CN104703234B - Access switching method and device in a kind of WLAN - Google Patents
Access switching method and device in a kind of WLAN Download PDFInfo
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- CN104703234B CN104703234B CN201310646299.3A CN201310646299A CN104703234B CN 104703234 B CN104703234 B CN 104703234B CN 201310646299 A CN201310646299 A CN 201310646299A CN 104703234 B CN104703234 B CN 104703234B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
Abstract
The present invention relates to fields of communication technology, more particularly to access switching method and device in a kind of WLAN, the loading condition of target AP is not accounted for when carrying out access and switching to solve STA in the prior art, the problem of easily causing the load imbalance between AP, even resulting in handover failure.Access switching method in the embodiment of the present invention includes：AC receives the handover measurement report of the STA of the source AP forwarding of STA access；The access information of the AC at least one neighborhood AP according to being reported the handover measurement and is determined, determines the target AP after the STA carries out access switching；Wherein, the access information includes load information；Indication message comprising the target AP is sent to the source AP by the AC, so that the indication message is transmitted to the STA by the source AP.
Description
Technical field
The present invention relates to the access switching methods and device in field of communication technology more particularly to a kind of WLAN.
Background technique
With WLAN（Wireless Local Area Networks, WLAN）Rapid development, WLAN is big
Numerous places such as building, enterprise have obtained large-scale deployment and application.
It mainly include access controller in the network architecture of WLAN（Access Controller, AC）, access point
（Access Point, AP）And user terminal（Station, STA）, wherein AP is communicated by Radio Link and STA, AP
Up direction is connect with AC by wire link；AC is responsible for managing AP and STA concentratedly, issues configuration information to AP, controls
The behavior of AP and STA processed, AP are responsible for completing workflow according to the configuration information of AC；When STA uses the networking telephone（Voice
Over Internet Protocol, VoIP）When equal real time business, how good business continuance is kept in moving process
Become extremely important.
In order to keep good business continuance in moving process, it is deteriorated when STA discovery is currently accessed AP signal quality
When, it can select to be switched to new AP；Between AP in a wlan in handover scheme, handoff procedure mainly include scanning, certification and again
Three processes are associated with, specially：STA scans ambient signals intensity, and according to the signal strength of each AP scanned, selection letter
Number optimal AP of quality is as the target AP after switching；STA sends authentication request message to AP is currently accessed, and manages the AC of the AP
Target AP will be transmitted in the authentication request message, later, by authentication request, authentication response, certification request, really
The process that this four steps complete exchange correlation security parameter is authenticated, and completes resource reservation in target AP；STA is to target AP
Reassociation requests are initiated, target AP responds the reassociation requests of STA, completes handoff procedure.
In the above scheme, STA is according to the signal strength selection target AP of each AP scanned, since there is no consider
To the loading condition of target AP, it is easy to cause the load imbalance between AP, even result in handover failure.
Summary of the invention
The embodiment of the present invention provides the access switching method and device in a kind of WLAN, to solve the prior art
Middle STA is in the loading condition for carrying out not accounting for target AP when access switching, it is easy to cause the load imbalance between AP, very
To the problem of leading to handover failure.
Access switching method in WLAN provided in an embodiment of the present invention, including：
Access controller AC receives the handover measurement report of the STA of the source access point AP forwarding of user terminal STA access
It accuses；Wherein, the link quality information of at least one neighborhood AP of the handover measurement report including the source AP；
The access information of the AC at least one neighborhood AP according to being reported the handover measurement and is determined, determines institute
It states STA and carries out the target AP after access switching；Wherein, the access information includes load information；
Indication message comprising the target AP is sent to the source AP by the AC, so that the source AP will be described
Indication message is transmitted to the STA.
Optionally, before the handover measurement that the AC receives the STA of the source AP forwarding is reported, further include：
The AC determines the identification information of at least one neighborhood AP of the source AP；
The AC will be determining described in the identification information of at least one neighborhood AP be sent to the source AP so that the STA
After the identification information for receiving at least one neighborhood AP described in the source AP forwarding, according at least one neighborhood AP's
Identification information initiates to measure at least one neighborhood AP.
Access switching method in a kind of WLAN provided in an embodiment of the present invention, including：
User terminal STA determines that handover measurement is reported；Wherein, the handover measurement report includes that the STA is currently accessed
Source access point AP at least one neighborhood AP link quality information,
User terminal STA sends handover measurement report to the source AP, so as to manage the access controller AC of the source AP
The access information of at least one neighborhood AP for the source AP for being reported and being determined according to the handover measurement, determines that the STA is cut
Target AP after changing, and the indication message comprising the target AP is sent to the source AP；The access information includes：It is negative
Information carrying breath；
The indication message comprising target AP that the STA is forwarded according to the source AP, is switched to the target AP.
Optionally, the STA determines that handover measurement is reported, including：
The STA receives the identification information at least one neighborhood AP that the source AP is sent；
The identification information of the STA at least one neighborhood AP according to, by being initiated at least one neighborhood AP
Measurement determines that handover measurement is reported.
A kind of access controller AC provided in an embodiment of the present invention, C include：
Receiving module, the handover measurement report of the STA of the source access point AP forwarding for receiving user terminal STA access
It accuses；Wherein, the link quality information of at least one neighborhood AP of the handover measurement report including the source AP；
Determining module, the access letter at least one neighborhood AP according to being reported the handover measurement and is determined
Breath, determines the target AP after the STA carries out access switching；Wherein, the access information includes load information；
Sending module, for will include that the indication message of the target AP is sent to the source AP, so that the source
The indication message is transmitted to the STA by AP.
