CN104661323B - Devices and methods therefor is established in a kind of wireless service in wlan network - Google Patents
Devices and methods therefor is established in a kind of wireless service in wlan network Download PDFInfo
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- CN104661323B CN104661323B CN201310596470.4A CN201310596470A CN104661323B CN 104661323 B CN104661323 B CN 104661323B CN 201310596470 A CN201310596470 A CN 201310596470A CN 104661323 B CN104661323 B CN 104661323B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/11—Allocation or use of connection identifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
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Abstract
The present invention provides the wireless service method for building up and its device in a kind of wlan network.Method includes：AC distributes identical basic service set BSSID and identifies at least two AP, and same wireless service is tied to the radio frequency of AP to eating dishes without rice or wine.The association request that the wireless terminal that the scanning that AP is sent is identified to BSSID is reached the standard grade is received, judges whether the identical association request that same wireless terminal is sent by least two AP.If there is an AP, then it is continuing with the association request of an AP response wireless terminal, and prevents the association request of other AP response wireless terminals.If there is at least two AP, then determines that an AP at least two AP responds the association request of wireless terminal according to the data message signal condition sent at least two AP, other AP is prevented to respond wireless terminal association request.Zero packet loss when wireless terminal roams in AC, and the business of the network equipment is not influenced by roaming, low in input cost.
Description
Technical field
The present invention relates to the wireless service in the wlan network communications field more particularly to a kind of wlan network establish device and
Its method.
Background technology
Wireless access point AP（Access Point）It is a wireless transmitting-receiving equipments.It will be from cable network（Such as
Internet）The data conversion received is sent at wireless signal, and the wireless signal received is converted into data and is forwarded to
Cable network.Wireless network access controller AC（Access Controller）For completing certification to wireless user/match
/ the functions such as data forwarding are set, are played the role of central controlled.Wireless access point controls and supply CAPWAP (Control And
Provisioning of Wireless Access Points Protocol Specification) between AP and AC
Communication provides general encapsulation and transmission mechanism.It is that AC is used for managing and controlling the standardization agreement that AP is used.
Referring to Fig. 1, a wireless terminal in existing wlan network is associated with AP1, then is connected to AC by AP1.Institute
It states wireless terminal and disconnects and be associated with AP1, associated with the AP2 that same wireless controller AC is connected, the wireless terminal is associated with
Process to AP2 is to be roamed in AC.Roaming can be divided into common roaming and fast roaming in the AC, the time packet commonly roamed
Include MAC layer certification, AP associations, 802.1x user authentication, 4-Way Handshake；The fast roaming time include MAC layer certification, AP association,
4-Way Handshake.The time of fast roaming does not include 802.1x user authentication, and roaming time wants short, therefore fast roaming is than common
Roaming in packet loss in roam procedure will lack.The technology of fast roaming is on AP and wireless terminal while to cache 802.1x identity and recognize
The PMKSA of card, wireless terminal to AP by providing a string of PMK security associations PMKSA (PMK Security when roaming occurs
Association the key) derived reaches 802.1x authentication purposes, saves the network equipment and recognizes with remote customer dialing
Demonstrate,prove Radius（Remote Authentication Dial In User Service）Server carries out 802.1x authentications
The required time.
Fast roaming roams in that packet loss in roam procedure is few than common, can more ensure the continuity of business.If
There is no exception in Fast roaming procedure, roaming time is about 50ms, it will lose about 3 messages.But for some height
The application of real-time, for example for high fidelity speech, packet loss will make a big impact to service effectiveness.
In addition, condition of the wireless network card when judging whether to occur to roam in AC due to different vendor's manufacture is different, AC
Message interaction in interior roaming is also variant, this wireless network card for just often resulting in some manufacturers cannot succeed to be set in wlan network
Standby upper carry out fast roaming, also the wireless network card of some manufacturers do not support fast roaming.Wlan network equipment will be adapted to not
With the wireless network card of manufacturer, guarantee business is not influenced by roaming, and input cost is very high.
Invention content
In view of this, devices and methods therefor is established in the wireless service that the present invention is provided in a kind of wlan network, it can be real
Zero packet loss when existing wireless terminal roams in AC, and the business of the network equipment is not influenced by roaming, low in input cost.
