WO2014194492A1

WO2014194492A1 - Access point selection method and device

Info

Publication number: WO2014194492A1
Application number: PCT/CN2013/076778
Authority: WO
Inventors: 王舜禹
Original assignee: 华为技术有限公司
Priority date: 2013-06-05
Filing date: 2013-06-05
Publication date: 2014-12-11
Also published as: CN104380809B; CN104380809A

Abstract

Embodiments of the present invention provide an access point (AP) selection method and device. The AP selection method of the present invention comprises: a centralized controller receiving status information sent by each AP, wherein the status information comprises load information about the AP that sends the status information; selecting at least one target AP that provides services for an STA according to the status information about each AP; sending a response message carrying a response policy to each AP, wherein the response policy is used to instruct the target AP to respond to an explorer frame broadcast by the STA and other APs not to respond to the explorer frame so that the STA selects a serving AP from the at least one target AP. The centralized controller according to embodiments of the present invention determines the target AP that provides wireless services for the STA according to the status information sent by each AP by responding to the explorer frame of the STA. Thus, the AP selection can be implemented in an optimal and efficient way.

Description

Access point selection method and device

Technical field

The embodiments of the present invention relate to communication technologies, and in particular, to a method and an apparatus for selecting an access point. Background technique

The wireless local area network (WLAN) of the carrier is to integrate the management functions of multiple access points (APs) to form a new network element, which is an access controller (Access Controller, Referred to as AC), the AC is used to centrally manage and configure thin APs in the WLAN to form a wireless network.

When a station (Station for short) needs to access the wireless network, the STA broadcasts the sounding frame. After receiving the sounding frame, the AP responds with a sounding response. After that, the STA can select the service AP according to the signal strength of the probe response replied by each AP to complete the authentication. The selected service AP initiates an association request, and the selected service AP returns an association response to the STA, and the STA can perform service interaction with the selected service AP after the association is completed. In the above network access process, the STA does not consider the load of the AP when the AP is selected. When the AP load is large, the communication performance is seriously affected. In order to solve the problem, in the prior art, after the STA initiates an association request to the selected serving AP, the AC determines the load condition of the selected serving AP to determine whether to respond to the STA, thereby implementing load balancing of the AP selection.

However, in the foregoing prior art, after the STA sends the association request to the AP to be associated, the STA needs to wait for the AC to perform the load balancing judgment, and increases the delay of the STA accessing the network, and the STA and the AC respectively select the service AP, so that the STA and the AC respectively select the service AP. The AP selection efficiency is not high; in addition, the AC only considers the load of the AP when selecting the service AP, so that the AP selection is not optimized enough. Summary of the invention

The embodiment of the invention provides a method and a device for selecting an access point, so as to solve the problem that the efficiency of AP selection is not high and the AP selection is not optimized, so as to achieve high efficiency and optimality of AP selection.

In a first aspect, an embodiment of the present invention provides a method for selecting an access point, including:

The centralized controller receives status information sent by at least one access point AP, and the status information packet The load information of the AP that sends the status information;

The centralized controller selects at least one target AP that provides wireless service for the workstation STA according to the status information of the at least one AP;

The centralized controller sends a response message carrying a response policy to the at least one AP, where the response policy is used to indicate that the at least one target AP responds to the probe frame broadcast by the STA, and other APs do not respond to the STA broadcast. The sounding frame, so that the STA selects a serving AP from the at least one target AP.

In a first possible implementation manner of the first aspect, the status information further includes quality information of a channel between the AP that sends the status information and the STA;

And the centralized controller, according to the status information of the at least one AP, selecting at least one target AP that provides the wireless service for the STA, including:

The centralized controller selects the at least one target AP that provides wireless service for the STA according to the load information of each AP in the at least one AP and the quality information of the channel between each AP and the STA.

According to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner, the status information is that the at least one AP after receiving the detection frame broadcast by the STA Sending to the centralized controller, or the at least one AP is periodically or event-triggered to the centralized controller.

According to the first aspect, any one of the first to the second possible implementation manners of the first aspect, in a third possible implementation manner, the centralized controller, according to status information of the at least one AP, After selecting at least one target AP that provides wireless service for the STA, the method further includes:

If the at least one target AP does not include the current serving AP, and the centralized controller determines that the STA does not switch the serving AP within the preset condition, sending an indication message indicating that the current serving AP sends the disassociation to the STA a message to trigger the STA to re-broadcast the sounding frame.

According to the first aspect, any one of the first to the third possible implementation manners of the first aspect, in a fourth possible implementation manner, after the centralized controller receives the status information sent by the at least one AP, Also includes:

Determining, by the centralized controller, whether an entry of the STA is stored, and if yes, updating an entry of the STA according to the status information;

If no, the entry of the STA is generated according to the status information; And storing the received status information corresponding to the STA;

And the centralized controller selects the at least one target AP that provides the wireless service for the STA according to the state information stored by the STA entry.

According to any one of the first to fourth possible implementation manners of the first aspect, in a fifth possible implementation, the centralized controller is selected to be provided by the STA according to status information of the at least one AP The target AP of the wireless service, including:

Determining, by the centralized controller, the AP to be selected according to quality information and a preset threshold of a channel between each AP and the STA in the at least one AP;

The centralized controller selects, as the at least one target AP, at least one AP with the smallest load among the candidate APs.

According to any one of the first to fifth possible implementation manners of the first aspect, in a sixth possible implementation, the quality information of the channel includes each AP in the at least one AP to the STA The signal strength information of the channel, or the uplink modulation and coding strategy MCS packet distribution information of each AP in the at least one AP.

In a second aspect, an embodiment of the present invention provides a method for selecting an access point, including:

The access point AP receives the response message that is sent by the centralized controller and carries the response policy, where the response message is sent by the centralized controller to the AP after receiving the status information sent by the AP, the response policy. ???said at least one target AP in the AP that receives the response message responds to the sounding frame broadcast by the workstation STA, and the other AP does not respond to the sounding frame broadcast by the STA; the at least one target AP is the centralized control The device is selected by the STA according to the status information sent by the at least one AP, where the status information includes the load information of the AP that sends the status information. If the AP has received the sounding frame broadcast by the STA, Determining, by the response policy, whether the at least one target AP includes the AP, and if so, responding to the probe frame, so that the STA selects a serving AP from the at least one target AP; if not, does not respond to the probe frame.

In a first possible implementation manner of the second aspect, the status information further includes quality information of a channel between the AP that sends the status information and the STA;

The at least one target AP is selected by the centralized controller for the STA according to the status information sent by the at least one AP, and includes: The at least one target AP is selected by the centralized controller according to load information of each AP in the at least one AP and quality information of a channel between each AP and the STA.

