CN1601979A - Load balancing method of radio access point - Google Patents
Load balancing method of radio access point Download PDFInfo
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Abstract
The method includes following steps: starting up each load balancing application service at each AP participating in load balancing; each AP sends query request to other AP in sequence, and updating own balancing information base based on information returned from other AP; based on own updated balancing information base, each AP determines whether a user is allowed to access in at present by using balancing algorithm; if receiving an end command, then AP exits load balancing; otherwise, restarting to update own balancing information base in each period of time, and executing followed steps. The invention guarantees new wireless client end is connected to AP with fewer loads automatically. The method does not need server at background. Fault-tolerance is raised since distribution mode is used in the method.
Description
Technical field
The present invention relates to a kind of network load balancing method, especially a kind of load-balancing method that is applied to the access point of wireless network.
Background technology
The number of visitors that the quick growth of the Internet makes the webserver face increases fast.Especially each server part, its data traffic and calculating strength are big, make single equipment can't bear at all.And how to finish the rational traffic carrying capacity distribution of realization between a plurality of network equipments of said function, be unlikely to occur one equipment is busy excessively and other equipment is not given full play to the situation of disposal ability, just become a very problem of reality, therefore load-balancing mechanism also arises at the historic moment.
Load balancing to a network is used, and can start with from the different levels of network, and concrete condition will be seen the concrete analysis to the network bottleneck whereabouts.Realize that at present load balancing mainly contains following method: one is based on the load balancing of particular server software, and two are based on the load balancing of name server, and the 3rd, utilize reverse proxy to realize load balancing, four are based on the load balancing of network address translation.
Along with the fast development of wireless technology, wireless client terminal increases in numbers swiftly, and the burden of the key equipment AP of wireless access (Access Point WAP (wireless access point)) also increases the weight of, single equipment can't be born, therefore, realizing equally loaded between many AP, is a very important problem.
At present on some wireless aps, also adopted load balancing to alleviate load on the single AP, the basic framework of realizing as shown in Figure 1, the whole proposal of load balancing is that cable network is realized, by the private server on backstage load average is distributed to each AP.This load balancing implementation pattern at wireless network AP, owing to need private server, so cost is than higher; Must be connected by cable network between AP and the server, not be suitable for simple wireless network; And the development cost height, poor fault tolerance, in a single day server goes wrong, then whole load-balancing function collapse.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of load-balancing method of WAP (wireless access point), each AP stores other state information that participates in the AP of load balancing, can whether allow new client to insert according to the load allocating situation decision of current network, load is assigned on each AP by equilibrium by the client's number or the flow of current access.
Method of the present invention comprises the steps:
Step 1, the balanced application service of starting load on each participation load balancing AP;
Step 2, each AP participate in load balancing to other successively and send query requests; The AP that receives query requests makes response to query requests, sends the information of self to the AP that sends query requests; The AP that sends query requests is according to the return information update own balancing information;
Step 3, each AP utilize according to self updated balancing information base whether the equalization algorithm decision is current allows the client to insert;
If step 4, AP receive the finish command, then withdraw from load balancing; Otherwise, behind the certain interval of time, re-execute step 2.
The present invention is by the intercommunication mutually between the AP, make each AP all store the state information that other participates in the AP of load balancing, whether each AP can allow new client to insert according to the load allocating situation decision of current network, client connects according to the indication of AP AP automatic and that load is less, guarantee in the wireless communication system, new wireless client is linked on the less AP of load automatically, realized the load balancing of WAP (wireless access point), and do not need background server, reduced the cost of load balancing; Distributed mode has also improved the fault-tolerant ability of load balancing.
Description of drawings
Fig. 1 is the hardware platform of load balancing of the prior art;
Fig. 2 is the schematic diagram of the relation between each module of the present invention;
Fig. 3 is the flow chart of the inventive method.
Embodiment
With embodiment technical scheme of the present invention is elaborated with reference to the accompanying drawings below:
In wireless network, each AP is access network independently, and the IP address of oneself is all arranged.In order to reduce cost, do not have special server in the inventive method, and adopted distributed realization load-balancing method, each adds the balanced AP backstage load balancing application service that all independent operating is identical.