The present invention provides the wireless service method for building up in a kind of wlan network, is applied to wireless network access controller
AC, the AC control at least two wireless access point APs, the method includes：
The AC distributes identical basic service set BSSID and identifies at least two AP, and same wireless service is tied up
Surely the radio frequency of AP is arrived to eating dishes without rice or wine；
The association request that the wireless terminal that the scanning that the AP is sent is identified to the BSSID is reached the standard grade is received, and judgement is
It is no that there are the identical association requests that same wireless terminal is sent by least two AP；
If there is only the identical association request that an AP is sent, it is continuing with one AP responses wireless terminal
Association request, and prevent other AP response wireless terminal association request；
If there is the identical association request that at least two AP are sent, then according to the data sent at least two AP
Message signals situation determines the association request of the response wireless terminals of an AP at least two AP, and other AP is prevented to ring
Answer the association request of wireless terminal.
Further, of the present invention that an AP is determined according to the data message signal condition sent at least two AP
Including：
According to the average signal strength RSSI and Signal to Noise Ratio (SNR) of the data message above sent, the best AP conducts of selection signal
Determine AP；Or
According to the average signal strength RSSI and Signal to Noise Ratio (SNR) and load balancing condition of the data message above sent, according with
Under the conditions of closing load balancing, the best AP of selection signal is as determining AP.
Further, the method for the invention further includes：
If wireless terminal is within the period by determining that the RSSI and SNR of the data message sent on AP are default less than administrator
Thresholding is diffused out, then allows the data message for sending the wireless terminal on other described AP；
It normally forwards the wireless terminal by the data message that is sent on former AP, and extracts the data message sent on other AP
RSSI and SNR after abandon the data message；
If the RSSI and SNR of the data message for occurring sending on other AP in the period diffuse in thresholding higher than administrator is preset,
The association request of wireless terminal is responded higher than the AP for diffusing in thresholding, and the association for preventing former AP and other AP from responding wireless terminal is asked
It asks.
Further, the RSSI and SNR of the present invention such as the data message sent on the new AP in the period are pre- less than administrator
If diffuse in thresholding, normally forward the wireless terminal by the data message that is sent on former AP, and extract and send datagram on new AP
The air message is abandoned after the RSSI and SNR of text.
Further, the method for the invention further includes：
If the wireless terminal requests are offline, the wireless terminal configurations are deleted, to all same wireless services of binding
AP sends configuration, allows all AP of all same wireless services of binding that can respond the association request of wireless terminal.
The present invention also provides the wireless services in a kind of wlan network to establish device, is applied to wireless network access controller
AC, the AC control at least two wireless access point APs, and described device includes：
Allocation unit is identified, is identified at least two AP for distributing identical basic service set BSSID, it will be same
Wireless service is tied to the radio frequency of AP to eating dishes without rice or wine；
Judging unit is asked, what the wireless terminal that the scanning for receiving the AP transmissions is identified to the BSSID was reached the standard grade
Association request, and judge whether the identical association request that same wireless terminal is sent by least two AP；
First request-response unit, if for there is only the identical association request that an AP is sent, being continuing with
The association request of one AP responses wireless terminal, and prevent the association request of other AP response wireless terminals；
Second request-response unit, the identical association request for being sent if there is at least two AP, then according to institute
It states the data message signal condition sent at least two AP and determines that an AP at least two AP responds wireless terminal
Association request, and prevent the association request of other AP response wireless terminals.
Further, according to the data message sent at least two AP in the second request-response unit of the present invention
Signal condition determines that an AP includes：
According to the average signal strength RSSI and Signal to Noise Ratio (SNR) of the data message above sent, the best AP conducts of selection signal
Determine AP；Or
According to the average signal strength RSSI and Signal to Noise Ratio (SNR) and load balancing condition of the data message above sent, according with
Under the conditions of closing load balancing, the best AP of selection signal is as determining AP.
Further, device of the present invention further includes：
Roam judging unit, if for wireless terminal within the period by determine the RSSI of data message sent on AP and
SNR is default less than administrator to diffuse out thresholding, then the data message for allowing to send the wireless terminal on other described AP；
Message retransmission unit for normally forwarding the wireless terminal by the data message that is sent on former AP, and extracts it
The data message is abandoned after the RSSI and SNR of the data message that he send on AP；
Determination unit is roamed, for occurring the RSSI and SNR of the data message sent on other AP in such as period higher than management
Member is preset to diffuse in thresholding, responds the association request of wireless terminal higher than the AP for diffusing in thresholding, and former AP and other AP is prevented to ring
Answer the association request of wireless terminal.
