CN103916816B - A kind of radio switch-in method and access controller - Google Patents
A kind of radio switch-in method and access controller Download PDFInfo
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- CN103916816B CN103916816B CN201410114839.8A CN201410114839A CN103916816B CN 103916816 B CN103916816 B CN 103916816B CN 201410114839 A CN201410114839 A CN 201410114839A CN 103916816 B CN103916816 B CN 103916816B
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Abstract
The present invention is applied to WLAN field, and there is provided a kind of radio switch-in method and access controller；The AC receives the certification request that mobile terminal is sent by the AP;The AC calculates the position of the mobile terminal, and the WLAN WLAN coverage that each AP is provided is determined respectively;The AC determines one or more AP of position of the WLAN coverage comprising the mobile terminal；The AC filters out the AP that the mobile terminal is able to detect that maximum signal from the AP of determination；The AC controls the AP that the mobile terminal access is filtered out.So, in the WLAN being made up of access controller AC and at least three wireless access point APs, if mobile terminal desires access to the WLAN, the mobile terminal for sending the certification request is directly accessed the AP filtered out by the AC, it is ensured that the good communication of the mobile terminal.
Description
Technical field
The invention belongs to WLAN field, more particularly to a kind of radio switch-in method and access controller.
Background technology
WLAN (Wireless Local Area Networks, WLAN) is particularly convenient data transmission system
System, it utilizes radio frequency（Radio Frequency, RF）Technology, replace old-fashioned copper twisted pairs got in the way（Coaxial）Institute
The LAN of composition so that WLAN can allow user to pass through it using simple access architecture, reach that " information is carry-on
Change, it is convenient walk all over the world " ideal state.
WLAN is by access controller（Wireless Access Controler, AC）With at least one nothing
Line access point（Wireless Access Point, AP）Set up；Wherein, AC controls each AP in the WLAN.
At present, it is typically that the AP in WLAN is artificially selected by user when accessing WLAN, control mobile terminal access selection
The AP gone out.When the AP that the mobile terminal has access in a wlan is more, it is difficult to quickly select optimal within a short period of time（Letter
Number maximum intensity）AP is simultaneously accessed.
The content of the invention
It is an object of the invention to provide a kind of radio switch-in method, selected with solving artificial AP various from WLAN
Optimal AP and access, the problem of losing time very much.
On the one hand, the present invention provides a kind of radio switch-in method, applied to wireless by access controller AC and at least three
The network of access point AP compositions, the radio switch-in method includes：
The AC receives the certification request that mobile terminal is sent by the AP;
The AC calculates the position of the mobile terminal, and the WLAN WLAN coverings that each AP is provided are determined respectively
Scope;
The AC determines one or more AP of position of the WLAN coverage comprising the mobile terminal；
The AC filters out the AP that the mobile terminal is able to detect that maximum signal from the AP of determination；
The AC controls the AP that the mobile terminal access is filtered out.
On the one hand, the present invention provides a kind of access controller, is wirelessly connect applied to by access controller AC and at least three
The network of access point AP compositions, the access controller includes：
Certification request receiving unit, for receiving the certification request that mobile terminal is sent by the AP;
Position units, the position for calculating the mobile terminal determines the WLAN that each AP is provided respectively
WLAN coverage;
Determining unit, one or more AP for determining position of the WLAN coverage comprising the mobile terminal；
Screening unit, maximum signal is able to detect that for filtering out the mobile terminal from the AP of determination
AP；
Access unit is controlled, for the AP for controlling the mobile terminal access to filter out.
Beneficial effects of the present invention：In the WLAN being made up of AC and at least three AP, if mobile terminal
The WLAN is desired access to, the AC receives the certification request that mobile terminal is sent, and then the AC by the AP
It can be filtered out according to the position where the mobile terminal, each AP position and each AP WLAN coverage provided：
The mobile terminal is able to detect that the AP of maximum signal；And then, the AC will send the mobile terminal of the certification request
It is directly accessed the AP filtered out, it is ensured that the good communication of the mobile terminal..
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
In required for the accompanying drawing that uses be briefly described, it should be apparent that, drawings in the following description are only some of the present invention
Embodiment, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these
Accompanying drawing obtains other accompanying drawings.
