CN1925683A - Switch-in point of centralized wireless LAN and method for detecting neighbor switch-in point thereof - Google Patents
Switch-in point of centralized wireless LAN and method for detecting neighbor switch-in point thereof Download PDFInfo
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Abstract
This invention discloses one integral WLAN test neighbor AP method, which comprises the following steps: receiving scanning orders, AP scans each signal channel in list till closure to achieve maximum scan time limit; AP goes back to scan signal channel. The invention can ensure each AP scan maximum scan time limit less than user set time without AP number.
Description
Technical field
The present invention relates to Centralized Wireless LAN, relate in particular to the method for detection neighboring access point in the Centralized Wireless LAN and WLS (Wireless LAN Switch, wireless local network switch) and the AP (Access Point, access point) that this method is used.
Background technology
WLAN (Wireless Local Area Network, WLAN (wireless local area network)) is the product that computer network combines with wireless communication technology, use wireless channel with connection of mobile terminal into network, have networking flexibility, cost is low, speed is high characteristics, be used widely in fields such as enterprise, education.
The classical group web frame of integral WLAN as shown in Figure 1, WLS is connected to each AP by finite element network, as the AP1 among the figure, AP2 and AP3, can be that direct connection also can be to connect by two-layer equipment or three-layer equipment therebetween.WLS carries out power control and channel management to the AP that it connected, and preserves the configuration parameter of AP; Can also carry out authentication and authentication to AP and the portable terminal that inserts, improve the fail safe of WLAN; WLS can also help AP to finish data forwarding in addition.Each AP is responsible for the interior portable terminal message transmission with the BSS (Basic Service Set, primary service area) of its covering.
The AP that WLS controls each connection carries out the neighbor AP detection, and testing result is mainly used to carry out power and channel control.In the prior art, AP sends probe requests thereby (Probe Request) message on each channel appointed when carrying out the neighbor AP detection; Other AP that receive the probe requests thereby message can reply probe response (Probe Response) message, and AP can learn the relevant information whether other AP and the AP that detects are arranged in its wireless signal overlay area like this.In addition, AP can also be by directly monitoring the information that Beacon (beacon) message is known neighbor AP.
Detect the active scan process of neighbor AP and periodically carries out usually, be uncertain neighbor AP detection time of each AP, because of the quantity of neighbor AP with need the channel quantity that scan different.When the channel quantity of needs scanning for a long time, the required time is longer; Scanning the required time of each channel increases with the quantity of neighbor AP on this channel.Like this, when the quantity of the channel of the designated scanning a greater number of AP or its neighbor AP is many, the neighbor AP detection can take the more time of AP, increased the message transmissions time delay of this AP, be difficult to satisfy some and run on the upper layer application that has the transmission time to require on the WLAN, as requirements of application in real time such as VoIP (Voice over Internet Protocol, ip voice).
Summary of the invention
Thereby the present invention will solve is that neighbor AP detects the problem that the user's access service that influences AP for a long time and provided may be provided in the prior art.
The method that detects neighboring access point AP among the WLAN of the present invention may further comprise the steps:
After receiving scan instruction, carry out neighbor AP scanning on AP each channel in channel list to be detected, the scan channel in tabulation finishes or reaches the maximum scan time limit;
AP returns the scanning result of institute's scanning channel.
Preferably, comprise the channel list to be detected of this scanning in the described scan instruction, comprising all invisible scanning channels or the uncompleted channel to be detected of last scan of AP.
Alternatively, described method also comprises: AP upgrades channel list to be detected, when scan channel finishes in former tabulation it is updated to all invisible scanning channels, otherwise it is updated in the former tabulation as yet the not channel of scanning.
Preferably, described method also comprises: set up the communication port that AP receives scan instruction and returns scanning result, receive the maximum scan time limit from this passage.
Another kind of integral WLAN test neighbor AP method provided by the invention may further comprise the steps:
Send the neighbor AP scan instruction to AP;
Receive the scanning result of this AP institute's scanning channel in its maximum scan time limit;
Upgrade the neighbor AP information of this AP on institute's scanning channel according to scanning result.