Further, roaming determination unit of the present invention is additionally operable to the data message as sent on the new AP in the period
RSSI and SNR diffuse in thresholding less than administrator is preset, normally forward the wireless terminal to pass through the datagram sent on former AP
Text, and abandon the air message after extracting the RSSI and SNR that send data message on new AP.
Further, device of the present invention further includes：
The offline unit of terminal, it is offline for such as wireless terminal requests, the wireless terminal configurations are deleted, are tied up to all
The AP of fixed same wireless service sends configuration, allows all AP of all same wireless services of binding that can respond wireless terminal
Association request.
By above technical scheme as it can be seen that the present invention enables the AP radio frequencies of all same wireless services of binding under AC controls to eating dishes without rice or wine
Identical BSSID marks are provided, wireless terminal scanning sends the association request reached the standard grade after being identified to BSSID.For wireless terminal
For, since the BSSID marks scanned are identical, although it is to send datagram on the different AP of same wireless service by binding
Text, but feel only to access wlan network via an AP always.It roams when in wireless terminal generation AC, is passed through to determine by AC
Which AP receives the data message sent on wireless terminal, without sending the AP of data message in wireless terminal selection.Wireless terminal
Data message is determined completely by AC after calculating via being sent on which platform AP.Since wireless terminal occurs to roam in AC, switch AP
It is transparent for wireless terminal, is uploaded by AC control data messages, data message is uploaded without interruption, so just there is no numbers
According to the problem of packet loss and different vendor wireless network card roams compatibility issue.
Description of the drawings
The schematic diagram roamed in existing AC in Fig. 1 wlan networks；
The flow chart of Fig. 2 the method for the present invention；
The system construction drawing of Fig. 3 apparatus of the present invention.
Specific implementation mode
The present invention enables the AP radio frequencies of all same wireless services of binding under AC controls provide identical BSSID marks to eating dishes without rice or wine
Know, wireless terminal scanning sends the association request reached the standard grade after being identified to BSSID.For wireless terminal, due to what is scanned
BSSID marks are identical, although it is to send data message on the different AP of same wireless service by binding, feel always only
Wlan network is accessed via an AP.It roams when in wireless terminal generation AC, when sending the AP of data message in switching, need not send out
The AP and wireless terminal of raw switching are operated.The data message of wireless terminal via sent on any platform AP completely by AC through calculating
After determine.Since wireless terminal occurs to roam in AC, switching AP is transparent for wireless terminal, and data message is controlled by AC
It uploads, data message is uploaded without interruption, so the problem of data packetloss is just not present and different vendor's wireless network card roaming are simultaneous
Capacitive problem.
Referring to Fig. 2, the present invention also provides the wireless service method for building up in a kind of wlan network, are applied to wireless network and visit
Ask that controller AC, the AC control at least two wireless access point APs.The method includes the steps：
201, the AC distributes identical basic service set BSSID and identifies at least two AP, by same wireless clothes
Business is tied to the radio frequency of AP to eating dishes without rice or wine.
The basic service set identification BSSID is one kind of SSID, and one can be generated by referring to after radio frequency binds a wireless service
The unique mark of a class MAC Address, for indicating the wireless service on the radio frequency in eating dishes without rice or wine.BSSID marks are to use
In distinguishing different wireless networks, that is, it is used for distinguishing different wireless services.When AP is configured with different BSSID can be into
Enter different networks, and BSSID is usually broadcast out by AP, the wireless terminal scanned to same BSSID can just communicate.
202, the association request that the wireless terminal that the scanning that the AP is sent is identified to the BSSID is reached the standard grade is received, and is sentenced
The disconnected identical association request sent by least two AP with the presence or absence of same wireless terminal.
The AP of the same wireless service of the binding sends beacon frame Beacon messages, use distributed it is identical
BSSID is identified.Beacon frame Beacon, the beacon for specifying the phase to send, can allow mobile workstation to learn the presence of the wireless service, from
And adjust parameter necessary to the network is added.