A kind of user terminal STA provided in an embodiment of the present invention, including：
Determining module, for determining that handover measurement is reported；Wherein, the handover measurement report includes that the STA currently connects
The link quality information of at least one neighborhood AP of the source access point AP entered,
Sending module, for sending handover measurement report to the source AP, so as to manage the access controller of the source AP
The access information of at least one neighborhood AP for the source AP that AC is reported and determined according to the handover measurement, determines the STA
Target AP after switching, and the indication message comprising the target AP is sent to the source AP；The access information includes：
Load information；
Switching module, the indication message comprising target AP for being forwarded according to the source AP, is switched to the mesh
Mark AP.
In the embodiment of the present invention, handover measurement report reporting is given the source AP of access by STA, after source AP is transmitted to AC, by AC
The access information of the neighborhood AP for the source AP for being reported and being determined according to the handover measurement, determines that STA carries out the mesh after access switching
AP is marked, and target AP is indicated to STA；For the embodiment of the present invention since the control of switching has been handed to AC from STA, AC can
To select to switch for STA in conjunction with the access informations such as the report of the handover measurement of STA and the load information of neighborhood AP itself determined
Target AP afterwards selects suitable target AP to be accessed so as to fully consider the loading condition of neighborhood AP for STA.It adopts
The load between AP can be balanced with the embodiment of the present invention, improves handover success rate, and then switching flow can be saved, reduces network
Load.
Detailed description of the invention
Fig. 1 is the access switching method flow chart in the WLAN that the embodiment of the present invention one provides；
Fig. 2 is the extension message format schematic diagram for the probe response Probe Response frame that the embodiment of the present invention defines；
Fig. 3 is the message format schematic diagram for the handover measurement report that the embodiment of the present invention defines；
Fig. 4 is the message format schematic diagram for the indication message that the embodiment of the present invention defines；
Fig. 5 is the message format schematic diagram for the load information inquiry request that the embodiment of the present invention defines；
Fig. 6 is the message format schematic diagram for the load requests response message that the embodiment of the present invention defines；
Fig. 7 is the switching flow schematic diagram in the embodiment of the present invention；
Fig. 8 is the access switching method flow chart in WLAN provided by Embodiment 2 of the present invention；
Fig. 9 is the access switching flow schematic diagram in the embodiment of the present invention three；
It is AC structural schematic diagram provided in an embodiment of the present invention shown in Figure 10；
It is STA structural schematic diagram provided in an embodiment of the present invention shown in Figure 11.
Specific embodiment
The basic thought of the embodiment of the present invention is to weigh the switching control of access from STA to hand to AC, by AC combination STA's
The access informations such as handover measurement report and the load information of neighborhood AP determined to select the target after access switching for the STA
AP selects suitable target AP for STA, balances the load between AP, improve so as to fully consider the loading condition of neighborhood AP
Handover success rate.
The embodiment of the present invention is described in further detail with reference to the accompanying drawings of the specification.
As shown in Figure 1, the access switching method flow chart in the WLAN provided for the embodiment of the present invention one, including
Following steps：
S101：The switching that access controller AC receives the STA of the source access point AP forwarding of user terminal STA access is surveyed
Amount report；Wherein, the link quality information of at least one neighborhood AP of the handover measurement report including the source AP；
S102：The access information of the AC at least one neighborhood AP according to being reported the handover measurement and is determined,
Determine the target AP after the STA carries out access switching；Wherein, the access information includes：Load information；
S103：Indication message comprising the target AP is sent to the source AP by the AC, so that the source AP
The indication message is transmitted to the STA.
In the specific implementation process, STA can be currently accessed the link-quality of AP and the link of neighborhood AP with periodic scan
Quality can be lower than setting threshold value when the link-quality for being currently accessed AP is lower than setting threshold value, and/or in packet loss
When, handover measurement report is sent to the source AP of access, or periodically can send handover measurement report to source AP, source AP is connecing
After receiving handover measurement report, the report of received handover measurement is transmitted to AC, AC is determined involved in handover measurement report
The access informations such as the load information of neighborhood AP, according to the neighborhood AP's in the access information of determining neighborhood AP and measurement report
Link quality information determines the target AP after AP carries out access switching.
In traditional scheme, due to not considering the loading condition of target AP, when target AP number of users overload, it is easy to cause
Handover failure, meanwhile, because handover failure causes STA to need to re-initiate new switching flow again, to increase network side
Load, and the embodiment of the present invention can according to the loading condition selection target AP of neighborhood AP, so as to improve handover success rate,
Network load is reduced simultaneously；Furthermore in traditional scheme, due to not considering the loading condition of target AP, when the access band of target AP
When width is inadequate, the access rate of new access user not can guarantee, while can reduce the access rate of other users again, and it is of the invention
Embodiment, which can choose, loads the AP relatively light, access rate is secure as target AP, so as to balance AP in neighborhood
Between load, improve the cut-in quality of user.
Optionally, before the handover measurement that the AC receives the STA of the source AP forwarding is reported, further include：
The AC determines the identification information of at least one neighborhood AP of the source AP；
The AC will be determining described in the identification information of at least one neighborhood AP be sent to the source AP so that the STA
After the identification information for receiving at least one neighborhood AP described in the source AP forwarding, according at least one neighborhood AP's
Identification information initiates to measure at least one neighborhood AP.
