CN106550348B - A kind of method that realizing roaming in the wireless local area network, wireless access point and server - Google Patents
A kind of method that realizing roaming in the wireless local area network, wireless access point and server Download PDFInfo
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- CN106550348B CN106550348B CN201611132293.4A CN201611132293A CN106550348B CN 106550348 B CN106550348 B CN 106550348B CN 201611132293 A CN201611132293 A CN 201611132293A CN 106550348 B CN106550348 B CN 106550348B
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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
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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
Abstract
The present invention provides a kind of method for realizing roaming in the wireless local area network, it include: that the first wireless access point AP obtains the candidate purpose AP set that candidate purpose wireless access point AP is roamed into from first wireless access point AP, first wireless access point AP obtains history corresponding with AP each in AP set and roams probability, first wireless access point AP, which is obtained, roams the corresponding weight of probability with each history, first wireless access point AP establishes the connection with wireless terminal, obtain the information of the wireless terminal, gathered according to the AP, the subclass for the AP that the weight and the history roaming determine the probability wireless terminal described in AP set may be roamed into, by the synchronizing information of the wireless terminal to the AP in the AP subclass, the embodiment of the present invention also provides one kind simultaneously AP and server, in this way, the scale of network and STA capacity not will receive the limitation of the memory capacity and process performance of AP.
Description
Technical field
The present invention relates to wireless communication technology fields, more particularly to a kind of side for realizing roaming in the wireless local area network
Method, wireless access point and server.
Background technique
First generation WLAN (WLAN) mainly uses fat AP framework, and every AP is independent access point, between AP not
In the presence of interaction and cooperate.It needs to be configured and managed for each in configuration, maintenance cost is high, safety is low；And
Due to lacking cooperation between AP, roaming etc. of the terminal user between AP cannot achieve.For such limitation and problem, based on wireless
The second generation WLAN framework -- centralized network architecture -- of controller comes into being.Centralized network architecture is by AC (wireless control
Device, Wireless Access Point Controller) realize centralized configuration and management, and support wireless resource management
(RRM, Radio Resource Management), terminal user are in AP internetwork roaming etc..But this framework bring it is above-mentioned good
While place, due to its centralized characteristic, performance bottleneck, Single Point of Faliure, higher cost and higher network has also been introduced
Extend complexity.For these problems, there are two kinds of thinkings solved the problems, such as.Thinking passes through collection first is that under original framework
The schemes such as group, local forwarding solve the problems, such as performance bottleneck, solve Single Point of Faliure etc. by the schemes such as hot standby.Second thinking is sought
New framework, wireless network architecture of new generation use the cloud wireless architecture of " cloud AC+AP ".This framework by the centralized configuration of AP,
Collaboration between management and AP receives cloud on planning as a whole, and the access of wireless user and data forwarding are transferred on AP, emphasize " cloud
Collaboration between the centralized management and AP of AC ".
Under cloud wireless architecture, 802.11 accesses of wireless user and data forwarding carry out all on AP.How to realize between AP
Seamless roam become new technical task.
The distribution position of virtual LAN VLAN and address pool that seamless roam between AP belongs to according to wireless terminal is divided into:
Two layers of roaming and three layers of roaming.
Two layers roaming refer to terminal (being indicated hereinafter with STA) be roamed into AP and be roamed out carries out data forwarding on AP when, category
In same two layers of domain (the same VLAN), in this case, STA is after roaming, the IP that obtains on being roamed out AP
Address is still effective on being roamed into AP, and data forwarding is unaffected.Three layers of roaming refer to that STA is being roamed into AP and is being roamed out
Belong to two layers of different domains on AP.In this case, STA is when roaming, from the IP address obtained on AP is roamed out, unrestrained
It is invalid for swimming on AP, and data forwarding is obstructed.STA reacquires IP address, and on the one hand original application layer conversation all fails
It needs to re-establish；On the other hand, it reacquires IP address needs to be triggered by STA, this process time-consuming is dependent on terminal STA to net
The sensitivity of network access detection, it is long to may cause the data outage time.
For above-mentioned three layers of roaming problem of travelling across VLAN, solved in the prior art using following two scheme:
1, AC internetwork roaming technical solution, AC internetwork roaming refer to STA from the AP that the AP of an AC roams into another AC.It is main
It to be roamed out AC by being sent to by the tunnel between AC by being roamed into AC for STA data traffic (message) and realizes；
2, local forwarding travelling across VLAN roaming technology scheme, it is local forward travelling across VLAN roaming refer to STA data message AP into
Row forwarding, STA roam into another AP from an AP, and being roamed out, AP VLAN corresponding with STA on AP is roamed into is different.It is main
It to be roamed out AP by being sent to by being roamed into AP for STA data message and realizes.
The common ground of above-mentioned two scheme is to be gone back to STA data to being roamed out AP by being roamed into AP.Repeatedly when roaming, need
STA data are gone back to initial AP, still, as the AP being roamed into, how to know and needs to go back to the data of STA to which
A AP?
It solves the above problems, existing technical solution includes the following two kinds:
1. preparatory Synchronos method
When STA is associated with, the data of STA are synchronized to all AP in same roaming group.
2. query method when roaming
STA is when being roamed into AP, by being roamed into reassociation requests frame (Re-association request) of the AP from STA
It is middle to obtain the BSSID (Old BSSID) for being roamed out AP (previous dive), and query-related information learns that the STA is overflow by being roamed out AP
Out.At this point, being roamed into AP to being roamed out what AP inquiry STA was initially diffused out by which AP, it is roamed out AP and informs the STA initially from AP
(a) it diffuses out, is roamed into AP later and goes back to the data of STA to AP (a).