The load balancing application service as shown in Figure 2, comprises the communication module of client port processing module, serve port processing module, SNMP communication module and wireless network driver; All modules are all operated the load-balancing information storehouse.
The client port processing module sends the current information that query statement obtains other AP to other AP, upgrades the load-balancing information storehouse;
The query requests from other AP is analyzed and handled to the server-side processes module, and the feedback information that obtains oneself from the load-balancing information storehouse is given the requesting party;
SNMP (Simple Network Management Protocol, Simple Network Management Protocol) communication module realizes the access and the initialization of load balancing relevant configuration data;
The communication module of wireless network driver, according to the load balancing result, realization is communicated by letter with wireless network driver, comprises being provided with allowing new client to insert flag bit and obtain current access customer number and flow.
Method of the present invention comprises the steps:
Step 1, the balanced application service of starting load on each participation load balancing AP;
Step 2, each AP participate in load balancing to other successively and send query requests; The AP that receives query requests makes response to query requests, sends the information of self to the AP that sends query requests; The AP that sends query requests is according to the return information update own balancing information;
Step 3, each AP utilize according to self updated balancing information base whether the equalization algorithm decision is current allows the client to insert;
If step 4, AP receive the finish command, then withdraw from load balancing; Otherwise, behind the certain interval of time, re-execute step 2.
Wireless client is according to wireless network 802.11 agreements, carry out the AP inquiry by a channel at every turn, send connection request, if corresponding AP does not exist or does not allow the client to insert, the client is the inquiry one other channel automatically, send connection request to another AP, automatically search the AP that can admit, therefore, load-balancing method of the present invention is refused new client by high capacity AP, low load AP admits the load balancing that has just realized the AP access point to new client, does not need background server, and cost is greatly reduced; And each AP is the calculating of independently carrying out load balancing, can not go wrong and has influence on whole system because of an AP.
Step 1 of the present invention, the balanced application service of each AP starting load comprises following process: each AP obtains the required information of the balanced application service of running load according to the configuration file of self, the application service of beginning load balancing.
The required information of the balanced application service of running load comprises the type of load balancing, the IP tabulation of the AP of the threshold value of load-balancing algorithm and participation load balancing.The type of load balancing comprises by flow with by number of users; The threshold value of load-balancing algorithm is different and different according to the type of load balancing and the load-balancing algorithm of self, and is also relevant with the disposal ability of AP self and possible the number of users of being served, definite according to actual conditions by the network manager.Such as, to the WLAN (wireless local area network) among a small circle of office, can select the number of users type and, and threshold value gets 10 based on the weighted average algorithm of threshold value.
AP obtains these parameters by the configuration file that is kept among the AP.The keeper can utilize the WEB configuration interface of the built-in web page server of AP to start and finish the application service of AP load balancing, also can pass through WEB configuration interface input parameter, by load balancing application service SNMP module, more corresponding parameters in the new configuration file.
Step 2 of the present invention specifically comprises the steps:
In the described step 2, AP sends query requests, upgrades self equalization information storehouse according to the return information of other AP, specifically comprises the steps:
Step 20, each AP begin to take turns and seek the IP tabulation that participates in load balancing in self equalization information storehouse;
Step 21, judge whether arrival table tail, if arrived the table tail, end step two; Otherwise carry out next step;
Step 22, selected next AP send query requests to selected AP;
Step 23, the query requests response results that selected AP is returned are analyzed;
The information of preserving in step 24, the renewal equalization information storehouse, execution in step 21;
After the balanced application service of starting load, at first to obtain to carry out the information that load balancing is calculated the AP of each required participation load balancing, so will begin to take turns the IP tabulation of seeking the participation load balancing from first AP by the client port processing module.
After above step 22 and before the step 23, also comprise following process: whether the time of judging the response of waiting for selected AP surpasses the predefined time, if surpass the predefined time, then this AP is got rid of balanced scope, do not participate in balanced calculating, execution in step 24 is upgraded the equalization information storehouse, is set at this AP inactive; Otherwise, execution in step 23.