According to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner, before the receiving, by the AP, the response message that is sent by the centralized controller and carrying the response policy, the method further includes:

Sending, by the AP, the status information to the centralized controller after receiving the probe frame broadcast by the STA;

Alternatively, the AP periodically or evently sends the status information to the centralized controller.

According to the second aspect, the first to the second possible implementation manner of the second aspect, in a third possible implementation manner, the method further includes:

The AP receives the indication message sent by the centralized controller, and sends a disassociation message to the STA, to trigger the STA to re-broadcast the probe frame, where the indication message is that the centralized controller determines the at least one target AP. The current serving AP is not included, and is determined within a preset condition that the STA does not switch when the serving AP is switched.

According to the second aspect, the first to the third possible implementation manners of the second aspect, in a fourth possible implementation manner, after the AP receives the response message that is sent by the centralized controller and carries the response policy, Includes:

The AP establishes or updates a response policy of the STA according to the response policy.

According to the fourth possible implementation manner of the second aspect, in a fifth possible implementation manner, before the AP receives the response message that is sent by the centralized controller and carries the response policy, the method further includes: the AP receiving the The probe frame broadcast by the STA;

Determining, by the AP, a response policy of the STA, if not, sending the status information of the AP to the centralized controller, so that the centralized controller acquires status information of the AP, and determines the At least one target AP, and transmitting the response message carrying the response policy.

In a third aspect, an embodiment of the present invention provides a centralized controller, including:

a first receiving module, configured to receive status information sent by at least one access point AP, where the status information includes load information of an AP that sends the status information;

a processing module, configured to select, according to the status information received by the first receiving module, at least one target AP that provides wireless service for the workstation STA; a sending module, configured to send, according to the at least one target AP selected by the processing module, a response message carrying a response policy to the at least one AP, where the response policy is used to indicate that the at least one target AP responds to the STA The broadcast probe frame, the other AP does not respond to the probe frame broadcast by the STA, so that the STA selects a serving AP from the at least one target AP.

In a first possible implementation manner of the third aspect, the processing module is further configured to: if the status information further includes quality information of a channel between the AP that sends the status information and the STA, The load information of each AP in the at least one AP and the quality information of the channel between each AP and the STA are selected, and the at least one target AP that provides the wireless service to the STA is selected.

According to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner, the processing module is further configured to: select, according to status information of the at least one AP, After the at least one target AP of the wireless service, if the at least one target AP does not include the current serving AP, and determines that the STA does not switch the serving AP within a preset condition, sending an indication message indicating that the current serving AP is in the The STA sends a disassociation message to trigger the STA to re-broadcast the sounding frame.

According to the third aspect, the first to the second possible implementation manners of the third aspect, in a third possible implementation, the processing module is further configured to: after receiving the status information sent by the at least one AP, determine Whether the entry of the STA is stored, if yes, the entry of the STA is updated according to the status information, and if not, the entry of the STA is generated according to the status information; For storing the received status information corresponding to the STA, according to the status information stored in the entry of the STA, selecting the fourth aspect of the at least one target that provides the wireless service for the STA, the embodiment of the present invention provides a Access point devices, including:

a second receiving module, configured to receive a response message that is sent by the centralized controller and that carries the response policy, where the response message is sent by the centralized controller to the AP after receiving the status information sent by the access point AP, The response policy is used to indicate that at least one target AP in the AP that receives the response message responds to the probe frame broadcast by the workstation STA, and the other AP does not respond to the probe frame broadcast by the STA; the at least one target AP is The centralized controller is selected by the STA according to the status information sent by the at least one AP, where the status information includes load information of the AP that sends the status information.

a response module, configured to: if the probe frame broadcast by the STA has been received, according to the response policy Slightly determining whether the at least one target AP includes the AP, and if so, responding to the probe frame, so that the STA selects a serving AP from the at least one target AP; if not, does not respond to the probe frame.

In a first possible implementation manner of the fourth aspect, the status information further includes quality information of a channel between the AP that sends the status information and the STA;

The at least one target AP is selected by the centralized controller according to the status information sent by the at least one AP, and includes:

The at least one target AP is selected by the centralized controller according to load information of each AP in the at least one AP and quality information of a channel between each AP and the STA.

According to the fourth aspect or the first possible implementation manner of the fourth aspect, in a second possible implementation manner, the response module is further configured to:

Receiving the indication message sent by the centralized controller, and sending a disassociation message to the STA, to trigger the STA to re-broadcast the probe frame, where the indication message is that the centralized controller determines that the at least one target AP does not include the current The AP is served, and is determined to be sent when the STA does not switch the serving AP within a preset condition.

In a fifth aspect, an embodiment of the present invention provides a centralized controller, including a receiver, a processor, and a memory, where:

The receiver is configured to receive status information sent by at least one access point AP, where the status information includes load information of an AP that sends the status information;

The memory stores a set of program codes, and the processor calls the program code to: perform at least one target AP that provides wireless service for the workstation STA according to status information of the at least one AP, to the At least one AP sends a response message carrying a response policy, where the response policy is used to indicate that the at least one target AP responds to the probe frame broadcast by the STA, and the other AP does not respond to the probe frame broadcast by the STA; The STA selects a serving AP from the at least one target AP.

The memory is also used to store the response policy.

In a first possible implementation manner of the fifth aspect, the status information further includes quality information of a channel between the AP that sends the status information and the STA.

In a sixth aspect, an embodiment of the present invention provides an access point device, including:

a receiver, configured to receive a response message sent by the centralized controller and carrying a response policy, where The response message is sent by the centralized controller to the AP after receiving the status information sent by the access point AP, where the response policy is used to indicate that at least one target AP in the AP that receives the response message responds to the workstation. a probe frame broadcast by the STA, the other AP does not respond to the probe frame broadcast by the STA; the at least one target AP is selected by the centralized controller for the STA according to status information sent by at least one AP, the state The information includes load information of the AP that sends the status information;

a processor, configured to determine, according to the response policy, whether the at least one target AP includes the AP, if yes, responding to the probe frame, so that the STA is Selecting a service AP from the at least one target AP; if not, not responding to the probe frame.

In a first possible implementation manner of the sixth aspect, the status information further includes quality information of a channel between the AP that sends the status information and the STA.

