CN112492585B - Method for connecting wireless terminal with wireless local area network and network system - Google Patents

Method for connecting wireless terminal with wireless local area network and network system Download PDF

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CN112492585B
CN112492585B CN202011270542.2A CN202011270542A CN112492585B CN 112492585 B CN112492585 B CN 112492585B CN 202011270542 A CN202011270542 A CN 202011270542A CN 112492585 B CN112492585 B CN 112492585B
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access
wireless terminal
wireless
signal strength
key information
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CN112492585A (en
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祝肖锋
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Hangzhou DPTech Technologies Co Ltd
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Hangzhou DPTech Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/02—Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present specification provides a method for connecting a wireless terminal to a wireless local area network, which comprises the steps of configuring the same BSSID for all APs in the same local area network, selecting a proper AP as an access AP of the wireless terminal by an AP control device after the wireless terminal enters a service area of the wireless local area network, and storing the key information by the AP control device after the wireless terminal and the access AP negotiate a key based on the BSSID. When the access AP monitors that the signal intensity of the wireless terminal is weaker and weaker, the access AP informs the AP control equipment, after the AP control equipment receives the notification, a proper AP is selected again to serve as the access AP of the wireless terminal and a secret key is issued, and the new access AP and the old AP have the same BSSID and secret key information, so that the new access AP successfully replaces the old access AP to serve the wireless terminal.

Description

Method for connecting wireless terminal with wireless local area network and network system
Technical Field
The present disclosure relates to the field of computer network technologies, and in particular, to a method and a network system for connecting a wireless terminal to a wireless local area network.
Background
The wlan includes a plurality of Wireless Access Points (APs), and a Wireless terminal (STA) is usually connected to the wlan by connecting to an AP of the wlan.
After the wireless terminal enters the service area of the wireless local area network, the signal strength of the AP of the wireless local area network can be scanned, and the AP with the strongest signal strength is selected and the connection is established.
The wireless terminal will usually move in the service area, and if the signal strength of the currently connected AP is found to be weak, the currently connected AP will be disconnected, and then the AP with the strongest signal strength is reselected and the connection is established to re-access the wireless local area network.
However, the wireless terminal re-accesses the wireless lan by switching the AP, which may cause a delay and affect the user experience of the wireless terminal.
Disclosure of Invention
In order to overcome the problem of time delay caused by re-accessing the wireless local area network, the present specification provides a method and a network system for connecting a wireless terminal to the wireless local area network.
The present specification provides a method for a wireless terminal to connect to a wireless local area network, which configures a same Basic Service Set Identifier (BSSID) for a plurality of wireless access points AP included in the wireless local area network, and the method includes:
after entering a service area of the wireless local area network, the wireless terminal broadcasts a request wireless frame for connecting the wireless local area network to the wireless local area network;
monitoring that each AP of the request wireless frame determines the signal intensity of the wireless terminal and sending the signal intensity to AP control equipment of the wireless local area network;
the AP control equipment determines an AP with the transmitted signal strength greater than the normal service strength as an access AP according to the received signal strength;
the AP control equipment, the access AP and the wireless terminal negotiate and store key information based on the BSSID; the access AP interacts with the wireless terminal based on the key information;
after the access AP predicts that the signal strength of the wireless terminal will not meet the normal service strength, monitoring that each other AP of an interactive wireless frame between the wireless terminal and the access AP determines the signal strength of the wireless terminal and sends the signal strength to the AP control equipment;
and the AP control equipment determines one other AP with the transmitted signal strength greater than the normal service strength as the access AP again according to the received signal strength, and then sends the key information to the access AP.
