CN105025525A - Channel load balancing system and method for multi-channel wireless local area network - Google Patents
Channel load balancing system and method for multi-channel wireless local area network Download PDFInfo
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- CN105025525A CN105025525A CN201510434117.5A CN201510434117A CN105025525A CN 105025525 A CN105025525 A CN 105025525A CN 201510434117 A CN201510434117 A CN 201510434117A CN 105025525 A CN105025525 A CN 105025525A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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Abstract
The invention provides a channel load balancing system and method for a multi-channel wireless local area network. The system includes a controller connected to the wireless local area network and a plurality of access points arranged in N channels that are not in mutual interference. The access points are used for generating detection frame messages and uploading the messages to the controller when receiving detection frames sent by a terminal, wherein the detection frame messages include wireless signal header information and terminal MAC addresses. The access points are also used for sending responses of the detection frame to the terminal when receiving responding messages delivered by the controller and thereby establishing connection with the terminal. The controller is used for selecting the channels and the access points for access of the wireless local network of the terminal sending the original detection frame according to the detection frame messages uploaded by the access points. The invention also provides the corresponding channel load balancing method. According to the invention, WLAN channel load balance can be realized at a low cost. Besides, the system and method provided by the invention are accessible to terminals, so that promotion is facilitated.
Description
Technical field
The present invention relates to Network access control technical field, specifically, the present invention relates to a kind of channel loading equalizing system and method for multichannel wireless local area networks.
Background technology
WLAN (Wireless Local Area Networks, WLAN (wireless local area network)) uses radio wave to carry out the local area network (LAN) connected as data transport media.The otherness major part of WLAN (wireless local area network) and cable LAN is determined by the sharing characteristic of medium and the semiduplex operating characteristic of wireless network card.A simple WLAN is made up of two kind equipments: terminal and AP (Access Point, access point).Terminal is the equipment be connected in WLAN (wireless local area network); AP is to provide wireless stations to cable LAN with from the equipment of cable LAN to the access of wireless stations.
In large-scale organization, WLAN may have hundreds and thousands of AP, to provide services on the Internet for a large amount of users.In such a scenario, a large amount of AP works simultaneously, inevitably there will be interfering with each other between wireless device.In traditional microcellulor framework, shared channel is kept apart, namely between any two cellular zones based on shared channel, all there is a cellular zone based on non-shared channel of the two being kept apart, this makes it possible in the to a certain degree lower phenomenon reducing co-channel interference.But, on the basis ensureing network performance, the quantity of single AP access is limited, and the scale of community (i.e. cellular zone) can not infinitely reduce, the access scale and the performance that result in the WLAN of traditional microcellulor framework are all limited, be difficult to the large-scale application scenarios being applicable to densely populated place, such as large organization mechanism, large-scale meeting-place etc.
In order to the WLAN solved under densely populated place application scenarios accesses problem, in prior art, propose a kind of wireless architecture based on virtual cellular.Under this framework, have employed multi channel layering and dispose the mode combining centralized management.First, each channel is as a service plane, and each service plane provides access service by multiple AP, and terminal is scanned by the algorithm of self and selects an AP to access WLAN.Secondly, also add centralized management equipment in this framework, it is connected with each AP, and monitors the offered load of whole WLAN, and when finding load imbalance, the AP accessed by switching each terminal is optimized.This framework can improve wireless access scale in the large-scale application scenarios of densely populated place (such as enterprise-level deployment scenario), but, also there is following problem in it: first, in the large-scale application scenarios of densely populated place, the deployment of cellular zone will be very intensive, even if two with frequently being isolated with frequency cellular zone by non-between cellular zone, distance is therebetween also very limited.Now in order to reduce wireless signal conflict, the transmission rate at the covering edge of sacrificing AP signal of having to.Secondly, aforementioned based in the wireless architecture of virtual cellular, terminal active scan can find neighbouring AP, and in time finding a certain channel when active scan and have AP to respond, the two will directly connect.But terminal has succession when carrying out active scan, namely interrupt often scanning from low frequency channel, under this mechanism, often cause terminal crowded with on the channel that frequency is lower, cause the difficulty of channel loading optimization and expense to enlarge markedly.Finally, in now widely used 2.4GHz wireless environment, do not support that the channel of 802.11h specification switching statement function carrys out the channel of control terminal; And in the wireless environment of 5GHz, equipment that neither be all supports 802.11h protocol specification, the channel difficulty that this causes centralized management equipment switching terminal to use strengthens, and even cannot switch the channel of some terminal, and then cause the limited ability of load balancing.