Wireless terminal scans the beacon frame Beacon messages identified to BSSID, attempts to reach the standard grade, and passes through the same nothing of binding
The AP of line service send association request on AC.The AP that same wireless terminal binds same wireless services possibly through at least two
Identical association request is sent on AC.
If 203, there is only the identical association requests that an AP is sent, it is continuing with AP response wireless terminals
Association request, and prevent the association request of other AP response wireless terminals.
204, the identical association request sent if there is at least two AP, then according to sending at least two AP
Data message signal condition determines the association request of the response wireless terminals of an AP at least two AP, and prevents other
AP responds the association request of wireless terminal.
It can be seen from the above, for wireless terminal, since the BSSID marks scanned are identical, although it is by tying up
Data message is sent on the different AP of fixed same wireless service, but feels only to access wlan network via an AP always.Work as nothing
Roaming in AC occurs for line terminal, and when sending the AP of data message in switching, the data message of wireless terminal on which platform AP via having sent
It is determined after calculating by AC entirely.Data message is uploaded without interruption, so the problem of data packetloss is just not present and different factories
Quotient's wireless network card roams compatibility issue.
Further, in the step 204 one is determined according to the data message signal condition sent at least two AP
A AP includes：
According to the average signal strength RSSI and Signal to Noise Ratio (SNR) of the data message above sent, the best AP conducts of selection signal
Determine AP.
Further, in the step 204 one is determined according to the data message signal condition sent at least two AP
A AP includes：
According to the average signal strength RSSI and Signal to Noise Ratio (SNR) and load balancing condition of the data message above sent, according with
Under the conditions of closing load balancing, the best AP of selection signal is as identified AP.
In a specific embodiment of the invention, the load is weighed by the quantity of the AP wireless terminals reached the standard grade, and is loaded
Equilibrium condition refers to that the quantity for the wireless terminal of each AP at least two AP reached the standard grade is close（Each AP's reaches the standard grade
The number differences of wireless terminal are smaller, and load is more balanced）.Such as there are AP1 and AP2,5 wireless terminals, AP2 are associated on AP1
2 wireless terminals of upper association, if average signal strength RSSI and the Signal to Noise Ratio (SNR) difference of the data message sent on AP1 and AP2
Less, that is, it selects AP2 as AP is determined, 5 wireless terminals is still associated on AP1,3 wireless terminals is associated on AP2, ensures in this way
The quantity of the associated wireless terminals of AP1 and AP2 is more nearly, more by the number differences of AP1 and the AP2 wireless terminal reached the standard grade
It is small.
Further, the method further includes：
If 205, wireless terminal is less than within the preset period by the RSSI and SNR of the data message sent on determining AP
Administrator is default to diffuse out thresholding, then allows the data message that the wireless terminal is sent on other described AP.
If it is determined that the average signal strength RSSI and Signal to Noise Ratio (SNR) of the data message sent on AP are default less than administrator unrestrained
Go out thresholding, then show that the wireless client may need to carry out roaming in AC, needs to be switched to other AP from determining AP.It is described
Period is that administrator is default according to system requirements.
206, it normally forwards the wireless terminal by the data message that is sent on former AP, and extracts the data sent on other AP
The data message is abandoned after the RSSI and SNR of message.
Due to not can determine that whether the wireless client needs to be switched to other AP from determining AP at this time, in order to prevent
Data message packet loss still normally forwards the wireless terminal to pass through the data message that is sent on former AP.But it is also extracted simultaneously
He send the signal RSSI and SNR of data message and needs to carry out AP switchings to be confirmed whether to determine on AP, but does not receive and pass through it
The data message that he send on AP.
207, the RSSI and SNR for such as occurring the data message sent on other AP in the period diffuse in door higher than administrator is preset
Limit responds the association request of wireless terminal higher than the AP for diffusing in thresholding, and prevents the pass of former AP and other AP response wireless terminals
Connection request.
If the RSSI and SNR that occur the data message sent on an AP in the period diffuse in door higher than administrator is preset
Limit shows that determination needs to carry out AP switchings, and the association request of new AP responses wireless terminal, wireless terminal is by new AP on AC
Data message is sent, other AP other than new AP is prevented to respond the association request of wireless terminal.
208, the RSSI and SNR of the data message sent on other AP as described in the period diffuse in door less than administrator is preset
Limit, return to step 206.