1. preparatory Synchronos method there are the problem of
The AP number of one WLAN (WLAN) may reach several hundred thousands of, even greater rank.If AP is closed in STA
By the synchronizing information of STA to AP all in site when connection, then each STA association/roaming can trigger (N-1) secondary synchronizing information
(assuming that AP number is N).Two problems will be brought in this way: (1) each AP requires to store associated STA letter on whole all AP of net
Breath, the scale and STA capacity of network will be limited by the memory capacity and process performance of AP；(2) STA information synchronous between AP per second
Number will increase with AP number and the increase for being concurrently associated with/roaming number of STA, by the place of the bandwidth between a large amount of consumption AP and AP
Rationality energy.
2. roaming when query method there are the problem of
There are probelem in two aspects for inquiry when roaming.(1) in the reassociation requests frame processing of STA, need by an AP
Between just can be carried out response after communication interaction, this will increase the answer delay of STA reassociation requests frame；Also, it communicates and hands between AP
The mutually process performance dependent on go-between delay and opposite end AP, may cause reassociation requests frame response time-out, and STA roaming is lost
It loses.(2) the processing roamed is dependent on the Old BSSID carried in the reassociation requests frame of STA.And there are one for actual test discovery
A little terminals are in roaming, the case where not sending out reassociation requests frame, and directly transmit association request.In this case, this scheme
It cannot achieve roaming function.
Summary of the invention
In order to solve the above technical problems, the embodiment of the present invention provides a kind of side for realizing roaming in the wireless local area network
Method, applied in the Wireless LAN comprising cloud server, comprising the following steps:
First wireless access point AP obtains from first wireless access point AP and is roamed into candidate purpose wireless access point AP
Candidate purpose AP set,
First wireless access point AP obtains history corresponding with AP each in AP set and roams probability,
First wireless access point AP, which is obtained, roams the corresponding weight of probability with each history,
First wireless access point AP establishes the connection with wireless terminal, the information of the wireless terminal is obtained, according to described
AP set, the weight and the history roaming determine the probability wireless terminal described in AP set may be roamed into
The subclass of AP gives the synchronizing information of the wireless terminal to the AP in the AP subclass,
In order to which the server is determining its received letter for sending the wireless terminal roaming and entering wireless access point AP
When second wireless access point AP of breath is not in the AP subclass that the server itself saves, determine that described first is wireless
Access point AP determines the decision failure of the subclass for the AP that the wireless terminal described in AP set may be roamed into, and to institute
It states weight and carries out re -training.
Meanwhile the embodiment of the present invention provides another method for realizing roaming in the wireless local area network, be applied to comprising
In the Wireless LAN of cloud server, comprising the following steps:
The server sends from the first AP to the first wireless access point AP and is roamed into candidate purpose wireless access point
The candidate purpose AP of AP gathers,
The server sends the first AP history roaming corresponding with AP each in AP set generally to the first AP
Rate,
The server sends to the first AP and roams the corresponding weight of probability with each history,
In order to which the first AP establishes the connection with wireless terminal, the information of the wireless terminal is obtained, according to described
AP set, the weight and the history roaming determine the probability wireless terminal described in AP set may be roamed into
The subclass of AP gives the synchronizing information of the wireless terminal to the AP in the AP subclass,
The server is determining its received for sending described wireless terminal roaming and entering the information of wireless access point AP
When two wireless access point APs are not in the AP subclass that the server itself saves, determine that the first AP is determined in institute
The decision failure of the subclass for the AP that wireless terminal described in AP set may be roamed into is stated, and the weight is instructed again
Practice.
Meanwhile the embodiment of the present invention provides a kind of wireless access point AP for realizing roaming in a wireless local area network, is applied to
In Wireless LAN comprising cloud server, comprising:
First obtains module, is roamed into candidate purpose wireless access point AP for obtaining from first wireless access point AP
Candidate purpose AP set,
Second obtains module, roams probability for obtaining history corresponding with AP each in AP set,
Third obtains module, roams the corresponding weight of probability with each history for obtaining,
Connection establishment module, for establish with the connection of wireless terminal, obtain the information of the wireless terminal,
Decision-making module, for roaming determine the probability in the AP according to AP set, the weight and the history
The subclass for the AP that wireless terminal described in set may be roamed into, in order to which the server is determining its received transmission institute
State wireless terminal roaming enter wireless access point AP information the second wireless access point AP not the server itself save
When in the AP subclass, determine that first wireless access point AP determines that the wireless terminal described in AP set may be overflow
Swim into AP subclass decision failure, and to the weight carry out re -training,
Synchronization module, the AP for giving the synchronizing information of the wireless terminal in the AP subclass.
Meanwhile the embodiment of the present invention provides a kind of server for realizing roaming in a wireless local area network, comprising:
Preserving module, for saving the candidate purpose AP set for being roamed into candidate purpose wireless access point AP from the first AP,
First AP history corresponding with AP each in AP set roams probability, and roams probability pair with each history
The weight answered,
First sending module, it is wireless for being roamed into candidate purpose to the transmission of the first wireless access point AP from the first AP
The candidate purpose AP of access point AP gathers,
Second sending module, for sending the first AP history corresponding with AP each in AP set to the first AP
Probability is roamed,
Third sending module roams the corresponding weight of probability with each history for sending to the first AP, in order to
First AP establishes the connection with wireless terminal, obtains the information of the wireless terminal, according to AP set, the weight
And the history roams the subclass for the AP that determine the probability wireless terminal described in AP set may be roamed into, by institute
The synchronizing information of wireless terminal is stated to the AP in the AP subclass,
Processing module, for determining its received information for sending described wireless terminal roaming and entering wireless access point AP
When second wireless access point AP is not in the AP subclass that the server itself saves, determine that the first AP is determined
The decision failure of the subclass for the AP that wireless terminal described in the AP set may be roamed into, and the weight is carried out again
Training.