Increase whether overtime judgement is because the AP in the IP tabulation may not have in running order, or be not activated the load balancing application service, or be busy with one's work, can't the client who insert be handled, so in order to raise the efficiency, the setting time-out time is incited somebody to action AP in this case, gets rid of balanced scope.Generally speaking, time-out time is set at 2 seconds.
The load balancing application service is made response by the server-side processes module to the request of other AP of receiving, requirement according to algorithm obtains equalization information from the equalization information storehouse of self, as balanced type, the number of users of self and data on flows, and self allows or the state information of refusing new client, with the network information of these information and self setting, as IP and SSID (Service SetIdentifier, network name), return to the AP of the request of transmission, be specially following steps:
After step 26, AP receive query requests, from the current equalization data of equalization information storehouse acquisition self of self;
Step 27, the equalization data that self is current are assembled into request response data;
Step 28, transmission request response data are to the AP that sends query requests.
The AP that sends query requests will analyze the information of returning after obtaining information that other AP return, because only in identical network, it is just meaningful to carry out load balancing under the identical balanced type, and this is the prerequisite of load calculation.Described the information of returning is analyzed, specifically comprised the steps:
Whether the SSID of the AP that step 230, judgement are selected is identical with self, if identical, carries out next step; Otherwise this AP is got rid of balanced scope, do not participate in balanced calculating, execution in step 24 is upgraded the equalization information storehouse, is set at this AP inactive;
Whether the balanced type of the AP that step 231, judgement are selected is identical with self, if identical, carries out next step; Otherwise this AP is got rid of balanced scope, do not participate in balanced calculating, execution in step 24 is upgraded the equalization information storehouse, is set at this AP inactive;
In the equalization information storehouse, comprise the IP tabulation that participates in balanced AP, and current number of users and the flow of each AP, signal strength signal intensity and allow equalization information such as state, AP whenever obtains the response message that another AP returns, just upgrade the equalization information storehouse to information that should AP, and at regular intervals, just take turns all AP in the IP tabulation of seeking in the equalization information storehouse, with the information updating of AP all in the equalization information storehouse once, the equalization information of acquisition activity AP tabulation and movable AP, with the real-time of guarantee information, the load balancing application service is carried out load balancing according to the information in the equalization information storehouse and is calculated.
Step 3 of the present invention further comprises the steps:
Step 30, utilize equalization algorithm, calculate the load critical value that allows new user to insert; If present load is less than or equal to the load critical value, allow new user to insert; If present load greater than the load critical value, does not then allow new user to insert; Or utilize equalization algorithm, directly whether decision allows new user to insert;
Step 31, the Drive Layer of passing wireless network with the information of step 30,31 permission or do not allow the result to set the sign that allows new client to insert set by step.
Drive Layer at wireless network, bag of every transmission, all check and allow new client to insert sign, if allow new client to insert sign not for true, promptly do not allow new client to insert, then check the type of frame, if this frame is the connection request response frame, then the state position with this frame is 17, be Associationdenied because AP is unable to handle additional associated stations, notify the client " client that the AP that is attempting to connect connects is full, can not receive request ".The client turns to other AP request of connecting, and has realized load balancing with this.
AP judges that the equalization algorithm that self whether allows new user to insert has two kinds, and a kind of is to utilize equalization algorithm, calculates the load critical value that allows new user to insert; If present load is less than or equal to the load critical value, allow new user to insert; If present load greater than the load critical value, does not then allow new user to insert; The another kind of condition that inserts or refuse that directly provides for equalization algorithm.
In the aforesaid load-balancing algorithm, the computational load critical value can be used several different methods, and the simplest is weighted average algorithm based on threshold value, is calculated as follows:
T represents load critical value, t in the formula
1, t
2..., t
nRepresent active user's number or nearest average discharge that all enliven AP respectively, n enlivens the AP number for all, and s is number of users or the flow threshold that the keeper sets;
Or be calculated as follows:
T represents load critical value, t in the formula
1, t
2..., t
nRepresent active user's number or nearest average discharge that all enliven AP respectively, n enlivens the AP number for all, and w surpasses average user number or flow percentage threshold value for number of users or the flow that the keeper sets.