The method and device for selecting an access point according to an embodiment of the present invention, the centralized controller determines, according to the status information sent by each AP, a target AP that provides a wireless service for the STA, in response to the probe frame of the STA, for the STA to select a service AP from the target APs. The optimality and efficiency of the AP selection are realized, the load balancing of the wireless network is ensured, and the problem that the AP selection efficiency is not high and the AP selection is not optimized is solved. At the same time, in this embodiment, since the AC is the control for the AP to respond to the sounding frame, the network access waiting time of the user is reduced as compared with the control of the AP response association request in the prior art. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a flowchart of Embodiment 1 of a method for selecting an access point according to the present invention;

2 is a flowchart of Embodiment 2 of a method for selecting an access point according to the present invention;

3 is a flowchart of Embodiment 3 of a method for selecting an access point according to the present invention;

4 is a flowchart of Embodiment 4 of a method for selecting an access point according to the present invention;

5 is a signaling flowchart of Embodiment 5 of a method for selecting an access point according to the present invention;

6 is a signaling flowchart of Embodiment 6 of a method for selecting an access point according to the present invention;

7 is a schematic structural diagram of Embodiment 1 of a centralized controller according to the present invention; 8 is a schematic structural diagram of Embodiment 1 of an AP device according to the present invention;

9 is a schematic structural diagram of Embodiment 2 of a centralized controller according to the present invention;

FIG. 10 is a schematic structural diagram of Embodiment 2 of an AP device according to the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a flowchart of Embodiment 1 of a method for selecting an access point according to the present invention. The method is applicable to access selection of a wireless network, and in particular, access selection of a wireless network based on AP load balancing. The method can be completed by the centralized controller and the AP, and does not have any requirements on the STA and the network protocol, and is completely controlled by the network side (such as AP and AC), and has high compatibility. The entity of the centralized controller is not limited to the AC, may be an independent server, or may be a specific AP, as long as the centralized control function for each AP can be implemented. At the same time, the wireless network is not limited to the operator's WLAN network, but may also be a typical WLAN network formed by fat APs. All of the following embodiments are described by taking the centralized controller as the AC and the wireless network as the WLAN network of the operator. As shown in Figure 1, the method can be performed as follows:

S101. The centralized controller receives status information sent by at least one AP, where the status information includes load information of an AP that sends the status information.

The load information is used to reflect the current load status of the AP that sends the status information, and may include one or any combination of the current usage duty ratio of the AP, the number of associated users, the number of concurrent users, and traffic.

Preferably, the status information may further include quality information of a channel between the AP that sends the status information and the STA. The quality information of the channel is used to reflect the quality of the communication channel between each AP and the STA in the at least one AP, and may include signal strength information of each AP in the at least one AP to the STA and/or the at least one AP. The uplink modulation and coding scheme (MCS) packet distribution information of each AP statistics.

Optionally, the status information may be that the at least one AP receives the broadcast of the STA. After the frame is sent to the centralized controller, the at least one AP may be sent to the centralized controller periodically or event-triggered, and no limitation is imposed here. The event triggering may be triggered by the set channel quality threshold. For example, if the serving AP determines that the channel quality of the STA is lower than the set threshold, the status information may be sent to the AC, for example, non-serving. The AP may send the status information to the AC when the channel quality of the STA is higher than the set threshold. The event triggering may also be triggered by the set data packet loss rate, but not limited thereto. For example, it can be set according to the actual situation.

S102. The centralized controller selects, according to the status information of the at least one AP, at least one target AP that provides a wireless service for the STA.

For example, the AC selects, according to the load information of each AP in the status information sent by the at least one AP, a plurality of APs with the smallest load as the at least one target AP, and the STA selects the serving AP from the at least one target AP according to the signal strength.

Preferably, the status information may further include quality information of a channel between the AP that sends the status information and the STA, that is, status information sent by the at least one AP received by the AC may further include a channel between each AP and the STA. For the quality information, the AC selects the target AP that provides the wireless service for the STA according to the load information of each AP in the at least one AP and the quality information of the channel between each AP and the STA. The selection process can be performed as follows:

method one

After the load threshold is set in advance, the AC processes the load information in the status information, and uses at least one AP whose load is less than the load threshold as the candidate AP. The AC selects the candidate AP based on the quality information of the channel. One or more APs with good channel quality as the at least one target APo

If the load of the AP is higher than the load threshold, the AC may not select the target AP, and may select one or more APs with less load as the at least one target AP according to the load information.

Alternatively, the AC may not set the load threshold, and directly select at least one AP with a small load as the candidate AP according to the load information of each AP, and then select one of the selected APs from the candidate AP according to the quality information of the channel or A plurality of APs serve as the at least one target AP.

Method Two

The centralized controller determines the candidate AP according to the quality information and the preset threshold of the channel between each AP and the STA in the at least one AP; the centralized controller selects the minimum load in the candidate AP. At least one AP is the at least one target AP. The advantage of this is that the AP with poor channel quality can be avoided as the target AP, which ensures the optimality of the target AP.

Specifically, the AC pre-sets a channel quality threshold, and processes the quality information of the channel in the status information, and the at least one AP whose channel quality is greater than the channel quality threshold is used as the candidate AP; One or more APs with low load are selected from the candidate APs as the at least one target AP.

If the channel quality of the AP is lower than the channel quality threshold, the AC may not select the target AP, and may select one or more APs with better channel quality as the at least one target AP according to the quality information of the channel.

Alternatively, the AC may not set the channel quality threshold, and select at least one AP with a high channel quality as the candidate AP according to the channel quality of each AP, and then select one or more of the selected APs from the candidate AP according to the load information. APs are the target APs.

The above two methods are only examples. The selection of the target AP can be flexibly specified according to requirements, such as statistical prediction based on historical data. There is no restriction here, as long as the target AP can be selected.

The at least one target AP may be one or more. If it is one, the STA may be directly associated with the target AP to establish or update a wireless connection. The advantage of this is that the STA can provide the most An excellent service AP does not require the STA to select the target AP, and improves the wireless network access efficiency. If there are multiple, the STA may be instructed to select a serving AP from the multiple target APs, that is, the STA is from multiple The optimized target AP selects the service AP autonomously, which improves the autonomy and flexibility of the STA.

S103. The centralized controller sends a response message carrying a response policy to the at least one AP, where the response policy is used to indicate that the at least one target AP responds to the probe frame broadcast by the STA, and the other AP does not respond to the probe frame broadcast by the STA, so that The STA selects a serving AP from the at least one target AP.

Specifically, after determining the at least one target AP, the AC generates a response policy, where the response policy is used to indicate that the target AP responds to the probe frame, that is, when receiving the probe frame broadcast by the STA, sending a probe response to the STA for the The STA selects the serving AP; the response policy is further used to indicate that the other AP does not respond to the probe frame, that is, does not send a probe response to the STA when receiving the probe frame broadcast by the STA. The other AP is in the AP that receives the status information on the AC. It is selected as an AP other than the target AP.

The AC sends the response policy to the at least one AP, and the at least one AP determines, according to the response policy, whether to respond to the probe frame of the STA, so that the STA selects a serving AP from the target AP to initiate an association request, thereby establishing with the target AP or Update your wireless connection. The updated wireless connection can include: roaming of the wireless network or re-association of the wireless connection.

If the STA has not established a wireless network before, or has disconnected from the wireless network, the STA selects a serving AP from at least one target AP to establish a wireless connection; if the STA has a serving AP at this time, the STA is at least A target AP selects a new serving AP to perform handover of the serving AP, and implements roaming or re-association of the wireless network.