In the specific implementation process, if AC does not indicate neighborhood AP to STA, STA just needs to scan each in all channels
A signal, sweep time is longer, and efficiency is lower, in order to improve the efficiency that STA determines handover measurement report, shortens STA and is cut
The time span for changing scanning reduces the power consumption of STA, and AC can be pre-configured with the neighborhood AP list of source AP in inside, by the column
Table is sent to source AP by network management or internal configuration interface, and during STA accesses WLAN, source AP passes through probe response
The extension field of Probe Response frame by neighborhood AP list notification to STA, so as to so that STA need to only be scanned passes through
The neighborhood AP that Probe Response frame is got, improves scan efficiency, furthermore, network design and construction are pre-configured in AC
The neighborhood AP information of stage planning can also provide the continuous covering of signal and be effectively ensured.
As shown in Fig. 2, the extension message format of the probe response Probe Response frame defined for the embodiment of the present invention
Schematic diagram, including frame head（MAC Header）, service set（SSID）, changeable AP list（HO APList）, it is changeable
AP list source identity（Element ID）, changeable AP list length（Length）, frame entity（Body）, frame it is real
Body includes：The source identity of frame entity（Element ID）, frame entity length（Length）, channel number（Channel x）, base
This service set（BSSID m…BSSID n）, wherein it may include one or more relevant unit in Body, one
Channel includes multiple BSSID, and mark of the BSSID as AP, i.e., there are multiple AP of same channel number in the neighborhood of source AP.
Optionally, the handover measurement report further includes the link quality information of the source AP；The AC receives the source
After the handover measurement report of the STA of AP forwarding, before the target AP after determining the STA switching, further include：The AC
According to the link quality information of the source AP, determine that the STA needs to carry out access switching；And/or
The handover measurement report further includes the type of the handover measurement report, and the type of the handover measurement report is
Periodical handover measurement report, or, the STA is determining the timely handover measurement report for needing to carry out to report after access switching；
After the AC receives the handover measurement report of the STA of source AP forwarding, target AP after determining the STA switching it
Before, further include：The AC determines the STA after determining that the type of the handover measurement report is the report of timely handover measurement
It needs to carry out access switching.
In the specific implementation process, STA can only report the link quality information of neighborhood AP in handover measurement report,
The link quality information for the source AP being currently accessed and the link quality information of neighborhood AP can be reported in handover measurement report, also
Can be reported in handover measurement report the link quality information of the source AP being currently accessed, the link quality information of neighborhood AP and
The type of handover measurement report；When STA only reports the link quality information of neighborhood AP in handover measurement report, AC can be
When receiving handover measurement report, that is, determine that the STA needs to carry out access switching, and according to the chain of the STA neighborhood AP reported
The access information of road quality information and the neighborhood AP of determination are STA selection target AP；When STA is reported in handover measurement report
When the link quality information of the source AP being currently accessed and the link quality information of neighborhood AP, AC can be according to the source AP that STA is reported
Link quality information judge whether the STA needs to carry out access switching, after determining that the STA needs to carry out access switching, root
According to handover measurement report in neighborhood AP link quality information and determination neighborhood AP access information be the STA selection target
AP；When STA reports the link quality information for the source AP being currently accessed, the link quality information of neighborhood AP in handover measurement report
When and handover measurement report type three when, AC can first look at the handover measurement report type, determining the switching
When the type of measurement report is that timely handover measurement is reported, it is determined that handover measurement report is that STA is currently accessed in discovery
Source AP link-quality is deteriorated, and carries out the handover measurement report reported when access switching, it is determined that the STA is accessed
Switching then needs further to check the switching when determining that the type of handover measurement report is reported for periodical handover measurement
The link quality information of source AP in measurement report, according to the link quality information of source AP further judge the STA whether needs
Carry out access switching.
In the specific implementation process, the mode that above-mentioned periodicity can be reported and be reported in time combines, in this way, this
Sample can guarantee the timeliness switched in STA and AC bilateral；In traditional handover scheme, only when the beacon of loss（Beacon）
Frame number reaches just triggering switching after given threshold n, and general n>5, therefore, using traditional approach, need to be switched to touching from determining
Handover delay is sent out in 500ms or more, and uses the embodiment of the present invention, STA can be determined according to current ink quality and be needed to cut
Handover measurement report is sent after changing immediately, greatly reduces handover delay.
As shown in figure 3, the message format schematic diagram of the handover measurement report defined for the embodiment of the present invention, including：Frame class
Type（Category）, subframe type（Action）, measurement report content（Measurement Report Elements）, measurement
The cell ID of report content（Element ID）, measurement report content length（Length）, handover measurement report type
（Type）, frame entity（Body）, frame entity include：Basic service set identification（BSSID）, channel number（Channel Id）, field
The signal strength of AP（RSSI）, neighborhood AP signal-to-noise ratio（SNR）, field AP makes an uproar at the bottom of the channel（SNF）；Wherein it is possible to will
Category is set as 0, represents the Action frame of spectrum management class；40 can be set by Action, may be set to be and appoint
One belongs to the handover measurement report newly defined with the existing unduplicated type of Action message, representative（Handover
Measurement Report）Frame type；Can set Type to 0 or 1, be expressed as the report of periodical handover measurement and
Timely handover measurement report；It may include one or more relevant unit in Body, respectively correspond different neighborhood AP's
Link quality information.