Summary of the invention
Therefore, task of the present invention is to provide a kind of channel loading balancing solution that can overcome the multichannel wireless local area networks of upper prior art defect.
According to an aspect of the present invention, provide a kind of channel loading equalizing system of multichannel wireless local area networks, comprise at least one controller of accessing WLAN and be deployed in N number of multiple access points not interfereing with each other channel, wherein N is at least two;
Described access point is used for when receiving the explore frame that terminal sends, and generate explore frame infomational message and be uploaded to described controller, described explore frame infomational message comprises the wireless signal header information and terminal MAC address extracted in described explore frame; Described access point also for sending the response of described explore frame to described terminal when receiving the response message that described controller issues, and then connects with described terminal; Described controller is used for the explore frame infomational message uploaded according to multiple described access point, and the selected terminal sending original explore frame accesses channel and the access point of described WLAN (wireless local area network), and issues response message to selected described access point.
Wherein, described wireless signal header information comprises: channel that explore frame uses, explore frame transmitting terminal signal strength signal intensity, explore frame transmitting terminal noise information, and explore frame adopt the bit rate of modulation coding mode.
Wherein, described access point comprises:
Scanning frame receives transmission processing module, for receiving described explore frame and sending the response to described explore frame to terminal; And
Access point state information statistics module, for reporting the state information of AP and terminal and providing the inquiry service of state information of AP and terminal for controller to controller cycle.
Wherein, described controller comprises:
Terminal positioning module, for positioning terminal;
Access point position information storage module, for storing the positional information of each access point;
Connect the communication module of AP, for receiving described explore frame infomational message and issuing response message; And
Decision-making module, for carrying out channel decision and access point decision-making according to the position of terminal and access point and the loading condition of each channel, and for maintenance task collection, the channel that described task-set record terminal MAC address and the up-to-date channel decision for corresponding terminal obtain.
Wherein, described N number of channel that do not interfere with each other adopts identical SSID.
Wherein, for described N number of each channel do not interfere with each other in channel, the mode of space-intensive type is adopted to dispose described access point.
According to a further aspect in the invention, additionally provide a kind of load-balancing method of the channel loading equalizing system based on aforementioned multichannel wireless local area networks, it comprises the following steps:
1) explore frame that sends of access point receiving terminal;
2) described access point generates explore frame infomational message and is uploaded to described controller, and described explore frame infomational message comprises the wireless signal header information and terminal MAC address extracted in described explore frame;
3) the explore frame infomational message uploaded according to multiple described access point of controller, the selected terminal sending original explore frame accesses channel and the access point of described WLAN (wireless local area network), and issues response message to selected described access point;
4) described selected access point receives the response message that described controller issues, and then sends the response of described explore frame to described terminal, and then connects with described terminal.
Wherein, described step 2) comprise substep:
21) described access point extracts the wireless signal header information of explore frame, packs to described wireless signal header information and terminal MAC address, generates explore frame infomational message;
22) described access point is by step 21) the explore frame infomational message that generates is uploaded to described controller.
Wherein, described step 3) comprise substep:
31) controller receives explore frame infomational message, extracts the terminal MAC address wherein carried and the channel belonging to access point uploading this explore frame infomational message;
32) concentrate in task carry out query steps 31) terminal MAC address that extracts, if do not find this terminal MAC address, directly start to carry out channel decision, after obtaining channel decision result, this terminal MAC address and gained channel are added in described task-set; If find this terminal MAC address, then enter step 33); Described task-set record terminal MAC address and the channel obtained for the up-to-date channel decision of corresponding terminal;
33) judge that whether the channel that the described terminal MAC address of described task centralized recording is corresponding is consistent with the channel belonging to the access point uploading current explore frame infomational message, if, then enter step 34), otherwise directly abandon current explore frame infomational message, return step 31) start to receive next explore frame infomational message;
34) in the range of channels corresponding to described terminal MAC address of task-set current record, carry out access point decision-making, obtain selected access point;
35) leave out the record corresponding to described terminal MAC address in task-set, issue response message to described selected access point.