In this embodiment, the centralized controller determines, according to the status information sent by each AP, a target AP that provides a wireless service for the STA, in response to the probe frame of the STA, for the STA to select a serving AP from the target APs, thereby achieving optimality of AP selection. And high efficiency, ensuring load balancing of the wireless network, solving the problem that the AP selection efficiency is not high and the AP selection is not optimized. In the embodiment, the AC is a control for the AP to respond to the sounding frame, and the network access waiting time of the user is reduced as compared with the control of the AP response association request in the prior art.

Optionally, the centralized controller, after selecting the at least one target AP that provides the wireless service for the STA, according to the status information of the at least one AP, may further include: if the at least one target AP does not include the current serving AP, and the centralized controller is If it is determined in the preset condition that the STA does not switch the serving AP, the sending indication message indicates that the current serving AP sends a disassociation message to the STA to trigger the STA to re-broadcast the sounding frame.

Specifically, the AC determines, according to the status information, whether the STA has established a wireless connection, and if yes, may select at least one target AP according to the status information of the at least one AP, and determine whether the selected at least one target AP includes the current one. The STA provides the AP for the wireless service. If yes, the AC may not generate the response policy. If not, the AC sets a preset condition for the STA to switch the service AP autonomously according to its own situation. If the STA does not perform the autonomous handover, the AC indicates that the AP that is currently providing the wireless service to the STA releases the association with the STA, to trigger the STA to re-broadcast the probe frame, and instructs the at least one target AP to respond to the probe frame. The preset condition may include, but is not limited to: a preset fixed time or a wireless medium channel quality. For example, the preset condition may be a preset time period, and after the time period, the STA has not performed autonomous switching, and the de-association is enforced; or the preset condition may be pre- If the wireless medium channel quality threshold, such as the signal quality threshold or the packet loss threshold, is lower than these thresholds, the STA does not perform autonomous handover, and the de-association is enforced. The advantage of this is that the AC can dynamically adjust the load of the wireless network, ensure the load balancing of the APs in the wireless network, and ensure that the APs that provide services are performance-optimized APs.

The following describes the embodiment from two scenarios:

Scenario 1: The STA does not currently establish a wireless connection.

Before the STA accesses the wireless network, the probe frame needs to be broadcast. After receiving the probe frame, the nearby AP does not directly return the probe response, but can send status information to the AC. The AC receives the status information sent by the AP, and the status information may be sent by the AP to the AC after receiving the detection frame sent by the STA.

The AC selects a target AP that provides wireless service for the STA according to the received status information, and generates a response policy. The response policy is consistent with the foregoing, and the selection process is similar to the foregoing, and details are not described herein again. The target AP may be one or multiple, and may be selected according to actual conditions.

The AC sends a response policy to the at least one AP, so that the selected target AP responds to the probe frame to indicate that the STA selects one of the target APs as the serving AP to establish a wireless connection.

Scenario 2: The STA has established a wireless connection.

When the STA is connected to the wireless network, the AC receives the status information sent by the at least one AP, and the status information may be sent to the AC periodically or by an event triggering.

The AC selects a target AP that provides wireless service for the STA according to the received status information, and generates a response policy. The response policy is consistent with the foregoing, and the selection process is similar to the foregoing, and details are not described herein again. The number of the target APs may be multiple. The advantage of this is that the AC can not predict the randomness of the STAs in the mobile in real time, so that the STA can quickly switch to the target AP according to its own system mechanism, and provide multiple selectable targets. AP, to prevent the interruption of network access switching caused by unsynchronized updates, improve network access compatibility and fault tolerance.

The AC sends a response policy to the at least one AP, so that the target AP sends a probe response to the STA when receiving the probe frame broadcast by the STA, to indicate that the STA selects a target AP from the target AP as a new service AP. To perform service AP switching in the wireless network, Complete roaming or re-association in the wireless network.

2 is a flowchart of Embodiment 2 of a method for selecting an access point according to the present invention. On the basis of the foregoing embodiment, after S101, the method may further include: determining, by the centralized controller, whether an entry of the STA is stored, If yes, the entry of the STA is updated according to the status information; if not, the entry of the STA is generated according to the status information; the entry of the STA is used to store the received status information of the corresponding STA; The 102 may include: the centralized controller selecting the at least one target AP that provides the wireless service for the STA according to the state information stored by the STA entry. The method can be applied to the case where the STA is ready to access the wireless network, and can also be applied to the case where the STA has access to the network. As shown in FIG. 2, the method can be performed according to the following process:

5201, the centralized controller determines whether the entry of the STA is stored, if yes, updating the entry of the STA according to the status information; if not, generating an entry of the STA according to the status information; The item is used to store the received status information of the corresponding STA.

Specifically, after receiving the status information sent by the at least one AP, the AC may first perform a search from the list of the locally stored STAs to determine whether the entry of the STA already exists in the list, and if yes, according to the received The status information is updated to the STA entry, so that the AC selects the at least one target AP according to the latest STA entry; if not, the new STA entry is created according to the status information, so that the AC receives the The STA directly updates the entry when the STA is related to the status information, and the AC selects the at least one target AP according to the latest STA entry.

The STA entry list is created by the AC and stored locally, so that the AC can summarize the received status information, which facilitates the selection of the target AP. The STA entry list may include multiple STA entries. The entry of each STA may include status information of each AP that is received related to the STA.

S202. The centralized controller selects the at least one target AP that provides the wireless service for the STA according to the state information stored by the STA entry.

For example, after waiting for a certain period of time, the AC determines the APs as the target APs by detecting and determining the quality information of the load information and the channel from the STA entries recorded in the list of locally stored STA entries. Frame, which APs do not respond to the probe frame. Among them, the The response policy is consistent with the foregoing response policy and will not be described here.

For example, when selecting, in the STA entry, there is at least one AP status information. First, it is determined that the STA to AP signal strength is higher than the set signal strength threshold, and the AP is considered to be more The STA is provided with wireless services, and the APs participate in the selection of the AP as the preferred AP, and the remaining APs participate in the policy judgment as the candidate AP. In the preferred AP, the detection frame of the target AP response STA with low load or less than the average value is selected. If there is no preferred AP, the same selection is made in the candidate AP. The final response decision is sent to each AP.

Specifically, S202 can be performed according to the following process:

Step 1: The centralized controller determines, according to the STA entry, whether the STA has established a wireless connection: If yes, execute step 2; if not, perform step 3.

Specifically, the AC first determines the current wireless connection state of the STA according to the STA entry to determine a response policy generated thereafter.

Step 2: The centralized controller selects at least one target AP according to the STA entry, and generates the response policy, so that the STA autonomously performs wireless network roaming or re-association.

