CN108924815A - A kind of wireless roaming method and system - Google Patents
A kind of wireless roaming method and system Download PDFInfo
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- CN108924815A CN108924815A CN201810640130.XA CN201810640130A CN108924815A CN 108924815 A CN108924815 A CN 108924815A CN 201810640130 A CN201810640130 A CN 201810640130A CN 108924815 A CN108924815 A CN 108924815A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/08—Mobility data transfer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
Abstract
The invention discloses a kind of wireless roaming method and system, the method includes：When needing to roam with the associated client of this AP, channel to be measured is determined according to local neighbor table；The local neighbor table is updated after the neighborhood that this AP receives control centre's transmission；The neighborhood is sent to corresponding AP after being updated according to the information received to total neighbours by the control centre；Channel measurement request is sent to client according to the channel to be measured, so that client measures the channel to be measured to obtain the signal quality of the AP on the channel to be measured and return measurement result；Roaming purpose AP is determined according to the measurement result；It sends roaming to client according to the roaming purpose AP to suggest, so that client suggests carrying out respective handling according to the roaming.The present invention can not be by scanning mutually detection and scanning the problem of influencing working performance between being able to solve AP, and improves roam speed.
Description
Technical field
The present invention relates to network technique field more particularly to a kind of wireless roaming method and systems.
Background technique
Radio roaming depends on 11k/v realization, wherein the neighbor report in 11k is for realizing AP neighbours
The transmission of relationship, plays central role in radio roaming.The mainstream realization side for the acquisition AP neighborhood that the prior art provides
Case is to scan to complete by AP, i.e. for an AP by periodically scanning, all of signal can be received by getting the AP
Other AP, and the identical AP of SSID is filtered out in these AP, as the neighbours of itself.
In the scheme that the prior art provides, the neighborhood for obtaining AP is scanned by AP, is primarily present following problems：
There are hidden node problems for first, AP scanning：When two AP have overlapping covered, but two AP can not be received
When to mutual air message (typical concealed nodes model), wherein any one AP can not scan another AP, because
This, when mobile device the two AP it is overlapping covered mobile when, comprehensive neighbor relation information cannot be provided to movement
Equipment.
There is influence performance issue in second, AP scanning：When one AP executes scan operation, all normal of the AP will be stopped
Communication behavior, i.e., the performance data of the AP is reduced to 0 during scanning, has seriously affected the working performance of AP, although wirelessly overflowing
You Zhong, in order to adapt to the variation of AP topology, AP scanning is disposed as periodical execution, but the working performance of each AP is still
It so will appear periodic bust.
Summary of the invention
The technical problem to be solved by the embodiment of the invention is that providing a kind of wireless roaming method and system, can solve
Certainly can not be by scanning mutually detection and scanning influence working performance between AP the problem of, and improve roam speed.
In order to solve the above-mentioned technical problem, the embodiment of the invention provides a kind of wireless roaming method, the method is by office
Each AP in the net of domain is executed respectively, including：
When needing to roam with the associated client of this AP, letter to be measured is determined according to preconfigured local neighbor table
Road；Wherein, the local neighbor table is updated after the neighborhood that this AP receives control centre's transmission；The neighbours are closed
System is sent to corresponding AP after being updated according to the information received to preconfigured total neighbours by the control centre；
Channel measurement request is sent to the client according to the channel to be measured, so that the client is according to
Channel measurement request the channel to be measured is measured with obtain the signal quality of the AP on the channel to be measured and to
This AP returns to corresponding measurement result；
Roaming purpose AP is determined according to the measurement result；
It sends roaming to the client according to the roaming purpose AP to suggest, so that the client is according to the roaming
It is recommended that carrying out respective handling.