The beneficial effect of the embodiment of the present invention is, applied in the Wireless LAN comprising cloud server, including
Following steps: the first wireless access point AP obtains from first wireless access point AP and is roamed into candidate purpose wireless access point AP
Candidate purpose AP set, the first wireless access point AP obtains history roaming probability corresponding with each AP in AP set,
First wireless access point AP obtains weight corresponding with each history roaming probability, the foundation of the first wireless access point AP and nothing
The connection of line terminal obtains the information of the wireless terminal, is roamed according to AP set, the weight and the history general
Rate determines the subclass for the AP that the wireless terminal described in AP set may be roamed into, and the information of the wireless terminal is same
It walks to the AP in the AP subclass, in order to which the server is determining that its received send described wireless terminal roaming and enter nothing
When second wireless access point AP of the information of line access point AP is not in the AP subclass that the server itself saves, really
Fixed first wireless access point AP determines the subclass for the AP that the wireless terminal described in AP set may be roamed into
Decision failure, and re -training is carried out to the weight.As it can be seen that in the embodiment of the present invention, when AP synchronizes roaming information in advance, only
It needs to synchronize toward on a small amount of AP, and will not increase as network size increases, the bandwidth consumption between AP is small, and each AP is not required to
Associated STA information on whole all AP of net is stored, the scale and STA capacity of network not will receive the memory capacity and processing of AP
The limitation of performance.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of the prior art
Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the invention
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of method flow diagram provided in an embodiment of the present invention；
Fig. 2 is a kind of method flow diagram provided in an embodiment of the present invention；
Fig. 3 is a kind of method flow diagram provided in an embodiment of the present invention；
Fig. 4 is a kind of application scenarios system structure diagram provided in an embodiment of the present invention；
Fig. 5 is a kind of structure drawing of device provided in an embodiment of the present invention；
Fig. 6 is a kind of structure drawing of device provided in an embodiment of the present invention；
Fig. 7 is a kind of structure drawing of device provided in an embodiment of the present invention；
Fig. 8 is a kind of structure drawing of device provided in an embodiment of the present 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, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
One embodiment of the invention provides a kind of method for realizing roaming in the wireless local area network, is applied to take comprising cloud
It is engaged in the Wireless LAN of device, as shown in Figure 1, comprising the following steps:
S101, the first wireless access point AP obtain from first wireless access point AP and are roamed into candidate purpose wireless access
The candidate purpose AP of point AP gathers,
S103, the first wireless access point AP obtain history corresponding with AP each in AP set and roam probability,
S105, the first wireless access point AP, which is obtained, roams the corresponding weight of probability with each history,
S107, the first wireless access point AP establish the connection with wireless terminal, obtain the information of the wireless terminal, according to
The AP set, the weight and the history roaming determine the probability wireless terminal described in AP set may roam
The subclass of the AP entered, by the synchronizing information of the wireless terminal to the AP in the AP subclass；
In order to which the server is determining its received letter for sending the wireless terminal roaming and entering wireless access point AP
When second wireless access point AP of breath is not in the AP subclass that the server itself saves, determine that described first is wireless
Access point AP determines the decision failure of the subclass for the AP that the wireless terminal described in AP set may be roamed into, and to institute
It states weight and carries out re -training.
It optionally, is in order to which STA occurs later by the synchronizing information of the wireless terminal to the AP in the AP subclass
When roaming, the relevant information of STA can be got in advance by diffusing in AP；
Optionally, described that determine the probability is roamed according to AP set, the weight and the history in step S107
The step of subclass for the AP that the wireless terminal described in AP set may be roamed into, as shown in Fig. 2, specifically including:
S1071 determines the history roaming for being roamed into each AP in the AP set from the first AP in first time period
First product of probability weight corresponding with history roaming probability；
S1073 determines the history roaming for being roamed into each AP in the AP set from the first AP in second time period
Second product of probability weight corresponding with history roaming probability；
S1075, for each AP in AP set, when the sum of first product and second product is more than or equal to
When the first threshold of setting, the AP in AP set is added to the subclass for the AP that the wireless terminal may be roamed into
In.
Optionally, before step S101 further include:
The wireless signal of other AP of first wireless access point AP scanning surrounding and the power for uploading the wireless signal
To the server, in order to which the server is when the power of the wireless signal is greater than preset threshold, by the wireless communication
Number corresponding AP is added into the set of the candidate purpose wireless access point AP；Alternatively,
The signal strength of the first wireless terminal of the first wireless access point AP detection simultaneously uploads to the signal strength
The server, in order to which the server is in the third for determining that the signal strength is greater than the second threshold of setting and receives
AP detection to and the signal strength of first wireless terminal that uploads also greater than the second threshold when, the 3rd AP is added
It is added in the set of the candidate purpose AP.
Another embodiment of the present invention provides the method that one kind realizes roaming in the wireless local area network, it is applied to include cloud
In the Wireless LAN of server, as shown in Figure 3, comprising the following steps:
S201, the server are roamed into candidate purpose from the first AP to the transmission of the first wireless access point AP and wirelessly connect
The candidate purpose AP of access point AP gathers,
S203, the server send the first AP history corresponding with AP each in AP set to the first AP and overflow
Probability is swum,
S205, the server send to the first AP and roam the corresponding weight of probability with each history,
In order to which the first AP establishes the connection with wireless terminal, the information of the wireless terminal is obtained, according to described
AP set, the weight and the history roaming determine the probability wireless terminal described in AP set may be roamed into
The subclass of AP gives the synchronizing information of the wireless terminal to the AP in the AP subclass,
S207, the server are determining its received information for sending the wireless terminal roaming and entering wireless access point AP
The second wireless access point AP not in the AP subclass that the server itself saves when, determine that the first AP is determined
The decision failure of the subclass for the AP that the wireless terminal described in AP set may be roamed into, and weight is carried out to the weight
New training.