Specifically, if it is determined that the STA has established a wireless connection, the AC selects at least one target AP according to the STA entry, and indicates that the target AP returns a probe response when receiving the probe frame of the STA, for the STA. A target AP is selected as a service AP to perform an update of the wireless connection, that is, wireless network roaming and re-association. The advantage of this is that the STA is provided with the AP for wireless network switching, so that the STA needs to switch the AP autonomously, ensuring compatibility and improving fault tolerance.

Step 3: The centralized controller selects at least one target _AP that provides wireless service for the STA according to the STA entry, and generates the response policy.

Specifically, if it is determined that the STA does not establish a wireless connection, the AC may select multiple target APs with the best performance according to the STA entry, so that the STA selects the serving AP to establish a wireless connection, or selects one of the best performances. An excellent target AP, for the STA to establish a wireless connection directly with the target AP.

Optionally, the S202 may further include: if the at least one target AP does not include the current serving AP, and the centralized controller determines that the STA does not switch the serving AP within the preset condition, sending an indication message indicating that the current serving AP is to the current serving AP The STA sends a disassociation message to trigger the STA. Re-broadcast the probe frame. Specifically, after the AC determines that the STA has established a wireless connection, the AC may select at least one target AP according to the STA entry, and determine whether the selected at least one target AP includes the current serving AP, and if The AC may not generate a response policy, and if not, the AC determines, after the preset condition, that the STA does not autonomously switch the serving AP, and indicates that the current serving AP releases the association with the STA, to trigger the STA to re-broadcast the detection frame, and The target AP is instructed to respond to the probe frame, and the re-established associated AP is a performance-optimized AP. The advantage of this is that the AC can dynamically adjust the load of the wireless network to ensure load balancing of the wireless network.

In this embodiment, the dynamic adjustment of the AP selection is implemented by the list of STAs that are locally established and updated in real time by the centralized controller, and the real-time response policy is released, thereby optimizing the load of the wireless network and ensuring network compatibility. Sex.

The following takes the scenario where the STA has established a wireless connection as an example:

After receiving the probe frames of the STAs, each AP sends the status information to the AC periodically or event-triggered. The AC establishes or updates the entries of each STA according to the status information, and refreshes the STA according to the data updated each time. For the STAs that have established a wireless connection, the AC determines whether the STA is in the best serving cell according to the channel quality of the STA to the AP (that is, whether the AP providing the wireless service is optimal), and the judgment here can be used. The signal strength information of the STA to the AP in the AP status information may also be based on the uplink MCS packet distribution information of the AP, and is not detailed here. If the signal strength of the STA to the AP is lower than the threshold, the STA is considered to be no longer in the best serving cell. In this case, the STA entry is checked, and the STA-to-AP signal strength threshold is used for determining, which is higher than the threshold. The AP (that is, the AP to be selected) is an candidate AP that is smaller than the threshold. If there is a preferred AP, the load status of the preferred AP can be further determined. The ranking can be compared with the group average or compared with the preset value. The method is not limited here, and the target AP is selected as the load meets the condition. If there is no preferred AP, the AP is sorted by the signal strength in the candidate AP, only when the signal strength of the candidate AP continues to be stronger than the current serving AP. When, or stronger than the signal strength of the current AP plus a signal strength bias When it is set, it can be used as a candidate AP. If the signal strength of multiple candidate APs is stronger than the current serving AP, the signals of these candidate APs must be compared with the signals of the strongest candidate AP. The candidate APs in the range of the strength deviation can be used as the APs to be selected. In these APs, the load comparison can be performed by using the sorting method, comparing with the group average value, or comparing with the preset value. The target AP is finally selected.

The AC sends the latest response policy to each AP. The response policy of the selected target AP is response detection. The response policies of the other APs are not responding. In this way, the terminal is triggered to perform service AP handover. If the terminal does not perform handover, The current serving AP is disconnected from the STA, and the STA is triggered to broadcast a new sounding frame. The STA can only discover the selected target AP. Therefore, the STA can only associate with the target AP, and the STA can be switched to the selected serving AP. purpose. Because the target AP is comprehensively selected by the channel environment and the load, the load between the APs is more balanced by switching.

FIG. 3 is a flowchart of Embodiment 3 of a method for selecting an access point according to the present invention. As shown in FIG. 3, the method may be performed according to the following process:

S301. The AP receives a response message that is sent by the centralized controller and carries a response policy, where the response message is sent by the centralized controller to the AP after receiving the status information sent by the AP, where the response policy is used to indicate that the At least one target AP in the AP of the response message responds to the sounding frame broadcast by the STA, and the other AP does not respond to the sounding frame broadcast by the STA; the at least one target AP is selected by the centralized controller according to the status information sent by the at least one AP, The status information includes load information of the AP that sent the status information.

Specifically, the status information may include load information of the AP. The load information of the AP is used to reflect the current load status of the AP, and may include one or any combination of the current usage duty ratio of the AP, the number of associated users, the number of concurrent users, and traffic.

Preferably, the status information may further include the quality information of the channel between the AP and the STA, and the at least one target AP is the AC according to the load information of each AP in the at least one AP and the quality information of the channel between each AP and the STA. And selected. The quality information of the channel is used to reflect the quality of the communication channel between each AP and the STA in the at least one AP, and may include signal strength information of each AP in the at least one AP to the STA and/or the at least one AP. Uplink MCS packet distribution information counted by each AP.

Optionally, before S301, the method may further include: receiving, by the AP, the STA broadcast After the frame is detected, the status information is sent to the centralized controller. Alternatively, the AP periodically or event-triggeredly sends the status information to the centralized controller, and no restrictions are imposed here.

Further, if the status information can be sent to the AC periodically or by the event triggering, the AC can dynamically control the wireless network, adjust the load of the AP in time, and optimize the working state of the wireless network.

The at least one target AP may be one or multiple, and may be selected according to actual conditions.

S302. If the AP has received the probe frame broadcast by the STA, determine, according to the response policy, whether the at least one target AP includes the AP, and if yes, respond to the probe frame, so that the STA selects a service from the at least one target AP. AP; if no, does not respond to the probe frame.

Specifically, the AP determines, according to the received response policy, whether it is one of the at least one target AP, and if yes, responds to the probe frame after receiving the probe frame of the STA, so that the STA can discover the AP, The STA can choose to establish a wireless connection with the AP. If the judgment itself is not included in the at least one target AP, the AP does not respond to the probe frame when receiving the probe frame broadcast by the STA.

In this embodiment, the AP receives the response message carrying the response policy, and determines whether to respond to the probe frame broadcast by the STA according to the response policy, thereby achieving optimality and high efficiency of the AP selection, ensuring load balancing of the wireless network, and solving the problem. The problem of AP selection efficiency is not high and AP selection is not optimized enough. In the present embodiment, since the AC is the control for responding to the AP by detecting the frame, the network access waiting time of the user is reduced as compared with the control of the AP response association request in the prior art.