The present specification also provides a network system including a wireless local area network and a wireless terminal; the wireless local area network comprises AP control equipment and a plurality of APs;
configuring the same basic service set identifier BSSID for a plurality of wireless access points AP included in a wireless local area network in advance;
the wireless terminal broadcasts a connection request to the wireless local area network after entering a service area of the wireless local area network; negotiating and storing key information with the AP control device and the access AP based on the BSSID;
each AP executes, if the request wireless frame is monitored, the signal intensity of the wireless terminal is determined, and the signal intensity is sent to AP control equipment of the wireless local area network; under the condition of being determined as the access AP for the first time, if the key information issued by the AP control equipment is received, performing communication interaction with the wireless terminal based on the key information; under the condition that the AP is determined to be accessed for the first time, if the key information issued by the AP control equipment is not received, the key information is negotiated and stored with the AP control equipment and the wireless terminal based on the BSSID, and communication interaction is carried out with the wireless terminal based on the key information;
the AP control equipment determines an AP with the transmitted signal strength greater than the normal service strength as an access AP according to the received signal strength; negotiating and storing key information with the wireless terminal and the access AP based on the BSSID; and according to the received signal strength, re-determining one other AP with the transmitted signal strength greater than the normal service strength as the access AP, and then sending the key information to the access AP.
In the technical solution of the embodiment of this specification, first, all APs in the same lan are configured with the same BSSID, and after a wireless terminal enters a service area of the wireless lan, an AP control device selects an appropriate AP as an access AP of the wireless terminal, and after the wireless terminal and the access AP negotiate a key based on the BSSID, the AP control device stores the key information. When the access AP monitors that the signal intensity of the wireless terminal is weaker and weaker, the access AP informs the AP control equipment, after the AP control equipment receives the notification, a proper AP is selected again to serve as the access AP of the wireless terminal and a secret key is issued, and the new access AP and the old AP have the same BSSID and secret key information, so that the new access AP successfully replaces the old access AP to serve the wireless terminal.
Through the technical scheme of the embodiment of the specification, a plurality of APs have the same BSSID, and the APs can be identified as the same AP when the wireless terminal is identified, so that when the AP and the wireless terminal are switched by the AP control equipment to carry out communication interaction, the AP has the same BSSID and the same key, the wireless terminal does not need to disconnect, scan the AP, negotiate the key and the like, the wireless terminal directly switches the AP under the condition of no change in the interaction process, the service interruption time of the wireless terminal in the process of switching the AP is greatly reduced, and better experience is brought to a user of the wireless terminal.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the specification.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present specification and together with the description, serve to explain the principles of the specification.
Fig. 1 is a flowchart illustrating a wireless terminal accessing a wireless local area network according to the present disclosure.
Fig. 2 is a flow chart illustrating interaction among parties when a wireless terminal accesses a wireless local area network according to the present specification.
Fig. 3 is a schematic diagram of a network system structure shown in this specification.
Detailed Description
After the wireless terminal enters the wireless local area network, if the wireless local area network is accessed, an AP needs to be selected first, then a key is negotiated among the wireless terminal, the selected AP and the AP control equipment, and then the wireless terminal and the AP can interact based on the negotiated key, which is equivalent to establishing connection. The AP control device is also called a Wireless Access Point Controller (AC).
The specific process of selecting the AP by the wireless terminal is as follows:
the wireless terminal scans beacon wireless frames broadcasted by surrounding APs, the beacon wireless frames broadcasted by the APs carry BBSIDs (BSSIDs of the APs are different) of the APs and signal strength indications, and the wireless terminal actively selects one AP with the strongest signal strength according to the received signal strength of each AP.
The specific process of negotiating the key is as follows:
the wireless terminal sends an identity authentication request to the selected AP; after receiving the identity authentication request, the AP reports the identity authentication request to a wireless controller AC; if the AC judges that the identity authentication is passed, generating a basic element of the key according to the wireless terminal identifier, the AC identifier and the AP identifier BSSID, and issuing the basic element to the AP; after the AP receives the reply of the AC, the AP responds to the identity authentication request of the wireless terminal according to the reply of the AC; the AP negotiates a key with the wireless terminal based on the key infrastructure element.
The BSSID is an identifier of a Basic Service Set (BSS) managed by the AP, and is generally configured as a Media Access Control Address (MAC) of the AP, and when the wireless terminal negotiates a secret key in a communication interaction process with the AP, the BSSID is used for calculating the secret key.