It optionally, is in order to which STA occurs later by the synchronizing information of the wireless terminal to the AP in the AP subclass
When roaming, the relevant information of STA can be got in advance by diffusing in AP；
Optionally, before step S201 further include:
The server receive the first AP that the first AP is sent scan around other AP wireless signal
Power, the wireless signal power be greater than preset threshold when, the corresponding AP of the wireless signal is added into the time
In the set for selecting purpose wireless access point AP；Alternatively,
The server receive first AP detection that the first AP is sent to the first wireless terminal signal it is strong
Degree, determine the signal strength be greater than setting second threshold and received third AP detection arrive and upload described first
When the signal strength of wireless terminal is also greater than the second threshold, the 3rd AP is added into the set of the candidate purpose AP
In.
Optionally, the method also includes steps:
The server is determining its received for sending described wireless terminal roaming and entering the information of wireless access point AP
When two wireless access point APs are not in the AP subclass that the server itself saves, the 2nd AP is added into described
In the set of candidate purpose AP.
Below with reference to concrete application scene, above-described embodiment is specifically described:
Fig. 4 is a kind of application scenarios system structure diagram provided in an embodiment of the present invention.
Topology explanation, as shown in Figure 4:
(1) AP1, AP2, AP3, AP4 are 4 AP in same WLAN；For simplified model, it is assumed that four AP use phase
Same SSID.For AP1, AP2, the associated user of this SSID belongs to local subnet 1, using VLAN ID: VLAN10.It is right
In AP3, AP4, the associated user of this SSID belongs to local subnet 2, using VLAN ID: VLAN 20.
(2) local subnet 1, VLAN 10, IP address pond use 10.10.10.0/24 network segment；Local subnet 2, VLAN20；
IP address pond uses 10.10.20.0/24 network segment；
(3) AP1, AP2, AP3 and AP4 belong to management VLAN 1, and IP address pond uses 192.168.1.0/24 network segment.
Based on above topology structure, the operational process of the application scenarios is as follows:
Step 1: original state is STA online in AP1 association, passes through (Dynamic Host Configuration
Protocol, dynamic host configuration protocol) Dynamic Host Configuration Protocol server obtain VLAN 10 IP address 10.10.10.2, STA default net
Closing is 10.10.10.1, on the first line of a couplet three-layer equipment of AP1.The data traffic of STA is locally forwarded by AP1.
Step 2: roaming (1 is roamed in Fig. 4) for the first time, STA roams into AP2 from AP1；
This roaming belongs to two layers of roaming, and the IP address of STA is constant, and data flow is locally forwarded from AP2.
Step 3: second of roaming (2 are roamed in Fig. 4), STA roams into AP3 from AP2；
This roaming belongs to three layers of roaming, and the data traffic of STA is gone back to by the tunnel between AP3 and AP2 to AP2 from AP3,
It is forwarded outward by AP2 again.
AP2 is agency of the STA in initial subnet (" local "), when STA roams in other subnets, all data of STA
Flow all by by it is associated diffuse in AP and go back to give home agent AP (referred to as HA-AP, Home Agent AP).
Step 4: third time roaming (3 are roamed in Fig. 4), STA roams into AP4 from AP3；
This roaming belongs to three layers of roaming, and the data traffic of STA is gone back to by the tunnel between AP4 and AP2 to AP2 from AP4,
It is forwarded outward by AP2 again.
It in above-mentioned process, in order to allow AP2, AP3, AP4 when STA is diffused in, quickly handles it, needs when following several
Quarter is done as follows, as shown in table 1:
| Moment | Operation |
| When STA associated AP 1 | AP1 is by the synchronizing information of STA to AP2 |
| When STA diffuses in AP2 | AP2 is by the synchronizing information of STA to AP3 |
| When STA diffuses in AP3 | AP3 is by the synchronizing information of STA to AP4 |
Table 1
At the above three moment, AP1, AP2 and AP3 respectively as decision-maker, need decision by the synchronizing information of STA to
Which AP then needs to carry out decision by the following method:
When STA is associated with/diffuses in some AP1, this AP1 decision is needed the STA synchronizing information toward certain AP, then these
What AP1 needed for the past several AP of the STA synchronizing information to be known as AP1 is roamed into candidate purpose AP (can be described as roaming neighbours).It is unrestrained
Trip neighbours are the set of AP, and the roaming neighbours of each AP may be different AP set.
Decision process is described as follows:
(1) cloud server (such as Fig. 4 medium cloud AC) will safeguard that the candidate purpose AP that is roamed into of each AP gathers, and synchronous
To each AP；
(2) when STA1 is associated with or when diffusing in one of AP1, AP1 with oneself be roamed into candidate purpose AP set, with
The corresponding history roaming probability of each AP in AP set roams the AP itself such as the corresponding weight of probability with each history
Input of the information that can be got as decision model, is calculated according to decision model, is obtained the result of decision and (is roamed into candidate
The subclass of purpose AP set): { AP2:1, AP3:0 ... ..., APn:0 }.Wherein " AP2:1 " indicates that AP2 needs to synchronize, " AP3:
0 " expression AP3 does not need to synchronize.