Optionally, the embodiment may further include: the AP receiving the indication message sent by the centralized controller, and sending the disassociation message to the STA, to trigger the STA to re-broadcast the probe frame, where the indication message is sent. The centralized controller determines that the at least one target AP does not include the current serving AP, and is sent when it is determined that the STA does not switch the serving AP within a preset condition. Specifically, the AP is the current serving AP, and if the target AP does not include the current serving AP, and the STA does not automatically switch the serving AP within the preset condition, the AP sends a disassociation to the STA according to the indication message sent by the AC. A message to trigger the STA to broadcast a new probe frame.

4 is a flowchart of Embodiment 4 of a method for selecting an access point according to the present invention. In this embodiment, based on the embodiment shown in FIG. 3, the method may further include: before the S301, the AP is configured according to the response. Policy, establish or update the STA's response policy. Further, after S301, the method may further include: the AP receiving the probe frame broadcast by the STA; the AP determining whether the response policy of the STA is stored, and if not, sending the state information of the AP to the centralized controller, so as to concentrate The controller acquires status information of the AP, determines the at least one target AP, and sends the response message carrying the response policy. As shown in Figure 4, the method can be performed as follows:

S401: The AP receives the probe frame broadcast by the STA.

5402. The AP determines whether a response policy of the STA is stored, if not, sends the status information of the AP to the centralized controller, so that the centralized controller acquires status information of the AP, determines the at least one target AP, and sends the status information. The response message carrying the response policy.

Specifically, after receiving the probe frame broadcast by the STA, the AP does not directly respond to the probe frame, but first checks whether the STA's response policy is stored locally, and if so, indicates that it has been determined by the centralized controller. If it is not, the status information of the related information including the STA is reported to the AC, and the AC determines, that is, continues to execute S301.

S403. The AP establishes or updates a response policy of the STA according to the response policy.

In this embodiment, before the AP receives the probe frame of the STA, the AP checks whether the response policy of the STA is stored locally, and if so, directly processes the probe frame of the STA according to the response policy, and dynamically manages the wireless network in the centralized controller. It improves the access efficiency of the wireless network.

FIG. 5 is a signaling flowchart of Embodiment 5 of a method for selecting an access point according to the present invention. In this embodiment, a scenario in which a STA does not currently establish a wireless connection in a wireless network is taken as an example, and a wireless network consists of three APs (API, The composition of AP2 and AP3 is described as an example. As shown in Figure 5, the method can Follow the process below:

5501. The STA broadcasts a sounding frame.

5502, API, AP2, and AP3 send status information to the AC.

Before this step, AP1, AP2, and AP3 can also check whether the response policy of the STA is stored locally. Since the STA in this embodiment does not establish a wireless connection with the wireless network, it does not directly process according to the locally stored response policy.

5503. The AC generates a response policy according to the status information.

In this step, the AC can preset a collection time for receiving the status information. After the collection time is reached, the calculation and decision are started to generate a response strategy. For example, the API is instructed to respond to the probe frame, and AP2 and AP3 do not respond to the probe frame.

5504. The AC sends a response message carrying the response policy to AP1, AP2, and AP3.

5505. The API sends a probe response to the STA.

5506. The STA sends an association request to the API.

5507. The API sends an association response to the STA.

FIG. 6 is a signaling flowchart of Embodiment 6 of a method for selecting an access point according to the present invention.

The STA has established a wireless connection in the wireless network. For example, a wireless connection with the AP2 has been established. The same is true for the wireless network consisting of three APs (API, AP2, and AP3), as shown in Figure 6. , the method can be carried out as follows:

S601, API, AP2, and AP3 periodically or event-triggered to send status information.

S602. The AC generates a response policy according to the status information.

In this step, the AC selects AP1, AP2, and AP3 as the target APs according to the status information, and triggers the STA to select whether to switch the serving AP according to its own situation; or the AC only selects the API and AP3 as the target APs to trigger the STA switching service AP. .

The following steps describe the AC selection API and AP3 as the target AP.

S603. The AC sends a response message carrying the response policy to AP1, AP2, and AP3.

5604. The STA broadcasts a sounding frame.

In this step, the STA can autonomously switch the serving AP to broadcast a sounding frame to the wireless network.

5605. The API and AP3 send a probe response to the STA.

In this step, AP1, AP2, and AP3 first determine whether the STA's response policy is stored locally. According to S603, AP1, AP2, and AP3 locally store the response of the STA. Strategy.

Since the response policy stored locally by AP2 is not responding, AP2 does not work.

5606. The STA releases the association with the AP2.

Optionally, before the step, if the STA performs wireless network roaming, the procedure is not performed; if the STA is ready to disconnect the wireless connection and then re-access, the terminal is executed.

5607. The STA sends an association request to the API.

In this step, the STA selects the API as the serving AP by judging.

5608. The API sends an association response to the STA.

Optionally, in this embodiment, the AC may also determine, according to the periodic or event-triggered status information, whether the selected target AP is consistent with the AP that is currently providing the wireless service for the STA, and if not, may generate a response through the decision. The policy indicates that one or more target APs respond to the probe frame that the STA is about to broadcast. If the STA does not act within a certain period of time, that is, if there is no autonomous wireless connection roaming or no re-association service AP, the AP providing the service may be cancelled. Association with the STA, thereby triggering the STA to send a probe frame to re-establish association.

FIG. 7 is a schematic structural diagram of Embodiment 1 of the centralized controller of the present invention. As shown in FIG. 7, the centralized controller may include: a first receiving module 71, a processing module 72, and a sending module 73. The first receiving module 71 may be configured to receive status information sent by the at least one access point AP, where the status information may include load information of the AP that sends the status information; the processing module 72 may be configured to receive, according to the first The status information received by the module 71 is selected as the at least one target AP that provides the wireless service to the STA. The sending module 73 is configured to send the response policy to the at least one AP according to the at least one target AP selected by the processing module 72. The response message is used to indicate that the at least one target AP responds to the probe frame broadcast by the STA, and the other AP does not respond to the probe frame broadcast by the STA, so that the STA selects the serving AP from the at least one target AP.

Optionally, the processing module 72 is further configured to: if the status information further includes quality information of a channel between the AP that sends the status information and the STA, according to load information of each AP in the at least one AP, and each The quality information of the channel between the AP and the STA is selected as the at least one target AP that provides the wireless service to the STA.

Optionally, the processing module 72 is further configured to: after selecting at least one target AP that provides wireless service for the STA, according to status information of the at least one AP, if the at least one destination The target AP does not include the current serving AP, and determines that the STA does not switch the serving AP within the preset condition, and sends an indication message indicating that the current serving AP sends a disassociation message to the STA to trigger the STA to re-broadcast the sounding frame.

