request.

Step S130, selecting an access point corresponding to the strongest RSSI as the best matching access point;

In order to ensure that the target terminal smoothly accesses the WLAN network and obtains a stable network signal, the central control device controls the RSSI strongest access point to communicate with the target terminal, that is, selects the RSSI with the largest intensity value among the obtained RSSIs, and The access point corresponding to the strongest RSSI serves as the best matching access point. For example, in Figure 15, the access point corresponding to the strongest RSSI is AP3, and AP3 is used as the best matching access point.

Step S140: The permission detection instruction is sent to the best matching access point, and the best matching access point adds the information of the target terminal to the allowed detection list of the best matching access point according to the received allowed detection instruction.

The central control device delivers an allowable probe command to the best matching access point (such as AP3 in FIG. 15), and the allowable probe command includes wireless network card port information of the target terminal. If the situation is that multiple STAs access the WLAN system, the central control device encapsulates the wireless network card port information of the plurality of target terminals in a plurality of allowed detection instructions, and respectively sends the allowed detection instructions corresponding to each target terminal. The best matching access point for each target terminal. The best matching access point adds the information of the target terminal to the allowed probe list after receiving the allowed probe command, and the AP only sends the probe request sent by the STA in the allowable probe list to the STA. The probe response is returned, and the probe response is refused to be returned after receiving the probe request sent by the STA that is not allowed in the probe list. In this way, the AP associated with the STA is the best matching access point selected by the central control device, and the best matching access point is the strongest access point relative to the STA, and can make the target terminal Smooth connection to the WLAN system and ensure the stability of the data transmission of the target terminal in the WLAN system.

In this embodiment, the central control device obtains the field strength of each access point relative to the target terminal according to the detection request of the target terminal reported by the multiple access points, and uses the access point corresponding to the strongest field strength as The best matching access point is controlled to associate the best matching access point with the target terminal, so that the target terminal can smoothly access the WLAN system, effectively improving the efficiency of the terminal accessing the WLAN system, and ensuring that the target terminal is in the WLAN system. The stability of data transmission.

Embodiment 2

A central control device implements a method for matching an access point in a wireless local area network, and the flow thereof is shown in FIG. 2. This embodiment includes all the steps in the first embodiment shown in FIG. 1. Before step S140, the method further includes:

Step S151, calculating a difference between an RSSI of the best matching access point relative to the target terminal and an RSSI of the previous matching target point of the target terminal with respect to the target terminal;

Step S152, it is determined whether the difference is greater than or equal to the preset field strength difference; if yes, step S140 is performed; if not, step S153 is performed;

Step S153: The permission detection instruction is sent to the access point that the target terminal matches the previous time.

In this embodiment, the field strength of the access point is affected by various factors such as the distance from the target terminal, the number of associated STAs, and the proportion of the remote STA, and the RSSI of the access point relative to the target terminal. It may not be constant. The current access point may not be the best matching access point when the target terminal sends the probe request one time. When the target terminal sends the probe request this time, the distance is shortened, the number of associated STAs is reduced, or the far-distance STA is reduced. A small factor causes the RSSI of the current access point to be increased relative to the target terminal. The current access point has the largest RSSI relative to other access points, and the current access point is converted into the best matching access point. However, when the RSSI of each access point changes frequently, the best matching access point changes frequently, causing the target terminal to switch back and forth between multiple access points, which will affect the stability of the network and cause a ping-pong effect. In order to avoid this phenomenon, this embodiment presets a preset field strength difference, when the difference between the RSSI of the best matching access point and the RSSI of the previous matching access point reaches the preset field strength. When the difference is made, the central control device will allow the probe command to be sent to the best matching access point of the current time, allowing the best matching access point to send the probe response to the target terminal; otherwise, the central control device is still forwarded once. The matching access point sends an allowable probe command, and the previously matched access point sends a probe response to the target terminal.

Optionally, since the information of the target terminal is already stored in the allowed probe list of the previous matching access point, the access point returns a probe response for the probe request sent by the STA in the probe list, so if this time When the difference between the RSSI of the best matching access point and the RSSI of the previous matching access point is less than the preset field strength difference, the central control device may no longer match the previous access. The point sends an allowable probe command. By default, the previously matched access point continues to be the associated access point of the target terminal, and the previously matched access point sends a probe response to the target terminal.

In this embodiment, the RSSI of the best matching access point is compared with the RSSI of the previous matching access point, and when the difference between the two reaches the preset field strength difference, the central control device allows the target terminal to switch the access point. It effectively avoids frequent switching of access points and further ensures the stability of the WLAN system.

Embodiment 3

A central control device implements a method for matching an access point in a wireless local area network, and the flow thereof is shown in FIG. This embodiment includes all the steps in the second embodiment shown in FIG. 2, and after step S140, the method further includes:

Step S160: Sending a forbidden detection instruction to the access point that is matched by the target terminal for the previous time, for the access point of the previous matching to perform the detection of the information of the target terminal from the previous matching access point according to the received prohibition detection instruction. Deleted in the linked list.

