CN104380809B

CN104380809B - The selection method and device of access point

Info

Publication number: CN104380809B
Application number: CN201380000335.7A
Authority: CN
Inventors: 王舜禹
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2013-06-05
Filing date: 2013-06-05
Publication date: 2018-08-14
Anticipated expiration: 2033-06-05
Also published as: CN104380809A; WO2014194492A1

Abstract

The embodiment of the present invention provides a kind of selection method and device of access point.The selection method of access point of the present invention includes：Centralized Controller receives the status information that each AP is sent, and status information includes the load information for the AP for sending status information；According to the status information of each AP, it is chosen at least one target AP that STA provides service；The response message for carrying response policy is sent to each AP, response policy is used to indicate the detection frame of target AP response STA broadcast, other AP are not responding to, so that STA selects service AP from least one target AP.Centralized Controller of the embodiment of the present invention is determined as the target AP that STA provides wireless service according to each AP status informations sent, to respond the detection frame of STA, realizes the optimality and high efficiency of AP selections.

Description

The selection method and device of access point

Technical field

The present embodiments relate to the communication technology more particularly to the selection methods and device of a kind of access point.

Background technology

The WLAN of operator（Wireless Local Area Network, abbreviation WLAN）It is thin to be connect multiple Access point（Access Point, abbreviation AP）Management function put together, formed a new network element, that is, access controller （Access Controller, abbreviation AC）, manage the thin AP in configuration WLAN concentratedly using AC, form wireless network.

Work as work station（Station, abbreviation STA）When needing to access wireless network, detection frame is broadcasted by STA, AP receives spy Probe response is replied after surveying frame, STA can choose service AP according to the signal strength of each AP probe responses replied later, complete Association request is initiated to the service AP of selection after certification, the service AP of the selection returns to associated response to the STA, completes to be associated with STA can carry out service interaction with the service AP of the selection later.During above-mentioned network insertion, choosings of the STA to AP The loading condition for not accounting for AP is selected, when AP loads are very big, communication performance can be seriously affected.In order to solve this problem, existing Technology judges the loading condition of the service AP of the selection by AC after STA initiates association request to the service AP of selection To decide whether to respond STA, to realize the load balancing of AP selections.

But it is above-mentioned in the prior art, STA to AP to be associated send association request after, need wait for AC loaded Balanced judgement increases the delay of STA access networks, and STA and AC respectively select service AP, makes AP selection effects Rate is not high；In addition, AC only considered the load of AP when to service AP selections, make AP selections not enough optimization.

Invention content

The embodiment of the present invention provides a kind of selection method and device of access point, to solve the inefficient and AP of AP selections The problem of selection not enough optimizes, to realize the high efficiency and optimality of AP selections.

In a first aspect, the embodiment of the present invention provides a kind of selection method of access point, including：

Centralized Controller receives the status information that at least one access point AP is sent, and the status information includes described in transmission The load information of the AP of status information；

The Centralized Controller is chosen for work station STA and provides wireless clothes according to the status information of at least one AP At least one target AP of business；

The Centralized Controller sends the response message for carrying response policy, the response plan at least one AP It is slightly used to indicate the detection frame that at least one target AP responds the STA broadcast, other AP are not responding to the STA broadcast The detection frame, so that the STA selects service AP from least one target AP.

In the first possible realization method of first aspect, the status information further includes sending the status information AP and the STA between channel quality information；

The Centralized Controller is chosen for STA and provides wireless service extremely according to the status information of at least one AP A few target AP, including：

The Centralized Controller is believed between the load information and each AP and the STA according to each AP at least one AP The quality information in road is chosen at least one target AP that the STA provides wireless service.

According to the possible realization method of the first of first aspect or first aspect, in second of possible realization method In, the status information is that at least one AP is sent to the collection after the detection frame for receiving the STA broadcast Middle controller or described at least one AP periodicity or event triggering property are sent to the Centralized Controller.

According to first aspect, first aspect the first to second possible realization method any one, in third In the possible realization method of kind, the Centralized Controller is chosen for STA and provides nothing according to the status information of at least one AP After at least one target AP of line service, further include：

If at least one target AP does not include current service AP, and the Centralized Controller determines in preset condition The STA does not switch service AP, then sends instruction message and indicate that the current service AP sends disassociation to the STA and disappears Breath, detection frame is re-broadcast to trigger the STA.

According to first aspect, first aspect the first to the third possible realization method any one, the 4th In the possible realization method of kind, after the Centralized Controller receives the status information that at least one AP is sent, further include：

The Centralized Controller determines whether the list item for being stored with the STA, if so, then according to the state information updating The list item of the STA；

If nothing, the list item of the STA is generated according to the status information；The list item of the STA is received for storing The correspondence STA status information；

The status information that the Centralized Controller is stored according to the list item of the STA is chosen for the STA and provides wireless clothes At least one target AP of business.

According to first aspect the first to the 4th kind of possible realization method any one, in the 5th kind of possible reality In existing mode, the Centralized Controller is chosen for the mesh that STA provides wireless service according to the status information of at least one AP AP is marked, including：

The Centralized Controller is according to the quality information of channel and pre- between each AP and the STA at least one AP Gating limits, and determines AP to be selected；

The Centralized Controller chooses the minimum at least one AP of load as described at least one in the AP to be selected Target AP.

According to first aspect the first to the 5th kind of possible realization method any one, in the 6th kind of possible reality In existing mode, the quality information of the channel includes that the signal of channel between each AP to the STA at least one AP is strong Information is spent, or, the uplink of each AP statistics is modulated and coding strategy MCS packet distributed intelligences at least one AP.

Second aspect, the embodiment of the present invention provide a kind of selection method of access point, including：

Access point AP receives the response message for carrying response policy that Centralized Controller is sent, and the response message is institute It states Centralized Controller and is sent to the AP after receiving the status information that the AP is sent, the response policy is used to indicate The detection frame of at least one of AP of response message target AP responsive operations station STA broadcast is received, other AP are not rung Answer the detection frame of the STA broadcast；At least one target AP is that the Centralized Controller is sent out according at least one AP The status information sent is what the STA chose, and the status information includes the load information for the AP for sending the status information；

If the AP has received the detection frame of the STA broadcast, according at least one described in response policy determination Whether a target AP includes the AP, if so, the detection frame is responded, so that the STA is from least one target AP Selection service AP；If it is not, being not responding to the detection frame.

In the first possible realization method of second aspect, the status information further includes sending the status information AP and the STA between channel quality information；

It according at least one AP status informations sent is described that at least one target AP, which is the Centralized Controller, What STA chose, including：

At least one target AP is load information of the Centralized Controller according to each AP at least one AP The quality information of channel is what the STA chose between each AP and the STA.

According to the possible realization method of the first of second aspect or second aspect, in second of possible realization method In, before the AP receives the response message for carrying response policy that Centralized Controller is sent, further include：

The AP sends the status information to the Centralized Controller after the detection frame for receiving the STA broadcast；

Or the AP periodicity or event triggering property send the status information to the Centralized Controller.