In the specific implementation process, when AC according to the handover measurement of STA report, determine that the STA needs to carry out access switching
Afterwards, the access information of the neighborhood AP of the link quality information and determination of neighborhood AP is the STA in being reported according to handover measurement
Selection target AP, and the mark of target AP is placed in indication message and is sent to STA；As shown in figure 4, real for the present invention
The message format schematic diagram for the indication message that example defines is applied, including：Frame type（Category）, subframe type
（Action）, switching instruction（Flag）, frame entity（Body）, frame entity includes：The source identity of frame entity（Element ID）,
The length of frame entity（Length）, target AP basic service set identification（BSSID）, target AP channel number（Channel
Id）, wherein 0 can be set by Category, represent the Action frame of spectrum management class；40 can be set by Action,
It may be set to be any and existing unduplicated type of Action message, represent the switching instruction for belonging to and newly defining
（Handover Indication）Frame type；Settable Flag value is 0 or 1, respectively indicates and needs to be implemented switching and do not need to hold
Row switching.
Optionally, the link quality information includes that signal strength, signal-to-noise ratio and bottom one of are made an uproar or a variety of.
In the specific implementation process, AC or STA can judge that the STA is according to any one of the above link quality information
No needs carry out access switching, for example, determining that the STA needs to carry out lower than after given threshold in the signal strength for determining source AP
Access switching, can also determine that target AP, AC can also comprehensively consider above-mentioned according to any one of the above link quality information
A variety of link quality informations, in short, determining the AP's when signal strength in a certain AP is weaker, noise is relatively low, bottom makes an uproar higher
Link-quality is poor.
Optionally, the AC determines the access information of any one neighborhood AP of the source AP according to following steps：
The AC is after determining the AP that any one neighborhood AP is managed by the AC, in the management information of the AC
The access information of any one neighborhood AP described in middle inquiry；Or,
The AC connects after determining the AP that any one neighborhood AP is managed by other AC to other AC transmissions
Enter information inquiring request, and receives the access information for any one neighborhood AP that other AC are sent.
In the specific implementation process, the switching of STA can be two layers of switching, i.e., from source AP be switched to it is same belonging to the AP of the source
Other AP under one AC management are also possible to three layers of switching, that is, the other AP being switched under other AC management, if two layers are cut
It changes, the AC of managed source AP can be directly in the access information of internal queries target AP, if three layers of switching, the AC of managed source AP is needed
Access information inquiry request is sent to other AC；In addition to this it is possible to using another mode, i.e.,：
The AC of managed source AP reports that successively inquiry manages the AC of changeable field AP according to the handover measurement that STA is sent,
Decide whether to be switched to neighborhood AP by managing the AC of changeable neighborhood AP, allows returning for switching receiving an AC
After multiple, then select the neighborhood AP under the AC as the target AP after switching.
Optionally, the load information includes one of following information or a variety of：
The quantity of the access STA of setting；
The quantity of practical access STA；
The STA access rate of setting；
The average access rate of practical access STA；
Central processor CPU occupancy.
In the specific implementation process, the neighborhood AP of source AP may include the neighborhood AP under above-mentioned AC management, it is also possible to including
Neighborhood AP under other AC management, for one of neighborhood AP, if the AP that neighborhood AP is managed for the AC, which can be with
The management information for directly inquiring itself determines the access information of neighborhood AP, if the AP that neighborhood AP is managed by other AC,
The AC can send access information inquiry request to other AC, and receive the access information that other AC are returned, access letter here
Breath includes load information；As shown in figure 5, the message format signal of the load information inquiry request defined for the embodiment of the present invention
Figure, including：IP head（IP Header）, load requests（Load Request）, the load information inquiry request message-length
（Length）, frame entity（Body）, frame entity include multiple basic service set identifications（BSSID1……BSSID n）, Ye Jiduo
The mark of a field AP；As shown in fig. 6, the message format signal of the load requests response message defined for the embodiment of the present invention
Figure, including：IP head（IP Header）, load response（Load Response）, the load requests response message message-length
（Length）, frame entity（Body）, frame entity include：The source identity of frame entity（Element ID）, frame entity length
（Length）, basic service set identification（BSSID）, setting access STA quantity（Set User Num）, practical access STA
Quantity（Fact User Num）, setting STA access rate（Set Rate）, practical access STA average access rate
（Fact Rate）, central processor CPU occupancy（CPU Rate）.
Optionally, in step S101, the access information further includes：Access bandwidth information；
The access information of the AC at least one neighborhood AP according to being reported the handover measurement and is determined, determines institute
It states STA and carries out the target AP after access switching, including：
The AC determines at least one according to the link quality information and load information of at least one neighborhood AP of the source AP
A first candidate target AP；
The AC according to the access bandwidth information of at least one first candidate target AP, from it is described at least one first
In candidate target AP, at least one second candidate target AP is determined；
The AC according to the link quality information of at least one second candidate target AP, from it is described at least one second
Target AP in candidate target AP, after determining the STA switching.
