CN102905343A

CN102905343A - Wireless access method and wireless access controller

Info

Publication number: CN102905343A
Application number: CN2012103825384A
Authority: CN
Inventors: 吴炳荣
Original assignee: Fujian Star Net Communication Co Ltd
Current assignee: Ruijie Networks Co Ltd
Priority date: 2012-10-10
Filing date: 2012-10-10
Publication date: 2013-01-30
Anticipated expiration: 2032-10-10
Also published as: CN102905343B

Abstract

The invention provides a wireless access method and a wireless access controller (AC), wherein the wireless access method comprises the steps of: obtaining an access request message from an access point (AP); judging whether a preset overtime stamp runs out, if so, resetting the overtime stamp and setting a total number of APs which are accessed in a current period as 1, and if not, judging whether the total number of the APs which are accessed in the current period is more than or equal to a preset threshold for the number of periodically accessed APs, if so, returning a rejection message to the AP, and if not, returning a permission message to the AP. According to the wireless access method provided by the invention, by controlling the number of APs which have been already accessed and a total number of APs which are being accessed in an access period, the APs limited by the method can be responded normally when each CAPWAP (Control And Provisioning of Wireless Access Points) channel is established, and the phenomena of disconnection and reconnection of the channel due to heavy load of a CPU (Central Processing Unit) can be avoided; therefore, the access rate of the APs is increased.

Description

Radio switch-in method and Radio Access Controller

Technical field

The present invention relates to the communication technology, relate in particular to a kind of radio switch-in method and Radio Access Controller (Access Controller is called for short AC).

Background technology

At WLAN (wireless local area network) (Wireless Local Area Networks, be called for short WLAN) thin access point (Access Point, abbreviation AP) in the framework, AP need to set up wireless access point control and supply (Controlling and Provisioning of Wireless Access Point is called for short CAPWAP) tunnel with AC.After AC issued configuration to AP, AP could normally be that radio station (Station is called for short STA) provides various services.

In present wlan network, related thousands of the AP of AC.Because AC processes the limited in one's ability of load, when a large amount of AP access AC, AC can't in time respond the CAPWAP tunnel of each AP and set up request, part AP will occur and set up CAPWAP tunnel failure phenomenon.These CAPWAP tunnel are set up failed AP and are continued repeatedly to initiate the request of setting up to AC, until access successfully, so access efficiency is low.

Summary of the invention

First aspect of the present invention provides a kind of radio switch-in method, in order to solve defective of the prior art, improves access efficiency.

Another aspect of the present invention provides a kind of AC, in order to solve defective of the prior art, improves access efficiency.

First aspect of the present invention provides a kind of radio switch-in method, may further comprise the steps:

Obtain the access request message from access point AP; Whether then what judgement was default exceeds the time limit timestamp; If describedly exceed the time limit timestamp then, the described AP sum that exceeds the time limit timestamp and the access of this cycle of resetting is set to 1; If describedly exceed the time limit timestamp not then, judge that whether the AP sum of described cycle access is more than or equal to default cycle access number threshold value; If so, return refuse information to described AP; Otherwise, return permission message to described AP, and the AP sum of described cycle access added 1.

Aforesaid method, wherein, after the described access request message of obtaining from access point AP, described judgement is default exceed the time limit timestamp whether then before, also comprise: obtain the AP sum that is accessing; Judge that whether the described AP sum that is accessing is more than or equal to default access number threshold value; If the judgment is Yes, return refuse information to described AP; If the judgment is No, carry out default whether then the step of timestamp of exceeding the time limit of described judgement; After the AP sum of judging described cycle access is not greater than or equal to default cycle access number threshold value, also comprise: the described AP sum that is accessing is added 1.

Aforesaid method, wherein, after the described access request message of obtaining from access point AP, described judgement is default exceed the time limit timestamp whether then before, also comprise: obtain the AP sum that is accessing; Judge whether the described AP sum that is accessing opens threshold value more than or equal to default function; If so, carry out default whether then the step of timestamp of exceeding the time limit of described judgement; Otherwise, return permission message and the described AP sum that is accessing added 1 to described AP.

Aforesaid method wherein, also comprises: when the upgrade request message obtained from described AP, the described AP sum that is accessing is subtracted 1; And/or, when communication tunnel corresponding to described AP disconnects, the described AP sum that is accessing is subtracted 1; And/or, when described AP enters running status, the described AP sum that is accessing is subtracted 1.