According to second aspect, second aspect the first to second of possible realization method, in the third possible reality In existing mode, further include：

The AP receives the instruction message that the Centralized Controller is sent, and disassociation message is sent to the STA, to touch Sending out STA described re-broadcasts detection frame, and the instruction message is that the Centralized Controller determines at least one target AP not Including current service AP, and determines in preset condition and to be sent when the STA does not switch service AP.

According to second aspect, second aspect the first to the third possible realization method, in the 4th kind of possible reality In existing mode, after the AP receives the response message for carrying response policy that Centralized Controller is sent, further include：

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

According to the 4th of second aspect the kind of possible realization method, in the 5th kind of possible realization method, the AP connects Before receiving the response message for carrying response policy that Centralized Controller is sent, further include：

The AP receives the detection frame of the STA broadcast；

The AP determines whether the response policy for being stored with the STA, if nothing, described in Centralized Controller transmission The status information of AP determines at least one target AP so that the Centralized Controller obtains the status information of the AP, And send the response message for carrying the response policy.

The third aspect, the embodiment of the present invention provide a kind of Centralized Controller, including：

First receiving module, the status information sent for receiving at least one access point AP, the status information include Send the load information of the AP of the status information；

Processing module, the status information for being received according to first receiving module are chosen for work station STA and carry For at least one target AP of wireless service；

Sending module, at least one target AP for being chosen according to the processing module is at least one AP The response message for carrying response policy is sent, the response policy is used to indicate described at least one target AP responses The detection frame of STA broadcast, other AP are not responding to the detection frame of STA broadcast, so that the STA is from described at least one Selection service AP in target AP.

In the first possible realization method of the third aspect, the processing module is additionally operable to：If the status information When further including the quality information of channel between the AP and the STA for sending the status information, according at least one AP The quality information of channel between the load information of each AP and each AP and the STA is chosen for the institute that the STA provides wireless service State at least one target AP.

According to the possible realization method of the first of the third aspect or the third aspect, in second of possible realization method In, the processing module is additionally operable to：In the status information according at least one AP, it is chosen for STA and wireless service is provided After at least one target AP, if at least one target AP does not include current service AP, and institute is determined in preset condition It states STA and does not switch service AP, then send instruction message and indicate that the current service AP sends disassociation message to the STA, Detection frame is re-broadcast to trigger the STA.

According to the third aspect, the third aspect the first to second of possible realization method, in the third possible reality In existing mode, the processing module is additionally operable to：After the status information for receiving at least one AP transmissions, it is determined whether storage is The list item of STA is stated, if so, then according to the list item of STA described in the state information updating, if nothing, according to the status information Generate the list item of the STA；The list item of the STA is used to store the status information of the correspondence STA received；According to described The status information of the list item storage of STA, is chosen at least one target AP that the STA provides wireless service.

Fourth aspect, the embodiment of the present invention provide a kind of access point apparatus, including：

Second receiving module, the response message for carrying response policy for receiving Centralized Controller transmission, the sound It is that the Centralized Controller is sent to the AP, the response after receiving the status information that access point AP is sent to answer message Strategy is used to indicate the detection of at least one of AP for receiving response message target AP responsive operations station STA broadcast Frame, other AP are not responding to the detection frame of the STA broadcast；At least one target AP be the Centralized Controller according to The status information that at least one AP is sent is what the STA chose, and the status information includes sending the AP of the status information Load information；

Respond module, if the detection frame for having received the STA broadcast, according to response policy determination Whether at least one target AP includes the AP, if so, respond the detection frame, so that the STA is from least one mesh Mark selection service AP in AP；If it is not, being not responding to the detection frame.

In the first possible realization method of fourth aspect, the status information further includes sending the status information AP and the STA between channel quality information；

At least one target AP is that the Centralized Controller is chosen according to the status information that at least one AP is sent , including：

According to the possible realization method of the first of fourth aspect or fourth aspect, in second of possible realization method In, the respond module is additionally operable to：

The instruction message that the Centralized Controller is sent is received, disassociation message is sent to the STA, described in triggering STA re-broadcasts detection frame, and the instruction message is that the Centralized Controller determines at least one target AP not including working as Preceding service AP, and determine in preset condition and to be sent when the STA does not switch service AP.

5th aspect, the embodiment of the present invention provide a kind of Centralized Controller, including receiver, processor and memory, In：

The receiver is used to receive the status information that at least one access point AP is sent, and the status information includes sending The load information of the AP of the status information；

The memory is stored with batch processing code, and the processor calls said program code, to execute following behaviour Make：According to the status information of at least one AP, it is chosen at least one target AP that work station STA provides wireless service, The response message for carrying response policy is sent at least one AP, the response policy is used to indicate described at least one Target AP responds the detection frame of the STA broadcast, other AP are not responding to the detection frame of the STA broadcast；So as to the STA The selection service AP from least one target AP.

The memory is additionally operable to store the response policy.

In the first possible realization method of the 5th aspect, the status information further includes sending the status information AP and the STA between channel quality information.

6th aspect, the embodiment of the present invention provide a kind of access point apparatus, including：

Receiver, the response message for carrying response policy for receiving Centralized Controller transmission, the response message It is that the Centralized Controller is sent to the AP after receiving the status information that access point AP is sent, the response policy is used The detection frame of at least one of AP of response message target AP responsive operations station STA broadcast is received in instruction, other AP is not responding to the detection frame of the STA broadcast；At least one target AP is the Centralized Controller according at least one The status information that a AP is sent is what the STA chose, and the status information includes the load for the AP for sending the status information Information；

Processor, if the detection frame for having received STA broadcast, according to the response policy determine described in extremely Whether a few target AP includes the AP, if so, respond the detection frame, so that the STA is from least one target Selection service AP in AP；If it is not, being not responding to the detection frame.

In the first possible realization method of the 6th aspect, the status information further includes sending the status information AP and the STA between channel quality information.

The selection method and device of access point of the embodiment of the present invention, Centralized Controller are true according to the status information that each AP is sent It is set to the target AP that STA provides wireless service, to respond the detection frame of STA, selects service AP from these targets AP for STA, Realize AP selection optimality and high efficiency, ensure that the load balancing of wireless network, solve AP efficiencies of selection it is not high and The problem of AP selections not enough optimize.Meanwhile in the present embodiment, since AC is the control to being done when AP echo probe frames, relative to In the prior art for AP responds the control of association request, the network insertion stand-by period of user is reduced.

Description of the drawings

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair Some bright embodiments for those of ordinary skill in the art without having to pay creative labor, can be with Obtain other attached drawings according to these attached drawings.

Fig. 1 is the flow chart of the selection method embodiment one of access point of the present invention；

Fig. 2 is the flow chart of the selection method embodiment two of access point of the present invention；

Fig. 3 is the flow chart of the selection method embodiment three of access point of the present invention；

Fig. 4 is the flow chart of the selection method example IV of access point of the present invention；

Fig. 5 is the signaling process figure of the selection method embodiment five of access point of the present invention；

Fig. 6 is the signaling process figure of the selection method embodiment six of access point of the present invention；

Fig. 7 is the structural schematic diagram of Centralized Controller embodiment one of the present invention；

Fig. 8 is the structural schematic diagram of AP apparatus embodiments one of the present invention；

Fig. 9 is the structural schematic diagram of Centralized Controller embodiment two of the present invention；

Figure 10 is the structural schematic diagram of AP apparatus embodiments two of the present invention.