In the specific implementation process, in addition to above-mentioned link quality information and load information, AC can be combined with neighborhood AP's
Access bandwidth information determines the target AP after STA switching；Specifically, as shown in fig. 7, for the switching flow in the embodiment of the present invention
Schematic diagram；AC can determine the target AP after the STA switching according to following steps：
S701：AC receives the handover measurement report that STA is sent；
S702：AC judges whether the STA is connect according to the link quality information of source AP in handover measurement report
Enter switching；If so, entering step S703, otherwise, S708 is entered step；
S703：The AP list 1 that AC is obtained from the report of received handover measurement for switching（APlist1）；
S704：AC determines the load factor of each AP in APlist1, and obtains present load rate lower than setting from APlist1
The AP list 2 of threshold value（APlist2）；For example, given threshold can be set to 70%；
S705：AC based on the received handover measurement report in neighborhood AP link quality information, chain is selected from APlist2
Road mass parameter is greater than the AP list 3 of given threshold（APlist3）；Here link quality parameter can be signal strength, letter
Make an uproar than etc.；
S706：AC selects access bandwidth according to the access bandwidth information of AP each in determining APlist3 from APlist3
The optimal AP of mode forms APlist4；
S707：Handover measurement reports that the AP for selecting link-quality optimal from APlist4 is as STA to AC based on the received
Target AP after carrying out access switching, and it is indicated to STA；
S708：AC instruction STA does not need to carry out access switching.
Corresponding with the above-mentioned access switching method based on the side AC, following embodiment of the present invention provides connecing based on the side STA
Enter switching method, the principle that following embodiment solves the problems, such as is similar to the aforementioned embodiment, and overlaps will not be repeated.
As shown in figure 8, for the access switching method flow chart in WLAN provided by Embodiment 2 of the present invention, packet
It includes：
S801：User terminal STA determines that handover measurement is reported；Wherein, the handover measurement report includes the STA current
The link quality information of at least one neighborhood AP of the source access point AP of access；
S802：User terminal STA sends handover measurement report to the source AP, so as to manage the access control of the source AP
Device AC is reported according to the handover measurement and the access information of at least one neighborhood AP of the source AP of determination, described in determination
Target AP after STA switching, and the indication message comprising the target AP is sent to the source AP；The access information packet
It includes：Load information；
S803：The indication message comprising target AP that the STA is forwarded according to the source AP, is switched to the target
AP。
Optionally, in step S801, the STA determines that handover measurement is reported, including：
The STA receives the identification information at least one neighborhood AP that the source AP is sent；
The identification information of the STA at least one neighborhood AP according to, by being initiated at least one neighborhood AP
Measurement determines that handover measurement is reported.
Optionally, in step S802, the STA sends handover measurement report to the source AP, including：
The STA periodically sends handover measurement report to the source AP；And/or
The STA is in the link quality information according to the source AP, after determining that the STA needs to carry out access switching, to
The source AP sends handover measurement report.
Optionally, the link quality information includes that signal strength, signal-to-noise ratio and bottom one of are made an uproar or a variety of.
Below by a specific embodiment scheme that the embodiment of the present invention will be further explained；
As shown in figure 9, for the access switching flow schematic diagram in the embodiment of the present invention three, including：
S901：It is pre-configured with the neighborhood AP list of the source AP of STA access inside the AC of source, and passes through network management or internal configuration
Neighborhood AP list is sent to AP by interface；
Here, the neighborhood AP list of preconfigured source AP is pre-determined according to the network planning of WLAN inside the AC of source
Information specifically includes the routing iinformation of AP and its affiliated source AC, such as MAC Address, IP address etc..
S902：Source AP in STA during accessing WLAN, by the extension field of Probe Response by neighborhood AP list
It notifies to STA；
S903：The link-quality of STA periodic scan access link quality and field AP；When the access link quality of STA
Or after packet loss is lower than setting threshold value, which sends handover measurement report to source AP, or, the switching of STA periodicity sending is surveyed
Amount report；
S904：The handover measurement received report is transmitted to source AC by source AP；
S905：Source AC receives the handover measurement report of STA, according to the uplink downlink matter of STA in handover measurement report
Amount judges whether the STA needs to carry out access switching, if it is desired, enters step S906, otherwise enters step S907；
Here, AC needs in source are pre-configured with signal strength relevant to link-quality, signal-to-noise ratio and bottom and make an uproar threshold value, as cutting
The trigger condition changed.
S906：Source AC traverses the neighborhood AP list in handover measurement report, each in the AC internal queries list of source to be managed
The bandwidth license that the load information of the neighborhood AP of reason, user access, and/or, other neighborhood AC, which are sent, to other neighborhood AC is managed
The load information inquiry request of the neighborhood AP of reason, and receive the load information that other neighborhood AC are sent；
S907：Source AC permits according to the bandwidth of the load information, user's access inquiring or receive, reports in conjunction with STA
Handover measurement report, determines the target AP after the STA carries out access switching；
S908：Source AC issues to be switched target AP information to STA by AP；
S909：The information that STA is issued according to source AC initiates handoff procedure, specific switching flow reference to above-mentioned target AP
Existing IEEE 802.11r relevant regulations, which is not described herein again.
Based on the same inventive concept, it is additionally provided in the embodiment of the present invention a kind of corresponding with method that is accessing switching in WLAN
Access switching device（AC and STA）, the principle and the embodiment of the present invention that are solved the problems, such as due to the device of the embodiment of the present invention
The method for accessing switching is similar, therefore the implementation of the device may refer to the implementation of method, and overlaps will not be repeated.
It as shown in Figure 10, is AC structural schematic diagram provided in an embodiment of the present invention, including：
The switching of receiving module 101, the STA of the source access point AP forwarding for receiving user terminal STA access is surveyed
Amount report；Wherein, the link quality information of at least one neighborhood AP of the handover measurement report including the source AP；
Determining module 102, the access at least one neighborhood AP according to being reported the handover measurement and is determined
Information determines the target AP after the STA carries out access switching；Wherein, the access information includes load information；
Sending module 103, for will include that the indication message of the target AP is sent to the source AP, so that described
The indication message is transmitted to the STA by source AP.