Another aspect of the present invention provides a kind of Radio Access Controller AC, comprising: receiving element is used for obtaining the access request message from access point AP; Described periodic Control unit, be used for to judge default whether then to exceed the time limit timestamp, if describedly exceed the time limit timestamp then, the AP sum that resets described exceed the time limit timestamp and this cycle are accessed is set to 1, if describedly exceed the time limit timestamp not then, open the first access control unit;

Described the first access control unit, be used for judging that whether the AP sum of described cycle access is more than or equal to default cycle access number threshold value, if, the control transmitting element returns refuse information to described AP, otherwise, the AP sum of access of described cycle is added 1 and control transmitting element and return permission message to described AP;

Described transmitting element is used for the control according to described the first access control unit, returns described refuse information or described permission message to described AP.

AC described above wherein, also comprises: the second access control unit;

Described receiving element also is used for opening described the second access control unit after obtaining from the access request message of access point AP;

Described the second access control unit is used for obtaining the AP sum that is accessing, judge that whether the described AP sum that is accessing is more than or equal to default access number threshold value, if the judgment is Yes, control described transmitting element and return refuse information to described AP, if the judgment is No, open described periodic Control unit;

Described transmitting element also is used for the control according to described the second access control unit, returns described refuse information to described AP.

Described the first access control unit also is used for after the AP sum of judging described cycle access is not greater than or equal to default cycle access number threshold value the described AP sum that is accessing being added 1.

Described the second control unit also can be used for opening the 3rd access control unit;

AC described above wherein, also comprises: the 3rd access control unit;

Described receiving element also is used for opening described the 3rd access control unit after obtaining from the access request message of access point AP;

Described the 3rd access control unit is used for obtaining the AP sum that is accessing, and judges that whether the described AP sum that is accessing opens threshold value more than or equal to default function, if so, opens described periodic Control unit; Otherwise, control described transmitting element and return permission message and the described AP sum that is accessing is added 1 to described AP;

Described transmitting element also is used for the control according to described the 3rd access control unit, returns described permission message to described AP.

AC described above wherein, also comprises:

The 4th access control unit is used for when the upgrade request message obtained from described AP the described AP sum that is accessing being subtracted 1; And/or, be used for when communication tunnel corresponding to described AP disconnects, the described AP sum that is accessing being subtracted 1; And/or, be used for when described AP enters running status, the described AP sum that is accessing being subtracted 1.

Radio switch-in method provided by the invention, by the number of controlling the AP that accesses in the access period and the AP sum that is accessing, limit the speed of AP access, guarantee by the method restriction AP after set up all CAPWAP tunnel and can both obtain normal response, the tunnel can not occur owing to the load of CPU is overweight and disconnect the phenomenon that reconnects, avoid the cpu resource of AC to be used for processing invalid CAPWAP tunnel and set up process, thereby improved the access rate of AP, guaranteed that these AP can access AC rapidly and orderly.

Description of drawings

Fig. 1 is the flow chart of the radio switch-in method of the embodiment of the invention one;

Fig. 2 is the flow chart of the radio switch-in method of the embodiment of the invention two;

Fig. 3 is the structural representation of the AC of the embodiment of the invention three;

Fig. 4 is the structural representation of the AC of the embodiment of the invention four.

Embodiment

Fig. 1 is the flow chart of the radio switch-in method of the embodiment of the invention one.As shown in Figure 1, the radio switch-in method that the present embodiment provides specifically comprises the steps:

Step 10, AC obtain the access request message from access point AP.

In the present embodiment, access request message can be datagram transmission layer safety (the Datagram Transport Layer Security of AP to the AC initiation, DTLS) handshake request message, before AP initiates handshake request message to AC, AP can initiate to find (Discovery) request message to a plurality of AC, AP starts a timer simultaneously, this timer then after, AP selects the AC of an optimum from the discovery response message of a plurality of AC of receiving, initiate the DTLS handshake request to this AC, this optimum AC is that the load capacity of the AC self that obtains in the response message that returns according to AC etc. is determined.

Whether then what step 20, AC judgement were preset exceeds the time limit timestamp.

The timestamp that exceeds the time limit just begins timing when AC starts, replace the timer mode with timestamp, reduces the cpu resource consumption of AC.

In step 20, if exceed the time limit timestamp then, execution in step 21; If exceed the time limit timestamp not then, execution in step 30.

Reset the exceed the time limit AP sum of timestamp and the access of this cycle of step 21, AC is set to 1.

In this step, the judged result in the step 20 is yes, namely exceeds the time limit timestamp then, and the AC timestamp that exceeds the time limit of resetting enter next measurement period, and the AP sum of this cycle access is set to 1.