Specific implementation mode

In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.

Fig. 1 is the flow chart of the selection method embodiment one of access point of the present invention, and this method is suitable for connecing for wireless network Enter selection, is based especially on the access selection of the wireless network of AP load balancing.This method can be matched by Centralized Controller and AP It closes and completes, and do not have any requirement to STA and procotol, completely by network side（Such as AP and AC）Control, compatibility are high.Its In, the entity of the Centralized Controller is not limited to AC, can be independent server, or a certain specific AP, as long as It can realize the centralized control functions to each AP.Meanwhile the wireless network is not limited to the wlan network of operator, also may be used To be the typical networks WLAN formed by fat AP.All embodiments below are AC with Centralized Controller, and wireless network is It is illustrated for the wlan network of operator, as shown in Figure 1, this method can be carried out according to following flow：

S101, Centralized Controller receive the status information that at least one AP is sent, which includes sending the state The load information of the AP of information.

Wherein, which is used to reflect the current load conditions of the AP for sending the status information, may include the AP Current use duty ratio, association user number, concurrent user number, one of information such as flow or arbitrary combination；

Preferably, which can also include the quality of channel between the AP and the STA for sending the status information Information.The quality information of the channel is used to reflect the quality of the communication channel at least one AP between each AP and the STA, can To count upper including each AP in each AP at least one AP to the signal strength information of the STA and/or at least one AP Row modulation and coding strategy（Modulation and Coding Scheme, abbreviation MCS）Packet distributed intelligence.

Optionally, which can be that at least one AP is sent to after the detection frame for receiving STA broadcast Centralized Controller, can also be that at least one AP periodicity or event triggering property are sent to Centralized Controller, herein not Do any restrictions.Wherein, event triggering property can be triggered by the channel quality thresholds value being arranged, e.g., if service AP sentences The disconnected channel quality with STA less than setting threshold value when can send status information to AC, for another example, non-serving AP judge with Status information can be sent when the channel quality of STA is higher than the threshold value being arranged to AC；Event triggering property can also be by setting The data packetloss rate triggering set, but not limited to this, herein by way of example only, can be configured according to actual conditions.

S102, Centralized Controller are chosen for STA and provide wireless service at least according to the status information of at least one AP One target AP.

For example, AC chooses load minimum according to the load information of each AP in the status information of at least one AP transmissions Multiple AP select service AP according to signal strength as at least one target AP, for the STA from least one target AP.

Preferably, if the status information can also include the quality of channel between the AP and the STA for sending the status information The status information that at least one AP that information, i.e. AC receive is sent can also include the quality of channel between each AP and STA Information, then AC is according to the quality information of channel between the load information and each AP and the STA of each AP at least one AP, selection The target AP of wireless service is provided for the STA.The selection process can carry out in accordance with the following methods：

Method one

After AC pre-sets a load-threshold value, the load information in the status information is handled, load is born less than this At least one AP of threshold value is carried as AP to be selected；AC selects channel quality further according to the quality information of channel from AP to be selected Good one or more AP are as at least one target AP.

If the load of AP is above the load-threshold value, AC can not choose target AP, can also be according to load information Select to load smaller one or more AP as at least one target AP.

Alternatively, AC can be not provided with the load-threshold value, it is small at least directly to choose load according to the load information of each AP Then one AP selects the one or more that channel quality is good further according to the quality information of channel as AP to be selected from AP to be selected AP is as at least one target AP.

Method two

Quality information and pre- gating of the Centralized Controller according to the channel at least one AP between each AP and the STA Limit, determines AP to be selected；Centralized Controller chooses the minimum at least one AP of load as at least one mesh in the AP to be selected Mark AP.This have the advantage that target AP can be ensure that most to avoid the AP for selecting channel quality very poor as target AP Dominance.

Specifically, AC pre-sets a channel quality thresholds value, handles the quality information of the channel in the status information, The channel quality is more than at least one AP of the channel quality thresholds value as AP to be selected；AC is further according to load information, from waiting for It selects and selects to load low one or more AP in AP as at least one target AP.

If the channel quality of AP is below the channel quality thresholds value, AC can not choose target AP, can also basis The quality information of channel selects channel quality preferably one or more AP as at least one target AP.

Alternatively, AC can be not provided with the channel quality thresholds value, channel quality is directly chosen according to the channel quality of each AP Then high at least one AP selects to load small one or more AP from AP to be selected further according to load information as AP to be selected As target AP.

Above two method by way of example only, can flexible specified rule, such as base as needed to the selection of target AP In the statistical forecast etc. of historical data, no limitations are hereby intended, as long as the selection of target AP can be realized.

Wherein, at least one target AP can be one or more, if one, then can indicate the STA directly with One target AP establishes association, is wirelessly connected to establish or update, this have the advantage that, it can be provided most for STA Excellent service AP, while not needing STA and target AP is selected, improve wireless network access efficiency；It, then can be with if multiple Indicate that the STA selects service AP, the i.e. independently selection service from the target AP of multiple optimizations by the STA from multiple target AP AP improves independence and the flexibility of STA.

S103, Centralized Controller send the response message for carrying response policy, the response policy at least one AP It is used to indicate the detection frame that at least one target AP responds STA broadcast, other AP are not responding to the detection frame of STA broadcast, So that the STA selects service AP from least one target AP.

Specifically, after determining at least one target AP, AC generates response policy, which is used to indicate target AP The detection frame is responded, i.e., sends probe response to the STA when receiving the detection frame of STA broadcast, is taken so that the STA chooses Be engaged in AP；The response policy is additionally operable to indicate that other AP are not responding to the detection frame, i.e., not when receiving the detection frame of STA broadcast Probe response is sent to the STA.Wherein, which is in the AP that AC receives status information, except being chosen for target AP AP in addition.

The response policy is sent at least one AP by AC, which determines whether to ring according to the response policy Should STA detection frame, so that the STA selects service AP to initiate association request from target AP, to being established with target AP or Update is wirelessly connected.The update is wirelessly connected：The roaming of wireless network or the association again of wireless connection.

Wherein, it if not setting up wireless network before the STA, or is disconnected with wireless network, then the STA is from least one Selection service AP, which is established, in a target AP is wirelessly connected；If the STA has service AP at this time, the STA is from least one target AP The new service AP of middle selection carries out the switching of service AP, realizes the roaming of wireless network or is associated with again.

The present embodiment, Centralized Controller are determined as the target that STA provides wireless service according to each AP status informations sent AP selects from these targets AP service AP for STA to respond the detection frame of STA, realizes the optimality and efficiently of AP selections Property, it ensure that the load balancing of wireless network, solve the problems, such as that AP efficiencies of selection are not high and AP selections not enough optimize.Meanwhile In the present embodiment, since AC is the control to being done when AP echo probe frames, compared with the existing technology in AP respond association request Control for, reduce the network insertion stand-by period of user.

Optionally, Centralized Controller is chosen for STA and provides wireless service extremely according to the status information of at least one AP After a few target AP, can also include：If at least one target AP does not include current service AP, and Centralized Controller exists It determines that the STA does not switch service AP in preset condition, then sends instruction message and indicate that current service AP sends releasing to the STA Association messages re-broadcast detection frame to trigger the STA.