Optionally, the determining module 102 is also used to, and receives cutting for the STA of the source AP forwarding in receiving module
It changes before measurement report, determines the identification information of at least one neighborhood AP of the source AP；
The sending module 103 is also used to, will be determining described at least one neighborhood AP identification information be sent to it is described
Source AP, so that the STA is after the identification information for receiving at least one neighborhood AP described in source AP forwarding, according to described
The identification information of at least one neighborhood AP initiates to measure at least one neighborhood AP.
Optionally, the handover measurement report further includes the link quality information of the source AP；The determining module 102 is also
For, after the handover measurement report that the receiving module 101 receives the STA of the source AP forwarding, the determining mould
Before block 102 determines the target AP after the STA switching, according to the link quality information of the source AP, the STA needs are determined
Carry out access switching；And/or
The handover measurement report further includes the type of the handover measurement report, and the type of the handover measurement report is
Periodical handover measurement report, or, the STA is determining the timely handover measurement report for needing to carry out to report after access switching；
The determining module 102 is also used to, and receives the handover measurement report of the STA of the source AP forwarding in the receiving module 101
After reporting to, before the determining module 102 determines the target AP after the STA switching, the handover measurement report is being determined
Type is after timely handover measurement is reported, to determine that the STA needs to carry out access switching.
Optionally, the determining module 102 is specifically used for determining any one neighborhood of the source AP according to following steps
The access information of AP：
After determining the AP that any one neighborhood AP is managed by the AC, inquired in the management information of the AC
The access information of any one neighborhood AP；Or,
After determining the AP that any one neighborhood AP is managed by other AC, access information is sent to other AC
Inquiry request, and receive the access information for any one neighborhood AP that other AC are sent.
Optionally, the link quality information includes that signal strength, signal-to-noise ratio and bottom one of are made an uproar or a variety of.
Optionally, the load information includes one of following information or a variety of：
The quantity of the access STA of setting；
The quantity of practical access STA；
The STA access rate of setting；
The average access rate of practical access STA；
Central processor CPU occupancy.
Optionally, the access information further includes：Access bandwidth information；The determining module 102 is specifically used for：According to institute
The link quality information and load information for stating at least one neighborhood AP of source AP determine at least one first candidate target AP；Root
According to the access bandwidth information of at least one first candidate target AP, from least one described first candidate target AP, really
At least one fixed second candidate target AP；According to the link quality information of at least one second candidate target AP, from described
Target AP at least one second candidate target AP, after determining the STA switching.
It as shown in figure 11, is STA structural schematic diagram provided in an embodiment of the present invention, which includes：
Determining module 111, for determining that handover measurement is reported；Wherein, the handover measurement report includes the STA current
The link quality information of at least one neighborhood AP of the source access point AP of access,
Sending module 112, for sending handover measurement report to the source AP, so as to manage the access control of the source AP
Device AC is reported according to the handover measurement and the access information of at least one neighborhood AP of the source AP of determination, described in determination
Target AP after STA switching, and the indication message comprising the target AP is sent to the source AP；The access information packet
It includes：Load information；
Switching module 113, the indication message comprising target AP for being forwarded according to the source AP are switched to described
Target AP.
Optionally, the determining module 111 is specifically used for：
Receive the identification information at least one neighborhood AP that the source AP is sent；According to the mark of at least one neighborhood AP
Know information, by initiating to measure at least one neighborhood AP, determines that handover measurement is reported.
Optionally, the sending module 112 is specifically used for：
Periodically handover measurement report is sent to the source AP；And/or
In the link quality information according to the source AP, after determining that the STA needs to carry out access switching, to the source AP
Send handover measurement report.
Optionally, the link quality information includes that signal strength, signal-to-noise ratio and bottom one of are made an uproar or a variety of.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
Usable storage medium（Including but not limited to magnetic disk storage, CD-ROM, optical memory etc.）The computer program of upper implementation produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, device（System）And the process of computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (20)
1. the access switching method in a kind of WLAN, which is characterized in that this method includes：
Access controller AC receives the handover measurement report of the STA of the source access point AP forwarding of user terminal STA access；Its
In, the link quality information of at least one neighborhood AP of the handover measurement report including the source AP；
The AC according to the handover measurement report and determine described at least one neighborhood AP access information, determine described in
STA carries out the target AP after access switching, including：The AC believes according to the link-quality of at least one neighborhood AP of the source AP
The load information that breath and the access information include, determines at least one first candidate target AP；The AC according to it is described at least
The access bandwidth information that the access information of one the first candidate target AP includes, from least one described first candidate target AP
In, determine at least one second candidate target AP；The link-quality of the AC at least one second candidate target AP according to
Information, the target AP from least one described second candidate target AP, after determining the STA switching；
Indication message comprising the target AP is sent to the source AP by the AC, so that the source AP is by the switching
Instruction information is transmitted to the STA.
2. the method as described in claim 1, which is characterized in that the AC receives the switching of the STA of the source AP forwarding
Before measurement report, further include：
The AC determines the identification information of at least one neighborhood AP of the source AP；
The AC will be determining described in the identification information of at least one neighborhood AP be sent to the source AP so that the STA is connecing
After the identification information for receiving at least one neighborhood AP of the source AP forwarding, according to the mark of at least one neighborhood AP
Information is initiated to measure at least one neighborhood AP.