If the central control device of this embodiment has selected a new best matching access point to associate with the target terminal, the previous matching access point no longer needs to reply the probe response to the target terminal, but because of the previously matched access point The information of the target terminal is already stored in the probe list, and the access point returns a probe response for the probe request sent by the STA in the probe list. Therefore, the central control device sends a prohibition probe command to the previous matching access point. The matched access point deletes the information of the target terminal from the allowed probe list. When the previously matched access point receives the probe request sent by the target terminal, the information of the target terminal does not exist in the probe list. The previously matched access point will no longer send a probe response to the target terminal. In this way, the target terminal is only associated with the best matching access point allocated by the central control device, and does not access other access points, thereby preventing the target terminal from connecting with other weaker access points and failing to connect smoothly. The network is unstable after entering the WLAN system or after access.

Embodiment 4

A central control device implements a method for matching an access point in a wireless local area network, and the flow thereof is shown in FIG. This embodiment includes all the steps in the first embodiment shown in FIG. 1. After step S120, the method further includes:

Step S170, sequentially ordering the multiple access points according to the RSSI strength of each access point with respect to the target terminal, and updating to the detection information of the central control device corresponding to the target terminal. In the linked list;

Wherein, step S130 includes:

Step S131: Select an access point corresponding to the strongest RSSI as the best matching access point from the probe information list corresponding to the target terminal of the central control device.

The central control device of the embodiment is pre-configured with a probe information link table of the STA. Each node in the probe information link table stores key information of one STA, one node corresponds to an information storage area of a certain STA, and the link header of the probe information link table points The information storage area finds a corresponding information storage area according to key information of the STA. The information storage area of the STA includes the probe information queue of the STA, the matching AP information specified by the central control device, the associated AP information, the time when the probe request was last reported, the STA association status, and the time associated with the STA and the AP. For example, the probe information of the target terminal is used as an example, and the probe information queue of the target terminal detection information list includes information of a plurality of APs. The APs have reported the probe request of the target terminal, and the APs in the probe information queue are reported according to the report. RSSI is arranged in descending order. When a new AP reports a probe request of the target terminal to the central control device, the central control device inserts the information of the AP into the probe information queue corresponding to the target terminal according to the RSSI size. When the AP information reported in the probe information list already exists, the central control device updates the order of the AP in the probe information queue according to the strength of the RSSI corresponding to the AP. If the number of records in the probe information queue is limited, the AP information with the weakest RSSI is deleted. When the central control device searches for the best matching access point, the information storage area corresponding to the target terminal is found according to the key information of the target terminal, and the AP information with the largest RSSI is obtained from the probe information queue of the STA in the information storage area. The AP corresponding to the strongest RSSI serves as the best matching access point.

Optionally, the STA's probe information list may further include a best matching AP information corresponding to the STA selected by the central control device, AP information associated with the STA, and a time when the STA last reported the probe request, according to the STA. When the last time the probe request is reported, the central control device can determine which AP information in the probe information queue of the STA has not been updated for a long time, and periodically delete the AP information that has not been updated for a long time. The STA's probe information list may also include an association status of the STA and a moment of association with an AP, and the association status may include associated, unassociated, and associated. The information of each AP is also recorded in the probe information queue, including the physical address (Medium/Media Access Control, MAC address) of the AP, the IP address, the network card number, the time when the AP last reported the probe request, and the RSSI reported by the AP last time. And the average value of RSSI recently reported.

The central control device of the embodiment updates the order of each AP in the probe information list of the target terminal according to the RSSI strength of the access point, and obtains the AP corresponding to the strongest RSSI from the probe information link list as the best matching AP, and controls the best. The matching access point is associated with the target terminal, so that the target terminal can smoothly access the WLAN system, effectively improving the efficiency of the terminal accessing the WLAN system, and ensuring the stability of the data transmission of the target terminal in the WLAN system.

Embodiment 5

A method for an access point to implement a wireless local area network matching access point, the flow of which is shown in FIG. 5. The method for matching an access point in a wireless local area network mentioned in this embodiment includes:

Step S210: The current access point receives the probe request sent by the target terminal.

In this embodiment, each AP in the WLAN system can receive the probe request sent by multiple STAs in a period of time, and each STA can periodically send probe requests to the same AP periodically, each time. The STA can send probe requests to different APs for a period of time. For example, an AS (that is, the target terminal in this embodiment) in the WLAN system sends a probe request to an AP (that is, the current access point in this embodiment). The central control device periodically sends some broadcast or multicast message to the AP in the WLAN system, and each AP receives the control of the central control device after receiving the broadcast or multicast message. After receiving the probe request sent by the target terminal, the current access point does not immediately reply to the probe response, but sends the probe request of the target terminal to the central control device. If the central control device is abnormal, the broadcast or multicast message will not be sent to each AP. Each AP is no longer controlled by the central controller, but responds to all target terminals that send probe requests in a conventional manner.

Step S220, the probe request of the target terminal is sent to the central control device, and the central control device obtains the field strength RSSI of the current access point with respect to the target terminal according to the probe request, and the central control device determines whether to connect to the current device according to the RSSI. The inbound transmission allows the probe instruction;

The current access point sends the probe request of the target terminal to the central control device. The probe request mainly includes the key information of the target terminal and the field strength RSSI of the current access point relative to the target terminal. The central control device determines, according to the RSSI size of the current access point relative to the target terminal, whether the RSSI of the current access point is the RSSI with the largest intensity value, and if the RSSI with the highest intensity value determines that the current access point is the target terminal. Preferably, the central control device sends an allowable probe command to the current access point, where the allowable probe command includes the wireless network card port information of the target terminal; if it is not the RSSI with the largest intensity value, the central control device does not access the current access point. The point is sent to allow the probe command.