Specifically, AC judges whether the STA currently has been established wireless connection according to the status information, if so, can root Choose at least one target AP according to the status information of at least one AP, and judge at least one target AP chosen whether AP including currently providing wireless service for the STA, if so, AC can not generate response policy, if it is not, then AC settings one are pre- If condition, so that the STA independently switches service AP according to own situation, if after reaching preset condition, which is not cut independently It changes, then AC instructions currently provide the AP releasings of wireless service and being associated with for the STA for the STA, and spy is re-broadcast to trigger the STA Frame is surveyed, and indicates that at least one target AP responds the detection frame.Wherein, which can include but is not limited to：It is default Set time or wireless media channel quality.For example, the preset condition can be a preset time period, it is more than the period Afterwards, which is not switched independently also, then enforces de-association；Or the preset condition can be that preset wireless medium is believed Road quality threshold, such as signal quality threshold value or packet loss threshold value, if being less than these threshold values, which does not carry out also certainly Main switching, then enforce de-association.This have the advantage that AC can dynamically adjust the load of wireless network, ensure nothing The load balancing of AP in gauze network, and ensure that the AP for providing service again is the AP of performance optimization.

The present embodiment is illustrated from two scenes below：

Scene one, STA do not set up wireless connection currently

Before STA accesses wireless network, broadcast detection frame is needed not returned directly after neighbouring AP receives the detection frame Probe response, but status information can be sent to AC.AC receives the status information that at least one AP is sent, which can To be that AP is sent to AC after the detection frame for receiving STA transmissions.

AC is chosen for the target AP that STA provides wireless service according to status information is received, and generates response policy.Its In, the response policy is consistent with the above, and selection process is also similar to the above, and details are not described herein again.And target AP can be One, or it is multiple, it can be chosen according to actual conditions.

AC sends response policy at least one AP, so that the target AP of selection responds the detection frame, to indicate the STA One is selected as service AP from those targets AP, is established and is wirelessly connected.

The currently-established wireless connection of scene two, STA

When STA has accessed wireless network, AC receives the status information that at least one AP is sent, which can be AP Periodicity or event triggering property are sent to AC's.

AC is chosen for the target AP that STA provides wireless service according to status information is received, and generates response policy.Its In, the response policy is consistent with the above, and selection process is also similar to the above, and details are not described herein again.And target AP can be It is multiple, this have the advantage that, since AC can not predict STA randomnesss on the move in real time, in order to ensure that STA being capable of root It is rapidly switched to target AP according to the system mechanism of itself, multiple selectable target AP are provided, to prevent because updating not in time The problem of caused network insertion handoff, improves the compatibility and fault-tolerance of network insertion.

AC sends response policy at least one AP, so that target AP is when receiving the detection frame of STA broadcast Send probe response to the STA, select to indicate the STA from the target AP target AP as new service AP, with into Service AP switchings in row wireless network, complete the roaming in wireless network or are associated with again.

Fig. 2 is the flow chart of the selection method embodiment two of access point of the present invention, base of the present embodiment in above-described embodiment On plinth, after S101, can also include：Centralized Controller determines whether the list item for being stored with the STA, if so, then according to the shape The list item of STA described in state information update；If nothing, the list item of the STA is generated according to the status information；The list item of the STA is used for Store the status information of the correspondence STA received；S102 may include：Centralized Controller is stored according to the list item of the STA Status information is chosen at least one target AP that the STA provides wireless service.This method can be applied not only to STA standards The case where standby access wireless network, the case where STA accessed networks can also be applied to, as shown in Fig. 2, this method can be according to Following flow carries out：

S201, Centralized Controller determine whether the list item for being stored with the STA, if so, then according to the state information updating institute State the list item of STA；If nothing, the list item of the STA is generated according to the status information；The list item of the STA is used to store to receive The status information of the corresponding STA.

It specifically, first can be from the table for the STA being locally stored after AC receives the status information that at least one AP is sent Item list is searched, to determine whether the list item of the STA is already present in the list, if so, according to the shape received The list item of the state information update STA, in case AC chooses at least one target AP according to the list item of newest STA；If it is not, then root The list item of the STA is created according to the status information, in case AC directly updates the table when receiving status information relevant with the STA again , while in case AC chooses at least one target AP according to the list item of newest STA.

Wherein, the list item list of the STA is created and is being locally stored by AC, with facilitate AC to the status information that receives into Row summarizes, and is conducive to the selection to target AP；The list item list of the STA may include the list item of multiple STA, the list item of each STA It may include the status information with the relevant each AP of the STA received.

The status information that S202, Centralized Controller are stored according to the list item of the STA is chosen for the STA and provides wireless service At least one target AP.

For example, AC is being waited for after a certain period of time, from the list item of the STA of the list item list records for the STA being locally stored, By calculating to load information and the quality information of channel and decision, which AP decisions allows as target AP echo probe frames, Which AP is not responding to detection frame.Wherein, the response policy is consistent with response policy above-mentioned, and details are not described herein again.

For example, when being chosen, in the list item of STA, there are the status informations of at least one AP, first determine whether STA To the signal strength of AP, it is higher than the signal strength threshold value set, just thinks that this AP can be provided preferably wirelessly for STA Service, this part AP are participated in as preferred AP in further choose, and alternately AP participates in tactful judgement to remaining AP. In preferred AP, selects load low or load the detection frame for responding STA as target AP less than average value, if unexcellent AP is selected, then carries out identical selection in alternative AP.Final Response Decision is sent to each AP.

Specifically, S202 can be carried out according to following flow：

Step 1: Centralized Controller judges whether the STA has been established wireless connection according to the list item of the STA：If so, holding Row step 2；If it is not, thening follow the steps three.

Specifically, AC judges according to the list item of the STA wireless connection conditions current to STA first, with determination The response policy generated afterwards.

Step 2: Centralized Controller chooses at least one target AP according to the list item of the STA, and the response policy is generated, So that the STA independently carries out wireless network roaming or is associated with again.

Specifically, if judging, wireless connection has been established in the current STA, and AC chooses at least one according to the list item of the STA A target AP, and indicate that these targets AP returns to probe response in the detection frame for receiving the STA, so that the STA is therefrom selected The update that a target AP is selected as service AP to be wirelessly connected carries out wireless network roaming and is associated with again.In this way Doing is advantageous in that, the AP for carrying out wireless network switching is provided for STA, to realize demand that STA independently switches over AP, protects Compatibility has been demonstrate,proved, fault-tolerance is improved.

Step 3: Centralized Controller is chosen at least one target that the STA provides wireless service according to the list item of the STA AP, and generate the response policy.

Specifically, such as judge that the current STA does not set up wireless connection, then AC can choose more according to the list item of the STA The target AP of a best performance is wirelessly connected so that the STA therefrom selects service AP to establish, or one best performance of selection Target AP is wirelessly connected so that the STA is directly established with target AP.