Wherein, described step 32) in, the method for described channel decision comprises:
321) alternative access point set is chosen according to terminal;
322) choose in alternative access point set the channel that the minimum channel of average load will access as this terminal.
Wherein, described step 321) comprise substep:
3211) terminal positioning is carried out;
3212) the access point set adjacent with described terminal to be accessed is chosen as alternative access point set.
Wherein, described step 32) also comprise: choose affiliated area corresponding to terminal according to historical record, build the alternative AP set corresponding to this terminal with the AP in this affiliated area.
Wherein, described step 322) in, the minimum channel of described average load draws with the residue hardware resource of each access point in described alternative access point set and the residue throughput within the unit interval according to belonging in channel.
Wherein, described step 34) in, the method of access point decision-making is: on the channel corresponding to described terminal MAC address of task-set current record, the access point selecting received signal strength indicator maximum from described alternative access point set is as selected access point.
Compared with prior art, the present invention has following technique effect:
1, the present invention can the low channel loading equilibrium realizing WLAN with lower expense.
2, channel loading equalization scheme of the present invention is to being that terminal is transparent, is easy to promote.
3, the present invention can ensure that terminal has higher message transmission rate at an arbitrary position.
4, the present invention is particularly suitable for the enterprise-level deployment of WLAN.
Accompanying drawing explanation
Below, describe embodiments of the invention in detail by reference to the accompanying drawings, wherein:
Fig. 1 shows the deployment schematic diagram of the channel loading equalizing system of the multichannel wireless local area networks of one embodiment of the invention;
Fig. 2 shows the schematic flow sheet of the terminal access WLAN of the channel loading equalizing system of the multichannel wireless local area networks based on one embodiment of the invention;
Fig. 3 shows the flow chart of data processing figure of the controller of one embodiment of the invention.
Embodiment
According to one embodiment of present invention, provide a kind of channel loading equalizing system of multichannel wireless local area networks, comprise controller and AP.Fig. 1 shows the deployment schematic diagram of the channel loading equalizing system of the multichannel wireless local area networks of one embodiment of the invention, with reference to figure 1, the channel loading equalizing system of this multichannel wireless local area networks comprises multiple AP:AP1, AP2, AP3, AP4, they are all deployed under same gateway GW, and by gateway GW connection control device CT.Controller CT is then deployed on gateway, by gateway accessing WLAN.It should be noted that, Fig. 1 is only a deployment example of the channel loading equalizing system of multichannel wireless local area networks, and the quantity of controller is not limited to one, and deployed position neither be unique.Such as, controller can have multiple stage, and deployed position can be the Layer2 switching network in gateway, also can be the IP network residing for gateway, as long as network can reach between controller and AP.AP quantity is usually more, and is not only confined to four.
In the present embodiment, all AP are divided into N number of part, are deployed in respectively N number ofly not interfere with each other channel, and like this, each channel forms a channel layer.Exemplarily, in FIG, AP1 is deployed in the first channel, and AP2 is deployed in second channel, and AP3, AP4 are then deployed in the 3rd channel.Each AP channel layer adopts identical SSID, and what adopt with layer AP is the deployment scheme of space-intensive type, makes the AP signal of each channel layer cover the required place (such as large organization mechanism, large-scale meeting-place etc.) disposed of WLAN (wireless local area network) completely.
In the present embodiment, each AP is used for when receiving explore frame (the Probe Request) that terminal is sent, from this explore frame, extract wireless signal header information, and generate new message after adding the information such as terminal MAC, newer message is uploaded to controller.Meanwhile, AP also for receiving after controller issues control information, the explore frame of response terminal, thus connect with terminal.In one example in which, AP comprises that scanning frame receives, the state information statistics module of transmission processing module and AP.Wherein, scanning frame receives transmission processing module for receiving described explore frame and sending the response to described explore frame to terminal; Access point state information statistics module is used for the inquiry service of the state information reporting the state information of AP and terminal to controller cycle and provide AP and terminal for controller.