In step S230, when the permission detection instruction issued by the central control device is received, the information of the target terminal is added to the allowed detection list of the current access point.

After receiving the permission detection command sent by the central control device, the current access point adds the information of the target terminal to the allowed probe list, and the current access point only receives the probe request sent by the STA in the allowable probe list. The probe response is returned to the STA, and the current access point refuses to return a probe response to the STA after receiving the probe request sent by the STA in the allowable probe list. In this way, the AP associated with the STA is the best matching access point selected by the central control device, and the best matching access point is the strongest access point relative to the current STA, and can make the target terminal Smooth connection to the WLAN system and ensure the stability of the data transmission of the target terminal in the WLAN system.

The access point of the embodiment actively reports the probe request of the target terminal to the central control device, and the central control device determines whether the current access point is the best matching access point according to the RSSI obtained by the probe request, and is at the current access point. When the access point is best matched, the permission detection command is sent to the current access point, and the current access point is associated with the target terminal, so that the target terminal can smoothly access the WLAN system, thereby effectively improving the efficiency of the terminal accessing the WLAN system. And ensure the stability of the data transmission of the target terminal in the WLAN system.

Embodiment 6

A method for an access point to implement a wireless local area network matching access point, the flow of which is shown in FIG. 6. This embodiment includes all the steps in the fifth embodiment shown in FIG. 5, and further includes: before step S220:

Step S241, obtaining a field strength RSSI of the current access point relative to the target terminal according to the probe request;

Step S242, it is determined whether the RSSI is greater than or equal to the preset threshold; if yes, step S220 is performed; if not, step S243 is performed;

In step S243, the probe request is discarded.

In this embodiment, the central control device selects the access point corresponding to the strongest RSSI as the best matching access point according to the strength of the RSSI when searching for the best matching access point. Therefore, each access point is advanced. The RSSI threshold is set, and the weaker probe request is directly filtered by the preset threshold and is not reported to the central control device. As a result, the report reported to the central control device by each access point is reduced. The number of texts is beneficial to reduce the processing load of the central control device and improve the processing efficiency of the central control device.

Example 7

A method for an access point to implement a wireless local area network matching access point, the flow of which is shown in FIG. This embodiment includes all the steps in the fifth embodiment shown in FIG. 5, and after step S220, the method further includes:

Step S250: When receiving the prohibition detection instruction issued by the central control device, the information of the target terminal is deleted from the allowed detection list of the current access point.

If the current access point in this embodiment has been used as the best matching access point in the previous matching, the information of the target terminal is stored in the allowed probe list, and if the current access point is sent to the central control device this time. The RSSI strength corresponding to the probe request is small, and the central control device selects a new best matching access point to associate with the target terminal, and the current access point no longer needs to reply the probe response to the target terminal, and the central control device accesses the current access. The point sends a forbidden detection command, and the current access point deletes the information of the target terminal from the allowed probe list. When the current access point receives the probe request sent by the target terminal, the target terminal is not allowed to exist in the probe list. Information, the current access point will no longer send a probe response to the target terminal. In this way, the target terminal is only associated with the best matching access point allocated by the central control device, and does not access other access points, thereby preventing the target terminal from connecting with other weaker access points and failing to connect smoothly. The network is unstable after entering the WLAN system or after access.

Example eight

A method for an access point to implement a wireless local area network matching access point, the flow of which is shown in FIG. This embodiment includes all the steps in the fifth embodiment shown in FIG. 5, and after step S230, the method further includes:

Step S261, searching for the presence or absence of the information of the target terminal in the allowable probe list of the current access point according to the probe request of the target terminal or the probe request of the target terminal received next time; if yes, performing the step S262; if not, proceed to step S263;

Step S262, replying the probe response to the target terminal;

Step S263, refusing to reply the probe response to the target terminal.

After receiving the probe request of the target terminal, the current access point of the present embodiment reports the probe request to the central control device, and updates the information in the allowable probe list according to the instruction issued by the central control device. If the processing of the probe request and the update allows the detection of the linked list to be fast enough, the current access point can immediately query whether the target terminal is allowed to exist in the probe list after updating the allowable probe list, and after finding the target, The probe request replies to the target terminal with a probe response. If on The report detection request and the update allow the processing speed of the probe list to be slow, and the current access point returns the probe response to the target terminal after receiving the probe request sent by the target terminal for the next time. The access point in this embodiment only responds to the probe request sent by the STA in the probe list, so that the AP associated with the STA is the best matching access point selected by the central control device, and is not accessed. Other access points enable the target terminal to smoothly connect to the WLAN system and ensure the stability of data transmission of the target terminal in the WLAN system.

Example nine

A method for an access point to implement a wireless local area network matching access point, the flow of which is shown in FIG. This embodiment includes all the steps in the eighth embodiment shown in FIG. 8. Before step S210, the method further includes:

Step S271, deleting the service set identifier SSID in the beacon frame of the current access point, and hiding the beacon frame;

Before step S262, the method further includes:

In step S272, the SSID is added to the probe response.