Preferably, comprise channel list to be detected in the described scan instruction, be used for indicating the channel of this scanning to AP;
Described method also comprises: upgrade the channel list to be detected of this AP according to scanning result, when scan channel finishes in former tabulation it is updated to all invisible scanning channels of this AP, otherwise it is updated in the former tabulation as yet the not channel of scanning.
Preferably, described method also comprises: set up with connection AP between communication port, by the maximum scan time limit of this path setting AP.
Preferably, each AP that is connected with polling mode instruction in each sense cycle carries out neighbor AP and detects, and the maximum scan time limit sum that institute connects AP is no more than the setting detection time limit of sense cycle.
The invention discloses a kind of wireless local area switch WLS of integral WLAN, comprise scan instruction unit, receiving element and AP information unit as a result, wherein:
The scan instruction unit is used for sending the neighbor AP scan instruction to the AP that is connected;
Receiving element is used for receiving the scanning result of AP institute's scanning channel in the maximum scan time limit as a result;
The AP information unit be used for safeguarding connect the information of AP, comprise according to scanning result and upgrade the neighbor AP information of this AP on institute's scanning channel.
Preferably, comprise channel list to be detected in the described scan instruction, be used for notifying the channel of this scanning of AP;
Described WLS also comprises Channel Elements to be detected, be used for safeguarding connect the channel list to be detected of AP; When scan channel finishes in the former tabulation it is updated to all the invisible scanning channels of this AP in the AP information unit, otherwise it is updated to the channel that does not scan as yet in the former tabulation.
Preferably, the described information that connects AP also comprise connect maximum scan time limit of AP;
Described WLS comprises that also scanning is provided with the unit in the time limit, is used for sending to the AP that is connected maximum scan time limit of this AP.
Preferably, describedly send scan instruction to AP and be specially: in each sense cycle, send scan instruction to the AP that each was connected with polling mode;
Described receiving element as a result connects the scan instruction unit, and notice scan instruction unit sent scan instruction to next AP when receiving element received the scanning result of AP as a result, and last AP finishes scanning in this sense cycle.
The invention also discloses a kind of AP of integral WLAN, comprise that command reception unit, scanning element and result return the unit, wherein:
The command reception unit is used for receiving scan instruction and starts scanning element and carries out neighbor AP scanning;
Scanning element was used for scanning neighbor AP on the channel in channel list to be detected in the maximum scan time limit;
The result returns the unit and is used for returning channel and the scanning result that is scanned.
Preferably, comprise the channel list to be detected of this scanning in the described scan instruction, comprising all invisible scanning channels or the uncompleted channel to be detected of last scan of AP;
Described channel list to be detected exports scanning element to by the command reception unit when starting scanning.
Alternatively, described AP also comprises channel maintenance unit to be detected, be used for channel list to be detected being provided and upgrading channel list to be detected according to the channel that scanning element scanned to scanning element, when scan channel finishes in former tabulation it is updated to all invisible scanning channels, otherwise it is updated in the former tabulation as yet the not channel of scanning.
Preferably, described AP also comprises scanning time limit unit, is used for receiving the maximum scan time limit and exports scanning element to.
The present invention is by setting the maximum scan time limit for each AP, AP is carried out neighbor AP detect required time restriction in this maximum scan time limit, avoided because of neighbor AP quantity and the more transmission that postpones user's message of scanning channel quantity, user's access service of the AP that guarantees has improved the service quality of WLAN;
Simultaneously, when reaching maximum scan, prescribe a time limit among the present invention, this uncompleted channel is scanned in next sense cycle, kept the neighbor AP information integrity.
