CN101610593A - The method of access point, access controller and access point to select access controller - Google Patents
The method of access point, access controller and access point to select access controller Download PDFInfo
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- CN101610593A CN101610593A CNA2009100883530A CN200910088353A CN101610593A CN 101610593 A CN101610593 A CN 101610593A CN A2009100883530 A CNA2009100883530 A CN A2009100883530A CN 200910088353 A CN200910088353 A CN 200910088353A CN 101610593 A CN101610593 A CN 101610593A
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Abstract
The invention provides the method for a kind of access point, access controller and access point to select access controller.Described method comprises: after access controller receives the discovery request message of access point transmission, according to the sequence number that whether has disposed described access point on the current load condition of priority, this access controller of the described access point that disposes on this access controller and this access controller, calculated response time of delay; Described access controller is provided with a timer with described response time, and behind described timer expiry, respond the discovery response message to described access point, make the discovery response message corresponding access control device that described access point directly receives first, as the control access controller of oneself.According to the present invention, can improve the speed of access point to select access controller.
Description
Technical field
The present invention relates to WLAN (wireless local area network) (Wireless Local Area Network, WLAN) technology, particularly relate to access point in the WLAN (wireless local area network) (Access Point, AP), access controller (AccessController, AC) and the method for access point to select access controller.
Background technology
Disposing AP in a large number at needs provides for the user under the application scenarios of wireless access service, in order to solve configuration and operation maintenance problem to the huge AP of quantity, and security strategy application problem in the wireless network, WLAN centralized control type framework becomes modal solution.Fig. 1 is the structural representation of concentrated Radio Access Network.Among Fig. 1, be called thin AP (Fit AP), and control and the equipment of managing a plurality of Fit AP are AC for wireless user (Station) provides the AP of access service.AC sends configuration and other control information to Fit AP, with the AP exchange security information, obtains the data such as running status of AP.Under many application scenarioss, AC also is responsible for transmitting user data between Fit AP.
Because AC need manage Fit AP and transmit user data for it, so needs between the two to lay down a regulation, behavior pattern and information format when the definition both sides are mutual, this agreement is called the tunnel protocol of AC and Fit AP.Tunnel protocol relatively more commonly used at present is the WAP (wireless access point) configuration and safeguards (Configuration andProvisioning for Wireless Access Points, CAPWAP) agreement, defined tunnel between AC and the Fit AP automatic discovery, selection, consult, connect, process such as maintenance, the mode that issues configuration, reporting information between the two and transmit user data has been described, define the form and the type of tunnel protocol message, and solved the safety issue in tunnel.
One of content of CAPWAP tunnel agreement is automatic discovery and the choice mechanism between AC and the Fit AP.Because the configuration of Fit AP all is to preserve and issue by AC, so Fit AP at first must find own AC when starting, and successfully sets up with it just can get access to self after the tunnel and dispose.In addition, in the network at Fit AP place, may have the information that has disposed this AP on a plurality of AC, so AP needs also according to configuring condition and AC current state, for example the load height is selected an only AC.
Initiate searching and select the process of AC to be called discovery (Discovery) process, be divided into two steps: at first, Fit AP starts the back and sends discovery request (Discovery Request) message, seeks AC; AC responds and finds response (Discovery Response) message then, relevant information is offered Fit AP, for its selection.After the Discovery process finished, Fit AP chose suitable AC, and beginning consults to set up the tunnel with AC.
With reference to Fig. 2, the Discovery process of prior art specifically describes as follows:
AP enters the free time after system initialization (IDLE) state waits for that an IDLE at random after the time interval, begins peripherad Web broadcast Discovery Request.If do not receive response message, then send again once, till reaching maximum Discovery Request counting every the blanking time of a Discovery.If fail to receive response always, then AP can resolve to corresponding IP address to the possible AC domain name of DHCP/DNS server lookup, sends Discovery Request with clean culture then.