The access point in this embodiment is controlled by the central control device, and the service set identifier SSID in the beacon frame Beacon is deleted in advance, and the beacon frame is hidden to prevent the STA from scanning the SSID of the current access point, thereby affecting the central control device. Match control. When the central control device specifies that the current access point is the best matching AP of the target terminal, the current access point adds the SSID to the probe response and replies the probe response to the target terminal. When the central control device is abnormal, each access point is no longer controlled by the central control device, and each AP returns to the mode of the traditional AP, no longer hides the beacon frame, and responds to the probe request sent by any STA. In this embodiment, by hiding the beacon frame, the STA is prevented from scanning too many unnecessary APs, and the STA that enters the WLAN system only views the AP with the strongest signal, thereby preventing the STA from accessing the AP with weak signal, so that the STA can be successfully performed. Connect to the WLAN system and ensure the stability of the STA's data transmission in the WLAN system.

Example ten

A central control device for a wireless local area network matching access point, the structure of which is shown in FIG. The central control device 100 for the wireless local area network matching access point mentioned in this embodiment includes:

The upper-level network module 110 is configured to acquire a probe request from a target terminal that is reported by multiple access points;

The field strength analysis module 120 is configured to obtain a field strength RSSI of each access point relative to the target terminal according to the probe request;

The matching analysis module 130 is configured to select an access point corresponding to the strongest RSSI as the best matching access point;

The upper-level network module 110 is further configured to: send an allowable probe command to the best-matched access point, where the best-matched access point adds the information of the target terminal to the best-matched access point according to the received allowable probe command. Allow detection in the linked list.

This embodiment is directed to a WLAN system of a wireless local area network, where the WLAN system includes a plurality of access points (APs), usually tens to hundreds. The target terminal (ie, STA) that needs to access the network is a terminal with a WLAN function, and may be a computer with a wireless network card or a smart device with a WiFi module, such as a mobile phone, a PAD, or the like. In order to enable the target terminal to smoothly access the WLAN system and to stably download and upload the service, the embodiment adds a central control device for determining which AP the target terminal entering the WLAN system should access. The hardware carrier where the central control device is located may be a special server, or a small AC (Access Controller or Wireless Access Point Controller, access controller, ie, a wireless controller), or a primary AP in the local area network, or a local area network. switch. On the group network, the hardware carrier of the central control device is required to be as close as possible to the AP, for example, a Layer 2 network.

This embodiment is applicable to the case where a single or multiple STAs access the WLAN system. For example, as shown in Figure 15, when the target terminal enters the WLAN system and reaches the range covered by each access point AP1, AP2, AP3, and AP4, the target terminal periodically connects to each other. The inbound sends a probe request. Each access point reports the received probe request sent by the same target terminal to the central control device, and the central control device determines the AP accessed by the target terminal according to the information about the probe request reported by each access point.

In the probe request of the target terminal reported by the access point, the field strength RSSI of the access point relative to the target terminal may be extracted. Since the location of each access point is different, the distance from the target terminal is different, and The number of STAs associated with the access point, the proportion of long-distance STAs, and the current network signal will affect the field strength of each access point relative to the target terminal, and the probe request sent by the target terminal to the access point. The signal strength information is also included, and the field strength of each access point relative to the target terminal can be obtained according to the probe request.

In order to ensure that the target terminal smoothly accesses the WLAN network and obtains a stable network signal, the central The control device controls the access point with the strongest RSSI to communicate with the target terminal, that is, selects the RSSI with the largest intensity value among the obtained RSSIs, and uses the access point corresponding to the strongest RSSI as the best matching access point. For example, in Figure 15, the access point corresponding to the strongest RSSI is AP3, and AP3 is used as the best matching access point.

The central control device delivers an allowable probe command to the best matching access point (such as AP3 in FIG. 15), and the allowable probe command includes wireless network card port information of the target terminal. If the situation is that multiple STAs are connected to the WLAN system, the central control device encapsulates the wireless network card port information of the plurality of target terminals in the plurality of allowed detection instructions, and respectively sends the allowed detection instructions corresponding to the target terminals respectively. The best matching access point corresponding to each target terminal. The best matching access point adds the information of the target terminal to the allowed probe list after receiving the allowed probe command, and the AP only returns the probe to the STA after receiving the probe request sent by the STA in the allowable probe list. In response, the AP refuses to return a probe response to the probe request sent by the STA in the allowable probe list. In this way, the AP associated with the STA is the best matching access point selected by the central control device, and the best matching access point is the strongest access point relative to the current STA, and can make the target terminal Smooth connection to the WLAN system and ensure the stability of the data transmission of the target terminal in the WLAN system.

In this embodiment, the central control device obtains the field strength of each access point relative to the target terminal according to the probe request of the target terminal reported by each access point, and uses the access point corresponding to the strongest field strength as the best matching access. The point is controlled to associate the best matching access point with the target terminal, so that the target terminal can smoothly access the WLAN system, effectively improving the efficiency of the terminal accessing the WLAN system, and ensuring the stability of the data transmission of the target terminal in the WLAN system. .