Though above algorithm is effectively simple, but under extremely special situation, just in time be in the wireless network edge such as certain user, can only communicate by letter with limited several AP, if these AP refuse this user, then the user can't access network in long-time, therefore, can adopt following algorithm that the weighted average algorithm based on threshold value is improved, directly provide the condition that allows and refuse to insert.
When receiving the query requests of other AP, except that sending number of users, also send the refusal record of current AP in the nearest polling cycle, every record comprises the information such as time that user ID (being generally MAC Address), signal strength signal intensity, request insert.
The step whether the AP decision allows new user to insert is as follows:
Step 300, use weighted average algorithm computation load critical value,, then receive new user's access request, end step 30 if present load is less than or equal to the load critical value based on threshold value; If present load is carried out next step greater than the load critical value;
Whether the new user that step 301, judgement request connect was refused by current AP in certain period of time, if then refuse this new user's access, end step 30;
Step 302, inquire about the record that this user is refused by other AP in certain period of time, therefrom find out the highest record of signal strength signal intensity, establishing its signal strength signal intensity is x, supposes that this user is y with the signal strength signal intensity that is connected of current AP, then when y/x＜z, refuse this new user's access; Otherwise receive this new user, wherein z is a fixing threshold value, and span is between 0.5-1.
Special time period in the above method can be the one-period of client's inquiry, and promptly the client has inquired about all channels and once is one-period, and also can be described as and sending a connection request to all AP is one-period.Because signal strength signal intensity has reflected communication quality, for fear of some user who is in network edge can't access network in long-time, so when judging that the user has inquired about all AP failures, just user's signal strength signal intensity is judged, if the signal strength signal intensity that the user is connected with this AP is the strongest or near the strongest (according to the threshold value decision), just admit this user.
The detailed process of the aforesaid step 31 of the present invention is: load balancing use with wireless network driver be that form by IOCTL (INPUT/OUTPUT CONTRAL) communicates.Load balancing is used final result, and the form that promptly whether allows new client's access to be masked as with the IO request sends to the wireless network driver layer, and the sign that allows new user to insert is set at the wireless network driver layer.
The load-balancing function of AP involved in the present invention is used all information, comprise the IP address that participates in balanced AP, threshold value, balanced mode etc., can be configured by the WEB administration page of the built-in web page server of AP, by load balancing application service SNMP module, more corresponding parameters in the new configuration file.
By above description, the load-balancing method of WAP (wireless access point) of the present invention as can be seen, each WAP (wireless access point) can be regarded the part of equalizer as, and all participate in balanced AP and have constituted a big equalizer.Each AP has the IP address of oneself, be equalization server be again balanced client, constantly receive and respond the information inquiry of other AP as server, constantly send Query Information instruction, the IP tabulation that participates in balanced AP can be refreshed dynamically to other AP as client.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1, a kind of load-balancing method of WAP (wireless access point) is characterized in that: comprise the steps:
Step 1, the balanced application service of starting load on each participation load balancing AP;
Step 2, each AP send query requests to the AP that other participate in load balancing successively, simultaneously, the query requests of receiving is made response, self information is returned to the AP that sends query requests, each AP is according to the return information update own balancing information of other AP;
Step 3, each AP utilize according to self updated balancing information base whether the equalization algorithm decision is current allows the client to insert;
If step 4, AP receive the finish command, then withdraw from load balancing; Otherwise, behind the certain interval of time, re-execute step 2.
2, the load-balancing method of WAP (wireless access point) according to claim 1, it is characterized in that: in the described step 1, the balanced application service of each AP starting load, specifically comprise following process: each AP is according to the configuration file of self, obtain the required information of the balanced application service of running load, the application service of beginning load balancing.