Fig. 1 is the first flow chart of radio switch-in method provided in an embodiment of the present invention；
Fig. 2 is the particular flow sheet of step S3 in radio switch-in method provided in an embodiment of the present invention；
Fig. 3 is the first composition structure chart of access controller provided in an embodiment of the present invention；
Fig. 4 is the composition structure chart of screening unit 24 in access controller provided in an embodiment of the present invention；
Fig. 5 is the composition structure chart of determining unit 23 in access controller provided in an embodiment of the present invention；
Fig. 6 is the first composition structure chart of position units 22 in access controller provided in an embodiment of the present invention；
Fig. 7 is second of composition structure chart of position units 22 in access controller provided in an embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.In order to illustrate technical solutions according to the invention, illustrated below by specific embodiment.
Radio switch-in method provided in an embodiment of the present invention, applied to by access controller AC and at least three wireless access
The network of point AP compositions；Wherein, the AC can control all AP in the network, including：Control each AP allows which movement of access
Terminal, controls each AP to allow data communication between the quantity of mobile terminal of access, control AP etc..
Fig. 1 show the present embodiment provide radio switch-in method implementation process, for the ease of description, illustrate only with
The related part of the embodiment of the present invention, radio switch-in method provided in an embodiment of the present invention includes：
S1, the AC receive the certification request that mobile terminal is sent by the AP.
Specifically, when mobile terminal desires access to some AP, the AC can receive mobile terminal transmission by the AP
Certification request.If the mobile terminal can retain the certification of the mobile terminal by the certification of the AC, the AC；Together
When, because the AP for forwarding the certification request is not necessarily the AP that the mobile terminal is best suitable for access in the network（Differ
Surely it is：The mobile terminal is able to detect that the AP of maximum signal in the network）.So as in order to realize the movement
Terminal is connected with being best suitable for the AP of access, it is ensured that the mobile terminal can carry out optimal data communication, and the AC obtains institute
State the position of mobile terminal.
S2, the AC calculates the position of the mobile terminal, and the WLAN coverage that each AP is provided is determined respectively.
Specifically, when each mobile terminal desires access to some AP, the AC can receive mobile terminal transmission
Certification request, the WLAN coverage that the AC can obtain the signal intensity of AP offers and provide from each AP again.Meanwhile,
If the mobile terminal has GPS location function, the AC can be directly from mobile terminal described in the acquisition for mobile terminal
GPS location, the AC regard the GPS location got as the position of the mobile terminal.If mobile terminal is fixed without GPS
Bit function, the AC can calculate the position of the mobile terminal.
In a preferred embodiment, the step of AC calculates the position of the mobile terminal, be specially：
The AC obtains AP GPS location；
The AC adjusts AP signal intensity to detect the AP to the distance of the mobile terminal；
The AC according at least three AP GPS location and at least three AP arrive respectively the mobile terminal away from
From calculating the position of the mobile terminal.
Specifically, the mobile terminal does not have GPS location function；Under normal circumstances, AP carries GPS location function.Institute
State the GPS location that AC obtains each AP respectively；The AC controls AP to adjust AP signal intensity（Adjust at least three AP letter
Number intensity）, determine the mobile terminal to the AP of adjustment signal intensity distance respectively（Specifically, by adjusting AP letter
Number intensity, the signal of the AP can be received and can not receive the critical condition of the signal of the AP by finding out mobile terminal, and AC is obtained
The scope for taking the signal that the AP can be provided under the critical condition to be covered（The scope that the signal is covered is disc）Radius,
Distance using the radius as the mobile terminal to the AP of adjustment signal intensity）；So as in known each adjustment signal
, can be according to the mobile terminal determined to the AP for adjusting signal intensity in the case of the AP of intensity GPS location
Distance calculate the position of the mobile terminal（GPS location）；
In a preferred embodiment, if some AP has at least three omnidirectional antennas（At every omnidirectional antenna
In diverse location, the GPS location of every omnidirectional antenna can be got in advance）, by each omnidirectional antenna for adjusting the AP
Signal intensity determine the mobile terminal respectively to the distance of each omnidirectional antenna of the AP so that in the every of the known AP
, can be according to the distance meter of each omnidirectional antenna of the mobile terminal to the AP in the case of the GPS location of individual omnidirectional antenna
Calculate the position of the mobile terminal（GPS location）.