Further, the neighborhood by the control centre according to the information received to preconfigured total
Neighbours are sent to corresponding AP after being updated, specifically include：
When any AP starting, generated according to the neighbor AP for meeting preset standard that all channel scanning obtains described local adjacent
Occupy table；
The neighbor table information for carrying the local neighbor table is sent to the control centre, so that control centre's root
The neighborhood in total neighbor table is updated according to the neighbor table information received and closes updated neighbours
System is sent to AP involved in update.
Further, the neighborhood by the control centre according to the information received to preconfigured total
Neighbours are sent to corresponding AP after being updated, specifically include：
Collect the client-entry that can receive signal；
The entry information for carrying the client-entry is sent to the control centre so that the control centre according to
The entry information received is updated the neighborhood in total neighbor table and sends out updated neighborhood
It send to AP involved in update；Wherein, the control centre obtains the neighborhood between AP to institute according to the entry information
The neighborhood stated in total neighbor table is updated.
Further, the method also includes：
The signal quality of monitoring and the associated all clients of this AP；
The signal quality of all clients is compared with preset threshold respectively；
Determine that signal quality needs to roam less than the client of the preset threshold.
Further, described that roaming purpose AP is determined according to the measurement result, it specifically includes：
According to the signal quality of each AP recorded in the measurement result, encryption side identical as the SSID of this AP is determined
The AP that formula is identical and signal quality is optimal is the roaming purpose AP.
Further, described that roaming suggestion is sent to the client according to the roaming purpose AP, so that the client
Suggested carrying out respective handling according to the roaming, be specifically included in end：
It sends the roaming to the client according to the roaming purpose AP to suggest, so that the client is according to
Roaming suggests that carrying out roaming processing or refusal handles and return to corresponding processing result.
Further, the method also includes：
Judge whether the client roams success according to the processing result；Wherein, the processing result includes roaming
Successful result and roaming failure result；
When the processing result is the roaming successful result, determine that the client roams successfully, and stops to institute
State the monitoring of the signal quality of client；
When the processing result is the roaming failure result, the client roaming failure is determined, and according to described
Measurement result determines that new roaming purpose AP is built to send new roaming to the client according to the new roaming purpose AP
View, so that the client carries out respective handling according to the new roaming suggestion.
In order to solve the above-mentioned technical problem, the embodiment of the invention also provides in a kind of radio roaming system, including control
The heart, at least two AP and at least one client；Wherein,
Each AP is for executing wireless roaming method described in any of the above embodiments；
The control centre is used to be updated preconfigured total neighbours according to the information received, and will be after update
Neighborhood be sent to corresponding AP；
The channel measurement request that the client is used to be sent according to the AP that receives to channel to be measured measure with
It obtains the signal quality of the AP on the channel to be measured and returns to corresponding measurement result；The client is also used to basis and connects
The roaming suggestion that the AP received is sent carries out respective handling.
Further, the control centre is also used to monitor the working condition of each AP, when the working condition of any AP is sent out
When changing, delete in total neighbor table the corresponding all information of variation AP with to the neighborhood in total neighbor table into
Row updates, and updated neighborhood is sent to corresponding AP.
Further, the control centre is also used to the functional configuration of AP；Wherein, the functional configuration includes at least SSID
Configuration and cipher mode configuration.
Compared with prior art, the embodiment of the invention provides a kind of wireless roaming method and systems, according to the local of AP
Neighbor table provides neighbor relation information for radio roaming, and local neighbor table is closed in the neighbours that AP receives control centre's transmission
It is updated after system, and neighborhood is sent to accordingly after being updated according to the information received to total neighbours by control centre
AP, be managed collectively by the neighborhood between all AP in control centre's local area network, be scanned without AP
Operation, being able to solve between AP can not be by scanning mutually detection and the problem of scanning influences working performance, and improves unrestrained
Swim speed.
Detailed description of the invention
Fig. 1 is a kind of flow chart of a preferred embodiment of wireless roaming method provided by the invention；
Fig. 2 is a kind of application scenarios schematic diagram of wireless roaming method provided by the invention；
Fig. 3 is a kind of structural schematic diagram of a preferred embodiment of radio roaming system provided by the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained all without creative efforts
Other embodiments shall fall within the protection scope of the present invention.