In the present embodiment, controller for preserving the positional information of whole AP, and for the loading condition of the position and channel that judge terminal, the channel that this terminal of fast selecting will access and AP.Decision rule can according to circumstances be determined.Controller also for after determining the channel that terminal will access and AP, issues control information to corresponding AP, and allows this AP respond the explore frame of this terminal, thus completes the cut-in operation of terminal.In one example in which, controller comprises terminal positioning module, AP positional information memory module, connects communication module and the decision-making module of AP.Wherein, terminal positioning module is used for positioning terminal; Access point position information storage module is for storing the positional information of each access point; Connect the communication module of AP for receiving described explore frame infomational message and issuing response message; Decision-making module is used for carrying out channel decision and access point decision-making according to terminal and the position of access point and the loading condition of each channel, and for maintenance task collection, the channel that described task-set record terminal MAC address and the up-to-date channel decision for corresponding terminal obtain.
According to another embodiment of the invention, additionally provide a kind of channel loading equalization methods of multichannel wireless local area networks, the method realizes based on the channel loading equalizing system of aforementioned multichannel wireless local area networks.Fig. 2 shows the schematic flow sheet of the terminal access WLAN of the channel loading equalizing system of the multichannel wireless local area networks based on one embodiment of the invention, STA GC group connector in figure, CT represents controller, AP1 and AP2 is two exemplary AP, in prior art, the process of terminal access WLAN is connected voluntarily by terminal and AP, and in the present embodiment, controller, a series of Signalling exchange can be carried out between AP and terminal, carry out the process of terminal access WLAN, and in the process of access WLAN, complete the load balancing of system with lower expense.With reference to figure 2, in the present embodiment, the process of terminal access WLAN comprises the steps:
Step 1: terminal sends explore frame.
Step 2: neighbouring AP receives explore frame, carrying out explore frame processing the new message generating and comprise explore frame wireless signal header information and corresponding terminal MAC information, for ease of describing, hereinafter this new message being called explore frame infomational message.
In the present embodiment, AP has the dedicated module operated on network card interface, namely explore frame receives transmission processing module, and in the present embodiment, explore frame receives transmission processing module can extract the speed that in explore frame (Probe Request), terminal is supported.In addition, this module is also resolved the Radiotap head of radio frames.Information in Radiotap head comprises the signal strength signal intensity of reception, the bit rate of modulation coding mode, and the wireless parameter such as noise.This explore frame receives the part wireless parameter packing that terminal MAC address and Radiotap head also comprise by transmission processing module, generates previously described explore frame infomational message, and is uploaded to controller.Wherein, channel that explore frame uses is with taking 1 byte, and terminal MAC address takies 6 bytes.Table 1 shows an example of explore frame infomational message structure.Wherein, channel belonging to channel that original explore frame uses and local AP, it should be noted that, this channel can be carried by explore frame, also the AP information list can safeguarded by controller is inquired about, what the present embodiment adopted is the mode that explore frame carries, and contributes to the burden reducing controller like this.
Table 1
| Frame type | Channel | Terminals physical address | Frame information |
| Type | RADIOTAP_CHANNEL | MAC | RADIOTAP_FLAGS |
| Speed | Transmitted power | Transmitting terminal signal strength signal intensity | Transmitting terminal noise intensity |
| RADIOTAP_RATE | TX_POWER | DBM_ANTSIGNAL | DBM_ANTNOISE |
Step 3: controller receives the explore frame infomational message based on explore frame that each AP uploads, for each received explore frame infomational message, according to the collecting and distributing list of terminal MAC address query task of carrying in explore frame infomational message, the MAC Address of carrying according to received explore frame infomational message and the match condition of explore frame channel and task-set hash table, carry out channel decision and access AP decision-making.Wherein, wherein, task-set hash table adopts the mode of Key-Value to build, and Key is terminal MAC, Value is channel designator, in order to guaranteed efficiency, queue adopts hash table structure, but the present invention also can adopt other data structure to build task-set, such as binary tree, RBTree, balanced binary tree (Adelson-Velskii-Landis tree) etc.