Step 30, AC judge that whether the AP sum of this cycle access is more than or equal to default cycle access number threshold value.

In this step, this cycle access number threshold value arranges according to the ability that AC self processes load.If the determination result is NO in the step 30, order execution in

step

40,50; If the judged result in the step 30 is yes, execution in step 60.

The AP sum of access adds 1 in step 40, cycle.

In this step, the determination result is NO for step 30, and namely the AP sum of this cycle access is not greater than or equal to default cycle access number threshold value, then the AP sum that accesses in the cycle is added 1, the AP of access sum in the real-time measurement period.

Step 50, AC return permission message to AP.

In this step, the determination result is NO in the step 30, and namely the AP sum of this cycle access is less than default cycle access number threshold value, and then AC returns permission message to AP, particularly, the permission message returned to AP of AC can adopt AC to send DTLS handshake response message to AP to realize.

Particularly, AP initiates to add (Join) request message to AC after receiving the DTLS handshake response message that AC returns, and whether decision-making allows this AP access after AC receives this message that joins request.If AC allows this AP access, then return the adding response message to AC.When AP learns this AC of permission access according to the adding response message of receiving, then initiate the configuration status request message to AC.This moment, AC was configured the condition responsive processing.Then, AP initiates to change Status Enquiry Packet, and AC continues to reply change condition responsive message.Change the condition responsive message if AP receives, then enter operation (Run) state, and send first part of keep-alive message by data channel to AC.Simultaneously, AP allows to send website tool platform event WTP(Web Tools Platform, WTP to AC) the Event request message, be used for uploading self information to AC.When AC receives first part of keep-alive message that AP sends, then also enter running status, can send the configuring request message to AP.At this moment, AP successfully accesses AC, can normally provide service for STA.This is prior art, repeats no more here.

Step 60, AC return refuse information to AP.

In this step, the judged result in the step 30 is yes, and namely the AP sum of this cycle access is more than or equal to default cycle access number threshold value, and then AC returns refuse information to AP.Particularly, in the present embodiment, when AC refused the access of this AP, in order to reduce the load of self, AC did not send any refuse information to AP, and namely AC does not send DTLS handshake response message to AP; If AP does not receive the DTLS handshake response message that AC returns over time, then disconnect the tunnel, again initiate to find request message to AC.

It should be noted that, because can also being applied in other, this radio switch-in method has in the situation that a large amount of AP access simultaneously, enter simultaneously the process of upgrading such as a large amount of AP, CAPWAP tunnel all must be now through rebuliding process, can limit the AP number that enters upgrading with this radio switch-in method equally, guarantee the access that these AP can both quickly and orderly.

The radio switch-in method that the present embodiment provides, receive the DTLS handshake request message of AP at AC after, by the AP sum that accesses in the restriction access period, the AP that is no more than cycle access number threshold value is replied DTLS handshake response message, allow this AP access, otherwise refuse this AP access, because the number of the AP of access is limited in the cycle, the load disposal ability that can not surpass AC, so, AP by the method restriction after set up all CAPWAP tunnel and can both obtain normal response, the tunnel can not occur owing to the load of CPU is overweight and disconnect the phenomenon that reconnects, avoided the cpu resource of AC to be used for processing invalid CAPWAP tunnel and set up process, thereby improved the access rate of AP, guaranteed that these AP can access AC rapidly and orderly.

Fig. 2 is the flow chart of the radio switch-in method of the embodiment of the invention two.The radio switch-in method that the present embodiment provides on above-mentioned basis embodiment illustrated in fig. 1, is introduced technical scheme of the present invention in further detail.As shown in Figure 2, in the present embodiment, concrete steps are as follows:

Step 10, AC obtain the access request message from access point AP.

In the present embodiment, access request message can be the DTLS handshake request message of AP to the AC initiation, before AP initiates handshake request message to AC, AP can initiate to find request message to a plurality of AC, simultaneously AP starts a timer, this timer then after, AP selects the AC of an optimum from the discovery response message of a plurality of AC of receiving, initiate the DTLS handshake request to this AC, this optimum AC is that the load capacity of the AC self that obtains in the response message that returns according to AC etc. is determined.

Step 11, AC obtain the AP sum that is accessing, and judge that whether the AP sum that is accessing is more than or equal to default access number threshold value.

In this step, if the judged result in the step 11 is yes, execution in step 60; If the determination result is NO in the step 11, execution in step 12.