If the RSSI and SNR of the data message sent on other described AP in the period diffuse in door less than administrator is preset
Limit, shows that AP switchings, return to step 206 need not be carried out.
The method further includes：
If the wireless terminal requests are offline, the wireless terminal configurations are deleted, to all same wireless services of binding
AP sends configuration, allows all AP of all same wireless services of binding that can respond the association request of wireless terminal.
Referring to Fig. 3, correspond to the above method, the present invention also provides the wireless services in a kind of wlan network to establish device,
Applied to wireless network access controller AC, the AC controls at least two wireless access point APs.The AC includes on hardware
CPU, memory, nonvolatile memory and other hardware, described device include logically：
Allocation unit is identified, is identified at least two AP for distributing identical basic service set BSSID, it will be same
Wireless service is tied to the radio frequency of AP to eating dishes without rice or wine.
Judging unit is asked, what the wireless terminal that the scanning for receiving the AP transmissions is identified to the BSSID was reached the standard grade
Association request, and judge whether the identical association request that same wireless terminal is sent by least two AP.
First request-response unit, if for there is only the identical association request that an AP is sent, being continuing with
The association request of one AP responses wireless terminal, and prevent the association request of other AP response wireless terminals.
Second request-response unit, the identical association request for being sent if there is at least two AP, then according to institute
It states the data message signal condition sent at least two AP and determines that an AP at least two AP responds wireless terminal
Association request, and prevent the association request of other AP response wireless terminals.
Further, according to the data message signal feelings sent at least two AP in second request-response unit
Condition determines that an AP includes：
According to the average signal strength RSSI and Signal to Noise Ratio (SNR) of the data message above sent, the best AP conducts of selection signal
Determine AP；Or
According to the average signal strength RSSI and Signal to Noise Ratio (SNR) and load balancing condition of the data message above sent, according with
Under the conditions of closing load balancing, the best AP of selection signal is as determining AP.
Further, described device further includes：
Roam judging unit, if for wireless terminal within the period by determine the RSSI of data message sent on AP and
SNR is default less than administrator to diffuse out thresholding, then the data message for allowing to send the wireless terminal on other described AP.
Message retransmission unit for normally forwarding the wireless terminal by the data message that is sent on former AP, and extracts it
The data message is abandoned after the RSSI and SNR of the data message that he send on AP.
Determination unit is roamed, for occurring the RSSI and SNR of the data message sent on other AP in such as period higher than management
Member is preset to diffuse in thresholding, responds the association request of wireless terminal higher than the AP for diffusing in thresholding, and former AP and other AP is prevented to ring
Answer the association request of wireless terminal.
Further, the roaming determination unit is additionally operable to the RSSI of the data message as sent on the new AP in the period
Thresholding is diffused in less than administrator is preset with SNR, normally forwards the wireless terminal by the data message that is sent on former AP, and carry
The air message is abandoned after taking the RSSI and SNR that send data message on new AP.
Further, described device further includes：
The offline unit of terminal, it is offline for such as wireless terminal requests, the wireless terminal configurations are deleted, are tied up to all
The AP of fixed same wireless service sends configuration, allows all AP of all same wireless services of binding that can respond wireless terminal
Association request.
It is further illustrated the present invention below with specific example.
AC controls AP1 and AP2, and wireless service 1 is enabled to be tied to AP1 radio frequencies, and AC issues configuration to AP1 and increases wireless service 1,
Distribute BSSID1；Wireless service 1 is tied to AP2 radio frequencies, AC issues configuration to AP2 and increases wireless service 1, distributes BSSID1；
AP1 and AP2 is sent out the Beacon messages of wireless service 1, uses BSSID1.
Wireless terminal 1, which is scanned to the Beacon messages of BSSID1, reaches the standard grade, it is all receive wireless terminal 1 reach the standard grade request AP it is equal
AC will be sent in association request.AC receives wireless terminal 1 and reaches the standard grade after request, determines whether that AP1 and AP2 is sent on simultaneously.
If sending association request on only AP1, it is continuing with AP1 and responds request of reaching the standard grade, while issues configuration and AP2 is prevented to ring
Answer any message of above-mentioned wireless terminal 1.