In practical applications, the wireless terminal may move in a service area of the wireless lan, and may move from the service area of the currently connected AP to a service area of another AP, at this time, the wireless terminal may find that the signal strength of the currently connected AP is weakened, and when the signal strength is lower than a value, the wireless terminal determines that roaming is required, that is, the wireless terminal determines that the AP needs to be switched, and accesses the local area network through another AP. When the wireless terminal switches the AP, it needs to disconnect from the currently connected AP (i.e. no longer interact with the currently connected AP), select a new AP again, and then negotiate a key with the selected new AP, which is equivalent to establishing a connection with the new AP.
In this implementation, it takes time for the wireless terminal to disconnect from the current AP, it takes time for scanning beacon radio frames of surrounding APs when an AP is selected, and it also takes time for negotiating a key with a new AP.
In one or more embodiments of the present description, all APs of the wireless local area network may be configured with the same BSSID. When a wireless terminal enters a service area of a wireless local area network, a request wireless frame for requesting access to the wireless local area network is broadcasted, an AP of the request wireless frame is monitored, the signal intensity of the wireless terminal is obtained according to the request wireless frame and reported to an AP control device of the wireless local area network, the AP control device judges which signal intensities meet normal service intensity (namely, a preset signal intensity threshold value is obtained, if the signal intensity of the normal service is met, if the signal intensity of the normal service is greater than the threshold value), one of the signal intensities is selected as an access AP of the wireless terminal, the access AP is informed, the access AP responds to the wireless terminal broadcast connection request wireless frame after receiving the notification, and then the wireless terminal, the access AP and the AP control device conduct key negotiation and save, so that connection between the access AP and the wireless terminal is established.
Since the BSSIDs of all the APs are the same, the key information required is the same regardless of which AP establishes a connection with the wireless terminal, which means that when an AP needs to be switched, it is not necessary to perform key negotiation again based on the BSSID of the newly selected AP.
When the wireless terminal moves from the service area of the access AP to the service area of another AP, the access AP discovers that the signal intensity of the currently received interactive wireless frame (namely the wireless frames mutually transmitted in the communication process) is weaker and weaker, when the signal intensity is weaker and lower than the normal service intensity (namely the signal intensity of the wireless terminal is predicted to be incapable of meeting the normal service intensity), the access AP informs the AP control equipment that the wireless terminal is about to roam, after receiving the notification, the AP control equipment receives the signal intensity of the wireless terminal transmitted by other APs again, selects a new AP meeting the normal service intensity as the access AP according to the received signal intensity, and transmits the key information to the new access AP, and the new access AP performs communication interaction with the wireless terminal based on the key.
The AP control device selects a new AP meeting the normal service intensity as an access AP, namely, the old access AP is informed not to perform communication interaction with the wireless terminal any more, and the new AP is informed to perform communication interaction with the wireless terminal as the access AP.
Through one or more embodiments of the present disclosure, on one hand, when the wireless terminal moves from the service area of the access AP to the service area of another AP, the access AP predicts that the wireless terminal will need to roam, actively reports the information that the wireless terminal will need to roam to the AP control device, and then the AP control device actively switches the AP to which the wireless terminal is connected. On the other hand, a plurality of APs have the same BSSID, and when the wireless terminal identifies, the plurality of APs are identified as the same AP, so that when the AP is switched by the AP control device to perform communication interaction with the wireless terminal, because the APs have the same BSSID and key, the wireless terminal, the access AP, and the AP control device do not need to perform key negotiation any more, and the wireless terminal directly switches the AP without change in the interaction process. Therefore, according to one or more embodiments of the present disclosure, the service interruption time of the wireless terminal when the AP is switched is greatly reduced, and a better experience is provided for a user of the wireless terminal.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present specification. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the specification, as detailed in the appended claims.
The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the description. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, the first information may also be referred to as second information, and similarly, the second information may also be referred to as first information, without departing from the scope of the present specification. The word "if," as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination," depending on the context.
The following provides a detailed description of examples of the present specification.
In the embodiment described herein, it is necessary to configure the same BSSID for all APs in the wireless local area network, and the AP control device is connected to each AP. The wireless local area network described herein may be a subnet in the wireless local area network, or may be a wireless local area network without a subnet.
It should be noted that the AP control device is connected to each AP, and is responsible for managing and configuring all APs in the wireless lan, issuing configuration parameters and policies in a unified manner, integrating a certificate issuing center and multiple access identity authentications, providing multiple security encryption policies, and ensuring user access and internet access security of the wireless lan.