Optionally, the matching analysis module 130 is further configured to calculate a difference between an RSSI of the best matching access point relative to the target terminal and an RSSI of the previous matching target point of the target terminal with respect to the target terminal; Whether it is greater than or equal to the preset field strength difference;

The upper-level network module 110 is further configured to: when the difference is greater than or equal to the preset field strength difference, issue an allowable detection instruction to the best matching access point; and when the difference is less than the preset field strength difference, to the target terminal The previous matching access point issues an allowable probe command.

In this embodiment, since the field strength of the access point is affected by various factors such as the distance from the target terminal, the number of associated STAs, and the proportion of the remote STA, the access point is relative to the target. The RSSI of the terminal may not be constant. The current access point may not be the best matching access point when the target terminal sends the probe request one time. When the target terminal sends the probe request this time, the distance is shortened, the number of associated STAs is reduced, or the far-distance STA is reduced. A small factor causes the RSSI of the current access point to be increased relative to the target terminal. The current access point has the largest RSSI relative to other access points, and the current access point is converted into the best matching access point. However, when the RSSI of each access point changes frequently, the best matching access point changes frequently, causing the target terminal to switch back and forth between multiple access points, which will affect the stability of the network and cause a ping-pong effect. In order to avoid this phenomenon, this embodiment presets a preset field strength difference, when the difference between the RSSI of the best matching access point and the RSSI of the previous matching access point reaches the preset field strength. When the difference is made, the central control device will allow the probe command to be sent to the best matching access point of the current time, allowing the best matching access point to send the probe response to the target terminal; otherwise, the central control device is still forwarded once. The matching access point sends an allowable probe command, and the previously matched access point sends a probe response to the target terminal.

Optionally, since the information of the target terminal is already stored in the allowed probe list of the previous matching access point, the access point returns a probe response for the probe request sent by the STA in the probe list, so if this time When the difference between the RSSI of the best matching access point and the RSSI of the previous matching access point is less than the preset field strength difference, the central control device may not send the permission detecting instruction to the access point that matches the previous one. The previously matched access point continues to be the associated access point of the target terminal, and the previously matched access point sends a probe response to the target terminal.

Optionally, the upper-level network module 110 is further configured to send a prohibition detection instruction to the access point that is matched by the target terminal, and the access point of the previous matching is used to forward the information of the target terminal according to the received prohibition detection instruction. A matching access point is allowed to be deleted from the linked list.

If the central control device of this embodiment has selected a new best matching access point to associate with the target terminal, the previous matching access point no longer needs to reply the probe response to the target terminal, but because of the previously matched access point The information of the target terminal is already stored in the probe list, and the access point returns a probe response for the probe request sent by the STA in the probe list. Therefore, the central control device sends a prohibition probe command to the previous matching access point. The matching access point will end the target The information of the terminal is deleted from the allowed probe list. When the previously matched access point receives the probe request sent by the target terminal, the previously matched access point does not exist because the information of the target terminal does not exist in the probe list. The probe response is sent to the target terminal. In this way, the target terminal is only associated with the best matching access point allocated by the central control device, and does not access other access points, thereby preventing the target terminal from connecting with other weaker access points and failing to connect smoothly. The network is unstable after entering the WLAN system or after access.

Embodiment 11

A central control device for a wireless local area network matching access point, the structure of which is shown in FIG. This embodiment includes all the modules in the tenth embodiment shown in FIG. 10, and further includes a probe information link list module 140, which is configured to sequentially sequence multiple access points according to the RSSI of each access point relative to the target terminal. Sorting and updating to the probe information list of the central control device corresponding to the target terminal;

The matching analysis module 130 is further configured to select an access point corresponding to the strongest RSSI as the best matching access point from the probe information list corresponding to the target terminal of the central control device.

The central control device of the embodiment is pre-configured with a probe information link table of the STA. Each node in the probe information link table stores key information of one STA, one node corresponds to an information storage area of a certain STA, and the link header of the probe information link table points The information storage area finds a corresponding information storage area according to key information of the STA. The information storage area of the STA includes the probe information queue of the STA, the matching AP information specified by the central control device, the associated AP information, the time when the probe request was last reported, the STA association status, and the time associated with the STA and the AP. For example, the probe information of the target terminal is used as an example, and the probe information queue of the target terminal detection information list includes information of a plurality of APs. The APs have reported the probe request of the target terminal, and the APs in the probe information queue are reported according to the report. RSSI is arranged in descending order. When a new AP reports a probe request of the target terminal to the central control device, the central control device inserts the information of the AP into the probe information queue corresponding to the target terminal according to the RSSI size. When the AP information reported in the probe information list already exists, the central control device updates the order of the AP in the probe information queue according to the strength of the RSSI corresponding to the AP. If the number of records in the probe information queue is limited, the AP information with the weakest RSSI is deleted. When the central control device searches for the best matching access point, the information storage area corresponding to the target terminal is found according to the key information of the target terminal, and the AP information with the largest RSSI is obtained from the detection information queue of the information storage area, which is the strongest. The AP corresponding to the RSSI serves as the best matching access point.