Optionally, the processing module 72 is further configured to: after receiving the status information sent by the at least one AP, determine whether the entry of the STA is stored, and if yes, update the entry of the STA according to the status information, if not And generating, according to the status information, an entry of the STA; the entry of the STA is used to store the received status information of the corresponding STA; and according to the status information stored by the STA entry, the wireless service is selected for the STA. The at least one target AP.

The device of this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 1 and FIG. 2, and the specific functions thereof are described in the foregoing method embodiments, and details are not described herein again.

The centralized controller of this embodiment receives, according to the first receiving module, the processing module

The status information sent by the AP determines at least one target AP that provides the wireless service to the STA, and sends a response message carrying the response policy to each AP through the sending module, so that the target AP responds to the STA's detection frame, and the AP selection is optimal. Sexuality and high efficiency ensure the load balancing of the wireless network and solve the problem that the AP selection efficiency is not high and the AP selection is not optimized.

FIG. 8 is a schematic structural diagram of Embodiment 1 of an AP device according to the present invention. As shown in FIG. 8, the AP device may include: a second receiving module 81 and a response module 82. The second receiving module 81 may be configured to receive, by the centralized controller, a response message carrying a response policy, where the response message is sent by the centralized controller to the AP after receiving the status information sent by the AP, the response policy. It may be used to indicate that at least one target AP in the AP that receives the response message responds to the probe frame broadcast by the STA, and the other AP does not respond to the probe frame broadcast by the STA; the at least one target AP is sent by the centralized controller according to the at least one AP. The status information is selected by the STA, and the status information may include load information of the AP that sends the status information. The response module 82 may be configured to determine, according to the response policy, if the probe frame broadcast by the STA has been received. Whether at least one target AP includes the AP, and if so, responding to the probe frame, so that the STA selects a serving AP from the at least one target AP; if not, does not respond to the probe frame.

Optionally, the status information may further include: the quality information of the channel between the AP that sends the status information and the STA; and the at least one target AP that is selected by the centralized controller according to the status information sent by the at least one AP may include: The at least one target AP is a centralized controller according to load information of each AP in the at least one AP and a quality of a channel between each AP and the STA The information is selected for the STA.

Optionally, the response module 82 is further configured to: receive the centralized controller to send an indication message, and send a disassociation message to the STA, to trigger the STA to re-broadcast the probe frame, where the indication message may be that the centralized controller determines the at least A target AP does not include the current serving AP, and is determined to be sent when the STA does not switch the serving AP within a preset condition.

The device in this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 3 and FIG. 4, and the specific functions thereof are described in the foregoing method embodiments, and details are not described herein again.

The AP device of the embodiment receives the response message carrying the response policy by using the second receiving module, and determines whether the response frame broadcasted by the STA is responded to by the response module according to the response policy, thereby achieving optimality and high efficiency of the AP selection, and ensuring The load balancing of the wireless network solves the problem that the AP selection efficiency is not high and the AP selection is not optimized enough.

FIG. 9 is a schematic structural diagram of Embodiment 2 of the centralized controller of the present invention. As shown in FIG. 9, the centralized controller may include: a receiver 91, a processor 92, and a memory 93, where: the receiver 91 may be configured to receive at least Status information sent by an AP, the status information may include load information of an AP that sends the status information; the memory 93 may store a set of program codes, and the processor 92 may invoke the program code to perform the following operations: The status information of an AP is selected to be at least one target AP that provides the wireless service to the STA, and the response message carrying the response policy is sent to the at least one AP, where the response policy is used to indicate that the at least one target AP responds to the STA broadcast. Frame, the other AP does not respond to the probe frame broadcast by the STA; so that the STA selects the serving AP from the at least one target AP. This memory 93 can also be used to store the response policy.

Optionally, the status information may further include quality information of a channel between the AP that sends the status information and the STA.

The centralized controller of the embodiment determines, by the processing module, at least one target AP that provides a wireless service for the STA according to the status information sent by each AP received by the first receiving module, and sends a response policy to each AP through the sending module. The response message is configured to enable the at least one target AP to respond to the STA's sounding frame, thereby achieving optimality and efficiency of the AP selection, ensuring load balancing of the wireless network, and solving the problem that the AP selection efficiency is not high and the AP selection is not optimized. FIG. 10 is a schematic structural diagram of Embodiment 2 of an AP device according to the present invention. As shown in FIG. 10, the AP device may include: a receiver 101 and a processor 102. The receiver 101 may be configured to receive a response message that is sent by the centralized controller and that carries a response policy, where the response policy may be used to receive a response message that is sent by the centralized controller and that carries a response policy, where the response message is a centralized controller. After receiving the status information sent by the AP, the response policy is used to indicate that at least one target AP in the AP that received the response message responds to the probe frame broadcast by the STA, and the other AP does not respond to the STA broadcast by the STA. Detecting a frame; the at least one target AP is selected by the centralized controller according to the status information sent by the at least one AP, the status information includes load information of the AP that sends the status information; the processor 102 may be configured to receive The probe frame broadcasted by the STA determines whether the at least one target AP includes the AP according to the response policy, and if yes, responds to the probe frame, so that the STA selects a service AP from the at least one target AP; if not, does not ring The frame should be probed.

In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as the unit may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. . Can choose according to actual needs Some or all of the units are used to achieve the objectives of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a hardware plus software functional unit.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the method of various embodiments of the present invention. Partially. The foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program code. .

A person skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of each functional module described above is exemplified. In practical applications, the above function assignment can be completed by different functional modules as needed, that is, the device is installed. The internal structure is divided into different functional modules to perform all or part of the functions described above. For the specific working process of the device described above, reference may be made to the corresponding process in the foregoing method embodiments, and details are not described herein again.

It should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

Claim

A method for selecting an access point, which is characterized by comprising:

The centralized controller receives status information sent by the at least one access point AP, where the status information includes load information of the AP that sends the status information;

The centralized controller is selected as a workstation according to status information of the at least one AP

The STA provides at least one target AP of the wireless service;

The method according to claim 1, wherein the status information further includes quality information of a channel between the AP that sends the status information and the STA;

And the centralized controller selects the at least one target AP that provides the wireless service for the STA according to the load information of each AP in the at least one AP and the quality information of the channel between each AP and the STA.

The method according to claim 1 or 2, wherein the status information is sent by the at least one AP to the centralized controller after receiving the probe frame broadcast by the STA, or The at least one AP is periodically or event triggered to be sent to the centralized controller.