Step 60, AC return refuse information to AP.

In this step, the judged result of step 11 is yes, and the AP sum that is namely accessing is more than or equal to default access number threshold value, and then AC returns refuse information to AP.Particularly, when AC refused the access of this AP, in order to reduce the load of self, AC did not send any refuse information to AP, and namely AC does not send DTLS handshake response message to AP; If AP does not receive the DTLS handshake response message that AC returns over time, then disconnect the tunnel, again initiate to find request message to AC.

Step 12, AC obtain the AP sum that is accessing, and judge whether the described AP sum that is accessing opens threshold value more than or equal to default function.Described function is opened threshold value and is used for judging whether and need to the AP sum that access in the cycle being limited, and opens threshold value when the AP sum that is accessing is not greater than or equal to default function, does not then need to judge whether further to allow this AP access.

In this step, the determination result is NO in the step 11, the AP sum that is namely accessing is less than default access number threshold value, and then AC obtains the AP sum that is accessing, and judges whether the described AP sum that is accessing opens threshold value more than or equal to default function.

In step 12, if judged result is yes, the AP sum that is namely accessing is opened threshold value, execution in step 20 more than or equal to default function; If the determination result is NO, the AP sum that is namely accessing is opened threshold value less than default function, and then execution in step 41.

In this step, the judged result of step 12 is yes, and the AP sum that is namely accessing is opened threshold value more than or equal to default function, and whether then what then the AC judgement was default exceeds the time limit timestamp.

The described timestamp that exceeds the time limit just begins timing when AC starts, replace the timer mode with timestamp, reduces the system CPU resource consumption.

In step 20, if judged result is yes, execution in step 21, if the determination result is NO, execution in step 30.

Step 21, the exceed the time limit AP sum of timestamp and the access of this cycle of resetting are set to 1.

After step 21, execution in step 41.

Step 30, AC judge that whether the AP sum of described cycle access is more than or equal to default cycle access number threshold value.

In this step, the determination result is NO for step 20, namely exceeds the time limit timestamp not then, and then AC judges that whether the AP sum of this cycle access is more than or equal to default cycle access number threshold value.

In step 30, if judged result is yes, execution in step 60; If the determination result is NO, then order execution in step 40, step 41, step 50.

Particularly, this cycle access number threshold value arranges according to the ability that AC self processes load.

The AP sum of access adds 1 in step 40, cycle.

In this step, the determination result is NO for step 30, and namely the AP sum of this cycle access then adds 1 to the AP sum that accesses in the cycle, the AP of access sum in the real-time measurement period less than default cycle access number threshold value.

Step 41, the AP sum that is accessing add 1.

In this step, for the situation that enters step 41 after the execution in step 12, the determination result is NO owing to step 12, and the AP sum that is namely accessing is opened threshold value less than default function, the AP sum that is accessing is added 1, be used for the AP sum that real-time renewal is accessing.Situation for entering step 41 after execution in step 21 or the execution in step 40 adds 1 to the AP sum that accesses in the cycle, simultaneously the AP sum that is accessing is also added 1, the AP sum that real-time statistics is accessing.

Step 50, AC return permission message to AP.

Particularly, the permission message returned to AP of AC can adopt AC to send DTLS handshake response message to AP.

Step 60, AC return refuse information to AP.

Particularly, in the present embodiment, when refusing the access of this AP, in order to reduce the load of AC, AP does not send any refuse information to AC, and namely AC does not send DTLS handshake response message to AP; If AP does not receive the DTLS handshake response message that AC returns over time, then disconnect the tunnel, again initiate to find request message to AC.

Need to prove, when AC obtains upgrade request message from AP, the AP sum that is accessing is subtracted 1; And/or, when communication tunnel corresponding to AP disconnects, the AP sum that is accessing is subtracted 1; And/or, when AP enters running status, the AP sum that is accessing is subtracted 1.What need further specify is, AP is after receiving the DTLS response that AC returns, the possibility that causes the tunnel to disconnect owing to the AC load is overweight is very little, and the communication tunnel that above-mentioned AP is corresponding disconnects and referring to, waits the tunnel disconnection that occurs under the fortuitous event because AC or AP cut off the power supply suddenly.

Need to prove, the step 11 in above-described embodiment 2 is optional, and after step 11 executed, directly execution in step 20, and other steps are carried out in order successively.In this case, at first the AP sum that is accessing is limited, to more than or equal to the AP that accessing sum threshold value, directly refusal adds, to limiting less than further the AP in its access period being accessed of the AP sum threshold value that is accessing, can guarantee that therefore the AP number that accesses can not surpass the load disposal ability of AC.