Fig. 3 shows the data processing sub-process of step 3 middle controller based on received explore frame infomational message of one embodiment of the invention, and with reference to figure 3, controller comprises substep based on the data processing sub-process of received explore frame infomational message:
Step 301: controller receives explore frame infomational message.
Step 302: explore frame infomational message is processed.Extract the terminal MAC address and channel number that wherein carry.
Step 303: carry out task-set hash table inquiry based on terminal MAC address, judges whether to find corresponding terminal MAC address in the Key value of the collecting and distributing list of task, if so, then enters step 310, if not, then performs step 304.
Step 304: carry out terminal positioning, obtains the position of terminal.Herein terminal refer to send initial probe frame etc. the terminal of to be accessed WLAN (wireless local area network), hereinafter referred to as current terminal to be accessed.The method of carrying out terminal positioning has multiple, such as: the communication control module of controller presets a time cycle, this time cycle can receive the explore frame infomational message that all AP upload by basic guarantee within this cycle, like this, for any one terminal, can obtain this terminal to each signal strength signal intensity that can receive the AP of this end-probing frame, the WLAN terminal localization method (such as propagation model method and location fingerprint method etc.) that recycling is ripe can position terminal.
Step 305: choose the AP adjacent with described terminal to be accessed and gather.After controller obtains the position of terminal, according to the radius threshold preset, centered by terminal, choose the AP within the scope of radius threshold at each channel layer, as the AP set that terminal to be accessed is adjacent.The practical function of this step is the alternative AP set choosing terminal to be accessed, in the present embodiment, the AP adjacent with the current present position of terminal to be accessed is gathered and gather as alternative AP, but this mode of choosing not is unique, such as, in another embodiment, this terminal to be accessed most of the time affiliated area can be chosen according to historical record, and the AP set in this region is gathered as alternative AP.
Step 306: carry out channel decision, the channel that described in decision-making, current terminal to be accessed should access.In alternative AP set, choose the channel that the minimum channel of average load will access as this terminal.
Wherein, load information is provided to controller by the state information statistics module of AP.For arbitrary AP, what the state information that its state information statistics module provides comprised current this AP hardware resource takies situation, the traffic statistics etc. of the time period of the nearest a certain setting of terminal that this AP associates, the mode obtained can adopt periodically active reporting, also can take the passive acknowledgement mechanism that controller is inquired.Cycle active reporting can allow AP according to the time cycle of setting, uploads the message of JSON form, then issues a query messages by controller, wherein can carry the parameter field of inquiry, such as terminal current data rate etc. under passive acknowledgement mechanism.Then AP uploads the message of JSON form, and the JSON message format uploaded under two kinds of interactive modes is identical.JSON message format includes but not limited to following several respects: a) the hardware resource service condition (the free time ratio etc. of cpu load/EMS memory occupation/radio-frequency module) of this AP; B) access the traffic statistics of all terminals of this AP, be generally setting unit interval in average throughput.
In one example in which, for arbitrary AP, its load comprises two and estimates: a) this AP remains hardware resource, b) the residue throughput of this AP within the unit interval.The weight making AP remain hardware resource and the residue throughput in the unit interval is respectively λ and μ, then remaining load capacity W=a* λ+b* μ, for arbitrary channel that the AP that terminal to be accessed is adjacent gathers, belonging to the average residual load capacity of the AP of this channel, is exactly the residue average load of this channel.Residue average load capacity is larger, then average load is minimum, therefore gets W
maxcorresponding channel can obtain the minimum channel of average load.
Step 307: the signal (being the channel that this terminal is distributed) MAC Address of current terminal to be accessed and institute's decision-making gone out adds described task-set hash table.
Step 308: judge whether channel mates, namely judge whether channel corresponding to the MAC Address in task-set hash table mates with the channel in current explore frame infomational message (the explore frame infomational message that step 301 is current received), if not, then abandon current explore frame infomational message, get back to step 301, start to receive next explore frame infomational message, if so, continue to perform step 309.