Optionally, the STA information list of the STA may further include a best matching AP information corresponding to the STA selected by the central control device, AP information that the STA has associated, and a time when the STA last reported the probe request. According to the time when the STA last reported the probe request, the central control device can determine which AP information in the probe information queue of the STA is not updated for a long time, and periodically delete the AP information that has not been updated for a long time. The STA's probe information list may also include an association status of the STA and a moment of association with an AP, and the association status may include associated, unassociated, and associated. The information of each AP is also recorded in the probe information queue, including the physical address (Medium/Media Access Control, MAC address) of the AP, the IP address, the network card number, the time when the AP last reported the probe request, and the RSSI reported by the AP last time. And the average value of RSSI recently reported.

Example twelve

A wireless local area network matching access point, the structure of which is shown in FIG. The wireless local area network matching access point 200 mentioned in this embodiment includes:

The lower-level network module 210 is configured to receive a probe request sent by the target terminal;

The intermediate network module 220 is configured to send the probe request of the target terminal to the central control device, where the central control device obtains the field strength RSSI of the current access point relative to the target terminal according to the probe request, and is determined by the central control device according to the RSSI. Whether to send an allowable probe instruction to the current access point;

The detection of the linked list module 230 is configured to add the information of the target terminal to the allowed probe list of the current access point when the intermediate network module 220 receives the allowable probe command issued by the central control device.

In this embodiment, each AP in the WLAN system can receive the probe request sent by multiple STAs in a period of time, and each STA can periodically send probe requests to the same AP periodically, each time. The STA can send probe requests to different APs for a period of time. Or one of the STAs in the WLAN system (ie, the target terminal in this embodiment) An AP (that is, the current access point in this embodiment) sends a probe request as an example. The central control device periodically sends some broadcast or multicast message to the AP in the WLAN system, and each AP receives the control of the central control device after receiving the broadcast or multicast message. After receiving the probe request sent by the target terminal, the current access point does not immediately reply to the probe response, but the probe request of the target terminal is sent to the central control device. If the central control device is abnormal, the broadcast or multicast message will not be sent to each AP. Each AP is no longer controlled by the central controller, but responds to all target terminals that send probe requests in a conventional manner.

The current access point sends the probe request of the target terminal to the central control device. The probe request mainly includes the key information of the target terminal and the field strength RSSI of the current access point relative to the target terminal. The central control device determines, according to the RSSI size of the current access point relative to the target terminal, whether the RSSI of the current access point is the RSSI with the largest intensity value, and if so, the current access point is the best matching access point of the target terminal. The central control device sends an allowable probe command to the current access point, where the allowable probe command includes the wireless network card port information of the target terminal; otherwise, the central control device does not send the allowable probe command to the current access point.

After receiving the permission detection command sent by the central control device, the current access point adds the information of the target terminal to the allowed probe list, and the current access point only receives the probe request sent by the STA in the allowable probe list. The probe response is returned to the STA, and the probe response is refused to be returned after receiving the probe request sent by the STA that is not allowed in the probe list. In this way, the AP associated with the STA is the best matching access point selected by the central control device, and the best matching access point is the strongest access point relative to the current STA, and can make the target terminal Smooth connection to the WLAN system and ensure the stability of the data transmission of the target terminal in the WLAN system.

Example thirteen

A wireless local area network matching access point, the structure of which is shown in FIG. This embodiment includes a diagram All the modules in the twelfth embodiment shown in FIG. 12 further include a field strength filtering module 240 configured to obtain a field strength RSSI of the current access point relative to the target terminal according to the probe request; and determine whether the RSSI is greater than or equal to the preset gate. Limit value

The intermediate network module 220 is further configured to: when the RSSI is greater than or equal to the preset threshold, send the probe request of the target terminal to the central control device, where the central control device obtains the field of the current access point relative to the target terminal according to the probe request. Strong RSSI, and the central control device determines, according to the RSSI, whether to send an allowable probe command to the current access point;

The field strength filtering module 240 is further configured to discard the probe request when the RSSI is less than the preset threshold.

Optionally, the detection of the linked list module 230 is further configured to: when the intermediate network module 220 receives the prohibition detection instruction issued by the central control device, the information of the target terminal is deleted from the allowed detection list of the current access point.

Optionally, the probe list module 230 is further configured to: according to the probe request of the target terminal received this time or the probe request of the target terminal received next time, find the target in the allowable probe list of the current access point. Terminal information;

The lower-level network module 210 is further configured to: if the information of the target terminal exists in the allowed probe list of the current access point, reply the probe response to the target terminal; if the target terminal does not exist in the allowed probe list of the current access point , then refuse to reply to the target terminal with a probe response.

After receiving the probe request of the target terminal, the current access point of the present embodiment reports the probe request to the central control device, and updates the information in the allowable probe list according to the instruction issued by the central control device. If the processing of the probe request and the update allows the detection of the linked list to be fast enough, the current access point can immediately query whether the target terminal is allowed to exist in the probe list after updating the allowable probe list, and after finding the target, The probe request replies to the target terminal with a probe response. If the processing of the probe request and the update allows the detection of the linked list to be slow, the current access point returns the probe response to the target terminal after receiving the probe request sent by the target terminal for the next time. The access point in this embodiment only responds to the probe request sent by the STA in the probe list, so that the AP associated with the STA is the best matching access point selected by the central control device, and is not accessed. Other access points enable the target terminal to smoothly connect to the WLAN system and ensure the stability of data transmission of the target terminal in the WLAN system.