In a preferred embodiment, if some AP has at least two directional aerials（Every directional antennae
In diverse location, the GPS location of the directional aerial of every one-way radiation can be got in advance）, by adjusting the every of the AP
The signal intensity of individual directional aerial determines the mobile terminal to the distance of each directional aerial of the AP respectively, so that
, can be according to each orientation day of the mobile terminal to the AP in the case of the GPS location of each directional aerial for knowing the AP
The distance of line calculates the position of the mobile terminal（GPS location）.
In a preferred embodiment, if some AP has the directional aerial of one-way radiation（One-way radiation is determined
It can be got in advance to the GPS location of antenna）, institute is determined by adjusting the signal intensity of directional aerial of the one-way radiation
Mobile terminal is stated to the distance of the directional aerial of the one-way radiation；So as in the GPS of the directional aerial of a known one-way radiation
In the case of position, the position of the mobile terminal can be calculated according to the distance of the mobile terminal to the directional aerial
（GPS location）.
In an embodiment of the present invention, the radio switch-in method also includes：
When the mobile terminal enters and/or left the WLAN coverage that an AP is provided, the AC recalculates institute
State the position of mobile terminal.
Specifically, when some shifting in the network being made up of access controller AC and at least three wireless access point APs
Dynamic terminal is after some AP WLAN coverages provided are left, and the AC can recalculate the position of the mobile terminal, and according to
This re-executes step S2, step S3 and step S4 and is able to detect that maximum signal to filter out the mobile terminal again
AP；And then when performing step S5, the AC accesses the mobile terminal AP newly filtered out, disconnects the mobile terminal
It is connected with the old AP filtered out WLAN.
Similarly, when mobile terminal enters the WLAN coverage that some AP is provided, the AC can recalculate the shifting
Moving the position of terminal, and re-executing step S2, step S3 and step S4 according to this can be examined with filtering out the mobile terminal again
Measure the AP of maximum signal；And then when performing step S5, the AC accesses the mobile terminal AP newly filtered out,
The WLAN for disconnecting the mobile terminal with the old AP filtered out is connected.
S3, the AC determine one or more AP of position of the WLAN coverage comprising the mobile terminal.
Specifically, it is determined that after the position of the mobile terminal, at the same the WLAN coverage provided in each AP it
Afterwards, it can determine that out the position that the WLAN coverage which AP is provided includes the mobile terminal.
Fig. 2 shows the idiographic flow of step S3 in the radio switch-in method that the present embodiment is provided, for the ease of describing, only
Show the part related to the embodiment of the present invention.
In an embodiment of the present invention, the one or more of position of the WLAN coverage comprising the mobile terminal are determined
The step of AP, it is specially：
S31, the AC calculates the quantity that each AP has accessed mobile terminal respectively；
S32, the AC determine WLAN coverage comprising the mobile terminal it is position, accessed quantity be less than access
One or more AP of threshold value.
In the present embodiment, the AC, which can count each AP in advance, allows most quantity of access, i.e., described AC statistics is every
Individual AP access threshold value；Then the quantity that each AP has been accessed is monitored in real time（The number of the mobile terminal accessed）.For
Some AP of position of the WLAN coverage comprising the mobile terminal, if the number that the AP has accessed mobile terminal reaches this
AP allows most quantity of access（The access threshold value of the AP）, then the AP is abandoned.
Therefore, for one or more AP of position of the WLAN coverage comprising the mobile terminal, the AC retains
AP at least have the characteristics that：The quantity that the AP has accessed mobile terminal allows to access the most most of mobile terminal less than the AP
Amount（The access threshold value of the AP）.
So as to, the AC using the AP of reservation as determination AP.
S4, the AC filters out the AP that the mobile terminal is able to detect that maximum signal from the AP of determination.