3. the method as described in claim 1, which is characterized in that the handover measurement report further includes the link matter of the source AP
Measure information；After the AC receives the handover measurement report of the STA of the source AP forwarding, after determining the STA switching
Before target AP, further include：The AC determines that the STA carries out access and cuts according to the link quality information of the source AP
It changes；And/or
The handover measurement report further includes the type of the handover measurement report, and the type of the handover measurement report is the period
Property handover measurement report, or, the STA is determining the timely handover measurement report for needing to carry out to report after access switching；It is described
After AC receives the handover measurement report of the STA of the source AP forwarding, before the target AP after determining the STA switching,
Further include：The AC determines the STA needs after determining that the type of the handover measurement report is the report of timely handover measurement
Carry out access switching.
4. the method as described in claim 1, which is characterized in that the AC determines that the source AP's is any one according to following steps
The access information of a neighborhood AP：
The AC is looked into the management information of the AC after determining the AP that any one neighborhood AP is managed by the AC
Ask the access information of any one neighborhood AP；Or,
The AC sends access letter after determining the AP that any one neighborhood AP is managed by other AC, to other AC
Inquiry request is ceased, and receives the access information for any one neighborhood AP that other AC are sent.
5. the method as described in claim 1, which is characterized in that the link quality information include signal strength, signal-to-noise ratio and
Bottom one of is made an uproar or a variety of.
6. the method as described in claim 1, which is characterized in that the load information includes one of following information or more
Kind：
The quantity of the access STA of setting；
The quantity of practical access STA；
The STA access rate of setting；
The average access rate of practical access STA；
Central processor CPU occupancy.
7. the access switching method in a kind of WLAN, which is characterized in that this method includes：
User terminal STA determines that handover measurement is reported；Wherein, the handover measurement report includes the source that the STA is currently accessed
The link quality information of at least one neighborhood AP of access point AP,
User terminal STA sends handover measurement report to the source AP so that manage the access controller AC of the source AP according to
The access information of at least one neighborhood AP of the handover measurement report and the source AP determined, after determining the STA switching
Target AP, and to the source AP send include the target AP indication message；The access information includes：Load letter
Breath and access bandwidth information, and manage the institute that the access controller AC of the source AP is reported and determined according to the handover measurement
The access information for stating at least one neighborhood AP of source AP, the target AP after determining the STA switching, including：The AC is according to institute
The link quality information and load information for stating at least one neighborhood AP of source AP determine at least one first candidate target AP；Institute
AC is stated according to the access bandwidth information of at least one first candidate target AP, from least one described first candidate target AP
In, determine at least one second candidate target AP；The link-quality of the AC at least one second candidate target AP according to
Information, the target AP from least one described second candidate target AP, after determining the STA switching；
The indication message comprising target AP that the STA is forwarded according to the source AP, is switched to the target AP.
8. the method for claim 7, which is characterized in that the STA determines that handover measurement is reported, including：
The STA receives the identification information at least one neighborhood AP that the source AP is sent；
The identification information of the STA at least one neighborhood AP according to, by initiating to measure at least one neighborhood AP,
Determine that handover measurement is reported.
9. the method for claim 7, which is characterized in that the STA sends handover measurement report, packet to the source AP
It includes：
The STA periodically sends handover measurement report to the source AP；And/or
The STA is in the link quality information according to the source AP, after determining that the STA needs to carry out access switching, to described
Source AP sends handover measurement report.
10. the method as described in claim 7~9 is any, which is characterized in that the link quality information include signal strength,
Signal-to-noise ratio and bottom one of are made an uproar or a variety of.
11. a kind of access controller AC, which is characterized in that the AC includes：
Receiving module, the handover measurement report of the STA of the source access point AP forwarding for receiving user terminal STA access；
Wherein, the link quality information of at least one neighborhood AP of the handover measurement report including the source AP；
Determining module, for the access information of at least one neighborhood AP according to being reported the handover measurement and is determined, really
The fixed STA carries out the target AP after access switching；Wherein, the access information includes load information and access bandwidth information；
And the determining module, believe specifically for the link quality information of at least one neighborhood AP according to the source AP with load
Breath, determines at least one first candidate target AP；According to the access bandwidth information of at least one first candidate target AP, from
In at least one described first candidate target AP, at least one second candidate target AP is determined；According to it is described at least one second
The link quality information of candidate target AP, the mesh from least one described second candidate target AP, after determining the STA switching
Mark AP；
Sending module, for will include that the indication message of the target AP is sent to the source AP, so that the source AP will
The indication message is transmitted to the STA.
12. AC as claimed in claim 11, which is characterized in that the determining module is also used to, and is received in the receiving module
Before the handover measurement report of the STA of the source AP forwarding, the mark letter of at least one neighborhood AP of the source AP is determined
Breath；
The sending module is also used to, will be determining described in the identification information of at least one neighborhood AP be sent to the source AP, with
Make the STA after the identification information for receiving at least one neighborhood AP described in the source AP forwarding, according to described at least one
The identification information of a neighborhood AP initiates to measure at least one neighborhood AP.
13. AC as claimed in claim 11, which is characterized in that the handover measurement report further includes the link matter of the source AP
Measure information；The determining module is also used to, and receives the handover measurement report of the STA of the source AP forwarding in the receiving module
After reporting to, before the determining module determines the target AP after STA switching, according to the link quality information of the source AP,
Determine that the STA needs to carry out access switching；And/or
The handover measurement report further includes the type of the handover measurement report, and the type of the handover measurement report is the period
Property handover measurement report, or, the STA is determining the timely handover measurement report for needing to carry out to report after access switching；It is described
Determining module is also used to, described after the handover measurement report that the receiving module receives the STA of the source AP forwarding
Before determining module determines the target AP after the STA switching, determining that the type of the handover measurement report is switching in time
After measurement report, determine that the STA needs to carry out access switching.