As shown in fig. 1, fig. 1 is a flowchart illustrating a wireless terminal connecting to a wireless local area network according to an exemplary embodiment, and includes the following steps:
step S101, the wireless terminal broadcasts a request wireless frame to the wireless local area network.
As shown in step 101 of fig. 2, after the wireless terminal enters the service area of the wireless lan, a request wireless frame for requesting connection to the wireless lan may be broadcast.
The service area of the wlan means that each AP in the wlan has a serviceable area (i.e., serviceable range), and the service area of the wlan is the union of the service areas of all APs.
In practical applications, the Request radio frame for connecting to the wlan may be a Probe Request (Probe Request) frame.
Step S102, monitoring each AP of the requested wireless frame, and sending the signal intensity of the wireless terminal to the AP control equipment.
The location of the wireless terminal in the wlan is uncertain, and some APs far away from the wireless terminal cannot monitor the request wireless frame, so that each AP monitoring the request wireless frame (each AP receiving the request wireless frame) determines the signal strength of the wireless terminal according to the information indicating the signal strength carried in the request wireless frame, and then sends the signal strength of the wireless terminal to the AP control device, as shown in step 102 of fig. 2.
If there are multiple wireless terminals, when the AP sends the signal strength of the wireless terminal to the AP control device, the AP control device also needs to send the terminal identifier (such as the MAC address of the wireless terminal) of the wireless terminal to the AP control device, so that the AP control device can determine which wireless terminal the received signal strength is.
Step S103, the AP control device determines an AP with the signal intensity larger than the normal service intensity as an access AP.
As shown in steps 103, 104, 105 of fig. 2, the AP control device selects an AP from the APs with signal strength greater than the normal service strength according to the received signal strength, determines the AP as an access AP, needs to notify the access AP after the AP control device determines to access the AP, and replies to the requested wireless frame of the wireless terminal after the access AP receives the notification from the AP control device.
Wherein, the normal service signal strength is flexibly set according to the actual deployment condition of the AP, and one reference threshold value is-70 dB milliwatt.
In practical applications, when the AP control device selects one AP from the APs with the signal strength greater than the normal service strength, the AP with the largest signal strength is generally selected. If a plurality of wireless terminals exist, when the AP control device selects one AP from the APs with the signal strength greater than the normal service strength, the load condition of each AP may also be considered, that is, the AP with the least number of connected wireless terminals may be selected as the access AP.
And step S104, negotiating and storing key information based on BSSID between the AP control equipment, the access AP and the wireless terminal.
The steps 106, 107, 108 of fig. 2, the negotiating and storing the key between the AP controlling device, the access AP, and the wireless terminal include:
the wireless terminal sends an identity authentication request to the access AP; after receiving the identity authentication request, the access AP reports the identity authentication request to the AP control equipment; if the AP control equipment judges that the identity authentication is passed, generating basic elements of the key according to the wireless terminal identification, the identification of the AP control equipment and the identification BSSID of the AP, and issuing the basic elements to the AP; after the AP receives the reply of the AP control equipment, responding to the identity authentication request of the wireless terminal according to the reply of the AP control equipment; the access AP and the wireless terminal negotiate a key based on the key basic element and report to the AP control equipment.
The access AP carries out communication interaction with the wireless terminal based on the secret key information, and in the interaction process of the access AP and the wireless terminal, the wireless terminal sends an interactive wireless frame used for carrying out communication interaction with the access AP.
Step S105, the access AP predicts that the wireless terminal will roam, and each other AP monitoring the interactive wireless frame sends the signal intensity of the wireless terminal to the AP control equipment.
As shown in steps 111, 112, and 113 of fig. 2, the AP predicts that the wireless terminal will roam, that is, the AP detects that the signal strength of the wireless terminal gradually weakens during the communication interaction with the wireless terminal, and predicts that the wireless terminal will roam when the signal strength is lower than the normal service strength, at this time, the AP reports the information of the pre-roaming of the wireless terminal to the AP control device, and the AP control device receives the signal strength of the wireless terminal reported by other APs after receiving the information of the pre-roaming of the wireless terminal.