Specifically, APs of the AC for reservation（The AP of the determination）, led to according to WLAN protocol and mobile terminal
Letter；The AC can be learnt by the communication with mobile terminal：The mobile terminal is able to detect that maximum signal
AP。
In an alternative embodiment of the invention, if the AC is not communicated with screening by WLAN protocol with mobile terminal
Go out the AP of maximum signal, but the AC by each AP signal intensities provided and the mobile terminal to each described
The AP of determination distance screens the AP of maximum signal, then the mobile terminal is filtered out from the AP of determination to detect
To maximum signal AP the step of be specially：
The AC determines the signal intensity that each AP is provided respectively；
The AC calculates the mobile terminal to the AP of each determination distance；
The AC according to the AP of the determination signal intensities provided and the mobile terminal to the AP of the determination away from
From filtering out the AP that the mobile terminal is able to detect that maximum signal.
Specifically in the present embodiment, because the AC can communicate with each AP, therefore, the AC can know each AP
The signal intensity of offer（That is the signal intensity of AP signal sources）.Because each AP is respectively provided with GPS location function, each AP can be surveyed
Go out the GPS location of oneself, separately due to having calculated that the position of the mobile terminal in step s 2, therefore, it can according to AP's
The position of GPS location and the mobile terminal calculates the mobile terminal to the AP of each determination distance.
In such manner, it is possible to the signal intensity provided according to the AP of each determination（That is the signal intensity of AP signal sources）And institute
Mobile terminal is stated to the AP of each determination distance, determines that the mobile terminal is able to detect that each determination
AP signal intensity, then can determine that the mobile terminal is able to detect that the AP of maximum signal.
S5, the AC control the AP that the mobile terminal access is filtered out.
Specifically, it is to be determined go out the mobile terminal be able to detect that the AP of maximum signal（The AP filtered out）It
Afterwards, the AC accesses mobile terminal the AP filtered out by force.
In addition when the mobile terminal enters and/or left the WLAN coverage that an AP is provided, state AC and count again
The position of the mobile terminal is calculated, so that the AC, which can redefine out the mobile terminal, is able to detect that maximum signal
AP（The AP newly filtered out）, the AP that the AC by force newly filters out the mobile terminal access mobile terminal, disconnection
The mobile terminal is connected with the old AP filtered out WLAN.
As the embodiment of the invention, maximum signal is able to detect that filtering out the mobile terminal
In the step of AP, the AP for considering each determination has accessed the quantity of mobile terminal, the letter that the AP of the determination is provided
Number intensity and the mobile terminal filter out the optimal AP of the mobile terminal access to the AP of determination distance.
For example：For the AP according to the AP of the determination signal intensities provided and the mobile terminal to the determination
Distance filter out：The mobile terminal is able to detect that the AP of maximum signal, and the mobile terminal is able to detect that secondary
The AP of maximum signal；If the quantity that the AP of the maximum signal has accessed mobile terminal is strong close to the peak signal
The AP of degree access threshold value（Represent the bandwidth that each AP for having accessed maximum signal mobile terminal can be used
（Upload the speed of data and the speed of downloading data）It is very small）If the AP of this maximum signal has accessed movement eventually
Access threshold value of the quantity at end much smaller than the AP of this maximum signal（Represent each and accessed this maximum signal
The bandwidth that AP mobile terminal can be used（Upload the speed of data and the speed of downloading data）It is very big）, so as to select
The optimal AP that the AP of secondary maximum signal is accessed as the mobile terminal.The AC controls the mobile terminal access time most
The AP of big signal intensity.
Those of ordinary skill in the art are further appreciated that all or part of step realized in above-described embodiment method is can
To instruct the hardware of correlation to complete by program, described program can be stored in a computer read/write memory medium
In, described storage medium, including ROM/RAM, disk, CD etc..
It should be noted that the radio switch-in method of the present embodiment offer and the access controller that the present embodiment is provided are mutual
It is applicable.