It is shown in Figure 1, it is a kind of flow chart of a preferred embodiment of wireless roaming method provided by the invention, institute
It states method to be executed respectively by each AP in local area network, including step S11 to step S14：
Step S11, when needing to roam with the associated client of this AP, according to preconfigured local neighbor table determine to
Measure channel；Wherein, the local neighbor table is updated after the neighborhood that this AP receives control centre's transmission；It is described
Neighborhood is sent to accordingly after being updated according to the information received to preconfigured total neighbours by the control centre
AP；
Step S12, channel measurement request is sent to the client according to the channel to be measured, so that the client
The channel to be measured is measured according to the channel measurement request to obtain the signal of the AP on the channel to be measured
Quality simultaneously returns to corresponding measurement result to this AP；
Step S13, roaming purpose AP is determined according to the measurement result；
Step S14, according to the roaming purpose AP to the client send roaming suggest so that the client according to
The roaming is suggested carrying out respective handling.
Specifically, when needing to roam into another AP in local area network with the associated client of this AP, this AP root first
Channel to be measured is determined according to preconfigured local neighbor table, wherein the letter that control centre sends according to each AP received
Breath is updated the neighborhood in preconfigured total neighbor table, and updated neighborhood is sent to involved by update
And AP, whenever this AP receive control centre transmission neighborhood when, to the neighborhood in the local neighbor table of this AP
Accordingly it is updated；Then, this AP generates corresponding measurement request according to determining channel to be measured and requests to send out by the measurement
Send to above-mentioned client, above-mentioned client after receiving measurement request, channel to be measured is measured with obtain to
The signal quality of the AP on channel is measured, and returns to corresponding measurement result to this AP；This AP is according to the measurement result received
The signal quality of each AP of middle record determines roaming purpose AP, then generates corresponding roaming according to determining roaming purpose AP
It is recommended that and the roaming suggestion is sent to above-mentioned client, above-mentioned client is after receiving the roaming and suggesting according to the roaming
It is recommended that carrying out respective handling.
It should be noted that describing the relevant information of all neighbor APs of this AP in the local neighbor table of this AP (such as neighbour
Occupy the information such as the SSID, cipher mode and working channel of AP), when determining channel to be measured, institute is determined according to local neighbor table
There is the neighbor AP for meeting roaming conditions (all the same with the SSID and cipher mode of this AP) in neighbor AP, meets roaming for all
For the working channel of the neighbor AP of condition as channel to be measured, channel to be measured includes at least the neighbours for meeting roaming conditions
The working channel of AP measures the working channel that all neighbor APs for meeting roaming conditions are then described in request, in client root
According to measurement request channel to be measured is measured to obtain the signal quality of the AP on channel to be measured when, can only obtain with
The signal quality of the identical AP of the SSID of this AP.
In addition, control centre can be a controller equiment, it is also possible to one and operates on PC that there is corresponding function
The software program of energy.
A kind of wireless roaming method provided by the embodiment of the present invention, by all AP in control centre's local area network it
Between neighborhood be uniformly managed, each AP only need with control centre carry out information exchange can obtain all neighbours
The relevant information of AP solves the problems, such as mutually detect by scanning between AP, being capable of the offer when client needs to roam
Comprehensive neighbor relation information, and since the updating maintenance of neighborhood work is completed by control centre and by updated neighbour
The relationship of residence is sent to AP involved in update, and AP is when receiving the neighborhood of control centre's transmission in local neighbor table
Neighborhood is accordingly updated, and without obtaining neighborhood by periodic scan operation, is being swept to solve AP
The problem of working performance reduces during retouching, ensure that the stability of AP working performance, and effectively improve roam speed, full
Foot requirement of real-time of the user to applications such as video, voices.