Optionally, can also include after S202：If at least one target AP does not include current service AP, and concentrates control Device processed determines that the STA does not switch service AP in preset condition, then sends instruction message and indicate that current service AP is sent out to the STA Disassociation message is sent, detection frame is re-broadcast to trigger the STA.Specifically, AC is judging that the STA is currently-established wireless After connection, further, AC can choose at least one target AP according to the list item of the STA, and judge to choose this at least one Whether a target AP includes current service AP, if so, AC can not generate response policy, if it is not, then AC is in preset condition After the interior determination STA does not switch service AP independently, instruction current service AP releasings are associated with the STA's, to trigger STA weights New broadcast detection frame, and indicate that target AP responds the detection frame, ensure to re-establish the AP that associated AP is performance optimization.In this way Doing is advantageous in that, AC can dynamically adjust the load of wireless network, ensure the load balancing of wireless network.

The present embodiment is realized and is selected AP by the way that the list item list of the simultaneously STA of real-time update is locally created in Centralized Controller The dynamic adjustment selected, and real-time response policy is assigned, the loading condition of wireless network is optimized, and ensure that the compatibility of network Property.

It is illustrated so that the scene of wireless connection has been established in STA as an example below：

After each AP receives the detection frame of each STA, can periodicity or event triggering property to AC send status information, AC according to These status informations, establish or update the list item of each STA, and according to the list item list of each newer Refresh Data STA, for The STA of wireless connection is had built up, AC can judge whether STA is small in optimal service according to the channel quality condition of STA to AP Area（Provide whether the AP of wireless service is optimal）, judging herein can be using STA to the AP's in AP status informations Signal strength information, can also be according to AP uplink MCS packet distributed intelligences counted etc., no longer citing in detail herein.If STA is arrived The signal strength of AP is less than threshold value, then it is assumed that and this STA has been no longer on best server cell, checks the list item of STA at this time, Judged according to STA to AP signal strength thresholds, is higher than the preferred AP of conduct of threshold value（I.e. above-mentioned AP to be selected）, it is less than threshold value Alternately AP then can further judge the load state of preferred AP if there is preferred AP, can be used sequence and class mean It is compared or the mode compared with preset value, does not limit herein, the conduct target AP that load meets condition is selected, if do not had It is preferred that AP carries out AP sequences, only when the signal strength of alternative AP is persistently better than current service then in alternative AP with signal strength When AP, or be better than current AP signal strength add a signal strength biasing when, AP to be selected could be used as, if there is multiple The signal strength of alternative AP is all persistently better than current service AP, then the signal of these alternative AP need to be with the signal of strongest alternative AP It is compared, the alternative AP within the scope of certain signal strength variance can be used as AP to be selected, in these AP to be selected, carry out Load is compared, and sequence can be used, be compared with class mean or the mode compared with preset value, do not limit, finally select herein Target AP.

AC sends newest response policy to each AP, and the response policy of the target AP selected is echo probe, the sound of remaining AP Answer strategy to be not responding to, in this way, triggering terminal carries out service AP switchings, if terminal can further allow without switching Current service AP and STA disassociations, triggering STA broadcasts new detection frame, because STA can only have found selected target in network AP, therefore STA can only be associated with target AP, achieve the purpose that the service AP for guiding STA to switch to selection.Because of target AP combines channel circumstance and load synthesis is elected, so by switching, the load reached between allowing AP is more balanced Purpose.

Fig. 3 is the flow chart of the selection method embodiment three of access point of the present invention, as shown in figure 3, this method can be according to Following flow carries out：

S301, AP receive the response message for carrying response policy that Centralized Controller is sent, which is to concentrate Controller is sent to the AP after the status information for receiving AP transmissions, which, which is used to indicate, receives the sound The detection frame of at least one of AP of message targets AP response STA broadcast, other AP is answered to be not responding to the detection of STA broadcast Frame；At least one target AP is that Centralized Controller is chosen according to the status information that at least one AP is sent, state letter Breath includes the load information for the AP for sending the status information.

Specifically, which may include the load information of AP.The load information of the AP is for reflecting that the AP is current Load condition, may include the current use duty ratios of the AP, association user number, concurrent user number, the information such as flow its One of or arbitrary combination；

Preferably, which can also include the quality information of channel between AP and STA, then at least one target AP is that AC chooses according to the quality information of channel between the load information and each AP and the STA of each AP at least one AP 's.The quality information of the channel is used to reflect the quality of communication channel at least one AP between each AP and the STA, can be with Include the uplink of each AP statistics in each AP at least one AP to the signal strength information of the STA and/or at least one AP MCS packet distributed intelligences.

Optionally, before S301, can also include：The AP sends the shape after the detection frame for receiving STA broadcast State information is to Centralized Controller；Or the AP periodicity or event triggering property send the status information to Centralized Controller, herein Do not do any restrictions.

Further, if the status information can be sent to AC by the AP periodicity or event triggering property, it will be able to realize AC To the dynamic control of wireless network, the loading condition of AP is adjusted in due course, optimizes the working condition of wireless network.

Wherein, which can be one, or it is multiple, it can be selected according to actual conditions It takes.

If S302, the AP have received the detection frame of STA broadcast, which is determined according to the response policy Mark whether AP includes the AP, if so, the detection frame is responded, so that the STA selects service AP from least one target AP；If It is no, it is not responding to the detection frame.

Specifically, the AP according to response policy judgement received itself whether be at least one target AP wherein it One, if so, the then echo probe frame after the detection frame for receiving STA, so that the STA can be found that the AP, so that the STA can Selection is established with the AP and is wirelessly connected.If judgement itself is not included at least one target AP, which is receiving this It is not responding to the detection frame when detection frame of STA broadcast.

The present embodiment, AP receives the response message for carrying response policy, and determines whether to respond according to the response policy The detection frame of STA broadcast, realizes the optimality and high efficiency of AP selections, ensure that the load balancing of wireless network, solve The problem of AP efficiencies of selection are not high and AP selections not enough optimize.Meanwhile in the present embodiment, when due to AC being to AP echo probe frames The control done, compared with the existing technology in AP respond association request control for, reduce user network insertion wait for Time.

Optionally, the present embodiment on the basis of the above embodiments, can also include：The AP receives Centralized Controller and sends Instruction message, to the STA send disassociation message, re-broadcast detection frame to trigger the STA, the instruction message be concentrate It includes current service AP that controller, which determines at least one target AP not, and determines that the STA does not switch service in preset condition It is sent when AP.Specifically, which is current service AP, should in preset condition if not including current service AP in target AP Also not autonomous switching service AP, the then instruction message that the AP is sent according to AC send disassociation message, with tactile to STA to the STA It sends out the STA and broadcasts new detection frame.

Fig. 4 is the flow chart of the selection method example IV of access point of the present invention, the present embodiment embodiment shown in Fig. 3 On the basis of, this method can also include before S301：The AP establishs or updates the response plan of the STA according to the response policy Slightly.Further, can also include after S301：The AP receives the detection frame of STA broadcast；The AP determines whether to be stored with this The response policy of STA sends the status information of the AP to Centralized Controller if nothing, so that Centralized Controller obtains the AP Status information, determine at least one target AP, and send the response message for carrying the response policy.As shown in figure 4, This method can be carried out according to following flow：

S401, the AP receive the detection frame of STA broadcast.

S402, the AP determine whether the response policy for being stored with the STA, if nothing, send the AP's to Centralized Controller Status information determines at least one target AP, and send and carry so that Centralized Controller obtains the status information of the AP The response message of the response policy.