Embodiment 14

A wireless local area network matching access point, the structure of which is shown in FIG. This embodiment includes all the modules in the twelfth embodiment shown in FIG. 12, and further includes a hiding module 250 configured to delete the service set identifier SSID in the beacon frame of the current access point, hide the beacon frame, and add the SSID. Into the probe response.

The access point in this embodiment is controlled by the central control device, and the service set identifier SSID in the beacon frame Beacon is deleted in advance, and the beacon frame is hidden to prevent the STA from scanning the SSID of the current access point, thereby affecting the central control device. Match control. When the central control device specifies that the current access point is the best matching AP of the target terminal, the current access point adds the SSID to the probe response and replies the probe response to the target terminal. When the central control device is abnormal, each access point is no longer controlled by the central control device, and each AP returns to the mode of the traditional AP, no longer hides the beacon frame, and responds to the probe request sent by any STA. This embodiment prevents the STA from scanning too much unnecessary by hiding the beacon frame. The STA that enters the WLAN system only sees the AP with the strongest signal, and prevents the STA from accessing the AP with weak signal, so that the STA can successfully connect to the WLAN system and ensure the stability of STA transmission in the WLAN system.

Embodiment 14

The embodiment of the present invention further provides a computer readable storage medium, which stores program instructions, and when the program instructions are executed by the processor, can implement a wireless local area network according to any one of Embodiments 1 to 4 of the present invention. The method of matching the access point.

Example fifteen

The embodiment of the present invention further provides a computer readable storage medium, which stores program instructions, and when the program instructions are executed by the processor, can implement a wireless local area network provided by any one of Embodiments 5 to 9 of the present invention. The method of matching the access point.

One of ordinary skill in the art will appreciate that all or a portion of the steps of the above-described embodiments can be implemented using a computer program flow, which can be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Alternatively, all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.

The devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.

When each device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium. The above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Industrial applicability

The embodiment of the invention realizes that the central control device obtains the field strength of each access point relative to the target terminal according to the detection request of the target terminal reported by the multiple access points, and uses the access point corresponding to the strongest field strength as The best matching access point is controlled to associate the best matching access point with the target terminal, so that the target terminal can smoothly access the WLAN system, effectively improving the efficiency of the terminal accessing the WLAN system, and ensuring that the target terminal is in the WLAN system. The stability of data transmission.

Claims

A method for matching an access point in a wireless local area network includes:

The central control device acquires the probe request from the target terminal reported by the multiple access points;

Obtaining, according to the probe request, a field strength RSSI of each access point relative to the target terminal;

Select the access point corresponding to the strongest RSSI as the best matching access point;

And sending an allowable probe command to the best matching access point, where the best matching access point adds information of the target terminal to the best matching access point according to the received allowable probe command. Allow detection in the linked list.
The method of claim 1, wherein the method further comprises: before delivering the allowable probe command to the best matching access point, the method further comprising:

Calculating a difference between an RSSI of the best matching access point relative to the target terminal and an RSSI of a previous matching target point of the target terminal with respect to the target terminal;

Determining whether the difference is greater than or equal to a preset field strength difference;

If the difference is greater than or equal to the preset field strength difference, performing a step of issuing an allowable probe command to the best matching access point;

If the difference is less than the preset field strength difference, the permission detection instruction is sent to the access point that the target terminal previously matched.
The method of claim 2, wherein the method further comprises: after the step of transmitting the allowable probe command to the best matching access point, the method further comprising:

And sending, by the access point that is matched by the target terminal, a prohibition detection instruction, where the previously matched access point, according to the received prohibition detection instruction, information of the target terminal from the previous matching The access point's allowed probe list is deleted.
The method for matching an access point in a wireless local area network according to any one of claims 1 to 3, wherein after the step of obtaining a field strength RSSI of each access point with respect to the target terminal according to the probe request The method further includes:

And the plurality of access points are sequentially followed by the RSSI of each access point relative to the target terminal. Sorting the strengths and weaknesses, and updating to the probe information list of the central control device corresponding to the target terminal;

The access point corresponding to the strongest RSSI is selected as the best matching access point, including:

An access point corresponding to the strongest RSSI is selected as the best matching access point from the probe information list corresponding to the target terminal of the central control device.
A method for matching an access point in a wireless local area network includes:

The current access point receives the probe request sent by the target terminal;

Sending the probe request of the target terminal to the central control device, where the central control device obtains the field strength RSSI of the current access point with respect to the target terminal according to the probe request, and is controlled by the central control device according to the The RSSI determines whether an allowable probe command is sent to the current access point;

When the permission detection instruction issued by the central control device is received, the information of the target terminal is added to the allowed detection list of the current access point.
The method of claim 5, wherein the method further comprises: before the step of transmitting the probe request of the target terminal to the central control device, the method further comprising:

Obtaining a field strength RSSI of the current access point relative to the target terminal according to the probe request;

Determining whether the RSSI is greater than or equal to a preset threshold;

If the RSSI is greater than or equal to a preset threshold, performing the step of transmitting the probe request of the target terminal to the central control device;