According to existing protocol, when the AC in the ambient network replied Discovery Response, AP started a Discovery waiting timer after receiving first response.If before waiting timer is overtime, there is new Discovery Response to arrive, this timer will be reset so, restart timing.After the waiting timer time-out time arrived, if there is not new Discovery Response, AP began to select suitable AC from the AC that has responded so.During selection, Fit AP at first goes up the priority of this AP of configuration according to the information in the AC message with reference to this AC, and the AC that the priority of AP is high preferentially chooses.Secondly with reference to the current load condition of AC, the light AC of load preferentially chooses.Last is the sequence number that has disposed AP with reference on this AC, still is configured to automatic AP (Auto AP), the preferential AC that selects to have disposed sequence number.If above-mentioned three whole identical, then select the AC (AC receive the DiscoveryRequest message after, make an immediate response) of response the earliest, begin to consult the process that the tunnel is set up.
In the above-mentioned Discovery process, AP is as the main body of selecting, need collect the response message of each AC makes decision afterwards, and the speed of selecting not only is subjected to the influence of AC response speed, also can be subjected to the influence of AC response message number: when having new Discovery Response to arrive, AP just needs the Discovery waiting timer of replacement oneself, no longer includes response message and arrive before timer expiry.When the waiting timer time interval is 2 seconds (the time interval value scope of agreement recommendation is worth greater than this), if the information that has a plurality of AC to preserve this AP in the network, for example 5, so under the extreme case, AP just needs 2 * 5=10 more than second at least in the wait process, could begin to select AC.And if have only an AC to preserve the message of this AP in the network, AP needs also to wait for that could begin to consult the tunnel about 2 seconds sets up.
Consider that finding and selecting the AC process is that Fit AP and AC set up the part in each handling process in tunnel, and AP and AC set up the important performance index that the speed in tunnel belongs to wireless centralized control type equipment, each link all needs to reduce the processing time as possible, thereby the stand-by period of AP in the Discovery process also should reduce as far as possible.
Summary of the invention
Technical problem to be solved by this invention provides the method for a kind of access point, access controller and access point to select access controller, to improve the speed of access point to select access controller.
For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:
A kind of method of access point to select access controller comprises:
After access controller receives the discovery request message of access point transmission, according to the sequence number that whether has disposed described access point on the current load condition of priority, this access controller of the described access point that disposes on this access controller and this access controller, calculated response time of delay;
Described access controller is provided with a timer with described response time, and behind described timer expiry, respond the discovery response message to described access point, make the discovery response message corresponding access control device that described access point directly receives first, as the control access controller of oneself.
Above-mentioned method, wherein, according to following formula calculated response time of delay:
Response time=automatic the factor * I+ load factor * J+ priority factors * K;
Wherein, when having disposed the sequence number of described access point on this access controller, the factor is 0 automatically, otherwise the factor is 1 automatically, and I, J, K are the weighted factor of time.
Above-mentioned method, wherein, described load factor is the ratio of access point number with the maximum access point number that can be connected of the current connection of this access controller.
Above-mentioned method, wherein, described load factor is the current utilance of the CPU of this access controller.
Above-mentioned method, wherein, priority factors=maxPri+1-PrioLevel, wherein, maxPri is a greatest priority, PrioLevel is the priority of the described access point that disposes on this access controller.
Above-mentioned method, wherein, I 〉=2J 〉=4K.
A kind of method of access point to select access controller comprises:
Request message is found in access point broadcasting;
The discovery response message corresponding access control device that access point directly receives first is as the control access controller of oneself;
Wherein, described discovery response message is: after access controller receives the discovery request message of access point transmission, according to the sequence number that whether has disposed described access point on the current load condition of priority, this access controller of the described access point that disposes on this access controller and this access controller, calculated response time of delay, with described response time one timer is set, and behind described timer expiry, to the discovery response message of described access point response.
A kind of access controller comprises:
The first message receiver module is used to receive the discovery request message that access point sends;
The response time computing module, be used for after the described first message receiver module receives described discovery request message, according to the sequence number that whether has disposed described access point on the current load condition of priority, this access controller of the described access point that disposes on this access controller and this access controller, calculated response time of delay;
Time delay module is used for described response time one timer being set;
The first message sending module is used for behind described timer expiry, responds to described access point and finds response message, makes the discovery response message corresponding access control device that described access point directly receives first, as the control access controller of oneself.