If AP1 and AP2 all on send association request, the average signal strength RSSI and letter of the data message sent in basis
It makes an uproar than SNR, the best AP of selection signal is as determining AP.Assuming that the best AP of signal is AP1, then AP1 responds wireless terminal 1
Association request, and prevent the association request of AP2 response wireless terminals 1.
Whether wireless terminal 1 less than Administrator diffuses out door by the RSSI and SNR that are sent on AP1 in AC measurement periods
Limit.If less than thresholding is diffused out, AC issues configuration to AP2, allows the data message for sending wireless terminal 1 to send on AP2.
Still normally forwarding wireless terminal 1 passes through the air message that is sent on AP1 to AC.For wireless terminal 1 by sending on AP2
Air message abandons after then extracting RSSI and SNR information.
If wireless terminal logical 1 crosses RSSI and SNR the overflowing higher than Administrator of the air message sent on AP2 in the period
Enter thresholding, AC enables the association request of AP2 response wireless terminals 1, and prevents the association request of AP1 response wireless terminals 1.
If wireless terminal 1 is unrestrained less than Administrator by the RSSI and SNR of the air message sent on AP2 in the period
Enter thresholding, then still normally forwarding wireless terminal 1 passes through the air message that is sent on AP1 to AC.For wireless terminal 1 by being sent on AP2
Air message then extract RSSI and SNR information after abandon.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent substitution, improvement and etc. done should be included within the scope of protection of the invention god.
Claims (10)
1. the wireless service method for building up in a kind of wlan network, which is characterized in that it is applied to wireless network access controller AC,
The AC controls at least two wireless access point APs, the method includes：
The AC distributes identical basic service set BSSID and identifies at least two AP, and same wireless service is tied to
The radio frequency of AP is to eating dishes without rice or wine；
The association request that the wireless terminal that the scanning that the AP is sent is identified to the BSSID is reached the standard grade is received, and judges whether to deposit
In the identical association request that same wireless terminal is sent by least two AP；
If there is only the identical association request that an AP is sent, it is continuing with the pass of one AP responses wireless terminal
Connection request, and prevent the association request of other AP response wireless terminals；Wherein, the association of other AP response wireless terminals is prevented to ask
It asks, including：By issuing any message that configuration prevents other AP from responding wireless terminal to other AP；
If there is the identical association request that at least two AP are sent, then according to the data message sent at least two AP
Signal condition determines the association request of the response wireless terminals of an AP at least two AP, and other AP is prevented to respond nothing
The association request of line terminal.
2. according to the method described in claim 1, it is characterized in that, described according to the data message sent at least two AP
Signal condition determines that an AP includes：
According to the average signal strength RSSI and Signal to Noise Ratio (SNR) of the data message above sent, the best AP of selection signal is as determination
AP；Or
It is negative meeting according to the average signal strength RSSI and Signal to Noise Ratio (SNR) and load balancing condition of the data message above sent
It carries under equilibrium condition, the best AP of selection signal is as determining AP.
3. according to the method described in claim 2, it is characterized in that, the method further includes：
If wireless terminal is diffused out within the period by determining that the RSSI and SNR of the data message sent on AP are default less than administrator
Thresholding then allows the data message that the wireless terminal is sent on other described AP；
It normally forwards the wireless terminal by the data message that is sent on former AP, and extracts the data message sent on other AP
The data message is abandoned after RSSI and SNR；
If the RSSI and SNR of the data message for occurring sending on other AP in the period diffuse in thresholding higher than administrator is preset, it is higher than
The association request of the AP response wireless terminals of thresholding is diffused in, and prevents the association request of former AP and other AP response wireless terminals.
4. according to the method described in claim 3, it is characterized in that, the RSSI of the data message sent on the new AP in such as period
Thresholding is diffused in less than administrator is preset with SNR, normally forwards the wireless terminal by the data message that is sent on former AP, and carry
The air message is abandoned after taking the RSSI and SNR that send data message on new AP.
5. according to the method described in claim 1, it is characterized in that, the method further includes：
If the wireless terminal requests are offline, the wireless terminal configurations are deleted, to the AP hairs of all same wireless services of binding
Delivery is set, and allows all AP of all same wireless services of binding that can respond the association request of wireless terminal.