(3) when STA1 actually occurs roaming, if actually roaming into APk, and APkCandidate purpose is roamed into aforementioned AP1
In AP set, then this time roaming constitutes a training sample, and input SVM (support vector machines) is trained, and is corrected by training
Above-mentioned decision model.Wherein, machine learning uses SVM algorithm in the embodiment, but be not restricted to that this machine learning algorithm, is adopted
Scheme essence is had no effect on other machines learning algorithm, still falls within protection scope of the present invention.
If actually roaming into APk, and APkIt is not roamed into candidate purpose AP set in aforementioned AP1, then by APkIt is added
AP1's is roamed into candidate purpose AP set.
In above-mentioned steps (1), it is assumed that for AP1, cloud server (such as cloud access controller AC) calculates AP1 and is roamed into
The information source of candidate purpose AP set includes:
1. the periphery radio frequency reading information of AP1
2. probe and associated data that AP1 is reported
3. roam-requests (reassociation requests) situation of STA
4. history roaming condition
Cloud server (such as cloud access controller AC) calculate AP1 be roamed into candidate purpose AP set detailed process can be with
Are as follows:
The wireless signal of other AP and the power of the wireless signal is uploaded to the server around AP1 scanning, so as to
In the server when the power of the wireless signal is greater than preset threshold, the corresponding AP of the wireless signal is added into institute
In the set for stating candidate purpose wireless access point AP；
Specifically, the periphery radio frequency reading information reported according to AP1, if for another AP2, if AP1 scanning is arrived
The wireless messages of AP2 release, and power is greater than specified threshold 1 (such as -70dB), then AP2 is added to the candidate purpose AP of AP1
In set；
Alternatively,
The signal strength is simultaneously uploaded to the cloud server by the signal strength of the AP1 detection wireless terminal STA,
In order to which the server is determining that the signal strength is greater than the second threshold of setting and the third AP detection that receives to simultaneously
When the signal strength of first wireless terminal uploaded is also greater than the second threshold, the 3rd AP is added into the time
In the set for selecting purpose AP.
Specifically, (not associated, but AP energy according to AP1 the association wireless terminal STA reported and probe wireless terminal STA
The wireless terminal STA detected) signal strength (RSSI), if for another AP3, for the same wireless terminal STA,
Within the same period, the RSSI for the STA detected that the RSSI and AP3 for the STA detected that AP1 is reported are reported is big
In specified threshold 2, then AP3 is added in the set of the candidate purpose AP of AP1；
Optionally, in the practical roaming of STA, AP is roamed into from AP1i, if it find that APiNot in the candidate purpose AP collection of AP1
In conjunction, then it is added；
Optionally, for AP1, some AP4 is in the candidate purpose AP set of AP1, if in nearest (time a period of time
Threshold value 3, such as 10 days) in, AP4 is roamed into from AP1 without there is any STA, then by AP4 from the candidate purpose AP collection of AP1
It is removed in conjunction.
In above-mentioned steps (2), decision model can be established by the following method:
Relation factor, such as roaming probability are determined first；When STA1 is associated with/diffuse in AP1 when, for each candidate purpose
APj, historical data (AP1 to APjRoaming probability) be able to reflect STA1 after this secondary association/diffuse in, roam into AP from AP1j
Probability.Section different probability may be presented in different times in this probability, comprising: 1. 24 hours one day, each hour could
It can be different；2. 7 days one week, daily situation may be different；3. 31 days one month, daily situation may be different.
Above-mentioned relation factor can be defined by following symbol:
P(1,j)=AP1To APjHistory roam probability=(AP1Roam into APjTotal degree)/(APjDiffuse out any AP
Total degree)；
To APjH hours history roams probability (wherein h value [0,23])
To APj(wherein dw value [0,6], dw are day of to the dw days history roaming probability
Week abbreviation)
To APj(wherein dm value [0,30], dm are day of to the dm days history roaming probability
Month abbreviation)
For AP1, at any time, above-mentioned four classes probability is determining value, and cloud server is regularly updated to AP1.Note
It anticipates a bit,There are 24 values,There are 7 values,There are 31 values.
Secondly, determining classifier；When STA1 is associated with/diffuse in AP1 when, AP1 needs the decision done to be: candidate purpose AP set
In AP which need to synchronize, which is asynchronous.It is that (one kind needs same two classes that AP in the candidate purpose AP set of AP1, which is divided to,
Step is labeled as 1；It is another kind of not need to synchronize, labeled as 0).
Again, decision model is determined；Decision model illustrates in two steps: 1. calculating AP1 to APjRoaming probability f(1,j)；
2. according to f(1,j)Comparison threshold value judges whether to synchronize.
Step 1:
Wherein:
w1Indicate P(1,j)For the weight of AP1；
It indicatesFor the weight of AP1；
It indicatesFor the weight of AP1；
It indicatesFor the weight of AP1；
This four weights are obtained by cloud server according to training sample training, and are regularly updated to AP1.
Step 2:
Finally, evaluation of result and training sample；
STA is associated with/when diffusing in AP1, AP1 is obtained according to above-mentioned decision model such as making policy decision:
g(1, and 2,3,4 ..., n })=1,0,1 ..., 1 }, later if STA is roamed, roam into APk, and APkIn the roaming of AP1
In neighbours candidate AP set, i.e., practical g '(1,k)=1.
Evaluation of result:
If g in the result of decision(1,k)=1, then decision is correct；, whereas if g(1,k)=0, then decision fails.
Training sample:
It is evaluated by the above results it is found that STA is diffused out from AP1 each time, as long as diffusing in AP in purpose candidate's AP collection of AP
In conjunction, a training sample can be formed.