Specifically, it is not but to be first checked for directly in response to the detection frame after AP receives the detection frame of STA broadcast Locally whether be stored with the response policy of the STA, if so, show to judge via Centralized Controller, directly according to Response policy determines whether to respond the detection frame；If not provided, just needing the status information of the relevant information including STA It is reported to AC, is judged by AC, that is, continues to execute S301.

S403, the AP establish or update the response policy of the STA according to the response policy.

The present embodiment first checks the local response plan for whether being stored with the STA by AP before the detection frame for receiving STA Slightly, it if so, directly handling the detection frame of the STA according to the response policy, is carried in Centralized Controller dynamic management wireless network The high access efficiency of wireless network.

Fig. 5 is the signaling process figure of the selection method embodiment five of access point of the present invention, and the present embodiment is not existed currently with STA It is established in wireless network in case of being wirelessly connected, while with wireless network by 3 AP（AP1, AP2 and AP3）For composition It illustrates, as shown in figure 5, this method can be carried out according to following flow：

S501, STA broadcast detection frame.

S502, AP1, AP2 and AP3 send status information to AC.

Can also include that AP1, AP2 and AP3 first check the local response plan for whether being stored with the STA before this step Slightly.Wireless connection was not established with the wireless network by STA in this present embodiment, so will not directly basis be locally stored Response policy directly handled.

S503, AC generate response policy according to status information.

In this step, AC can preset the reception of status information one acquisition time, after reaching acquisition time, just Start to calculate simultaneously decision, to generate response policy.For example, instruction AP1 responds the detection frame, AP2 and AP3 are not responding to detection frame.

S504, AC send the response message for carrying response policy to AP1, AP2 and AP3.

S505, AP1 send probe response to STA.

S506, STA send association request to AP1.

S507, AP1 send associated response to STA.

Fig. 6 is the signaling process figure of the selection method embodiment six of access point of the present invention, and the present embodiment has currently been existed with STA The case where being wirelessly connected is established in wireless network, for establishing wireless connection with AP2, while equally with wireless network by 3 A AP（AP1, AP2 and AP3）It is illustrated for composition, as shown in fig. 6, this method can be carried out according to following flow：

S601, AP1, AP2 and AP3 periodicity or event triggering property send status information.

S602, AC generate response policy according to status information.

In this step, AC chooses AP1, AP2 and AP3 according to the status information and is used as target AP, to trigger STA according to certainly Body situation chooses whether switching service AP；Or AC only chooses AP1 and AP3 as target AP, to trigger STA switching services AP.

Following steps are chosen AP1 and AP3 using AC and are illustrated as target AP.

S603, AC send the response message for carrying response policy to AP1, AP2 and AP3.

S604, STA broadcast detection frame.

In this step, STA can independently switch service AP, and frame is detected to wireless network broadcast.

S605, AP1 and AP3 send probe response to STA.

In this step, AP1, AP2 and AP3 first determine whether the local response policy for whether storing the STA, can be with according to S603 Show that AP1, AP2 and AP3 are locally stored with the response policy of the STA.

Since the AP2 response policies being locally stored are to be not responding to, then AP2 is failure to actuate.

S606, STA releasing are associated with AP2's.

Optionally, before this step, if STA carries out wireless network roaming, without this step；If STA prepares disconnected Wireless connection is opened, is accessed again again later, then executes this step.

S607, STA send association request to AP1.

In this step, STA selects AP1 as service AP by judging.

S608, AP1 send associated response to STA.

Optionally, in the present embodiment, AC also can judge choosing according to the status information that periodicity or event triggering property receive Whether the target AP taken and the current AP that wireless service is provided for STA are consistent, if it is not, decision making response plan can be first passed through Slightly, instruction one or more target AP responds the detection frame that the STA will be broadcasted, if the STA attonitys within a certain period of time, The roaming that is not wirelessly connected independently or without association service AP again, can indicate the AP that service is provided release with The association of the STA sends detection frame, to re-establish association to trigger the STA.

Fig. 7 is the structural schematic diagram of Centralized Controller embodiment one of the present invention, as shown in fig. 7, the Centralized Controller can be with Including：First receiving module 71, processing module 72 and sending module 73.Wherein, which can be used for receiving The status information that at least one access point AP is sent, the status information may include the load letter for the AP for sending the status information Breath；The processing module 72 can be used for being chosen for the STA according to the status information that first receiving module 71 receives providing At least one target AP of wireless service；The sending module 73 can be used for managing according to this selection of module 72 this is at least one Target AP sends the response message for carrying response policy at least one AP, and it is at least one which is used to indicate this The detection frame of target AP response STA broadcast, other AP are not responding to the detection frame of STA broadcast, so that the STA is at least one from this Selection service AP in target AP.

Optionally, which can be also used for：If the status information can also include sending the status information Between AP and the STA when quality information of channel, according to the load information of each AP at least one AP and each AP and the STA it Between channel quality information, be chosen for the STA provide wireless service at least one target AP.

Optionally, which can be also used for：In the status information according at least one AP, it is chosen for STA After at least one target AP that wireless service is provided, if at least one target AP does not include current service AP, and default It determines that the STA does not switch service AP in condition, then sends instruction message and indicate that current service AP sends disassociation to the STA Message re-broadcasts detection frame to trigger the STA.

Optionally, which can be also used for：After receiving the status information that at least one AP is sent, determination is The no list item for being stored with the STA, if nothing, is believed if so, then according to the list item of the state information updating STA according to the state Breath generates the list item of the STA；The list item of the STA is used to store the status information of the correspondence STA received；According to the STA's The status information of list item storage is chosen at least one target AP that the STA provides wireless service.

The device of the present embodiment can be used for executing the technical solution of embodiment of the method shown in Fig. 1 and Fig. 2, specific work( Above method embodiment can be referred to, details are not described herein again.

The Centralized Controller of the present embodiment, the shape sent according to each AP that the first receiving module receives by processing module State information is determined as at least one target AP that STA provides wireless service, and carries sound to each AP transmissions by sending module The response message of strategy is answered, so that the detection frame of target AP responses STA, realizes the optimality and high efficiency of AP selections, ensure The load balancing of wireless network solves the problems, such as that AP efficiencies of selection are high and AP selections not enough optimization.

Fig. 8 is the structural schematic diagram of AP apparatus embodiments one of the present invention, as shown in figure 8, the AP equipment may include：Second Receiving module 81 and respond module 82.Wherein, which can be used for receiving the carrying that Centralized Controller is sent There is the response message of response policy, which is that Centralized Controller is sent to this after the status information for receiving AP transmissions AP's, which, which can serve to indicate that, receives the AP response STA broadcast of at least one of AP of response message targets Detection frame, other AP be not responding to the STA broadcast the detection frame；At least one target AP is Centralized Controller according at least The status information that one AP is sent is what the STA chose, which may include the load for the AP for sending the status information Information；；If the respond module 82 can be used for having received the detection frame of STA broadcast, being determined according to the response policy should Whether at least one target AP includes the AP, if so, the detection frame is responded, so that the STA is selected from least one target AP Select service AP；If it is not, being not responding to the detection frame.