A kind of access point comprises:
The second message sending module is used for broadcasting and finds request message;
The second message receiver module is used to receive the discovery response message that access device sends;
Select module, be used for directly with first discovery response message corresponding access control device that receives, as the control access controller of oneself;
Wherein, described discovery response message is: after access controller receives the discovery request message of access point transmission, according to the sequence number that whether has disposed described access point on the current load condition of priority, this access controller of the described access point that disposes on this access controller and this access controller, calculated response time of delay, with described response time one timer is set, and behind described timer expiry, to the discovery response message of described access point response.
In the embodiments of the invention, AP does not need to be provided with the discovery response message that waiting timer is waited for a plurality of AC, but calculate a response time by receiving the AC that finds request message, after described response time arrives, respond to AP again and find response message, then, the AC of the discovery response message correspondence that AP directly receives first is as the control AC of oneself, so, reduce the spent time of Discovery process, and then can improve the speed of setting up the tunnel between AP and the AC.
Description of drawings
Fig. 1 is the structural representation of concentrated Radio Access Network;
Fig. 2 is the Discovery process schematic diagram of prior art;
Fig. 3 is the method flow diagram of the access point to select access controller of the embodiment of the invention;
Fig. 4 is the structural representation of the access point of the embodiment of the invention;
Fig. 5 is the structural representation of the access controller of the embodiment of the invention.
Embodiment
The factor that AP need consider when selecting AC comprises: whether disposed the sequence number of AP and the speed that AC responds on the current load condition of priority, the AC of the AP of the last configuration of AC, the AC.Wherein, the speed of AC response is last Consideration, and as seen preceding 3 factors all belong to for AC, therefore, embodiments of the invention are the discovery request messages that allow AC decide how to respond AP, that is, AC determines to respond the time of finding request message according to above-mentioned preceding 3 factors on this equipment, then, the AC of the discovery response message correspondence that directly first received of AP is as the control AC of oneself.Owing to do not need to be provided with the discovery response message that waiting timer is waited for a plurality of AC, therefore reduced the spent time of Discovery process, and then can improve the speed of setting up the tunnel between AP and the AC.
With reference to Fig. 3, the method for the access point to select access controller of the embodiment of the invention mainly comprises the steps:
Behind the step 301:AP electrifying startup, send discovery request (DiscoveryRequest) message by the mode of broadcasting;
After step 302:AC receives the discovery request message that AP sends, go up the sequence number that whether has disposed described AP on the current load condition of priority, this AC of described AP of configuration and this AC according to this AC, calculated response time of delay;
In this step, need check also whether this AC can become the control appliance of described AP, if, then calculate described response time, otherwise, do not calculate described response time, do not respond yet and find response (Discovery Response) message to described AP.
AC can for example, can calculate according to following formula according to the real needs flexible design for the algorithm of response time:
Response time=automatic the factor * I+ load factor * J+ priority factors * K;
Wherein, when having disposed the sequence number of described AP on this AC, the factor is 0 automatically, otherwise the factor is 1 automatically;
Described load factor is the ratio of AP number with the maximum AP number that can be connected of the current connection of this AC;
Priority factors=maxPri+1-PrioLevel, wherein, maxPri is a greatest priority, PrioLevel goes up the priority of the described AP of configuration for this AC.The priority span is 0～7, and it is high more to be worth big more then priority.
I, J, K are the weighted factor of time.Consider that the above-mentioned automatic factor, load factor and priority factors weight on the priority that decision AP selects is different, can allow weighted factor I 〉=2J 〉=4K.For example, can be provided with as follows: I=512ms, J=256ms, K=32ms.