The access controller that the present embodiment is provided, applied to by access controller AC and at least three wireless access point AP groups
Into network.Fig. 3 shows the first the composition structure for the access controller that the present embodiment is provided, and for the ease of description, only shows
The part related to the embodiment of the present invention is gone out, the access controller includes：
Certification request receiving unit 21, for receiving the certification request that mobile terminal is sent by the AP;
Position units 22, the position for calculating the mobile terminal determines the WLAN that each AP is provided respectively
Network WLAN coverage;
Determining unit 23, one or more AP for determining position of the WLAN coverage comprising the mobile terminal；
Screening unit 24, maximum signal is able to detect that for filtering out the mobile terminal from the AP of determination
AP；
Access unit 25 is controlled, for the AP for controlling the mobile terminal access to filter out.
In an embodiment of the present invention, Fig. 4 shows the group of screening unit 24 in the access controller that the present embodiment is provided
Into structure, for the ease of description, the part related to the embodiment of the present invention is illustrate only, the screening unit 24 includes：
Signal intensity unit 241, for determining the signal intensity that each AP is provided respectively；
Metrics calculation unit 242, for calculating the mobile terminal to the AP of each determination distance；
Intensity screening unit 243, for according to the AP of the determination signal intensities provided and the mobile terminal to institute
The AP of determination distance is stated, the AP that the mobile terminal is able to detect that maximum signal is filtered out.
In an embodiment of the present invention, Fig. 5 shows the group of determining unit 23 in the access controller that the present embodiment is provided
Into structure, for the ease of description, the part related to the embodiment of the present invention is illustrate only, the determining unit 23 includes：
Amount calculation unit 231, the quantity of mobile terminal has been accessed for calculating each AP respectively；
Determination subelement 232, for determine WLAN coverage comprising the mobile terminal it is position, accessed quantity
Less than one or more AP of access threshold value.
In an embodiment of the present invention, Fig. 6 shows the of position units 22 in the access controller that the present embodiment is provided
One kind composition structure, for the ease of description, illustrate only the part related to the embodiment of the present invention, the position units 22 are wrapped
Include：
Location subunit 221, the GPS location for obtaining AP；
Apart from detection unit 222, for adjusting AP signal intensity with detect the AP to the mobile terminal away from
From；
Position calculation unit 223, arrive respectively for the GPS location according at least three AP and at least three AP described in
The distance of mobile terminal, calculates the position of the mobile terminal.
In an embodiment of the present invention, Fig. 7 shows the of position units 22 in the access controller that the present embodiment is provided
Two kinds of composition structures, for the ease of description, illustrate only the part related to the embodiment of the present invention, the position units 22 are wrapped
Include：
First position unit 224, when entering and/or leave the WLAN coverage that an AP is provided for mobile terminal,
The AC recalculates the position of the mobile terminal.
It will be appreciated by those skilled in the art that each list included by the access controller provided for foregoing invention embodiment
Member is simply divided according to function logic, but is not limited to above-mentioned division, as long as corresponding function can be realized i.e.
Can；In addition, the specific name of each functional unit is also only to facilitate mutually distinguish, the protection model being not intended to limit the invention
Enclose.
In embodiments of the present invention, in the wireless local being made up of access controller AC and at least three wireless access point APs
In network, if mobile terminal desires access to the WLAN, the AC receives what mobile terminal was sent by the AP
Certification request, and then the AC can be according to the position where the mobile terminal, each AP position and each AP offer
WLAN coverage is filtered out：The mobile terminal is able to detect that the AP of maximum signal；And then, the AC will be sent should
The mobile terminal of certification request is directly accessed the AP filtered out.In addition, being carried when the mobile terminal enters and/or leaves an AP
During the WLAN coverage of confession, the AC can recalculate the position of the mobile terminal；Then the AC redefines out institute
State the AP that mobile terminal is able to detect that maximum signal（The AP newly filtered out）, the AC is by mobile terminal by force by institute
The AP that mobile terminal access is newly filtered out is stated, the mobile terminal is disconnected and is connected with the old AP filtered out WLAN.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
Some equivalent substitutes or obvious modification are made on the premise of not departing from present inventive concept, and performance or purposes are identical, all should
It is considered as belonging to the scope of patent protection that the present invention is determined by the claims submitted.