Description of drawings
Fig. 1 is the networking structure exemplary plot of integral WLAN;
Fig. 2 is the flow chart of WLS side among the neighbor AP detection method embodiment one of the present invention;
Fig. 3 is the flow chart of AP side among the neighbor AP detection method embodiment one of the present invention;
Fig. 4 is the flow chart of WLS side among the neighbor AP detection method embodiment two of the present invention;
Fig. 5 is the flow chart of AP side among the neighbor AP detection method embodiment two of the present invention;
Fig. 6 by in the WLS sense cycle exemplary plot sweep time of connection AP;
Fig. 7 is the structural representation of the WLS of application the method for the invention;
Fig. 8 is the structural representation of the AP of application the method for the invention.
Embodiment
In integral WLAN, neighbor AP detects usually carries out with the sense cycle of setting, and the AP that each sense cycle is connected by the WLS dispatching office carries out neighbor AP scanning in turn on channel appointed.For long message forwarding to the user sweep time of limiting AP exerts an influence, among the present invention, AP was limited in the maximum scan time limit in the sweep time of each sense cycle, the channel of failing to finish in this time limit is scanned in next cycle.The maximum scan time limit that connects the AP of same WLS can be identical, also can be different.The maximum scan time limit of AP can be provided with on WLS by the user, also can directly be provided with on AP, and WLS is provided with the centralized management that is beneficial to AP.
The user can be by WLS or is directly specified certain AP need carry out the channel set of neighbor AP scanning on AP.After setting the maximum scan time limit, the channel that certain sense cycle AP is scanned may be the channel that the last cycle had little time to finish scanning, therefore can carry out neighbor AP scanning on the channel of each sense cycle AP in this tabulation for AP safeguards a channel list to be detected.Channel list to be detected can be safeguarded by WLS, notice AP when each cycle starts AP scanning; Also can be by AP in local maintenance.Main body difference according to safeguarding channel list to be detected the invention provides two embodiment and describes respectively.
In neighbor AP detection method embodiment one of the present invention, WLS safeguards channel list to be detected for the AP that it connected.This embodiment is the preferred embodiments of the present invention, at the testing process of WLS side as shown in Figure 2.
At step S210, connected each AP of WLS sets up communication port (Tunnel).WLS comprises the scanning result that sends scan instruction and reception AP to AP by this passage and the mutual various control informations of AP.In limited time, WLS can be provided with the maximum scan time limit to AP when setting up communication port when the user is provided with the maximum scan of AP by WLS, and after this can prescribe a time limit when needs change the maximum scan of certain AP is provided with the new maximum scan time limit by this passage to it.
At step S220, the neighbor AP sense cycle on the WLS arrives.
At step S230, determine the next AP and the channel list to be detected thereof that will detect in this sense cycle.On WLS, safeguarding the information of connected each AP.According to the information of these AP, WLS indicates connected AP to carry out neighbor AP scanning in sense cycle one by one.
At step S240, determined AP sends scan instruction in step S230, and the channel list to be detected of carrying this AP in instruction is indicated and carried out neighbor AP scanning on the channel of this AP in channel list to be detected.
At step S250, receive the scanning result of this AP, comprising the BSS sign of this AP, channel and the scanning result on these channels that is scanned.After scan instruction was received by AP, AP carried out neighbor AP scanning to the channel in the channel list to be detected in the maximum scan time limit.If the channel in the maximum scan time limit in all channel list to be detected all is scanned finish, then return the scanning result of all channels; If fail all channels of been scanned, then return the scanning result of the channel of finishing scanning.
At step S260, WLS upgrades the relevant information of this AP according to the scanning result that receives.In this AP information of safeguarding on WLS, upgrade neighbor AP information on the channel that this AP scanned according to scanning result in this sense cycle, WLS only upgrades the neighbor AP information on the pairing channel of the scanning result that returns; If the scanning result that this AP returns has comprised all channels in the channel list to be detected of this AP, then channel list to be detected is updated to all invisible scanning channels of this AP, otherwise channel list to be detected is updated to this scans uncompleted channel, scan for the next sense cycle of this AP.
At step S270, judge whether all AP that are connected with WLS have detected in this sense cycle to finish, if execution in step S280 finishes this sense cycle; If not, change step S230, the neighbor AP that begins next AP detects.
In the present embodiment, each AP can carry out neighbor AP scanning according to flow process shown in Figure 3 in each sense cycle.At step S310, receive the neighbor AP scan instruction that WLS sends, in instruction, comprise channel list to be detected.In the channel list to be detected or all invisible scanning channels of this AP, or a last sense cycle is not finished the channel to be detected of scanning.
At step S320, when starting the maximum scan quantum clock.The maximum scan time limit can directly be provided with on AP by the user; Also can concentrate to be arranged on the WLS, by WLS by and each AP between the communication port set up be provided with respectively to each AP, and when the maximum scan time limit of certain AP changes, upgraded in the same way.Can carry out at any time being provided with of AP maximum scan time limit.
At step S330, AP determines to be about to the channel of scanning according to channel list to be detected.
At step S340, in step S330, carry out neighbor AP scanning on the determined channel.
At step S350, judge whether that maximum scan time limit timing time arrives, if change step S380; If not, execution in step S360.
At step S360, when to the been scanned of this channel, write down the scanning result of this channel.
At step S370, judge whether that scan channels all in the channel list to be detected finishes, if, execution in step S380; If not, change step S330, begin next one channel to be detected is scanned.
At step S380, AP returns channel that this sense cycle scans and the scanning result on these channels.
In some specific implementations, the timing time in maximum scan time limit then can produce soft interruption or hard the interruption.In this case, in fact step S350 is carrying out in whole scanning process, and timing time in change step S380 over to, with the channel of been scanned and scanning result were back to WLS at that time.
In neighbor AP detection method embodiment two of the present invention, each AP is in the channel list to be detected of local maintenance oneself, and WLS starts AP and carries out scan channel in sense cycle.For purpose of brevity, among the embodiment two with embodiment one in identical content no longer describe in detail.
Among the embodiment two at the testing process of WLS side as shown in Figure 4.At step S410, set up the communication port of WLS and connection AP.This communication port can be used for transmitting the maximum scan time limit of scan instruction, scanning result and/or AP.
At step S420, the neighbor AP sense cycle on the WLS arrives.
At step S430, determine the next AP that will detect in this sense cycle.
At step S440, determined AP sends scan instruction in step S430.
At step S450, receive the scanning result of this AP, comprising the BSS sign of this AP, channel and the scanning result on these channels that is scanned.After scan instruction was received by AP, AP was according to the current channel list to be detected in this locality, wherein channel carried out neighbor AP scanning, and return channel and the scanning result thereof of finishing scanning in the maximum scan time limit.
At step S460, WLS upgrades the relevant information of this AP according to the scanning result that receives.The neighbor AP information that may comprise this AP invisible scanning channel in this AP information of on WLS, safeguarding, but the scanning result that this AP returned may include only local channel wherein.WLS only upgrades the neighbor AP information on the pairing channel of the scanning result that returns.
At step S470, judge whether all AP that are connected with WLS have detected in this sense cycle to finish, if execution in step S480 finishes this sense cycle; If not, change step S430, the neighbor AP that begins next AP detects.
In the present embodiment, each AP can carry out neighbor AP scanning according to flow process shown in Figure 5 in each sense cycle.At step S510, receive the neighbor AP scan instruction that WLS sends.
At step S520, when AP starts the maximum scan quantum clock.
At step S530, AP reads current channel list to be detected in this locality, determines to be about to the channel of scanning in the channel of channel list to be detected.
At step S540, in step S530, carry out neighbor AP scanning on the determined channel.
At step S550, judge whether that maximum scan time limit timing time arrives, if change step S580; If not, execution in step S560.
At step S560, when to the been scanned of this channel, write down the scanning result of this channel.
At step S570, judge whether that scan channels all in the channel list to be detected finishes, if, execution in step S580; If not, change step S530, begin next one channel to be detected is scanned.
At step S580, AP returns channel that this sense cycle scans and the scanning result on these channels.
At step S590, AP upgrades local channel list to be detected.If the channel in all channel list to be detected all in this sense cycle been scanned, then is updated to channel list to be detected all invisible scanning channels of this AP; Otherwise channel list to be detected is updated to the channel of not finishing scanning in the former tabulation in this sense cycle as yet.
When interrupt mode is adopted in the timing in maximum scan time limit, step S550 is carrying out in whole scanning process, and execution in step S580 and step S590 when timing time arrives, with at that time the channel of been scanned and scanning result be back to WLS, and upgrade local channel list to be detected.
In above-mentioned two embodiment, can be on WLS, sense cycle detects the time limit for being provided with, and all AP of WLS are used for the time sum that neighbor AP detects and are no more than this detection time limit in each sense cycle.As seen, this detection time limit should be not less than the maximum scan time limit sum of all AP.Among the present invention, maximum scan time limit and detection time limit can be by the user according to concrete applicable cases, and the recommendation value in maximum scan time limit is 50 milliseconds, and the recommendation value that detects the time limit is 30,000 milliseconds.Because being maintained in of channel list to be detected finished the load that can alleviate AP on the WLS, the present invention recommends to adopt the method among the embodiment one to carry out neighbor AP and detects.
Be example still with network configuration shown in Figure 1, if AP1, AP2 have the identical maximum scan time limit with AP3, see also Fig. 6, in the sense cycle, WLS detected in the time limit, carry out neighbor AP scanning with polling mode instruction AP1, AP2 and AP3, be less than or equal to the maximum scan time limit sweep time of AP1, AP2 and AP3.
Use structure that the WLS of the method for the invention embodiment one may have as shown in Figure 7, Channel Elements 720 to be detected connects scan instruction unit 710, AP information unit 740 and receiving element 730 as a result respectively; AP information unit 740 connects as a result respectively, and receiving element 730 is provided with unit 750 with the scanning time limit; Scan instruction unit 710 connects receiving element 730 as a result.
WLS with the information stores of the AP that it connected in AP information unit 740, comprising the neighbor AP information of each AP on its all invisible scanning channels, simultaneously AP information unit 740 be responsible for according to and AP between the control message upgrade the AP information of its storage.
Receiving element 730 is responsible for receiving the scanning result that AP returns as a result, comprising the scanning result on the channel of finishing scanning in the maximum scan time limit of this AP and this channel.Receiving element exports scanning result to Channel Elements 720 to be detected and AP information unit 740 as a result.AP information unit 740 finds the neighbor AP information of this AP in the AP of its storage information, upgrade the pairing neighbor AP information of channel that this AP finishes scanning according to scanning result.Channel Elements 720 to be detected is checked all channels that whether comprise in the scanning result in this AP channel list to be detected, if, then from AP information unit 740, read all invisible scanning channels of this AP, the channel list to be detected of this AP is updated to its all invisible scanning channels; If not, then the channel list to be detected of this AP is updated to this and scans uncompleted channel.
When receiving element 730 as a result receives the scanning result that AP returns, can notify 710 beginnings of scan instruction unit to send scan instruction to next AP, last AP finishes scanning in this sense cycle.
If the maximum scan time limit of AP is provided with by WLS, WLS can also increase scanning and the time limit unit 750 is set, and the scanning time limit is provided with the maximum scan time limit that unit 750 reads each AP in the AP information unit 740, sends it to corresponding AP.
To using the WLS of the method for the invention embodiment two, only need cancellation Channel Elements 720 to be detected in the structure of above-mentioned WLS; Make scan instruction unit 710 directly connect AP information unit 740, from AP information unit 740, learn which AP to send scan instruction to; Mutual getting final product between other each unit cancellations and the Channel Elements to be detected 720.No longer repeat specification herein.
Use AP a kind of of the method for the invention embodiment two may structure as shown in Figure 8, scanning element 830 is connected to command reception unit 810, channel maintenance unit 820 to be detected, result respectively and returns unit 840 and scanning time limit unit 850.
AP is safeguarding channel list to be detected in the channel maintenance unit 820 to be detected of this locality, wherein depositing the channel set that will scan in the next sense cycle, and upgrades according to the neighbor AP scanning result in each cycle.Receive the scan instruction of WLS when command reception unit 810 after, the scan channel of beacon scanning unit 830 these sense cycle of beginning.When scanning element 830 starts the maximum scan quantum clock, read channel list to be detected, to preceding channel in the tabulation is carried out neighbor AP scanning in timing from channel maintenance unit 820 to be detected, and the writing scan result.
When arriving when the maximum scan quantum clock, scanning element 830 exports scanning result to channel maintenance unit 820 to be detected and the result returns unit 840.Whether the channel of channel maintenance unit 820 to be detected in checking tabulation been scanned, if been scanned then be all invisible scanning channels of this AP with list update; Otherwise list update is not finished the channel of scanning as yet for this.The result returns unit 840 channel of scanning element 830 been scanned and the scanning result of these channels is returned to WLS.
If the maximum scan time limit of AP is provided with by WLS, AP can also comprise scanning time limit unit 850, receives WLS and exports scanning element 830 to the maximum scan time limit of this AP transmission and with it.
To using the WLS of the method for the invention embodiment two, the to be detected channel maintenance unit 820 of cancellation in the structure of above-mentioned AP, owing to comprise the channel list to be detected of this AP in the scan instruction of command reception unit 810 receptions this moment, command reception unit 810 can export channel list to be detected to scanning element and get final product when startup scanning element 830 scan simultaneously.All the invisible scanning channels or the uncompleted channel to be detected of last scan that comprise this AP in the channel list to be detected in the scan instruction.
Need to prove that among the present invention, the detected neighbor AP of AP that WLS connects comprises the AP that belongs to this WLS management, also may comprise the AP that does not belong to this WLS management, WLS can carry out Radio Frequency Management with reference to these relevant informations that do not belong to the neighbor AP of its management.
To sum up, no matter the neighbor AP quantity of the channel quantity of the required scanning of AP and this AP has what, also the present invention can guarantee that the time of each AP scanning neighbor AP is no more than the maximum scan time limit that the user sets, and has nothing to do with the neighbor AP quantity of this AP.After the user is provided with the appropriate maximum scan time limit and detects the time limit, can guarantee that AP when collecting neighbor AP information, can provide normal wireless access service, satisfy the quality of service requirement of various real-time application.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (16)
1. detect the method for neighboring access point AP among the Centralized Wireless LAN WLAN, it is characterized in that, may further comprise the steps:
After receiving scan instruction, carry out neighbor AP scanning on AP each channel in channel list to be detected, the scan channel in tabulation finishes or reaches the maximum scan time limit;
AP returns the scanning result of institute's scanning channel.
2. integral WLAN test neighbor AP method according to claim 1 is characterized in that: comprise the channel list to be detected of this scanning in the described scan instruction, comprising all invisible scanning channels or the uncompleted channel to be detected of last scan of AP.
3. integral WLAN test neighbor AP method according to claim 1, it is characterized in that, described method also comprises: AP upgrades channel list to be detected, when scan channel finishes in former tabulation it is updated to all invisible scanning channels, otherwise it is updated in the former tabulation as yet the not channel of scanning.
4. as integral WLAN test neighbor AP method as described in claim 2 or 3, it is characterized in that described method also comprises: set up the communication port that AP receives scan instruction and returns scanning result, receive maximum scan time limit from this passage.
5. an integral WLAN test neighbor AP method is characterized in that, may further comprise the steps:
Send the neighbor AP scan instruction to AP;
Receive the scanning result of this AP institute's scanning channel in its maximum scan time limit;
Upgrade the neighbor AP information of this AP on institute's scanning channel according to scanning result.
6. as integral WLAN test neighbor AP method as described in the claim 5, it is characterized in that: comprise channel list to be detected in the described scan instruction, be used for indicating the channel of this scanning to AP;
Described method also comprises: upgrade the channel list to be detected of this AP according to scanning result, when scan channel finishes in former tabulation it is updated to all invisible scanning channels of this AP, otherwise it is updated in the former tabulation as yet the not channel of scanning.
7. as integral WLAN test neighbor AP method as described in claim 5 or 6, it is characterized in that described method also comprises: set up with connection AP between communication port, by the maximum scan time limit of this path setting AP.
8. as integral WLAN test neighbor AP method as described in the claim 5, it is characterized in that, described method also comprises: each AP that is connected with polling mode instruction in each sense cycle carries out neighbor AP and detects, and the maximum scan time limit sum that institute connects AP is no more than the setting detection time limit of sense cycle.
9. the wireless local area switch WLS of an integral WLAN is characterized in that, comprises scan instruction unit, receiving element and AP information unit as a result, wherein:
The scan instruction unit is used for sending the neighbor AP scan instruction to the AP that is connected;
Receiving element is used for receiving the scanning result of AP institute's scanning channel in the maximum scan time limit as a result;
The AP information unit be used for safeguarding connect the information of AP, comprise according to scanning result and upgrade the neighbor AP information of this AP on institute's scanning channel.
10. as the WLS of integral WLAN as described in the claim 9, it is characterized in that: comprise channel list to be detected in the described scan instruction, be used for notifying the channel of this scanning of AP;
Described WLS also comprises Channel Elements to be detected, be used for safeguarding connect the channel list to be detected of AP; When scan channel finishes in the former tabulation it is updated to all the invisible scanning channels of this AP in the AP information unit, otherwise it is updated to the channel that does not scan as yet in the former tabulation.
11. the WLS as integral WLAN as described in claim 9 or 10 is characterized in that: the described information that connects AP also comprise connect maximum scan time limit of AP;
Described WLS comprises that also scanning is provided with the unit in the time limit, is used for sending to the AP that is connected maximum scan time limit of this AP.
12. the WLS as integral WLAN as described in the claim 9 is characterized in that, describedly sends scan instruction to AP and is specially: send scan instruction with polling mode to the AP that each was connected in each sense cycle;
Described receiving element as a result connects the scan instruction unit, and notice scan instruction unit sent scan instruction to next AP when receiving element received the scanning result of AP as a result, and last AP finishes scanning in this sense cycle.
13. the AP of an integral WLAN is characterized in that, comprises that command reception unit, scanning element and result return the unit, wherein:
The command reception unit is used for receiving scan instruction and starts scanning element and carries out neighbor AP scanning;
Scanning element was used for scanning neighbor AP on the channel in channel list to be detected in the maximum scan time limit;
The result returns the unit and is used for returning channel and the scanning result that is scanned.
14. the AP as integral WLAN as described in the claim 13 is characterized in that: comprise the channel list to be detected of this scanning in the described scan instruction, comprising all invisible scanning channels or the uncompleted channel to be detected of last scan of AP;
Described channel list to be detected exports scanning element to by the command reception unit when starting scanning.
15. AP as integral WLAN as described in the claim 13, it is characterized in that: described AP also comprises channel maintenance unit to be detected, be used for channel list to be detected being provided and upgrading channel list to be detected according to the channel that scanning element scanned to scanning element, when scan channel finishes in former tabulation it is updated to all invisible scanning channels, otherwise it is updated in the former tabulation as yet the not channel of scanning.
16. as the AP of integral WLAN as described in any one of the claim 13 to 15, it is characterized in that: described AP also comprises scanning time limit unit, is used for receiving the maximum scan time limit and exports scanning element to.
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| CN102404826A (en) * | 2011-12-13 | 2012-04-04 | 杭州华三通信技术有限公司 | Channel scanning method and equipment |
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| WO2014047890A1 (en) * | 2012-09-28 | 2014-04-03 | 华为技术有限公司 | Wireless local area network access method, base station controller and user equipment |
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