3, the load-balancing method of WAP (wireless access point) according to claim 1 is characterized in that: in the described step 2, AP sends query requests, upgrades self equalization information storehouse according to the return information of other AP, specifically comprises the steps:
Step 20, each AP begin to take turns and seek the IP tabulation that participates in load balancing in self equalization information storehouse;
Step 21, judge whether arrival table tail, if arrived the table tail, end step two; Otherwise carry out next step;
Step 22, selected next AP send query requests to selected AP;
Step 23, the query requests response results that selected AP is returned are analyzed;
The information of preserving in step 24, the renewal equalization information storehouse, execution in step 21;
4, the load-balancing method of WAP (wireless access point) according to claim 1 is characterized in that: in the described step 2, AP makes response to the query requests of receiving, self information is returned to the AP that sends query requests, specifically comprises the steps:
After step 26, AP receive query requests, from the current equalization data of equalization information storehouse acquisition self of self;
Step 27, the equalization data that self is current are assembled into request response data;
Step 28, transmission request response data are to the AP that sends query requests.
5, the load-balancing method of WAP (wireless access point) according to claim 3, it is characterized in that: after the described step 22 and before the step 23, also comprise following process: whether the time of judging the response of waiting for selected AP is overtime, if it is overtime, this AP is got rid of balanced scope, do not participate in balanced calculating, execution in step 25; Otherwise, execution in step 23.
6, the load-balancing method of WAP (wireless access point) according to claim 3 is characterized in that: described step 23 further comprises the steps:
Whether the SSID of the AP that step 230, judgement are selected is identical with self, if identical, carries out next step; Otherwise this AP is got rid of balanced scope, do not participate in balanced calculating, execution in step 25;
Whether the balanced type of the AP that step 231, judgement are selected is identical with self, if identical, carries out next step; Otherwise this AP is got rid of balanced scope, do not participate in balanced calculating, execution in step 25;
7, the load-balancing method of WAP (wireless access point) according to claim 1 is characterized in that: described step 3 comprises the steps:
Step 30, utilize equalization algorithm, calculate the load critical value that allows new user to insert; If present load is less than or equal to the load critical value, allow new user to insert; If present load greater than the load critical value, does not then allow new user to insert; Or utilize equalization algorithm, directly whether decision allows new user to insert;
Step 31, the Drive Layer of passing wireless network with the information of step 30,30 permission or do not allow the result to set the sign that allows new client to insert set by step.
8, the load-balancing method of WAP (wireless access point) according to claim 7 is characterized in that: in the described step 30, the load critical value of computational load equilibrium adopts the weighted average algorithm based on threshold value, is calculated as follows:
T represents load critical value, t in the formula
1, t
2..., t
nRepresent active user's number or nearest average discharge that all enliven AP respectively, n enlivens the AP number for all, and s is number of users or the flow threshold that the keeper sets;
Or be calculated as follows:
T represents load critical value, t in the formula
1, t
2..., t
nRepresent active user's number or nearest average discharge that all enliven AP respectively, n enlivens the AP number for all, and w surpasses average user number or flow percentage threshold value for number of users or the flow that the keeper sets.
9, the load-balancing method of WAP (wireless access point) according to claim 7 is characterized in that: described step 30 specifically comprises the steps:
Step 300, use weighted average algorithm computation load critical value,, then receive new user's access request, end step 30 if present load is less than or equal to the load critical value based on threshold value; If present load is carried out next step greater than the load critical value;
Whether the new user that step 301, judgement request connect was refused by current AP in certain period of time, if then refuse this new user's access, end step 30;
Step 302, inquire about the record that this user is refused by other AP in certain period of time, therefrom find out the highest record of signal strength signal intensity, establishing its signal strength signal intensity is x, supposes that this user is y with the signal strength signal intensity that is connected of current AP, then when y/x＜z, refuse this new user's access; Otherwise receive this new user, wherein z is a fixing threshold value, and span is between 0.5-1.
10, the load-balancing method of WAP (wireless access point) according to claim 1, it is characterized in that: comprise the steps: that also WEB administration page input by the built-in web page server of AP comprises that the load-balancing function that relates to the IP address that participates in balanced AP, threshold value, balanced mode uses all information, and use these information updating configuration files, re-execute step 1.
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