In a further advantageous embodiment, the neighborhood is by the control centre according to the information pair received
Preconfigured total neighbours are sent to corresponding AP after being updated, and specifically include：
When any AP starting, generated according to the neighbor AP for meeting preset standard that all channel scanning obtains described local adjacent
Occupy table；
The neighbor table information for carrying the local neighbor table is sent to the control centre, so that control centre's root
The neighborhood in total neighbor table is updated according to the neighbor table information received and closes updated neighbours
System is sent to AP involved in update.
Specifically, any one AP is on startup, can execute an all channel scanning can be swept with obtaining in current environment
All AP retouched, and then selection meets preset standard (with the SSID of this AP and encryption side from all AP that scanning obtains
Formula is all the same) AP generate local neighbor table as neighbor AP, and according to the relevant information of all neighbor APs；Then it will carry
The neighbor table information of the local neighbor table is sent to control centre, and control centre is according to the neighbor table information received, by the AP
As the neighbours of each AP in local neighbor table, the neighborhood in preconfigured total neighbor table is updated, and will
Updated neighborhood is sent to AP involved in update.
A kind of wireless roaming method provided by the embodiment of the present invention, AP only need to carry out single pass work on startup
Make, can will scan brought serious performance impact and minimize, and since scanning opportunity is when AP starts, when AP starts
It no longer needs to be scanned operation later, have no effect to the real work performance of AP.
In another preferred embodiment, the neighborhood is by the control centre according to the information pair received
Preconfigured total neighbours are sent to corresponding AP after being updated, and specifically include：
Collect the client-entry that can receive signal；
The entry information for carrying the client-entry is sent to the control centre so that the control centre according to
The entry information received is updated the neighborhood in total neighbor table and sends out updated neighborhood
It send to AP involved in update；Wherein, the control centre obtains the neighborhood between AP to institute according to the entry information
The neighborhood stated in total neighbor table is updated.
Specifically, the information that AP sends all clients in overlay area is monitored, by receiving client hair
The mode of message out collects all clients entry (including the associated client end entry and not associated that can receive signal
Client-entry), and the entry information for carrying all clients entry is sent to control centre, control centre is according to reception
The neighborhood between entry information building AP that each AP arrived is sent, to be closed to the neighbours in preconfigured total neighbor table
System is updated, and updated neighborhood is sent to AP involved in update.
In addition, when control centre constructs the neighborhood between AP according to the entry information received, first according to reception
To entry information judge whether there is at least two AP while sending identical client-entry, if so, then determine while sending
At least two AP of same client entry neighbours each other, and accordingly construct the neighborhood between above-mentioned at least two AP.
A kind of wireless roaming method provided by the embodiment of the present invention, using each AP to all clients in overlay area
The monitoring of information is sent, and all clients entry being collected into is sent in master controller and carries out aggregation process, to build
Neighborhood between vertical AP, thus can not be by scanning mutually detection, in addition, due to monitoring client between solving the problems, such as AP
One of the information originally action of AP sent is held, the information sent by monitoring client, for updating neighbor table
Information does not have the consumption of additional resource consumption, especially channel resource.
In another preferred embodiment, the method also includes：
The signal quality of monitoring and the associated all clients of this AP；
The signal quality of all clients is compared with preset threshold respectively；
Determine that signal quality needs to roam less than the client of the preset threshold.
Specifically, the signal quality of AP monitoring and the associated all clients of this AP is (according to the associated client received
Hold the signal quality at the available end of associated client of message sent), when the signal quality of client is lower than preset threshold,
Determine that the client is roamed.
A kind of wireless roaming method provided by the embodiment of the present invention is carried out by the signal quality to associated client end
Monitoring judges that the client needs to roam to carry out when the signal quality for monitoring any one client is less than preset threshold
Roaming processing, can make when the signal quality of client is too low on client initiative roaming to the preferable AP of signal quality, from
And it ensure that the communication quality of client.