By the continuous training study of training sample, w can be allowed1、Closer to actual conditions, from
And decision success rate is continuously improved.
Another embodiment of the present invention provides the wireless access point APs that one kind realizes roaming in a wireless local area network, are applied to packet
In Wireless LAN containing cloud server, as shown in Figure 5, comprising:
First obtains module 301, is roamed into candidate purpose wireless access for obtaining from first wireless access point AP
The candidate purpose AP of point AP gathers,
Second obtains module 303, roams probability for obtaining history corresponding with AP each in AP set,
Third obtains module 305, roams the corresponding weight of probability with each history for obtaining,
Connection establishment module 307, for establish with the connection of wireless terminal, obtain the information of the wireless terminal,
Decision-making module 309, for roaming determine the probability described according to AP set, the weight and the history
The subclass for the AP that wireless terminal described in AP set may be roamed into, in order to which the server is determining its received transmission
The second wireless access point AP that the wireless terminal roaming enters the information of wireless access point AP is not saved in the server itself
The AP subclass in when, determine that first wireless access point AP determines that the wireless terminal described in AP set may
The decision of the subclass for the AP being roamed into fails, and carries out re -training to the weight,
Synchronization module 311, the AP for giving the synchronizing information of the wireless terminal in the AP subclass.
It optionally, is in order to which STA occurs later by the synchronizing information of the wireless terminal to the AP in the AP subclass
When roaming, the relevant information of STA can be got in advance by diffusing in AP；
Optionally, decision-making module 309 is specifically used for,
Determine first time period from the first AP be roamed into the history roaming probability of each AP in AP set with
The history roams the first product of the corresponding weight of probability；
Determine second time period from the first AP be roamed into the history roaming probability of each AP in AP set with
The history roams the second product of the corresponding weight of probability；
For each AP in AP set, when the sum of first product and second product is more than or equal to setting
When first threshold, the AP in AP set is added in the subclass for the AP that the wireless terminal may be roamed into, so as to
In the server determine its it is received send described wireless terminal roaming enter wireless access point AP information it is second wireless
When access point AP is not in the AP subclass that the server itself saves, determine that first wireless access point AP determines
The decision failure of the subclass for the AP that the wireless terminal described in AP set may be roamed into, and weight is carried out to the weight
New training.
Optionally, the AP further include:
Information collection module, for other AP around scanning wireless signal and upload the power of the wireless signal to institute
Server is stated, in order to which the server is when the power of the wireless signal is greater than preset threshold, by the wireless signal pair
The AP answered is added into the set of the candidate purpose wireless access point AP；Or be used for,
It detects the signal strength of the first wireless terminal and the signal strength is uploaded into the server, in order to described
Server determine the signal strength be greater than the second threshold of setting and the third AP detection that receives to and described in uploading
When the signal strength of first wireless terminal is also greater than the second threshold, the 3rd AP is added into the candidate purpose AP's
In set.
Another embodiment of the present invention provides the servers that one kind realizes roaming in a wireless local area network, as shown in fig. 6, packet
It includes:
First sending module 401 is roamed into candidate purpose for sending to the first wireless access point AP from the first AP
The candidate purpose AP of wireless access point AP gathers,
Second sending module 403, it is corresponding with each AP in AP set for sending the first AP to the first AP
History roams probability,
Third sending module 405 roams the corresponding weight of probability with each history for sending to the first AP, so as to
The connection with wireless terminal is established in the first AP, obtains the information of the wireless terminal, according to AP set, the power
The subclass for the AP that weight and the history roaming determine the probability wireless terminal described in AP set may be roamed into, will
The synchronizing information of the wireless terminal gives the AP in the AP subclass,
Preserving module 407, for saving the candidate purpose AP collection for being roamed into candidate purpose wireless access point AP from the first AP
It closes, the first AP history corresponding with AP each in AP set roams probability, and general with each history roaming
The corresponding weight of rate；
Processing module 409, for determining its received letter for sending the wireless terminal roaming and entering wireless access point AP
When second wireless access point AP of breath is not in the AP subclass that the server itself saves, determine that the first AP is true
It is scheduled on the decision failure of the subclass for the AP that wireless terminal described in the AP set may be roamed into, and the weight is carried out
Re -training.
It optionally, is in order to which STA occurs later by the synchronizing information of the wireless terminal to the AP in the AP subclass
When roaming, the relevant information of STA can be got in advance by diffusing in AP；
Optionally, as shown in fig. 7, the server further include:
First set establishes module 411, for receive the first AP that the first AP is sent scan around its
The power of the wireless signal of his AP, it is when the power of the wireless signal is greater than preset threshold, the wireless signal is corresponding
AP is added into the set of the candidate purpose wireless access point AP；Or be used for,
Receive first AP detection that the first AP is sent to the first wireless terminal signal strength, determining
It states that signal strength is arrived greater than the second threshold and received third AP detection set and first wireless terminal of upload
When signal strength is also greater than the second threshold, the 3rd AP is added into the set of the candidate purpose AP.
Optionally, as shown in figure 8, the server further includes,
Second set establishes module 412, for determining that its received send described wireless terminal roaming and enter wireless access
When second wireless access point AP of the information of point AP is not in the AP subclass that the server itself saves, by described the
Two AP are added into the set of the candidate purpose AP.