Optionally, which can also include the quality letter of channel between the AP and the STA for sending the status information Breath；Then at least one target AP be Centralized Controller according to the status information that at least one AP is sent can wrapping for choosing It includes：At least one target AP is Centralized Controller according to the load information of each AP at least one AP and each AP and STA Between channel quality information be the STA choose.

Optionally, which can be also used for：It receives the Centralized Controller and sends instruction message, sent out to the STA Disassociation message is sent, detection frame is re-broadcast to trigger the STA, which can be that Centralized Controller determines this at least One target AP does not include current service AP, and determines in preset condition and sent when the STA does not switch service AP.

The device of the present embodiment can be used for executing the technical solution of embodiment of the method shown in Fig. 3 and Fig. 4, specific work( Above method embodiment can be referred to, details are not described herein again.

The AP equipment of the present embodiment is received the response message for carrying response policy by the second receiving module, and passed through Strategy determines whether to respond the detection frame of STA broadcast respond module according to response, realizes the optimality and high efficiency of AP selections, The load balancing that ensure that wireless network solves the problems, such as that AP efficiencies of selection are not high and AP selections not enough optimize.

Fig. 9 is the structural schematic diagram of Centralized Controller embodiment two of the present invention, as shown in figure 9, the Centralized Controller can be with Including：Receiver 91, processor 92 and memory 93, wherein：The receiver 91 can be used for receiving what at least one AP was sent Status information, the status information may include the load information for the AP for sending the status information；The memory 93 can be stored with Batch processing code, the processor 92 can call the program code, to execute following operation：According to the shape of at least one AP State information is chosen at least one target AP that STA provides wireless service, and response policy is carried at least one AP transmissions Response message, the response policy can serve to indicate that at least one target AP respond the STA broadcast detection frame, other AP It is not responding to the detection frame of STA broadcast；So that the STA selects service AP from least one target AP.The memory 93 is also It can be used for storing the response policy.

Optionally, which can also include the quality letter of channel between the AP and the STA for sending the status information Breath.

The Centralized Controller of the present embodiment, the shape sent according to each AP that the first receiving module receives by processing module State information is determined as at least one target AP that STA provides wireless service, and carries sound to each AP transmissions by sending module Answer strategy response message so that at least one target AP response STA detection frame, realize AP selection optimality and efficiently Property, it ensure that the load balancing of wireless network, solve the problems, such as that AP efficiencies of selection are not high and AP selections not enough optimize.

Figure 10 is the structural schematic diagram of AP apparatus embodiments two of the present invention, and as shown in Figure 10, which may include：It connects Receive device 101 and processor 102.Wherein, the receiver 101 can be used for receive Centralized Controller send carry response policy Response message, the response policy can be used for receive Centralized Controller send the response message for carrying response policy, should Response message is that Centralized Controller is sent to the AP after the status information for receiving AP transmissions, which is used to indicate The detection frame of at least one of AP of response message targets AP response STA broadcast is received, it is wide that other AP are not responding to the STA The detection frame broadcast；It is the STA that at least one target AP, which is Centralized Controller according to the status information that at least one AP is sent, It chooses, which includes the load information for the AP for sending the status information；If the processor 102 can be used for having received The detection frame broadcasted to the STA then determines whether at least one target AP includes the AP, if so, ringing according to the response policy Frame should be detected, so that the STA selects service AP from least one target AP；If it is not, being not responding to the detection frame.

In several embodiments provided by the present invention, it should be understood that disclosed device and method can pass through it Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only Only a kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component can be tied Another system is closed or is desirably integrated into, or some features can be ignored or not executed.Another point, it is shown or discussed Mutual coupling, direct-coupling or communication connection can be the INDIRECT COUPLING or logical by some interfaces, device or unit Letter connection can be electrical, machinery or other forms.

The described unit illustrated as separating component may or may not be physically separated, as unit The component of display may or may not be physical unit, you can be located at a place, or may be distributed over more In a network element.Some or all of unit therein can be selected according to the actual needs to realize this embodiment scheme Purpose.

In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list The form that hardware had both may be used in member is realized, can also be realized in the form of hardware adds SFU software functional unit.

The above-mentioned integrated unit being realized in the form of SFU software functional unit can be stored in one and computer-readable deposit In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are used so that a computer Equipment（Can be personal computer, server or the network equipment etc.）Or processor（processor）It is each to execute the present invention The part steps of embodiment the method.And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory（Read- Only Memory, ROM）, random access memory（Random Access Memory, RAM）, magnetic disc or CD etc. it is various The medium of program code can be stored.

Those skilled in the art can be understood that, for convenience and simplicity of description, only with above-mentioned each function module Division progress for example, in practical application, can be complete by different function modules by above-mentioned function distribution as needed At the internal structure of device being divided into different function modules, to complete all or part of the functions described above.On The specific work process for stating the device of description, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.

Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution The range of scheme.

Claims

1. a kind of selection method of access point, which is characterized in that including：

Centralized Controller receives the status information that at least one access point AP is sent, and the status information includes sending the state The load information of the AP of information；

The Centralized Controller is chosen for work station STA and provides wireless service according to the status information of at least one AP At least one target AP；

The Centralized Controller sends the response message for carrying response policy at least one AP, and the response policy is used The detection frame of the STA broadcast is responded in instruction at least one target AP, other AP are not responding to the described of the STA broadcast Frame is detected, so that the STA selects service AP from least one target AP；

Wherein, the Centralized Controller is chosen for STA and provides wireless service extremely according to the status information of at least one AP After a few target AP, further include：

If at least one target AP include current service AP, and the Centralized Controller in preset condition determine described in STA does not switch service AP, then sends instruction message and indicate that the current service AP sends disassociation message to the STA, with It triggers the STA and re-broadcasts detection frame；

The status information further includes the quality information of channel between the AP and the STA for sending the status information；The letter The quality information in road includes the signal strength information of channel between each AP to the STA at least one AP, or, it is described extremely The uplink modulation and coding strategy MCS packet distributed intelligences of each AP statistics in a few AP.

2. according to the method described in claim 1, it is characterized in that, the Centralized Controller is according to the shape of at least one AP State information is chosen at least one target AP that STA provides wireless service, including：

The Centralized Controller is according to channel between the load information and each AP and the STA of each AP at least one AP Quality information is chosen at least one target AP that the STA provides wireless service.

3. method according to claim 1 or 2, which is characterized in that the status information is that at least one AP is connecing It is periodical to receive at least one AP that the Centralized Controller is sent to after the detection frame of STA broadcast or described Or event triggering property is sent to the Centralized Controller.

4. method according to any one of claims 1 to 3, which is characterized in that the Centralized Controller receives at least one After the status information that AP is sent, further include：

The Centralized Controller determines whether the list item for being stored with the STA, if so, then according to described in the state information updating The list item of STA；

If nothing, the list item of the STA is generated according to the status information；The list item of the STA is for storing pair received Answer the status information of the STA；

The Centralized Controller is chosen for STA provides wireless service at least one according to the status information of at least one AP A target AP, including：

The status information that the Centralized Controller is stored according to the list item of the STA is chosen for the STA and provides wireless service At least one target AP.