It is described that roaming purpose AP is determined according to the measurement result in another preferred embodiment, it specifically includes：
According to the signal quality of each AP recorded in the measurement result, encryption side identical as the SSID of this AP is determined
The AP that formula is identical and signal quality is optimal is the roaming purpose AP.
Specifically, this AP AP according to corresponding to the signal quality of each AP recorded in measurement result, finds out and this AP
SSID and cipher mode AP all the same, then find out signal in the AP all the same with the SSID of this AP and cipher mode
The AP of optimal quality is as roaming purpose AP.
It is described that roaming suggestion is sent to the client according to the roaming purpose AP in another preferred embodiment,
So that the client suggests carrying out respective handling according to the roaming, specifically include：
It sends the roaming to the client according to the roaming purpose AP to suggest, so that the client is according to
Roaming suggests that carrying out roaming processing or refusal handles and return to corresponding processing result.
It should be understood that can be handled according to inherent logic, such as when the roaming that client receives AP transmission is suggested
Selection receives the roaming suggestion and directly roams on corresponding roaming purpose AP or refuse the roaming suggestion, and will locate accordingly
Reason result returns to AP.
Judge to roam whether purpose AP closes it should be noted that client be can do by myself after receiving roaming and suggesting
It fits, such as the IOS system of iPhone can provide back after the message for receiving suggestion roaming in conjunction with the statistical information of oneself
It is multiple.
In another preferred embodiment, the method also includes：
Judge whether the client roams success according to the processing result；Wherein, the processing result includes roaming
Successful result and roaming failure result；
When the processing result is the roaming successful result, determine that the client roams successfully, and stops to institute
State the monitoring of the signal quality of client；
When the processing result is the roaming failure result, the client roaming failure is determined, and according to described
Measurement result determines that new roaming purpose AP is built to send new roaming to the client according to the new roaming purpose AP
View, so that the client carries out respective handling according to the new roaming suggestion.
Specifically, managing whether result judges client according to this when AP receives the processing result of client return
It roams successfully, if receiving roaming successful result, then it is assumed that client roams successfully, no longer supervises to the state of client
Control；If receiving roaming failure result, then it is assumed that client roaming failure determines new roaming mesh according to above-mentioned measurement result
AP to send new roaming suggestion, the client new roaming that then basis receives to client according to new roaming purpose AP
It is recommended that carrying out respective handling.
Preferably, for roaming suggestion corresponding to the same roaming purpose AP, if client is receiving to be somebody's turn to do
Roaming failure, again for roaming purpose AP can carry out roaming processing after roaming is suggested, when client is to the roaming purpose
When AP repeatedly roam unsuccessfully, just the roaming suggestion according to corresponding to new roaming purpose AP carries out respective handling.
In addition, if client roaming failure, AP continues to attempt to that it is notified to be roamed, constantly try to failure for several times it
Afterwards, it kicks if opening pressure except function, the client is kicked in pressure to be removed.
It as shown in connection with fig. 2, is a kind of application scenarios schematic diagram of wireless roaming method provided by the invention, when AP1 starts
When, local neighbor table 1 is generated according to the AP all the same with the SSID and cipher mode of AP1 that all channel scanning obtains, and will
The neighbor table information for carrying local neighbor table 1 is sent to control centre, and similarly, AP2 and AP3 are swept according to all channel on startup
It retouches and respectively corresponds the local neighbor table 2 of generation and local neighbor table 3 and be sent to control centre.
Assuming that AP1 and AP2 have overlapping covered, neighbours each other, and can be by scanning mutually detection, if in AP1
AP2 has been started up before starting, will include the relevant information of AP2 in the local neighbor table 1 of AP1, if the AP1 before AP2 starting
It has been started up, will include the relevant information of AP1 in the local neighbor table 2 of AP2；The neighbour that control centre sends according to AP1 or AP2
Table information determines AP1 and AP2 neighbours each other, then updates the neighborhood between the AP1 and AP2 in summary table, and will be after update
Neighborhood be sent to AP1 and AP2, the neighborhood that AP1 and AP2 are then sent according to the control centre received is respectively to each
From local neighbor table in neighborhood be updated.