6. device is established in the wireless service in a kind of wlan network, which is characterized in that it is applied to wireless network access controller AC,
The AC controls at least two wireless access point APs, and described device includes：
Allocation unit is identified, is identified at least two AP for distributing identical basic service set BSSID, it will be same wireless
Service binding to AP radio frequency to eating dishes without rice or wine；
Judging unit is asked, the association reached the standard grade for receiving the wireless terminal that the scanning that the AP is sent is identified to the BSSID
Request, and judge whether the identical association request that same wireless terminal is sent by least two AP；
First request-response unit, if described for there is only the identical association request that an AP is sent, being continuing with
The association request of one AP response wireless terminal, and prevent the association request of other AP response wireless terminals；First request response
When unit prevents the association request of other AP response wireless terminals, other AP are prevented to respond wirelessly by issuing configuration to other AP
Any message of terminal；
Second request-response unit, the identical association request for being sent if there is at least two AP, then according to extremely
The data message signal condition sent on few two AP determines the association of the AP response wireless terminals at least two AP
Request, and prevent the association request of other AP response wireless terminals.
7. device according to claim 6, which is characterized in that in second request-response unit at least two according to
The data message signal condition sent on a AP determines that an AP includes：
According to the average signal strength RSSI and Signal to Noise Ratio (SNR) of the data message above sent, the best AP of selection signal is as determination
AP；Or
It is negative meeting according to the average signal strength RSSI and Signal to Noise Ratio (SNR) and load balancing condition of the data message above sent
It carries under equilibrium condition, the best AP of selection signal is as determining AP.
8. device according to claim 7, which is characterized in that described device further includes：
Judging unit is roamed, if for wireless terminal by the RSSI and SNR of the data message sent on determining AP within the period
Data message default less than administrator to diffuse out thresholding, then allowing to send the wireless terminal on other described AP；
Message retransmission unit for normally forwarding the wireless terminal by the data message that is sent on former AP, and extracts other AP
On abandon the data message after the RSSI and SNR of the data message that send；
Determination unit is roamed, it is pre- higher than administrator for occurring the RSSI and SNR of the data message sent on other AP in such as period
If diffuse in thresholding, respond the association request of wireless terminal higher than the AP for diffusing in thresholding, and former AP and other AP is prevented to respond nothing
The association request of line terminal.
9. device according to claim 8, which is characterized in that the roaming determination unit is additionally operable to as described in the period
The RSSI and SNR of the data message sent on new AP diffuse in thresholding less than administrator is preset, normally forward the wireless terminal logical
The data message sent on original AP is crossed, and the air message is abandoned after extracting the RSSI and SNR that send data message on new AP.
10. device according to claim 6, which is characterized in that described device further includes：
The offline unit of terminal, it is offline for such as wireless terminal requests, the wireless terminal configurations are deleted, it is same to all bindings
The AP of one wireless service sends configuration, allows all AP of all same wireless services of binding that can respond the association of wireless terminal
Request.
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| US11134449B2 (en) * | 2019-06-11 | 2021-09-28 | Qualcomm Incorporated | Controlling transmission power across basic service sets (BSSs) |
| CN112492585B (en) * | 2020-11-13 | 2022-11-25 | 杭州迪普科技股份有限公司 | Method for connecting wireless terminal with wireless local area network and network system |
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| CN1186906C (en) * | 2003-05-14 | 2005-01-26 | 东南大学 | Wireless LAN safety connecting-in control method |
| US7948953B2 (en) * | 2005-12-19 | 2011-05-24 | Aruba Networks, Inc. | System and method for advertising the same service set identifier for different basic service sets |
| CN101111056B (en) * | 2006-07-17 | 2010-05-12 | 西安电子科技大学 | Fast switching method for wireless local area network |
| US7912002B2 (en) * | 2007-05-07 | 2011-03-22 | Hitachi, Ltd. | System and method of QOS-based channel selection for WLAN access points or stations |
| CN101420694A (en) * | 2008-12-16 | 2009-04-29 | 天津工业大学 | WAPI-XG1 access and fast switch authentication method |
| CN101917695B (en) * | 2010-09-13 | 2012-10-24 | 上海市共进通信技术有限公司 | Fast switching method based on roaming of 802.11 standard wireless network |
| CN103167586B (en) * | 2013-03-01 | 2015-08-12 | 北京傲天动联技术股份有限公司 | A kind of access of the wireless terminal based on AP cluster and reselecting method |
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