As seen through the above description of the embodiments, those skilled in the art can be understood that the present invention can
It realizes by means of software and necessary general hardware platform.Based on this understanding, technical solution of the present invention essence
On in other words the part that contributes to existing technology can be embodied in the form of software products, the computer software product
It can store in storage medium, such as ROM/RAM, magnetic disk, CD, including some instructions are used so that a computer equipment
(can be personal computer, server or the network equipment etc.) executes the certain of each embodiment or embodiment of the invention
Method described in part.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for device or
For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method
The part of embodiment illustrates.Apparatus and system embodiment described above is only schematical, wherein the conduct
The unit of separate part description may or may not be physically separated, component shown as a unit can be or
Person may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can root
According to actual need that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.Ordinary skill
Personnel can understand and implement without creative efforts.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (12)
1. the method that one kind realizes roaming in the wireless local area network, which is characterized in that applied to the nothing comprising cloud server
In line local area network, comprising the following steps:
First wireless access point AP obtains the time that candidate purpose wireless access point AP is roamed into from first wireless access point AP
Purpose AP is selected to gather,
First wireless access point AP obtains history corresponding with AP each in AP set and roams probability,
First wireless access point AP, which is obtained, roams the corresponding weight of probability with each history,
First wireless access point AP establishes the connection with wireless terminal, the information of the wireless terminal is obtained, according to the AP collection
The AP's that conjunction, the weight and the history roaming determine the probability wireless terminal described in AP set may be roamed into
Subclass gives the synchronizing information of the wireless terminal to the AP in the AP subclass,
In order to which the server is determining its received information for sending described wireless terminal roaming and entering wireless access point AP
When second wireless access point AP is not in the AP subclass that the server itself saves, first wireless access is determined
Point AP determines the decision failure of the subclass for the AP that the wireless terminal described in AP set may be roamed into, and to the power
Re -training is carried out again.
2. the method as described in claim 1, which is characterized in that described according to AP set, the weight and described to go through
The step of subclass for the AP that history roaming determine the probability wireless terminal described in AP set may be roamed into, specifically includes:
Determine the history roaming for being roamed into each AP in the AP set from first wireless access point AP in first time period
First product of probability weight corresponding with history roaming probability；
Determine the history roaming for being roamed into each AP in the AP set from first wireless access point AP in second time period
Second product of probability weight corresponding with history roaming probability；
For each AP in AP set, when first of sum more than or equal to setting of first product and second product
When threshold value, the AP in AP set is added in the subclass for the AP that the wireless terminal may be roamed into.
3. the method as described in claim 1, which is characterized in that first wireless access point AP obtains wireless from described first
Access point AP was roamed into before the step of set of candidate purpose wireless access point AP further include:
Around first wireless access point AP scanning wireless signal of other AP and the power of the wireless signal is uploaded to institute
Server is stated, in order to which the server is when the power of the wireless signal is greater than preset threshold, by the wireless signal pair
The AP answered is added into the set of the candidate purpose wireless access point AP；Alternatively,
The signal strength of the first wireless terminal of the first wireless access point AP detection simultaneously uploads to the signal strength described
Server, in order to which the server is determining that the signal strength is greater than the second threshold of setting and the third received is wireless
Access point AP detection to and the signal strength of first wireless terminal that uploads also greater than the second threshold when, by described
Three wireless access point APs are added into the set of the candidate purpose AP.
4. the method that one kind realizes roaming in the wireless local area network, which is characterized in that applied to the nothing comprising cloud server
In line local area network, comprising the following steps:
The server sends that from first wireless access point AP to be roamed into candidate purpose wireless to the first wireless access point AP
The candidate purpose AP of access point AP gathers,
The server sends each AP in first wireless access point AP and AP set to the first wireless access point AP
Corresponding history roams probability,
The server sends to the first wireless access point AP and roams the corresponding weight of probability with each history,
In order to which first wireless access point AP establishes the connection with wireless terminal, the information of the wireless terminal, root are obtained
It may be overflow according to AP set, the weight and the history roaming determine the probability wireless terminal described in AP set
Swim into AP subclass, by the synchronizing information of the wireless terminal to the AP in the AP subclass,
The server is determining its received the second nothing for sending the wireless terminal roaming and entering the information of wireless access point AP
When line access point AP is not in the AP subclass that the server itself saves, determine that first wireless access point AP is true
It is scheduled on the decision failure of the subclass for the AP that wireless terminal described in the AP set may be roamed into, and the weight is carried out
Re -training.
5. method as claimed in claim 4, which is characterized in that the server is sent to the first wireless access point AP from described
First wireless access point AP was roamed into before the step of candidate purpose AP set of candidate purpose wireless access point AP further include:
Around first wireless access point AP that first wireless access point AP is sent that the server receives scans
The power of the wireless signal of other AP, it is when the power of the wireless signal is greater than preset threshold, the wireless signal is corresponding
AP be added into the set of the candidate purpose wireless access point AP；Alternatively,
The server receives first that first wireless access point AP that first wireless access point AP is sent detects
The signal strength of wireless terminal is determining second threshold of the signal strength greater than setting and received third wireless access point
When the signal strength of first wireless terminal that AP detection is arrived and upload is also greater than the second threshold, by the third without
Line access point AP is added into the set of the candidate purpose AP.
6. method as claimed in claim 4, which is characterized in that the method also includes the server is determining its reception
The transmission wireless terminal roaming enter wireless access point AP information the second wireless access point AP not the server from
When in the AP subclass that body saves, second wireless access point AP is added into the set of the candidate purpose AP.