Assuming that AP1 and AP2 have overlapping covered a, neighbours each other, but can not be by scanning mutually detection, AP1 at this time
Local neighbor table 1 in do not have the relevant information of AP2, there will not be the relevant information of AP1, control in the local neighbor table 2 of AP2
Center processed when the neighbor table information sent according to each AP for receiving is updated the neighborhood in total neighbor table,
It is not in the neighbor relation information of AP1 and AP2.
Since AP1~AP3 information sent to all clients in overlay area is monitored, by receiving client
The mode of the message of sending collects all clients entry that can receive signal, and client 1 is located at covering for AP1 and AP2
In cover area, therefore, client 1 can not only detect AP1, but also can detect AP2, and control centre determines AP1 and AP2 each other
Neighbours construct the neighborhood between AP1 and AP2, are updated to the neighborhood in total neighbor table, and by updated neighbour
The relationship of residence is sent to AP1 and AP2；When AP1 receives the neighborhood of control centre's transmission to the neighbours in local neighbor table 1
Relationship is accordingly updated, and the relevant information of AP2 is added in local neighbor table 1；When AP2 receives the neighbour of control centre's transmission
The neighborhood in local neighbor table 2 is accordingly updated when occupying relationship, local neighbor table 2 is added in the relevant information of AP1
In；At this time include the relevant information of AP2 in the local neighbor table 1 of AP1, also includes the correlation of AP1 in the local neighbor table 2 of AP2
Information.
Assuming that client 1 is associated with AP1, AP1 monitors the signal quality of client 1, when the letter for monitoring client 1
Determine that client 1 needs to roam when number quality is less than preset threshold；AP1 determines channel to be measured according to local neighbor table 1, according to
Determining channel to be measured generates corresponding measurement request, and measurement request is sent to client 1；Client 1 is receiving
To after measurement request, channel to be measured is measured to obtain the signal quality of the AP on channel to be measured, and to AP1
Return to corresponding measurement result；AP1 AP according to corresponding to the signal quality of each AP recorded in measurement result, find out with
The AP that signal quality is optimal in the AP SSID and cipher mode of AP1 all the same is as roaming purpose AP, it is assumed that is determined is unrestrained
Trip purpose AP is AP2, then generates corresponding roaming according to AP2 and suggest, and the roaming suggestion is sent to client 1；Client 1
Respective handling is carried out according to the roaming suggestion after receiving the roaming and suggesting, it is assumed that client 1 receives the roaming suggestion simultaneously
It roams successfully, then returns to corresponding processing result to AP1；When AP1 determines according to the processing result that the client 1 received returns
When client 1 is roamed successfully, stopping is monitored the state of client 1.
It is shown in Figure 3 the present invention also provides a kind of radio roaming system, it is a kind of radio roaming provided by the invention
The structural schematic diagram of one preferred embodiment of system, including control centre 10, at least two AP20 and at least one client
End 30；Wherein,
Each AP20 is for executing wireless roaming method described in any of the above-described embodiment；
The control centre 10 is used to be updated preconfigured total neighbours according to the information received, and will update
Neighborhood afterwards is sent to corresponding AP20；
The client 30 is used to survey channel to be measured according to the channel measurement request that the AP20 received is sent
Amount is to obtain the signal quality of the AP20 on the channel to be measured and return to corresponding measurement result；The client 30 is also used
Respective handling is carried out in the roaming suggestion sent according to the AP20 received.