Specifically be applied in the environment, supposing has AC1 in a certain network, and maximum can be born 128 AP, currently connected 20 AP, and disposed the sequence number of the AP that initiates to find request message, priority is 4, according to above-mentioned algorithm, response time equals so:
(0×512+[(20/128)256]+(7+1-4)×32)＝168ms
Other has an AC2, and is identical to other configuration of this AP, but duty ratio is higher, has connected 64 AP under the situation of maximum 128 AP, and response time equals:
(0×512+[(64/128)×256]+(7+1-4)×32)＝256ms
Be set with an AC3 again, this AP is configured to Auto, do not have assigned serial number, under the identical situation of load, response time equals:
(1×512+[(20/128)×256]+(7+1-0)×32)＝808ms。
Like this, among above-mentioned 3 AC, when almost receiving Discovery Request simultaneously, that send Discovery Response the earliest just is AC1.
Above-mentioned algorithm just illustrates, and does not represent or be confined to this type of algorithm.Different realizations can determine the size of weighted factor according to the significance level of the factor that needs are considered, and increase and decrease different factors of influence.
Step 303: described AC is provided with a timer with described response time, and behind described timer expiry, responds the discovery response message to described AP;
The AC of the discovery response message correspondence that step 304:AP directly receives first is as the control AC of oneself.
Corresponding with the method for above-mentioned access point to select access controller, the present invention also provides a kind of access point and access controller of realizing this method
With reference to Fig. 4 and Fig. 5, the access controller 40 of the embodiment of the invention comprises: the first message receiver module 41, response time computing module 42, time delay module 43 and the first message sending module 44; The access point 50 of the embodiment of the invention comprises: the second message sending module 51, the second message receiver module 52 and selection module 53.Wherein:
The second message sending module 51 is used for broadcasting and finds request message;
The first message receiver module 41 is used to receive the discovery request message that access point sends;
Response time computing module 42, be used for after the described first message receiver module 41 receives described discovery request message, according to the sequence number that whether has disposed described access point on the current load condition of priority, this access controller of the described access point that disposes on this access controller and this access controller, calculated response time of delay;
AC can for example, can calculate according to following formula according to the real needs flexible design for the algorithm of response time:
Response time=automatic the factor * I+ load factor * J+ priority factors * K;
Wherein, when having disposed the sequence number of described AP on this AC, the factor is 0 automatically, otherwise the factor is 1 automatically;
Described load factor is the ratio of AP number with the maximum AP number that can be connected of the current connection of this AC;
Priority factors=maxPri+1-PrioLevel, wherein, maxPri is a greatest priority, PrioLevel goes up the priority of the described AP of configuration for this AC.The priority span is 0～7, and it is high more to be worth big more then priority.
I, J, K are the weighted factor of time.Consider that the above-mentioned automatic factor, load factor and priority factors weight on the priority that decision AP selects is different, can allow weighted factor I 〉=2J 〉=4K.For example, can be provided with as follows: I=512ms, J=256ms, K=32ms.
The first message sending module 44 is used for behind described timer expiry, responds to described access point and finds response message;
The second message receiver module 52 is used to receive the discovery response message that access device sends;
In sum, embodiments of the invention are finished by choice mechanism is moved on the AC, thereby make AP that waiting timer needn't be set again, and the discovery response message that does not need to wait for a plurality of AC could be selected AC afterwards, has reduced the spent time of Discovery process.Especially in network, during the more AC of configuration, can shorten the stand-by period comparatively significantly.
In addition, the present invention has also improved in the prior art scheme to a certain extent for the thoughtful inadequately problem of load factor consideration.In the existing technical scheme, when AC notifies the load condition of oneself to AP, only can inform this AC goes up current what AP that connected, and this can not reflect the busy not busy degree of current AC reality.
For instance, the AC that two models are identical is current might all to have connected 30 AP, and they are when the AP that response is newly reached the standard grade so, and when adopting prior art, the loading level of notifying AP is identical.But in fact might be wherein the AP that connects of AC is current does not have too many user to insert, the loading level of AC own is not high, another AC is then because have more user's going on line or off line and need AC to transmit user data and cause systematic comparison busy.If employing the present invention, two AC adopt reply response to AP time of delay, not only can in algorithm, add " the current utilance of CPU " as one of factor of slow time of calculated response, and after that comparatively busy AC is provided with timer, when behind timer expiry, needing scheduler task to send Discovery Response message, will inevitably be more because of current task, the action that the busy and delayed response message of system sends.Like this, under the identical situation of other configuration, easier that the current not too busy AC that chooses of the AP that newly reaches the standard grade.