If the signal intensity gradually approaches the set normal service intensity, it indicates that the wireless terminal gradually leaves the service area of the access AP, and the wireless terminal is predicted to roam.
It should be noted that, in the communication interaction process between the wireless terminal and the access AP, the wireless terminal broadcasts an interactive wireless frame, and the access AP responds to the wireless terminal after receiving the interactive wireless frame. The interactive wireless frame carries information indicating the signal intensity of the wireless terminal, other APs which can monitor the interactive wireless frame determine the signal intensity of the wireless terminal according to the interactive wireless frame, and then the signal intensity is reported to the AP control equipment, and the signal intensity of the wireless terminal does not need to be reported to other APs which do not monitor the interactive wireless frame.
Other APs herein refer to other APs with respect to the access AP.
Step S106, the AP control device determines another AP with the signal intensity larger than the normal service intensity as the access AP again.
As shown in steps 114 and 115 of fig. 2, after the AP control device receives the signal strength of the wireless terminal sent by other APs, it selects a new AP with a signal strength greater than the normal service strength as an access AP according to the received signal strength, and informs the old access AP that it is not necessary to reply the interworking information frame of the wireless terminal.
In practical application, when the AP control device reselects an AP as an access AP from the APs with the signal strength greater than the normal service strength, the AP with the largest signal strength is generally selected. If a plurality of wireless terminals exist, when the AP control device reselects one AP as an access AP from the APs with the signal strength greater than the normal service strength, the load condition of each AP may also be considered, that is, the AP with the least number of connected wireless terminals may be selected as the access AP.
In one or more embodiments, when reselecting an access AP, the AP control device may calculate a difference between the signal strength of each other AP and the signal strength of the access AP, and select one other AP with the difference greater than a preset value as a new access AP.
And S107, the AP control equipment sends the key information to the access AP.
After determining the new AP, the AP control device needs to send the stored key to the new AP, and after receiving the key, the new AP replies to the wireless terminal based on the key information, so that the new AP inherits the task of the old AP and performs communication interaction with the wireless terminal, as shown in steps 117, 118, and 119 of fig. 2.
It should be noted that, in a practical situation, there may be a case where the wireless terminal leaves the service area of a certain AP and then enters the service area of the AP. When the wireless terminal enters the service area of the AP for the first time, the AP stores the key information, and when the wireless terminal enters the AP again, the AP stores the key information, so that the AP control equipment does not need to issue the key information again. Therefore, when issuing the key information, the AP control device may first determine whether the AP that wants to issue the key holds the key information, if so, the AP does not need to issue the key information, and if not, the AP issues the key information.
Further, in one or more embodiments, after step 103, that is, after the AP controlling device determines that one AP with a signal strength greater than a normal service is an access AP, the AP controlling device notifies each of the other APs to turn off the wireless frame monitoring function for the wireless terminal. In step 105, after receiving the information of pre-roaming of the wireless terminal sent by the access AP, the AP controlling device notifies each other AP to start a wireless frame monitoring function for the wireless terminal.
The wireless frame monitoring function is started, namely, the wireless frame sent by the wireless terminal is received, and the signal intensity of the wireless terminal is judged according to the wireless frame. The wireless frame monitoring function is turned off, that is, the wireless frame sent by the wireless terminal is not subjected to any processing judgment.
After the wireless frame monitoring function is started, the AP can periodically report the signal intensity of the wireless terminal to the AP control equipment.
In addition, in step 106, after the AP is determined to be accessed again, the AP control device notifies each other AP to turn off the wireless frame monitoring function for the wireless terminal, and when it is needed again that each other AP monitors the wireless frame of the wireless terminal, the AP control device notifies each other AP to turn on the wireless frame monitoring function for the wireless terminal again. Each other AP, as used herein, refers to each other AP with respect to the newly accessed AP, including the old accessed AP.