Claims (10)
1. a kind of radio switch-in method, it is characterised in that applied to by access controller AC and at least three wireless access point APs
The network of composition, the radio switch-in method includes：
The AC receives the certification request that the mobile terminal is sent by the AP accessed selected by mobile terminal；
The AC calculates the position of the mobile terminal, and the WLAN WLAN covering models that each AP is provided are determined respectively
Enclose；
The AC determines one or more AP of position of the WLAN coverage comprising the mobile terminal；
The AC filters out the AP that the mobile terminal is able to detect that maximum signal from the AP of determination；
The AC controls the AP that the mobile terminal access is filtered out.
2. radio switch-in method as claimed in claim 1, it is characterised in that the mobile terminal is filtered out from the AP of determination
The step of being able to detect that the AP of maximum signal, be specially：
The AC determines the signal intensity that each AP is provided respectively；
The AC calculates the mobile terminal to the AP of each determination distance；
The AC, to the AP of determination distance, is sieved according to the AP of the determination signal intensities provided and the mobile terminal
Select the AP that the mobile terminal is able to detect that maximum signal.
3. radio switch-in method as claimed in claim 1, it is characterised in that determine WLAN coverage comprising described mobile whole
The step of one or more AP of the position at end, it is specially：
The AC calculates the quantity that each AP has accessed mobile terminal respectively；
The AC determine WLAN coverage comprising the mobile terminal it is position, accessed quantity be less than access threshold value one
Individual or multiple AP.
4. radio switch-in method as claimed in claim 1, it is characterised in that the AC calculates the position of the mobile terminal
Step, be specially：
The AC obtains AP global position system GPS position；
The AC adjusts AP signal intensity to detect the AP to the distance of the mobile terminal；
The AC arrives the distance of the mobile terminal according at least three AP GPS location and at least three AP respectively, meter
Calculate the position of the mobile terminal.
5. radio switch-in method as claimed in claim 1, it is characterised in that the radio switch-in method also includes：
When mobile terminal enters and/or left the WLAN coverage that an AP is provided, the AC recalculates described mobile whole
The position at end.
6. a kind of access controller, it is characterised in that applied to by access controller AC and at least three wireless access point AP groups
Into network, the access controller includes：
Certification request receiving unit, receives what the mobile terminal was sent for an AP by being accessed selected by mobile terminal
Certification request；
Position units, the position for calculating the mobile terminal determines the WLAN WLAN that each AP is provided respectively
Coverage；
Determining unit, one or more AP for determining position of the WLAN coverage comprising the mobile terminal；
Screening unit, the AP of maximum signal is able to detect that for filtering out the mobile terminal from the AP of determination；
Access unit is controlled, for the AP for controlling the mobile terminal access to filter out.
7. access controller as claimed in claim 6, it is characterised in that the screening unit includes：
Signal intensity unit, for determining the signal intensity that each AP is provided respectively；
Metrics calculation unit, for calculating the mobile terminal to the AP of each determination distance；
Intensity screening unit, for according to the AP of the determination signal intensities provided and the mobile terminal to the determination
AP distance, filters out the AP that the mobile terminal is able to detect that maximum signal.
8. access controller as claimed in claim 6, it is characterised in that the determining unit includes：
Amount calculation unit, the quantity of mobile terminal has been accessed for calculating each AP respectively；
Determination subelement, for determine WLAN coverage comprising the mobile terminal it is position, accessed quantity be less than connect
Enter one or more AP of threshold value.
9. access controller as claimed in claim 6, it is characterised in that the position units include：
Location subunit, the global position system GPS position for obtaining AP；
Apart from detection unit, for adjusting AP signal intensity to detect the AP to the distance of the mobile terminal；
Position calculation unit, arrives described mobile whole respectively for the GPS location according at least three AP and at least three AP
The distance at end, calculates the position of the mobile terminal.
10. access controller as claimed in claim 6, it is characterised in that the position units include：
First position unit, when entering and/or leave the WLAN coverage that an AP is provided for mobile terminal, the AC weights
Newly calculate the position of the mobile terminal.
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| CN201410114839.8A CN103916816B (en) | 2014-03-25 | 2014-03-25 | A kind of radio switch-in method and access controller |
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| CN201410114839.8A CN103916816B (en) | 2014-03-25 | 2014-03-25 | A kind of radio switch-in method and access controller |
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