Should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spiritual scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (14)
1. the method for an access point to select access controller is characterized in that, comprising:
After access controller receives the discovery request message of access point transmission, according to the sequence number that whether has disposed described access point on the current load condition of priority, this access controller of the described access point that disposes on this access controller and this access controller, calculated response time of delay;
Described access controller is provided with a timer with described response time, and behind described timer expiry, respond the discovery response message to described access point, make the discovery response message corresponding access control device that described access point directly receives first, as the control access controller of oneself.
2. the method for claim 1 is characterized in that, according to following formula calculated response time of delay:
Response time=automatic the factor * I+ load factor * J+ priority factors * K;
Wherein, when having disposed the sequence number of described access point on this access controller, the factor is 0 automatically, otherwise the factor is 1 automatically, and I, J, K are the weighted factor of time.
3. method as claimed in claim 2 is characterized in that:
Described load factor is the ratio of access point number with the maximum access point number that can be connected of the current connection of this access controller.
4. method as claimed in claim 2 is characterized in that:
Described load factor is the current utilance of the CPU of this access controller.
5. method as claimed in claim 2 is characterized in that:
Priority factors=maxPri+1-PrioLevel, wherein, maxPri is a greatest priority, PrioLevel is the priority of the described access point that disposes on this access controller.
6. method as claimed in claim 2 is characterized in that:
I≥2J≥4K。
7. the method for an access point to select access controller is characterized in that, comprising:
Request message is found in access point broadcasting;
The discovery response message corresponding access control device that access point directly receives first is as the control access controller of oneself;
Wherein, described discovery response message is: after access controller receives the discovery request message of access point transmission, according to the sequence number that whether has disposed described access point on the current load condition of priority, this access controller of the described access point that disposes on this access controller and this access controller, calculated response time of delay, with described response time one timer is set, and behind described timer expiry, to the discovery response message of described access point response.
8. an access controller is characterized in that, comprising:
The first message receiver module is used to receive the discovery request message that access point sends;
The response time computing module, be used for after the described first message receiver module receives described discovery request message, according to the sequence number that whether has disposed described access point on the current load condition of priority, this access controller of the described access point that disposes on this access controller and this access controller, calculated response time of delay;
Time delay module is used for described response time one timer being set;
The first message sending module is used for behind described timer expiry, responds to described access point and finds response message, makes the discovery response message corresponding access control device that described access point directly receives first, as the control access controller of oneself.
9. access controller as claimed in claim 8 is characterized in that, described response time computing module is according to following formula calculated response time of delay:
Response time=automatic the factor * I+ load factor * J+ priority factors * K;
Wherein, when having disposed the sequence number of described access point on this access controller, the factor is 0 automatically, otherwise the factor is 1 automatically, and I, J, K are the weighted factor of time.
10. access controller as claimed in claim 9 is characterized in that:
Described load factor is the ratio of access point number with the maximum access point number that can be connected of the current connection of this access controller.
11. access controller as claimed in claim 9 is characterized in that:
Described load factor is the current utilance of the CPU of this access controller.
12. access controller as claimed in claim 9 is characterized in that:
Priority factors=maxPri+1-PrioLevel, wherein, maxPri is a greatest priority, PrioLevel is the priority of the described access point that disposes on this access controller.
13. access controller as claimed in claim 9 is characterized in that:
I≥2J≥4K。
14. an access point is characterized in that, comprising:
The second message sending module is used for broadcasting and finds request message;
The second message receiver module is used to receive the discovery response message that access device sends;
Select module, be used for directly with first discovery response message corresponding access control device that receives, as the control access controller of oneself;
Wherein, described discovery response message is: after access controller receives the discovery request message of access point transmission, according to the sequence number that whether has disposed described access point on the current load condition of priority, this access controller of the described access point that disposes on this access controller and this access controller, calculated response time of delay, with described response time one timer is set, and behind described timer expiry, to the discovery response message of described access point response.
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