If the RSSI is less than a preset threshold, the probe request is discarded.
The method for matching an access point in a wireless local area network according to claim 5, wherein after the step of transmitting the probe request of the target terminal to the central control device, the method further comprises:

When the prohibition detection instruction sent by the central control device is received, the information of the target terminal is deleted from the allowed detection list of the current access point.
The method for matching an access point in a wireless local area network according to claim 5 or 7, wherein after the step of adding information of the target terminal to the allowable probe list of the current access point, the method further includes:

Determining, according to the probe request of the target terminal that is received this time or the probe request of the target terminal that is received next time, whether the information of the target terminal exists in the allowable probe list of the current access point;

If the information of the target terminal exists in the allowed probe list of the current access point, the probe response is replied to the target terminal;

If the information of the target terminal does not exist in the allowed probe list of the current access point, the probe response is refused to be returned to the target terminal.
A method of matching an access point in a wireless local area network according to claim 8, wherein

Before the step of the current access point receiving the probe request sent by the target terminal, the method further includes:

Deleting the service set identifier SSID in the beacon frame of the current access point, and hiding the beacon frame;

Before the step of replying the probe response to the target terminal, the method further includes:

The SSID is added to the probe response.
A central control device for a wireless local area network matching access point, comprising:

The upper-level network module is configured to acquire a probe request from the target terminal that is reported by multiple access points;

a field strength analysis module, configured to obtain a field strength RSSI of each access point relative to the target terminal according to the probe request;

The matching analysis module is configured to select an access point corresponding to the strongest RSSI as the best matching access point;

The upper-level network module is further configured to: send an allowable probe command to the best-matching access point, where the best-matching access point adds the information of the target terminal to the received probe command according to the received The best match access point is allowed in the probe list.
A central control device for a wireless local area network matching access point according to claim 10, wherein said matching analysis module is further configured to calculate an RSSI of said best matching access point relative to said target terminal and said a difference between the RSSI of the target terminal that was previously matched with respect to the RSSI of the target terminal; determining whether the difference is greater than or equal to a preset field strength difference;

The upper network module is further configured to: when the difference is greater than or equal to the preset field strength difference And sending an allowable probe command to the best matching access point; when the difference is less than the preset field strength difference, sending an allowable probe command to the access point that is previously matched by the target terminal .
The central control device of the wireless local area network matching access point according to claim 11, wherein the upper-level network module is further configured to issue a prohibition detection instruction to the access point of the target terminal that was previously matched, The previously matched access point deletes the information of the target terminal from the allowed probe list of the previously matched access point according to the received prohibition detection instruction.
A central control device for a wireless local area network matching access point according to any of claims 10 to 12, further comprising a probe information linked list module, configured to sequentially associate said plurality of access points with respect to said target for each access point Sorting the strengths and weaknesses of the RSSI of the terminal, and updating to the probe information list of the central control device corresponding to the target terminal;

The matching analysis module is further configured to select an access point corresponding to the strongest RSSI as the best matching access point from the probe information list corresponding to the target terminal of the central control device.
A wireless local area network matching access point, including:

a lower-level network module, configured to receive a probe request sent by the target terminal;

a medium-level network module, configured to send a probe request of the target terminal to a central control device, where the central control device obtains a field strength RSSI of a current access point relative to the target terminal according to the probe request, and The central control device determines, according to the RSSI, whether to send an allowable probe command to the current access point;

The probe list module is configured to be configured to add the information of the target terminal to the allowed probe list of the current access point when the intermediate network module receives the allowable probe command sent by the central control device.
The WLAN-matched access point of claim 14, further comprising a field strength filtering module, configured to obtain a field strength RSSI of the current access point relative to the target terminal according to the probe request; Whether the RSSI is greater than or equal to a preset threshold;

The intermediate network module is further configured to: when the RSSI is greater than or equal to the preset threshold, send a probe request of the target terminal to the central control device, where the central control device is configured according to The probe request obtains a field strength RSSI of the current access point relative to the target terminal, and the central control device determines, according to the RSSI, whether to send an allowable probe instruction to the current access point;

The field strength filtering module is further configured to discard the probe request when the RSSI is less than the preset threshold.
The WLAN-matched access point according to claim 14, wherein the allowable probe list module is further configured to: when the intermediate network module receives the prohibition detection instruction issued by the central control device, The information of the target terminal is deleted from the allowed probe list of the current access point.
The WLAN-matched access point according to claim 14 or 16, wherein the allowable probe list module is further configured to: according to the probe request of the target terminal received this time or the next received The probe request of the target terminal searches for the information of the target terminal in the allowable probe list of the current access point;

The subordinate network module is further configured to: if the information of the target terminal exists in the allowed probe list of the current access point, reply the probe response to the target terminal; if not in the allowable probe list of the current access point If the information of the target terminal exists, the probe response is rejected to the target terminal.
The access point for wireless local area network matching according to claim 17, further comprising a hiding module, configured to delete a service set identifier SSID in a beacon frame of the current access point, to hide the beacon frame; and to set the SSID Added to the probe response.
A computer readable storage medium storing program instructions that, when executed by a processor, implement the method of any of claims 1-4.
A computer readable storage medium storing program instructions that, when executed by a processor, implement the method of any of claims 5-9.