In practical applications, if the wireless terminal leaves the service area of the wireless lan or the wireless terminal requests to disconnect from the wireless lan, the AP control device and each AP storing the key information delete the key information. The wireless terminal requesting disconnection from the wireless local area network means that the wireless terminal sends a wireless frame requesting disconnection to the access AP. And after receiving the disconnection-requesting wireless frame, the access AP reports the disconnection information of the wireless terminal to the AP control equipment, and after receiving the disconnection information, the AP control equipment deletes the key information and informs each AP of deleting the key information corresponding to the wireless terminal.
Deleting the key information can reduce the storage burden of the AP control equipment on one hand, and prevent other equipment from forging the identity of the wireless terminal and preventing the key information from accessing the wireless local area network on the other hand, so that the wireless terminal can perform identity authentication each time the wireless terminal enters the service area of the wireless local area network.
The present specification also provides a network system, as shown in fig. 3, including a wireless local area network and a wireless terminal; the wireless local area network comprises AP control equipment and a plurality of APs;
configuring the same basic service set identifier BSSID for a plurality of wireless access points AP included in a wireless local area network in advance;
the wireless terminal broadcasts a connection request to the wireless local area network after entering a service area of the wireless local area network; negotiating and storing key information with the AP control device and the access AP based on the BSSID;
each AP executes, if the request wireless frame is monitored, the signal intensity of the wireless terminal is determined, and the signal intensity is sent to AP control equipment of the wireless local area network; under the condition of being determined as the access AP for the first time, if the key information issued by the AP control equipment is received, performing communication interaction with the wireless terminal based on the key information; under the condition that the AP is determined to be accessed for the first time, if the key information issued by the AP control equipment is not received, the key information is negotiated and stored with the AP control equipment and the wireless terminal based on the BSSID, and communication interaction is carried out with the wireless terminal based on the key information;
the AP control equipment determines an AP with the transmitted signal strength greater than the normal service strength as an access AP according to the received signal strength; negotiating and storing key information with the wireless terminal and the access AP based on the BSSID; and according to the received signal strength, re-determining one other AP with the transmitted signal strength greater than the normal service strength as the access AP, and then sending the key information to the access AP.
Accordingly, the present specification also provides an apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor is configured to the AP control apparatus or AP to perform any of the methods described above.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Other embodiments of the present description will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This specification is intended to cover any variations, uses, or adaptations of the specification following, in general, the principles of the specification and including such departures from the present disclosure as come within known or customary practice within the art to which the specification pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the specification being indicated by the following claims.
It will be understood that the present description is not limited to the precise arrangements described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present description is limited only by the appended claims.
The above description is only a preferred embodiment of the present disclosure, and should not be taken as limiting the present disclosure, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims (10)

1. A method for a wireless terminal to connect to a wireless local area network, wherein the same basic service set identifier BSSID is configured for a plurality of wireless access points AP comprised in the wireless local area network, the method comprising:
after entering a service area of the wireless local area network, the wireless terminal broadcasts a request wireless frame for connecting the wireless local area network to the wireless local area network;
monitoring that each AP of the request wireless frame determines the signal intensity of the wireless terminal and sending the signal intensity to AP control equipment of the wireless local area network;
the AP control equipment determines one AP with the transmitted signal strength greater than the normal service strength as an access AP according to each received signal strength;
the AP control equipment, the access AP and the wireless terminal negotiate and store key information based on the BSSID; the access AP performs communication interaction with the wireless terminal based on the key information;
after the access AP predicts that the signal strength of the wireless terminal will not meet the normal service strength, monitoring that the signal strength of the wireless terminal is determined by each other AP of an interactive wireless frame between the wireless terminal and the access AP and sending the signal strength to the AP control equipment; wherein the predicting that the signal strength of the wireless terminal will not meet the normal service strength comprises: detecting that the signal strength of the wireless terminal is gradually weakened and the signal strength is about to be lower than a normal service strength;
and the AP control equipment determines one other AP with the transmitted signal strength greater than the normal service strength as the access AP again according to the received signal strength, and then sends the key information to the access AP.