In the present embodiment, step 12 also is optional step, and step 12 can be after step 10, carries out before the step 20, and other steps are carried out in order successively.In this case, only have when the AP sum that is accessing is opened threshold value more than or equal to function, just to the restriction of access sum in the cycle, open this AP access of permission of threshold value less than function when the AP sum that is accessing, therefore can guarantee the access AC of AP quickly and orderly.

Optionally, step 12 also can be after step 11, carries out before the step 20, in the practical application, comes optimum selecting according to the load disposal ability of AC.In Fig. 2, only be positioned at after the step 11 with step 12, be implemented as example before the step 20 and described in detail.

The radio switch-in method that the present embodiment provides, on the basis of embodiment one, not only the AP sum in the access period is limited, also the AP sum that is accessing in the whole access procedure is limited, therefore guaranteed that the access number can not surpass the load disposal ability of AC, the CAPWAP tunnel of setting up after by the DTLS handshake response can both obtain normal response, the tunnel can not occur owing to the load of CPU is overweight and disconnect the phenomenon that reconnects, avoid the cpu resource of AC to be used for processing invalid CAPWAP tunnel and set up process, thereby improved the access rate of AP, guaranteed that these AP can access AC rapidly and orderly.

Fig. 3 is the structural representation of the AC of the embodiment of the invention three.As shown in Figure 3, Radio Access Controller AC provided by the invention comprises: receiving element 301, periodic Control unit 302, the first access control unit 303, transmitting element 304.

Receiving element 301 is used for obtaining the access request message from access point AP.

Periodic Control unit 302, after AC obtains access request message from AP, to exceed the time limit timestamp whether then for what judgement was preset, timestamp then if exceed the time limit, the described AP sum that exceeds the time limit timestamp and the access of this cycle of resetting is set to 1, timestamp is not then opened the first access control unit 303 if exceed the time limit.

The first access control unit 303, be used for judging that whether the AP sum of this cycle access is more than or equal to default cycle access number threshold value, if, the first access control unit 303 control transmitting element 304 returns refuse information to AP, otherwise the first access control unit 303 adds 1 and control transmitting element 304 and return permission message to AP with the AP sum of this cycle access.

Transmitting element 304 is used for the control according to the first access control unit 303, returns refuse information or allows message to AP.

The AC that the present embodiment provides, when a large amount of AP access simultaneously, limit by the number to the AP that accesses in the predetermined period, make the load disposal ability of the access quantity adaptation AC of AP, can reduce like this possibility that AP access procedure tunnel afterwards disconnects, avoid the cpu resource of AC to set up process for the treatment of invalid CAPWAP tunnel, guaranteed the access AC of AP quickly and orderly, also improved the efficient of AC simultaneously.

Fig. 4 is the structural representation of the AC of the embodiment of the invention four.On basis embodiment illustrated in fig. 3, alternatively, described AC can also comprise the second access control unit 313, and receiving element 301 also is used for opening the second access control unit 313 after obtaining from the access request message of access point AP.The second access control unit 313 is used for obtaining the AP sum that is accessing, and judges that whether the AP sum that is accessing is more than or equal to default access number threshold value.If the judgment is Yes, the second access control unit 313 control transmitting element 304 returns refuse information to AP; If the judgment is No, periodic Control unit 302 is opened in the second access control unit 313, and whether then periodic Control unit 302 exceeds the time limit timestamp for what judgement was preset.If exceed the time limit timestamp then, reset the exceed the time limit AP sum of timestamp and the access of this cycle of periodic Control unit 302 is set to 1; If exceed the time limit timestamp not then, the first access control unit 303 is opened in periodic Control unit 302.The first access control unit 303, be used for judging that whether the AP sum of this cycle access is more than or equal to default cycle access number threshold value, if, the first access control unit 303 control transmitting element 304 returns refuse information to AP, otherwise the first access control unit 303 control transmitting elements 304 return permission message to AP.

Alternatively, described AC can also comprise the 3rd access control unit 323; Receiving element 301 also is used for opening the 3rd access control unit 323 after obtaining from the access request message of access point AP; The 3rd access control unit 323 is used for obtaining the AP sum that is accessing, and judges whether the AP sum that is accessing opens threshold value more than or equal to default function, and if so, periodic Control unit 302 is opened in the 3rd access control unit 323; Otherwise the 3rd access control unit 323 control transmitting elements 304 return the AP sum that allows message and will access to AP and add 1; Transmitting element 304 also is used for the control according to the 3rd access control unit 323, returns permission message to AP.