Step 309: the AP (hereinafter referred selectes AP) that the current terminal to be accessed of decision-making should access, then performs step 311.In one embodiment, AP decision-making is completed by received signal strength indicator (RSSI), namely chooses the AP that the maximum AP of RSSI will access as current terminal to be accessed.RSSI can obtain according to explore frame infomational message.
Step 310: judge whether the channel in described task-set hash table corresponding to current terminal to be accessed MAC mates with the channel extracted from explore frame infomational message, if, then perform step 309, if not, then abandon current explore frame infomational message, then get back to step 301, start to receive next explore frame infomational message.If the channel in task-set hash table corresponding to current terminal to be accessed MAC does not mate with the channel extracted from explore frame infomational message, illustrate that the AP uploading current explore frame infomational message has been assigned with channel and its channel is inconsistent with the channel of institute's decision-making in the past.This may be because terminal moves, and in order to obtain more excellent AP decision-making, waiting for that this terminal scanning is to the AP belonging to decision-making channel (channel namely recorded in task-set hash table), then carrying out AP decision-making.
Step 311: issue response message to selected AP, this response message comprises the control information such as current channel decision and access AP decision-making, selectes AP like this and just can know by self access AP as current terminal to be accessed.
Step 312: the occurrence of current terminal to be accessed MAC deleted by controller from task hash table.After step 312 completes, return step 301, start to receive next explore frame infomational message.
Step 4: selected AP receives the response message of explore frame message, then sends the response of explore frame, and then connects with terminal to terminal.Such terminal just accesses WLAN by this AP.
Further, according to a preferred embodiment of the present invention, after step 311 completes above, directly described step 4 is performed.In described step 4, selected AP, after connecting with terminal to be accessed, returns confirmation (such as OK message) to controller.After completing steps 4, then perform described step 312.In step 312, controller after receiving the confirmation that selected AP returns, then deletes the occurrence of current terminal to be accessed MAC from task hash table.
In above-described embodiment, whole WLAN can realize channel loading equilibrium with lower expense, and can ensure that terminal has higher message transmission rate at an arbitrary position.Further, the process of above-mentioned terminal access WLAN is transparent to terminal itself, does not need to carry out any transformation to terminal.
Finally it should be noted that, above embodiment is only in order to describe technical scheme of the present invention instead of to limit this technical method, the present invention can extend in application other amendment, change, application and embodiment, and therefore think that all such amendments, change, application, embodiment are all in spirit of the present invention and teachings.
Claims (14)
1. a channel loading equalizing system for multichannel wireless local area networks, comprise at least one controller of accessing WLAN and be deployed in N number of multiple access points not interfereing with each other channel, wherein N is at least two;
Described access point is used for when receiving the explore frame that terminal sends, and generate explore frame infomational message and be uploaded to described controller, described explore frame infomational message comprises the wireless signal header information and terminal MAC address extracted in described explore frame; Described access point also for sending the response of described explore frame to described terminal when receiving the response message that described controller issues, and then connects with described terminal;
Described controller is used for the explore frame infomational message uploaded according to multiple described access point, and the selected terminal sending original explore frame accesses channel and the access point of described WLAN (wireless local area network), and issues response message to selected described access point.
2. the channel loading equalizing system of multichannel wireless local area networks according to claim 1, it is characterized in that, described wireless signal header information comprises: channel that explore frame uses, explore frame transmitting terminal signal strength signal intensity, explore frame transmitting terminal noise information, and explore frame adopt the bit rate of modulation coding mode.
3. the channel loading equalizing system of multichannel wireless local area networks according to claim 2, is characterized in that, described access point comprises:
Scanning frame receives transmission processing module, for receiving described explore frame and sending the response to described explore frame to terminal; And
Access point state information statistics module, for reporting the state information of AP and terminal and providing the inquiry service of state information of AP and terminal for controller to controller cycle.