14. AC as claimed in claim 11, which is characterized in that the determining module is specifically used for determining institute according to following steps
State the access information of any one neighborhood AP of source AP：
After determining the AP that any one neighborhood AP is managed by the AC, in the management information of the AC described in inquiry
The access information of any one neighborhood AP；Or,
After determining the AP that any one neighborhood AP is managed by other AC, access information inquiry is sent to other AC
Request, and receive the access information for any one neighborhood AP that other AC are sent.
15. AC as claimed in claim 11, which is characterized in that the link quality information include signal strength, signal-to-noise ratio and
Bottom one of is made an uproar or a variety of.
16. AC as claimed in claim 11, which is characterized in that the load information includes one of following information or more
Kind：
The quantity of the access STA of setting；
The quantity of practical access STA；
The STA access rate of setting；
The average access rate of practical access STA；
Central processor CPU occupancy.
17. a kind of user terminal STA, which is characterized in that the STA includes：
Determining module, for determining that handover measurement is reported；Wherein, the handover measurement report includes what the STA was currently accessed
The link quality information of at least one neighborhood AP of source access point AP,
Sending module, for sending handover measurement report to the source AP, so as to manage the access controller AC root of the source AP
The access information of at least one neighborhood AP for the source AP for reporting and determining according to the handover measurement determines the STA switching
Target AP afterwards, and the indication message comprising the target AP is sent to the source AP；The access information includes：Load
Information and access bandwidth information, and the access controller AC of the management source AP reports and determination according to the handover measurement
The access information of at least one neighborhood AP of the source AP, the target AP after determining the STA switching, including：The AC according to
The link quality information and load information of at least one neighborhood AP of the source AP determines at least one first candidate target AP；
The access bandwidth information of the AC at least one first candidate target AP according to, from least one described first candidate target
In AP, at least one second candidate target AP is determined；The link matter of the AC at least one second candidate target AP according to
Information is measured, the target AP from least one described second candidate target AP, after determining the STA switching；
Switching module, the indication message comprising target AP for being forwarded according to the source AP, is switched to the target AP.
18. STA as claimed in claim 17, which is characterized in that the determining module is specifically used for：
Receive the identification information at least one neighborhood AP that the source AP is sent；Believed according to the mark of at least one neighborhood AP
Breath determines that handover measurement is reported by initiating to measure at least one neighborhood AP.
19. STA as claimed in claim 17, which is characterized in that the sending module is specifically used for：
Periodically handover measurement report is sent to the source AP；And/or
In the link quality information according to the source AP, after determining that the STA needs to carry out access switching, sent to the source AP
Handover measurement report.
20. the STA as described in claim 17~19 is any, which is characterized in that the link quality information include signal strength,
Signal-to-noise ratio and bottom one of are made an uproar or a variety of.
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| CN105357708B (en) * | 2015-10-10 | 2019-07-19 | 上海斐讯数据通信技术有限公司 | A kind of website determines the methods, devices and systems of association access point |
| CN105809924B (en) * | 2016-03-09 | 2019-08-06 | 吉林大学 | A kind of microseism Fracturing Monitoring real-time transmission system |
| CN107801218B (en) * | 2016-09-06 | 2021-02-12 | 华为技术有限公司 | Control method and device for aggregating frames in access point switching |
| CN106851728B (en) * | 2017-02-20 | 2020-09-18 | 上海斐讯数据通信技术有限公司 | Load balancing method and device based on wired port and WDS wireless port |
| CN106658620B (en) * | 2017-03-06 | 2020-09-08 | 北京小米移动软件有限公司 | Method and device for switching access points |
| CN109219110A (en) * | 2017-06-29 | 2019-01-15 | 青岛恒金源电子科技有限公司 | The cut-in method of wireless device in a kind of intelligent hospital |
| CN107517486A (en) * | 2017-08-29 | 2017-12-26 | 深圳市盛路物联通讯技术有限公司 | Relay automatic routing method and device |
| EP3697134B1 (en) * | 2017-10-30 | 2022-10-26 | LG Electronics Inc. | Method for transmitting or receiving frame in wireless lan system and apparatus therefor |
| CN108235396A (en) * | 2018-01-02 | 2018-06-29 | 联想(北京)有限公司 | Wireless network access method and its electronic equipment |
| CN108924815A (en) * | 2018-06-20 | 2018-11-30 | 普联技术有限公司 | A kind of wireless roaming method and system |
| CN109451547B (en) * | 2018-12-21 | 2021-06-29 | 展讯通信（上海）有限公司 | Wireless roaming method and device, storage medium and access point equipment |
| CN110392397B (en) * | 2019-07-30 | 2022-06-17 | 烽火通信科技股份有限公司 | Method and system for switching between wireless Access Points (APs) |
| CN110913447B (en) * | 2019-12-30 | 2022-01-07 | Oppo广东移动通信有限公司 | Network control method, network control device, storage medium and electronic equipment |
| CN112188581B (en) * | 2020-09-09 | 2022-09-20 | 锐捷网络股份有限公司 | Wireless access point switching processing method, device, medium and equipment |
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