Specifically, the information that control centre sends according to each AP received is to the neighbour in preconfigured total neighbor table
The relationship of residence is updated, and updated neighborhood is sent to AP involved in update；When AP receives control centre's hair
When the neighborhood sent, the neighborhood in preconfigured local neighbor table is carried out more according to the neighborhood received
Newly；When needing to roam with the associated client of this AP, channel to be measured is determined according to the local neighbor table of this AP, and according to
It measures channel and sends channel measurement request to client；Client is treated according to the channel measurement request that this AP received is sent
Measurement channel is measured to obtain the signal quality of the AP on channel to be measured and return to corresponding measurement result to this AP；This
AP determines roaming purpose AP according to the signal quality of each AP recorded in measurement result, and according to roaming purpose AP to client
Roaming is sent to suggest；Client carries out respective handling according to the roaming suggestion that this AP received is sent.
A kind of radio roaming system provided by the embodiment of the present invention closes the neighbours between all AP by control centre
System one is managed, and each AP only needs to carry out information exchange to control centre that the related letter of all neighbor APs can be obtained
Breath solves the problems, such as that comprehensive neighbours can not can be provided when client needs to roam by scanning mutually detection between AP
Relation information, and since the updating maintenance of neighborhood work is completed by control centre and sends updated neighborhood
To related AP is updated, AP is when receiving the neighborhood of control centre's transmission to the neighborhood phase in local neighbor table
It should be updated, without obtaining neighborhood by periodic scan operation, work during scanning to solve AP
It the problem of reduced performance, ensure that the stability of AP working performance, and effectively improve roam speed.
In a further advantageous embodiment, the control centre is also used to monitor the working condition of each AP, as any AP
Working condition when changing, delete in total neighbor table the corresponding all information of variation AP in total neighbor table
Neighborhood be updated, and updated neighborhood is sent to corresponding AP.
Specifically, control centre monitors the working condition of each AP, when the working condition of any one AP changes, such as
When AP goes offline, power down, crash or configuration information change, it is corresponding all that the AP deletes in total neighbor table in control centre
Updated neighborhood to be updated to the neighborhood in total neighbor table, and is sent to the neighbour of the AP by relevant information
Occupy AP；When the AP restarts to work normally, control centre re-starts building to the neighborhood of the AP.
A kind of radio roaming system provided by the embodiment of the present invention, the work shape of each AP is monitored by control centre
State realizes the unified pipe of each AP neighborhood so that corresponding when the working condition of AP changes update neighbor relation information
Reason, so that the update operation of local neighbor table is more convenient quickly, AP is not necessarily to update neighborhood by periodically scanning, from
And solve the problems, such as that AP working performance during scanning reduces, it ensure that the stability of AP working performance, and fast to realize
Fast roaming service provides advantage.
In another preferred embodiment, the control centre is also used to the functional configuration of AP；Wherein, the functional configuration
Including at least SSID configuration and cipher mode configuration.
A kind of radio roaming system provided by the embodiment of the present invention, control centre also carry out other function to AP and match
It sets, configures identical SSID by all AP in local area network, to achieve the purpose that region overlay, and pass through control centre
Functional configuration effect can guarantee AP in neighbor table configuration information consistency, to realize that fast roaming service provides
Advantage.
To sum up, a kind of wireless roaming method and system provided by the embodiment of the present invention, makes full use of the system of control centre
One management role solves the problems, such as to provide when client needs to roam complete by scanning mutually detection between AP
The neighbor relation information in face, AP is not necessarily to obtain neighborhood by periodic scan operation, to solve AP in sweep time
Between working performance reduce the problem of, ensure that the stability of AP working performance, and effectively improve roam speed.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of wireless roaming method, which is characterized in that the method is executed respectively by each AP in local area network, including：
When needing to roam with the associated client of this AP, channel to be measured is determined according to preconfigured local neighbor table；Its
In, the local neighbor table is updated after the neighborhood that this AP receives control centre's transmission；The neighborhood by
The control centre is sent to corresponding AP after being updated according to the information received to preconfigured total neighbours；
Channel measurement request is sent to the client according to the channel to be measured, so that the client is according to the channel
Measurement request measures the channel to be measured to obtain the signal quality of the AP on the channel to be measured and to this AP
Return to corresponding measurement result；
Roaming purpose AP is determined according to the measurement result；
It sends roaming to the client according to the roaming purpose AP to suggest, so that the client is suggested according to the roaming
Carry out respective handling.