4. the channel loading equalizing system of multichannel wireless local area networks according to claim 2, is characterized in that, described controller comprises:
Terminal positioning module, for positioning terminal;
Access point position information storage module, for storing the positional information of each access point;
Connect the communication module of AP, for receiving described explore frame infomational message and issuing response message; And
Decision-making module, for carrying out channel decision and access point decision-making according to the position of terminal and access point and the loading condition of each channel, and for maintenance task collection, the channel that described task-set record terminal MAC address and the up-to-date channel decision for corresponding terminal obtain.
5. the channel loading equalizing system of multichannel wireless local area networks according to claim 1, is characterized in that, described N number of channel that do not interfere with each other adopts identical SSID.
6. the channel loading equalizing system of multichannel wireless local area networks according to claim 2, is characterized in that, for described N number of each channel do not interfere with each other in channel, adopts the mode of space-intensive type to dispose described access point.
7., based on a load-balancing method for the channel loading equalizing system of multichannel wireless local area networks according to claim 1, it is characterized in that, comprise the following steps:
1) explore frame that sends of access point receiving terminal;
2) described access point generates explore frame infomational message and is uploaded to described controller, and described explore frame infomational message comprises the wireless signal header information and terminal MAC address extracted in described explore frame;
3) the explore frame infomational message uploaded according to multiple described access point of controller, the selected terminal sending original explore frame accesses channel and the access point of described WLAN (wireless local area network), and issues response message to selected described access point;
4) described selected access point receives the response message that described controller issues, and then sends the response of described explore frame to described terminal, and then connects with described terminal.
8., according to based on load-balancing method according to claim 7, it is characterized in that, described step 2) comprise substep:
21) described access point extracts the wireless signal header information of explore frame, packs to described wireless signal header information and terminal MAC address, generates explore frame infomational message;
22) described access point is by step 21) the explore frame infomational message that generates is uploaded to described controller.
9., according to based on load-balancing method according to claim 8, it is characterized in that, described step 3) comprise substep:
31) controller receives explore frame infomational message, extracts the terminal MAC address wherein carried and the channel belonging to access point uploading this explore frame infomational message;
32) concentrate in task carry out query steps 31) terminal MAC address that extracts, if do not find this terminal MAC address, directly start to carry out channel decision, after obtaining channel decision result, this terminal MAC address and gained channel are added in described task-set; If find this terminal MAC address, then enter step 33); Described task-set record terminal MAC address and the channel obtained for the up-to-date channel decision of corresponding terminal;
33) judge that whether the channel that the described terminal MAC address of described task centralized recording is corresponding is consistent with the channel belonging to the access point uploading current explore frame infomational message, if, then enter step 34), otherwise directly abandon current explore frame infomational message, return step 31) start to receive next explore frame infomational message;
34) in the range of channels corresponding to described terminal MAC address of task-set current record, carry out access point decision-making, obtain selected access point;
35) leave out the record corresponding to described terminal MAC address in task-set, issue response message to described selected access point.
10., according to based on load-balancing method according to claim 9, it is characterized in that, described step 32) in, the method for described channel decision comprises:
321) alternative access point set is chosen according to terminal;
322) choose in alternative access point set the channel that the minimum channel of average load will access as this terminal.
11., according to based on load-balancing method according to claim 10, is characterized in that, described step 321) comprise substep:
3211) terminal positioning is carried out;
3212) the access point set adjacent with described terminal to be accessed is chosen as alternative access point set.
12., according to based on load-balancing method according to claim 10, is characterized in that, described step 32) also comprise: choose affiliated area corresponding to terminal according to historical record, build the alternative AP set corresponding to this terminal with the AP in this affiliated area.
13. bases are based on load-balancing method according to claim 10, it is characterized in that, described step 322) in, the minimum channel of described average load draws with the residue hardware resource of each access point in described alternative access point set and the residue throughput within the unit interval according to belonging in channel.
14. bases are based on load-balancing method according to claim 10, it is characterized in that, described step 34) in, the method of access point decision-making is: on the channel corresponding to described terminal MAC address of task-set current record, the access point selecting received signal strength indicator maximum from described alternative access point set is as selected access point.
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| CN201510434117.5A CN105025525B (en) | 2015-07-22 | 2015-07-22 | A kind of channel loading equilibrium system and method for multichannel wireless local area networks |
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