The method according to any one of claims 1 to 3, wherein the centralized controller, after selecting at least one target AP that provides wireless service for the STA, according to the status information of the at least one AP, further includes :

The method according to any one of claims 1 to 4, wherein after the centralized controller receives the status information sent by the at least one AP, the method further includes:

Determining, by the centralized controller, whether an entry of the STA is stored, and if so, according to the Updating the entry of the STA by using the status information;

If not, the entry of the STA is generated according to the status information; the entry of the STA is used to store the received status information corresponding to the STA;

The method according to any one of claims 2 to 5, wherein the centralized controller selects a target AP that provides a wireless service for the STA according to the status information of the at least one AP, and includes:

The method according to any one of claims 2 to 6, wherein the quality information of the channel includes signal strength information of a channel between each AP of the at least one AP and the STA, or The uplink modulation and coding policy MCS packet distribution information of each AP in at least one AP.

8. A method for selecting an access point, which is characterized by comprising:

The access point AP receives the response message that is sent by the centralized controller and carries the response policy, where the response message is sent by the centralized controller to the AP after receiving the status information sent by the AP, the response policy. ???said at least one target AP in the AP that receives the response message responds to the sounding frame broadcast by the workstation STA, the other AP does not respond to the sounding frame broadcast by the STA; the at least one target AP is the centralized control The device is selected by the STA according to the status information sent by the at least one AP, where the status information includes load information of the AP that sends the status information.

If the AP has received the probe frame broadcast by the STA, determining, according to the response policy, whether the at least one target AP includes the AP, and if yes, responding to the probe frame, so that the STA is from the at least The serving AP is selected in a target AP; if not, the probe frame is not responded.

The method according to claim 8, wherein the status information further includes quality information of a channel between the AP that sends the status information and the STA;

The at least one target AP is selected by the centralized controller for the STA according to the status information sent by the at least one AP, and includes:

The at least one target AP is the centralized controller according to each of the at least one AP

The load information of the AP and the quality information of the channel between each AP and the STA are selected by the STA.

The method according to claim 8 or 9, wherein before the receiving the response message sent by the centralized controller and carrying the response policy, the AP further includes:

Alternatively, the AP periodically or event triggers the status information to the centralized controller.

The method according to any one of claims 8 to 10, further comprising: receiving, by the AP, an indication message sent by the centralized controller, and sending a disassociation message to the STA, to trigger the The STA re-broadcasts the sounding frame, and the indication message is that the centralized controller determines that the at least one target AP does not include the current serving AP, and is sent when it is determined that the STA does not switch the serving AP within a preset condition.

The method according to any one of claims 8 to 11, wherein, after receiving the response message that is sent by the centralized controller and carrying the response policy, the AP further includes:

The method according to claim 12, wherein before the receiving the response message sent by the centralized controller and carrying the response policy, the AP further includes:

Receiving, by the AP, a sounding frame broadcast by the STA;

Determining, by the AP, a response policy of the STA, if not, sending the status information of the AP to the centralized controller, so that the centralized controller acquires status information of the AP, determining the At least one target AP, and transmitting the response message carrying the response policy.

14. A centralized controller, comprising:

a first receiving module, configured to receive status information sent by at least one access point AP, where The status information includes load information of the AP that sends the status information;

a processing module, configured to select, according to the status information received by the first receiving module, at least one target AP that provides a wireless service for the workstation STA;

a sending module, configured to send, according to the at least one target AP selected by the processing module, a response message carrying a response policy to the at least one AP, where the response policy is used to indicate that the at least one target AP responds to the STA The broadcast probe frame, the other AP does not respond to the probe frame broadcast by the STA, so that the STA selects a serving AP from the at least one target AP.

The centralized controller according to claim 14, wherein the processing module is further configured to: if the status information further includes quality information of a channel between the AP that sends the status information and the STA And selecting, according to the load information of each AP in the at least one AP and the quality information of the channel between each AP and the STA, the at least one target AP that provides the wireless service to the STA.

The centralized controller according to claim 14 or 15, wherein the processing module is further configured to: after selecting at least one target AP that provides wireless service for the STA according to status information of the at least one AP And if the at least one target AP does not include the current serving AP, and determines that the STA does not switch the serving AP within a preset condition, sending an indication message that the current serving AP sends a disassociation message to the STA to trigger The STA re-broadcasts the sounding frame.

The centralized controller according to any one of claims 14 to 16, wherein the processing module is further configured to: after receiving the status information sent by the at least one AP, determine whether the entry of the STA is stored If yes, the entry of the STA is updated according to the status information, and if not, the entry of the STA is generated according to the status information; the entry of the STA is used to store the received corresponding Status information of the STA; selecting the at least one target AP that provides the wireless service for the STA according to the status information stored by the STA entry.

18. An access point device, comprising:

a second receiving module, configured to receive a response message that is sent by the centralized controller and that carries the response policy, where the response message is sent by the centralized controller to the AP after receiving the status information sent by the access point AP, The response policy is used to indicate that at least one target AP in the AP that receives the response message responds to the probe frame broadcast by the workstation STA, and the other AP does not respond to the The probe frame broadcasted by the STA; the at least one target AP is selected by the centralized controller according to status information sent by the at least one AP, and the status information includes a load of the AP that sends the status information. information;

a response module, configured to determine, according to the response policy, whether the at least one target AP includes the AP, if yes, responding to the probe frame, so that the STA is Selecting a service AP from the at least one target AP; if not, not responding to the probe frame.

The access point device according to claim 18, wherein the status information further includes quality information of a channel between the AP that sends the status information and the STA; the at least one target AP is The centralized controller is selected according to the status information sent by the at least one AP, and includes:

The access point device according to claim 18 or 19, wherein the response module is further configured to:

Receiving the indication message sent by the centralized controller, and sending a disassociation message to the STA, to trigger the STA to re-broadcast the probe frame, where the indication message is that the centralized controller determines that the at least one target AP does not include the current The AP is served and is determined to be sent within the preset condition when the STA does not switch the serving AP.

21. A centralized controller, comprising: a receiver, a processor, and a memory, wherein:

The memory stores a set of program codes, and the processor calls the program code to: perform at least one target AP that provides wireless service for the workstation STA according to status information of the at least one AP, to the At least one AP sends a response message carrying a response policy, where the response policy is used to indicate that the at least one target AP responds to the probe frame broadcast by the STA, and the other AP does not respond to the probe frame broadcast by the STA; The STA selects a serving AP from the at least one target AP. The memory is also used to store the response policy.

The centralized controller according to claim 21, wherein the status information further comprises quality information of a channel between the AP that sends the status information and the STA.

23. An access point device, comprising:

a receiver, configured to receive, by the centralized controller, a response message carrying a response policy, where the response message is sent by the centralized controller to the AP after receiving status information sent by the access point AP, The response policy is used to indicate that at least one target AP in the AP that receives the response message responds to the probe frame broadcast by the workstation STA, and the other AP does not respond to the probe frame broadcast by the STA; the at least one target AP is the The centralized controller is selected by the STA according to the status information sent by the at least one AP, where the status information includes load information of the AP that sends the status information;

The access point device according to claim 23, wherein the status information further includes quality information of a channel between the AP that sends the status information and the STA.