2. wireless roaming method as described in claim 1, which is characterized in that the neighborhood is by the control centre
It is sent to corresponding AP after being updated according to the information received to preconfigured total neighbours, is specifically included：
When any AP starting, the local neighbours are generated according to the neighbor AP for meeting preset standard that all channel scanning obtains
Table；
The neighbor table information for carrying the local neighbor table is sent to the control centre, so that the control centre is according to connecing
The neighbor table information received is updated the neighborhood in total neighbor table and sends out updated neighborhood
It send to AP involved in update.
3. wireless roaming method as described in claim 1, which is characterized in that the neighborhood is by the control centre
It is sent to corresponding AP after being updated according to the information received to preconfigured total neighbours, is specifically included：
Collect the client-entry that can receive signal；
The entry information for carrying the client-entry is sent to the control centre, so that the control centre is according to reception
To the entry information neighborhood in total neighbor table be updated and be sent to updated neighborhood
AP involved in updating；Wherein, the control centre obtains the neighborhood between AP to described total according to the entry information
Neighborhood in neighbor table is updated.
4. wireless roaming method as described in claim 1, which is characterized in that the method also includes：
The signal quality of monitoring and the associated all clients of this AP；
The signal quality of all clients is compared with preset threshold respectively；
Determine that signal quality needs to roam less than the client of the preset threshold.
5. wireless roaming method as described in claim 1, which is characterized in that described to determine roaming mesh according to the measurement result
AP, specifically include：
According to the signal quality of each AP recorded in the measurement result, cipher mode phase identical as the SSID of this AP is determined
Same and optimal signal quality AP is the roaming purpose AP.
6. wireless roaming method as described in claim 1, which is characterized in that it is described according to the roaming purpose AP to the visitor
Family end sends roaming and suggests, so that the client suggests carrying out respective handling according to the roaming, specifically includes：
It sends the roaming to the client according to the roaming purpose AP to suggest, so that the client is according to the roaming
It is recommended that carrying out roaming processing or refusal processing and returning to corresponding processing result.
7. wireless roaming method as claimed in claim 6, which is characterized in that the method also includes：
Judge whether the client roams success according to the processing result；Wherein, the processing result includes roaming successfully
As a result with roaming failure result；
When the processing result is the roaming successful result, determine that the client roams successfully, and stops to the visitor
The monitoring of the signal quality at family end；
When the processing result is the roaming failure result, the client roaming failure is determined, and according to the measurement
As a result determine that new roaming purpose AP to send new roaming suggestion to the client according to the new roaming purpose AP, makes
It obtains the client and respective handling is carried out according to the new roaming suggestion.
8. a kind of radio roaming system, which is characterized in that including control centre, at least two AP and at least one client；
Wherein,
Each AP is used to execute the wireless roaming method as described in any one of claims 1 to 7；
The control centre is used to be updated preconfigured total neighbours according to the information that receives, and by updated neighbour
The relationship of residence is sent to corresponding AP；
The channel measurement request that the client is used to be sent according to the AP received measures to obtain channel to be measured
The signal quality of AP on the channel to be measured simultaneously returns to corresponding measurement result；The client is also used to basis and receives
AP send roaming suggestion carry out respective handling.
9. radio roaming system as claimed in claim 8, which is characterized in that the control centre is also used to monitor each AP's
Working condition deletes the corresponding all information of variation AP in total neighbor table when the working condition of any AP changes
To be updated to the neighborhood in total neighbor table, and updated neighborhood is sent to corresponding AP.
10. radio roaming system as claimed in claim 8, which is characterized in that the function that the control centre is also used to AP is matched
It sets；Wherein, the functional configuration includes at least SSID configuration and cipher mode configuration.
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