5. according to claim 2 to 4 any one of them method, which is characterized in that the Centralized Controller according to it is described at least The status information of one AP is chosen for the target AP that STA provides wireless service, including：

The Centralized Controller is according to the quality information of channel and pre- gating between each AP and the STA at least one AP Limit, determines AP to be selected；

The Centralized Controller chooses the minimum at least one AP of load as at least one target in the AP to be selected AP。

6. a kind of selection method of access point, which is characterized in that including：

Access point AP receives the response message for carrying response policy that Centralized Controller is sent, and the response message is the collection Middle controller is sent to the AP after receiving the status information that the AP is sent, and the response policy is used to indicate reception The detection frame of at least one of AP to response message target AP responsive operations station STA broadcast, other AP are not responding to institute State the detection frame of STA broadcast；At least one target AP is that the Centralized Controller is sent according at least one AP Status information is what the STA chose, and the status information includes the load information for the AP for sending the status information；

If the AP has received the detection frame of the STA broadcast, at least one mesh is determined according to the response policy Mark whether AP includes the AP, if so, the detection frame is responded, so that the STA is selected from least one target AP Service AP；If it is not, being not responding to the detection frame；

The AP receives the instruction message that the Centralized Controller is sent, and disassociation message is sent to the STA, to trigger It states STA and re-broadcasts detection frame, the instruction message is that the Centralized Controller determines that at least one target AP does not include Current service AP, and determine in preset condition and to be sent when the STA does not switch service AP；

7. according to the method described in claim 6, it is characterized in that, at least one target AP is the Centralized Controller root It is what the STA chose according to the status information that at least one AP is sent, including：

At least one target AP is the Centralized Controller according to the load information of each AP at least one AP and each The quality information of channel is what the STA chose between AP and the STA.

8. the method described according to claim 6 or 7, which is characterized in that the AP receives carrying for Centralized Controller transmission Before the response message of response policy, further include：

9. according to claim 6 to 8 any one of them method, which is characterized in that the AP receives what Centralized Controller was sent After the response message for carrying response policy, further include：

10. according to the method described in claim 9, it is characterized in that, AP reception Centralized Controller transmissions carry sound Before the response message for answering strategy, further include：

The AP receives the detection frame of the STA broadcast；

The AP determines whether the response policy for being stored with the STA, if nothing, sends the AP's to the Centralized Controller Status information determines at least one target AP, concurrently so that the Centralized Controller obtains the status information of the AP Send the response message for carrying the response policy.

11. a kind of Centralized Controller, which is characterized in that including：

First receiving module, the status information sent for receiving at least one access point AP, the status information include sending The load information of the AP of the status information；

Processing module, the status information for being received according to first receiving module are chosen for work station STA and provide nothing At least one target AP of line service；

Sending module, at least one target AP for being chosen according to the processing module are sent at least one AP The response message of response policy is carried, it is wide that the response policy is used to indicate at least one target AP responses STA The detection frame broadcast, other AP are not responding to the detection frame of STA broadcast, so that the STA is from least one target Selection service AP in AP；

The processing module is additionally operable to：In the status information according at least one AP, it is chosen for STA and wireless service is provided After at least one target AP, if at least one target AP does not include current service AP, and institute is determined in preset condition It states STA and does not switch service AP, then send instruction message and indicate that the current service AP sends disassociation message to the STA, Detection frame is re-broadcast to trigger the STA；

12. Centralized Controller according to claim 11, which is characterized in that the processing module is additionally operable to：If the shape When state information further includes the quality information of channel between the AP and the STA for sending the status information, according to described at least one In a AP between the load information of each AP and each AP and the STA channel quality information, be chosen for the STA and wireless clothes be provided At least one target AP of business.

13. Centralized Controller according to claim 11 or 12, which is characterized in that the processing module is additionally operable to：It receives After the status information that at least one AP is sent, it is determined whether the list item of the STA is stored with, if so, then according to the state The list item of STA described in information update generates the list item of the STA according to the status information if nothing；The list item of the STA Status information for storing the correspondence STA received；According to the status information that the list item of the STA stores, it is chosen for The STA provides at least one target AP of wireless service.

14. a kind of access point apparatus, which is characterized in that including：

Second receiving module, the response message for carrying response policy for receiving Centralized Controller transmission, the response disappear Breath is that the Centralized Controller is sent to the AP, the response policy after receiving the status information that access point AP is sent It is used to indicate the detection frame of at least one of AP for receiving response message target AP responsive operations station STA broadcast, His AP is not responding to the detection frame of the STA broadcast；At least one target AP is the Centralized Controller according at least One AP send status information be the STA choose, the status information include sends the status information AP bear Information carrying ceases；

Respond module, if the detection frame for having received STA broadcast, according to the response policy determine described at least Whether one target AP includes the AP, if so, respond the detection frame, so that the STA is from least one target AP Middle selection services AP；If it is not, being not responding to the detection frame；

The respond module is additionally operable to：

The instruction message that the Centralized Controller is sent is received, disassociation message is sent to the STA, to trigger the STA Detection frame is re-broadcast, the instruction message is that the Centralized Controller determines at least one target AP not including current clothes Be engaged in AP, and determines in preset condition and to be sent when the STA does not switch service AP；

15. access point apparatus according to claim 14, which is characterized in that at least one target AP is the concentration Controller is chosen according to the status information that at least one AP is sent, including：

16. a kind of Centralized Controller, which is characterized in that including receiver, processor and memory, wherein：

The receiver is used to receive the status information that at least one access point AP is sent, and the status information includes described in transmission The load information of the AP of status information；

The memory is stored with batch processing code, and the processor calls said program code, to execute following operation：Root According to the status information of at least one AP, it is chosen at least one target AP that work station STA provides wireless service, to described At least one AP sends the response message for carrying response policy, and the response policy is used to indicate at least one target AP The detection frame of the STA broadcast is responded, other AP are not responding to the detection frame of the STA broadcast；So that the STA is from described Selection service AP at least one target AP；

The memory is additionally operable to store the response policy；

The processor is additionally operable to：In the status information according at least one AP, it is chosen for STA and provides wireless service extremely After lacking a target AP, if at least one target AP does not include current service AP, and in preset condition described in determination STA does not switch service AP, then sends instruction message and indicate that the current service AP sends disassociation message to the STA, with It triggers the STA and re-broadcasts detection frame；

17. a kind of access point apparatus, which is characterized in that including：

Receiver, the response message for carrying response policy for receiving Centralized Controller transmission, the response message is institute It states Centralized Controller and is sent to the AP after receiving the status information that access point AP is sent, the response policy is for referring to Show the detection frame of at least one of AP for receiving response message target AP responsive operations station STA broadcast, other AP are not Respond the detection frame of the STA broadcast；At least one target AP is the Centralized Controller according at least one AP The status information of transmission is what the STA chose, and the status information includes the load information for the AP for sending the status information；

Processor, if the detection frame for having received the STA broadcast, according at least one described in response policy determination Whether a target AP includes the AP, if so, the detection frame is responded, so that the STA is from least one target AP Selection service AP；If it is not, being not responding to the detection frame；

The processor is additionally operable to：The instruction message that the Centralized Controller is sent is received, sending disassociation to the STA disappears Breath, re-broadcasts detection frame, the instruction message is that the Centralized Controller determines at least one mesh to trigger the STA To mark AP include current service AP, and determines in preset condition and sent when the STA does not switch service AP；