Further, the second access control unit 313 also is used for being judged as when no, and the AP sum that is namely accessing is not greater than or equal to default access number threshold value, opens the 3rd access control unit 323.

In the present embodiment, the AP sum that the first access control unit 303 also is used for will accessing after the AP sum of judging the access of this cycle is not greater than or equal to default cycle access number threshold value adds 1.

Further, described AC also comprises:

The 4th access control unit 333 is used for when the upgrade request message obtained from AP the AP sum that is accessing being subtracted 1; And/or, be used for when communication tunnel corresponding to AP disconnects, the AP sum that is accessing being subtracted 1; And/or, be used for when AP enters running status, the AP sum that is accessing being subtracted 1.

The AC that the present embodiment provides, when a large amount of AP access simultaneously, not only the AP sum in the access period is limited, also the AP sum that is accessing in the whole access procedure is limited, therefore guaranteed that the access sum can not surpass the load disposal ability of AC, very little by the possibility that the tunnel disconnects in access procedure of the AP after the restriction, avoided the cpu resource of AC to set up process for the treatment of invalid CAPWAP tunnel, guarantee the access AC of AP quickly and orderly, also improved the efficient of AC simultaneously.

Radio switch-in method provided by the invention and Radio Access Controller, when entering escalation process simultaneously for a large amount of AP, can use equally, enter simultaneously the AP number of upgrading by restriction, guarantee that AC can in time respond the AP interactive operation that each is being upgraded, and avoids occurring the failed phenomenon of upgrading.

It should be noted that at last: above each embodiment is not intended to limit only in order to technical scheme of the present invention to be described; Although with reference to aforementioned each embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps some or all of technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the scope of various embodiments of the present invention technical scheme.

Claims

1. a cut-in method is characterized in that, comprising:

Obtain the access request message from access point AP;

Whether then what judgement was default exceeds the time limit timestamp;

If describedly exceed the time limit timestamp then, the described AP sum that exceeds the time limit timestamp and the access of this cycle of resetting is set to 1;

If describedly exceed the time limit timestamp not then, judge that whether the AP sum of described cycle access is more than or equal to default cycle access number threshold value;

If so, return refuse information to described AP;

Otherwise, return the AP sum that allows message and described cycle accessed to described AP and add 1.

2. method according to claim 1 is characterized in that, after the described access request message of obtaining from access point AP, described judgement is default exceed the time limit timestamp whether then before, also comprise:

Obtain the AP sum that is accessing;

Judge that whether the described AP sum that is accessing is more than or equal to default access number threshold value;

If the judgment is Yes, return refuse information to described AP;

If the judgment is No, carry out default whether then the step of timestamp of exceeding the time limit of described judgement;

After the AP sum of judging described cycle access is not greater than or equal to default cycle access number threshold value, also comprise:

The described AP sum that is accessing is added 1.

3. method according to claim 1 and 2 is characterized in that, after the described access request message of obtaining from access point AP, described judgement is default exceed the time limit timestamp whether then before, also comprise:

Obtain the AP sum that is accessing;

Judge whether the described AP sum that is accessing opens threshold value more than or equal to default function;

If so, carry out default whether then the step of timestamp of exceeding the time limit of described judgement;

Otherwise, return permission message and the described AP sum that is accessing added 1 to described AP.

4. method according to claim 2 is characterized in that, also comprises:

When the upgrade request message obtained from described AP, the described AP sum that is accessing is subtracted 1;

And/or, when communication tunnel corresponding to described AP disconnects, the described AP sum that is accessing is subtracted 1;

And/or, when described AP enters running status, the described AP sum that is accessing is subtracted 1.

5. a Radio Access Controller AC is characterized in that, comprising:

Receiving element is used for obtaining the access request message from access point AP;

Described periodic Control unit, be used for to judge default whether then to exceed the time limit timestamp, if describedly exceed the time limit timestamp then, the AP sum that resets described exceed the time limit timestamp and this cycle are accessed is set to 1, if describedly exceed the time limit timestamp not then, open the first access control unit;

6. AC according to claim 5 is characterized in that, also comprises: the second access control unit;

Described transmitting element also is used for the control according to described the second access control unit, returns described refuse information to described AP;

7. according to claim 5 or 6 described AC, it is characterized in that, also comprise: the 3rd access control unit;

8. AC according to claim 6 is characterized in that, also comprises: