CN101635959B - Method and device for realizing load balance - Google Patents
Method and device for realizing load balance Download PDFInfo
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- CN101635959B CN101635959B CN2009101693181A CN200910169318A CN101635959B CN 101635959 B CN101635959 B CN 101635959B CN 2009101693181 A CN2009101693181 A CN 2009101693181A CN 200910169318 A CN200910169318 A CN 200910169318A CN 101635959 B CN101635959 B CN 101635959B
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Abstract
The invention discloses a method for realizing load balance, which is applied to a wireless local area network comprising a wireless controller, a wireless access point (AP) and a wireless client (STA). The method comprises the following steps: scanning the AP in the wireless local area network regularly by the wireless controller to acquire the load information of the AP, and judging whether a load between a first radio frequency and a second radio frequency on the AP is balanced or not according to the load information; if the load between the first radio frequency and the second radio frequency on the AP is not balanced, examining whether the STA associated with the AP supports various radio frequency types or not by the wireless controller, and if so, adjusting the SAT which supports various radio frequency types to switch the radio frequency types. The invention improves the throughput of the whole network.
Description
Technical field
The present invention relates to Internet technical field, relate in particular to a kind of method and apparatus of realizing load balancing.
Background technology
As present IT (Information Technology; Information technology) one of hot technology of industry; WLAN (Wireless Local Access Network, WLAN) provides a kind of wireless connections service of local area network (LAN), and wireless data access at a high speed can be provided; Be widely used in the network coverage of city and public place, and various places such as enterprise, building and family.
In WLAN office network and focus overlay network; Part A P (Access Point, WAP) or whole AP can provide two kinds of radio service: 11a and 11g simultaneously, and the wireless client differentiation clearly; The only support 11g that has, what have can support 11a and 11g simultaneously.
At present, how IEEE 802.11 standards are to not realizing in Dual Band network that the load balancing between 11a and the 11g does any regulation.For double frequency STA (Station, wireless client), can scan two frequency ranges of 5GHz and 2.4GHz simultaneously, if can both find AP in these two frequency ranges, then insert the strongest AP of signal; Also can select a frequency range at random, and select the AP of the peak signal in this frequency range to insert.
In the prior art, the load balancing between 11a and the 11g inserts by STA fully and realizes.And STA realizes that the algorithm of load balancing is inconsistent in each manufacturer, can cause the unbalanced situation of appearance load between 11a and the 11g.In addition, the equilibrium between 11a and the 11g lacks dynamic process, for example, 11a and 11g reach equilibrium state in a Dual Band network after, has inserted the wireless client of several single-frequency again, still can cause the load imbalance between 11a and the 11g.
Summary of the invention
The invention provides a kind of method and apparatus of realizing load balancing, be used for realizing the dynamic load leveling between Dual Band network 11a and the 11g.
The invention provides a kind of method that realizes load balancing, be applied to comprise in the WLAN of wireless controller, wireless access point AP and wireless client STA, said method comprising the steps of:
AP in the said wireless controller periodic scanning WLAN obtains the load information of said AP, judges according to said load information whether first radio frequency and the load between second radio frequency on the said AP be balanced;
If the load between said first radio frequency and said second radio frequency is unbalanced; Whether the said wireless controller inspection STA related with said AP supports multiple radio type; If support that the STA that then adjusts the multiple radio type of said support carries out the switching of radio type.
Preferably, said wireless controller adjustment supports the STA of multiple radio type to carry out the switching of radio type, specifically comprises:
Said wireless controller sends to said STA with the BSSID BSSID tabulation that said STA should switch through the AP related with said STA, notifies said STA to carry out the switching of radio type.
Preferably, said wireless controller judges that according to load information first radio frequency and the load between second radio frequency on the AP whether after the equilibrium, also comprises:
Said wireless controller judges according to the load information of said AP whether first rf load and/or second rf load between the different AP be balanced,, adjusts the STA related with said AP and carries out the switching between the AP for not the time in judged result.
Preferably, the said wireless controller adjustment STA related with AP carries out the switching between the AP, specifically comprises:
Said wireless controller sends to said STA with the BSSID tabulation that said STA should switch through the AP related with said STA, notifies said STA to carry out the switching between the AP.
The present invention also provides a kind of wireless controller, is applied to comprise that said wireless controller comprises in the WLAN of wireless controller, AP and STA:
Scan module is used for the AP of periodic scanning WLAN, obtains the load information of said AP;
Judge module is connected with said scan module, is used for judging according to the said load information that said scan module obtains whether first radio frequency and the load between second radio frequency on the said AP be balanced;
Adjusting module; Be used for when said judge module judges that load between said first radio frequency and said second radio frequency is unbalanced; Check whether the STA related with said AP supports multiple radio type; When the STA related with said AP supported multiple radio type, the STA that adjusts the multiple radio type of said support carried out the switching of radio type.
Preferably, said adjusting module, the BSSID BSSID that specifically is used for said STA should be switched tabulates, and sends to said STA through the AP related with said STA, notifies said STA to carry out the switching of radio type.
Preferably, said judge module also is used for judging according to the load information of said AP whether first rf load and/or second rf load between the different AP be balanced;
Said adjusting module also is used for when said judge module judges that first rf load and/or second rf load between the different AP is unbalanced, adjusting the STA related with said AP and carrying out the switching between the AP.
Preferably, said adjusting module, the BSSID that specifically is used for said STA should be switched tabulates, and sends to said STA through the AP related with said STA, notifies said STA to carry out the switching between the AP.
The present invention also provides a kind of method that realizes load balancing, is applied to comprise in the WLAN of wireless controller, AP and STA, said method comprising the steps of:
Said AP receives the BSSID tabulation from said wireless controller, and said BSSID tabulation is sent to the STA related with self, makes said STA carry out the switching of radio type and/or the switching between the AP;
Said AP receives the switching result from said STA.
Preferably, described method also comprises:
The said AP detecting STA related with self, and, make said wireless controller adjust the switch instances of said STA according to said STA information with the said said wireless controller of STA information reporting that detects.
Preferably, described method also comprises:
Said AP is to said STA issue bandwidth relevant information and neighbor AP channel information; , make said STA carry out the AP access according to said bandwidth relevant information and said neighbor AP channel information.
The present invention also provides a kind of AP, is applied to comprise that said AP comprises in the WLAN of wireless controller, AP and STA:
Receiver module is used to receive from the BSSID tabulation of said wireless controller with from the switching result of said STA;
Sending module is connected with said receiver module, is used for the said BSSID tabulation that said receiver module receives is sent to the STA related with self, makes said STA carry out the switching of radio type and/or the switching between the AP.
Preferably, said sending module also is used to detect the STA related with self, and with the said said wireless controller of STA information reporting that detects, makes said wireless controller adjust the switch instances of said STA according to said STA information.
Preferably, said sending module also is used for to STA issue bandwidth relevant information and neighbor AP channel information, makes said STA carry out the AP access according to said bandwidth relevant information and said neighbor AP channel information.
Compared with prior art; The present invention has the following advantages: the present invention is through reciprocal process between wireless controller, AP and the STA; Realize the dynamic equalization of load, the 11a load between all AP and the 11g load between all AP between the different radio frequency type in the Dual Band network, promoted the throughput of whole network.
Description of drawings
Fig. 1 is a kind of method flow diagram of realizing load balancing among the present invention;
Fig. 2 realizes the method flow diagram of load balancing for the another kind among the present invention;
Fig. 3 is the realization SiteServer LBS structural representation of application scenarios of the present invention;
Fig. 4 is the flow chart of the realization load balancing of application scenarios of the present invention;
Fig. 5 is the wireless controller structural representation among the present invention;
Fig. 6 is the AP structural representation among the present invention.
Embodiment
In the technical scheme provided by the invention, when its core concept was the STA access network, the bandwidth information of utilizing AP to provide selected the AP of optimum performance to insert; Behind the STA access network, AP initiatively detects STA and whether supports double frequency and will detect the result to report wireless controller; Wireless controller is made regular check on the equilibrium situation that each AP goes up load, the 11a load between all AP and the 11g load between all AP between 11a and the 11g; And according to the model of load balancing needs and wireless client, notice STA carries out the switching of radio type and the switching between AP.Wireless controller among the present invention can according to the load balancing of network environment raising 11a and 11g, promote the handling up property of whole network when the differentiation wireless client inserts Dual Band network.
To combine the accompanying drawing among the present invention below; Technical scheme of the present invention is carried out clear, intactly description, as shown in Figure 1, be a kind of method flow diagram of realizing load balancing among the present invention; Be applied to comprise that this method may further comprise the steps in the WLAN of wireless controller, AP and STA:
Wherein, the load information of AP comprises related STA quantity, channel utilization, can obtain access ability and the average access delay of BSS.When the wireless controller adjustment supports that the STA of multiple radio type carries out the switching of radio type,, notify the AP related with this STA with BSSID (Basic Service Set Identifier, the BSSID) tabulation that STA should switch; This AP sends the BSSID tabulation to STA; This STA tabulates according to BSSID and carries out the switching of radio type, and reports AP with switching result.Comprise at least one BSSID in the above-mentioned BSSID tabulation.
Wherein, first radio frequency and second radio frequency can be respectively 11a and 11g, can be respectively 11an and 11gn also, can also be other two kinds of different radio frequency types.
Particularly, wireless controller sends to STA with the BSSID tabulation that STA should switch through the AP related with this STA, notifies this STA to carry out the switching of radio type.
Behind first radio frequency and the load balancing between second radio frequency confirmed on the same AP; Wireless controller can also judge whether first rf load and/or second rf load between the different AP be balanced according to the load information of AP;, adjust the STA related and carry out the switching between the AP for not the time in judged result with AP.Particularly, wireless controller sends to STA with the BSSID tabulation that STA should switch through the AP related with this STA, notifies this STA to carry out the switching between the AP.
As shown in Figure 2, the method flow diagram for the realization of the another kind among the present invention load balancing is applied to comprise that this method may further comprise the steps in the WLAN of wireless controller, AP and STA:
As shown in Figure 3, the realization SiteServer LBS structural representation for application scenarios of the present invention comprises wireless controller 310, AP 320 and STA 330, wherein,
Particularly, the BSSID tabulation that wireless controller 310 should switch STA 330, the AP 320 that notice and STA 330 are related; AP 320 sends the BSSID tabulation to STA 330; STA 330 tabulates according to BSSID and carries out the switching between the AP, and reports AP 320 with switching result.
AP 320, are used to detect the STA related with self 330, and with the STA information reporting wireless controller 310 that detects.
Particularly, AP 320 is to STA 330 issue bandwidth relevant information and neighbor AP channel informations.
Below in conjunction with concrete application scenarios, the method for the realization load balancing among the present invention is carried out detailed, concrete description, as shown in Figure 4, the flow chart for the realization load balancing of application scenarios of the present invention specifically may further comprise the steps:
Wherein, can carry the bandwidth relevant information in Beacon frame or the Probe Response frame, comprise related STA quantity, channel utilization, can obtain information such as access ability and the average access delay of BSS; Can also carry the neighbor AP channel information; The current AP of the Beacon frame of this neighbor AP and transmission or Probe Response frame has identical SSID; Can have the same radio frequency type, also can have the different radio frequency type, even comprise the different radio frequency on the same AP.
Particularly; When STA supported 802.11v, AP directly inquired about to STA behind the STA access network; Be AP with after STA is related; Send Diagnostic Request frame to STA, this DiagnosticRequest frame comprises Diagnostic Request element and Diagnostic InformationSubelements, wherein; Type among the Diagnostic Request element is Vendor Specific, and Diagnostic Information Subelements requires the STA report whether to support other radio types (11g, 11a etc.); After STA receives the Diagnostic Request frame from AP; Return the DiagnosticReport frame to AP, this Diagnostic Report frame comprises Diagnostic Report element and DiagnosticInformation Subelements, wherein; Type among the Diagnostic Report element is VendorSpecific; Other radio types that Diagnostic Information Subelements report STA supports if do not support other radio types, then are empty; AP will with self be associated with STA information reporting wireless controller; This STA information comprises that AP label, each radio-frequency information (comprise radio frequency label, radio type; And bandwidth information, promptly channel utilization, can obtain access ability, the average access delay of BSS etc.), the down related STA quantity of each radio frequency, the radio type that STA can support etc.When STA information changed, AP in time upgraded STA information to wireless controller.Through sending the DiagnosticRequest frame to STA, AP can obtain more comprehensively STA information; Particularly, AP can just send Diagnostic Request frame after STA inserts, and need not therefore, can obtain STA information more quickly to the monitoring from the Probe Request frame of STA.
When STA does not support 802.11v; Support the AP of dijection frequency type to intercept the Probe Request frame that all STA send in the network; And a timer is set, when before timer is aging, receiving the Probe Request frame that certain STA sends, and according to the MAC Address in the Probe Request frame judge this ProbeRequest frame by this STA when different radio frequency sends; Judge that this STA supports multiple radio type, the MAC Address of this STA, the radio type of support are reported to wireless controller; AP will be associated with the STA report information of self and give wireless controller; This STA information comprises that AP label, each radio-frequency information (comprise radio frequency label, radio type; And bandwidth information; Be channel utilization, can obtain access ability, the average access delay of BSS etc.), the down related STA quantity of each radio frequency, radio type that STA can support (can judge) etc. according to the radio type that STA is associated with AP, when STA information changed, AP in time upgraded STA information to wireless controller.
Whether step 406, wireless controller inspection have STA to support multiple radio type, and when being, the STA of the multiple radio type of notice support switches on another radio type in check result.
Particularly, wireless controller is notified this STA related AP with the BSSID tabulation that STA should switch; After AP receives the BSSID tabulation that STA should switch; Send BSS TransitionManagement Request frame to this STA, comprised the BSSID tabulation that to switch among the BSSCandidate List Entries in this BSS Transition Management Request frame; STA tabulates according to BSSID and switches, and related AP sends BSS Transition Management Response frame, report switching result before switching.
The present invention is through reciprocal process between wireless controller, AP and the STA, realizes the dynamic equalization of load, the 11a load between all AP and the 11g load between all AP between the 11a and 11g in the Dual Band network, promoted the throughput of whole network.
The present invention provides the methods and applications scene that realizes load balancing in the above-described embodiment, and correspondingly, the present invention also provides the device of the method for using above-mentioned realization load balancing.
As shown in Figure 5, be a kind of wireless controller structural representation among the present invention, be applied to comprise that this wireless controller comprises in the WLAN of wireless controller, AP and STA:
Wherein, the load information of AP comprises related STA quantity, channel utilization, can obtain access ability and the average access delay of BSS.
Above-mentioned judge module 520 also is used for judging according to the load information of said AP whether first rf load and/or second rf load between the different AP be balanced.
Adjusting module 530; Be used for when judge module 520 judges that load between first radio frequencies and said second radio frequency is unbalanced; Check whether the STA related with AP supports multiple radio type; When the STA related with AP supports multiple radio type, adjust this STA that supports multiple radio type and carry out the switching of radio type.
Above-mentioned adjusting module 530, the BSSID BSSID that specifically is used for said STA should be switched tabulates, and sends to said STA through the AP related with said STA, notifies said STA to carry out the switching of radio type.
Above-mentioned adjusting module 530 also is used for when judge module 520 judges that first rf load and/or second rf load between the different AP is unbalanced, adjusting the STA related with said AP and carrying out the switching between the AP.
Above-mentioned adjusting module 530, the BSSID that specifically is used for said STA should be switched tabulates, and sends to said STA through the AP related with said STA, notifies said STA to carry out the switching between the AP.
As shown in Figure 6, be the AP structural representation among the present invention, be applied to comprise that this AP comprises in the WLAN of wireless controller, AP and STA:
Receiver module 610 is used to receive from the BSSID tabulation of wireless controller with from the switching result of STA.
Sending module 620 is connected with receiver module 610, and the BSSID tabulation that is used for receiver module 610 is received sends to the STA related with self, makes this STA carry out the switching of radio type and/or the switching between the AP.
Above-mentioned sending module 620 also is used to detect the STA related with self, and with the said said wireless controller of STA information reporting that detects, makes said wireless controller adjust the switch instances of said STA according to said STA information.
Above-mentioned sending module 620 also is used for to STA issue bandwidth relevant information and neighbor AP channel information, makes said STA carry out the AP access according to said bandwidth relevant information and said neighbor AP channel information.
The present invention realizes the dynamic equalization of load, the 11a load between all AP and the 11g load between all AP between the different radio frequency type in the Dual Band network through reciprocal process between wireless controller, AP and the STA, has promoted the throughput of whole network.
Through the description of above execution mode, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding; The part that technical scheme of the present invention contributes to prior art in essence in other words can be come out with the embodied of software product; This computer software product is stored in the storage medium, comprise some instructions with so that a station terminal equipment (can be mobile phone, personal computer; Server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be looked protection scope of the present invention.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be integrated in one, and also can separate deployment; A module can be merged into, also a plurality of submodules can be further split into.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
More than disclosedly be merely several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (8)
1. a method that realizes load balancing is applied to comprise in the WLAN of wireless controller, wireless access point AP and wireless client STA, it is characterized in that, said method comprising the steps of:
AP in the said wireless controller periodic scanning WLAN; Obtain the load information of said AP; The load information of said AP comprises related STA quantity, judges according to said load information whether first radio frequency and the load between second radio frequency on the said AP be balanced;
If the load between said first radio frequency and said second radio frequency is unbalanced; Whether the said wireless controller inspection STA related with said AP supports multiple radio type; If support that the STA that then adjusts the multiple radio type of said support carries out the switching of radio type;
When said wireless controller judges that according to load information first radio frequency and the load between second radio frequency on the AP is whether after the equilibrium; Judge according to the load information of said AP whether first rf load and/or second rf load between the different AP be balanced; In judged result for not the time; Said wireless controller sends to said STA with the BSSID tabulation that said STA should switch through the AP related with said STA, notifies said STA to carry out the switching between the AP.
2. the method for claim 1 is characterized in that, said wireless controller adjustment supports the STA of multiple radio type to carry out the switching of radio type, specifically comprises:
Said wireless controller sends to said STA with the BSSID BSSID tabulation that said STA should switch through the AP related with said STA, notifies said STA to carry out the switching of radio type.
3. a wireless controller is applied to comprise in the WLAN of wireless controller, AP and STA, and it is characterized in that, said wireless controller comprises:
Scan module is used for the AP of periodic scanning WLAN, obtains the load information of said AP, and the load information of said AP comprises related STA quantity;
Judge module is connected with said scan module, is used for judging according to the said load information that said scan module obtains whether first radio frequency and the load between second radio frequency on the said AP be balanced; Judge according to the load information of said AP whether first rf load and/or second rf load between the different AP be balanced;
Adjusting module; Be used for when said judge module judges that load between said first radio frequency and said second radio frequency is unbalanced; Check whether the STA related with said AP supports multiple radio type; When the STA related with said AP supported multiple radio type, the STA that adjusts the multiple radio type of said support carried out the switching of radio type; When first rf load between the different AP of said judge module judgement and/or second rf load are unbalanced; The BSSID that said STA should be switched tabulates; AP through related with said STA sends to said STA, notifies said STA to carry out the switching between the AP.
4. like the said wireless controller of claim 3, it is characterized in that,
Said adjusting module, the BSSID BSSID that specifically is used for said STA should be switched tabulates, and sends to said STA through the AP related with said STA, notifies said STA to carry out the switching of radio type.
5. a method that realizes load balancing is applied to comprise in the WLAN of wireless controller, AP and STA, it is characterized in that, said method comprising the steps of:
Said AP receives the BSSID tabulation from said wireless controller, and said BSSID tabulation is sent to the STA related with self, makes said STA carry out the switching of radio type and/or the switching between the AP;
Said AP receives the switching result from said STA;
The said AP detecting STA related with self, and, make said wireless controller adjust the switch instances of said STA according to said STA information with the said said wireless controller of STA information reporting that detects.
6. method as claimed in claim 5 is characterized in that, also comprises:
Said AP makes said STA carry out the AP access according to said bandwidth relevant information and said neighbor AP channel information to said STA issue bandwidth relevant information and neighbor AP channel information.
7. an AP is applied to comprise in the WLAN of wireless controller, AP and STA, and it is characterized in that, said AP comprises:
Receiver module is used to receive from the BSSID tabulation of said wireless controller with from the switching result of said STA;
Sending module is connected with said receiver module, is used for the said BSSID tabulation that said receiver module receives is sent to the STA related with self, makes said STA carry out the switching of radio type and/or the switching between the AP; Detect the STA related, and, make said wireless controller adjust the switch instances of said STA according to said STA information the said said wireless controller of STA information reporting that detects with self.
8. like the said AP of claim 7, it is characterized in that,
Said sending module also is used for to STA issue bandwidth relevant information and neighbor AP channel information, makes said STA carry out the AP access according to said bandwidth relevant information and said neighbor AP channel information.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102256337B (en) * | 2011-07-08 | 2015-04-15 | 杭州华三通信技术有限公司 | Message processing method and equipment in wireless local area network (WLAN) |
| CN102404794A (en) * | 2011-11-28 | 2012-04-04 | 福建星网锐捷网络有限公司 | Method, equipment and network for load balancing based on frequency band in wireless local area network |
| CN102932959B (en) * | 2012-10-30 | 2015-09-23 | 福建星网锐捷网络有限公司 | Intelligence divides double-frequency wireless access device and method, the network equipment |
| CN103856959B (en) * | 2012-11-30 | 2018-09-21 | 华为技术有限公司 | Wireless LAN quality control method, equipment and system |
| CN103313350B (en) * | 2013-06-24 | 2016-09-07 | 京信通信技术(广州)有限公司 | A kind of Dual Band network cut-in method, device and access point apparatus |
| CN104703221A (en) * | 2013-12-10 | 2015-06-10 | 中国移动通信集团北京有限公司 | Mobile network, device and method for control of terminal access target frequency bands |
| EP3133773B1 (en) * | 2014-05-07 | 2019-01-09 | Huawei Technologies Co., Ltd. | Method, apparatus and system for data interaction between aps in wifi system |
| CN105682142A (en) * | 2014-11-19 | 2016-06-15 | 中兴通讯股份有限公司 | Load capacity configuration method and device |
| CN105812273B (en) * | 2014-12-31 | 2019-05-17 | 华为软件技术有限公司 | Load-balancing method and device |
| CN104822168B (en) * | 2015-04-22 | 2019-02-05 | 深圳市信锐网科技术有限公司 | The bootstrap technique and device of wireless terminal frequency range switching |
| CN106937332B (en) * | 2017-04-21 | 2020-12-29 | 台州市吉吉知识产权运营有限公司 | Load balancing method and system based on wireless routing equipment mixing |
| CN107484206B (en) * | 2017-05-03 | 2020-12-18 | 北京星网锐捷网络技术有限公司 | Method and device for realizing link load balance in wireless local area network |
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