2. The method of claim 1,
the AP control device determines an AP with the transmitted signal strength greater than the normal service strength as an access AP according to the received signal strength, and the method comprises the following steps: the AP control equipment determines the AP with the maximum signal strength as an access AP according to the received signal strength, wherein the transmitted signal strength is greater than the normal service strength;
and/or
The AP controlling device re-determines, according to the received signal strength, one other AP whose transmitted signal strength is greater than the normal service strength as the access AP, and then issues the key information to the access AP, including: and the AP control equipment determines other APs with the signal strength greater than the normal service strength and the maximum signal strength as the access APs again according to the received signal strength, and then sends the key information to the access APs.
3. The method of claim 1, wherein, in the case of at least one other wireless terminal,
the AP control device determines an AP with the transmitted signal strength greater than the normal service strength as an access AP according to the received signal strength, and the method comprises the following steps: the AP control equipment determines the AP with the transmitted signal intensity larger than the normal service intensity and the least number of connected wireless terminals as an access AP according to the received signal intensity;
and/or
The AP controlling device re-determines, according to the received signal strength, one other AP whose transmitted signal strength is greater than the normal service strength as the access AP, and then issues the key information to the access AP, including: and the AP control equipment determines other APs with the transmitted signal strength greater than the normal service strength and the minimum number of connected wireless terminals as the access APs again according to the received signal strength, and then sends the key information to the access APs.
4. The method of claim 1, wherein the AP controlling device subsequently issuing the key information to the access AP comprises:
the AP control equipment transmits the key information to the access AP under the condition of determining that the key information is not stored in the access AP;
the method further comprises the following steps:
and the AP control equipment does not send the key information under the condition of determining that the access AP stores the key information.
5. The method of claim 1, further comprising:
the AP control equipment informs each other AP of closing a wireless frame monitoring function aiming at the wireless terminal after determining that one AP with the transmitted signal intensity larger than the normal service intensity is an access AP;
after the access AP predicts that the signal intensity of the wireless terminal will not meet the normal service intensity, the AP control equipment receives a prediction result sent by the access AP and informs each other AP of starting a wireless frame monitoring function aiming at the wireless terminal.
6. The method of claim 5, further comprising:
the AP control device notifies each other AP of turning off a wireless frame monitoring function for the wireless terminal after re-determining the access AP.
7. The method of claim 6, further comprising:
and if the terminal leaves the service area of the wireless local area network or the wireless terminal requests to be disconnected with the wireless local area network, the AP control equipment informs each other AP of starting a wireless frame monitoring function aiming at the wireless terminal.
8. The method of claim 1, further comprising:
and if the wireless terminal leaves the service area of the wireless local area network or the wireless terminal requests to be disconnected with the wireless local area network, the AP control equipment and each AP stored with the key information delete the key information.
9. A network system, comprising a wireless local area network and a wireless terminal; the wireless local area network comprises AP control equipment and a plurality of APs;
configuring the same basic service set identifier BSSID for a plurality of wireless access points AP included in a wireless local area network in advance;
the wireless terminal broadcasts a connection request to the wireless local area network after entering a service area of the wireless local area network; negotiating and storing key information with the AP control device and the access AP based on the BSSID;
each AP executes, if a request wireless frame is monitored, the signal intensity of the wireless terminal is determined, and the signal intensity is sent to AP control equipment of the wireless local area network; under the condition of being determined as the access AP for the first time, if the key information issued by the AP control equipment is received, performing communication interaction with the wireless terminal based on the key information; under the condition that the AP is determined to be accessed for the first time, if the key information issued by the AP control equipment is not received, the key information is negotiated and stored with the AP control equipment and the wireless terminal based on the BSSID, and communication interaction is carried out with the wireless terminal based on the key information;
the AP control equipment determines an AP with the transmitted signal strength greater than the normal service strength as an access AP according to the received signal strength; negotiating and storing key information with the wireless terminal and the access AP based on the BSSID; and according to the received signal strength, re-determining one other AP with the transmitted signal strength greater than the normal service strength as the access AP, and then sending the key information to the access AP.
10. The system of claim 9, further comprising:
the wireless terminal leaves the service area of the wireless local area network or requests to be disconnected with the wireless local area network;
the AP control equipment deletes the key information if determining that the wireless terminal leaves the service area of the wireless local area network or requests to be disconnected with the wireless local area network;
and if receiving an instruction of deleting the key information by the AP control equipment, deleting the key information by each AP with the key information.
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