7. the wireless access point AP that one kind realizes roaming in a wireless local area network, which is characterized in that be applied to include cloud service
In the Wireless LAN of device, comprising:
First obtains module, for obtaining the candidate mesh for being roamed into candidate purpose wireless access point AP from the first wireless access point AP
AP set,
Second obtains module, roams probability for obtaining history corresponding with AP each in AP set,
Third obtains module, roams the corresponding weight of probability with each history for obtaining,
Connection establishment module, for establish with the connection of wireless terminal, obtain the information of the wireless terminal,
Decision-making module, for being gathered according to AP set, the weight and history roaming determine the probability in the AP
Described in the subclass of AP that may be roamed into of wireless terminal, in order to which the server is determining that its received sends the nothing
Described in the second wireless access point AP that line terminal roaming enters the information of wireless access point AP is not saved in the server itself
When in AP subclass, determine that first wireless access point AP determines that the wireless terminal described in AP set may be roamed into
AP subclass decision failure, and to the weight carry out re -training,
Synchronization module, the AP for giving the synchronizing information of the wireless terminal in the AP subclass.
8. AP as claimed in claim 7, which is characterized in that the decision-making module is specifically used for,
Determine the history roaming for being roamed into each AP in the AP set from first wireless access point AP in first time period
First product of probability weight corresponding with history roaming probability；
Determine the history roaming for being roamed into each AP in the AP set from first wireless access point AP in second time period
Second product of probability weight corresponding with history roaming probability；
For each AP in AP set, when first of sum more than or equal to setting of first product and second product
When threshold value, the AP in AP set is added in the subclass for the AP that the wireless terminal may be roamed into, in order to institute
It states server and is determining its received the second wireless access for sending the wireless terminal roaming and entering the information of wireless access point AP
When point AP is not in the AP subclass that the server itself saves, determine that first wireless access point AP is determined in institute
The decision failure of the subclass for the AP that wireless terminal described in AP set may be roamed into is stated, and the weight is instructed again
Practice.
9. AP as claimed in claim 7, which is characterized in that further include:
Information collection module, for other AP around scanning wireless signal and upload the power of the wireless signal to the clothes
Business device, it is in order to which the server is when the power of the wireless signal is greater than preset threshold, the wireless signal is corresponding
AP is added into the set of the candidate purpose wireless access point AP；Or be used for,
It detects the signal strength of the first wireless terminal and the signal strength is uploaded into the server, in order to the service
Device is determining that the signal strength is greater than the second threshold of setting and the third wireless access point AP that receives is detected and uploaded
First wireless terminal signal strength also greater than the second threshold when, the third wireless access point AP is added into
In the set of candidate's purpose AP.
10. the server that one kind realizes roaming in a wireless local area network characterized by comprising
Preserving module, for saving the candidate purpose AP for being roamed into candidate purpose wireless access point AP from the first wireless access point AP
Set, the corresponding history of each AP roams probability in first wireless access point AP and the AP set, and with it is described often
A history roams the corresponding weight of probability；
First sending module is roamed into candidate mesh for sending to the first wireless access point AP from first wireless access point AP
Wireless access point AP candidate purpose AP set,
Second sending module, for being sent in first wireless access point AP and AP set to the first wireless access point AP
The corresponding history of each AP roams probability,
Third sending module roams the corresponding weight of probability with each history for sending to the first wireless access point AP,
In order to which first wireless access point AP establishes the connection with wireless terminal, the information of the wireless terminal is obtained, according to institute
State AP set, the weight and the history roaming determine the probability wireless terminal described in AP set may be roamed into
AP subclass, by the synchronizing information of the wireless terminal to the AP in the AP subclass,
Processing module, for determining its received second for sending the wireless terminal roaming and entering the information of wireless access point AP
When wireless access point AP is not in the AP subclass that the server itself saves, first wireless access point AP is determined
Determine the decision failure for the subclass of AP that the wireless terminal described in AP set may be roamed into, and to the weight into
Row re -training.
11. server as claimed in claim 10, which is characterized in that further include:
First set establishes module, sweeps for receiving first wireless access point AP that first wireless access point AP is sent
The power of the wireless signal of other AP around retouching, when the power of the wireless signal is greater than preset threshold, by the nothing
The corresponding AP of line signal is added into the set of the candidate purpose wireless access point AP；Or be used for,
Receive the first wireless terminal that first wireless access point AP that first wireless access point AP is sent detects
Signal strength is determining what the signal strength was detected greater than the second threshold and received third wireless access point AP set
And upload first wireless terminal signal strength also greater than the second threshold when, by the third wireless access point AP
It is added into the set of the candidate purpose AP.
12. server as claimed in claim 10, which is characterized in that further include,
Second set establishes module, for determining its received letter for sending the wireless terminal roaming and entering wireless access point AP
When second wireless access point AP of breath is not in the AP subclass that the server itself saves, described second is wirelessly connect
Access point AP is added into the set of the candidate purpose AP.
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| CN110475248A (en) * | 2018-05-10 | 2019-11-19 | 中国移动通信集团浙江有限公司 | A kind of wireless network architecture and wireless network access method |
| CN110519816B (en) * | 2019-08-22 | 2021-09-10 | 普联技术有限公司 | Wireless roaming control method, device, storage medium and terminal equipment |
| CN110933723B (en) * | 2019-11-21 | 2022-01-04 | 普联技术有限公司 | Roaming switching control method and device and wireless AP |
| CN111447660B (en) * | 2020-06-17 | 2020-09-22 | 深圳市乙辰科技股份有限公司 | Network roaming control method and device of terminal equipment and cloud control equipment |
| CN117083978A (en) * | 2021-03-30 | 2023-11-17 | 华为技术有限公司 | Method for establishing access point candidate set and communication device |
| CN114007248B (en) * | 2021-09-16 | 2022-12-27 | 荣耀终端有限公司 | Wi-Fi roaming method, electronic equipment and storage medium |
| CN113873609B (en) * | 2021-09-24 | 2023-11-03 | 新华三技术有限公司成都分公司 | Method and AC for guiding client to access AP |
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